ANTIBODY CANCER IMMUNOTHERAPY

Abstract

a immune response against IL-13Rα2 in a subject having or at risk for developing a disease having cells expressing IL-13Rα2 includes the steps of formulating the anti-cancer vaccine outside of the subject and administering the vaccine to the subject in an amount sufficient to stimulate an immune response against IL-13Rα2 in the subject. A composition for stimulating a immune response against IL-13Rα2 in a subject having or at risk for developing a disease having cells expressing IL-13Rα2 includes an isolated agent that can stimulate immune response against IL-13α2.

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] The present application is a continuation application of U.S. patent application Ser. No. 12/020,409 filed Jan. 25, 2008, which is a divisional application of U.S. patent application Ser. No. 10/104,408 filed Mar. 22, 2002 which is a continuation-in-part of U.S. patent application Ser. No. 09/780,926 filed Feb. 8, 2001 which claims the benefit of U.S. provisional application Ser. No. 60/181,000 filed Feb. 8, 2000.

FIELD OF THE INVENTION

[0003] The invention relates generally to the fields of biology, immunology, medicine, and oncology. More particularly, the invention relates to the use of the interleukin 13 (IL-13) receptor subunit alpha 2 (IL-13Rα2) as an immune system modulator and target for vaccines for the treatment and prevention of cancer.

BACKGROUND

[0004] Cancer is presently the second leading cause of death in developed nations. Wingo et al., J. Reg. Management, 25:43-51 (1998). Despite recent research that has revealed many of the molecular mechanisms of tumorigenesis, few new treatments have achieved widespread clinical success in treating solid tumors. The mainstay treatments for most malignancies thus remain gross resection, chemotherapy, and radiotherapy. While increasingly successful, each of these treatments still causes numerous undesired side effects. The primary cause of this is that none of these conventional methods specifically targets only diseased cells. For example, surgery results in pain, traumatic injury to healthy tissue, and scarring. Radiotherapy and chemotherapy cause nausea, immune suppression, gastric ulceration and secondary tumorigenesis.

[0005] In an effort to develop techniques to more specifically target diseased cells, progress in tumor immunology has led to the discovery of antigens that are preferentially or specifically expressed on cancer cells. These tumor-associated antigens (TAA) or tumor-specific antigens (TSA) have been used as antigenic agents in cancer vaccines designed to stimulate an immune response selectively directed against cancer cells expressing such antigens. See, Tumor Immunology: Immunotherapy and Cancer Vaccines, A. G. Dalgleish and M. J. Browning, eds., Cambridge University Press, 1996; Immunotherapy in Cancer, M. Gore and P. Riches, eds., John Wiley & Son Ltd., 1996; Maeurer et al., Melanoma Res., 6:11-24 (1996). Among the most widely studied of these antigens are melanoma associated antigens, prostate specific antigen (PSA), E6 and E7, carcinoembryonic antigen (CEA), p53, and gangliosides (e.g., GM2). More recent studies have shown that certain TAAs and TSAs are particularly effective at stimulating specific immune responses.

[0006] For example, pioneering research with melanoma associated antigens led to the identification of MAGE-1 (Melanoma Antigen 1) as a T-cell activating TSA. Traversari et al., Immunogenetics, 35: 145-152, 1992. Subsequently other groups using similar techniques identified other T-cell activating melanoma antigens including other MAGEs, MART-1, glycoprotein 100 (gp100), tyrosinase, BAGE, and GAGE. Reviewed by Maeurer et al., supra. One of the most exciting recent findings in cancer immunology came after the SEREX (for serological analysis of recombinant cDNA expression libraries) technique was developed. Sahin et al., Proc. Natl. Acad. Sci. USA, 92: 11810-11813, 1995. The SEREX technique involves screening a cDNA expression library of an autologous tumor by exposing the library to antibodies contained in a patient's sera. Several active cancer antigens have been identified using this technique. See, Old, L. J. and T. C. Chen, J. Exp. Med., 187: 1163-1167, 1998. Moreover, SEREX analysis showed that patients produce a high titer of IgG antibodies against cancer antigens--a finding that indicated that helper T cells (e.g., CD4+ T cells) and B cells cooperate in stimulating an immune response against the cancer.

[0007] In addition, SEREX analyses led to the identification of a group of cancer antigens termed "cancer/testis" antigens (CTAs). CTAs share several common features including (a) among normal organs, almost exclusive expression in the testis, (b) expression in a wide variety of tumors, (c) presence of multiple members in each identified family, and (d) localization of their genes to the X chromosome (with the notable exception of SCP 1). Chen et al., J. Biol. Chem., 273: 17618-17625, 1998. Based on the foregoing criteria, several previously identified TAAs or TSAs (e.g., MAGE, BAGE and GAGE) were re-discovered as CTAs. Notably, unlike many non-CTA antigens, most of these previously identified CTAs as well as newly identified CTAs (e.g., SSX2, NY-ESO-1, SCP1 and CT7) have unequivocally been shown to stimulate an immune response in a subject.

SUMMARY

[0008] The invention relates to the discovery that IL-13Rα2 is a cancer/testis antigen. This discovery is important because, in contrast to most other cancer-associated agents, most of the cancer/testis antigens so far tested as active immunotherapy agents against cancer have proven very effective in stimulating anti-cancer immune responses in subjects. Thus, the present discovery provides methods and compositions for preventing and/or treating cancers that express IL-13Rα2.

[0009] In particular, the invention relates to the treatment and/or prevention of high-grade gliomas (HGG) in a subject as HGG cells have been shown to express high levels of IL-13Rα2 on their surfaces. Human HGG are rapidly progressing heterogeneous brain tumors of astroglial origin. The present invention is especially important because no effective modalities for treating HGG are yet accepted for clinical use. Previously, it was shown that the vast majority of HGG patients over-express a more restrictive receptor for IL-13, that is a receptor that binds IL-13 in an IL-4 independent manner. Recently, a new IL-13 binding protein, termed IL-13Rα2, was cloned. This protein was shown to have affinity for IL-13 but not IL-4. In a rough comparison, this characteristic relates to the more restrictive receptor for IL-13 expressed on HGG. Here we demonstrate that, IL-13Rα2 serves as a selective target for HGG and other cancers that express IL-R because, as described in more detail below, with the exception of testis, normal human tissue expresses little or no IL-13Rα2. And although many normal tissues express a receptor that binds IL-13, this receptor (sometimes termed the "shared" receptor because it binds both IL-13 and IL-4) differs functionally from IL-Rα2 (believed to be the "restrictive" receptor) in that the shared receptor binds both IL-13 and IL-4, while the restrictive receptor binds only IL-13. The two receptors also differ structurally, with the restrictive receptor being a 42 kDa monomer and the shared receptor being a heterodimer composed of a 45 kDa component (termed IL-13Rα1) and a 140 kDa component (termed IL-4Rα).

[0010] As indicated above, our tissue distributions studies showed that, among normal tissues, IL-13Rα2 is strongly expressed only in testis. This finding along with the showing that (a) IL-13Rα2 is preferentially over-expressed on HGG but not normal central nervous system (CNS) tissue and (b) that the IL-13Rα2 gene is localized to chromosome X, indicates that IL-13Rα2 is a CTA. Because other CTAs, such as MAGE and BAGE, have proven to stimulate a strong immune response against cancer cells (see Mintz and Debinski in Crit. Rev. Oncogen 11:77-95; 2000), the present invention provides methods and compositions useful for generating or increasing an anti-cancer immune response in a subject.

[0011] For the purpose of anti-cancer immunotherapy, IL-13Rα2 has the following distinct advantages over other cancer-related antigens. Firstly, IL-13Rα2 is a cell-surface receptor, affording it exposure to the humoral arm of the immune system. Secondly, IL-13Rα2 is expressed on the vast majority of HGGs tested, indicating its critical role in HGG progression and its potential as a target for immunotherapy. Thirdly, the physiological distribution of IL-13Rα2 is limited to cancer cells and the testes, limiting the potential for autoimmune side affects that are observed when the target is also expressed in healthy tissue. Furthermore, autoimmune side affects are unlikely because the testes are an immune-privileged organ that expresses little MHC class I molecules. Fourthly, hIL-13Rα2 is an ideal target for anti-cancer immunotherapy because of its size (380 amino acids in full length IL-13Rα2 and 343 amino acids in the extracellular domain), providing the immune system with multiple epitopes to recognize and target.

[0012] Accordingly, in one aspect the invention features a method for stimulating a immune response against IL-13Rα2 in a subject having or at risk for developing a disease having cells expressing IL-13Rα2. The method includes the steps of: (a) formulating an anti-cancer vaccine outside of the subject, the vaccine including an agent that can stimulate an immune response against IL-13Rα2 when administered to an animal; and (b) administering the vaccine to the subject in an amount sufficient to stimulate an immune response against IL-13Rα2in the subject.

[0013] In another aspect the invention features a composition for stimulating an immune response against IL-13Rα2 when administered to an animal. The composition includes: (a) an isolated agent that can stimulate an immune response against IL-13Rα2 when administered to an animal; and (b) a pharmaceutically acceptable carrier.

[0014] In both of the foregoing method and composition, the agent that can stimulate an immune response against IL-13Rα2 can include a peptide including at least seven contiguous amino acids of SEQ ID NO:1. For example, the agent can be a protein including the amino acid sequence of SEQ ID NO:1. The agent can also take the form of a nucleic acid that encodes a peptide including at least seven contiguous amino acids of SEQ ID NO:1. Such a nucleic acid can be used as a naked DNA or in an expression vector construct including the nucleic acid. The agent that can stimulate an immune response against IL-13Rα2 can also be a cell. This cell can be one that expresses a peptide including at least seven contiguous amino acids of SEQ ID NO:1, or one into which a purified nucleic acid that encodes a peptide including at least seven contiguous amino acids of SEQ ID NO:1 has been introduced.

[0015] The vaccines and compositions within the invention can further include an adjuvant such as an aluminum salt; an oil-in-water emulsion; a composition including saponin; a composition including a bacterial protein; or a cytokine.

[0016] The method of the invention can further include a step of providing a subject (e.g., a human being) having or at risk for developing a cancer having cells expressing IL-13Rα2 e.g., glioma cells). Also in the method, the step of administering the vaccine to the subject in an amount sufficient to stimulate an immune response against IL-13Rα2 in the subject can include administering the vaccine in at least a first dose and a second dose, wherein the first dose is administered to the subject at least 24 hours before the second dose is administered to the subject.

[0017] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Definitions of molecular biology terms can be found, for example, in Rieger et al., Glossary of Genetics: Classical and Molecular, 5th edition, Springer-Verlag: New York, 1991; and Lewin, Genes V, Oxford University Press: New York, 1994. Standard one-letter nomenclature for nucleotide bases, and one- and three-letter nomenclature for amino acid residues are used.

[0018] As used herein, a "nucleic acid" means a chain of two or more nucleotides. For example, RNA (ribonucleic acid) and DNA (deoxyribonucleic acid) are nucleic acids. An "isolated" nucleic acid is one that has been substantially separated or purified away from other nucleic acid sequences in the cell of the organism in which the nucleic acid naturally occurs, i.e., other chromosomal and extrachromosomal DNA and RNA, e.g., by conventional nucleic acid purification methods. The term therefore includes a recombinant nucleic acid molecule incorporated into a vector, into an autonomously replicating plasmid or virus, or into the genomic DNA of a prokaryote or eukaryote. It includes a separate molecule such as a cDNA, a genomic fragment, a fragment produced by polymerase chain reaction (PCR), or a restriction fragment. It also includes recombinant nucleic acid molecules and chemically synthesized nucleic acid molecules. A "recombinant" nucleic acid molecule is one made by an artificial combination of two otherwise separated segments of sequence, e.g., by chemical synthesis or by the manipulation of isolated segments of nucleic acids by genetic engineering techniques.

[0019] When referring to a nucleic acid molecule or polypeptide, the term "native" refers to a naturally-occurring (e.g., a "wild-type") nucleic acid or polypeptide. A "homolog" of an IL-13Rα2 gene is a gene sequence encoding an IL-13Rα2 polypeptide isolated from a species other than Homo sapiens. By the phrase "naked nucleic acid" is meant an isolated nucleic acid not incorporated in an expression vector.

[0020] By the terms "IL-13Rα2 gene" or "IL-13Rα2 polynucleotide" is meant a native IL-13Rα2 encoding nucleic acid sequence (e.g., the IL-13Rα2 cDNA sequence shown as SEQ ID NO: 2 (FIG. 2)), genomic sequences from which IL-13Rα2 cDNA can be transcribed, and/or allelic variants and homologs of the foregoing.

[0021] As used herein, "protein," "peptide," or "polypeptide" means any peptide-linked chain of amino acids, regardless of length or post-translational modification, e.g., glycosylation or phosphorylation. Generally, the term "peptide" is used herein to refer to amino acid chains less than about 25 amino acid residues in length, while the terms "protein" and "polypeptide" are used to refer to larger amino acid chains. When referring to a protein or peptide, the term "isolated" means proteins or peptides that are isolated from other cellular proteins or are made synthetically. The term thus encompasses both purified and recombinant polypeptides. The term "recombinant protein" or "recombinant peptide" refers to a protein or peptide that is produced by recombinant nucleic acid techniques, wherein generally, a nucleic acid encoding the peptide or protein is inserted into a suitable expression vector which is in turn used to transform a host cell such that, when cultured under appropriate conditions, the cell produces the peptide or protein.

[0022] By "IL-13Rα2 protein" "IL-13Rα2 polypeptide," or simply "IL-13Rα2" is meant an expression product of an IL-13Rα2 gene such as the protein of SEQ ID NO:1 (FIG. 1); or a protein that shares at least 65% (but preferably 75, 80, 85, 90 , 95, 96, 97 ,98, or 99%) amino acid sequence identity with SEQ ID NO:1 and cross-reacts with antibodies that specifically bind the protein of SEQ ID NO:1.

[0023] As used herein, "sequence identity" means the percentage of identical subunits at corresponding positions in two sequences when the two sequences are aligned to maximize subunit matching, i.e., taking into account gaps and insertions. When a subunit position in both of the two sequences is occupied by the same monomeric subunit, e.g., if a given position is occupied by an adenine in each of two DNA molecules, then the molecules are identical at that position. For example, if 7 positions in a sequence 10 nucleotides in length are identical to the corresponding positions in a second 10-nucleotide sequence, then the two sequences have 70% sequence identity. Preferably, the length of the compared sequences is at least 60 nucleotides, more preferably at least 75 nucleotides, and most preferably 100 nucleotides. Sequence identity is typically measured using sequence analysis software (e.g., Sequence Analysis Software Package of the Genetics Computer Group, University of Wisconsin Biotechnology Center, 1710 University Avenue, Madison, Wis. 53705).

[0024] A first nucleic-acid sequence is "operably" linked with a second nucleic-acid sequence when the first nucleic-acid sequence is placed in a functional relationship with the second nucleic-acid sequence. For instance, a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence. Generally, operably linked DNA sequences are contiguous and, where necessary to join two protein coding regions, in reading frame.

[0025] As used herein, the term "vector" refers to a nucleic acid molecule capable of transporting another nucleic acid to which it has been linked. A vector capable of directing the expression of a gene to which it is operatively linked is referred to herein as an "expression vector." As used herein, the term "promoter" means a nucleic acid sequence that regulates expression of a selected nucleic acid sequence operably linked to the promoter, and which effects expression of the selected nucleic acid sequence in cells. The term encompasses "tissue specific" promoters, i.e. promoters, which effect expression of the selected nucleic acid sequence only in specific cells (e.g. cells of a specific tissue). The term also covers so-called "leaky" promoters, which regulate expression of a selected nucleic acid primarily in one tissue, but cause expression in other tissues as well. The term also encompasses both non-tissue specific promoters and promoters that are constitutively active and inducible.

[0026] By the phrase "stimulating an immune response" is meant eliciting or increasing the activation of a lymphocyte (e.g., a B cell or T cell) or other immune system component. The stimulation of an immune response against a specific antigen can be measured as an increase in antibody titer against that antigen or the activation of one or more lymphocytes having a surface receptor specific for the antigen. Activation of lymphocytes can be determined by conventional assays, e.g., the induction of mitosis, secretion of cytokines, modulation of cell surface molecule expression, secretion of immunoglobulin (B cells), and increased killing of target cells (cytotoxic T cells).

[0027] As used herein, "bind," "binds," or "interacts with" means that one molecule recognizes and adheres to a particular second molecule in a sample, but does not substantially recognize or adhere to other structurally unrelated molecules in the sample. Generally, a first molecule that "specifically binds" a second molecule has a binding affinity greater than about 10⁵ to 10⁶ liters/mole for that second molecule.

[0028] By the term "antibody" is meant any antigen-binding peptide derived from an immunoglobulin. The term includes polyclonal antisera, monoclonal antibodies, fragments of immunoglobulins produced by enzymatic digestion (e.g., Fab fragments) or genetic engineering (e.g., sFv fragments).

[0029] Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In the case of conflict, the present specification, including definitions will control. In addition, the particular embodiments discussed below are illustrative only and not intended to be limiting.

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The invention is pointed out with particularity in the appended claims. The above and further advantages of this invention may be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which:

[0031] FIG. 1 is the amino acid sequence of the native H. sapiens IL-13Rα2 protein. FIG. 2 is the nucleic acid sequence of a cDNA corresponding to a native mRNA encoding the native H. sapiens IL-13Rα2 protein.

[0032] FIG. 3 is a schematic representation of two types of IL13 receptors: the shared with IL4 physiological, heterodimeric IL13/4R, and an IL4-independent monomeric, HGG-associated IL13R. A, 140-kDa IL4R α-chain. B, 45-kDa IL13R α1-chain; A and B constitute the elements of the heterodimeric high affinity IL13/4R. C, a 42-kDa monomer of IL13Rα2.

[0033] FIG. 4 is a Northern blot analysis of human IL13Rα2 transcripts (closed figure) in series of CNS (panels I and II) and peripheral tissues (panels III and IV). The migration position of mRNA is shown in kilobases. Films were exposed for 2 weeks.

[0034] FIG. 5 is a Northern blot analysis of human IL13Rα2 transcripts (closed figure) in series of CNS (panels I and II) and peripheral tissues (panels III and IV). The migration position of mRNA is shown in kilobases. Films were exposed for 2 weeks except for membranes shown in panels III and IV, which were exposed for 3 days.

[0035] FIG. 6 is a Northern blot analysis of human 140-kDa IL4R α-chain transcripts (closed figure) in series of CNS (panels I and II) and peripheral tissues (panel IV). The migration position of mRNA is shown in kilobases. Films were exposed for 2 weeks.

[0036] FIG. 7 is a Northern blot analysis of human β-actin transcripts in CNS (panels I and II) and peripheral tissues (panel IV). The migration position of mRNA is shown in kilobases. Films were exposed for 1-3 hours.

[0037] FIG. 8 is a Northern blot analysis of transcripts of different IL13 receptors in malignant glioma cells (G-48, A-172 MG, U-373 MG, and U-251 MG), normal human umbilical vein endothelial cells (HUVEC) and in surgical specimens of GBM and normal human brain. The migration position of mRNA is shown in kilobases. Films were exposed for 2 weeks, except for actin (1 hr).

[0038] FIG. 9 is two graphs showing the effectiveness of an hIL13Rα2 recombinant protein vaccine (A) and a nucleic acid vaccine (B) in preventing tumor formation in an animal model.

DETAILED DESCRIPTION

[0039] The invention encompasses compositions and methods relating to stimulating an immune response against IL-13RA2 in a subject having or being at risk for developing a cancer or other disease having cells expressing IL-13Rα2. The below described preferred embodiments illustrate adaptations of these compositions and methods. Nonetheless, from the description of these embodiments, other aspects of the invention can be made and/or practiced based on the description provided below.

Biological Methods

[0040] Methods involving conventional molecular biology techniques are described herein. Such techniques are generally known in the art and are described in detail in methodology treatises such as Molecular Cloning: A Laboratory Manual, 2nd ed., vol. 1-3, ed. Sambrook et al., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989; and Current Protocols in Molecular Biology, ed. Ausubel et al., Greene Publishing and Wiley-Interscience, New York, 1992 (with periodic updates). Methods for chemical synthesis of nucleic acids are discussed, for example, in Beaucage and Carruthers, Tetra. Letts. 22:1859-1862, 1981, and Matteucci et al., J. Am. Chem. Soc. 103:3185, 1981. Chemical synthesis of nucleic acids can be performed, for example, on commercial automated oligonucleotide synthesizers. Immunological methods (e.g., preparation of antigen-specific antibodies, immunoprecipitation, and immunoblotting) are described, e.g., in Current Protocols in Immunology, ed. Coligan et al., John Wiley & Sons, New York, 1991; and Methods of Immunological Analysis, ed. Masseyeff et al., John Wiley & Sons, New York, 1992. Conventional methods of gene transfer and gene therapy can also be adapted for use in the present invention. See, e.g., Gene Therapy: Principles and Applications, ed. T. Blackenstein, Springer Verlag, 1999; Gene Therapy Protocols (Methods in Molecular Medicine), ed. P. D. Robbins, Humana Press, 1997; and Retro-vectors for Human Gene Therapy, ed. C. P. Hodgson, Springer Verlag, 1996.

Identification of IL-13Rα2 as a Cancer/Testis Antigen

[0041] As its name implies, IL-13Rα2 is a receptor for the lymphokine IL-13. IL-13 has been identified as a homologue of IL-4 that is secreted by both B and T cells. Minty et al., Nature, 36: 248-251, 1993; McKenzie et al., Proc. Natl. Acad. Sci. USA, 90: 3735-3739, 1993. Several types of normal cells contain an IL-13 receptor termed the shared IL-13/IL-4 receptor, which is a heterodimer that includes an IL-13 binding subcomponent named IL-13Rα1 (Interleukin 13 receptor alpha one). Hilton et al., Proc. Natl. Acad. Sci. USA, 93: 497-501, 1996; Aman et al., J. Biol. Chem., 271: 29265-29270, 1996; Miloux et al., FEBS Letters, 40: 163-166, 1997. In addition to IL-13Rα1, the shared receptor also includes a protein referred to as p140 (or IL-4Rα), the subcomponent responsible for IL-4 binding. Idzerda et al., J. Exp. Med., 171: 861-873, 1990; Hilton et al., Proc. Natl. Acad. Sci. USA, 93: 497-501, 1996; Debinski et al., Nature Biotech., 16: 449-453, 1995; Zurawski et al., EMBO J., 12: 2663-2670, 1993; Minty et al., Nature, 36: 248-251, 1993. Exposing cells to IL-13 results in responses very similar to those responses that occur after exposure to IL-4. Zurawski, G., and J. E. de Vries, Stem Cells. 12: 169-174, 1994. Examples of cellular responses resulting from both IL-13 and IL-4 exposure include enhanced expression of CD72, IgM, and MHC class II antigen, as well as induced CD23 expression and IgE heavy-chain gene production in B lymphocytes. Id.

[0042] In an interesting development, it was found that IL-13Rα1 was not the only IL-13 binding site that existed on cells. In previous studies, it was demonstrated that many cancers, most notably HGG, are capable of binding IL-13. Debinski et al., Clin. Cancer Res., 1:1253-1258, 1995; Debinski et al., J. Biol. Chem., 271: 22428-22433, 1996; Debinski et al., Nature Biotech., 16: 449-453, 1998; Debinski et al., Critic Rev. Oncogen., 9: 256-268, 1998; Debinski et al., Clin. Cancer Res., 5: 985-990, 1999. Through these studies, it became increasingly clear that the IL-13 binding capacity of many of these tumors was not mediated through the shared IL-13/IL-4 receptor (i.e., the receptor now known to be a heterodimer composed of IL-13Rα1/p140). Notably, in lymphoid cells that contain the shared receptor, saturating the receptors with IL-4 blocked IL-13 binding. Zurawski et al., EMBO J., 12: 2663-2670, 1993. This was not the case using HGG cells, where IL-13 binding was unaltered even where a large excess of IL-4 used in neutralization assays. Debinski et al., Clin. Research Res., 1: 1253-1258, 1995; Debinski et al., J. Biol. Chem., 271: 22428-22433, 1996; Debinski et al., Nature Biotech., 16: 449-453, 1998. In further experiments, rationally designed IL-13 mutants were generated that maintained their ability to bind glioblastoma (HGG) cells but lost their ability to interact and cause signaling in cells expressing only the IL-4/IL-13 shared receptor. Debinski et al., Nature Biotech., 16: 449-453, 1998; Thompson, J. P. and W. Debinski, J. Biol. Chem., 274: 29944-29950, 1999; Debinski, W., and J. P. Thompson, Clin. Cancer Res., 5: 3143s-3147s, 1999. This evidence supported the existence of an additional IL-13 binding protein, unrelated to known IL-4 binding proteins. Additional evidence was derived when a novel IL-13 binding protein on cells of renal cell carcinoma metastases (Caki-1 cells) was isolated and the gene encoding the protein cloned. Caput et al., J. Biol. Chem., 271:16921, 1996. The gene encoding this protein, termed IL-13Rα2, was subsequently cloned and sequenced. Id. This novel IL-13 binding protein, referred to herein as IL-13Rα2, was shown not to specifically bind IL-4. The proposed structures of the shared IL-13/4 receptor and the IL-4-independent receptor for IL-13 are shown in FIG. 3.

[0043] To investigate whether this newly discovered receptor is present in HGG, we evaluated its gene expression in HGG established cell lines, and HGG explant cells and tumor specimens. In addition to these studies on HGG, we screened a plethora of normal central nervous system (CNS) tissues and peripheral organs for the mRNA transcripts of IL-13Rα2 in order to characterize the normal tissue expression pattern of this new receptor in detail. From these studies, we discovered that IL-13Rα2 expression is virtually absent in all normal adult tissue except testis. In earlier studies, the gene encoding IL-13Rα2 was localized to the X chromosome. Guo et al., Genomics, 42: 141-145, 1997.

[0044] Accordingly, our discovery allowed us to characterize the IL-13Rα2 protein as a member of the CTA group of tumor antigens. Moreover, because IL-13Rα2 is a transmembrane receptor, it is exposed to the extracellular environment independently of MHC presentation. Thus, in contrast to intracellular antigens that must be displayed as a peptide fragment in complex with an MHC molecule on the cell surface to be recognized by immune system components, cytotoxic agents or antibodies can be directly targeted to cancer cells bearing IL-13Rα2 on their surface. This discovery that IL-13Rα2 is a CTA associated with HGG is significant because no other HGG-associated antigens of this prevalence are known that could serve as a basis for a rational design of anti-glioma vaccines.

Vaccines

[0045] The invention provides vaccines that can stimulate an immune response against IL-13Rα2 in a subject when administered to the subject. Vaccines within the invention include an antigenic agent which can take the form of any substance that can evoke or increase an immune response against IL-13Rα2 when introduced into a subject. Typical immune responses include (a) the production of, or increase in titer of, antibodies that specifically bind IL-13Rα2 and (b) the activation of T lymphocytes (e.g., to kill a target cell or provide help in the activation of antibody production in B lymphocytes). A number of different antigenic agents have been shown to be effective in stimulating an immune response against a protein antigen, including, for example, protein- and peptide-based vaccines, tumor-cell vaccines, dendritic cell/gene therapy vaccines and DNA/viral vaccines. See, e.g., Greten, T. F. and E. M. Jaffee, J. Clin. Oncol., 17: 1047-1060, 1999. In addition to the foregoing, various substances such as adjuvants and excipients/carriers can be included in the vaccine compositions of the invention to non-specifically enhance the antigen-specific immune response stimulated by the antigenic agent and to facilitate delivery of the other components of the vaccine to a subject.

Protein/Peptide Based Vaccines

[0046] The antigenic agent for use in the vaccines of the invention can take the form of the native IL-13Rα2 (SEQ ID NO:1) or a peptide fragment of IL-13Rα2. Vaccines made with the whole protein antigen are advantageous because they have the capability of stimulating an immune response against all of the potential antigenic sites expressed by the protein. Vaccines made with peptide antigens (e.g., 7-15 or 8-12 contiguous amino acids of the whole protein), on the other hand, will generally stimulate an immune response against fewer than all of the potential antigenic sites expressed by the protein. Peptide-based vaccines are sometimes advantageous over whole protein-based vaccines where it is desired to more specifically target the stimulated immune response, e.g., to avoid undesired cross reactions. For example, peptides for use in the vaccine can be selected to correspond to (1) specific epitopes of the antigens that are known to be presented by MHC class I or MHC class II molecules, or (2) a modified form of an epitope that either exhibits an increased stability in vivo or a higher binding affinity for an MHC molecule than the native epitope, while still being capable of specific activation of T-cells. See, Ayyoub et al., J. Biol. Chem., 274: 10227-10234, 1999; Parkhurst et al., Immunol., 157: 2539-2548, 1996. Peptide-based vaccines have been shown to circumvent immune tolerance to the intact proteins. Disis et al., J. Immunol., 156: 3151-3158, 1996. In addition to vaccines composed of only one type of peptide fragment, other vaccines within the invention also include those made up of a cocktail of several different peptides derived from IL-13Rα2.

[0047] As indicated above, vaccines with in the invention can include an IL-13Rα2 protein as an antigenic agent. Preferred forms of IL-13Rα2 protein include a purified native IL-13Rα2 protein that has the amino acid sequence shown in FIG. 1 (SEQ ID NO:1). Variants of the native IL-13Rα2 protein such as fragments, analogs and derivatives of native IL-13Rα2 are also contemplated for use as an antigenic agent in the vaccines of the invention. Such variants include, e.g., a polypeptide encoded by a naturally occurring allelic variant of the native IL-13Rα2 gene, a polypeptide encoded by a homolog of the native IL-13Rα2 gene, and a polypeptide encoded by a non-naturally occurring variant of the native IL-13Rα2 gene. Preferred versions of such variants are those that are able to stimulate an immune response to native IL-13Rα2 upon administration to a subject as part of a vaccine.

[0048] IL-13Rα2 protein variants have a peptide sequence that differs from the native IL-13Rα2 protein in one or more amino acids. The peptide sequence of such variants can feature a deletion, addition, or substitution of one or more amino acids of the native IL-13Rα2 polypeptide. Amino acid insertions are preferably of about 1 to 4 contiguous amino acids, and deletions are preferably of about 1 to 10 contiguous amino acids. In some applications, variant IL-13Rα2 proteins substantially maintain a native IL-13Rα2 protein functional activity (e.g., the ability to specifically bind IL-13). For other applications, variant IL-13Rα2 proteins lack or feature a significant reduction in an IL-13Rα2 protein functional activity. Where it is desired to retain a functional activity of native IL-13Rα2 protein, preferred IL-13Rα2 protein variants can be made by expressing nucleic acid molecules within the invention that feature silent or conservative changes. Variant IL-13Rα2 proteins with substantial changes in functional activity can be made by expressing nucleic acid molecules within the invention that feature less than conservative changes.

[0049] IL-13Rα2 protein fragments corresponding to one or more particular motifs (e.g., those likely to bind with high affinity to MHC molecules) and/or domains are within the invention as are those of arbitrary sizes. For example, peptide fragments of IL-13Rα2 protein consisting of at least 5, 10, 25, 30, 40, 50, 50, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 300 or more contiguous amino acids of the IL-13Rα2 protein are within the scope of the present invention. Fragments of between 7 and 15 amino acids (preferably 8-12 amino acids) in length (e.g., those sized to fit in the grooves of MHC molecules) are preferred as peptides of such size have been shown to serve as efficient immunogenic agents. Methods for identifying efficiently immunogenic peptides of a whole protein are known in the art, e.g., using amphipathicity algorithms. See, e.g., Berzofsky, J. A., Ann. N.Y. Acad. Sci., 12:256, 1993; U.S. Pat. Nos. 5,976,541 and 5,980,899. Peptides that are most immunogenic in a subject can also be determined by preparing a series of overlapping peptide fragments (e.g., 7-30 amino contiguous amino acids long) of the whole antigen, administering the subject (or a series of genetically similar such subjects) such fragments in a vaccine composition, and analyzing the subject(s) for the stimulation of an immune response. Those peptide fragments that induce the desired response can then be selected.

[0050] Isolated peptidyl portions of IL-13Rα2 proteins can be obtained by screening peptides recombinantly produced from the corresponding fragment of the nucleic acid encoding such peptides. In addition, fragments can be chemically synthesized using techniques known in the art such as conventional Merrifield solid phase f-Moc or t-Boc chemistry. For example, similar to the technique described above, an IL-13Rα2 protein of the present invention may be arbitrarily divided into fragments of desired length with no overlap of the fragments, or preferably divided into overlapping fragments of a desired length. The fragments can be produced (recombinantly or by chemical synthesis) and tested to identify those peptidyl fragments which can function antigenic agents that stimulate an immune response against an IL-13Rα2 protein.

[0051] Another aspect of the present invention concerns recombinant forms of the IL-13Rα2 proteins. Recombinant polypeptides preferred for use in the present invention, in addition to native IL-13Rα2 protein, are encoded by a nucleic acid that has at least 85% sequence identity (e.g., 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100%) with the nucleic acid sequence of SEQ ID NO:2. In a preferred embodiment, variant IL-13Rα2 have the ability to stimulate an immune response against the native IL-13Rα2 protein.

[0052] IL-13Rα2 protein variants can be generated through various techniques known in the art. For example, IL-13Rα2 protein variants can be made by mutagenesis, such as by introducing discrete point mutation(s), or by truncation. Mutation can give rise to an IL-13Rα2 protein variant having more, substantially the same, or merely a subset of the antigenic activity of the native IL-13Rα2 protein. Other variants of IL-13Rα2 that can be generated include those that are resistant or more susceptible to proteolytic cleavage, as for example, due to mutations which alter protease target sequences. Whether a change in the amino acid sequence of a peptide results in a IL-13Rα2 protein variant having greater or lesser antigenic activity than native IL-13Rα2 protein can be readily determined by comparing the variant with the native IL-13Rα2 protein for the ability to stimulate an immune response against IL-13Rα2 in subjects vaccinated with the respective proteins.

[0053] As another example, IL-13Rα2 protein variants can be generated from a degenerate oligonucleotide sequence. Chemical synthesis of a degenerate gene sequence can be carried out in an automatic DNA synthesizer, and the synthetic genes then ligated into an appropriate expression vector. The purpose of a degenerate set of genes is to provide, in one mixture, all of the sequences encoding the desired set of potential IL-13Rα2 protein sequences. The synthesis of degenerate oligonucleotides is well known in the art (see for example, Narang, SA (1983) Tetrahedron 39:3; Itakura et al. (1981) Recombinant DNA, Proc. 3rd Cleveland Sympos. Macromolecules, ed. A G Walton, Amsterdam: Elsevier pp 273-289; Itakura et al. (1984) Annu. Rev. Biochem. 53:323; Itakura et al. (1984) Science 198:1056; Ike et al. (1983) Nucleic Acid Res. 11:477. Such techniques have been employed in the directed evolution of other proteins (see, for example, Scott et al. (1990) Science 249:386-390; Roberts et al. (1992) Proc. Natl. Acad. Sci. USA 89:2429-2433; Devlin et al. (1990) Science 249: 404-406; Cwirla et al. (1990) Proc. Natl. Acad. Sci. USA 87: 6378-6382; as well as U.S. Pat. Nos. 5,223,409; 5,198,346; and 5,096,815). Similarly, a library of coding sequence fragments can be provided for an IL-13Rα2 gene clone in order to generate a variegated population of IL-13Rα2 protein fragments for screening and subsequent selection of fragments having the ability to stimulate an immune response against IL-13Rα2 in a subject. A variety of techniques are known in the art for generating such libraries, including chemical synthesis. In one embodiment, a library of coding sequence fragments can be generated by (i) treating a double-stranded PCR fragment of an IL-13Rα2 gene coding sequence with a nuclease under conditions wherein nicking occurs only about once per molecule; (ii) denaturing the double-stranded DNA; (iii) renaturing the DNA to form double-stranded DNA which can include sense/antisense pairs from different nicked products; (iv) removing single-stranded portions from reformed duplexes by treatment with S1 nuclease; and (v) ligating the resulting fragment library into an expression vector. By this exemplary method, an expression library can be derived which codes for N-terminal, C-terminal and internal fragments of various sizes. The invention also provides for reduction of IL-13Rα2 proteins to generate mimetics, e.g. peptide or non-peptide agents, that are able to stimulate an immune response against IL-13Rα2 in a subject. For instance, non-hydrolyzable peptide analogs of the amino acid residues of IL-13Rα2 proteins and peptides thereof can be generated using benzodiazepine (e.g., see Freidinger et al. in Peptides: Chemistry and Biology, G. R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), azepine (e.g., see Huffman et al. in Peptides: Chemistry and Biology, G. R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), substituted gamma lactam rings (Garvey et al. in Peptides: Chemistry and Biology, G. R. Marshall ed., ESCOM Publisher: Leiden, Netherlands, 1988), keto-methylene pseudopeptides (Ewenson et al. (1986) J. Med. Chem. 29:295; and Ewenson et al. in Peptides: Structure and Function (Proceedings of the 9th American Peptide Symposium) Pierce Chemical Co. Rockland, Ill., 1985), eta-turn dipeptide cores (Nagai et al. (1985) Tetrahedron Lett 26:647; and Sato et al. (1986) J. Chem. Soc. Perkin. Trans. 1:1231), and b-aminoalcohols (Gordon et al. (1985) Biochem. Biophys. Res. Commun. 126:419; and Dann et al. (1986) Biochem. Biophys. Res. Commun. 134:71). IL-13Rα2 proteins may also be chemically modified to create IL-13Rα2 derivatives by forming covalent or aggregate conjugates with other chemical moieties, such as glycosyl groups, lipids, phosphate, acetyl groups and the like. Covalent derivatives of IL-13Rα2 proteins or peptides can be prepared by linking the chemical moieties to functional groups on amino acid side chains of the protein/peptide or at the N-terminus or at the C-terminus of the protein/peptide.

[0054] IL-13Rα2 proteins may also be fused to one or more other proteins. For example, an IL-13Rα2 protein or immunogenic portion thereof may be fused to another protein that serves as a targeting ligand to deliver the IL-13Rα2 protein or portion to a particular target site in a subject (e.g., in order to stimulate a local immune response at that site). For instance, an IL-13Rα2 protein or peptide can be fused to a mutant IL-13 molecule or anti-IL-13 receptor antibody to specifically target the IL-13Rα2 protein or peptide to a tumor, e.g., a HGG.

[0055] Numerous methods of fusing two or more proteins together are known in the art, e.g., making and expressing a recombinant fusion construct, or using a cross-linking agent to covalently bond the two or more proteins together to form one molecule. Any suitable for this application might be used in the invention. The IL-13Rα2 proteins and peptides of the invention can be made by known methods. For example, a host cell transfected with a nucleic acid vector directing expression of a nucleotide sequence encoding the subject proteins or peptides can be cultured under appropriate conditions to allow expression of the peptide to occur. The cells may be harvested, lysed, and the protein isolated. A recombinant IL-13Rα2 protein or peptide can be isolated from host cells using techniques known in the art for purifying proteins including ion-exchange chromatography, gel filtration chromatography, ultrafiltration, electrophoresis, and immunoaffinity purification with antibodies specific for such protein or peptide.

[0056] For example, after an IL-13Rα2 protein or peptide has been expressed in a cell, it can be isolated using immuno-affinity chromatography. For instance, an anti-IL-13Rα2 antibody that specifically binds the subject proteins or peptides can be immobilized on a column chromatography matrix, and the matrix can be used for immuno-affinity chromatography to purify the proteins or peptides from cell lysates by standard methods (see, e.g., Ausubel et al., supra). After immuno-affinity chromatography, the proteins or peptides can be further purified by other standard techniques, e.g., high performance liquid chromatography (see, e.g., Fisher, Laboratory Techniques In Biochemistry And Molecular Biology, Work and Burdon, eds., Elsevier, 1980). In another embodiment, the IL-13Rα2 proteins or peptides utilized in the invention are expressed as a fusion protein containing an affinity tag (e.g., GST) that facilitates its purification.

[0057] In association with an antigenic agent (e.g., a IL-13Rα2 protein or peptide fragment thereof) of a vaccine of the invention, an adjuvant can be used to boost the immune response. Suitable adjuvants for use in the invention can include any substance that can non-specifically enhance an antigen-specific immune response stimulated by an antigenic agent. Many such adjuvants are known, including for example: (1) Freund's adjuvant (complete and incomplete) (2) oil-in-water emulsion formulations such as the Ribi® adjuvant system (Corixa, Seattle, Wash.) (3) aluminum salts (e.g., aluminum hydroxide, aluminum phosphate, aluminum sulfate, etc); (4) saponin-based adjuvants (Stimulon® from Aquila Biosciences, Framingham, Mass.); (5) cytokines such as IL-1, IL-2, macrophage colony stimulating factor, and tumor necrosis factor; and (6) other substances that act as immunostimulating agents such as muramyl peptides or bacterial cell wall components, toxins, and toxoids.

[0058] To facilitate their formulation for administration to a subject, the vaccine compositions of the invention (e.g., the protein/peptide antigen and adjuvant) can further contain a pharmaceutically acceptable carrier or excipient. For example the protein/peptide antigen and adjuvant can be mixed with a diluent such as water, saline, glycerol, ethanol, etc. Other substances, such as preservatives, surfactants, emulsifying agents, buffers, etc. can also be included. Typically, the protein/peptide-based vaccine compositions of the invention are prepared for parenteral injection as liquid solutions or suspensions. The vaccine compositions can also be prepared as solids (e.g., a lyophilized powder) that can be reconstituted in a liquid (e.g., saline) prior to injection into a subject. The vaccine compositions can also be emulsified or encapsulated in liposomes.

Nucleic Acid-Based Vaccines

[0059] Nucleic acid-based vaccines are known to elicit a prominent cell-mediated immune response. See, e.g., Donnely et al., 1997; Rosenberg, S. A., Immunity 10:281, 1999. Thus, in addition to protein/peptide based vaccines, the antigenic agent for use in the vaccines of the invention can take the form of a nucleic acid that can stimulate an immune response against IL-13Rα2 when administered to a subject. Examples of such nucleic acids include those that encode the native IL-13Rα2 such as the nucleic acid shown herein as SEQ ID NO:2 (FIG. 2), a variant of the native IL-13Rα2, or a peptide fragment of that native or variant IL-13Rα2. Vaccines made with a nucleic acid that encodes the whole protein antigen are advantageous because they have the potential for stimulating an immune response against all of the different antigenic sites expressed by the protein. Vaccines made with a nucleic acid that encodes a peptide antigen (e.g., 7-15 amino acids of the whole protein), on the other hand, will generally stimulate an immune response against fewer than all of the potential antigenic sites expressed by the protein.

[0060] The form of the nucleic acid used in a vaccine of the invention can be any suitable for stimulating an immune response against IL-13Rα2 when administered to a subject. For example, the nucleic acid can be in the form of "naked DNA" or it can be incorporated in an expression vector. A description of suitable nucleic acids is presented below. Nucleic acids that are most immunogenic in a subject can be determined by preparing several of the below listed nucleic acids (e.g., those that encode the whole antigen or peptide fragments thereof), administering the subject (or a series of genetically similar such subjects) such nucleic acids in a vaccine composition (e.g., as naked nucleic acid or in an expression vector in a suitable carrier), and analyzing the subject(s) for the stimulation of an immune response. Those nucleic acids that induce the desired response can then be selected.

[0061] Nucleic acid molecules utilized in the present invention as an antigenic agent may be in the form of RNA or in the form of DNA (e.g., cDNA, genomic DNA, and synthetic DNA). The DNA may be double-stranded or single-stranded, and if single-stranded may be the coding (sense) strand or non-coding (anti-sense) strand. The coding sequence which encodes the native IL-13Rα2 protein may be identical to the nucleotide sequence shown in FIG. 2. It may also be a different coding sequence which, as a result of the redundancy or degeneracy of the genetic code, encodes the same polypeptide as shown in SEQ ID NO:1 (FIG. 1).

[0062] Other nucleic acid molecules useful in the invention are variants of the native IL-13Rα2 gene such as those that encode fragments (e.g., post-translationally processed forms of), analogs and derivatives of a native IL-13Rα2 protein. Such variants may be, e.g., a naturally occurring allelic variant of the native IL-13Rα2 gene, a homolog of the native IL-13Rα2 gene, or a non-naturally occurring variant of the native IL-13Rα2 gene. These variants have a nucleotide sequence that differs from the native IL-13Rα2 gene in one or more bases. For example, the nucleotide sequence of such variants can feature a deletion, addition, or substitution of one or more nucleotides of the native IL-13Rα2 gene. Nucleic acid insertions are preferably of about 1 to 10 contiguous nucleotides, and deletions are preferably of about 1 to 30 contiguous nucleotides.

[0063] Naturally occurring allelic variants of the native IL-13Rα2 gene within the invention are nucleic acids isolated from human tissue that have at least 75% (e.g., 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, and 99%) sequence identity with the native IL-13Rα2 gene, and encode polypeptides having structural similarity to native IL-13Rα2 protein. Homologs of the native IL-13Rα2 gene within the invention are nucleic acids isolated from other species that have at least 75% (e.g., 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, and 99%) sequence identity with the native IL-13Rα2 gene, and encode polypeptides having structural similarity to native IL-13Rα2 protein. Public and/or proprietary nucleic acid databases can be searched in an attempt to identify other nucleic acid molecules having a high percent (e.g., 70, 80, 90% or more) sequence identity to the native IL-13Rα2 gene.

[0064] Non-naturally occurring IL-13Rα2 gene variants are nucleic acids that do not occur in nature (e.g., are made by the hand of man), have at least 75% (e.g., 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, and 99%) sequence identity with the native IL-13Rα2 gene, and encode polypeptides having structural similarity to native IL-13Rα2 protein. Examples of non-naturally occurring IL-13Rα2 gene variants are those that encode a fragment of a IL-13Rα2 protein, those that hybridize to the native IL-13Rα2 gene or a complement of to the native IL-13Rα2 gene under stringent conditions, those that share at least 65% sequence identity with the native IL-13Rα2 gene or a complement of the native IL-13Rα2 gene, and those that encode a IL-13Rα2 fusion protein.

[0065] Nucleic acids encoding fragments of native IL-13Rα2 protein within the invention are those that encode, e.g., 2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300 or more amino acid residues of the native IL-13Rα2 protein. Shorter oligonucleotides (e.g., those of 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 30, 50, 100, 125, 150, or 200 base pairs in length) that encode fragments of the native IL-13Rα2 protein can be used. Nucleic acids encoding fragments of native IL-13Rα2 protein can be made by enzymatic digestion (e.g., using a restriction enzyme) or chemical degradation of the full length native IL-13Rα2 gene or variants thereof.

[0066] Nucleic acid molecules encoding IL-13Rα2 fusion proteins are also within the invention. Such nucleic acids can be made by preparing a construct (e.g., an expression vector) that expresses a IL-13Rα2 fusion protein when introduced into a suitable host. For example, such a construct can be made by ligating a first polynucleotide encoding an IL-13Rα2 protein fused in frame with a second polynucleotide encoding another protein (e.g., a detectable label or carrier protein) such that expression of the construct in a suitable expression system yields a fusion protein. IL-13Rα2 fusion proteins can be used, e.g., to enhance the immunogenicity of IL-13Rα2 peptides, to facilitate purification of IL-13Rα2 proteins/peptides, or to track the location of the IL-13Rα2 fusion protein after it has been administered to a subject.

[0067] Using the nucleotide sequence of the native IL-13Rα2 gene and the amino acid sequence of a native IL-13Rα2 protein, those skilled in the art can create nucleic acid molecules that have minor variations in their nucleotide sequences, by, for example, standard nucleic acid mutagenesis techniques or by chemical synthesis. Variant IL-13Rα2 nucleic acid molecules can be expressed to produce variant IL-13Rα2 proteins.

Naked Nucleic Acid Vaccines

[0068] The invention provides for the use of naked nucleic acid vaccines to stimulate an immune response against IL-13Rα2. Representative naked nucleic acid vaccines for use in this method include a DNA encoding one or more immunogenic portions of IL-13Rα2 along with sufficient other 5' and 3' elements to direct expression of the foregoing. The use of naked nucleic acids for stimulating both class I and class II restricted immune responses against a particular protein is known in the art. See, e.g., Rosenberg, S. A., Immunity 10:281, 1999; Ulmer et al., Science, 259:1745, 1993; Donnelly et al., Ann. NY Acad. Sci., 772:40, 1995; Scheurs et al., Cancer res. 58:2509, 1998; Hurpin et al., Vaccine 16:208, 1998; Lekutis et al., J. Immunol. 158:4471, 1997; Manickan et al., J. Leukoc. Biol. 61:125, 1997. These methods can be adapted for use in the present invention by using a nucleic acid encoding one or more immunogenic portions of IL-13Rα2. Naked nucleic acid vaccines can be administered to a subject by any suitable technique. For example, naked DNA encoding a peptide portion of IL-13Rα2 can be injected into muscle cells of a subject or naked DNA-coated gold particles can be introduced into skin cells (to be taken up by dendritic cells) of a subject using a gene gun.

Expression Vector Vaccines

[0069] The invention also provides for the use of expression vector vaccines to stimulate an immune response against IL-13Rα2. In a typical application of this technique, a nucleic acid encoding one or more peptide or protein antigens of IL-13Rα2 is incorporated into a vector that allows expression of the antigen(s) in a host cell (e.g., a cell inside a subject or administered to a subject). The nucleic acid encoding the antigen(s) is generally be under the operational control of other sequences contained within the vector such as a promoter sequences (e.g., tissue specific, constitutively active, or inducible) or enhancer sequences. The antigen(s) encoded by the vector are expressed when the vector is introduced into a host cell in a subject. After expression, the antigen(s) can associate with an MHC molecule for presentation to immune system cells such as T lymphocytes, thus stimulating an immune response. See, e.g., Corr et al., J. Exp. Med. 184:1555 (1996).

[0070] Vectors for use in the invention can be any capable of expressing an encoded antigen(s) in a subject. For example, vectors derived from bacterial plasmids and viruses may be used. Representative viral vectors include retroviral, adenoviral, and adeno-associated viral vectors. See, e.g., Gene Therapy: Principles and Applications, ed. T. Blackenstein, Springer Verlag, 1999; Gene Therapy Protocols (Methods in Molecular Medicine), ed. P. D. Robbins, Humana Press, 1997; and Retro-vectors for Human Gene Therapy, ed. C. P. Hodgson, Springer Verlag, 1996.

Cell-Based Vaccines

[0071] Cell-based vaccines are provided in the invention to stimulate an immune response against IL-13Rα2. In similar approaches using different cancer-associated antigen, cancer cells isolated from a patient have been harbored in vitro and transfected with DNA encoding for immune stimulants, such as cytokines, MHC molecules or co-stimulatory molecules. The transfected cancer cells were then re-injected to the patient in order to activate the immune system in order to generate an anti-cancer response. Greten, T. F., and E. M. Jaffee, J. Clin. Oncol., 17: 1047-1060, 1999; Simons et al., Cancer Res., 57: 1537-1546, 1997.

[0072] The invention further provides an isolated cell expressing IL-13Rα2 or a peptide fragment of IL-13Rα2 Cells expressing IL-13Rα2 can be isolated from a subject having such cells (e.g., from testis or HGG). Cells that do not express IL-13Rα2 can be made to express this protein in a number of different ways. As one example, cells can be cultured with IL-13Rα2 or peptide fragments thereof under conditions in which fragments of IL-13Rα2 become associated with MHC molecules on the cell surface. Alternatively, cells can be made to express IL-13Rα2 by introducing a nucleic acid encoding an IL-13Rα2 protein, a peptide fragment of IL-13Rα2, or a variant of the foregoing into the cells, and culturing such cells under conditions that cause the cells to express the protein or peptide. Cellular expression of the protein, peptide, or variant can be monitored by any conventional technique. For example, fluorescently labeled antibodies that specifically bind the protein, peptide, or variant can be used to detect expression of the protein, peptide, or variant on a cell. See, e.g., Kim et al., J. Immunother. 20:276, 1997. In addition, Western blotting using antibodies that specifically bind the protein, peptide, or variant can be used to detect expression of the protein, peptide, or variant in lysates of a cell.

[0073] Cell types suitable for stimulating an immune response against IL-13Rα2 can be prokaryotic or eukaryotic. A number of such cells are known in the art, so an exhaustive list is not provided herein. Examples of suitable prokaryotic cells include bacterial cells such as E. coli, B. subtilis, and mycobacteria. Examples of suitable eukaryotic cells include plant, yeast, insect, avian, nematode (e.g., C. elegans), and mammalian cells (e.g., autologous cells from a human patient that are to be later reintroduced into the patient). These cells can be cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences.

[0074] Further examples of cells that can be used to stimulate an immune response against IL-13Rα2 include those that express a peptide comprising a least 7 (e.g., 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or more) contiguous amino acids of SEQ ID NO:1. For instance, an isolated cell expressing a protein having the sequence of SEQ ID NO:1 can be used. Cells into which have been introduced a purified nucleic acid that encodes a peptide comprising a least 7 contiguous amino acids of SEQ ID NO:1 might also be used.

[0075] Although any cell that can express IL-13Rα2 protein, a peptide fragment of IL-13Rα2, or a variant of the foregoing can be used to stimulate an immune response in a subject, some are preferred because of their particular antigen presentation capabilities. Examples of such cells include antigen-presenting cells (APCs) such as B lymphocytes, monocytes/macrophages, dendritic cells (DC), and other cells expressing major histocompatability complex (MHC) and/or costimulatory molecules.

[0076] As DC are known to function as particularly strong APCs able to efficiently take up, process, and present various forms of antigens to immunologically naive T cells, their use in the cell-based vaccine of the invention is particularly preferred. See, e.g., Banchereau et al., Ann. Rev. Immunology, 18:767, 2000. DC primed with a specific tumor antigen (e.g., IL-13Rα2 or peptide fragments thereof) can thus activate an anti-tumor cytotoxic T lymphocyte (CTL) response that can provide protection against and cause regression of a tumor. Several tumor-associated antigens represent tissue differentiation antigens that are poorly immunogenic due to an immune tolerance to self-antigens. Stimulation with antigen-loaded DC, however, can break tolerance to tumor-associated antigens and induce anti-tumor cytotoxic immune responses.

[0077] DC can be made to express an IL-13Rα2 protein, a peptide fragment of IL-13Rα2, or a variant thereof as described above. For example, DC can be removed from a subject, contacted with the selected antigen, and then returned to the subject to stimulate an immune response. Ex vivo protocols for DC priming with tumor-associated antigen are known in the art. See, e.g., Kumamoto et al., J Dermatol. 28:658, 2001 and Fong et al. J. Immunol. 167:7150-2001. Generally, DC are isolated from peripheral blood by, for example, density gradient separation, fluorescence-activated cell sorting and immunological cell separation methods. See, e.g., U.S. Pat. No. 6,194,204. The isolated DC are then cultured in media supplemented with purified antigen (e.g., IL-13Rα2) so that the DC can process the antigen for presentation to T cells. The antigen-loaded DC can be administered to a patient (e.g., injection) in a therapeutically effective amount (e.g., an amount that causes tumor regression). To enhance this response, the DC may be exposed to a cytokine (e.g., GM-CSF/IL-4) prior to administration. Tanigawa et al., J. Immunother. 26:493, 2001. In addition, specific antigen can be targeted to DC according to known methods. See, e.g., Nature Biotech. 17:253, 1999.

[0078] Those cell-based vaccines that are most effective in stimulating an immune response against IL-13Rα2 in a subject can be determined by preparing a series of different cell-based vaccine (e.g. those expressing whole antigen or specific peptide fragments of the antigen), administering a subject (or a series of genetically similar subjects) such different vaccines, and analyzing the subject(s) for the stimulation of an immune response. Those vaccines that induce the desired response can then be selected.

Anti-Idiotypic Antibody Vaccines

[0079] The invention also contemplates the use of anti-idiotypic antibody vaccines to stimulate an immune response against IL-13Rα2 in a subject. In this method, anti-idiotypic antibodies are prepared that feature an internal "image" of one or more immunogenic portions of IL-13Rα2. See, e.g., U.S. Pat. Nos. 5,053,224; 5,208,146; 5,612,030; and 5,925,362. Administration of these anti-idiotypic antibodies in a vaccine composition to a subject can stimulate an immune response against the "image" of an immunogenic portion of IL-13Rα2 which cross-reacts against actual immunogenic portions of IL-13Rα2. As one example, polyclonal anti-idiotypic antibodies can be generated by immunizing a host animal with monoclonal antibodies raised against an epitope of IL-13Rα2. Methods of preparing monoclonal and polyclonal antibodies as described in more detail below.

Antibody Production

[0080] The vaccines/antigenic agents featured in the invention can be used to raise antibodies useful in the invention. Polyclonal antibodies are heterogeneous populations of antibody molecules that are contained in the sera of the immunized animals. Antibodies within the invention therefore include polyclonal antibodies and, in addition, monoclonal antibodies, single chain antibodies, Fab fragments, F(ab')₂ fragments, and molecules produced using a Fab expression library. Monoclonal antibodies, which are homogeneous populations of antibodies to a particular antigen, can be prepared using the IL-13Rα2 proteins and peptides described above and standard hybridoma technology (see, for example, Kohler et al., Nature 256:495, 1975; Kohler et al., Eur. J. Immunol. 6:511, 1976; Kohler et al., Eur. J. Immunol. 6:292, 1976; Hammerling et al., "Monoclonal Antibodies and T Cell Hybridomas," Elsevier, N.Y., 1981; Ausubel et al., supra). In particular, monoclonal antibodies can be obtained by any technique that provides for the production of antibody molecules by continuous cell lines in culture such as described in Kohler et al., Nature 256:495, 1975, and U.S. Pat. No. 4,376,110; the human B-cell hybridoma technique (Kosbor et al., Immunology Today 4:72, 1983; Cole et al., Proc. Natl. Acad. Sci. USA 80:2026, 1983), and the EBV-hybridoma technique (Cole et al., "Monoclonal Antibodies and Cancer Therapy," Alan R. Liss, Inc., pp. 77-96, 1983). Such antibodies can be of any immunoglobulin class including IgG, IgM, IgE, IgA, IgD and any subclass thereof. A hybridoma producing a mAb of the invention may be cultivated in vitro or in vivo. The ability to produce high titers of mAbs in vivo makes this a particularly useful method of production.

[0081] Human or humanoid antibodies that specifically bind a IL-13Rα2 protein can also be produced using known methods. For example, polyclonal antibodies can also be collected from human subjects having such antibodies in their sera, e.g., subjects administered vaccines that stimulate antibody production against IL-13Rα2. As another example, human antibodies against IL-13Rα2 protein can be made by adapting known techniques for producing human antibodies in animals such as mice. See, e.g., Fishwild, D. M. et al., Nature Biotechnology 14 (1996): 845-851; Heijnen, I. et al., Journal of Clinical Investigation 97 (1996): 331-338; Lonberg, N. et al., Nature 368 (1994): 856-859; Morrison, S. L., Nature 368 (1994): 812-813; Neuberger, M., Nature Biotechnology 14 (1996): 826; and U.S. Pat. Nos. 5,545,806; 5,569,825; 5,877,397; 5,939,598; 6,075,181; 6,091,001; 6,114,598; and 6,130,314. Humanoid antibodies against IL-13Rα2 can be made from non-human antibodies by adapting known methods such as those described in U.S. Pat. Nos. 5,530, 101; 5,585,089; 5,693,761; and 5,693,762.

[0082] Once produced, polyclonal or monoclonal antibodies can be tested for specific IL-13Rα2 recognition by Western blot or immunoprecipitation analysis by standard methods, for example, as described in Ausubel et al., supra. Antibodies that specifically recognize and bind to IL-13Rα2 are useful in the invention. For example, such antibodies can be used in an immunoassay to monitor the level of IL-13Rα2 in a sample (e.g., to determine the amount of cellular expression or subcellular location of IL-13Rα2, or the presence and amount of soluble forms of IL-13Rα2 in a liquid sample).

[0083] Preferably, IL-13Rα2 protein selective antibodies of the invention are produced using fragments of the IL-13Rα2 protein that lie outside highly conserved regions and appear likely to be antigenic by criteria such as high frequency of charged residues. Cross-reactive anti-IL-13Rα2 protein antibodies are produced using a fragment of a IL-13Rα2 protein that is conserved among members of this family of proteins. In one specific example, such fragments are generated by standard techniques of PCR, and are then cloned into the pGEX expression vector (Ausubel et al., supra). Fusion proteins are expressed in E. coli and purified using a glutathione agarose affinity matrix as described in Ausubel, et al., supra.

[0084] In some cases it may be desirable to minimize the potential problems of low affinity or specificity of antisera. In such circumstances, two or three fusions can be generated for each protein, and each fusion can be injected into at least two rabbits. Antisera can be raised by injections in a series, preferably including at least three booster injections. Antiserum is also checked for its ability to immunoprecipitate recombinant IL-13Rα2 proteins or control proteins, such as glucocorticoid receptor, CAT, or luciferase.

[0085] Techniques described for the production of single chain antibodies (e.g., U.S. Pat. Nos. 4,946,778, 4,946,778, and 4,704,692) can be adapted to produce single chain antibodies against a IL-13Rα2 protein, or a fragment thereof. Single chain antibodies are formed by linking the heavy and light chain fragments of the Fv region via an amino acid bridge, resulting in a single chain polypeptide.

[0086] Antibody fragments that recognize and bind to specific epitopes can be generated by known techniques. For example, such fragments include but are not limited to F(ab')₂ fragments that can be produced by pepsin digestion of the antibody molecule, and Fab fragments that can be generated by reducing the disulfide bridges of F(ab')₂ fragments. Alternatively, Fab expression libraries can be constructed (Huse et al., Science 246:1275, 1989) to allow rapid and easy identification of monoclonal Fab fragments with the desired specificity.

Method of Inducing an Anti-IL-13Rα2 Immune Response in a Subject

[0087] The invention provides methods for stimulating a immune response against IL-13Rα2 in a subject having or at risk for developing a cancer having cells expressing IL-13Rα2. Such methods can be performed by (a) formulating as anti-cancer vaccine composition (as described above) outside of the subject and (b) administering the vaccine to the subject in an amount sufficient to stimulate an immune response against IL-13Rα2 in the subject.

Subjects

[0088] The compositions and methods of the invention can be utilized with any suitable subject, e.g., an animal such as a mammal (e.g., human beings, dogs, cats, goats, sheep, cows, horses, etc.). A human patient suffering or at risk for developing a cancer or other disease that has cells that overexpress IL-13Rα2 (e.g., a brain cancer such as HGG) is a particularly preferred subject.

IL-13Rα2 as a Component of a Polyvalent Vaccine

[0089] The invention also provides polyvalent vaccines that incorporate one or more of the foregoing compositions that can stimulate an immune response against IL-13Rα2 in a subject. Two general types of polyvalent vaccines are within the invention. First, a vaccine that contains more than one agent that can stimulate and immune response against IL-13Rα2 (e.g., a composition that contains 2, 3, 4, 5, 6, 7, 8, or more different peptides listed in Table 1 below). Second, a vaccine that contains both (a) an agent that can stimulate and immune response against IL-13Rα2 and (b) a different agent that can stimulate an immune response against a molecule other than IL-13Rα2 (e.g., another TSA or TAA).

Administering Vaccines to a Subject

[0090] The vaccine compositions of the present invention can be used in a method for stimulating an immune response against IL-13Rα2 in a subject. In this method, an vaccine composition of the invention can be administered to a subject by any method that stimulates the aforesaid immune response. The exact method selected is determined by the particular vaccine composition to administered. For parenteral administration by injection, the injection can be in situ (i.e., to a particular tissue or location on a tissue, e.g., into a tumor or lymph node), intramuscular, intravenous, intraperitoneal, or by another parenteral route. For example, for a protein/peptide based vaccine the vaccine may be administered by subcutaneous or intradermal injection. In some cases other routes can be used, e.g. intravenous injection, intraperitoneal injection, or in situ injection into target tissue.

[0091] Naked nucleic acid vaccines or expression vector vaccines may be administered by intramuscular injection. Cell-based vaccines can be introduced into an animal by any suitable method, e.g., subcutaneous injection. In addition to parenteral routes, the vaccines of the invention can also be administered by a non-parenteral route, e.g, by oral, buccal, urethral, vaginal, or rectal administration.

[0092] Formulations for injection may be presented in unit dosage form, for example, in ampoules or in multi-dose containers, with an added preservative. The compositions may take such forms as suspensions, solutions or emulsions in oily or aqueous vehicles, and may contain formulatory agents such as suspending, stabilizing and/or dispersing agents. Alternatively, the vaccine compositions may be in powder form (e.g., lyophilized) for constitution with a suitable vehicle, for example, sterile pyrogen-free water, before use.

[0093] To facilitate delivery of the antigenic compositions (e.g., antigenic agent plus adjuvant) of the invention to an animal, the antigenic compositions can be mixed with a pharmaceutically acceptable carrier or excipient. Examples of such pharmaceutically acceptable carriers and excipients include diluents such as water, saline, citrate buffered saline, phosphate buffered saline, acetate buffered saline, and bicarbonate buffered saline; and stabilizing agents such as amino acids, alcohols, proteins (for example, serum albumin), EDTA, mannitol, sorbitol, and glycerol. To minimize the chance of infection or adverse reaction when administered to a subject, carriers and excipients are preferably sterile and pyrogen-free. USP grade carriers and excipients are particularly preferred for delivery of vaccine compositions to human subjects. The vaccine compositions can also be formulated for long-term release as a depot preparation by adding the antigenic agent to suitable polymeric or hydrophobic materials or ion exchange resins. They can also be made by preparing the vaccine composition as a sparingly soluble derivative. Depot preparations can be administered to a subject by implantation (e.g., subcutaneous or intramuscular surgical implantation) or by injection. Methods for making the foregoing formulations are well known and can be found in, for example, Remington's Pharmaceutical Sciences.

Dosing

[0094] The vaccine compositions of the invention are preferably administered to a subject in an amount sufficient to stimulate an immune response against IL-13Rα2 in the subject, and not cause an overly toxic effect. Such a therapeutically effective amount can be determined as described below.

[0095] Toxicity and therapeutic efficacy of the vaccines utilized in the invention can be determined by standard pharmaceutical procedures, using either cells in culture or experimental animals to determine the LD₅₀ (the dose lethal to 50% of the population) and the ED₅₀ (the dose therapeutically effective in 50% of the population). The dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD₅₀/ED₅₀. Vaccines that exhibit large therapeutic indices are preferred. While those that exhibit toxic side effects may be used, care should be taken to design a delivery system that minimizes the potential damage of such side effects. Data obtained from animal studies can be used in formulating a range of dosage for use in humans. The dosage of such vaccines lies preferably within a range that include an ED₅₀ with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.

[0096] The vaccines of the invention can be administered to a subject using various different vaccination schedules. For example, a nucleic acid vaccine might be administered to a subject only once, while a protein/peptide-based vaccine might be administered to the subject on multiple occasions (1, 2, 3, 4, 5 or more times). For example, in an effort to stimulate a strong immune response, a first dose of a vaccine compositions of the invention may be administered to a subject at least 24 hours before a second (booster) dose is administered to the subject.

Kits

[0097] The invention also provides kits for stimulating an immune response against IL-13Rα2 in a subject. Such kits can include a container holding one or more of the antigenic agents described above in a pharmaceutically acceptable form. The antigenic agent(s) in the container can be in liquid form (e.g., as a solution) or in solid form (e.g., as a lyophilized or desiccated powder). Where, for example, the antigenic agent is a solid, the kits within the invention can further include a container holding a pharmaceutically acceptable solution (e.g., sterile saline with or without dextrose) for reconstituting the solid into a liquid suitable for injection. The kits of the invention can further include (a) one or more devices to administer the antigenic agent, e.g., a needle or syringe, a packaged alcohol pad, etc.; and/or (b) printed instructions for using the kit.

EXAMPLES

Example 1

IL-13Rα2 Mimics the Biological Features of an HGG-Associated Receptor for IL-13

[0098] Normal Chinese hamster ovary (CHO) cells were transfected with a pcDNA 3.1 plasmid (Invitrogen) containing the full length open reading frame of IL-13Rα2 and positive clones were selected with geneticin. The expression of IL-13Rα2 in these clones was tested for their ability to bind ¹²⁵I-labeled IL-13. Selected clones were shown to bind labeled IL-13 independently of IL-4. In addition, labeled IL-13 was displaced by IL-13.E13K, a mutant of IL-13 shown to have a greater affinity for the IL-13 binding protein on HGG than for the shared IL-13/IL-4 receptor found in a plethora of tissues under a physiological state. Furthermore, these IL-13R transfected CHO cells were exposed to an IL-13.E13K-PE38QQR cytotoxin, a fusion protein showing potent dose dependent cytotoxicity on HGG cells. The clones expressing the receptor were killed in direct proportion to their affinity for IL-13, but not CHO cells alone or CHO cells transfected with an empty plasmid. In neutralization experiments, an excess of IL-13 prevented the cytotoxic effect of IL-13.E13K-PE38QQR. Therefore the only way the toxin, PE38QQR, could have entered and killed the cells was through receptor-mediated endocytosis, a process directed through the IL-13 portion of the cytotoxin. Use of an IL13.E13K/enhanced green flourescent protein (EGFP) fusion protein confirmed that this process occurred. Thus, IL-13Rα2 was demonstrated to share properties ascribed to more restrictive, IL-4 independent, IL-13 binding sites found on HGGs in situ and in vitro.

Example 2

Identification of IL-13Rα2 as a Cancer Testis Antigen

Materials and Methods

[0099] Sources of RNA. High-grade glioma cell lines A-172 MG, U-373 MG, U-251 MG and human glioblastoma multiforme explant cells (G-48) were grown in culture in appropriate media. Total RNA was extracted from the cells using the acid-guanidium isothiocyanate-phenol-chloroform method. Poly(A)+ RNA was further isolated using the Mini-oligo(dT) Cellulose Spin Column Kit (5 prime-3 prime Inc., Boulder, Colo.). 2 μg of Poly (A)+ RNA was electrophoresed on a 1% agarose formaldehyde gel, transferred to 0.45 μm magna charge nylon (MSI, Westborough, Mass.) and UV-crosslinked (Stratagene, La Jolla, Calif.). RNA-blotted membranes were also purchased from Clontech (Palo Alto, Calif.). Two Multiple Tissue Expression (MTE®) Blots (cat #7770-1 and 7775-1; www.clontech.com/mtn/index.html) were analyzed to determine the tissue distribution of the IL13 binding proteins. Two sets of Human Brain Multiple Tissue Northern (MTN®) Blots (cat #7755-1 and 7769-1) were assayed to confirm the true presence of the transcripts. In addition, two Human Tissue Northern (MTN®) Blots (cat #7759-1 and 7760-1) were analyzed to verify the tissue distribution of the IL-13Rα2 transcript.

[0100] cDNA Probes. cDNA probes were generated either by PCR (IL-13Rα2 and IL13Rα1) or by restriction digest (IL-4Rα=p140). cDNA containing human IL13Rα2 was provided by Dr. Pascual Ferrara of Sanofi Recherche. cDNA containing human IL13Rα1 (and also 93 bases of murine IL-13) was provided by Dr. Douglas J. Hilton of The Walter and Eliza Hall Institute of Medical Research. Plasmid pHuIL4R/ID was used to obtain a fragment of IL4Rα by the restriction digest. The fragments were electrophoresed on a 1% agarose gel, excised from the gel and purified using QIAquick Gel Extraction Kit (Qiagen Inc., Valencia, Calif.). Actin cDNA was purchased from Clontech Labs.

The primers for human IL-13Rα2 were as follows:

TABLE-US-00001 forward (SEQ ID NO: 3) 5'-AAGATTTGGAAGCTTATGGCTTTCGTTTGC-3' reverse (SEQ ID NO: 4) 5'-TCCCTCGAAGCTTCATGTATCACAGAAAAA-3'

The primers for human IL13Rα1 were as follows:

TABLE-US-00002 forward 5'-ATTATTAAGCTTATGGAGTGGCCGGCG-3' (SEQ ID NO: 5) reverse 5'-TAACCGGAAGCTTCACTGAGAGGCTTT-3' (SEQ ID NO: 6)

[0101] Northern Blot Analysis. Membranes were pre-hybridized overnight at 42° C. in a solution consisting of 50% formamide, 5×SSC, 50 mM sodium phosphate, 5× Denhardt's, 50 μg/ml sheared salmon sperm DNA, and 1% SDS. Membranes were subsequently hybridized overnight at 42° C. in the same solution with the addition of full length cDNA probes labeled by random priming (Life Technologies, Rockville, Md.) with ³²P-dCTP using 1-2×10⁶ cpm/ml. Following hybridization, the membranes were washed with 2×SSC/0.2% SDS at 42° C. for 20 minutes followed by two washes with 1×SSC/0.1% SDS at 42° C. for 20 minutes each. The membranes were exposed to autoradioraphic film X-OMAT AR (Eastman Kodak Co., Rochester, N.Y.) and placed at -80° C. for 1, 3 and 14 days. The membranes were subsequently stripped and re-probed up to three more times. The membranes were probed first with IL-13Rα2, followed by IL13Rα1, IL-4Rα=p140, and actin. Films were scanned on a transparency scanner at a pixel size of 88×88 micron (Molecular Dynamics, Sunnyvale, Calif.). The images were compiled in Paint Shop Pro V 5.0 (Jasc software Inc., Eden Prairie, Minn.).

Results

[0102] Northern blot analysis of transcripts for IL-13Rα2 in normal organs. To explore the expression of IL-13Rα2, an extensive examination of the presence of transcripts for this protein among multiple normal tissues, including 20 discrete regions of the CNS and a variety of normal peripheral organs was performed. All Northern blots using same membranes were performed with respective labeled cDNAs in the following order: IL-13Rα2, IL13Rα1, IL4α and β-actin. This assured that the levels of transcripts for IL-13Rα2 were not underestimated due to the usage of membranes with mRNA. Both the dot-blot analyses (not shown) and the electrophoretically separated transcripts for IL-13Rα2 (FIG. 4, panels I-IV) demonstrated mostly undetectable, or very weak signals in few cases, of IL-13Rα2 transcripts in the organs studied, even after 2-week of film exposure. The first dot blot performed, however, surprisingly showed an unusually high density of labeling with IL-13Rα2 cDNA probe to transcripts derived from testis. This was also found using another Northern blot membrane. A few other organs had transcripts that hybridized to the IL-13Rα2 cDNA (aorta, liver, and pituitary gland). The density of labeling in the dot blots was much lower than in the testis blot. Of importance, there was no evidence for the presence of significant IL-13Rα2 expression in the CNS.

[0103] To confirm these findings made using dot blot analysis, additional blots were performed using electrophoretically separated mRNAs. Again, the discrete regions of normal human brain did not produce clear-cut hybridization signals (FIG. 4, panels I and II). On the other hand, the only organ with prominent hybridization band corresponding to the mRNA of 1.5 kb was seen in testis (FIG. 4, panel III). Poorly detectable signals were seen in placenta, liver, and kidney (FIG. 4, panel IV). Thus, among normal tissues, testes was the only one that prominently expressed IL-13Rα2. No transcripts for IL-13Rα2 were readily detected in the CNS.

[0104] Northern blot analysis of transcripts for IL13Rα1 in normal tissues. The expression of IL13Rα1, a component of a heterodimeric form of IL13 receptor that is shared with IL4, IL13/4 receptor was examined in a variety of normal human tissues (FIG. 5) by either dot-blot analyses (not shown) or blots of electrophoretically separated transcripts (FIG. 5, panels I-IV). The results unequivocally demonstrated that IL13Rα1 was expressed in a variety of the organs, including CNS tissue from medulla, spinal cord, substantia nigra, thalamus, and corpus callosum. Size fractionated mRNAs confirmed the many positive signals seen in dot blots with the strongest signals observed in ovary, heart, liver and lung (FIG. 5, panels III and IV, respectively). Of interest, liver showed two hybridized species of mRNA: one of 4.5 kb and the other of 2.0 kb, as an example of a normal organ with doublet of positive signals of different sizes. In summary, discrete regions of normal human brain did produce clear-cut positive hybridization signals for IL13Rα1 (FIG. 5, panels I and II). In addition, many vital peripheral organs exhibited hybridization bands corresponding to the mRNA of 4.5-4.65 kb (FIG. 5, panels III and IV).

[0105] Gene expression analysis of IL4Rα in normal tissues. In addition to IL13Rα1, IL4Rα is another component of a heterodimeric form of IL13 receptor that is shared with IL4, i.e., the shared IL13/4 receptor. Thus, whether the distribution of IL4Rα gene expression corresponded to that of IL13Rα1 was analyzed. All Northern blot analysis membranes used in this study demonstrated enriched content of the IL4Rα transcripts in a variety of tissues (FIG. 6, panels I, II, and IV). The presence of the transcripts within the CNS was most evident, as it was for IL13Rα1, in medulla, spinal cord, substantia nigra and thalamus (FIG. 6, panels I and II). Among normal peripheral organs, liver, lung, kidney, intestinal tract, spleen, stomach, and testis demonstrated gene expression of IL4Rα, which was generally similar to that seen with IL13Rα1 (not shown). Thus, discrete regions of normal human brain contain transcripts for both IL13Rα1 and IL4Rα, a complete heterodimer of the shared IL13/4 receptor. Furthermore, several vital peripheral organs contained the two subunits of the IL13/4 receptor, including heart, liver, lung and intestinal tract.

[0106] Control hybridization of β-actin. All membranes used for Northern blot analysis of IL13 receptors transcripts were also hybridized with a cDNA probe for a house-keeping gene, β-actin (FIG. 7; dot blots and panel III not shown). The intensity of the signals for β-actin was usually in accordance with the amount of mRNA present on the membranes, as estimated by the manufacturer.

[0107] Gene expression of IL13 receptors in cells. Gene expression of the two IL13 receptors was also examined in malignant and normal cells (FIG. 8). Transcripts for IL-13Rα2, IL13Rα1, IL4Rα and β-actin were examined in serial hybridization assays. Isolated explant cells of HGG (G-48) as well as human malignant glioma established cell lines (A-172 MG, U-373 MG, and U-251 MG) demonstrated intense signals for IL-13Rα2 (FIG. 8). On the other hand, the transcripts for the elements of the shared IL13/4 receptor, IL-13Rα1 and IL4Rα, were found at lower levels when compared with that for IL-13Rα2 (FIG. 8). A-172 MG cells appeared to be the most enriched in the components of the IL13/4 receptor heterodimer. Of interest, two species of different sizes of the transcripts for both IL-13Rα2 and IL-13Rα1 were seen in cells (FIG. 8). In a control assay, human umbilical vein endothelial cells (HUVEC) showed the presence of transcripts for IL-13Rα1 and IL4Rα, but not those for IL-13Rα2 (FIG. 8). In summary, gene expression of IL-13Rα2 was detected in two specimens of HGG (FIG. 8, HGG 13 and HGG 52), but not in two normal brain specimens (FIG. 8, NB 3 and NB 6). However, the transcripts for IL-13Rα1 were found in all of these specimens. In other experiments, several additional HGG brain tumor specimens were determined to express IL-13Rα2.

Example 3

Representative Immunogenic Peptides of IL-13Rα2

[0108] Table I presents a list of IL-13Rα2 peptides that might be used to stimulate an immune response against IL-13Rα2 in a subject. The listed peptides were obtained using a computer program provided by the Ludwig Institute For Cancer Research (Lausanne, Switzerland) on the Internet at http://www-ludwig.unil.ch.SEREX.html. This program provided the best (at high stingency) fit of predicted immunogenic peptides that bind specific classes of MHC molecules (i.e., the various alleles of human MHC Class I indicated in Table I). The peptides indicated with the "*" are those that should bind under high stringency. The skilled artisan could produce these peptides as described herein (e.g., by automated peptide synthesis) and use each in a vaccine preparation that would be administered to a variety of test subjects (e.g. those with different MHC types) as also described herein. The immune response stimulated by each of these peptides in the subjects could then be assessed, so that those that stimulate the desired immune responses in particular test subjects could be identified.

TABLE-US-00003 TABLE I Binding peptides prediction: Allele Peptide Position Score t1/2 A1 IVDP-GYLGY 16-24 7.120 1236.45043346563 A1 LLDTNYNLFY 140-149 4.820 123.965090779824 A_0201 YLYLQWQPPL * 24-33 5.760 317.34832891785 A_0201 YLQWQPPLSL * 26-35 4.600 99.4843156419338 A_0201 LQWQ-PPLSL 27-35 3.430 30.876642749677 A_0201 SLDHFKECTV 34-43 3.330 27.9383417032365 A_0201 NLHYKDGFDL * 64-73 4.830 125.210960654765 A_0201 WQCT-NGSEV 87-95 3.490 32.7859477062319 A_0201 CVYY-NWQYL * 121-129 4.020 55.7011058267956 A_0201 YLLCSWKPGI * 128-137 5.190 179.468552931832 A_0201 VLLD-TNYNL * 139-147 6.320 555.572992451403 A_0201 NLFY-WYEGL * 146-154 4.080 59.1454698498823 A_0201 GLDH-ALQCV * 153-161 4.160 64.0715225999366 A_0201 NIGC-RFPYL 170-178 3.420 30.5694150210502 A_0201 FQLQNIVKPL * 206-215 4.450 85.6269440022006 A_0201 QLQN-IVKPL * 207-215 3.900 49.4024491055302 A_0201 NIVK-PLPPV 210-218 3.090 21.9770779757634 A_0201 YLTFTRESSC 219-228 3.140 23.1038668587222 A_0201 QLCFVVRSKV * 279-288 4.250 70.1054123466879 A_0205 IVDPGYLGYL 16-25 3.120 22.6463796431754 A_0205 YLYLQWQPPL * 24-33 4.140 62.8028214492017 A_0205 LQWQ-PPLSL 27-35 3.350 28.5027336437673 A_0205 LQWQ-PPLSL 26-35 3.040 20.9052432350928 A_0205 CVYY-NWQYL * 121-129 4.430 83.9314169102688 A_0205 VLLD-TNYNL * 139-147 4.670 106.697742432451 A_0205 VLLD-TNYNL * 138-147 3.740 42.0979901649969 A_0205 NLFY-WYEGL 146-154 3.040 20.9052432350928 A_0205 FQLQNIVKPL * 206-215 4.610 100.484149636389 A3 LLDTNYNLFY 140-149 3.190 24.2884274430946 A3 ALQC-VDYIK 157-165 4.520 91.8355979781567 A3 GIWS-EWSDK 296-304 3.410 30.2652442594001 A24 DFEIVDPGYL 13-22 3.410 30.2652442594001 A24 LYLQ-WQPPL * 25-33 5.710 301.87106828279 A24 EYEL-KYRNI * 44-52 4.320 75.1886282920231 A24 TYWI-SPQGI * 103-111 4.090 59.7398917041452 A24 VYYN-WQYLL * 122-130 5.300 200.336809974792 A24 WYEG-LDHAL * 150-158 5.890 361.405284372286 A24 DYIKADGQNI * 162-171 4.500 90.0171313005218 A24 SYFTFQLQNI * 202-211 4.090 59.7398917041452 A DLSK-KTLLR 311-319 3.300 27.1126389206579 A68.1 TVEY-ELKYR * 42-50 5.300 200.336809974792 A68.1 TVEY-ELKYR * 41-50 4.600 99.4843156419338 A68.1 ETWK-TIITK * 55-63 4.500 90.0171313005218 A68.1 CVNG-SSENK * 189-197 4.790 120.301368663215 A68.1 FTFQLQNIVK * 204-213 4.090 59.7398917041452 A68.1 FTRESSCEIK 222-231 3.400 29.964100047397 A68.1 ESSC-EIKLK 225-233 3.300 27.1126389206579 A68.1 TVENETYTLK * 263-272 4.790 120.301368663215 A68.1 YTLKTTNETR * 269-278 4.600 99.4843156419338 A68.1 ETRQLCFVVR * 276-285 5.010 149.904736149047 B7 DPGYLGYLYL 18-27 4.390 80.640418980477 B7 CVYY-NWQYL 121-129 3.000 20.0855369231877 B7 GVLLDTNYNL 138-147 3.000 20.0855369231877 B7 IVKPLPPVYL 211-220 3.410 30.2652442594001 B7 EIRE-DDTTL 251-259 3.690 40.0448469572867 B8_8mer EAKIHTLL 78-85 3.470 32.1367424447532 B8_8mer EIKLKWSI 229-236 3.690 40.0448469572867 B8_8mer VVRSKVNI 283-290 3.000 20.0855369231877 B14 QNIGCRFPYL 169-178 3.400 29.964100047397 B14 IRSSYFTFQL 199-208 3.000 20.0855369231877 B_2702 LQWQ-PPLSL 27-35 3.410 30.2652442594001 B_2702 WQPPLSLDHF 29-38 3.000 20.0855369231877 B_2702 YRNI-GSETW 49-57 4.610 100.484149636389 B_2702 VQSSWAETTY 95-104 3.000 20.0855369231877 B_2702 VQDM-DCVYY 116-124 3.000 20.0855369231877 B_2702 GQNIGCRFPY 168-177 3.000 20.0855369231877 B_2702 CRFP-YLEAS 173-181 3.920 50.4004447780655 B_2702 IRSSYFTFQL 199-208 4.100 60.340287597362 B_2702 TRESSCEIKL 223-232 4.100 60.340287597362 B_2702 ARCFDYEIEI 243-252 4.100 60.340287597362 B_2702 IRED-DTTLV 252-260 3.000 20.0855369231877 B_2702 VRSK-VNIYC 284-292 3.000 20.0855369231877 B_2705 FEIV-DPGYL 14-22 3.400 29.964100047397 B_2705 YLYLQWQPPL 24-33 5.010 149.904736149047 B_2705 LQWQ-PPLSL 27-35 6.910 1002.24724229025 B_2705 LQWQ-PPLSL 26-35 3.400 29.964100047397 B_2705 WQPPLSLDHF 29-38 4.610 100.484149636389 B_2705 KECT-VEYEL 39-47 4.500 90.0171313005218 B_2705 YRNIGSETWK 49-58 7.600 1998.19589510412 B_2705 RNIG-SETWK 50-58 4.090 59.7398917041452 B_2705 SETWKTIITK 54-63 3.400 29.964100047397 B_2705 KNLH-YKDGF 63-71 3.400 29.964100047397 B_2705 NLHYKDGFDL 64-73 3.400 29.964100047397 B_2705 IEAK-IHTLL 77-85 3.400 29.964100047397 B_2705 WQCT-NGSEV 87-95 4.100 60.340287597362 B_2705 VQSSWAETTY 95-104 4.610 100.484149636389 B_2705 VQDM-DCVYY 116-124 4.610 100.484149636389 B_2705 CVYY-NWQYL 121-129 3.910 49.8989519734079 B_2705 WQYL-LCSWK 126-134 6.910 1002.24724229025 B_2705 CSWKPGIGVL 131-140 3.910 49.8989519734079 B_2705 VLLD-TNYNL 139-147 3.400 29.964100047397 B_2705 TNYN-LFYWY 143-151 3.910 49.8989519734079 B_2705 NLFY-WYEGL 146-154 5.010 149.904736149047 B_2705 ALQC-VDYIK 157-165 3.400 29.964100047397 B_2705 LQCV-DYIKA 158-166 3.000 20.0855369231877 B_2705 GQNIGCRFPY 168-177 4.610 100.484149636389 B_2705 CRFP-YLEAS 173-181 6.910 1002.24724229025 B_2705 FPYLEASDYK 175-184 3.910 49.8989519734079 B_2705 IRSSYFTFQL 199-208 7.600 1998.19589510412 B_2705 RSSY-FTFQL 200-208 3.400 29.964100047397 B_2705 FTFQLQNIVK 204-213 3.910 49.8989519734079 B_2705 FQLQNIVKPL 206-215 4.100 60.340287597362 B_2705 TRES-SCEIK 223-231 7.600 1998.19589510412 B_2705 RESS-CEIKL 224-232 4.500 90.0171313005218 B_2705 ARCFDYEIEI 243-252 6.400 601.845037872082 B_2705 RCFDYEIEIR 244-253 4.320 75.1886282920231 B_2705 IRED-DTTLV 252-260 6.400 601.845037872082 B_2705 IEIREDDTTL 250-259 3.400 29.964100047397 B_2705 VENE-TYTLK 264-272 3.400 29.964100047397 B_2705 TRQL-CFVVR 277-285 6.910 1002.24724229025 B_2705 RQLCFVVRSK 278-287 5.200 181.272241875151 B_2705 VRSK-VNIYC 284-292 5.300 200.336809974792 B_2705 GIWS-EWSDS 296-304 3.910 49.8989519734079 B_2705 KQCW-EGEDL 304-312 6.400 601.845037872082 B_2705 QCWEGEDLSK 305-314 3.910 49.8989519734079 B_2705 WEGE-DLSKK 307-315 3.400 29.964100047397 B_2705 GEDLSKKTLL 309-318 3.400 29.964100047397 B_3501 DPGY-LGYLY 18-26 3.700 40.4473043600674 B_3501 QPPL-SLDHF 30-38 3.000 20.0855369231877 B_3501 FPYL-EASDY 175-183 4.110 60.9467175696222 B_3501 KPIRSSYFTF 197-206 3.690 40.0448469572867 B_3501 KPLPPVYLTF 213-222 3.690 40.0448469572867 B_3501 GPIPARCFDY 239-248 3.700 40.4473043600674

B3501_8mer DPGYLGYL 18-25 3.000 20.0855369231877 B3501_8mer KPGIGVLL 134-141 3.690 40.0448469572867 B3501_8mer KPIRSSYF 197-204 3.690 40.0448469572867 B3501_8mer KPLPPVYL 213-220 3.690 40.0448469572867 B3501_8mer LPPVYLTF 215-222 3.000 20.0855369231877 B3501_8mer GPIPARCF 239-246 3.000 20.0855369231877 B3501_8mer IPARCFDY 241-248 3.700 40.4473043600674 B_3701 VDPG-YLGYL 17-25 3.690 40.0448469572867 B_3701 KDGFDLNKGI 68-77 3.690 40.04484695272867 B_3701 IEAK-IHTLL 77-85 4.320 75.1886282920231 B_3701 LDTN-YNLFY 141-149 3.690 40.0448469572867 B_3701 EDLS-KKTLL 310-318 5.300 200.336809974792 B_3701 EDLS-KKTLL 309-318 3.910 49.8989519734079 B LHYK-DGFDL 65-73 3.400 29.964100047397 B_3901 LHYK-DGFDL 65-73 5.190 179.468552931832 B_3901 DHALQCVDYI 155-164 3.810 45.1504388663187 B_3901 TRESSCEIKL 223-232 3.120 22.6463796431754 B_3901 IRED-DTTLV 252-260 3.400 29.964100047397 B3901_8mer DHFKECTV 36-43 4.090 59.7398917041452 B3901_8mer IREDDTTL 252-259 4.500 90.0171313005218 B_3902 LQWQ-PPLSL 27-35 3.000 20.0855369231877 B_3902 FKECTVEYEL 38-47 3.180 24.046753520645 B_3902 WKTI-ITKNEL 57-65 3.180 24.0467535520645 B_3902 WKPG-IGVLL 133-141 3.180 24.0467535520645 B_3902 FQLQNIVKPL 206-215 3.180 24.0467535520645 B_3902 VKPL-PPVYL 212-220 3.000 20.0855369231877 B_3902 IKLK-WSIPL 230-238 3.180 24.0467535520645 B_3902 LKTTNETRQL 271-280 3.000 20.0855369231877 B_3902 KQCW-EGEDL 304-312 3.000 20.0855369231877 B_3902 DKQCWEGEDLY 303-312 3.000 20.0855369231877 B40 FEIV-DPGYL 14-22 4.390 80.640418980477 B40 KECT-VEYEL 39-47 3.000 20.0855369231877 B40 IEAK-IHTLL 77-85 3.690 40.0448469572867 B40 RESS-CEIKL 224-232 3.000 20.0855369231877 B40 IEIREDDTTL 250-259 4.390 80.640418980477 B40 SEWS-DKQCW 299-307 3.690 40.0448469572867 B40 GEDL-SKKTL 309-317 3.000 20.0855369231877 B_4403 QDFEIVDPGY 12-21 3.120 22.6463796431754 B_4403 FEIV-DPGYL 14-22 3.000 20.0855369231877 B_4403 VDPGYLGYLY 17-26 3.210 22.6463796431754 B_4403 KTIITKNLHY 58-67 3.530 34.1239676147544 B_4403 QNIG-CRFPY 169-177 3.530 34.1239676147544 B_4403 LEASDYKDFY 178-187 5.480 239.846707374255 B_4403 SENKPIRSSY 194-203 5.480 239.846707374255 B_4403 CEIK-LKWSI 228-236 3.000 20.0855369231877 B_4403 GPIPARCFDY 239-248 3.810 45.1504388663187 B_4403 YEIEIREDDT 248-257 3.000 20.0855369231877 B_4403 IEIREDDTTL 250-259 3.410 30.2652442594001 B_4403 SEWS-DKQCW 299-307 3.180 24.0467535520645 B_5101 NPPQ-DFEIV 9-17 5.410 223.631587680546 B_5101 DPGYLGYLYL 18-27 5.400 221.406416204187 B_5101 IGSE-TWKTI 52-60 5.050 156.022464486395 B_5101 DGFD-LNKGI 69-77 6.070 432.680681574476 B_5101 SPQGIPETKV 107-116 5.410 223.631587680546 B_5101 IPET-KVQDM 111-119 3.770 43.3800648358516 B_5101 EGLDHALQCV 152-161 4.790 120.3013686632215 B_5101 HALQ-CVDYI 156-164 5.300 200.336809974792 B_5101 EASDYKDFYI 179-188 6.090 441.421411145971 B_5101 NGSS-ENKPI 191-199 4.590 98.4944301619463 B_5101 IPARCFDYEI 241-250 6.260 523.218940108001 B_5101 PARC-FDYEI 242-250 3.000 20.0855369231877 B_5101 EGEDLSKKTL 308-317 4.190 66.0227909604099 B5101_8mer NPPQDFEI 9-16 6.100 445.857770082517 B5101_8mer PPQDFEIV 10-17 3.110 22.4210444007463 B5101_8mer DPGYLGYL 18-25 5.300 200.336809974792 B5101_8mer EAKIHTLL 78-85 4.700 109.947172452124 B5101_8mer WAETTYWI 99-106 5.400 221.406416204187 B5101_8mer QGIPETKV 109-116 3.800 44.7011844933008 B5101_8mer KPGIGVLL 134-141 4.120 61.5592422644285 B5101_8mer IGCRFPYL 171-178 3.260 26.0495371425183 B5101_8mer KPLPPVYL 213-220 3.920 50.4004447780655 B_5102 NPPQ-DFEIV 9-7 5.510 247.151127067624 B_5102 DPGYLGYLYL 18-27 4.810 122.731617517265 B_5102 IGSE-TWKTI 52-60 4.790 120.301368663215 B_5102 DGFD-LNKGI 69-77 6.200 592.749041093256 B_5102 KGIEAKIHTL 75-84 4.400 81.4508686649681 B_5102 LPWQ-CTNGS 85-93 3.430 30.876642749677 B_5102 SSWAETTYWI 97-106 3.200 24.5325301971094 B_5102 TYWI-SPQGI 103-111 3.100 22.1979512814416 B_5102 TTYWISPOGI 102-111 3.100 22.1979512814416 B_5102 SPQGIPETKV 107-116 6.100 445.857770082517 B_5102 YLLCSWKPGI 128-137 3.180 24.0467535520645 B_5102 EGLDHALQCV 152-161 4.900 134.289779684936 B_5102 HALQ-CVDYI 156-164 6.600 735.095189241973 B_5102 FPYL-EASDY 175-183 3.510 33.4482677839449 B_5102 EASDYKDFYI 179-188 5.400 221.406416204187 B_5102 NGSS-ENKPI 191-199 4.590 98.4944301619463 B_5102 KPIR-SSYFT 197-205 3.510 33.4482677839449 B_5102 SYFTFQLQNI 202-211 3.300 27.1126389206579 B_5102 FTFQ-LQNIV 204-212 3.200 24.5325301971094 B_5102 KPLP-PVYLT 213-221 3.410 30.2652442594001 B_5102 IPLGPIPARC 236-245 4.200 66.6863310409252 B_5102 IPARCFDYEI 241-250 6.100 445.857770082517 B_5102 RCFD-YEIEI 244-252 3.000 20.0855369231877 B_5102 FVVR-SKVNI 282-290 3.280 26.575772699874 B_5102 LCF-VRSKV 280-288 3.100 22.1979512814416 B_5102 NIYC-SDDGI 289-297 3.000 20.0855369231877 B5102_8mer NPPQDFEI 9-16 6.200 492.749041093256 B5102_8mer PPQDFEIV 10-17 3.010 20.2873999252409 B5102_8mer DPGYLGYL 18-25 4.610 100.484149636389 B5102_8mer EAKIHTLL 78-85 3.320 27.6603505585167 B5102_8mer WAETTYWI 99-106 4.810 122.731617517265 B5102_8mer YWISPQGI 104-111 3.280 26.575772699874 B5102_8mer QGIPETKV 109-116 5.000 148.413159102577 B5102_8mer KPGIGVLL 134-141 4.710 111.052159905699 B5102_8mer IGCRFPYL 171-178 3.100 22.1979512814416 B5102_8mer FTFQLQNI 204-211 3.890 48.9108865237319 B5102_8mer KPLPPVYL 213-220 5.710 301.87106828279 B5102_8mer IPLGPIPA 236-243 3.610 36.9660528148225 B_5103 NPPQ-DFEIV 9-17 3.800 44.7011844933008 B_5103 IGSETWKTII 52-61 3.900 49.4024491055302 B_5103 DGFD-LNKGI 69-77 3.980 53.5170342274912 B_5103 SPQGIPETKV 107-116 3.800 44.7011844933008 B_5103 EGLDHALQCV 152-161 3.980 53.5170342274912 B_5103 HALQ-CVDYI 156-164 4.890 132.953574051283 B_5103 EASDYKDFYI 179-188 4.610 100.484149636389 B_5103 NGSS-ENKPI 191-199 3.700 40.4473043600674 B_5103 IPARCFDYEI 241-250 3.800 44.7011844933008 B_5201 NPPQ-DFEIV 9-17 4.700 109.947172452124 B_5201 NPPQ-DFEIV 8-17 3.680 39.6463940725726 B_5201 IGSETWKTII 52-61 4.600 99.4843156419338 B_5201 DGFD-LNKGI 69-77 4.110 60.9467175696222 B_5201 FTFQ-LQNIV 204-212 4.600 99.4843156419338 B_5801 KTIITKNLHY 58-67 3.000 20.0855369231877 B_5801 SSWA-ETTYW 97-105 4.390 80.640418980477

B_5801 QSSWAETTYW 96-105 4.390 80.640418980477 B_5801 DTNY-NLFYW 142-150 3.370 29.0785270577971 B_5801 KPLPPVYLTF 213-222 3.100 22.1979512814416 B_5801 SSCE-IKLKW 226-234 5.690 295.893620640484 B_5801 SSCE-IKLKW 225-234 3.800 44.7011844933008 B_5801 TTNETRQLCF 273-282 4.490 89.1214458786587 B_5801 CSDDGIWSEW 292-301 4.900 134.289779684936 B_5801 WSEWSDKQCW 298-307 4.390 80.640418980477 B60 FEIV-DPGYL 14-22 5.770 320.537732647356 B60 VDPG-YLGYL 17-25 3.000 20.0855369231877 B60 KECT-VEYEL 39-47 5.870 354.248980267765 B60 IEAK-IHTLL 77-85 5.870 354.248980267765 B60 RESS-CEIKL 224-232 6.560 706.271694595366 B60 IEIREDDTTL 250-259 5.770 320.537732647356 B60 GEDL-SKKTL 309-317 5.080 160.774055928607 B60 EDLS-KKTLL 310-318 3.690 40.0448469572867 B61 REDDTTLVTA 253-262 3.100 22.1979512814416 B61 NETR-QLCFV 275-283 4.380 79.8380334050845 B61_8mer SEVQSSWA 93-100 3.690 40.0448469572867 B61_8mer REDDTTLV 253-260 3.790 44.2564002759834 Cw_0301 FEIV-DPGYL 14-22 3.000 20.0855369231877 Cw_0301 LYLQ-WQPPL 25-33 3.000 20.0855369231877 Cw_0301 YLYLQWQPPL 24-33 3.000 20.0855369231877 Cw_0301 VEYELKYRNI 43-52 3.630 37.7128166171817 Cw_0301 LHYK-DGFDL 65-73 3.000 20.0855369231877 Cw_0301 KGIEAKIHTL 75-84 3.590 36.2340759264765 Cw_0301 CVYY-NWQYL 121-129 3.360 28.7891908792427 Cw_0301 DCVYYNWQYL 120-129 3.360 28.7891908792427 Cw_0301 VYYN-WQYLL 122-130 3.000 20.0855369231877 Cw_0301 VLLDTNYNLF 139-148 3.400 29.964100047397 Cw_0301 GVLLDTNYNL 138-147 3.000 20.0855369231877 Cw_0301 YNLFYWYEGL 145-154 3.610 100.484149636389 Cw_0301 NLFY-WYEGL 146-154 3.410 30.2652442594001 Cw_0301 QNIGCRFPYL 169-178 3.610 100.484149636389 Cw_0301 KPIRSSYFTF 197-206 3.810 45.1504388663187 Cw_0301 FQLQNIVKPL 206-215 3.180 24.0467535520645 Cw_0301 KPLPPVYLTF 213-222 5.010 149.904736149047 Cw_0301 IKLK-WSIPL 230-238 3.000 20.0855369231877 Cw_0301 ATVENETYTL 262-271 3.590 36.2340759264765 Cw_0401 DFEIVDPGYL 13-22 5.300 200.336809974792 Cw_0401 DPGYLGYLYL 18-27 4.390 80.640418980477 Cw_0401 LYLQ-WQPPL 25-33 5.300 200.336809974792 Cw_0401 QPPL-SLDHF 30-38 4.490 89.1214458786587 Cw_0401 HFKE-CTVEY 37-45 3.400 29.964100047397 Cw_0401 EYEL-KYRNI 44-52 3.220 25.0281201813378 Cw_0401 TWKKTIITKNL 56-65 3.690 40.0448469572867 Cw_0401 TYWI-SPQGI 103-111 3.220 25.0281201813378 Cw_0401 IPET-KVQDM 111-199 4.390 80.640418980477 Cw_0401 VYYN-WQYLL 122-130 5.300 200.336809974792 Cw_0401 SWKP-GIGVL 132-140 4.560 95.5834798300662 Cw_0401 WYEG-LDHAL 150-158 5.300 200.336809974792 Cw_0401 WYEG-LDHAL 149-158 3.870 47.9423860808193 Cw_0401 DYIKADGQNI 162-171 3.220 25.0281201813378 Cw_0401 RFPYLEASDY 174-183 3.220 25.0281201813378 Cw_0401 DYKD-FYICV 182-190 3.400 29.964100047397 Cw_0401 KPIRSSYFTF 197-206 3.700 40.4473043600674 Cw_0401 YFTF-QLQNI 203-211 3.910 49.8989519734079 Cw_0401 SYFTFQLQNI 202-211 3.910 49.8989519734079 Cw_0401 KPLPPVYLTF 213-222 3.880 48.4242150713452 Cw_0401 TFTRESSCEI 221-230 3.220 25.0281201813378 Cw_0401 CFVVRSKVNI 281-290 3.220 25.0281201813378 Cw_0702 DPGY-LGYLY 18-26 3.870 47.9423860808193 Cw_0702 DPGY-LGYLY 17-26 3.460 31.8169765146677 * = high stringency

Example 4

Protein and Nucleic Acid Vaccines Prevent The Development of Tumors

[0109] The effect of an antibody-based immune response against cells expressing IL-13Rα2 was examined. An immunocompetent syngeneic murine glioma model that expresses IL-13Rα2 was established. G-26 murine glioma cells were stably transfected with hIL-13Rα2 and were shown to contain the IL-13 binding characteristics of human HGGs. Furthermore, tumors grown from these IL-13Rα2(+) cells immunocompetent C57BL/J6 mice maintained the HGG restricted IL-13 binding properties, validating this model. Immunocompetent C57BL/J6 mice were injected with affinity-purified extracellular domain of IL-13Rα2 recombinant protein domain [6×(His)-(factor X restriction site)-IL13-Rα2 (amino acids 27-343)] produced in E. coli. together with Freund's Complete adjuvant or Freund's adjuvant alone (10 male mice per/group, age 10 weeks). Mice were vaccinated every 2 weeks for a total of 3 times. Three weeks after the last vaccination, a substantial load of G-26-hIL-13Rα2(+) tumor cells (5×10⁶ cells) were implanted subcutaneously into the vaccinated mice and the controls. Tumors appeared 16 days post tumor cells injection in the control groups but not in the IL-13Rα2 vaccinated group (FIG. 1A). Additionally, mice vaccinated with recombinant IL-13Rα2 manifested a strong specific antibody response against IL-13Rα2 as demonstrated by enzyme-linked immunosorbent assay (ELISA).

[0110] Anti-tumor responses by the cell-mediated branch of the immune system were also examined. A plasmid containing IL-13Rα2 under the CMV promoter, pcDNA3.1/IL13Rα2, or pcDNA3.1 alone was attached to gold particles and used to vaccinate mice via gene gun (10 mice/group) (Vaccine 18:2937-2944; 2000). Mice were immunized every two weeks for a total of 3 times. Three weeks after the last immunization, mice were injected subcutaneously with 5×10⁶ G-26-IL-13Rα2(+) murine glioma cells. Tumors appeared 16 days after tumor cell injection only in mice vaccinated with pcDNA 3.1 vector alone but no tumors were visible in mice vaccinated with pcDNA 3.1/Rα2 (FIG. 1B).

Other Embodiments

[0111] This description has been by way of example of how the compositions and methods of invention can be made and carried out. Those of ordinary skill in the art will recognize that various details may be modified in arriving at the other detailed embodiments, and that many of these embodiments will come within the scope of the invention. Therefore, to apprise the public of the scope of the invention and the embodiments covered by the invention, the following claims are made.

Sequence CWU 1

3171380PRTHomo sapiens 1Met Ala Phe Val Cys Leu Ala Ile Gly Cys Leu Tyr Thr Phe Leu Ile1 5 10 15Ser Thr Thr Phe Gly Cys Thr Ser Ser Ser Asp Thr Glu Ile Lys Val 20 25 30Asn Pro Pro Gln Asp Phe Glu Ile Val Asp Pro Gly Tyr Leu Gly Tyr 35 40 45Leu Tyr Leu Gln Trp Gln Pro Pro Leu Ser Leu Asp His Phe Lys Glu 50 55 60Cys Thr Val Glu Tyr Glu Leu Lys Tyr Arg Asn Ile Gly Ser Glu Thr65 70 75 80Trp Lys Thr Ile Ile Thr Lys Asn Leu His Tyr Lys Asp Gly Phe Asp 85 90 95Leu Asn Lys Gly Ile Glu Ala Lys Ile His Thr Leu Leu Pro Trp Gln 100 105 110Cys Thr Asn Gly Ser Glu Val Gln Ser Ser Trp Ala Glu Thr Thr Tyr 115 120 125Trp Ile Ser Pro Gln Gly Ile Pro Glu Thr Lys Val Gln Asp Met Asp 130 135 140Cys Val Tyr Tyr Asn Trp Gln Tyr Leu Leu Cys Ser Trp Lys Pro Gly145 150 155 160Ile Gly Val Leu Leu Asp Thr Asn Tyr Asn Leu Phe Tyr Trp Tyr Glu 165 170 175Gly Leu Asp His Ala Leu Gln Cys Val Asp Tyr Ile Lys Ala Asp Gly 180 185 190Gln Asn Ile Gly Cys Arg Phe Pro Tyr Leu Glu Ala Ser Asp Tyr Lys 195 200 205Asp Phe Tyr Ile Cys Val Asn Gly Ser Ser Glu Asn Lys Pro Ile Arg 210 215 220Ser Ser Tyr Phe Thr Phe Gln Leu Gln Asn Ile Val Lys Pro Leu Pro225 230 235 240Pro Val Tyr Leu Thr Phe Thr Arg Glu Ser Ser Cys Glu Ile Lys Leu 245 250 255Lys Trp Ser Ile Pro Leu Gly Pro Ile Pro Ala Arg Cys Phe Asp Tyr 260 265 270Glu Ile Glu Ile Arg Glu Asp Asp Thr Thr Leu Val Thr Ala Thr Val 275 280 285Glu Asn Glu Thr Tyr Thr Leu Lys Thr Thr Asn Glu Thr Arg Gln Leu 290 295 300Cys Phe Val Val Arg Ser Lys Val Asn Ile Tyr Cys Ser Asp Asp Gly305 310 315 320Ile Trp Ser Glu Trp Ser Asp Lys Gln Cys Trp Glu Gly Glu Asp Leu 325 330 335Ser Lys Lys Thr Leu Leu Arg Phe Trp Leu Pro Phe Gly Phe Ile Leu 340 345 350Ile Leu Val Ile Phe Val Thr Gly Leu Leu Leu Arg Lys Pro Asn Thr 355 360 365Tyr Pro Lys Met Ile Pro Glu Phe Phe Cys Asp Thr 370 375 38021298PRTHomo sapiens 2Gly Gly Thr Gly Cys Cys Thr Gly Thr Cys Gly Gly Cys Gly Gly Gly1 5 10 15Gly Ala Gly Ala Gly Ala Gly Gly Cys Ala Ala Thr Ala Thr Cys Ala 20 25 30Ala Gly Gly Thr Thr Thr Thr Ala Ala Ala Thr Cys Thr Cys Gly Gly 35 40 45Ala Gly Ala Ala Ala Thr Gly Gly Cys Thr Thr Thr Cys Gly Thr Thr 50 55 60Thr Gly Cys Thr Thr Gly Gly Cys Thr Ala Thr Cys Gly Gly Ala Thr65 70 75 80Gly Cys Thr Thr Ala Thr Ala Thr Ala Cys Cys Thr Thr Thr Cys Thr 85 90 95Gly Ala Thr Ala Ala Gly Cys Ala Cys Ala Ala Cys Ala Thr Thr Thr 100 105 110Gly Gly Cys Thr Gly Thr Ala Cys Thr Thr Cys Ala Thr Cys Thr Thr 115 120 125Cys Ala Gly Ala Cys Ala Cys Cys Gly Ala Gly Ala Thr Ala Ala Ala 130 135 140Ala Gly Thr Thr Ala Ala Cys Cys Cys Thr Cys Cys Thr Cys Ala Gly145 150 155 160Gly Ala Thr Thr Thr Thr Gly Ala Gly Ala Thr Ala Gly Thr Gly Gly 165 170 175Ala Thr Cys Cys Cys Gly Gly Ala Thr Ala Cys Thr Thr Ala Gly Gly 180 185 190Thr Thr Ala Thr Cys Thr Cys Thr Ala Thr Thr Thr Gly Cys Ala Ala 195 200 205Thr Gly Gly Cys Ala Ala Cys Cys Cys Cys Cys Ala Cys Thr Gly Thr 210 215 220Cys Thr Cys Thr Gly Gly Ala Thr Cys Ala Thr Thr Thr Thr Ala Ala225 230 235 240Gly Gly Ala Ala Thr Gly Cys Ala Cys Ala Gly Thr Gly Gly Ala Ala 245 250 255Thr Ala Thr Gly Ala Ala Cys Thr Ala Ala Ala Ala Thr Ala Cys Cys 260 265 270Gly Ala Ala Ala Cys Ala Thr Thr Gly Gly Thr Ala Gly Thr Gly Ala 275 280 285Ala Ala Cys Ala Thr Gly Gly Ala Ala Gly Ala Cys Cys Ala Thr Cys 290 295 300Ala Thr Thr Ala Cys Thr Ala Ala Gly Ala Ala Thr Cys Thr Ala Cys305 310 315 320Ala Thr Thr Ala Cys Ala Ala Ala Gly Ala Thr Gly Gly Gly Thr Thr 325 330 335Thr Gly Ala Thr Cys Thr Thr Ala Ala Cys Ala Ala Gly Gly Gly Cys 340 345 350Ala Thr Thr Gly Ala Ala Gly Cys Gly Ala Ala Gly Ala Thr Ala Cys 355 360 365Ala Cys Ala Cys Gly Cys Thr Thr Thr Thr Ala Cys Cys Ala Thr Gly 370 375 380Gly Cys Ala Ala Thr Gly Cys Ala Cys Ala Ala Ala Thr Gly Gly Ala385 390 395 400Thr Cys Ala Gly Ala Ala Gly Thr Thr Cys Ala Ala Ala Gly Thr Thr 405 410 415Cys Cys Thr Gly Gly Gly Cys Ala Gly Ala Ala Ala Cys Thr Ala Cys 420 425 430Thr Thr Ala Thr Thr Gly Gly Ala Thr Ala Thr Cys Ala Cys Cys Ala 435 440 445Cys Ala Ala Gly Gly Ala Ala Thr Thr Cys Cys Ala Gly Ala Ala Ala 450 455 460Cys Thr Ala Ala Ala Gly Thr Thr Cys Ala Gly Gly Ala Thr Ala Thr465 470 475 480Gly Gly Ala Thr Thr Gly Cys Gly Thr Ala Thr Ala Thr Thr Ala Cys 485 490 495Ala Ala Thr Thr Gly Gly Cys Ala Ala Thr Ala Thr Thr Thr Ala Cys 500 505 510Thr Cys Thr Gly Thr Thr Cys Thr Thr Gly Gly Ala Ala Ala Cys Cys 515 520 525Thr Gly Gly Cys Ala Thr Ala Gly Gly Thr Gly Thr Ala Cys Thr Thr 530 535 540Cys Thr Thr Gly Ala Thr Ala Cys Cys Ala Ala Thr Thr Ala Cys Ala545 550 555 560Ala Cys Thr Thr Gly Thr Thr Thr Thr Ala Cys Thr Gly Gly Thr Ala 565 570 575Thr Gly Ala Gly Gly Gly Cys Thr Thr Gly Gly Ala Thr Cys Ala Thr 580 585 590Gly Cys Ala Thr Thr Ala Cys Ala Gly Thr Gly Thr Gly Thr Thr Gly 595 600 605Ala Thr Thr Ala Cys Ala Thr Cys Ala Ala Gly Gly Cys Thr Gly Ala 610 615 620Thr Gly Gly Ala Cys Ala Ala Ala Ala Thr Ala Thr Ala Gly Gly Ala625 630 635 640Thr Gly Cys Ala Gly Ala Thr Thr Thr Cys Cys Cys Thr Ala Thr Thr 645 650 655Thr Gly Gly Ala Gly Gly Cys Ala Thr Cys Ala Gly Ala Cys Thr Ala 660 665 670Thr Ala Ala Ala Gly Ala Thr Thr Thr Cys Thr Ala Thr Ala Thr Thr 675 680 685Thr Gly Thr Gly Thr Thr Ala Ala Thr Gly Gly Ala Thr Cys Ala Thr 690 695 700Cys Ala Gly Ala Gly Ala Ala Cys Ala Ala Gly Cys Cys Thr Ala Thr705 710 715 720Cys Ala Gly Ala Thr Cys Cys Ala Gly Thr Thr Ala Thr Thr Thr Cys 725 730 735Ala Cys Thr Thr Thr Thr Cys Ala Gly Cys Thr Thr Cys Ala Ala Ala 740 745 750Ala Thr Ala Thr Ala Gly Thr Thr Ala Ala Ala Cys Cys Thr Thr Thr 755 760 765Gly Cys Cys Gly Cys Cys Ala Gly Thr Cys Thr Ala Thr Cys Thr Thr 770 775 780Ala Cys Thr Thr Thr Thr Ala Cys Thr Cys Gly Gly Gly Ala Gly Ala785 790 795 800Gly Thr Thr Cys Ala Thr Gly Thr Gly Ala Ala Ala Thr Thr Ala Ala 805 810 815Gly Cys Thr Gly Ala Ala Ala Thr Gly Gly Ala Gly Cys Ala Thr Ala 820 825 830Cys Cys Thr Thr Thr Gly Gly Gly Ala Cys Cys Thr Ala Thr Thr Cys 835 840 845Cys Ala Gly Cys Ala Ala Gly Gly Thr Gly Thr Thr Thr Thr Gly Ala 850 855 860Thr Thr Ala Thr Gly Ala Ala Ala Thr Thr Gly Ala Gly Ala Thr Cys865 870 875 880Ala Gly Ala Gly Ala Ala Gly Ala Thr Gly Ala Thr Ala Cys Thr Ala 885 890 895Cys Cys Thr Thr Gly Gly Thr Gly Ala Cys Thr Gly Cys Thr Ala Cys 900 905 910Ala Gly Thr Thr Gly Ala Ala Ala Ala Thr Gly Ala Ala Ala Cys Ala 915 920 925Thr Ala Cys Ala Cys Cys Thr Thr Gly Ala Ala Ala Ala Cys Ala Ala 930 935 940Cys Ala Ala Ala Thr Gly Ala Ala Ala Cys Cys Cys Gly Ala Cys Ala945 950 955 960Ala Thr Thr Ala Thr Gly Cys Thr Thr Thr Gly Thr Ala Gly Thr Ala 965 970 975Ala Gly Ala Ala Gly Cys Ala Ala Ala Gly Thr Gly Ala Ala Thr Ala 980 985 990Thr Thr Thr Ala Thr Thr Gly Cys Thr Cys Ala Gly Ala Thr Gly Ala 995 1000 1005Cys Gly Gly Ala Ala Thr Thr Thr Gly Gly Ala Gly Thr Gly Ala 1010 1015 1020Gly Thr Gly Gly Ala Gly Thr Gly Ala Thr Ala Ala Ala Cys Ala 1025 1030 1035Ala Thr Gly Cys Thr Gly Gly Gly Ala Ala Gly Gly Thr Gly Ala 1040 1045 1050Ala Gly Ala Cys Cys Thr Ala Thr Cys Gly Ala Ala Gly Ala Ala 1055 1060 1065Ala Ala Cys Thr Thr Thr Gly Cys Thr Ala Cys Gly Thr Thr Thr 1070 1075 1080Cys Thr Gly Gly Cys Thr Ala Cys Cys Ala Thr Thr Thr Gly Gly 1085 1090 1095Thr Thr Thr Cys Ala Thr Cys Thr Thr Ala Ala Thr Ala Thr Thr 1100 1105 1110Ala Gly Thr Thr Ala Thr Ala Thr Thr Thr Gly Thr Ala Ala Cys 1115 1120 1125Cys Gly Gly Thr Cys Thr Gly Cys Thr Thr Thr Thr Gly Cys Gly 1130 1135 1140Thr Ala Ala Gly Cys Cys Ala Ala Ala Cys Ala Cys Cys Thr Ala 1145 1150 1155Cys Cys Cys Ala Ala Ala Ala Ala Thr Gly Ala Thr Thr Cys Cys 1160 1165 1170Ala Gly Ala Ala Thr Thr Thr Thr Thr Cys Thr Gly Thr Gly Ala 1175 1180 1185Thr Ala Cys Ala Thr Gly Ala Ala Gly Ala Cys Thr Thr Thr Cys 1190 1195 1200Cys Ala Thr Ala Thr Cys Ala Ala Gly Ala Gly Ala Cys Ala Thr 1205 1210 1215Gly Gly Thr Ala Thr Thr Gly Ala Cys Thr Cys Ala Ala Cys Ala 1220 1225 1230Gly Thr Thr Thr Cys Cys Ala Gly Thr Cys Ala Thr Gly Gly Cys 1235 1240 1245Cys Ala Ala Ala Thr Gly Thr Thr Cys Ala Ala Thr Ala Thr Gly 1250 1255 1260Ala Gly Thr Cys Thr Cys Ala Ala Thr Ala Ala Ala Cys Thr Gly 1265 1270 1275Ala Ala Thr Thr Thr Thr Thr Cys Thr Thr Gly Cys Gly Ala Ala 1280 1285 1290Thr Gly Thr Thr Gly 1295330DNAHomo sapiens 3aagatttgga agcttatggc tttcgtttgc 30430DNAHomo sapiens 4tccctcgaag cttcatgtat cacagaaaaa 30527DNAHomo sapiens 5attattaagc ttatggagtg gccggcg 27627DNAHomo sapiens 6taaccggaag cttcactgag aggcttt 2779PRTHomo sapiens 7Ile Val Asp Pro Gly Tyr Leu Gly Tyr1 5810PRTHomo sapiens 8Leu Leu Asp Thr Asn Tyr Asn Leu Phe Tyr1 5 10910PRTHomo sapiens 9Tyr Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 5 101010PRTHomo sapiens 10Tyr Leu Gln Trp Gln Pro Pro Leu Ser Leu1 5 10119PRTHomo sapiens 11Leu Gln Trp Gln Pro Pro Leu Ser Leu1 51210PRTHomo sapiens 12Ser Leu Asp His Phe Lys Glu Cys Thr Val1 5 101310PRTHomo sapiens 13Asn Leu His Tyr Lys Asp Gly Phe Asp Leu1 5 10149PRTHomo sapiens 14Trp Gln Cys Thr Asn Gly Ser Glu Val1 5159PRTHomo sapiens 15Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 51610PRTHomo sapiens 16Tyr Leu Leu Cys Ser Trp Lys Pro Gly Ile1 5 10179PRTHomo sapiens 17Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5189PRTHomo sapiens 18Asn Leu Phe Tyr Trp Tyr Glu Gly Leu1 5199PRTHomo sapiens 19Gly Leu Asp His Ala Leu Gln Cys Val1 5209PRTHomo sapiens 20Asn Ile Gly Cys Arg Phe Pro Tyr Leu1 52110PRTHomo sapiens 21Phe Gln Leu Gln Asn Ile Val Lys Pro Leu1 5 10229PRTHomo sapiens 22Gln Leu Gln Asn Ile Val Lys Pro Leu1 5239PRTHomo sapiens 23Asn Ile Val Lys Pro Leu Pro Pro Val1 52410PRTHomo sapiens 24Tyr Leu Thr Phe Thr Arg Glu Ser Ser Cys1 5 102510PRTHomo sapiens 25Gln Leu Cys Phe Val Val Arg Ser Lys Val1 5 102610PRTHomo sapiens 26Ile Val Asp Pro Gly Tyr Leu Gly Tyr Leu1 5 102710PRTHomo sapiens 27Tyr Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 5 10289PRTHomo sapiens 28Leu Gln Trp Gln Pro Pro Leu Ser Leu1 5299PRTHomo sapiens 29Leu Gln Trp Gln Pro Pro Leu Ser Leu1 5309PRTHomo sapiens 30Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 5319PRTHomo sapiens 31Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5329PRTHomo sapiens 32Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5339PRTHomo sapiens 33Asn Leu Phe Tyr Trp Tyr Glu Gly Leu1 53410PRTHomo sapiens 34Phe Gln Leu Gln Asn Ile Val Lys Pro Leu1 5 103510PRTHomo sapiens 35Leu Leu Asp Thr Asn Tyr Asn Leu Phe Tyr1 5 10369PRTHomo sapiens 36Ala Leu Gln Cys Val Asp Tyr Ile Lys1 5379PRTHomo sapiens 37Gly Ile Trp Ser Glu Trp Ser Asp Lys1 53810PRTHomo sapiens 38Asp Phe Glu Ile Val Asp Pro Gly Tyr Leu1 5 10399PRTHomo sapiens 39Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 5409PRTHomo sapiens 40Glu Tyr Glu Leu Lys Tyr Arg Asn Ile1 5419PRTHomo sapiens 41Thr Tyr Trp Ile Ser Pro Gln Gly Ile1 5429PRTHomo sapiens 42Val Tyr Tyr Asn Trp Gln Tyr Leu Leu1 5439PRTHomo sapiens 43Trp Tyr Glu Gly Leu Asp His Ala Leu1 54410PRTHomo sapiens 44Asp Tyr Ile Lys Ala Asp Gly Gln Asn Ile1 5 104510PRTHomo sapiens 45Ser Tyr Phe Thr Phe Gln Leu Gln Asn Ile1 5 10469PRTHomo sapiens 46Asp Leu Ser Lys Lys Thr Leu Leu Arg1 5479PRTHomo sapiens 47Thr Val Glu Tyr Glu Leu Lys Tyr Arg1 5489PRTHomo sapiens 48Thr Val Glu Tyr Glu Leu Lys Tyr Arg1 5499PRTHomo sapiens 49Glu Thr Trp Lys Thr Ile Ile Thr Lys1 5509PRTHomo sapiens 50Cys Val Asn Gly Ser Ser Glu Asn Lys1 55110PRTHomo sapiens 51Phe Thr Phe Gln Leu Gln Asn Ile Val Lys1 5 105210PRTHomo sapiens 52Phe Thr Arg Glu Ser Ser Cys Glu Ile Lys1 5 10539PRTHomo sapiens 53Glu Ser Ser Cys Glu Ile Lys Leu Lys1 55410PRTHomo sapiens 54Thr Val Glu Asn Glu Thr Tyr Thr Leu Lys1 5 105510PRTHomo sapiens 55Tyr Thr Leu Lys Thr Thr Asn Glu Thr Arg1 5 105610PRTHomo sapiens 56Glu Thr Arg Gln Leu Cys Phe Val Val Arg1 5 105710PRTHomo sapiens 57Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr Leu1 5 10589PRTHomo sapiens 58Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 55910PRTHomo sapiens 59Gly Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5 106010PRTHomo sapiens 60Ile Val Lys Pro Leu Pro Pro Val Tyr Leu1 5 10619PRTHomo sapiens 61Glu Ile Arg Glu Asp Asp Thr Thr Leu1 5628PRTHomo sapiens 62Glu Ala Lys Ile His Thr Leu Leu1 5638PRTHomo sapiens 63Glu Ile Lys Leu Lys Trp Ser Ile1 5648PRTHomo sapiens 64Val Val Arg Ser Lys Val Asn Ile1 56510PRTHomo sapiens 65Gln Asn Ile Gly Cys Arg Phe Pro Tyr Leu1 5 106610PRTHomo sapiens 66Ile Arg Ser Ser Tyr Phe Thr Phe Gln Leu1 5 10679PRTHomo sapiens 67Leu Gln Trp Gln Pro Pro Leu Ser Leu1 56810PRTHomo sapiens 68Trp Gln Pro Pro Leu Ser Leu Asp His Phe1 5 10699PRTHomo sapiens 69Tyr Arg Asn Ile Gly Ser Glu Thr Trp1 57010PRTHomo sapiens 70Val Gln Ser Ser Trp Ala Glu Thr Thr Tyr1 5 10719PRTHomo sapiens 71Val Gln Asp Met Asp Cys

Val Tyr Tyr1 57210PRTHomo sapiens 72Gly Gln Asn Ile Gly Cys Arg Phe Pro Tyr1 5 10739PRTHomo sapiens 73Cys Arg Phe Pro Tyr Leu Glu Ala Ser1 57410PRTHomo sapiens 74Ile Arg Ser Ser Tyr Phe Thr Phe Gln Leu1 5 107510PRTHomo sapiens 75Thr Arg Glu Ser Ser Cys Glu Ile Lys Leu1 5 107610PRTHomo sapiens 76Ala Arg Cys Phe Asp Tyr Glu Ile Glu Ile1 5 10779PRTHomo sapiens 77Ile Arg Glu Asp Asp Thr Thr Leu Val1 5789PRTHomo sapiens 78Val Arg Ser Lys Val Asn Ile Tyr Cys1 5799PRTHomo sapiens 79Phe Glu Ile Val Asp Pro Gly Tyr Leu1 58010PRTHomo sapiens 80Tyr Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 5 10819PRTHomo sapiens 81Leu Gln Trp Gln Pro Pro Leu Ser Leu1 5829PRTHomo sapiens 82Leu Gln Trp Gln Pro Pro Leu Ser Leu1 58310PRTHomo sapiens 83Trp Gln Pro Pro Leu Ser Leu Asp His Phe1 5 10849PRTHomo sapiens 84Lys Glu Cys Thr Val Glu Tyr Glu Leu1 58510PRTHomo sapiens 85Tyr Arg Asn Ile Gly Ser Glu Thr Trp Lys1 5 10869PRTHomo sapiens 86Arg Asn Ile Gly Ser Glu Thr Trp Lys1 58710PRTHomo sapiens 87Ser Glu Thr Trp Lys Thr Ile Ile Thr Lys1 5 10889PRTHomo sapiens 88Lys Asn Leu His Tyr Lys Asp Gly Phe1 58910PRTHomo sapiens 89Asn Leu His Tyr Lys Asp Gly Phe Asp Leu1 5 10909PRTHomo sapiens 90Ile Glu Ala Lys Ile His Thr Leu Leu1 5919PRTHomo sapiens 91Trp Gln Cys Thr Asn Gly Ser Glu Val1 59210PRTHomo sapiens 92Val Gln Ser Ser Trp Ala Glu Thr Thr Tyr1 5 10939PRTHomo sapiens 93Val Gln Asp Met Asp Cys Val Tyr Tyr1 5949PRTHomo sapiens 94Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 5959PRTHomo sapiens 95Trp Gln Tyr Leu Leu Cys Ser Trp Lys1 59610PRTHomo sapiens 96Cys Ser Trp Lys Pro Gly Ile Gly Val Leu1 5 10979PRTHomo sapiens 97Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5989PRTHomo sapiens 98Thr Asn Tyr Asn Leu Phe Tyr Trp Tyr1 5999PRTHomo sapiens 99Asn Leu Phe Tyr Trp Tyr Glu Gly Leu1 51009PRTHomo sapiens 100Ala Leu Gln Cys Val Asp Tyr Ile Lys1 51019PRTHomo sapiens 101Leu Gln Cys Val Asp Tyr Ile Lys Ala1 510210PRTHomo sapiens 102Gly Gln Asn Ile Gly Cys Arg Phe Pro Tyr1 5 101039PRTHomo sapiens 103Cys Arg Phe Pro Tyr Leu Glu Ala Ser1 510410PRTHomo sapiens 104Phe Pro Tyr Leu Glu Ala Ser Asp Tyr Lys1 5 1010510PRTHomo sapiens 105Ile Arg Ser Ser Tyr Phe Thr Phe Gln Leu1 5 101069PRTHomo sapiens 106Arg Ser Ser Tyr Phe Thr Phe Gln Leu1 510710PRTHomo sapiens 107Phe Thr Phe Gln Leu Gln Asn Ile Val Lys1 5 1010810PRTHomo sapiens 108Phe Gln Leu Gln Asn Ile Val Lys Pro Leu1 5 101099PRTHomo sapiens 109Thr Arg Glu Ser Ser Cys Glu Ile Lys1 51109PRTHomo sapiens 110Arg Glu Ser Ser Cys Glu Ile Lys Leu1 511110PRTHomo sapiens 111Ala Arg Cys Phe Asp Tyr Glu Ile Glu Ile1 5 1011210PRTHomo sapiens 112Arg Cys Phe Asp Tyr Glu Ile Glu Ile Arg1 5 101139PRTHomo sapiens 113Ile Arg Glu Asp Asp Thr Thr Leu Val1 511410PRTHomo sapiens 114Ile Glu Ile Arg Glu Asp Asp Thr Thr Leu1 5 101159PRTHomo sapiens 115Val Glu Asn Glu Thr Tyr Thr Leu Lys1 51169PRTHomo sapiens 116Thr Arg Gln Leu Cys Phe Val Val Arg1 511710PRTHomo sapiens 117Arg Gln Leu Cys Phe Val Val Arg Ser Lys1 5 101189PRTHomo sapiens 118Val Arg Ser Lys Val Asn Ile Tyr Cys1 51199PRTHomo sapiens 119Gly Ile Trp Ser Glu Trp Ser Asp Ser1 51209PRTHomo sapiens 120Lys Gln Cys Trp Glu Gly Glu Asp Leu1 512110PRTHomo sapiens 121Gln Cys Trp Glu Gly Glu Asp Leu Ser Lys1 5 101229PRTHomo sapiens 122Trp Glu Gly Glu Asp Leu Ser Lys Lys1 512310PRTHomo sapiens 123Gly Glu Asp Leu Ser Lys Lys Thr Leu Leu1 5 101249PRTHomo sapiens 124Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr1 51259PRTHomo sapiens 125Gln Pro Pro Leu Ser Leu Asp His Phe1 51269PRTHomo sapiens 126Phe Pro Tyr Leu Glu Ala Ser Asp Tyr1 512710PRTHomo sapiens 127Lys Pro Ile Arg Ser Ser Tyr Phe Thr Phe1 5 1012810PRTHomo sapiens 128Lys Pro Leu Pro Pro Val Tyr Leu Thr Phe1 5 1012910PRTHomo sapiens 129Gly Pro Ile Pro Ala Arg Cys Phe Asp Tyr1 5 101308PRTHomo sapiens 130Asp Pro Gly Tyr Leu Gly Tyr Leu1 51318PRTHomo sapiens 131Lys Pro Gly Ile Gly Val Leu Leu1 51328PRTHomo sapiens 132Lys Pro Ile Arg Ser Ser Tyr Phe1 51338PRTHomo sapiens 133Lys Pro Leu Pro Pro Val Tyr Leu1 51348PRTHomo sapiens 134Leu Pro Pro Val Tyr Leu Thr Phe1 51358PRTHomo sapiens 135Gly Pro Ile Pro Ala Arg Cys Phe1 51368PRTHomo sapiens 136Ile Pro Ala Arg Cys Phe Asp Tyr1 51379PRTHomo sapiens 137Val Asp Pro Gly Tyr Leu Gly Tyr Leu1 513810PRTHomo sapiens 138Lys Asp Gly Phe Asp Leu Asn Lys Gly Ile1 5 101399PRTHomo sapiens 139Ile Glu Ala Lys Ile His Thr Leu Leu1 51409PRTHomo sapiens 140Leu Asp Thr Asn Tyr Asn Leu Phe Tyr1 51419PRTHomo sapiens 141Glu Asp Leu Ser Lys Lys Thr Leu Leu1 51429PRTHomo sapiens 142Glu Asp Leu Ser Lys Lys Thr Leu Leu1 51439PRTHomo sapiens 143Leu His Tyr Lys Asp Gly Phe Asp Leu1 51449PRTHomo sapiens 144Leu His Tyr Lys Asp Gly Phe Asp Leu1 514510PRTHomo sapiens 145Asp His Ala Leu Gln Cys Val Asp Tyr Ile1 5 1014610PRTHomo sapiens 146Thr Arg Glu Ser Ser Cys Glu Ile Lys Leu1 5 101479PRTHomo sapiens 147Ile Arg Glu Asp Asp Thr Thr Leu Val1 51488PRTHomo sapiens 148Asp His Phe Lys Glu Cys Thr Val1 51498PRTHomo sapiens 149Ile Arg Glu Asp Asp Thr Thr Leu1 51509PRTHomo sapiens 150Leu Gln Trp Gln Pro Pro Leu Ser Leu1 515110PRTHomo sapiens 151Phe Lys Glu Cys Thr Val Glu Tyr Glu Leu1 5 1015210PRTHomo sapiens 152Trp Lys Thr Ile Ile Thr Lys Asn Glu Leu1 5 101539PRTHomo sapiens 153Trp Lys Pro Gly Ile Gly Val Leu Leu1 515410PRTHomo sapiens 154Phe Gln Leu Gln Asn Ile Val Lys Pro Leu1 5 101559PRTHomo sapiens 155Val Lys Pro Leu Pro Pro Val Tyr Leu1 51569PRTHomo sapiens 156Ile Lys Leu Lys Trp Ser Ile Pro Leu1 515710PRTHomo sapiens 157Leu Lys Thr Thr Asn Glu Thr Arg Gln Leu1 5 101589PRTHomo sapiens 158Lys Gln Cys Trp Glu Gly Glu Asp Leu1 515911PRTHomo sapiens 159Asp Lys Gln Cys Trp Glu Gly Glu Asp Leu Tyr1 5 101609PRTHomo sapiens 160Phe Glu Ile Val Asp Pro Gly Tyr Leu1 51619PRTHomo sapiens 161Lys Glu Cys Thr Val Glu Tyr Glu Leu1 51629PRTHomo sapiens 162Ile Glu Ala Lys Ile His Thr Leu Leu1 51639PRTHomo sapiens 163Arg Glu Ser Ser Cys Glu Ile Lys Leu1 516410PRTHomo sapiens 164Ile Glu Ile Arg Glu Asp Asp Thr Thr Leu1 5 101659PRTHomo sapiens 165Ser Glu Trp Ser Asp Lys Gln Cys Trp1 51669PRTHomo sapiens 166Gly Glu Asp Leu Ser Lys Lys Thr Leu1 516710PRTHomo sapiens 167Gln Asp Phe Glu Ile Val Asp Pro Gly Tyr1 5 101689PRTHomo sapiens 168Phe Glu Ile Val Asp Pro Gly Tyr Leu1 516910PRTHomo sapiens 169Val Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr1 5 1017010PRTHomo sapiens 170Lys Thr Ile Ile Thr Lys Asn Leu His Tyr1 5 101719PRTHomo sapiens 171Gln Asn Ile Gly Cys Arg Phe Pro Tyr1 517210PRTHomo sapiens 172Leu Glu Ala Ser Asp Tyr Lys Asp Phe Tyr1 5 1017310PRTHomo sapiens 173Ser Glu Asn Lys Pro Ile Arg Ser Ser Tyr1 5 101749PRTHomo sapiens 174Cys Glu Ile Lys Leu Lys Trp Ser Ile1 517510PRTHomo sapiens 175Gly Pro Ile Pro Ala Arg Cys Phe Asp Tyr1 5 1017610PRTHomo sapiens 176Tyr Glu Ile Glu Ile Arg Glu Asp Asp Thr1 5 1017710PRTHomo sapiens 177Ile Glu Ile Arg Glu Asp Asp Thr Thr Leu1 5 101789PRTHomo sapiens 178Ser Glu Trp Ser Asp Lys Gln Cys Trp1 51799PRTHomo sapiens 179Asn Pro Pro Gln Asp Phe Glu Ile Val1 518010PRTHomo sapiens 180Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr Leu1 5 101819PRTHomo sapiens 181Ile Gly Ser Glu Thr Trp Lys Thr Ile1 51829PRTHomo sapiens 182Asp Gly Phe Asp Leu Asn Lys Gly Ile1 518310PRTHomo sapiens 183Ser Pro Gln Gly Ile Pro Glu Thr Lys Val1 5 101849PRTHomo sapiens 184Ile Pro Glu Thr Lys Val Gln Asp Met1 518510PRTHomo sapiens 185Glu Gly Leu Asp His Ala Leu Gln Cys Val1 5 101869PRTHomo sapiens 186His Ala Leu Gln Cys Val Asp Tyr Ile1 518710PRTHomo sapiens 187Glu Ala Ser Asp Tyr Lys Asp Phe Tyr Ile1 5 101889PRTHomo sapiens 188Asn Gly Ser Ser Glu Asn Lys Pro Ile1 518910PRTHomo sapiens 189Ile Pro Ala Arg Cys Phe Asp Tyr Glu Ile1 5 101909PRTHomo sapiens 190Pro Ala Arg Cys Phe Asp Tyr Glu Ile1 519110PRTHomo sapiens 191Glu Gly Glu Asp Leu Ser Lys Lys Thr Leu1 5 101928PRTHomo sapiens 192Asn Pro Pro Gln Asp Phe Glu Ile1 51938PRTHomo sapiens 193Pro Pro Gln Asp Phe Glu Ile Val1 51948PRTHomo sapiens 194Asp Pro Gly Tyr Leu Gly Tyr Leu1 51958PRTHomo sapiens 195Glu Ala Lys Ile His Thr Leu Leu1 51968PRTHomo sapiens 196Trp Ala Glu Thr Thr Tyr Trp Ile1 51978PRTHomo sapiens 197Gln Gly Ile Pro Glu Thr Lys Val1 51988PRTHomo sapiens 198Lys Pro Gly Ile Gly Val Leu Leu1 51998PRTHomo sapiens 199Ile Gly Cys Arg Phe Pro Tyr Leu1 52008PRTHomo sapiens 200Lys Pro Leu Pro Pro Val Tyr Leu1 52019PRTHomo sapiens 201Asn Pro Pro Gln Asp Phe Glu Ile Val1 520210PRTHomo sapiens 202Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr Leu1 5 102039PRTHomo sapiens 203Ile Gly Ser Glu Thr Trp Lys Thr Ile1 52049PRTHomo sapiens 204Asp Gly Phe Asp Leu Asn Lys Gly Ile1 520510PRTHomo sapiens 205Lys Gly Ile Glu Ala Lys Ile His Thr Leu1 5 102069PRTHomo sapiens 206Leu Pro Trp Gln Cys Thr Asn Gly Ser1 520710PRTHomo sapiens 207Ser Ser Trp Ala Glu Thr Thr Tyr Trp Ile1 5 102089PRTHomo sapiens 208Thr Tyr Trp Ile Ser Pro Gln Gly Ile1 520910PRTHomo sapiens 209Thr Thr Tyr Trp Ile Ser Pro Gln Gly Ile1 5 1021010PRTHomo sapiens 210Ser Pro Gln Gly Ile Pro Glu Thr Lys Val1 5 1021110PRTHomo sapiens 211Tyr Leu Leu Cys Ser Trp Lys Pro Gly Ile1 5 1021210PRTHomo sapiens 212Glu Gly Leu Asp His Ala Leu Gln Cys Val1 5 102139PRTHomo sapiens 213His Ala Leu Gln Cys Val Asp Tyr Ile1 52149PRTHomo sapiens 214Phe Pro Tyr Leu Glu Ala Ser Asp Tyr1 521510PRTHomo sapiens 215Glu Ala Ser Asp Tyr Lys Asp Phe Tyr Ile1 5 102169PRTHomo sapiens 216Asn Gly Ser Ser Glu Asn Lys Pro Ile1 52179PRTHomo sapiens 217Lys Pro Ile Arg Ser Ser Tyr Phe Thr1 521810PRTHomo sapiens 218Ser Tyr Phe Thr Phe Gln Leu Gln Asn Ile1 5 102199PRTHomo sapiens 219Phe Thr Phe Gln Leu Gln Asn Ile Val1 52209PRTHomo sapiens 220Lys Pro Leu Pro Pro Val Tyr Leu Thr1 522110PRTHomo sapiens 221Ile Pro Leu Gly Pro Ile Pro Ala Arg Cys1 5 1022210PRTHomo sapiens 222Ile Pro Ala Arg Cys Phe Asp Tyr Glu Ile1 5 102239PRTHomo sapiens 223Arg Cys Phe Asp Tyr Glu Ile Glu Ile1 52249PRTHomo sapiens 224Phe Val Val Arg Ser Lys Val Asn Ile1 52258PRTHomo sapiens 225Leu Cys Phe Val Arg Ser Lys Val1 52269PRTHomo sapiens 226Asn Ile Tyr Cys Ser Asp Asp Gly Ile1 52278PRTHomo sapiens 227Asn Pro Pro Gln Asp Phe Glu Ile1 52288PRTHomo sapiens 228Pro Pro Gln Asp Phe Glu Ile Val1 52298PRTHomo sapiens 229Asp Pro Gly Tyr Leu Gly Tyr Leu1 52308PRTHomo sapiens 230Glu Ala Lys Ile His Thr Leu Leu1 52318PRTHomo sapiens 231Trp Ala Glu Thr Thr Tyr Trp Ile1 52328PRTHomo sapiens 232Tyr Trp Ile Ser Pro Gln Gly Ile1 52338PRTHomo sapiens 233Gln Gly Ile Pro Glu Thr Lys Val1 52348PRTHomo sapiens 234Lys Pro Gly Ile Gly Val Leu Leu1 52358PRTHomo sapiens 235Ile Gly Cys Arg Phe Pro Tyr Leu1 52368PRTHomo sapiens 236Phe Thr Phe Gln Leu Gln Asn Ile1 52378PRTHomo sapiens 237Lys Pro Leu Pro Pro Val Tyr Leu1 52388PRTHomo sapiens 238Ile Pro Leu Gly Pro Ile Pro Ala1 52399PRTHomo sapiens 239Asn Pro Pro Gln Asp Phe Glu Ile Val1 524010PRTHomo sapiens 240Ile Gly Ser Glu Thr Trp Lys Thr Ile Ile1 5 102419PRTHomo sapiens 241Asp Gly Phe Asp Leu Asn Lys Gly Ile1 524210PRTHomo sapiens 242Ser Pro Gln Gly Ile Pro Glu Thr Lys Val1 5 1024310PRTHomo sapiens 243Glu Gly Leu Asp His Ala Leu Gln Cys Val1 5 102449PRTHomo sapiens 244His Ala Leu Gln Cys Val Asp Tyr Ile1 524510PRTHomo sapiens 245Glu Ala Ser Asp Tyr Lys Asp Phe Tyr Ile1 5 102469PRTHomo sapiens 246Asn Gly Ser Ser Glu Asn Lys Pro Ile1 524710PRTHomo sapiens 247Ile Pro Ala Arg Cys Phe Asp Tyr Glu Ile1 5 102489PRTHomo sapiens 248Asn Pro Pro Gln Asp Phe Glu Ile Val1 52499PRTHomo sapiens 249Asn Pro Pro Gln Asp Phe Glu Ile Val1 525010PRTHomo sapiens 250Ile Gly Ser Glu Thr Trp Lys Thr Ile Ile1 5 102519PRTHomo sapiens 251Asp Gly Phe Asp Leu Asn Lys Gly Ile1 52529PRTHomo sapiens 252Phe Thr Phe Gln Leu Gln Asn Ile Val1 525310PRTHomo sapiens 253Lys Thr Ile Ile Thr Lys Asn Leu His Tyr1 5 102549PRTHomo sapiens 254Ser Ser Trp Ala Glu Thr Thr Tyr Trp1 525510PRTHomo sapiens 255Gln Ser Ser Trp Ala Glu Thr Thr Tyr Trp1 5 102569PRTHomo sapiens 256Asp Thr Asn Tyr Asn Leu Phe Tyr Trp1 525710PRTHomo sapiens 257Lys Pro Leu Pro Pro Val Tyr Leu Thr Phe1 5 102589PRTHomo sapiens 258Ser Ser Cys Glu Ile Lys Leu Lys Trp1 52599PRTHomo sapiens 259Ser Ser Cys Glu Ile Lys Leu Lys Trp1 526010PRTHomo sapiens 260Thr Thr Asn Glu Thr Arg Gln Leu Cys Phe1 5 1026110PRTHomo sapiens 261Cys Ser Asp Asp Gly Ile Trp Ser Glu Trp1 5 1026210PRTHomo sapiens 262Trp Ser Glu Trp Ser Asp Lys Gln Cys Trp1 5 102639PRTHomo sapiens 263Phe Glu Ile Val Asp Pro Gly Tyr Leu1 52649PRTHomo sapiens 264Val Asp Pro Gly Tyr Leu Gly Tyr Leu1 52659PRTHomo sapiens 265Lys Glu Cys Thr Val Glu Tyr Glu Leu1 52669PRTHomo sapiens 266Ile Glu Ala Lys Ile His Thr Leu Leu1 52679PRTHomo sapiens 267Arg Glu Ser Ser Cys Glu Ile Lys Leu1 526810PRTHomo sapiens 268Ile Glu Ile Arg Glu Asp Asp Thr Thr Leu1 5 102699PRTHomo sapiens 269Gly Glu Asp Leu Ser Lys Lys Thr Leu1 52709PRTHomo sapiens 270Glu Asp Leu Ser Lys Lys Thr Leu Leu1 527110PRTHomo sapiens 271Arg Glu Asp Asp Thr Thr Leu Val Thr Ala1 5 102729PRTHomo sapiens 272Asn Glu Thr Arg Gln Leu Cys Phe Val1 52738PRTHomo sapiens 273Ser Glu Val Gln Ser Ser Trp Ala1 52748PRTHomo sapiens 274Arg Glu Asp Asp Thr Thr Leu Val1 52759PRTHomo sapiens 275Phe Glu Ile Val Asp Pro Gly Tyr Leu1 52769PRTHomo sapiens 276Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 527710PRTHomo sapiens 277Tyr Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 5 1027810PRTHomo sapiens 278Val Glu Tyr Glu Leu Lys Tyr Arg Asn Ile1 5 102799PRTHomo sapiens 279Leu His Tyr Lys Asp Gly Phe Asp Leu1 528010PRTHomo sapiens 280Lys Gly Ile Glu Ala Lys Ile His Thr Leu1 5 102819PRTHomo sapiens 281Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 528210PRTHomo sapiens 282Asp Cys Val Tyr Tyr Asn Trp Gln Tyr Leu1 5 102839PRTHomo sapiens 283Val Tyr Tyr Asn Trp Gln Tyr Leu Leu1 528410PRTHomo sapiens 284Val Leu Leu Asp Thr Asn Tyr Asn Leu Phe1 5 1028510PRTHomo sapiens 285Gly Val Leu Leu Asp Thr Asn Tyr Asn Leu1 5

1028610PRTHomo sapiens 286Tyr Asn Leu Phe Tyr Trp Tyr Glu Gly Leu1 5 102879PRTHomo sapiens 287Asn Leu Phe Tyr Trp Tyr Glu Gly Leu1 528810PRTHomo sapiens 288Gln Asn Ile Gly Cys Arg Phe Pro Tyr Leu1 5 1028910PRTHomo sapiens 289Lys Pro Ile Arg Ser Ser Tyr Phe Thr Phe1 5 1029010PRTHomo sapiens 290Phe Gln Leu Gln Asn Ile Val Lys Pro Leu1 5 1029110PRTHomo sapiens 291Lys Pro Leu Pro Pro Val Tyr Leu Thr Phe1 5 102929PRTHomo sapiens 292Ile Lys Leu Lys Trp Ser Ile Pro Leu1 529310PRTHomo sapiens 293Ala Thr Val Glu Asn Glu Thr Tyr Thr Leu1 5 1029410PRTHomo sapiens 294Asp Phe Glu Ile Val Asp Pro Gly Tyr Leu1 5 1029510PRTHomo sapiens 295Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr Leu1 5 102969PRTHomo sapiens 296Leu Tyr Leu Gln Trp Gln Pro Pro Leu1 52979PRTHomo sapiens 297Gln Pro Pro Leu Ser Leu Asp His Phe1 52989PRTHomo sapiens 298His Phe Lys Glu Cys Thr Val Glu Tyr1 52999PRTHomo sapiens 299Glu Tyr Glu Leu Lys Tyr Arg Asn Ile1 530011PRTHomo sapiens 300Thr Trp Lys Lys Thr Ile Ile Thr Lys Asn Leu1 5 103019PRTHomo sapiens 301Thr Tyr Trp Ile Ser Pro Gln Gly Ile1 53029PRTHomo sapiens 302Ile Pro Glu Thr Lys Val Gln Asp Met1 53039PRTHomo sapiens 303Val Tyr Tyr Asn Trp Gln Tyr Leu Leu1 53049PRTHomo sapiens 304Ser Trp Lys Pro Gly Ile Gly Val Leu1 53059PRTHomo sapiens 305Trp Tyr Glu Gly Leu Asp His Ala Leu1 53069PRTHomo sapiens 306Trp Tyr Glu Gly Leu Asp His Ala Leu1 530710PRTHomo sapiens 307Asp Tyr Ile Lys Ala Asp Gly Gln Asn Ile1 5 1030810PRTHomo sapiens 308Arg Phe Pro Tyr Leu Glu Ala Ser Asp Tyr1 5 103099PRTHomo sapiens 309Asp Tyr Lys Asp Phe Tyr Ile Cys Val1 531010PRTHomo sapiens 310Lys Pro Ile Arg Ser Ser Tyr Phe Thr Phe1 5 103119PRTHomo sapiens 311Tyr Phe Thr Phe Gln Leu Gln Asn Ile1 531210PRTHomo sapiens 312Ser Tyr Phe Thr Phe Gln Leu Gln Asn Ile1 5 1031310PRTHomo sapiens 313Lys Pro Leu Pro Pro Val Tyr Leu Thr Phe1 5 1031410PRTHomo sapiens 314Thr Phe Thr Arg Glu Ser Ser Cys Glu Ile1 5 1031510PRTHomo sapiens 315Cys Phe Val Val Arg Ser Lys Val Asn Ile1 5 103169PRTHomo sapiens 316Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr1 53179PRTHomo sapiens 317Asp Pro Gly Tyr Leu Gly Tyr Leu Tyr1 5

Claims

1. A method for directing an antibody to cancer cells expressing IL-13Rα2 in a subject, the method comprising the steps of: (a) formulating a pharmaceutical composition outside of a subject, the pharmaceutical composition comprising an antibody that specifically binds IL-13Rα2 and a pharmaceutically acceptable carrier; (b) administering the pharmaceutical composition to the subject in an amount sufficient to allow the antibody to specifically bind to the cancer cells expressing IL-13Rα2 in the subject; and (c) measuring stimulation of an immune response against cancer cells expressing IL-13Rα2 in the subject after administration of the pharmaceutical composition to the subject.

2. The method of claim 1, wherein the antibody is a monoclonal antibody.

3. The method of claim 1, wherein the antibody is a polyclonal antibody.

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