WO2009093246A2 - Novel clusterin derived peptide - Google Patents

Abstract

The subject invention provides clusterin-derived peptides or homologs or derivatives thereof, pharmaceutical composition comprising them, a use thereof for therapy and for the manufacture of a medicament, a method of treating a wide range of conditions, disorders and diseases therewith, nucleotide sequences encoding them, antibodies directed to epitopes thereof and fusion proteins comprising them.

Description

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NOVEL CLUSTERIN DERIVED PEPTIDE

FIELD OF THE INVENTION This invention relates to the field of clusterin derivatives.

BACKGROUND OF THE INVENTION

Cancer cells often develop resistance to various chemotherapy agents. One of the mechanisms that contributes to such resistance is the elevation of Clusterin in its secreted form.

Clusterin (also known as CLU, Apolipoprotein J, ApoJ, testosterone repressed prostate message-2, TRPM-2, and sulfated glycoprotein-2) is a well known multifunctional, ubiquitously expressed protein that has been implicated in various cell functions including carcinogenesis and tumor progression.

Two Clusterin protein isoforms are known to be generated in human cells: a pro- apoptotic non-glycosylated nuclear form (nCLU) and a pro-survival glycosylated secreted form (sCLU) (Moretti RM, Marelli MM, Mai S, Cariboni A, Scaltriti M, Bettuzzi S, Limonta P. Clusterin isoforms differentially affect growth and motility of prostate cells: possible implications in prostate tumor igenesis. Cancer Res 2007;67(21): 10325-10333; Shannon B, Seifert M, Leskov K, Willis J, Boothman D, Tilgen W, Reichrath J. Challenge and promise: roles for clusterin in pathogenesis, progression and therapy of cancer. Cell Death Differ 2006;13(l):12-l).

Upregulation of sCLU appears to be a general response to molecular stress. In particular, progression towards high-grade and metastatic carcinoma is correlated with a shift from nCLU to sCLU expression (Kurahashi T, Muramaki M, Yamanaka K, Hara I, Miyake H. Expression of the secreted form of clusterin protein in renal cell carcinoma as a predictor of disease extension. BJU Int 2005; 96(6): 895-899.) In addition, sCLU is associated with resistance to various anti-cancer treatments including chemotherapy {Park DC, Yeo SG, Shin EY, Mok SC, Kim DH. Clusterin confers paclitaxel resistance in cervical cancer. Gynecol Oncol 2006; 103 (3) .996- 1000), radiotherapy {Cao C, Shinohara ET, Li H, Niermann KJ, Kim KW, Sekhar KR, Gleave M, Freeman M, Lu B. Clusterin as a therapeutic target for radiation sensitization in a lung cancer model. Int J Radiat Oncol Biol Phys 2005, 63(4): 1228- 1236), hormone ablation {Miyake H, Yamanaka K, Muramaki M, Kurahashi T, Gleave M, Hara I. Enhanced expression of the secreted form of clusterin following neoadjuvant hormonal therapy as a prognostic predictor in patients undergoing radical prostatectomy for prostate cancer. Oncol Rep 2005, 14(5): 1371-1375), and specific antibodies (Biroccio A, D'Angelo C, Jansen B, Gleave ME, Zupi G. Antisense clusterin oligodeoxynucleotides increase the response ofHER-2 gene amplified breast cancer cells to Trastuzumab. JCeIl Physiol 2005;204(2):463-469).

Antagonists of sCLU have the potential to re-sensitize chemotherapy resistant malignancies.

Schmitz G. Drug evaluation: OGX-011, a clusterin-inhibiting antisense oligonucleotide. Curr Opin MoI Ther 2006; 8(6): 547-554 describe OGX-011, a clusterin-inhibiting antisense oligonucleotide (ASO) as a potential treatment for increasing the susceptibility of resistant solid tumors (breast, non-small-cell lung and prostate) to conventional cancer therapies.

There have further been preliminary results demonstrating potential use of siRNA- mediated clusterin down regulation for treatment of cancers, such as colorectal cancer {Andersen CL, et al, MoI Cell Proteomics 2007;6(6):1039-1048; Rodriguez-Pineiro AM, et al, MoI Cell Proteomics 2006,5(9): 1647-1657), melanoma (Shannon B, et al, Anticancer Res 2006;26(4A):2707-2716), renal cell cancer {Zellweger T, et al, Neoplasia 2001;3(4):360-367), bladder cancer {Chung J, et al, Cancer Lett 2004;203(2):155-161; Miyake H, et al, J Urol 2004; 171(6 Pt 1):2477-2481; Miyake H, et al, Clin Cancer Res 2001;7(12):4245-4252; Miyake H, et al, Neoplasia 2005;7(2):171-179; Yamanaka K, et al, Oncol Rep 2005; 13(5): 885-890) and pancreatic cancer (Xie MJ, et al, Pancreas 2002;25(3):234-238). Clusterin is further involved in the epithelial-to-mesenchymal transition of carcinoma cells. WO2007/030930 describes agents (such as monoclonal antibodies), having binding-activity to clusterin, which inhibit the epithelial-to-mesenchymal transition (EMT) in carcinomas.

Furthermore, the level of clusterin is increased in the hippocampus and frontal cortex of the brains of Alzheimer's Disease patients. It is currently believed that clusterin, by binding to beta-amyloid, a protein known to aggregate in the brains of these patients, acts to link the progression of this disease to the complement system (Choi-Miura and oda, Neurobiol. Aging, 1996, 17, 717722).

sCLU in fact appears to be a part of the beta-amyloid complex and other compexes related to neurodegenerative disorders, and has been correlated to age-related macular degeneration (AMD) {An E, Lu X, et al, J Proteome Res 2006;5(10):2599-2610), Alzheimer's Disease (AD) (Choi-Miura NH, et al., Neurobiol Aging 1996; 17 (5) :717- 722), and Creutzfeldt-Jakob Disease (Freixes M, et al. Acta Neuropathol 2004;108(4):295-301).

Clusterin is overexpressed in many disease states including neurodegenerative disorders, gliomas, and retinitis pigmentosa. Expression is induced in acute and chronic models of renal injury and disease, following ureter obstruction, ischemia/reperfusion, and atherosclerosis (Silkensen et al., Blochem. Cell. Biol., 1994, 72, 483-488).

Clusterin is also expressed in M cells (microfold cells) and follicular dendritic cells at inductive sites of human mucosa-associated lymphoid tissue (Waelput W et al, Histochem Cell Biol. 2007 Dec 21).

Clusterin has further been implicated in various physiological processes and physiological disturbance states including ageing, cancer progression, vascular damage, diabetes, kidney and neuron degeneration {Ioannis P. Trougakos & Efstathios S. Gonos; Free Radical Research, December 2006; 40(12): 1324-1334). Although unrelated in their etiology and clinical manifestation, these diseases represent states of increased oxidative stress, which in turn, promote amorphous aggregation of target proteins, increased genomic instability and high rates of cellular death. Among the various properties attributed to clusterin so far, those mostly investigated and invariably appreciated are its small heat shock proteins-like chaperone activity and its involvement in cell death regulation, which are both directly correlated to the main features of oxidant injury. Moreover, the presence of both a heat shock transcription factor- 1 and an activator protein- 1 element in the clusterin gene promoter indicates that the clusterin gene can be an extremely sensitive biosensor to reactive oxygen species.

To date, there are no known therapeutic agents which effectively inhibit the synthesis of clusterin. Investigative strategies aimed at modulating clusterin function have involved the use of antibodies, antisense oligonucleotides and chemical inhibitors. As in all technologies at all times, these agents can be improved upon and there remains a need for additional agents capable of effectively inhibiting clusterin.

SUMMARY OF THE INVENTION

The subject invention now provides novel peptides corresponding to segments of sCLU, homologs thereof, orthologs thereof, derivatives thereof, antibodies directed thereto, fusion proteins comprising them, all of which have a therapeutic value for a wide range of conditions, disorders and diseases.

In one aspect of this invention the conditions, disorders and diseases are conditions, disorders and diseases where induction of tumor growth arrest can be of therapeutic value.

The subject invention thus provides a peptide consisting essentially of an amino acid sequence FYFWMNGDRIDSLLENDRQQT (CGEN-CLl) [SEQ ID NO: 1] or a homolog or a derivative thereof.

The subject invention further provides a homolog of a CGEN-CLl peptide of the invention consisting essentially of an amino acid sequence LEEFLNQSSPFYFWMNGDRIDSLLENDRQQTHMLDVMQDHF [SEQ ID NO: 3]. The subject invention further provides a peptide consisting essentially of an amino acid sequence as set forth in any one of SEQ ID NOs: 6-13.

The subject invention further provides a peptide consisting essentially of an amino acid sequence corresponding to a partner helix of a peptide of the invention.

The subject invention further provides a partner helix peptide consisting essentially of an amino acid sequence RLTRKYNELLKSYQWKMLNTSS (SEQ ID NO: 5) or a homolog or a derivative thereof.

The subject invention further provides a partner helix peptide consisting essentially of an amino acid sequence

ELDESLQVAERLTRKYNELLKSYQWKMLNTSSLLEQLNEQFN (SEQ ID NO: 15) or a homolog or a derivative thereof.

The subject invention further provides a partner helix peptide consisting essentially of an amino acid sequence

NNPSQAKLRRELDESLQVAERLTRKYNELLKSYQWKMLNTSSLLEQLNEQFN WVSRLANLTQ (SEQ ID NO: 16) or a homolog or a derivative thereof.

The subject invention also provides an antibody that selectively binds to an epitope in a peptide as set forth in any one of SEQ ID NOs: 1, 3 and SEQ ID NOs: 5-13, 15 and 16.

The subject invention further provides a conjugate or fusion protein comprising a peptide of the invention as set forth in any one of SEQ ID NOs: 1, 3 and SEQ ID NOs: 5-13, 15 and 16.

The subject invention further provides a pharmaceutical composition comprising a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention or a fusion protein of the invention and a pharmaceutically acceptable carrier. The subject invention further envisages a peptide of the invention or a homolog or a derivative thereof, an antibody of the invention or a fusion protein of the invention for use in therapy and further envisages a use of the peptide of the invention or a homolog or a derivative thereof, an antibody of the invention or a fusion protein of the invention for the manufacture of a medicament.

The subject invention further provides a method of treating cancer comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention, or a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof.

The subject invention further provides a method of inhibiting epithelial-to mesenchymal transition in carcinoma cells comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention or a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof.

The subject invention further provides a method of treating a neurodegenerative disease comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention or a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof.

The subject invention further provides a method of treating a disease related to inflammation of the gastrointestinal tract comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention or a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof.

The subject invention further provides a method of treating a pathological disorder characterized by increased oxidative stress comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog thereof or a derivative thereof, an antibody of the invention or a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. - -

The subject invention also provides a nucleotide sequence encoding a peptide of the invention or a homolog thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to understand the invention and to see how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

Figure 1 demonstrates the effect of CGEN-CLl on cell growth of various cancer cell lines as revealed by MTT assay. Figure IA demonstrates absolute absorbance values (OD) of MCF-7 cells treated with various doses of CGEN-CLl. Figure IB demonstrates absolute absorbance values of PC3 cells treated with various doses of paclitaxel (taxol). Figure 1C and Figure ID respectively demonstrate the absolute absorbance values and the relative growth normalized to non-treated cells of A549 cells, treated with various concentrations of CGEN-CLl. Figure IE and Figure IF respectively demonstrate the absolute absorbance values and the relative growth normalized to non-treated cells of HT29 cells, treated with various concentrations of CGEN-CLl.

Figure IG and Figure IH respectively demonstrate the absolute absorbance values or the relative growth normalized to non-treated cells of SK-MEL cells, treated with various concentrations of CGEN-CL 1.

Figure 2 demonstrates the results of Cell Cycle Analysis as revealed by FACS analysis of Propidium Iodide (PI-A) Stained PC3 cells treated with CGEN-CLl. Figure 2A presents untreated PC3 cells; Figure 2B presents cells treated with 30OnM of CGEN-CLl [SEQ ID NO: I]; and Figure 2C presents cells treated with lμM of CGEN-CLl [SEQ ID NO: I]. Figure 2D presents graphically the percentage of cells in the different stages of cell cycle. P2, P3, P4, P5 are arbitrary symbols defining different gating areas under FACS histogram. P2 corresponds to the fraction of cells at Sub G0/G1 stage, P3 corresponds to the fraction of cells at G0/G1 stage, P3 corresponds to the fraction of cells at S stage, P4 corresponds to the fraction of cells at G2/M stage. Sub G0/G1, G0/G1, S and G2/M cell cycle stages are described for example in J. A. Smith and L. Martin, 1973, PNAS 70 (4): 1263-1267. Figure 3 demonstrates results of detection of cleaved PARP in PC3 cells treated with different doses of CGEN-CLl [SEQ ID NO:1] alone or in combination with Docetaxel (Paclitaxel). A house keeping gene Vinculin, which is not effected by the treatment, was used as a control to confirm same amount of cells loaded in each well. The amount of cleaved PARP is proportional to the amount of cells undergoing apoptosis.

Figure 4A: effect of paclitaxel (taxol) and CGEN-CLl on the growth and proliferation of lung carcinoma cell line A549. Figure 4B: effect of paclitaxel and CGEN-CLl on the growth and proliferation of prostate adenocarcinoma cell line PC3.

Figure 5: effect of CGEN-CLl on cell growth when added to the MCF-7 cell culture 24 hours after the cells were exposed to 3OnM paclitaxel and when added concomitantly with 3OnM paclitaxel to the MCF-7 breast cancer cell culture as revealed by MTT assay.

Figure 6 demonstrates the effect of CGEN-CLl on paclitaxel (taxol) sensitivity of A549 human non-small cell lung cancer cells derived from tumors in a mouse xenograft model.

Figure 7 demonstrates identification of helix-helix interactions using a unique computerized method. Figures 7A and 7B demonstrate a known example for a protein (BAG-I, Protein Data Bank ID lhxl (chain B)) that comprises two helices that interact with each other in an anti-parallel manner. Figure 7A presents the residue-residue contact map, corresponding to the two anti-parallel helices taken from BAG-I; Figure 7B demonstrates a schematic view of two helices interacting through their adjacent faces; Figure 7C demonstrates a subset of the residue-residue contact map for clusterin (residues 100-400) as predicted by SVMcon (J. Cheng, P. Baldi, BMC Bioinformatics 8, 113 (2007); Figure 7D shows a map of scores based on the Fourier transform of the correlated mutation signal of clusterin

Figure 8 presents in Silico detection of a helix-helix interaction in clusterin. Figure 8A shows a zoomed-in view of the most prominent parallel helix-helix signal of clusterin, which appears in Figure 7D. Figure 8B shows a zoomed in view of the corresponding residue-residue contact map, which appears in Figure 7C.

Figure 9 presents the results of analysis of the interaction of different concentrations (marked) of CGEN-CLl with its parent protein Clusterin.

Figure 10 presents, without being bound by theory, a potential mechanism of action of CGEN-CLl. Figure 1OA presents a schematic diagram of a conformational change in a protein, and Figure 1OB shows the blockage of the conformational change in a protein by a peptide corresponding to one of the helices. Figure 1OC demonstrates that according to this potential mechanism of action, pre-incubation of the blocking peptide CGEN-CLl (SEQ ID NO: 1) with a peptide corresponding to a partner helix (SEQ ID NO:5) abolishes the inhibitory effect of CGEN-CLl (SEQ ID NO: 1).

Figure HA demonstrates the effect of CGEN-CLl (SEQ ID NO:1) alone (left bar); counterpart helix peptide (SEQ ID NO:5) alone (right bar); and a combination of CGEN-CLl (SEQ ID NO:1) with SEQ ID NO:5 preincubated for 30 min at room temperature (central bar) on cell growth of A549 cancer cell lines as revealed by MTT assay. Figure HB demonstrates the effect of the co-incubation of CGEN-CLl (SEQ ID NO:1) with a partner helix (SEQ ID NO: 5) on CGEN-CLl binding to the parent clusterin protein.

Figure 12 shows a schematic drawing demonstrating that antibodies aimed against an epitope derived from a helix partner have the capability to block helix-helix interaction within the clusterin protein and thereby cause a biological effect resembling the biological activity achieved by CGEN-CLl.

Figure 13: shows a multiple alignment comparison of the sequence of CGEN-CLl (SEQ ID NO:1) and the orthologous sequences derived from >gi|126723644_0|[Oryctolagus cuniculus], >gi|126352584_0|[Equus caballus], >gi|47522770_0|[Sus scrofa], >gi|50979240_0|[Canis familiaris],

>gi|461756_0|[Rattus norvegicus], >gi|27806907_0|[Bos taurus],

>gi|1705937_0|[Coturnix coturnix japonica], >gi|729152_0|[Mus musculus], corresponding to SEQ ID NOs: 6-13. DETAILED DESCRIPTION OF THE INVENTION

The subject invention provides a peptide consisting essentially of an amino acid sequence FYFWMNGDRIDSLLENDRQQT (CGEN-CLl) [SEQ ID NO:1] or a homolog thereof or a derivative thereof. CGEN-CLl corresponds to amino acid residues 150-170 of the clusterin isoform 2 protein sequence (GenBank Accession number:gi|42740907).

The term "homolog" relating to a peptide of the invention as used herein should be understood to encompass a peptide which has substantially the same amino acid sequence and substantially the same biological activity as CGEN-CLl. Thus, a homolog may differ from the CGEN-CLl peptide by the addition, deletion or substitution of one or more amino acid residues, provided that the resulting peptide retains the biological activity of CGEN-CLl. Persons skilled in the art can readily determine which amino acid residues may be added, deleted or substituted (including with which amino acids such substitutions may be made) using established well known procedures. Examples of homologs of CGEN-CLl are deletion homologs containing less than all the amino acid residues of CGEN-CLl , substitution homologs wherein one or more amino acid residues specified are replaced by other amino acid residues (or by D-amino acids, or by non-natural amino acids) and addition homologs wherein one or more amino acid residues are added to a terminal or medial portion of CGEN-CLl, all of which share the biological activity of CGEN-CLl.

In one embodiment, a homolog of a peptide of the invention is LEEFLNQSSPFYFWMNGDRIDSLLENDRQQTHMLDVMQDHF [SEQ ID NO: 3] which corresponds to amino acid residues 140-180 of the clusterin isoform 2 protein sequence (GenBank Accession number: gi|42740907).

The term "homolog" relating to a peptide of the invention as used herein should also be understood to encompass an ortholog. The term "ortholog" should be understood to encompass a peptide derived from a non-human origin which has substantially the same amino acid sequence and substantially the same biological activity as CGEN- CLl.

The subject invention thus provides a peptide being an ortholog of CGEN-CLl [SEQ ID NO: 1], consisting essentially of an amino acid sequence as depicted in any one of SEQ ID NOs: 6-13, or a derivative thereof.

The term "partner helix (peptide)" as used herein should be understood to encompass a peptide corresponding to an alpha helix within the parent clusterin protein, which physically interacts with a peptide of the invention.

The subject invention thus further provides a peptide consisting essentially of an amino acid sequence corresponding to a partner helix of a peptide of the invention or a homolog or a derivative thereof.

The subject invention provides a peptide consisting essentially of an amino acid sequence corresponding to a partner helix of a peptide having an amino acid sequence as depicted in SEQ ID NO: 1.

The subject invention further provides a peptide consisting essentially of an amino acid sequence RLTRKYNELLKS YQ WKMLNTS S (SEQ ID NO:5), corresponding to a partner helix of CGEN-CLl (SEQ ID NO: 1). This peptide SEQ ID NO:5 corresponds to amino acid residues 336-357 of the clusterin protein sequence (GenBank Accession number: gi|42740907_0|[Homo sapiens] |CLUS_HUMAN , SEQ ID NO: 14).

The subject invention further provides a peptide consisting essentially of an amino acid sequence ELDESLQVAERLTRKYNELLKSYQWKMLNTSSLLEQLNEQFN (SEQ ID NO: 15), corresponding to a partner helix of CGEN-CLl (SEQ ID NO: 1). This peptide SEQ ID NO: 15 corresponds to amino acid residues 326-367 of the clusterin protein sequence (GenBank Accession number: gi|42740907_0|[Homo sapiens]|CLUS_HUMAN , SEQ ID NO: 14).

The subject invention further provides a peptide consisting essentially of an amino acid sequence - -

NNPSQAKLRRELDESLQVAERLTRKYNELLKSYQWKMLNTSSLLEQLNEQFN WVSRLANLTQ (SEQ ID NO: 16), corresponding to a partner helix of CGEN-CLl (SEQ ID NO: 1). This peptide SEQ ID NO: 16 corresponds to amino acid residues 316-377 of the clusterin protein sequence (GenBank Accession number: gi|42740907_0|[Homo sapiens] |CLUS_HUMAN , SEQ ID NO: 14).

The subject invention further provides an antibody that selectively binds to an epitope within a peptide of the invention. In one embodiment, said epitope is located in a peptide of the invention, as depicted in any one of SEQ ID NOs: 1, 3. In another embodiment, said epitope is located in a peptide of the invention, depicted in any one of SEQ ID NOs: 6-13. In yet another embodiment, said epitope is located in a peptide of the invention, depicted hi any one of SEQ ID NOs: 5, 15, 16.

The subject invention further provides an antibody that selectively binds to an epitope in a helix-helix structure derived from the interaction of a peptide of the invention with a corresponding partner helix.

The subject invention further provides a conjugate or fusion protein comprising a peptide of the invention as set forth in any one of SEQ ID NOs: 1, 3 and SEQ ID NOs: 5-13, 15 and 16.

In one aspect of the invention, a peptide of the invention induces tumor growth arrest. In another embodiment, a peptide of the invention enhances the cytostatic activity of chemotherapeutic agents such as, but not limited to paclitaxel, hence enabling treatment with reduced doses of chemotherapy. The names paclitaxel, taxol and docetaxel are used interchangeably herein.

All amino acid sequences and nucleic acid sequences shown herein as embodiments of the present invention relate to their isolated form.

Non-natural amino acids are known to those skilled hi the art of chemical synthesis and peptide chemistry. Non-limiting examples of non-natural amino acids (each one in L- or D-configuration) are azidoalanine, azidohomoalanine, 2-amino-5-hexynoic acid, norleucine, azidonorleucine , L-a-aminobutyric acid, 3-(l-naphthyl)-alanine, 3- (2-naphthyl)-alanine, p-ethynyl-phenylalanine, m-ethynyl-phenylalanine, p-ethynyl- phenylalanine, p-bromophenylalanine, p-idiophenylalanine, p-azidophenylalanine, 3- (6-chloroindolyl) alanin and those listed in Table 1 below.

Table 1

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The term "derivative" relating to a peptide of the invention should be understood to encompass a peptide which has substantially the same amino acid sequence and substantially the same biological activity as CGEN-CLl. Thus, a derivative may differ from the CGEN-CLl peptide by a modification, such as but not limited to glycosylation, amidation, acetylation, alkylation, alkenylation, alkynylation, phosphorylation, sulphorization, hydroxylation, hydrogenation, cyclization and so forth. Thus, a derivative of a peptide of the invention may differ from the CGEN-CLl peptide by a modification on one or more amino acid residues, provided that the resulting peptide retains the biological activity of CGEN-CLl. Persons skilled in the art can readily determine which amino acid residues may be modified using established well known procedures. In one embodiment, a peptide of the invention is amidated at its C-terminus and acetylated at its N-terminus.

"A peptide with substantially the same amino acid sequence as CGEN-CLl" as used herein should be understood to encompass a synthetic peptide which has at least 5, preferably at least 8 and at most 41 amino acids, which correspond to a sequential fragment of amino acids 140-180 of the clusterin isoform 2 protein sequence (GenBank Accession number: gi|42740907)[SEQ ID NO:3].

A peptide with substantially the same biological activity as CGEN-CLl as used herein should be understood to encompass a peptide which has at least 80% of the biological activity of CGEN-CLl. A peptide of the invention may be prepared synthetically (e.g. on a solid support by solid phase peptide synthesis or in solution) or by recombinant means (in bacteria, yeast, fungi, insect, vertebrate or mammalian cells) by methods well known to those skilled in the art.

In one embodiment, a peptide of the invention may be synthesized such that one or more of the bonds which link the amino acid residues of the peptide, are non-peptide bonds.

In another embodiment, a peptide of the invention may be synthesized with additional chemical groups, such that, for example, the stability, bioavailability, and/or inhibitory activity of the peptide is modified. For example, an acetyl group may be placed at the amino termini of a peptide of the invention. Additionally or alternatively, an amido group may be added to the carboxy termini of a peptide of the invention.

In yet another embodiment, a peptide of the invention may be synthesized with an altered steric configuration. For example, the D-isomer of one or more of the amino acid residues of a peptide of the invention may be used, rather than the usual L- isomer.

In yet a further embodiment, at least one of the amino acid residues of a peptide of the invention may be substituted by any one of the well known non-naturally occurring amino acid residues, selected from, but not limited to azidoalanine, azidohomoalanine, 2-amino-5-hexynoic acid, norleucine, azidonorleucine , L-a- aminobutyric acid, 3-(l-naphthyl)-alanine, 3-(2-naphthyl)-alanine, p-ethynyl- phenylalanine, m-ethynyl-phenylalanine, p-ethynyl-phenylalanine, p- bromophenylalanine, p-idiophenylalanine, p-azidophenylalanine, 3-(6-chloroindolyl) alanin and those from Table 1 herein.

In another embodiment, a peptide of the invention may have a non-peptide macromolecular carrier group covalently attached to its amino and/or carboxy terminus. Non-limiting examples of such macromolecular carrier groups are lipid- fatty acid conjugates, polyethylene glycol, and carbohydrates. The subject invention further provides a pharmaceutical composition comprising a peptide of the invention or a homolog or a derivative thereof. The subject invention also provides a pharmaceutical composition comprising an antibody of the invention. The subject invention additionally provides a pharmaceutical composition comprising a fusion protein of the invention.

Suitable routes of administration of a peptide or a pharmaceutical composition of the subject invention are oral, rectal, nasal, topical (including transdermal, buccal and sublingual), vaginal or parenteral (including subcutaneous, intramuscular, intravenous and intradermal) administration or administration via an implant. In a specific embodiment, a peptide or a pharmaceutical composition of the invention can be administered intravenously.

The exact dose and regimen of administration of a peptide or pharmaceutical composition of the invention will necessarily be dependent upon the therapeutic effect to be achieved (e.g. treatment of cancer) and may vary with the particular peptide, the route of administration, and the age and condition of the individual subject to whom the medicament is to be administered.

A dosage for humans is likely to contain 1-1000 μg per kg body weight per day. The desired dose may be presented as one dose or as multiple sub-doses administered at appropriate intervals.

The present invention thus also relates to a pharmaceutical composition comprising a peptide of the subject invention or a homolog or derivative thereof (or comprising an antibody thereto or comprising a fusion protein comprising a peptide of the invention) in admixture with pharmaceutically acceptable auxiliaries, and optionally other therapeutic agents. The auxiliaries must be "acceptable" in the sense of being compatible with the other ingredients of the composition and not deleterious to the recipients thereof.

Pharmaceutical compositions include those suitable for oral, rectal, nasal, topical (including transdermal, buccal and sublingual), vaginal or parenteral (including subcutaneous, intramuscular, intravenous and intradermal) administration or administration via an implant. The compositions may be prepared by any method well known in the art of pharmacy.

Such methods include the step of bringing in association a peptide of the invention with any auxiliary agent. The auxiliary agent(s), also named accessory ingredient(s), include those conventional in the art, such as carriers, fillers, binders, diluents, disintegrants, lubricants, colorants, flavouring agents, anti-oxidants, and wetting agents.

Pharmaceutical compositions suitable for oral administration may be presented as discrete dosage units such as pills, tablets, dragees or capsules, or as a powder or granules, or as a solution or suspension. The active ingredient may also be presented as a bolus or paste. The compositions can further be processed into a suppository or enema for rectal administration.

The invention further includes a pharmaceutical composition, as hereinbefore described, in combination with packaging material, including instructions for the use of the composition for a use as herein described.

For parenteral administration, suitable compositions include aqueous and non-aqueous sterile injection. The compositions may be presented in unit-dose or multi-dose containers, for example sealed vials and ampoules, and may be stored in a freeze- dried (lyophilised) condition requiring only the addition of sterile liquid carrier, for example water, prior to use. For transdermal administration, e.g. gels, patches or sprays can be contemplated. Compositions or formulations suitable for pulmonary administration e.g. by nasal inhalation include fine dusts or mists which may be generated by means of metered dose pressurized aerosols, nebulisers or insufflators.

The subject invention further provides a use of a peptide of the invention or a homolog or derivative thereof for the manufacture of a medicament. The subject invention also provides an antibody of the invention for the manufacture of a medicament. The subject invention additionally provides a fusion protein of the invention for the manufacture of a medicament. In one embodiment, the medicament is for the treatment of a cancer. In another embodiment, the medicament is for - -

inhibition of epithelial-to-mesenchymal transition of carcinoma cells. In another embodiment, the medicament is for treating a neurodegenerative disease. In yet another embodiment, the medicament is for the treatment of a disease related to inflammation of the gastrointestinal tract. In yet another embodiment, the medicament is for the treatment of a pathological disorder characterized by increased oxidative stress.

The term "cancer" as used herein should be understood to encompass any neoplastic disease (whether invasive or metastatic) which is characterized by abnormal and uncontrolled cell division causing malignant growth or tumor. Non-limiting examples of cancer which may be treated with a peptide of the invention are breast cancer (e.g. breast carcinoma), cervical cancer, ovary cancer (ovary carcinoma), endometrial cancer, melanoma, bladder cancer (bladder carcinoma), lung cancer (e.g. adenocarcinoma and including non-small cell lung cancer), pancreatic cancer (e.g. pancreatic carcinoma such as, for example exocrine pancreatic carcinoma), colon cancer (e.g. colorectal carcinoma, such as, for example, colon adenocarcinoma and colon adenoma), prostate cancer including the advanced disease, hematopoietic tumors of lymphoid lineage (e.g. acute lymphocytic leukemia, B-cell lymphoma, Burkitt's lymphoma), myeloid leukemia (for example, acute myelogenous leukemia (AML)), thyroid follicular cancer, myelodysplastic syndrome (MDS), tumors of mesenchymal origin (e.g. fibrosarcomas and rhabdomyosarcomas), melanoma, teratocarcinoma, neuroblastoma, glioma, glioblastoma, benign tumor of the skin (e.g. keratoacanthomas), renal cancer, anaplastic large-cell lymphoma, esophageal squamous cells carcinoma, hepatocellular carcinoma, follicular dendritic cell carcinoma, intestinal cancer, muscle-invasive cancer, seminal vesicle tumor, and epidermal carcinoma. In one embodiment, the cancer is selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer. In a specific embodiment, the cancer is breast cancer. In another specific embodiment, the cancer is lung cancer. In yet another specific embodiment, the cancer is prostate cancer. In yet another specific embodiment, the cancer is colorectal cancer. In yet another specific embodiment, the cancer is melanoma. The term "neurodegenerative disease" as used herein should be understood to encompass any neurodegenerative disease such as, but not limited to, age-related macular degeneration, Creutzfeldt-Jakob disease, Alzheimer's Disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha- synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis and transmissible spongiform encephalopathy.

The term "disease related to inflammation of the gastrointestinal tracf as used herein should be understood to encompass any inflammatory disease or condition of the gastrointestinal tract, such as, but not limited to, Crohn's disease, Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis (inflammation of the small intestine), gastritis (stomach), gastroenteritis (stomach and small intestine), colitis (large intestine), enterocolitis (large and small intestine), Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, Cirrhosis and so forth.

The term "pathological disorder characterized by increased oxidative stress " as used herein should be understood to encompass any disease, disorder or condition characterized by increased oxidative stress including, but not limited to, ageing, cardiovascular disease, chronic leg ulcers, diabetes mellitus, eye disorders, kidney degeneration, myofibrillar myopathis, pancreatic disorders, systemic lupus erythematous (SLE) and urinary tract obstruction.

The term "cardiovascular disease" as used herein should be understood to encompass any cardiovascular disease, disorder or condition including, but not limited to, atherosclerotic aorta, myocardial infraction, myocarditis and vascular injury.

The term "eye disorder" as used herein should be understood to encompass any eye disease, disorder or condition including, but not limited to, ocular surface disease, pseudoexfoliation syndrome and retinal degeneration. The term "kidney degeneration disorder" as used herein should be understood to encompass any kidney disease, disorder or condition including, but not limited to, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy and renal ischemia-reperfusion.

The term "pancreatic disorder" as used herein should be understood to encompass any pancreatic disease disorder or condition including, but not limited to, pancreatitis and pancreatic acinar cell injuries.

The subject invention thus provides a peptide of the invention or a homolog or a derivative thereof for use in therapy. The subject invention also provides an antibody of the invention for use in therapy. The subject invention additionally provides a fusion protein of the invention for use in therapy.

In one embodiment, the therapy is for the treatment of a neurodegenerative disease. In a specific embodiment, the therapy is for the treatment of a neurodegenerative disease selected from the group consisting of Alzheimer's Disease, age-related macular degeneration, Creutzfeldt- Jakob disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha-synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis and transmissible spongiform encephalopathy.

In another embodiment, the therapy is for the treatment of cancer. In a specific embodiment, the therapy is for the treatment of cancer selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer. In another specific embodiment, the cancer is breast cancer. In yet another specific embodiment, the cancer is lung cancer. In yet another specific embodiment, the cancer is prostate cancer. In yet another specific embodiment, the cancer is colorectal cancer. In yet another specific embodiment, the cancer is melanoma. In one embodiment, the cancer is invasive. In another embodiment, the cancer is metastatic. In another embodiment, the therapy is for inhibition of epithelial-to-mesenchymal transition of carcinoma cells. In yet another embodiment, the therapy is for the treatment of a disease related to inflammation of the gastrointestinal tract. In a specific embodiment, the therapy is for the treatment of a disease related to inflammation of the gastrointestinal tract selected from the group consisting of Crohn's disease, Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis, gastritis, gastroenteritis, colitis, enterocolitis, Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, and Cirrhosis.

In yet another embodiment, the therapy is for the treatment of a pathological disorder characterized by increased oxidative stress. In a specific embodiment, the therapy is for the treatment of a pathological disorder characterized by increased oxidative stress selected from the group consisting of ageing, cardiovascular disease, atherosclerotic aorta, myocardial infraction, myocarditis, vascular injury, chronic leg ulcers, diabetes mellitus, eye disorders, ocular surface disease, pseudoexfoliation syndrome, retinal degeneration, kidney degeneration, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy, renal ischemia-reperfusion, myofibrillar myopathis, pancreas disorders, pancreatitis, pancreatic acinar cell injuries, systemic lupus erythematous (SLE) and urinary tract obstruction.

The subject invention further provides a method of treating cancer comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog or a derivative thereof and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention further provides a method of treating cancer comprising administering a pharmaceutically effective amount of an antibody of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention also provides a method of treating cancer comprising administering a pharmaceutically effective amount of a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. In one embodiment, the cancer is selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer. In a specific embodiment, the cancer is breast cancer. In another specific embodiment, the cancer is lung cancer. In yet another specific embodiment, the cancer is prostate cancer. In yet another specific embodiment, the cancer is colorectal cancer. In yet another specific embodiment, the cancer is melanoma. The term "treating cancer" in the context of the present invention should be understood to encompass a decrease in tumor size; decrease in rate of tumor growth; stasis of tumor size; decrease in the number of metastasis; decrease in the number of additional metastasis; decrease in invasiveness of the cancer; decrease in the rate of progression of the tumor from one stage to the next, inhibition of tumor growth in a tissue of a mammal having a malignant cancer, control of establishment of metastases, inhibition of tumor metastases formation, regression of established tumors as well as decrease in the angiogenesis induced by the cancer. The term "treating cancer" can also refer to prophylaxis such as prevention as cancer reoccurs after previous treatment (including surgical removal) and prevention of cancer in an individual prone (genetically, due to life style, chronic inflammation and so forth) to develop cancer.

As used herein, a subject can be a male or a female subject; a subject can be a human subject or any other mammal.

The subject invention further provides a method of inhibiting the epithelial-to- mesenchymal transition of carcinoma cells comprising administering a pharmaceutically effective amount of a peptide of the invention or a homolog or a derivative thereof, and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention further provides a method of inhibiting the epithelial- to-mesenchymal transition of carcinoma cells comprising administering a pharmaceutically effective amount of an antibody of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention also provides a method of inhibiting the epithelial-to-mesenchymal transition of carcinoma cells comprising administering a pharmaceutically effective amount of a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof.

The term "inhibition of epithelial-to-mesenchymal transition of carcinoma cells" in the context of the present invention should be understood to encompass a decrease in metastatic potential and/or aggressiveness of the tumor cells. The subject invention further provides a method of treating a neurodegenerative disease comprising administering a pharmaceutically effective amount of a peptide according to the invention or a homolog or a derivative thereof and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention further provides a method of treating a neurodegenerative disease comprising administering a pharmaceutically effective amount of an antibody of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention also provides a method of treating a neurodegenerative disease comprising administering a pharmaceutically effective amount of a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. In one embodiment, the neurodegenerative disease is selected form the group consisting of Alzheimer's Disease, age-related macular degeneration, Creutzfeldt- Jakob disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha-synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis and transmissible spongiform encephalopathy.

The term "treating a neurodegenerative disease" in the context of the present invention should be understood to encompass curing of, a slowing of, or a reversal of the progress of the disease in an individual that has been diagnosed as having, or has one or more indicia of, neurodegenerative disease. Treating a neurodegenerative disease includes reducing, lessening or improving one or more of the symptoms of the disease; as well as slowing of, or stopping, the onset of the disease or of one or more of the symptoms thereof.

The subject invention further provides a method of treating a disease related to inflammation of the gastrointestinal tract comprising administering a pharmaceutically effective amount of a peptide according to the invention or a homolog or a derivative thereof, and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention further provides a method of treating a disease related to inflammation of the gastrointestinal tract comprising administering a pharmaceutically effective amount of an antibody of the invention and a - -

pharmaceutically acceptable carrier to a subject in need thereof. The subject invention also provides a method of treating a disease related to inflammation of the gastrointestinal tract comprising administering a pharmaceutically effective amount of a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. In one embodiment, the disease related to inflammation of the gastrointestinal tract is selected from the group consisting of Crohn's disease, Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis, gastritis, gastroenteritis, colitis, enterocolitis, Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, and Cirrhosis.

The term "treating a disease related to inflammation of the gastrointestinal tract" in the context of the present invention should be understood to encompass curing of, a slowing of, or a reversal of the progress of, the disease in an individual that has been diagnosed as having, or has one or more indicia of disease related to inflammation of the gastrointestinal tract. Treating a disease related to inflammation of the gastrointestinal tract includes reducing, lessening or improving one or more of the symptoms of the disease; as well as slowing of, or stopping, the onset of the disease or of one or more of the symptoms thereof.

The subject invention further provides a method of treating a pathological disorder characterized by increased oxidative stress, comprising administering a pharmaceutically effective amount of a peptide according to the invention or a homolog or a derivative thereof and a pharmaceutically acceptable carrier to a subject in need thereof.

The subject invention further provides a method of treating a pathological disorder characterized by increased oxidative stress comprising administering a pharmaceutically effective amount of an antibody of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. The subject invention also provides a method of treating a pathological disorder characterized by increased oxidative stress comprising administering a pharmaceutically effective amount of a fusion protein of the invention and a pharmaceutically acceptable carrier to a subject in need thereof. In one embodiment, the pathological disorder characterized by increased oxidative stress is selected form the group consisting of ageing, cardiovascular disease, atherosclerotic aorta, myocardial infraction, myocarditis, vascular injury, chronic leg ulcers, diabetes mellitus, eye disorders, ocular surface disease, pseudoexfoliation syndrome, retinal degeneration, kidney degeneration, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy, renal ischemia-reperfusion, myofibrillar myopathis, pancreas disorders, pancreatitis, pancreatic acinar cell injuries, systemic lupus erythematous (SLE) and urinary tract obstruction.

The term "treating a pathological disorder characterized by increased oxidative stress" in the context of the present invention should be understood to encompass curing of, a slowing of, or a reversal of the progress of the disease in an individual that has been diagnosed as having, or has one or more indicia of disease related to a pathological disorder characterized by increased oxidative stress. Treating a disease related to a pathological disorder characterized by increased oxidative stress includes reducing, lessening or improving one or more of the symptoms of the disease; as well as slowing of, or stopping, the onset of the disease or of one or more of the symptoms thereof.

A peptide, antibody, fusion protein or pharmaceutical composition of the invention may be administered in conjunction with other compounds, including, but not limited to, estrogens, androgens, progestagens, tamoxifen, antiprogestagens, chemotherapeutic agents such as cytotoxic and cytostatic agents, immunological modifiers such as interferons and interleukins, growth hormones or other cytokines, folic acid, vitamins, minerals, aromatase inhibitors, RNAi, Histone Deacetylase Inhibitors proteasome inhibitors, and/or in combination with surgery and/or radiation therapy and so forth.

Non-limiting examples of chemotherapeutic cytotoxic agents which may be administered in conjunction with CGEN-CLl (or a homolog or a derivative thereof) are alkylating agents, e.g. cyclophosphamide (CTX) (Bristol-Meyers Squibb), ifosfamide (Bristol-Meyers Squibb), chlorambucil (Glaxo Wellcome), and carmustine (Bristol-Meyers Squibb); anti-metabolites, e.g. cytarabine (Pharmacia & Upjohn), 6- - o -

mercaptopurine (Glaxo Wellcome), 6-thioguanine (Glaxo Wellcome), and methotrexate (Immunex); antibiotics, e.g. doxorubicin (Pharmacia & Upjohn), daunorubicin (NeXstar), and mitoxantrone (Immunex); agents such as vincristine (Lilly), vinblastine (Lilly), and paclitaxel (Bristol-Meyers Squibb); aromatase inhibitors such as Anastrozole (trade name: Arimidex®, AstraZeneca group); RNAi such as ISIS 3521 (ISIS Pharmaceuticals Inc); Histone Deacetylase Inhibitors such as vorinostat (trade name: ZOLINZA, Merck); and proteasome inhibitors such as bortezomib (trade name: velcade, Millennium Pharmaceuticals). In one embodiment of the present invention, the cytotoxic agent is paclitaxel.

Without being bound by theory, it is possible that a peptide of the invention interferes with internal segment-segment interactions of sCLU thereby preventing it from reaching its active state.

Without being bound by theory, the mechanism of action of a peptide of the invention may concern binding to the parent protein (Clusterin, SEQ ID NO: 14) to the segment corresponding to a partner helix of the peptide of the invention.

The subject invention further provides a (poly)nucleotide sequence encoding a peptide of the invention or a homolog thereof.

As used herein "a (polynucleotide sequence encoding a peptide of the invention or a homolog thereof should be understood to encompass any nucleotide sequence encoding a peptide of the invention or a homolog thereof. As known to a person skilled in the art, due to the known degeneracy of the genetic code (codon variability), amino acids can be coded for by more than one codon. Indeed, some amino acids have as many as six alternative codons (e.g. leucine) while some others have a single, required codon (e.g. methionine).

In one embodiment, a polynucleotide sequence of the invention is that encoding SEQ ID NO:1. In one embodiment, the nucleotide sequence is that depicted in SEQ ID NO:2. - -

In another embodiment, a polynucleotide sequence of the invention is that encoding SEQ ID NO: 3 . In one embodiment, the nucleotide sequence is that depicted in SEQ ID NO:4.

The term "antibody" as used herein should be understood to encompass a polypeptide ligand substantially encoded by an immunoglobulin gene or immunoglobulin genes, or fragments thereof, which specifically bind and recognize an epitope (e.g., an antigen).

The antibody can be provided as, e.g., an intact immunoglobulin or as a fragment, e.g., a fragment produced by digestion with various peptidases. This includes, e.g. Fab' and

F(ab)'₂ Fv fragments (defined as a genetically engineered fragment containing the variable region of the light chain and the variable region of the heavy chain expressed as two chains) and single chain antibodies ("SCAs"), genetically engineered molecules containing the variable region of the light chain and the variable region of the heavy chain, linked by a suitable polypeptide linker as a genetically fused single chain molecule.

The term "antibody " as used herein, also includes antibody fragments produced e.g. by modification of whole antibodies or synthesized de novo using recombinant DNA methodologies.

The term "antibody" includes, but is not limited to, polyclonal antibodies, monoclonal antibodies, chimeric antibodies, humanized antibodies, or single chain antibodies. In one embodiment, an antibody of the invention is a monoclonal antibody.

"Fc" portion of an antibody refers to that portion of an immunoglobulin heavy chain that comprises one or more heavy chain constant region domains, CHl, CH2 and CH3, but does not include the heavy chain variable region.

An antibody of the invention may be conjugated or coupled to e.g. a detectable label, a radioactive label, an enzyme, a fluorescent label, a luminescent label, a bioluminescent label, a therapeutic agent and so forth. Methods of producing polyclonal and monoclonal antibodies as well as fragments thereof are well known in the art (See for example, Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, New York, 1988, incorporated herein by reference).

Antibody fragments may be prepared by proteolytic hydrolysis of the antibody or by expression in e.g. E. coli or mammalian cells (e.g. Chinese hamster ovary cell culture or other protein expression systems) of DNA encoding the fragment. Antibody fragments can be obtained by pepsin or papain digestion of whole antibodies by conventional methods.

The antibody may e.g. correspond to a single complementary-determining region (CDR). CDR peptides ("minimal recognition units") can be obtained by constructing genes encoding the CDR of an antibody of interest. Such genes are prepared, for example, by using the polymerase chain reaction to synthesize the variable region from RNA of antibody-producing cells. See, for example, Larrick and Fry Methods, 2: 106-10 (1991).

Humanized forms of non-human (e.g., murine) antibodies may be chimeric molecules of immunoglobulins, or immunoglobulin chains or fragments thereof (such as Fv, Fab, Fab¹, F(ab') or other antigen-binding subsequences of antibodies) which contain a short sequence, typically of about 20-50 amino acids, derived from non-human immunoglobulin. Humanized antibodies include human immunoglobulins (recipient antibody) in which residues from a complementary determining region (CDR) of the recipient are replaced by residues from a CDR of a non-human species (donor antibody) such as mouse, rat or rabbit having the desired specificity, affinity and capacity. In some instances, Fv framework residues of the human immunoglobulin are replaced by corresponding non-human residues.

Humanized antibodies may also comprise residues which are found neither in the recipient antibody nor in the imported CDR or framework (FR) sequences. In general, the humanized antibody will comprise substantially all of at least one, and typically two, variable domains, in which all or substantially all of the CDR regions correspond to those of a non-human immunoglobulin and all or substantially all of the framework (FR) regions are those of a human immunoglobulin consensus sequence. The humanized antibody optimally will also comprise at least a portion of an immunoglobulin constant region (Fc), typically that of a human immunoglobulin [Jones et al, Nature, 321:522-525 (1986); Riechmann et al, Nature, 332:323-329 (1988); andPresta, Curr. Op. Struct. Biol, 2:593-596 (1992)].

Methods for humanizing non-human antibodies are well known in the art. Generally, a humanized antibody has one or more amino acid residues introduced into it from a source which is non-human. These non-human amino acid residues are often referred to as import residues, which are typically taken from an import variable domain. Humanization can be performed by, for example, substituting rodent CDRs or other CDR sequences for the corresponding sequences of a human antibody. Accordingly, such humanized antibodies are chimeric antibodies (see e.g. U.S. Pat. No. 4,816,567) wherein substantially less than an intact human variable domain has been substituted by the corresponding sequence from a non-human species. In practice, humanized antibodies are typically human antibodies in which some CDR residues and possibly some FR residues are substituted by residues from analogous sites in e.g. rodent antibodies.

Human antibodies can also be produced using various techniques known in the art, including phage display libraries [Hoogenboom and Winter, J. MoI. Biol, 227:381 (1991); Marks et al, J. MoI Biol, 222:581 (1991)]. The techniques of Cole et al and Boerner et al. are also available for the preparation of human monoclonal antibodies {Cole et al, Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, p. 77 (1985) and Boerner et al, J. Immunol, 147(l):86-95 (1991)]. Similarly, human antibodies can be prepared by introduction of human immunoglobulin loci into transgenic animals, e.g., mice in which the endogenous immunoglobulin genes have been partially or completely inactivated. Upon challenge, human antibody production is observed, which closely resembles that seen in humans in all respects, including gene rearrangement, assembly, and antibody repertoire. This approach is described, for example, in U.S. Pat. Nos. 5,545,807; 5,545,806; 5,569,825; 5,625,126; 5,633,425; 5,661,016, and in Marks et al, Bio/Technology 10,: 779-783 (1992); Lonberg et al, Nature 368: 856-859 (1994); Morrison, Nature 368 812-13 (1994); Fishwild et al, Nature Biotechnology 14, 845-51 (1996); Neuberger, Nature Biotechnology 14: 826 (1996); and Lonberg and Huszar, Intern. Rev. Immunol. 13, 65-93 (1995).

An antibody of the invention binds specifically (or selectively) to a peptide of the invention. The term "specifically (or selectively) binds" to a peptide or the term "specifically (or selectively) immunoreactive with," when referring to a protein or peptide, refers to a binding reaction that is determinative of the presence of the peptide in a heterogeneous population of peptide and other biologies. Thus, under designated immunoassay conditions, the specified antibodies bind to a particular peptide at least twice the background and do not substantially bind in a significant amount to other proteins or peptides present in the sample. Specific binding to an antibody under such conditions may require an antibody that is selected for its specificity to a particular peptide. A variety of immunoassay formats may be used to select antibodies specifically immunoreactive with a particular peptide. For example, solid-phase ELISA immunoassays are routinely used to select antibodies specifically immunoreactive with a protein or a peptide (see, e.g., Harlow & Lane, Antibodies, A Laboratory Manual (1988)). Typically a specific or selective reaction will be at least twice the background signal or noise and more typically more than 10 to 100 times background.

The terms "conjugate" and "fusion protein" and any lingual derivatives thereof are interchangeably used herein.

The subject invention further provides a peptide of the present invention conjugated or fused to another peptide or to a polypeptide. Such conjugates/fusion proteins may be prepared by any methodology known in the art such as, but not limited to the preparation of conjugates/fusion proteins using chemical synthesis or using recombinant technology.

Examples of peptides or polypeptides which may be conjugated/fused to a peptide of the invention are multiple antigenic peptides (MAP), Fc chains of immunoglobulins and signal sequences. In one embodiment, a peptide or a polypeptide which may be conjugated to a peptide of the invention is an immunoglobulin sequence (e.g., an IgG sequence). Non- limiting examples of immunoreactive ligands (which may e.g. serve as a targeting moiety) are an antigen-recognizing immunoglobulin (also referred to herein as "antibody") and an antigen- recognizing fragment thereof, e.g., immunoglobulins that can recognize a (tumor-associated) antigen.

As used herein, "immunoglobulin" should be understood to refer to any recognized class or subclass of immunoglobulins such as IgG, IgA, IgM, IgD, or IgE. In one embodiment, the immunoglobulin is within the IgG class of immunoglobulins. The immunoglobulin may be derived from any species, such as, but not limited to human, murine, or rabbit origin. In addition, the immunoglobulin may be polyclonal or monoclonal. In one embodiment, the immunoglobulin is monoclonal.

A conjugate/fusion protein may be prepared from a peptide according to the present invention by fusion with e.g. a portion of an immunoglobulin comprising a constant region of an immunoglobulin. In one embodiment, the portion of the immunoglobulin comprises a heavy chain constant region. In another embodiment, the heavy chain constant region comprises a human heavy chain constant region. In yet another embodiment, the heavy chain constant region is an IgG heavy chain constant region. In yet another embodiment, the heavy chain constant region is an Fc chain. In yet another embodiment, the Fc chain is an IgG Fc fragment that comprises CH2 and CH3 domains. In yet another embodiment, the IgG Fc fragment is of the IgGl subtype. The Fc chain may be a known or "wild type" Fc chain, or may be mutated. Non-limiting, illustrative, exemplary types of mutations are described in US Patent Application No. 20060034852, hereby incorporated by reference as if fully set forth herein.

The term "Fc chain" as used herein should be understood to encompass any type of Fc fragment. Several of the specific amino acid residues that are important for antibody constant region-mediated activity in the IgG subclass have been identified. Inclusion, substitution or exclusion of these specific amino acids therefore allows for inclusion or exclusion of specific immunoglobulin constant region-mediated activity. Furthermore, specific modifications may result e.g. in glycosylation and/or other desired modifications to the Fc chain. It is envisaged that modifications may be made to e.g. block a function of Fc which is considered to be undesirable, such as an undesirable immune system effect.

Thus, conjugates of the invention (which comprise a peptide of the invention) may comprise an antigen-recognizing immunoglobulin fragment and/or Fc chain. Such immunoglobulin fragments may comprise, for example, the Fab', F (ab¹) 2, Fv or Fab fragments, or other antigen-recognizing immunoglobulin fragments. Such immunoglobulin fragments can be prepared, for example, by proteolytic enzyme digestion, for example, by pepsin or papain digestion, reductive alkylation, or recombinant techniques. The materials and methods for preparing such immunoglobulin fragments are well-known to those skilled in the art. See Parham, J. Immunology, 131,2895, 1983; Lamoyi et al. , J. Immunological Methods, 56,235, 1983.

The following abbreviations should be understood as follows:

Amino Acid Abbreviation IUPAC Symbol : A = Ala = Alanine

C = Cys = Cysteine

D = Asp = Aspartic Acid

E = GIu = Glutamic Acid

F = Phe = PhenylAlanine G = GIy = Glycine

H = His = Histidine

I = He = Isoleucine

L = Lys = Lysine

M = Met = Methionine N = Asn = Asparagine

P = Pro = Proline

Q = GIn = Glutamine R = Arg = Arginine S = Ser = Serine T = Thr = Threonine

V = VaI = Valine W = Trp = Tryptophan

Y = Tyr = Tyrosine

The following abbreviations shall be employed for nucleotide bases: A for adenine; G or guanine; T for thymine; U for uracil; and C for cytosine.

The invention is further described in the following examples, which are not in any way intended to limit the scope of the inventions as claimed.

EXAMPLES

EXAMPLE 1 - Synthesis of a peptide of the invention

The peptide FYFWMNGDRIDSLLENDRQQT (CGEN-CLl) [SEQ ID NO: 1] was synthesized by solid-phase peptide synthesis using Fmoc-chemistry at Pepscan Systems (http://www.pepscan.nl). The CGEN-CLl peptide was amidated at its C- terminus, and acetylated at its N-terminus. CGEN-CLl has a molecular weight of 2690.1.

The partner helix peptide RLTRKYNELLKS YQ WKMLNTS S [SEQ ID NO: 5] was synthesized by solid-phase peptide synthesis using Fmoc-chemistry at Pepscan Systems (http://www.pepscan.nl). The partner helix peptide [SEQ ID NO: 5] was amidated at its C-terminus, and acetylated at its N-terminus, and has a molecular weight of 2760.2.

EXAMPLE 2 - Analysis of activity of CGEN-CLl peptide in various cancer cell lines.

CGEN-CLl as synthesized in Example 1 was analyzed for its ability to induce growth arrest in various cancer cell lines, such as: breast cancer cell line MCF-7 - -

(Adenocarcinoma, Breast, HTB-22, ATCC), PC3 (Adenocarcinoma, Prostate, CRL- 1435, ATCC), A549 (carcinoma, Lung, CCL-185, ATCC), HT-29 (Colorectal Adenocarcinoma, Colon, HTB-38, ATCC) and SK-mel 5 (Melanoma, Skin, HTB70, ATCC).

MCF7 cells were seeded at 10,000 cells per well in 150 μl of media (DMEM medium + 5% FBS) in a 96 well plate.

PC3 cells were seeded at 8000 cells per well in 150 μl of media (DMEM medium + 5% FBS) in a 96 well plate.

A549 cells were seeded at 6000 cells per well in 150 μl of media (DMEM medium + 5% FBS) in a 96 well plate.

HT29 cells were seeded at 10,000 cells per well in 150 μl of media (DMEM medium + 5% FBS) in a 96 well plate.

SK-MEL 5 cells were seeded at 10,000 cells per well in 150 μl of media (DMEM medium + 5% FBS) in a 96 well plate.

CGEN-CLl (lmg dissolved in 250μl of Sodium bi-carbonate to a stock concentration of 4mg/ml) was added to the wells in 50μl of medium (final volume of 200μl) as detailed in Table 2. The relative growth was normalized to controls where CGEN- CLl was not added to wells. Table 2

MTT assay:

20 μl of MTT (3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide) solution (Sigma Cat#M5655, Iot#085k5322, 1 gr was dissolved in 200 ml H2O and filtered, giving a final concentration of 5 mg/ml) was added to each well and incubated for 4 hours at 37⁰C after which the medium was vacuumed and 100 μl of DMSO was added to each well. Absorbance was measured in an ELISA reader at 492 run.

Figure IA represents the relative growth of MCF-7 cells, treated with various doses of CGEN-CLl₅ normalized to untreated control (when the CGEN-CLl concentration equals 0 the cells are untreated control).

As demonstrated in Figure IA, as little as 50 nM of CGEN-CL-I had a growth inhibiting effect when applied to MCF-7 breast cancer cells. The EC₅₀ of CGEN-CLl was 56nM.

As shown in Figure IA maximal growth inhibition of the breast cancer cells was achieved with aproximately 90OnM of CGEN-CLl.

Figure IB reveals the growth inhibition of PC3 cells, induced by various doses of CGEN-CLl. As shown in Figure IB, as little as 15nM of CGEN-CLl evoked the maximal effect of about 40% growth inhibition of PC3 cells.

Figures 1C and ID demonstrate that CGEN-CLl [SEQ ID NO:1] evoked growth inhibition of A549 human non-small cell lung cancer cells (absolute reads or normalized to non-treated respectively) as revealed by cellular viability. For this cell line the effect of CGEN-CLl was the most prominent with an EC50 of 0.95nM.

Figures IE and IF demonstrate that CGEN-CLl [SEQ ID NO:1] evoked growth inhibition of HT29 colorectal adenocarcinoma cells (absolute reads or normalized to non-treated respectively) as revealed by cellular viability.

Figures IG and IH demonstrate that CGEN-CLl [SEQ ID NO:1] evoked growth inhibition of SK-MEL melanoma cells (absolute reads or normalized to non-treated respectively) as revealed by cellular viability.

EXAMPLE 3- Effect of CGEN-CL-I on induction of Apoptosis in PC3 cells.

In order to analyze the effect of CGEN-CL-I [SEQ ID NO: 11 on induction of apoptosis in PC3 cells, PC3 cells were treated with 30OnM of CGEN-CL-I [SEQ ID NO: 1], incubated for 48 hours and treated with an additional dose of 30OnM of CGEN-CL-I [SEQ ID NO:1]. Apoptosis was analyzed either by cell cycle analysis or by PARP cleavage estimation. The amount of cleaved PARP is proportional to the amount of cells undergoing apoptosis (see for example Boulares A.H., et al, 1999, JBC 274:22932-22940).

Cell Cycle Analysis was carried out by Propidium Iodide (PI) Staining. The cells were trypsinized and suspended in DMEM medium + 10% FCS. Following centrifugation (1000 rpm, 5 min) the cell pellet was suspended in PBS (1 ml). Fixation with EtOH was performed as follows: cell suspension was transferred into 2.5 ml absolute EtOH (final concentration approx. 70%) by pipetting or by vortexing the suspension at half speed while adding the EtOH) to prevent clustering of cells during the fixation. EtOH fixated cells were incubated on ice for 15 min (or overnight at -20°C).

Propidium Iodide (PI) staining of the cells was carried out as follows: the cells were pelleted at 1500 rpm for 5 min and then suspended in 500 μl Pi-solution (in PBS: 50 μg/ml PI from 5Ox stock solution (2.5 mg/ml); 0.1 mg/ml RNase A; 0.05% Triton X- 100), following incubation for 40 min at 37°C. Then 3 ml of PBS were added, and the cells were pelleted at 1500 rpm, 5 min. The cell pellet was suspended in 500 μl PBS for flow analysis. The flow analysis was carried out using the following approximate settings (on FACSort): FLl : 570 V log; FL2: 470 V linear.

The results are shown in Figures 2 and 3. Figure 2 demonstrates that treatment of PC3 cells with CGEN-CLl-(SEQ ID NO:1) increased the percentage of apoptotic cells and increased the percentage of cells in cell cycle phases G0/G1 and G2/M . Figure 2 presents the results of Cell Cycle Analysis by Propidium Iodide (PI) Staining in CGEN-CLl -treated PC3 cells. Figure 2 A presents untreated PC3 cells; Figure 2B presents cells treated with 30OnM of CGEN-CL-I [SEQ ID NO: I]; and Figure 2C presents cells treated with 1 μM of CGEN-CL-I [SEQ ID NO: I]. Figure 2D presents graphically the percentage of cells in the different stages of cell cycle.

Figure 3 presents results of detection of cleaved PARP in PC3 cells treated with CGEN-CLl combined with or without Paclitaxel. PC3 cells were treated with CGEN-

CLl (SEQ ID NO:1), alone or in combination with Paclitaxel, for 48, 72 and 96 hours. Cleaved PARP was detected in cell Iy sates by Western blot analysis. Figure 3 demonstrates that the treatment with CGEN-CLl (SEQ ID NO:1) for 48 hours caused an enhancement in the amount of cleaved PARP and dramatically enhanced the amount of cleaved PARP in cells treated with Paclitaxel. Treatment of PC3 cells for 72 hours with CGEN-CLl [SEQ ID NO:1] alone, one administration in time zero and another after 48 hours, gave rise to a significant increase in cleaved PARP. Elevation of the amount of cleaved PARP indicates an increase in apoptotic cells.

This example thus demonstrates that treatment of PC3 prostate cancer cells with CGEN-CL 1_ gave rise to a significant increase in cells undergoing apoptosis. These observations support that CGEN-CLl functions as a specific and potent anti-cancer agent, potentially acting as an inhibitor of Clusterin, which is known to be involved in mechanisms enabling escape from apoptosis.

EXAMPLE 4 - administration of CGEN-CLl with paclitaxel on various cancer cell lines.

A549, PC3 and MCF7 cells were seeded at 6000, 8000 and 10,000 cells per well respectively in 150 μl of media (DMEM medium + 5% FBS) in 96 well plates.

Paclitaxel (Sigma T7402, Lot.036kl217, Mw 853.9, 5mg dissolved in 585μl DMSO to a stock concentration of 1OmM, stored at -20°C) and/or CGEN-CLl (lmg dissolved in 250μl of sodium bi-carbonate to a stock concentration of 4mg/ml) were added to the wells in 25μl of medium (final volume of 200μl) as detailed in Table 3. The relative growth was normalized to controls where neither paclitaxel nor CGEN- CLl was added to wells.

An MTT assay was performed as described above in Example 2.

Table 3

Table 4 demonstrates that at 30 nM Paclitaxel, the addition of as little as 7.1 nM of CGEN-CLl resulted in further inhibition of cell proliferation. Furthermore, using a sub-minimal concentration of Paclitaxel (2.25 nM) in combination with 22.3nM of CGEN-CLl resulted in a similar extent of cell proliferation inhibition as achieved by Paclitaxel alone at a concentration that results in a maximal effect. Therefore using CGEN-CLl in combination with Paclitaxel enables the use of lower concentrations of Paclitaxel, in order to achieve a similar effect, thereby enabling the reduction of side effects caused by chemotherapy.

Table 4 - effect of CGEN-CLl and paclitaxel on growth of MCF-7 breast cancer cell lines as revealed by MTT assay.

Table 4 also demonstrates that CGEN-CLl and paclitaxel have a synergistic effect on growth inhibition of the cells when given in combination. Combination indices (CI) for different drug effects were calculated to be between 0.2 and 0.6. It is noteworthy that CI lower than 1 indicates synergy between the two compounds used in combination {Zhao L, Wientjes MG, Au JL. Evaluation of combination chemotherapy: integration of nonlinear regression, curve shift, isobologram, and combination index analyses. Clin Cancer Res 2004; 10(23) J994-8004).

Figure 4 A shows that administration of CGEN-CLl [SEQ ID NO:1] in combination with Paclitaxel to A549 cells increases the sensitivity of the cells to this chemotherapeutic agent: (i) as little as InM of CGEN-CLl [SEQ ID NO:1] sensitizes A549 cells to sub-minimal concentrations of paclitaxel; (ii) maximal effect of CGEN- CLl [SEQ ID NO:1] in combination with paclitaxel (73% inhibition) is higher than the maximal effect of CGEN-CLl alone (48%) and paclitaxel alone (50%).

Thus, (1) combination of CGEN-CLl [SEQ ID NO:1] with chemotherapy resulted in similar levels of anti-cancer activity with lower doses of chemotherapy compared to higher doses of chemotherapy alone, thus reducing side effects; and (2) treatment with a combination of paclitaxel and CGEN-CLl [SEQ ID NO:1] achieved a better anticancer effect compared to monotherapy.

Figure 4B shows the synergistic effect between CGEN-CLl and paclitaxel when CGEN-CLl was added at different concentrations to PC3 cells treated with different doses of paclitaxel. As little as 7nM of CGEN-CLl sensitized PC3 cells to paclitaxel at sub-minimal doses. 6OnM of CGEN-CLl when combined with 5nM of paclitaxel achieved the same growth inhibition rates as the growth inhibition achieved by 45nM of paclitaxel alone, 6OnM of CGEN-CLl when combined with 45nM of paclitaxel achieved 1.5 fold more active growth inhibition than 45nM of paclitaxel alone.

Figure 5 shows the effect of CGEN-CLl on cell growth when added to the MCF-7 cell culture 24 hours after the cells were exposed to 30 nM paclitaxel and when added concomitantly with 3OnM paclitaxel to the MCF-7 breast cancer cell culture as revealed by MTT assay. Figure 5 demonstrates that treatment with CGEN-CLl after treatment with Paclitaxel resulted in a need for lower concentrations of CGEN-CLl to achieve the same effect as when CGEN-CL-I and paclitaxel were administered simultaneously. As it is known that treatment with Paclitaxel increases sCLU expression, without being bound by theory, these results point to a possible mechanism wherein CGEN- CLl acts by blocking sCLU activity.

EXAMPLE 5 - evaluation of the in vivo activity of CGEN-CLl.

In order to test the in- vivo activity of CGEN-CLl , Balb/c Nu/Nu female mice (10 in each group) were inoculated with 5x10⁶ A549 human non-small cell lung cancer cells. Treatment was initiated when tumors reached 400-500mm³. One group received 15mg/kg of paclitaxell (IP once every three days) and CGEN-CLl [SEQ ID NO:1] (daily injected sub-cutaneously (sc) at the surrounding of the tumor) whereas the second group received paclitaxel and saline (at the same dose and route of administration). Tumor volume was measured every three days.

As shown in Figure 6, when applied to tumor bearing BALB/c nu/nu female mice treated with paclitaxel (taxol), CGEN-CLl [SEQ ID NO:1] injected subcutaneously at the surrounding of the tumor graft resulted in a 25-30% reduction in tumor volume when compared to the control group treated with paclitaxel and vehicle.

EXAMPLE 6 - design of conformational change blockers of Clusterin.

Conformational changes in proteins play a major role in activity regulation. Natural and synthetic molecules that modulate such changes are of considerable biological importance. Such molecules include allosteric effectors that alter the rapidity of enzyme-catalyzed reactions (J Monod, et al, J MoI Biol 12, 88 (1965)), molecules that shift the oligomerization equilibrium of proteins (Z. Hayouka et al, Proc Natl Acad Sci USA 104, 8316 (2007)), and molecules that interfere with trans-membrane helix-helix associations (H. Yin et al., Science 315, 1817 (2007)). Conformational change modulators of clusterin were designed. The designed peptides were identified using a unique computerized method to interfere with conformational changes involving helix-helix interactions.

The computational approach for sequence-based identification of intra-molecular helix-helix interactions is able to detect interactions that are ordinarily difficult to observe experimentally. The computational approach was based on the analysis of correlated mutations in the sequences of a target protein and its homologs (Figure 7 and Figure 8). Such analysis aims at identifying intra-molecular interactions between pairs of amino acid residues (S. S. Choi, et al, Nat Genet 37, 1367 (2005)); G B. Gloor, et al, Biochemistry 44, 7156 (2005); U. Gobel, et al, Proteins 18, 309 (1994); S. W. Lockless, et al, Science 286, 295 (1999); L. C. Martin, M. Wahl, Bioinformatics 21, 4116 (2005); F. Pazos, et al, Comput Appl Biosci 13, 319 (1997)) (J Cheng, P. et al, BMC Bioinformatics 8, 113 (2007); S. D. Dunn, L. et al, Bioinformatics 24, 333 (2008); G. Shackelford, K. et al, Karplus, Proteins 69 Suppl 8, 159 (2007)) facilitated by the introduction of a new category of residue-residue contact prediction into the Critical Assessment of techniques for protein Structure Prediction (CASP) competition (J M. Izarzugaza, et al, Proteins 69 Suppl 8, 152 (2007). Nevertheless, despite these algorithmic advances and the growing availability of sequence data, the signal to noise ratio of correlated mutation analysis remains relatively low, and does not currently allow ab initio structure prediction.

The detection of interacting segments through correlated mutation analysis is thus hindered by the low signal to noise ratio, when applied naively, e.g., averaging over a sliding window approach. The main conceptual new ingredient of the unique in silico approach used herein for identification of peptides capable of acting as conformational change blockers of Clusterin, is the exploitation of the periodic nature of the correlated mutation data for helix-helix interactions, for which the corresponding periodicity should be around 3.6 amino acids (Figures 7 A-B). Technically, this was achieved using an appropriate application of the Fourier transform. An interaction was detected by a peak in the absolute value of the Fourier transform of the correlated mutations signal around the typical periodicity. Although the transform is one dimensional, it analyses the two dimensional matrix of correlated mutation scores, detecting the periodicity manifested in both interacting segments (Figures 7C-D). hi this unique technology, used for computerized detection of peptides capable of acting as conformational change blockers of Clusterin, Fourier transform was introduced to correlated mutations analysis, substantially improving the signal to noise ratio (Figure 7C vs. Figure 7D), as well as a "two dimensional" Fourier analysis was employed in protein structure determination. This newly-developed tool was applied to clusterin, resulting in detection of remarkable peak of the absolute values of the Fourier transform around the expected periodicity.

Using this approach, an interaction between CGEN-CLl (SEQ ID NO:1) and a helix peptide corresponding to residues 336-357 in clusterin (partner helix) [SEQ ID NO: 5] was computationally identified.

Figure 7 shows the identification using the unique computerized method for prediction of helix-helix interactions. Figure 7A demonstrates residue-residue contact map of two anti-parallel helices taken from the solved structure of BAG-I (PDB id: IHXl Chain B) calculated using CSU (V. Sobolev, et al, Bioinformatics 15, 327 (1999)). Figure 7B demonstrates a schematic view of two helices interacting through their adjacent faces. This interaction gives rise to the 3.6-residue periodicity that is the basis of the subject new Fourier transform-based approach. Each residue on one helix may interact with 3-4 residues on the other helix spanning a region of 8-9 residues (see red rectangle in Figure 7A). Figure 7C demonstrates the residue-residue contact map for clusterin as predicted by SVMcon (J. Cheng, P. et al, BMC Bioinformatics 8, 113 (2007)). . Typically, in these methods (S. S. Choi, Nat Genet 37, 1367 (2005); G.

B. Gloor, Biochemistry 44, 7156 (2005); U. Gobel, et al., Proteins 18, 309 (1994); L

C. Martin, et al, Bioinformatics 21, 4116 (2005); F. Pazos, et al, Comput Appl Biosci 13, 319 (1997); J. Cheng, et al, BMC Bioinformatics 8, 113 (2007); S. D.

Dunn, et al, Bioinformatics 24, 333 (2008); G. Shackelford, et al, Proteins 69 Suppl 8, 159 (2007)). the sequences of the protein of interest and its homologs are used for constructing a multiple sequence alignment (MSA). Correlations between columns in the MSA (correlated mutations) point to predicted residue-residue interactions. Until today however, known contact map prediction technologies suffered from low recall and low precision. These drawbacks in helix-helix interactions identification have now been solved by the unique in silico approach used herein for identification of peptides capable of acting as conformational change blockers of Clusterin. Figure 7D shows a map of scores based on the Fourier transform of the correlated mutation signal of clusterin. In order to detect helix-helix interactions, for each pair of 21- residue long segments two vectors of sums of the predicted residue-residue scores are calculated: one for the rows and one for the columns of the corresponding 21 by 21 matrix. For the detection of parallel helix-helix interactions only the principal (i.e. major) diagonal and its 4 neighboring diagonals from each side are summed. For anti- parallel interactions, the minor diagonal is similarly utilized. The two vectors are then Fourier transformed. A joint score is calculated that is non-zero only if a significant peak representing a periodicity of about 3.6 residues exists in the Fourier Transform of both the 'rows' and the 'column' vectors. Figures 7C and 7D demonstrate how the Fourier Transform enhances the signal to noise ratio and enables reliable predictions of parallel helix-helix interaction in clusterin.

Figure 8 presents In Silico detection of a helix-helix interaction in clusterin. Figure 8A shows a zoomed in view of the most prominent parallel helix-helix signal of clusterin, which appeared in Figure 7D. Figure 8B shows a zoomed in view of the corresponding residue-residue contact map, which appeared in Figure 7C.

EXAMPLE 7 - Analysis of CGEN-CLl binding to recombinant Clusterin.

The capability of CGEN-CLl to specifically bind to recombinant Clusterin protein was investigated using the BIACORE technology, measuring protein-protein interaction and binding affinity. The technology is based on surface plasmon resonance (SPR), an optical phenomenon that enables detection of unlabeled interactants in real time. The SPR-based biosensors can be used in determination of active concentration, screening and characterization in terms of both affinity and kinetics.

Peptide-protein interaction was analyzed using surface plasmon resonance. Analysis of the interaction between CGEN-CLl [SEQ ID NO:1] and recombinant human clusterin (Biovendor, Modrice, Czech republic cat no: RD 172034100) was conducted using the BIAcore biosensor (Pharmacia Biosensor, Uppsala, Sweden). Clusterin was immobilized directly to a CM5 sensor chip (2000 resonance units (RU)). Solution containing five different concentrations of CGEN-CLl [SEQ ID NO:1] (312, 625, 1250, 2500 and 500OnM) was injected into the sample chamber of the BIACORE device and the interaction was monitored for 5 minutes using surface plasmon resonance. As a background, the solutions were also injected onto an empty flow cell with no immobilized ligand and the binding levels achieved were subtracted. Data were analyzed using BIAevaluation software.

Figure 9 presents the results of the analysis of the interaction of CGEN-CLl with its parent protein clusterin and shows that CGEN-CLl binds to its parent protein clusterin in a dose dependent manner. Significant binding is detected from 0.5 to 5 μM.

EXAMPLE 8 - Biological confirmation for the computationally identified interaction between CGEN-CLl (SEO ID NO: 1) and its helix partner (SEO ID NO: 5).

In order to evaluate whether the two computationally identified α-helices (CGEN- CLl (SEQ ID NO: 1) and its helix partner (SEQ ID NO: 5)) bind to each other in the Clusterin protein, a co-incubation of the two peptides was analyzed for its ability to eliminate the biological activity of CGEN-CL 1.

Pre-incubation for 30 minutes of 15OnM CGEN-CLl peptide (SEQ ID NO:1) with an equimolar concentration of the helix partner (SEQ ID NO: 5) was carried out at room temperature. CGEN-CLl peptide (SEQ ID NO:1) alone, or the helix partner (SEQ ID NO:5) alone or the pre-incubated CGEN-CLl peptide (SEQ ID NO:1) with helix partner (SEQ ID NO: 5) were used for viability assay of A549 cells, using MTT assay as described in Example 2 herein.

Figure 10 presents a potential mechanism of action of CGEN-CLl. Figure 1OA presents a schematic diagram of a conformational change in a protein, and Figure 1OB shows the blockage of the conformational change in a protein by a peptide corresponding to one of the helices. Figure 1OC demonstrates that according to this potential mechanism of action, pre-incubation of the blocking peptide CGEN-CLl (SEQ ID NO: 1) with a peptide corresponding to a partner helix (SEQ ID NO:5) abolishes the inhibitory effect of CGEN-CLl (SEQ ID NO: 1).

The experimental data were consistent with the computationally predicted mode of action, in which the biological inhibitory activity of the peptides takes place upon their binding to the segment corresponding to the counterpart helix within the parent protein (Figure 1 IA). Indeed, these results support the existence of both an active ("close") conformation, in which the two segments interact with each other, and an inactive ("open") conformation, in which the two segments do not interact (Figure HA).

Figure 1 IA presents the results of pre-incubation of 15OnM CGEN-CLl peptide (SEQ ID NO:1) with an equimolar concentration of a peptide corresponding to its counterpart helix (SEQ ID NO:5), leading to attenuated the activity of CGEN-CLl.

As shown in Figure HA, the biological effect of CGEN-CLl (SEQ ID NO:1), that was demonstrated herein in Figures 1C and ID, was abolished in the presence of partner helix peptide (SEQ ID NO:5).

EXAMPLE 9 - Co-incubation of CGEN-CLl with a partner helix blocks its binding to parent protein Clusterin.

Peptide-protein interaction was analyzed using surface plasmon resonance. Analysis of the interaction between CGEN-CLl [SEQ ID NO:1] and recombinant human clusterin (Biovendor, Modrice, Czech republic cat no: RD172034100) was conducted using the BIAcore biosensor (Pharmacia Biosensor, Uppsala, Sweden). Clusterin was immobilized directly to a CM5 sensor chip (2000 resonance units (RU)). Solution containing either lOμM of CGEN-CLl [SEQ ID NO:1] peptide or a mixture of CGEN-CLl and its partner helix (SEQ ID NO:5), lOμM each, preincubated for 30 minutes at room temperature, was injected to the BIAcore. As a background, the solutions were also injected onto an empty flow cell with no immobilized ligand and the binding levels achieved were subtracted. Data was analyzed using BIAevaluation software.

As demonstrated in Figure HB, the co-incubation of CGEN-CLl (SEQ ID NO:1) with its partner helix (SEQ ID NO: 5) completely abolished the binding of CGEN- CLl to recombinant Clusterin. EXAMPLE 10 - Antibodies

Reagents other than peptides are also used to inhibit the formation of the helix-helix interactions between the segment corresponding to residues 150-170 and the segment corresponding to residues 336-357. Antibodies that specifically bind to an epitope in a helix partner peptide of CGEN-CLl or an epitope in the segment corresponding to CGEN-CLl itself are highly effective to inhibit the formation of the helix-helix interactions between the segment corresponding to residues 150-170 and the segment corresponding to residues 336-357, and thereby to act as antagonists of clusterin.

Figure 12 shows a schematic drawing demonstrating that antibodies aimed against an epitope derived from a helix partner have the capability to block the helix-helix interaction within the clusterin protein and thereby cause a biological effect resembling the biological activity achieved by CGEN-CLl.

Thus, antibodies that specifically bind to an epitope in a helix partner peptide of CGEN-CLl or an epitope in the segment corresponding to CGEN-CLl or homologs or fragments thereof are used for treating wide range of conditions, disorders and diseases, selected from but not limited to cancer, neurodegenerative disease, disease related to inflammation of the gastrointestinal tract, pathological disorder characterized by increased oxidative stress, cardiovascular disease, eye disorder, kidney degeneration disorder, and pancreatic disorder.

EXAMPLE 11 - Orthologs

The sequence of the CGEN-CLl (SEQ ID NO: 1), corresponding to amino acid residues 150-170, in the human gi|42740907 protein (SEQ ID NO: 14) is highly conserved throughout other species and orthologs, as can be seen from Figure 13.

Figure 13 shows a multiple alignment comparison of the sequence of CGEN-CLl

(SEQ ID NO:1) and the homologous sequences derived from

>gi|126723644_0|[Oryctolagus cuniculus], >gi|126352584_0|[Equus caballus], >gi|47522770_0|[Sus scrofa], >gi|50979240_0|[Canis familiaris], >gi|461756_0|[Rattus norvegicus], >gi|27806907_0|[Bos taurus],

>gi|1705937_0|[Coturnix coturnix japonica], >gi|729152_0|[Mus musculus], corresponding to SEQ ID NOs: 6-13.

Claims

CLAIMS:

1. An isolated peptide consisting essentially of an amino acid sequence as set forth in SEQ ID NO: 1 or a homolog thereof or a derivative thereof.

2. An isolated peptide consisting essentially of an amino acid sequence as set forth in SEQ ID NO: 3 or a derivative thereof.

3. An isolated peptide consisting essentially of an amino acid sequence as set forth in any one of SEQ ID NOs: 6-13.

4. An isolated peptide consisting essentially of an amino acid sequence as set forth in any one of SEQ ID NOs: 5, 15, 16.

5. An antibody that selectively binds to an epitope in a peptide of any one of claims 1-4.

6. A fusion protein comprising a peptide of any one of claims 1 -4.

7. A pharmaceutical composition comprising a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier.

8. A use of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 for the manufacture of a medicament.

9. A use according to claim 8 wherein the medicament is for the treatment of cancer.

10. A use according to claim 8 wherein the medicament is for inhibition of epithelial-to- mesenchymal transition in carcinoma cells.

11. A use according to claim 9 wherein the cancer is selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer.

12. A use according to claim 11 wherein the cancer is breast cancer.

13. A use according to claim 11 wherein the cancer is lung cancer.

14. A use according to claim 11 wherein the cancer is prostate cancer.

15. A use according to claim 11 wherein the cancer is colorectal cancer.

16. A use according to claim 11 wherein the cancer is melanoma.

17. A use according to claim 11 wherein the medicament is for the treatment of a neurodegenerative disease.

18. A use according to claim 17 wherein the neurodegenerative disease is selected from the group consisting of Alzheimer's Disease, age-related macular degeneration, Creutzfeldt- Jakob disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha-synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis and transmissible spongiform encephalopathy.

19. A use according to claim 8 wherein the medicament is for the treatment of a disease related to inflammation of the gastrointestinal tract.

20. A use according to claim 19, wherein the disease related to inflammation of the gastrointestinal tract is selected from the group consisting of Crohn's disease,

Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis, gastritis, gastroenteritis, colitis, enterocolitis, Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, and Cirrhosis.

21. A use according to claim 8 wherein the medicament is for the treatment of a pathological disorder characterized by increased oxidative stress.

22. A use according to claim 21 wherein the pathological disorder characterized by increased oxidative stress is selected from the group consisting of ageing, cardiovascular disease, atherosclerotic aorta, myocardial infraction, myocarditis, vascular injury, chronic leg ulcers, diabetes mellitus, eye disorders, ocular surface disease, pseudoexfoliation syndrome, retinal degeneration, kidney degeneration, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy, renal ischemia-reperfusion, myofibrillar myopathis, pancreas disorders, pancreatitis, pancreatic acinar cell injuries, systemic lupus erythematous (SLE) and urinary track obstruction.

23. A peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 for use in therapy.

24. A peptide, antibody or fusion protein according to claim 23 wherein the therapy is cancer therapy.

25. A peptide, antibody or fusion protein according to claim 23 wherein the therapy is therapy to inhibit the epithelial-to- mesenchymal transition of carcinoma cells.

26. A peptide, antibody or fusion protein according to claim 24 wherein the cancer therapy is selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer therapy.

27. A peptide, antibody or fusion protein according to claim 26 wherein the cancer therapy is breast cancer therapy.

28. A peptide, antibody or fusion protein according to claim 26 wherein the cancer therapy is lung cancer therapy.

29. A peptide, antibody or fusion protein according to claim 26 wherein the cancer therapy is prostate cancer therapy.

30. A peptide, antibody or fusion protein according to claim 26 wherein the cancer therapy is colorectal cancer therapy.

31. A peptide, antibody or fusion protein according to claim 26 wherein the cancer therapy is melanoma cancer therapy.

32. A peptide, antibody or fusion protein according to claim 23 wherein the therapy is therapy for a neurodegenerative disease.

33. A peptide, antibody or fusion protein according to claim 32 wherein the therapy is selected from the group consisting of therapy for Alzheimer's disease, age- related macular degeneration (AMD), Creutzfeldt- Jakob disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha-synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis and transmissible spongiform encephalopathy.

34. A peptide, antibody or fusion protein according to claim 23 wherein the therapy is therapy for a disease related to inflammation of the gastrointestinal tract.

35. A peptide, antibody or fusion protein according to claim 34, wherein the disease related to inflammation of the gastrointestinal tract therapy is selected from the group consisting of therapy for Crohn's disease, Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis, gastritis, gastroenteritis, colitis, enterocolitis, Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, and Cirrhosis therapy.

36. A peptide, antibody or fusion protein according to claim 23 wherein the therapy is therapy for a pathological disorder characterized by increased oxidative stress.

37. A peptide, antibody or fusion protein according to claim 36, wherein the pathological disorder characterized by increased oxidative stress is selected from the group consisting of ageing, cardiovascular disease, atherosclerotic aorta, myocardial infraction, myocarditis, vascular injury, chronic leg ulcers, diabetes mellitus, eye disorders, ocular surface disease, pseudoexfoliation syndrome, retinal degeneration, kidney degeneration, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy, renal ischemia-reperfusion, myofibrillar myopathis, pancreas disorders, pancreatitis, pancreatic acinar cell injuries, systemic lupus erythematous (SLE) and urinary track obstruction.

38. A method of treating cancer comprising administering a pharmaceutically effective amount of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier to a subject in need thereof.

39. A method according to claim 38 wherein the cancer is selected from the group consisting of breast cancer, prostate cancer, lung cancer, colorectal cancer, melanoma, renal cancer, bladder cancer and pancreatic cancer .

40. A method according to 39 wherein the cancer is breast cancer.

41. A method according to 39 wherein the cancer is lung cancer.

42. A method according to 39 wherein the cancer is prostate cancer.

43. A method according to 39 wherein the cancer is colorectal cancer.

44. A method according to 39 wherein the cancer is melanoma.

45. A method of inhibiting the epithelial-to-mesenchymal transition in carcinoma cells comprising administering a pharmaceutically effective amount of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier to a subject in need thereof. - -

46. A method of treating a neurodegenerative disease comprising administering a pharmaceutically effective amount of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier to a subject in need thereof.

47. A method according to claim 46, wherein the neurodegenerative disease is selected from the group consisting of Alzheimer's disease, age-related macular degeneration, Creutzfeldt- Jakob disease, radiotherapy induced dementia, axon injury, acute cortical spreading depression, alpha-synucleinopathies, brain ischemia, Huntington's disease, permanent focal cerebral ischemia, peripheral nerve regeneration, post-status epilepticus model, spinal cord injury, sporadic amyotrophic lateralsclerosis or transmissible spongiform encephalopathy .

48. A method of treating a disease related to inflammation of the gastrointestinal tract comprising administering a pharmaceutically effective amount of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier to a subject in need thereof.

49. A method according to claim 48, wherein the disease related to inflammation of the gastrointestinal tract is selected from the group consisting of Crohn's disease, Ulcerative colitis, Celiac disease, inflammatory bowel disease, enteritis, gastritis, gastroenteritis, colitis, enterocolitis, Cholecystitis, Pancreatitis, Irritable bowel syndrome, Caecitis, and Cirrhosis.

50. A method of treating a disease pathological disorder characterized by increased oxidative stress comprising administering a pharmaceutically effective amount of a peptide according to claim 1 or 2 or an antibody according to claim 5 or a fusion protein according to claim 6 and a pharmaceutically acceptable carrier to a subject in need thereof.

51. A method according to claim 50, wherein the pathological disorder characterized by increased oxidative stress is selected from the group consisting of ageing, cardiovascular disease, atherosclerotic aorta, myocardial infraction, myocarditis, vascular injury, chronic leg ulcers, diabetes mellitus, eye disorders, ocular surface disease, pseudoexfoliation syndrome, retinal degeneration, kidney degeneration, cystic kidney disease, hydronephrotic neonatal kidney, obstructive nephropathy, renal ischemia-reperfusion, myofibrillar myopathis, pancreas disorders, pancreatitis, pancreatic acinar cell injuries, systemic lupus erythematous (SLE) and urinary track obstruction.

52. A nucleotide sequence encoding a peptide according to claim 1.

53. A nucleotide sequence encoding a peptide according to claim 2.

54. A nucleotide sequence according to claim 52 wherein the sequence is SEQ ID NO.2.

55. A nucleotide sequence according to claim 53 wherein the sequence is SEQ ID NO.4.