WO2006015385A2 - Anti-angiogenic peptides and methods of use thereof - Google Patents
Anti-angiogenic peptides and methods of use thereof Download PDFInfo
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- WO2006015385A2 WO2006015385A2 PCT/US2005/027883 US2005027883W WO2006015385A2 WO 2006015385 A2 WO2006015385 A2 WO 2006015385A2 US 2005027883 W US2005027883 W US 2005027883W WO 2006015385 A2 WO2006015385 A2 WO 2006015385A2
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Definitions
- ANTI-ANGIOGENIC PEPTIDES AND METHODS OF USE THEREOF Field of Invention This application relates to the identification and design of therapeutic peptides for treatment and characterization of angiogenesis-related diseases, particularly anti- angiogenic peptides that block binding of vascular endothelial growth factor (VEGF) to its receptor, VEGFR2, also known as the kinase domain receptor or kinase insert domain- containing receptor (KDR).
- VEGF vascular endothelial growth factor
- VEGFR2 also known as the kinase domain receptor or kinase insert domain- containing receptor (KDR).
- Angiogenesis is the process by which new blood vessels form by developing from pre-existing vessels. This multi-step process involves signaling to endothelial cells, which results in (1) dissolution of the membrane of the originating vessel, (2) migration and proliferation of the endothelial cells, and (3) formation of a new vascular tube by the migrating cells (Alberts et ah, 1994, Molecular Biology of the Cell. Garland Publishing, Inc., New York, N. Y. 1294 pp.).
- Angiogenesis is required for the growth and metastasis of solid tumors. Studies have confirmed that in the absence of angiogenesis, tumors rarely have the ability to develop beyond a few millimeters in diameter (Isayeva et ah, 2004, Int. J. Oncol. 25(2):335-43). Angiogenesis is also necessary for metastasis formation by facilitating the entry of tumor cells into the blood circulation and providing new blood vessels that supply nutrients and oxygen for tumor growth at the metastatic site (Takeda et ah, 2002, Ann Surg. Oncol. 9(7):610-16).
- Endothelial cells are also active participants in chronic inflammatory diseases, in which they express various cytokines, cytokine receptors and proteases that are involved in angiogenesis, proliferation and tissue degradation. For example, during rheumatoid arthritis, endothelial cells become activated and express adhesion molecules and chemokines, leading to leukocyte migration from the blood into the tissue. Endothelial cell permeability increases, leading to edema- formation and swelling of the joints — - (Middleton et ah, 2004, Arthritis Res. Ther. 6(2):60-72).
- Abnormal neovascularization is also seen in various eye diseases, where it results in hemorrhage and functional disorder of the eye, contributing to the loss of vision associated with such diseases as retinopathy of prematurity, diabetic retinopathy, retinal vein occlusion, and age-related macular degeneration (Yoshida et ah, 1999, Histol
- angiogenesis is also of crucial importance for the treatment of skin diseases, as it is a key contributor to pathologic dermatological processes such as psoriasis, warts, cutaneous malignancy, decubitus ulcers, stasis ulcers, pyogenic granulomas, hemangiomas, Kaposi's sarcoma, and possibly Spitz nevus, hypertrophic scars, and keloids (Arbiser, 1996, J. Am. Acad. Dermatol. 34(3):486-97).
- pathologic dermatological processes such as psoriasis, warts, cutaneous malignancy, decubitus ulcers, stasis ulcers, pyogenic granulomas, hemangiomas, Kaposi's sarcoma, and possibly Spitz nevus, hypertrophic scars, and keloids (Arbiser, 1996, J. Am. Acad. Dermatol. 34(3):486-97).
- VEGF Vascular endothelial growth factor
- RA rheumatoid arthritis
- VEGF has also been implicated as a major mediator of intraocular neovascularization and permeability.
- Transgenic mice overexpressing VEGF demonstrate clinical intraretinal and subretinal neovascularization, and form leaky intraocular blood vessels detectable by angiography, demonstrating their similarity to human disease (Miller, 1997, Am. J. Pathol. 151(1): 13-23).
- VEGF acts through two high affinity tyrosine kinase receptors, VEGFRl (or fins-like tyrosine kinase, FIt-I), and VEGFR2 (also known as kinase domain receptor or kinase insert domain-containing receptor, KDR).
- VEGFRl or fins-like tyrosine kinase, FIt-I
- VEGFR2 also known as kinase domain receptor or kinase insert domain-containing receptor, KDR.
- KDR appears to be the major transducer of VEGF angiogenic effects, i.e., mitogenicity, chemotaxis and induction of tube formation (Binetruy-Tourniere et al, supra). Inhibition of KDR- mediated signal transduction by VEGF, therefore, represents an excellent approach for anti-angiogenic intervention.
- inhibition of angiogenesis and tumor inhibition has been achieved by using agents that either interrupt VEGF/KDR interaction and/or block the KDR signal transduction pathway including: antibodies to VEGF (Kim et al, 1993, Nature 362, 841— 844; Kanai et al, 1998, J. Cancer 77, 933-936; Margolin et al, 2001, J. Clin. Oncol. 19, 851-856); antibodies to KDR (Lu et al, 2003, supra; Zhu et al, 1998, Cancer Res. 58, 3209-3214; Zhu et al 2003, Leukemia 17, 604-611; Prewett et al, 1999, Cancer Res.
- agents that either interrupt VEGF/KDR interaction and/or block the KDR signal transduction pathway including: antibodies to VEGF (Kim et al, 1993, Nature 362, 841— 844; Kanai et al, 1998, J. Cancer 77, 933-936; Margolin et al, 2001, J. Clin.
- Avastin humanized anti- VEGF monoclonal antibody
- This antibody has shown efficacy in the treatment of colon cancer, and is being tested on other tumor cell types. Cost analysis suggests that treatment with this antibody could add from $42,800 to $55,000 per patient to the cost of care for advanced colorectal cancer, or more than $1.5 billion annually in the United States.
- drugs such as small peptides that are less expensive to manufacture and may be used therapeutically at a much lower cost.
- the present inventors have identified using mini peptide display technology novel - - anti-angiogenic peptides that -block or reduce VEGF-induced stimulation of-endothelial cell activation or proliferation.
- the peptides of the invention provide an improvement over the prior art, in that at least some of the inventive peptides demonstrate a significantly lower IC 50 when compared to previously known peptides.
- the peptides of the invention are useful for the treatment of angiogenesis-related diseases, including the treatment of tumors and neoplasias, inflammatory diseases such as rheumatoid arthritis and psoriasis, vascular disorders including atherosclerosis, vascular restenosis, arteriovenous malformations and vascular adhesion pathologies, and eye diseases including diabetic retinopathy and macular degeneration.
- angiogenesis-related diseases including the treatment of tumors and neoplasias, inflammatory diseases such as rheumatoid arthritis and psoriasis, vascular disorders including atherosclerosis, vascular restenosis, arteriovenous malformations and vascular adhesion pathologies, and eye diseases including diabetic retinopathy and macular degeneration.
- Figure 1 shows a phylogenetic tree generated by custalW multiple sequence alignment algorithm using Vector NTI, which compares the relationship between the peptides identified using mini peptide display technology and the peptides disclosed in Binetruy-Tournaire R, Delow C, Malavaud B, Vassy R, Rouyre S, Kraemer M, Plouet J, Derbin C, Perret G, Mazie JC. EMBO J. 2000 Apr 3;19(7): 1525-33, and Lu D, Shen J, ViI MD, Zhang H, Jimenez X, Bohlen P, Witte L, Zhu Z. J Biol Chem. 2003 Oct 31;278(44):43496-507.
- Figure 2 shows a homology alignment between the following peptides: EmboK4
- Figure 4 is a graph showing VEGF-mediated survival/proliferation of bovine retinal endothelial cells (BRE cells) in the presence of various peptides.
- Figure 5 shows micrographs of the number and morphology BRE cells exposed to various treatments, including (A) no VEGF, (B) VEGF, (C) VEGF plus 100 microgram/ml of ST100,038, (D) VEGF plus 50 microgram/ml of ST100,038, and (E) VEGF plus 100 microgram/ml of ST100,039.
- Figure 6 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of various peptides, where the maximum concentration of peptide was increased to 200 microgram/ml.
- Figure 7 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of ST 100,038 peptide containing L amino acids versus the same sequence containing D -amino acids (peptide ST100,045).
- Figure 8 shows micrographs of the number and morphology of BRE cells exposed to various treatments, including (A) no VEGF, (B) VEGF, (C) VEGF plus 50 microgram/ml of ST100,038, (D) VEGF plus 50 microgram/ml of ST100,045.
- Figure 9 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of peptides ST 100,038 and ST 100,045 after the cells had adhered.
- Figure 10 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of peptides STl 00,038 and ST 100,045 before the cells had adhered.
- Figure 11 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of peptide ST100,038 and 10% fetal bovine serum.
- Figure 12 is a graph showing VEGF-mediated survival/proliferation of BRE cells in the presence of peptides ST 100,038 and ST 100,045 after the cells had adhered.
- Figure 13 is a graph showing the effects of the peptide ST 100,038 and the retro inverso peptide ST 100,059 on VEGF-mediated HUVEC survival.
- Figure 14 shows photographs of angioreactors after removal from mice treated with various peptides and represent a qualitative appreciation of the level of angiogenesis.
- Photograph (A) shows the angioreactors from mice treated with VEGF plus 160 ⁇ M peptide ST 100,038.
- Photograph (B) shows the angioreactors from mice treated with VEGF plus 40 ⁇ M peptide ST 100,038.
- Photograph (C) shows the angioreactors from mice treated with VEGF plus 160 ⁇ M peptide ST100,045.
- Photograph (D) shows the angioreactors from mice treated with VEGF plus 40 ⁇ M peptide ST 100,045.
- Photograph (E) shows the angioreactors from mice treated with PBS alone.
- Photograph (F) shows the angioreactors from mice treated with VEGF alone.
- Photograph (G) shows the angioreactors from mice treated with VEGF plus peptide TSP616.
- Figure 15 is a bar graph comparing inhibition of VEGF-mediated angiogenesis in vivo with ST100,038 and ST100,045 as compared to unstimulated PBS and TSP616 controls.
- Figure 16 is a graph comparing inhibition of VEGF-mediated angiogenesis in vivo with ST100,038 and ST100,059 as compared to unstimulated PBS and TSP616 controls.
- Figure 16 is a graph comparing inhibition of VEGF-mediated angiogenesis in vivo with ST100,038 and ST100,059 as compared to unstimulated PBS and TSP616 controls.
- each group there are photographs of angioreactors after removal from mice treated with various peptides and represent a qualitative appreciation of the level of angiogenesis.
- Figure 17 is a graph comparing inhibition of the growth of a subcutaneous B16 melanoma tumor in C57BL/6 mice treated with 20 mg/kg, 40 mg/kg, 100 mg/kg daily ip of ST 100,059 to untreated controls.
- Figure 18 is a graph comparing the number of Bl 6 melanoma lung metastases in mice treated with ST100,059 administered ip either 100 mg/kg daily or 100 mg/kg every 2 days to untreated controls.
- Figure 19 is a graph comparing caliper measurements and actual tumor weights of the human breast cancer tumor line MDA-MB231 in mice treated with vehicle, docetaxel, 10 mg/kg daily or 20 mg/kg daily of ST100,059.
- Figure 20 is a graph comparing the number of animals with tumor necrosis and the extent of necrosis for each MDA-MB231 human breast cancer tumor in mice treated with vehicle, 10 mg/kg daily or 20 mg/kg daily of ST100,059.
- Figure 21 is a graph showing that increasing concentrations of the peptide 5 ST 100,059 reduce the level of protein kinase MPK phosphorylation in HUVEC.
- Figure 22 is an image showing that the peptide ST100,059 regulates VEGF induced gene expression changes, using the Down Syndrome critical region gene 1 as an example.
- Figure 23 is an image showing that the peptide STl 00,059 regulates VEGF - -1-0-—- induced gene expression changes, using the peptidyl arginine deiminase type 1 gene as an example.
- anti-angiogenic means that the peptides of the invention block, inhibit or reduce the process of angiogenesis, or the process by which new blood vessels form by developing from pre-existing vessels.
- Such peptides can block angiogenesis by blocking or reducing any of the steps involved in angiogenesis, including the steps of (1) dissolution of the
- the peptides of the invention block, inhibit or reduce VEGF-induced stimulation of endothelial cell activation or proliferation, as may be detected or measured using any one or more of the assays described herein or in the available literature.
- the ability of the disclosed peptides to inhibit or reduce VEGF-induced stimulation may be measured by incubating the disclosed peptides in the presence of VEGF and monitoring any reduction in the proliferation or survival of bovine retinal endothelial cells (BRE) or human umbilical vein endothelial cells (HUVEC) as described herein.
- endothelial cell stimulation may also be used, including detecting the effect of the peptides on the expression of one or more antiapoptotic proteins such as Bcl-2 or Al (see Gerber et al, 1998, J. Biol. Chem. 273(21): 133313- 16), or the effect of the peptides on the phosphorylation or dephosphorylation of VEGF " " signal transducing proteins such as Akt (see Gerber et ah, 1998, 273(46): 30336-43).
- antiapoptotic proteins such as Bcl-2 or Al
- signal transducing proteins such as Akt (see Gerber et ah, 1998, 273(46): 30336-43).
- the peptides of the invention also block, inhibit or reduce VEGF binding to the KDR, as may be detected or measured using the disclosed mini peptide display technology, or any known competitive or non-competitive KDR binding assay.
- labeled minicells or any other cell expressing a peptide of the invention may be used to detect or measure binding of the disclosed peptides to the KDR.
- the present invention also encompasses labeled peptide derivatives of any of the peptides disclosed herein, wherein the peptide is conjugated or complexed to a detectable label such as a radioactive, fluorescent, luminescent, proteogenic, immunogenic or any other suitable molecule.
- a detectable label such as a radioactive, fluorescent, luminescent, proteogenic, immunogenic or any other suitable molecule.
- polypeptide and refers to a molecule comprising a sequence of at least six amino acids, but does not refer to polypeptide sequences of whole, native or naturally occurring proteins.
- the peptides of the invention have at least six amino acids and preferably not more than about 100, 75, 50, 40, 30, 25, 20 or 15 amino acids. Most preferred peptides of the invention will have at least about six amino acids but no more than about 12 amino acids.
- LPPHSS LPPHSS
- This core consensus sequence was further expanded by homology alignment to include at least one or more of the N-terminal amino acids ATS, and/or at least one or more of the C- terminal amino acids QSP, creating expanded consensus sequences of ATSLPPHSS (SEQ ID No. 10), LPPHSSQSP (SEQ ID No. 13) and ATSLPPHSSQSP (SEQ ID No. 16).
- Peptides comprising the amino acid sequence of SEQ ID No. 16 in particular have been shown to demonstrate a significantly lower IC 50 of about 40 micromolar versus about 200 micromolar when compared to previously known peptides. Accordingly, peptides of the present invention demonstrate the functional attributes of anti-angiogenic activity, and may further block or reduce VEGF binding to KDR at a concentration of less than about 200 micromolar, more preferably at a concentration less than about 175, 150, 125, 100 or 75 micromolar, and most preferably at a concentration less than about 50 micromolar.
- Preferred peptides of the present invention include but are not limited to the following peptide sequences: LPPHSS (SEQ ID No. 1) SLPPHSS (SEQ ID No. 2) LPPHSSQ (SEQ ID No. 3) SLPPHSSQ (SEQ ID No. 4) TSLPPHSS (SEQ ID No. 5)
- SLPPHSSQS (SEQ ID No. 8) TSLPPHSSQS (SEQ ID No. 9) ATSLPPHSS (SEQ ID No. 10)
- ATSLPPHSSQSPL (SEQ ID NO. 18)
- ATSLPPHSSQSPRAL (SEQ ID NO. 19)
- SLPPRALQ (SEQ ID No. 20)
- TSLPPRALQ (SEQ ID No. 23) SLPPRALQS (SEQ ID No. 24) TSLPPRALQS (SEQ ID NO. 25) ATSLPPRAL (SEQ ID No. 26) ATSLPPRALQ (SEQ ID NO. 27) ATSLPPRALQS (SEQ ID NO. 28)
- TSLPPRALQSP (SEQ ID NO. 31) ATSLPPRALQSP (SEQ ID NO. 32) WLPPHSS (SEQ ID No. 33)
- ATWLPPHSSQSP (SEQ ID NO. 34)
- Peptides of the invention may "comprise" the disclosed sequences, i.e., where the disclosed sequence is part of a larger peptide sequence that may or may not provide additional functional attributes to the disclosed peptide, such as enhanced solubility and/or stability, fusion to marker proteins for monitoring or measuring peptide activity or binding, larger peptides comprising immunogenic or antigenic peptides, etc.
- Preferred peptides of the invention may be described as including sequences “consisting essentially” of the disclosed sequences in addition to extraneous sequences which do not affect the anti-angiogenic activity and functional binding properties of the peptides.
- the peptides of the invention may consist only of the disclosed peptide sequences.
- sequences of the core peptides can be modified via conservative substitutions and/or by chemical modification or conjugation to other molecules in order to enhance parameters like solubility, serum or plasma stability, etc, while retaining anti-angiogenic activity and binding to KDR.
- the peptides of the invention may be acetylated at the N-terminus and/or amidated at the C-terminus, or conjugated, complexed or fused to molecules that enhance serum stability, including but not limited to albumin, immunoglobulins and fragments thereof, transferrin, lipoproteins, liposomes, ⁇ -2-macroglobulin and ⁇ -1 -glycoprotein, polyethylene glycol and dextran.
- Retro inverso peptides have been shown to be more suitable for pharmaceutical development, while they retain biological in vitro activity, they are also serum protease resistant, resulting in enhanced in vivo biological activity.
- the peptide may be modified by reducing one or more of the peptide bands to enhance stability (Pennington "solid-phase synthesis of peptides containing the CH 2 NH reduced band surrogate" in Molecular Biology, ed M. W. Pennington and B. M. Dunn 35(1994) 241-247 Humana Press Inc., Totowa, NJ).
- Conservative amino acid substitutions may be made with either naturally or non- naturally occurring amino acids. Appropriate conservative substitutions may be determined using any known scoring matrix or standard similarity comparison, including but not limited to the substitutions described in the following: Bordo and Argos, Suggestions for 'Safe' Residue Substitutions in Site-Directed Mutagensis, J. MoI. Biol.
- the present invention also encompasses antibodies that specifically bind to the peptides disclosed herein.
- exemplary antibodies include polyclonal, monoclonal, humanized, fully human, chimeric, bispecific, and heteroconjugate antibodies.
- Monoclonal antibodies may be prepared using hybridoma methods, such as those described by Kohler and Milstein, Nature 256:495 (1975), which is herein incorporated by reference.
- lymphocytes may be immunized in vitro.
- the immunizing agent will typically include the peptide or a fusion protein thereof, further comprising a carrier or adjuvant protein.
- Anti-idiotypic antibodies may also be prepared using standard procedures that exhibit properties substantially similar to the peptides as herein described. Such antibodies may therefore be used to inhibit or reduce VEGF-mediated stimulation of endothelial cells in the same manner as the disclosed peptides. Antibodies specific for the disclosed peptides may be labeled and used to detect the peptide, for instance in any of the receptor binding assays described herein. Alternatively, such antibodies may be used to purify recombinantly synthesized peptide.
- Nucleic Acids The present invention also encompasses isolated nucleic acids encoding the peptides described herein, as well as vectors comprising such nucleic acids for cloning (amplification of the DNA) or for expression.
- Various vectors are publicly available.
- the vector may, for example, be in the form of a plasmid, cosmid, viral particle, or phage.
- Such nucleic acids may be used to produce the peptide substrate, for instance by expressing the nucleic acid in a host cell.
- nucleic acid sequences may encode the same amino acid sequence due to the degeneracy of the triplet code, and that the invention encompasses all possible nucleic acid sequences coding for the peptides described herein.
- nucleic acids may be synthetically prepared and cloned into any suitable vector using methods that are well known in the art. Using well known cloning techniques, peptide coding sequences may be fused in frame to a signal sequence to allow secretion by the host cell. Alternatively, such peptides may be produced as a fusion to another protein, and thereafter separated and isolated by the use of a site specific protease. Such systems for producing peptides and proteins are commercially available.
- host cells in methods for detecting expression of KDR by a test cell, or in methods of detecting VEGF activity in a sample, for instance by mixing a test cell or a sample with a host cell expressing a peptide of the invention and detecting binding of said host cell or said peptide or by detecting inhibition of VEGF activity.
- Suitable host cells include eukaryotic and prokaryotic cells. Vectors containing promoters for protein expression in specific host cells of interest are known and publicly available.
- Nucleic acids and expression vectors encoding peptides of the invention may also be used in the therapeutic methods described herein, for instance as gene therapy vehicles to deliver the expressed peptide to the disease site.
- Suitable vectors are typically viral vectors, including DNA viruses, RNA viruses, and retroviruses (see Scanlon, 2004, Anticancer Res. 24(2A):501-4, for a recent review, which is herein incorporated by reference in its entirety).
- Controlled release systems fabricated from natural and synthetic polymers, are also available for local delivery of vectors, which can avoid distribution to distant tissues, decrease toxicity to nontarget cells, and reduce the immune response to the vector (Pannier and Shea, 2004, MoI. Ther. 10(1): 19-26).
- the peptides of the present invention may be used in a variety of methods, including but not limited to methods of detecting KDR expression and methods of detecting and/or inhibiting VEGF/receptor interaction.
- the peptides of the invention may be conjugated to radioactive or fluorescent imaging markers for the detection of KDR expressing cells in vivo. Detection of aberrant or increased KDR expression could be an indication of ongoing disease, and could be used to localize malignant tumors or diagnose eye diseases associated with excessive intraocular neovascularization.
- the present invention also encompasses methods of using the peptides disclosed herein to screen for compounds that mimic the disclosed peptides (agonists) or prevent the effect of the peptides (antagonists).
- Screening assays for antagonist drug candidates are designed to identify compounds that bind to KDR, or otherwise interfere with the interaction of the disclosed peptides with KDR.
- Such screening assays will include assays amenable to high-throughput screening of chemical libraries, making them particularly suitable for identifying small molecule drug candidates.
- the assays can be performed in a variety of formats, including protein-protein binding assays, biochemical screening assays, immunoassays, and cell-based assays, which are well characterized in the art.
- antagonists may be detected by combining a peptide of the invention and a potential antagonist with membrane-bound or surface-bound KDR or recombinant receptors under appropriate conditions for a competitive inhibition assay.
- the peptide of the invention can be labeled, such as by radioactivity or fluorescence, such that the number of peptide molecules bound to the receptor can be used to determine the effectiveness of the potential antagonist.
- the invention also encompasses methods for reducing VEGF-mediated angiogenesis, and for blocking VEGF binding to KDR or a KDR peptide, comprising contacting a cell expressing kinase domain receptor (KDR) with the peptides described herein such that VEGF- mediated angiogenesis or VEGF binding, respectively, is reduced.
- KDR kinase domain receptor
- the KDR or receptor peptide may be contacted with the peptide of the invention in the presence of VEGF or prior to being exposed to VEGF.
- Either the KDR or the peptide of the invention may be displayed on a synthetic surface, such as in a protein or peptide array.
- the KDR or KDR peptide may be . expressed on the surface of a cell.
- KDR-expressing cells to be targeted by the methods of the invention can include either or both prokaryotic and eukaryotic cells. Such cells may be maintained in vitro, or they may be present in vivo, for instance in a patient or subject diagnosed with cancer or another angiogenesis-related disease.
- the present invention also includes methods of treating a patient diagnosed with an angiogenesis-related disease with a therapeutically effective amount of any of the peptides described herein, comprising administering said peptide to said patient such that said angiogenesis-related disease is reduced or inhibited.
- angiogenesis-related diseases include but are not limited to diseases selected from the group consisting of tumors and neoplasias, hemangiomas, rheumatoid arthritis, atherosclerosis, idiopathic pulmonary fibrosis, vascular restenosis, arteriovenous malformations, meningioma, neovascular glaucoma, psoriasis, angiofibroma, hemophilic joints, hypertrophic scars, Osier-Weber syndrome, pyogenic granuloma, retrolental fibroplasias, scleroderma, trachoma, vascular adhesion pathologies, synovitis, dermatitis, endometriosis, pterygium, diabetic retinopathy, neovascularization associated with corneal injury or grafts, wounds, sores, and ulcers (skin, gastric and duodenal).
- the invention includes methods of treating a patient diagnosed with cancer with a therapeutically effective amount of any of the peptides described herein, comprising administering said peptide to said patient such that spread of said cancer is reduced or inhibited.
- Cancers treatable by the methods of the present invention include all solid tumor and metastatic cancers, including but not limited to those selected from the group consisting of kidney, colon, ovarian, prostate, pancreatic, lung, brain and skin cancers.
- the present invention also includes methods of treating a patient diagnosed with an angiogenesis-associated eye disease with a therapeutically effective amount of any of the peptides described herein, comprising administering said peptide to said patient such that said eye disease is reduced or inhibited.
- eye diseases include any eye disease associated with abnormal intraocular neovascularization, including but not limited to retinopathy of prematurity, diabetic retinopathy, retinal vein occlusion, and macular degeneration.
- the present invention also includes methods of treating a patient diagnosed with an angiogenesis-associated inflammatory condition with a therapeutically effective amount of any of the peptides described herein, comprising administering said peptide to said patient such that said inflammatory condition is reduced or inhibited.
- inflammatory conditions or diseases include any inflammatory disorder associated with expression of VEGF and activation of cells by VEGF, including but not limited to all types of arthritis and particularly rheumatoid arthritis and osteoarthritis, asthma, pulmonary fibrosis and dermatitis.
- the compounds of the present invention may be used in combination with a pharmaceutically acceptable carrier, and can optionally include a pharmaceutically acceptable diluent or excipient.
- the present invention thus also provides pharmaceutical compositions suitable for administration to a subject.
- the carrier can be a liquid, so that the composition is adapted for parenteral administration, or can be solid, i.e., a tablet or pill formulated for oral administration. Further, the carrier can be in the form of a nebulizable liquid or solid so that the composition is adapted for inhalation. When administered parenterally, the composition should be pyrogen free and in an acceptable parenteral carrier. Active compounds can alternatively be formulated or encapsulated in liposomes, using known methods.
- compositions of the invention comprise an effective amount of one or more peptides of the present invention in combination with the pharmaceutically acceptable carrier.
- the compositions may further comprise other known drugs suitable for the treatment of the particular disease being targeted.
- An effective amount of the compound of the present invention is that amount that blocks, inhibits or reduces VEGF stimulation of endothelial cells compared to that which would occur in the absence of the compound; in other words, an amount that decreases the angiogenic activity of the endothelium, compared to that which would occur in the absence of the compound.
- the effective amount (and the manner of administration) will be determined on an individual basis and will be based on the specific therapeutic molecule being used and a consideration of the subject (size, age, general health), the condition being treated (cancer, arthritis, eye disease, etc.), the severity of the symptoms to be treated, the result sought, the specific carrier or pharmaceutical formulation being used, the route of administration, and other factors as would be apparent to those skilled in the art.
- the effective amount can be determined by one of ordinary skill in the art using techniques as are known in the art.
- Therapeutically effective amounts of the compounds described herein can be determined using in vitro tests, animal models or other dose-response studies, as are known in the art. -
- compositions of the invention may be prepared, packaged, or sold in formulations suitable for oral, rectal, vaginal, parenteral, topical, pulmonary, intranasal, buccal, ophthalmic, intrathecal or another route of administration.
- Other contemplated formulations include projected nanoparticles, liposomal preparations, and immunologically based formulations.
- Liposomes are completely closed lipid bilayer membranes which contain entrapped aqueous volume. Liposomes are vesicles which may be unilamellar (single membrane) or multilamellar (onion-like structures characterized by multiple membrane bilayers, each separated from the next by an aqueous layer).
- the bilayer is composed of two lipid monolayers having a hydrophobic "tail” region and a hydrophilic "head” region, hi the membrane bilayer, the hydrophobic (nonpolar) "tails” of the lipid monolayers orient toward the center of the bilayer, whereas the hydrophilic (polar) "heads” orient toward the aqueous phase.
- the liposomes of the present invention may be formed by any of the methods known in the art. Several methods may be used to form the liposomes of the present invention. For example, multilamellar vesicles (MLVs), stable plurilamellar vesicles (SPLVs), small unilamellar vesicles (SUV), or reverse phase evaporation vesicles (REVs) may be used. Preferably, however, MLVs are extruded through filters forming large unilamellar vesicles (LUVs) of sizes dependent upon the filter size utilized. In general, polycarbonate filters of 30, 50, 60, 100, 200 or 800 nm pores may be used.
- LUVs large unilamellar vesicles
- the liposome suspension may be repeatedly passed through the extrusion device resulting in a population of liposomes of homogeneous size distribution.
- the filtering may be performed through a straight-through membrane filter (a Nuclepore polycarbonate filter) or a tortuous path filter (e.g. a Nuclepore Membrafil filter (mixed cellulose esters) of 0.1 ⁇ m size), or by alternative size reduction techniques such as homogenization.
- the size of the liposomes may vary from about 0.03 to above about 2 microns in diameter; preferably about 0.05 to 0.3 microns and most preferably about 0.1 to about 0.2 microns.
- the size range includes liposomes that are MLVs, SPLVs 5 or LUVs.
- Lipids which can be used in the liposome formulations of the present invention include synthetic or natural phospholipids and may include phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylserine (PS), phosphatidylglycerol (PG), phosphatidic acid (PA), phosphatidylinositol (PI), sphingomyelin (SPM) and cardiolipin, among others, either alone or in combination, and also in combination with cholesterol.
- the phospholipids useful in the present invention may also include dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylglycerol (DMPG).
- distearoylphosphatidylcholine DSPC
- dipalmitoylphosphatidylcholine DPPC
- hydrogenated soy phosphatidylcholine HSPC
- Dimyristoylphosphatidylcholine DMPC
- diarachidonoylphosphatidylcholine DAPC
- organic solvents may also be used to suspend the lipids.
- Suitable organic solvents for use in the present invention include those with a variety of polarities and dielectric properties, which solubilize the lipids, for example, chloroform, methanol, ethanol, dimethylsulfoxide (DMSO), methylene chloride, and solvent mixtures such as benzene:methanol (70:30), among others.
- DMSO dimethylsulfoxide
- solvent mixtures such as benzene:methanol (70:30)
- Solvents are generally chosen on the basis of their biocompatability, low toxicity, and solubilization abilities.
- Liposomes containing the amino acid and peptide formulations of the present invention may be used therapeutically in mammals, especially humans, in the treatment of a number of disease states or pharmacological conditions which require sustained release formulations as well as repeated administration.
- the mode of administration of the liposomes containing the agents of the present invention may determine the sites and cells in the organism to which the peptide may be delivered.
- the liposomes of the present invention may be administered alone but will generally be administered in admixture with a pharmaceutical carrier selected with regard to the intended route of administration and standard pharmaceutical practice.
- the preparations may be injected parenterally, for example, intravenously.
- parenteral administration they can be used, for example, in the form of a sterile aqueous solution which may contain other solutes, for example, enough salts or glucose to make the solution isotonic, should isotonicity be necessary or desired.
- the liposomes of the present invention may also be employed subcutaneously or intramuscularly. Other uses, depending upon the particular properties of the preparation, may be envisioned by those skilled in the art.
- the liposomal formulations of the present invention can be used in the form of tablets, capsules, lozenges, troches, powders, syrups, elixirs, aqueous solutions and suspensions, and the like.
- carriers which can be used include lactose, sodium citrate and salts of phosphoric acid.
- Various disintegrants such as starch, lubricating agents, and talc are commonly used in tablets.
- useful diluents are lactose and high molecular weight polyethylene glycols.
- aqueous suspensions are required for oral use, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening and/or flavoring agents can be added.
- the liposomal formulations of the present invention may be incorporated into dosage forms such as gels, oils, emulsions, and the like. These formulations may be administered by direct application as a cream, paste, ointment, gel, lotion or the like.
- the prescribing physician will ultimately determine the appropriate dosage of the agent for a given human subject, and this can be expected to vary according to the age, weight and response of the individual as well as the pharmacokinetics of the agent used.
- the nature and severity of the patient's disease state or condition will influence the dosage regimen. While it is expected that, in general, the dosage of the drug in liposomal form will be about that employed for the free drug, in some cases, it may be necessary to administer dosages outside these limits.
- compositions of the invention further comprise a depot formulation of biopolymers such as biodegradable microspheres.
- biodegradable microspheres are used to control drug release rates and to target drugs to specific sites in the body, thereby optimizing their therapeutic response, decreasing toxic side effects, and eliminating the inconvenience of repeated injections.
- Biodegradable microspheres have the advantage over large polymer implants in that they do not require surgical procedures for implantation and removal.
- biodegradable microspheres used in the context of the invention are formedb with a polymer which delays the release of the peptides and maintains, at the site of action, a therapeutically effective concentration for a prolonged period of time.
- the polymer can be chosen from ethylcellulose, polystyrene, poly(e- caprolactone), poly(lactic acid) and poly(lactic acid-co-glycolic acid) (PLGA).
- PLGA copolymer is one of the synthetic biodegradable and biocompatible polymers that has reproducible and slow-release characteristics.
- An advantage of PLGA copolymers is that their degradation rate ranges from months to years and is a function of the polymer molecular weight and the ratio of polylactic acid to polyglycolic acid residues.
- compositions of the invention may further be prepared, packaged, or sold in a formulation suitable for nasal administration as increased permeability has been shown through the tight junction of the nasal epithelialium (Pietro and Woolley, The Science behind Nastech's intranasal drug delivery technology.
- Such formulations may comprise dry particles which comprise the active ingredient and which have a diameter in the range from about 0.5 to about 7 nanometers, and preferably from about 1 to about 6 nanometers.
- Such compositions are conveniently in the form of dry powders for administration using a device comprising a dry powder reservoir to which a stream of propellant may be directed to disperse the powder or using a self-propelling solvent/powder-dispensing container such as a device comprising the active ingredient dissolved or suspended in a low-boiling propellant in a sealed container.
- such powders comprise particles wherein at least 98% of the particles by weight have a diameter greater than 0.5 nanometers and at least 95% of the particles by number have a diameter less than 7 nanometers. More preferably, at least 95% of the particles by weight have a diameter greater than 1 nanometer and at least 90% of the particles by number have a diameter less than 6 nanometers.
- Dry powder compositions preferably include a solid fine powder diluent such as sugar and are conveniently provided in a unit dose form.
- Low boiling propellants generally include liquid propellants having a boiling point of below 65° F at atmospheric pressure. Generally the propellant may constitute 50 to 99.9% (w/w) of the composition, and the active ingredient may constitute 0.1 to 20% (w/w) of the composition.
- the propellant may further comprise additional ingredients such as a liquid non-ionic or solid anionic surfactant or a solid diluent (preferably having a particle size of the same order as particles comprising the active ingredient).
- compositions of the invention formulated for nasal delivery may also provide the active ingredient in the form of droplets of a solution or suspension.
- Such formulations may be prepared, packaged, or sold as aqueous or dilute alcoholic solutions or suspensions, optionally sterile, comprising the active ingredient, and may conveniently be administered using any nebulization or atomization device.
- Such formulations may further comprise one or more additional ingredients including, but not limited to, a flavoring agent such as saccharin sodium, a volatile oil, a buffering agent, a surface active agent, or a preservative such as methylhydroxybenzoate.
- the droplets provided by this route of administration preferably have an average diameter in the range from about 0.1 to about 200 nanometers.
- formulation suitable for intranasal administration is a coarse powder comprising the active ingredient and having an average particle from about 0.2 to 500 micrometers. Such a formulation is administered in the manner in which snuff is taken i.e. by rapid inhalation through the nasal passage from a container of the powder held close to the nares.
- Formulations suitable for nasal administration may, for example, comprise from about as little as 0.1% (w/w) and as much as 100% (w/w) of the active ingredient, and may further comprise one or more of the additional ingredients described herein.
- the compounds of the present invention can be administered acutely (i.e., during the onset or shortly after events leading to inflammation), or can be administered during the course of a degenerative disease to reduce or ameliorate the progression of symptoms that would otherwise occur.
- the timing and interval of administration is varied according to the subject's symptoms, and can be administered at an interval of several hours to several days, over a time course of hours, days, weeks or longer, as would be determined by one skilled in the art.
- a typical daily regime can be from about O.Ol ⁇ g/kg body weight per day, from about 1 mg/kg body weight per day, from about 10 mg/kg body weight per day, from about 100 mg/kg body weight per day.
- the compounds of the invention may be administered intravenously, orally, intranasally, intraocularly, intramuscularly, intrathecally, or by any suitable route in view of the peptide, the peptide formulation and the disease to be treated.
- Peptides for the treatment of inflammatory arthritis can be injected directly into the synovial fluid.
- Peptides for the treatment of solid tumors may be injected directly into the tumor.
- Peptides for the treatment of skin diseases maybe applied topically, for instance in the form of a lotion or spray.
- Intrathecal administration i.e. for the treatment of brain tumors, can comprise injection directly into the brain.
- peptides may be coupled or conjugated to a second molecule (a "carrier"), which is a peptide or non-proteinaceous moiety selected for its ability to penetrate the blood-brain barrier and transport the active agent across the blood-brain barrier.
- a carrier a peptide or non-proteinaceous moiety selected for its ability to penetrate the blood-brain barrier and transport the active agent across the blood-brain barrier.
- An alternative method of administering peptides of the present invention is carried out by administering to the subject a vector carrying a nucleic acid sequence encoding the peptide, where the vector is capable of directing expression and secretion of the peptide.
- Suitable vectors are typically viral vectors, including DNA viruses, RNA viruses, and retroviruses. Techniques for utilizing vector delivery systems and carrying out gene therapy are known in the art (see Lundstrom, 2003, Trends Biotechnol. 21(3): 117-22, for a recent review). The following examples are provided to describe and illustrate the present invention. As such, they should not be construed to limit the scope of the invention. Those in the art will well appreciate that many other embodiments also fall within the scope of the invention, as it is described herein above and in the claims.
- a minicell display library comprising random 30-mer oligonucleotides genetically fused to the gene encoding the 17K antigen of Rickettsia rickettsii in the vector pBS (Bluescript) was constructed essentially as described in U.S. patent application 20030105310, which is herein incorporated by reference in its entirety.
- the library was transformed into E. coli DS410, and transformed cells were grown in a 250 mL culture overnight in rich medium (Terrific Broth). Minicells were purified by differential centrifugation at 9.3 K rpm.
- Costar high binding plate 3361 was coated with 5 ⁇ g/ml KX)R (R&D systems, 357-KD) diluted with 100 mM sodium bicarbonate 30 mM sodium carbonate pH
- Coating buffer 50 ⁇ l/ well. Coating buffer was added alone to two wells as negative control wells.
- PBS PBS with 500 mM NaCl, PBS with IM NaCl, PBS + 0.2% NP-40, PBS + 0.02% SDS) and loaded 50 ⁇ l/ well with 0.1% BSA and 25 ⁇ g/ml kanamycin. Minicells were added to control wells as well.
- the plate was washed 3 times for 1 min with 200 ⁇ l of appropriate buffer — PBS, PBS with 250 mM NaCl, PBS with 500 mM NaCl, PBS + 0.1% NP-40, PBS + 0.01 % SDS. 50 ⁇ l PBS/ well was added and plate was incubated three hours at 4°C.
- DNA was miniprepped from 1.5 mL of culture via the Qiagen method and processed for sequencing. 14. Sequences were compared to literature for sequences having significant homology.
- Binetruy-Tournaire R Delow C, Malavaud B, Vassy R, Rouyre S, Kraemer M, Plouet J, Derbin C, Perret G, Mazie JC, 2000, Identification of a peptide blocking vascular endothelial growth factor (VEGF)-mediated angiogenesis, EMBO J. 19(7): 1525-33.
- Lu D Shen J, ViI MD, Zhang H, Jimenez X, Bohlen P, Witte L, Zhu Z., 2003, Tailoring in vitro selection for a picomolar affinity human antibody directed against vascular endothelial growth factor receptor 2 for enhanced neutralizing activity, J. Biol. Chem. 278(44):43496-507.
- Binetruy-Tournaire et al. used immobilized KDR to screen a phage display library.
- Lu et al. used a phage display library to further define the fine binding specificities of two fully human neutralizing KDR-specific antibodies.
- Figure 1 By comparing the clones identified by minicell display screening with the peptides disclosed in the two papers referenced above, a series of subgroups was identified (see Figure 1, a phylogenetic tree generated by custalW using Vector NTI). Of particular interest is the subgroup at the top of the alignment tree, comprising the peptides: EmboK4 (SEQ ID No. 38), EmboK5 (SEQ JX) No. 39) and EmboV4 (SEQ ID No.
- the homology alignment revealed two further regions of consensus.
- the region ATS that is present in the amino terminal portion of the peptide IAl 1 is partially conserved in the EmboVl (see Figure 2).
- the serine residue is present in alignment in EmboK4. Accordingly, the present inventors also predicted that this region would contribute anti-angiogenic properties, and that a peptide with the sequence ATSLPPHSS (SEQ ID No. 10) would have anti-angiogenic properties substantially different and more useful than either of the three isolated sequences alone.
- the other region of homology covers the subsequence QSP, present in the C-terminal region of peptide IAl 1 and in the peptide K3.
- the serine is conserved in the peptide EmboK3.
- the present inventors also predicted that this region would contribute anti-angiogenic properties, and that a peptide with the sequence ATSLPPHSSQSP (SEQ ID NO. 16) would have anti-angiogenic properties substantially different and more useful than any of the four isolated sequences alone.
- ST 100,038 were synthesized using D-amino acids as opposed to L-amino acids to test the effect of the modification on activity and serum stability: STl 00,045 ATSLPPHSSQSP (SEQ ID No. 16)
- the anti-angiogenic activities of the peptides were tested by measuring the level of inhibition of VEGF mediated survival/proliferation of bovine retinal endothelial cells (BRE), a standard cell line used to test anti-angiogenic compounds. Cells were maintained in Cambrex EGM-2MV medium. On day one cells were starved for either 6
- BRE bovine retinal endothelial cells
- fetal bovine serum + 1% fetal bovine serum was then added to the wells in addition to, where appropriate, VEGF to a final concentration of 25 ng/rhl and the various peptides to final concentration
- Table 2 reports the amount of WST-I -induced colorimetric change measured at 440 nm.
- the data points for each treatment are averaged and presented underneath the peptide name.
- the VEGF+/- wells are averaged and presented next to the correspondent definition.
- the Student's t-test values between the peptide treated wells and the VEGF only wells are calculated in the column next to the average.
- the average of the 3 wells for each data point is graphed in Figure 4, and indicates how increasing concentrations of peptide decrease the amount of WST-I and therefore the number of live cells. Student's t-test analysis of the data reveals that these decreases are statistically significant for the two highest concentrations of STl 00,038, which appears to be the most active peptide as postulated. Concentrations above 25 ⁇ g/ml completely abolished the statistically significant VEGF-induced increase in WST-I value" and actually resulted in even lower values than observed in cells without VEGF stimulation. The most likely explanation is that the peptide inhibits the stimulation of the cells by the growth factors (VEGF) present in the medium.
- VEGF growth factors
- Figure 5 depicts photomicrographs showing examples of the number and morphology of cells exposed to various treatments. Of particular note is the well treated with 100 ⁇ g/ml of ST100,038, which contains very few cells. The few cells that are present show signs of apoptosis (cell death). This is in contrast to the positive control (cells treated with VEGF) and is similar to the cells that received no VEGF.
- OptiMem + 1% fetal bovine serum was then added to the wells, further containing, where appropriate, VEGF to a final concentration of 25 ng/ml and the various peptides to final concentration of 25, 50, 100 and 200 ⁇ g/ml. After 72 hours incubation, the amount of live cells in each well was measured using the WST-I assay (Roche).
- Table 3 reports the amount of WST-I -induced colorimetric change measured at 440 nm.
- the data points for each treatment are averaged and presented underneath the peptide name.
- the VEGF+/- wells are averaged and presented next to the correspondent definition.
- the Student's t-test values between the peptide treated wells and the VEGF only wells are calculated in the column next to the average.
- OptiMem+Pen/Strep+10% fetal bovine serum The diluted samples were placed in a 24-well tissue culture plate in an incubator at 37 degrees. Aliquots of 50-100 ⁇ l were removed at 4, 6, 18, 24, 48 and 72 hrs and frozen at -7O 0 C until analysis.
- ST100,045 has the same sequence of ST 100,038 but it is made with D-amino acids.
- ST 100,059 is the D-amino acid peptide with ' an inverted sequence (retro-inverso peptide). They were tested for serum stability using the protocol described above and did not degrade under any of the tested conditions.
- ST100,045 was then compared to that of ST1OO,O38.
- BRE were maintained in Cambrex EGM-2MV medium. On day one, cells were starved for either 6 hours or overnight, trypsinized and then plated in a 96 well
- OptiMem + 1% fetal bovine serum were added to the wells in addition to, where appropriate, VEGF to a final concentration of 25 ng/ml and the various peptides to
- the few cells that are present show sign of apoptosis (cell death). This is in contrast to the positive control (cells treated with VEGF) and is similar to cells that received no VEGF.
- the peptides were added to the wells after the cells had adhered overnight. On day one cells were starved for 6 hours, they were then trypsinized and plated in 96 well plate in 100 ⁇ l of OptiMem + 1% fetal bovine serum. The morning
- the data points for each treatment (75, 50, 30 or 10 ⁇ g/ml, respectively) are averaged and presented underneath the peptide name.
- the VEGF+/- wells are averaged and presented next to the correspondent definition.
- the Student's t-test values between the peptide treated wells and the VEGF only wells are calculated in the column next to the average.
- ST 100,038 and ST 100,045 with only ST 100,038 being able to inhibit the growth of BRE after they have adhered to the plate.
- Table 6 reports the repeat of adding ST100,038 and ST100,045 to BRE before they adhered.
- the data points for each treatment are averaged and presented underneath the peptide name.
- the VEGF+/- wells are averaged and presented next to the correspondent definition.
- the Student's t-test values between the peptide treated wells and the VEGF only wells are calculated in the column next to the average.
- VEGF vascular endothelial growth factor
- Table 8 reports the amount of WST-I induced colorimetric change measured at 440 nm.
- the VEGF+/- wells are averaged and presented next to the correspondent definition.
- the Student's t-test values between the peptide treated wells and the VEGF only wells are calculated in the column next to the average.
- the standard deviations (STD) are calculated in the column next to the Student's t-test.
- the average of the 4 wells for each data point is graphed ( Figure 13). Student's t-test analysis of the data reveals that the WST-I decreases are statistically significant for the 2 highest concentrations of ST 100,038 and for the highest concentration of ST100,059. Accordingly, ST100,059 has an inhibitory activity similar to ST100,038.
- the peptides of the invention were also tested in an in vivo model of anti- angiogenic activity.
- This model analyzes VEGF-induced angiogenesis as it occurs in angio-reactors filled with Matrigel in wild-type FVB/N mice (Guedez et al, 2003, Am. J. Pathol. 162:1431-1439).
- angio-reactors Sterile, polyethene tubing (0.14 cm internal diameter) is cut to standard 1 cm lengths using a plexiglass template and single edge razor blade. These tubes are sealed at one end with nail-polish. Into the tubes, 20 ⁇ l of Matrigel (growth factor free obtained from BD Biosciences) containing 500 ng/ml VEGF with or without the indicated peptides is injected. After one hour of polymerization of the Matrigel at room temperature the angio-reactors are subcutaneously implanted into both flanks of wild-type FVB/N female mice (8-10 weeks old).
- Matrigel growth factor free obtained from BD Biosciences
- angiogenesis in the angio-reactors is determined.
- Mice receive a lOO ⁇ l injection of 25 mg/ml of FITC-dextran in phosphate-buffered saline (PBS) via tail vein 20 minutes before collection of the angio-reactors.
- Quantification of vessel functionality is performed by removal of the Matrigel from the angio-reactors and the fluorescence is measured using a FLUOstar Galaxy microplate reader (excitation 485 nm, emission 520 nm, BMG Labtechnologies GmbH, Germany).
- the mean relative fluorescence ⁇ SD for 10 angio-reactors is determined and statistical analysis performed. 3.
- the different arms of the experiments must include 10 angio-reactors in 5 mice.
- the various groups of animals are listed below in Table 9.
- VEGF concentration 500 ng/ml matrigel (30 ⁇ l/angio-reactor)
- ThrombospoBdin peptide 616 SPWS SCS VTCGDGVITRIR (SEQ ID No. 45) (Iruela- Arispe et ⁇ /., 1999. Circ. 100:1423-1431).
- VEGF concentration 500 ng/ml matrigel (30 ⁇ l/angio-reactor)
- Thrombospondin peptide 616 SPWSSCSVTCGDGVITRIR (SEQ ID No. 45) (Iruela-
- Table 13 below contains a Bonferroni's Multiple Comparison Statistical Test of the various group.
- the graph in Figure 16 summarizing the results by reporting the median of the values, shows that ST100,038 and ST100,059 peptides clearly inhibit VEGF- mediated angiogenesis.
- STl 00,059 is more active than STl 00,038 and brings the level of angiogenesis down to that of the unstimulated PBS controls and similar to the level obtained with the TSP616 peptide. It is noteworthy that these results reflect what was seen in vitro using the BRE cells.
- comparison of experiments 1 and 2 reveals that the retro-inverso peptide ST100,059 is more active than ST100,045, the peptide generated by simply replacing L- amino acids with D-amino acids.
- the peptides of the invention were tested in an in vivo model of anti-tumor activity. This model compares the growth of subcutaneous B16 melanoma tumor either untreated or treated with either 20 mg/kg, 40 mg/kg, 100 mg/kg daily ip doses of ST100,059.
- mice Male C57BL/6 mice were obtained with a mean body weight of 20 ⁇ 2 g.
- Mouse B 16-Fl melanoma cells were implanted subcutaneously (5x10 5 cell per animal). Peptides (formulated in water) were administered ip daily starting the day after injection of cells. Tumors became palpable around 9 days after injection of the cells. Tumors were then measured every 2 days.
- Figure 17 is a graph comparing inhibition of growth of subcutaneous B16 melanoma tumor in vivo treated with 20 mg/kg, 40 mg/kg or 100 mg/kg daily ip of STl 00,059 as compared to untreated controls.
- STl 00,059 is able to inhibit the growth of subcutaneous B16 melanoma tumors in a statistically significant and dose responsive fashion. The testing of STl 00,059 in this model was repeated 2 times with similar results.
- Example 9 Characterization of Anti-metastatic Activity of KDR Binding Peptides in vivo
- the peptides of the invention were also tested in an in vivo melanoma lung metastasis model. This model compares the number and sizes of mouse B16 melanoma tumor lung metastases in mice either untreated or treated with 100 mg/kg daily ip of ST100,059.
- mice Male C57BL/6 mice were obtained with a mean body weight of 20 ⁇ 2 g.
- Mouse B 16-Fl melanoma cells were grown in culture, harvested at 85% confluence and inoculated (5 x 10 5 cells/mouse) in 100 ⁇ .1 saline via the lateral tail vein.
- mice were sacrificed under anesthesia, on day 14 and the lungs were fixed overnight in Bouin's fluid. Lung metastases were identified and counted in all lobes of lungs.
- the peptides of the invention were tested in an in vivo model of anti-tumor activity.
- This model compares the growth of the human breast cancer MDA-MB231 tumor xenografts in nude mice treated with 10 mg/kg or 20 mg/kg daily ip of ST100,059, docetaxel or saline.
- mice Female nude mice (nu/n ⁇ ) between 5 and 6 weeks of age weighing approximately 2Og were obtained from Harlan, Inc. Animals were implanted subcutaneously (s.c.) by trocar with fragments of human tumors harvested from s.c. grown tumors in nude mice hosts. When the tumors were approximately 60-75 mg in size (about 10-15 days following implantation), the animals were pair-matched into treatment and control groups. Each group contained 8-10 mice, each of which is ear- tagged and followed individually throughout the experiment. The administration of drugs or controls began the day the animals were pair- matched with tumor size of about 70 mg (Day 1). Mice were weighed and tumor measurements were obtained using calipers twice weekly, starting on Day 1.
- the anti-angio genie activities of the peptides were tested by measuring the level of inhibition of VEGF induced intracellular signaling in human umbilical vein endothelial cells (HUVEC), a standard cell line used to test anti-angiogenic compounds.
- VEGF stimulation of KDR in endothelial cells results in the phosphorylation of MAPK that is detected with antibodies specific for phosphorylated MAPK and not total MAPK.
- the graph of Figure 21 shows how increasing concentrations of ST100,059 reduced the level of MPK phoshorylation, as expected for a compound that blocks VEGF binding and therefore activation of its receptor, KDR.
- VEGF stimulation of the KDR in endothelial cells results in substantial changes in gene expression that has been previously characterized (see patent application 20020132978 Gerber et al.).
- Cells were maintained in M200 media (Cascade Biologicals). On day one, cells were starved overnight in 1% FBS in M200 medium (Cascade Biologicals). The morning after the medium was replaced with serum free medium (control) or medium containing 25 ng/ml of human VEGF165 +/- 200 microgram/ml of ST100,059 peptide and incubated for 24 hours.
- Affymetrix Human U133 Plus 2.0 arrays as described by the manufacturer.
- the resulting data were analyzed using the Affymetrix GCOS software. It employs statistical algorithms to calculate a quantitative value (Signal Intensity) and a qualitative value (Present or Absent) for each transcript on the array.
- the data from the 3 samples was then compared to identify those genes that are modulated, either upregulated or downregulated, by VEGF compared to control and whose levels are then brought back to levels similar to control after treatment with ST100,059.
- Figures 22 and 23 are graphical representations of the results. These results show that ST100,059 is able to inhibit VEGF induced gene expression changes for many genes previously described in the literature. Of interest are those genes described in Yang et al. which are specifically up regulated by the KDR selective mutant of VEGF considering that 059 only blocks VEGF binding to KDR and not FLT-I, the other receptor. OF those genes, several are also upregulated in our experiment and then completely inhibited by 059 including: hydroxysteroid (17-beta) dehydrogenase up 7x Stanniocalcin 1 up 2.4x, Insulin-like growth factor binding protein 5 up 4.5 x, gamma synuclein up 2 x and ets2 up 2.5 times.
- the gene Down Syndrome critical region gene 1 and the gene peptidyl arginine deiminase, type 1, are used as examples.
Abstract
Description
Claims
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CA002575622A CA2575622A1 (en) | 2004-08-06 | 2005-08-05 | Anti-angiogenic peptides and methods of use thereof |
EP05807487A EP1786451A4 (en) | 2004-08-06 | 2005-08-05 | Anti-angiogenic peptides and methods of use thereof |
JP2007525027A JP2008509157A (en) | 2004-08-06 | 2005-08-05 | Anti-angiogenic peptides and methods of use thereof |
US11/659,731 US20090047335A1 (en) | 2004-08-06 | 2005-08-05 | Anti-angiogenic peptides and methods of use thereof |
AU2005267734A AU2005267734A1 (en) | 2004-08-06 | 2005-08-05 | Anti-angiogenic peptides and methods of use thereof |
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US59905904P | 2004-08-06 | 2004-08-06 | |
US60/599,059 | 2004-08-06 |
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EP (1) | EP1786451A4 (en) |
JP (1) | JP2008509157A (en) |
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- 2005-08-05 CA CA002575622A patent/CA2575622A1/en not_active Abandoned
- 2005-08-05 US US11/659,731 patent/US20090047335A1/en not_active Abandoned
- 2005-08-05 JP JP2007525027A patent/JP2008509157A/en active Pending
- 2005-08-05 WO PCT/US2005/027883 patent/WO2006015385A2/en active Application Filing
- 2005-08-05 EP EP05807487A patent/EP1786451A4/en not_active Withdrawn
- 2005-08-05 AU AU2005267734A patent/AU2005267734A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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US20090047335A1 (en) | 2009-02-19 |
AU2005267734A1 (en) | 2006-02-09 |
WO2006015385A3 (en) | 2006-05-04 |
EP1786451A2 (en) | 2007-05-23 |
CA2575622A1 (en) | 2006-02-09 |
EP1786451A4 (en) | 2009-07-22 |
JP2008509157A (en) | 2008-03-27 |
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