EP0907661A1 - PROCEDES ET COMPOSITIONS SERVANT A L'INHIBITION DE L'ANGIOGENESE LIEE A LA PRESENCE DE alpha v beta 5 - Google Patents
PROCEDES ET COMPOSITIONS SERVANT A L'INHIBITION DE L'ANGIOGENESE LIEE A LA PRESENCE DE alpha v beta 5Info
- Publication number
- EP0907661A1 EP0907661A1 EP97927814A EP97927814A EP0907661A1 EP 0907661 A1 EP0907661 A1 EP 0907661A1 EP 97927814 A EP97927814 A EP 97927814A EP 97927814 A EP97927814 A EP 97927814A EP 0907661 A1 EP0907661 A1 EP 0907661A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- angiogenesis
- antagonist
- polypeptide
- tissue
- compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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Classifications
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
- C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
- C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
- C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
- C12N9/6489—Metalloendopeptidases (3.4.24)
- C12N9/6491—Matrix metalloproteases [MMP's], e.g. interstitial collagenase (3.4.24.7); Stromelysins (3.4.24.17; 3.2.1.22); Matrilysin (3.4.24.23)
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- C07C279/04—Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton
- C07C279/14—Derivatives of guanidine, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of guanidine groups bound to acyclic carbon atoms of a carbon skeleton being further substituted by carboxyl groups
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- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
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- C07C311/03—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton having the nitrogen atoms of the sulfonamide groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C311/06—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton having the nitrogen atoms of the sulfonamide groups bound to hydrogen atoms or to acyclic carbon atoms to acyclic carbon atoms of hydrocarbon radicals substituted by carboxyl groups
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/01—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms
- C07C311/10—Sulfonamides having sulfur atoms of sulfonamide groups bound to acyclic carbon atoms of a saturated carbon skeleton containing rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
- C07D263/02—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings
- C07D263/30—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D263/34—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D263/36—One oxygen atom
- C07D263/38—One oxygen atom attached in position 2
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/745—Blood coagulation or fibrinolysis factors
- C07K14/75—Fibrinogen
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2839—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2839—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily
- C07K16/2848—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily against integrin beta3-subunit-containing molecules, e.g. CD41, CD51, CD61
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2602/00—Systems containing two condensed rings
- C07C2602/36—Systems containing two condensed rings the rings having more than two atoms in common
- C07C2602/42—Systems containing two condensed rings the rings having more than two atoms in common the bicyclo ring system containing seven carbon atoms
Definitions
- the present invention relates generally to the field of medicine, and relates specifically to methods and compositions for inhibiting ⁇ v ⁇ 5 -mediated angiogenesis of tissues using antagonists of the vitronectin receptor ⁇ v ⁇ 5 .
- Integrins are a class of cellular receptors known to bind extracellular matrix proteins, and therefore mediate cell-cell and cell-extracellular matrix interactions, referred generally to as cell adhesion events.
- cell adhesion events Although many integrins and their respective ligands are described in the literature, the biological function of many of the integrins remains elusive.
- the integrin receptors constitute a family of proteins with shared structural characteristics of noncovalent heterodimeric glycoprotein complexes formed of a and ⁇ subunits.
- the vitronectin receptor named for its original characteristic of preferential binding to vitronectin, is now known to refer to three different integrins, designated ⁇ v ⁇ ,, ⁇ v ⁇ 3 and ⁇ v ⁇ 5 . Horton, Int. J. Exp. Pathol.. 71 :741 -759 (1990).
- ⁇ v ⁇ binds fibronectin and vitronectin.
- ⁇ v ⁇ 3 binds a large variety of ligands, including fibrin, fibrinogen, laminin, thrombospondin, vitronectin, von Willebrand's factor, osteospontin and bone sialoprotein I.
- ⁇ v ⁇ 5 binds vitronectin.
- the specific cell adhesion roles these three integrins play in the many cellular interactions in tissues are still under investigation. However, it is clear that there are different integrins with different biological functions as well as different integrins and subunits having shared biological specific
- RGD arginine-glycine- aspartic acid
- Angiogenesis also referred to as neovascularization, is a process of tissue vascularization that involves the growth of new developing blood vessels into a tissue.
- the process is mediated by the infiltration of endothelial cells and smooth muscle cells.
- the process is believed to proceed in any one of three ways: 1) The vessels can sprout from pre-existing vessels; 2) De novo development of vessels can arise from precursor cells (vasculogenesis); or 3) Existing small vessels can enlarge in diameter. Blood et al., Bioch. Biophys. Acta, 1032:89-118 (1990).
- Vascular endothelial cells are known to contain at least five RGD-dependent integrins, including the vitronectin receptor ( ⁇ v ⁇ 3 or ⁇ v ⁇ 5 ), the collagen Types I and IV receptor ( ⁇ , ⁇ ,), the laminin receptor ( ⁇ 2 ⁇ ) > the fibronectin/laminin/collagen receptor ( ⁇ 3 ⁇ ,) and the fibronectin receptor
- RGD-dependent integrins including the vitronectin receptor ( ⁇ v ⁇ 3 or ⁇ v ⁇ 5 ), the collagen Types I and IV receptor ( ⁇ , ⁇ ,), the laminin receptor ( ⁇ 2 ⁇ ) > the fibronectin/laminin/collagen receptor ( ⁇ 3 ⁇ ,) and the fibronectin receptor
- the smooth muscle cell is known to contain at least six RGD-dependent integrins, including ⁇ 5 ⁇ h ⁇ v ⁇ 3 and ⁇ v ⁇ 5 .
- Angiogenesis is an important process in neonatal growth, but is also important in wound healing and in the pathogenesis of a large variety of clinically important diseases including tissue inflammation, arthritis, psoriasis, cancer, diabetic retinopathy, macular degeneration and other neovascular eye diseases. These clinical entities associated with angiogenesis are referred to as angiogenic diseases. Folkman et al., Science. 235:442-447 (1987). Angiogenesis is generally absent in adult or mature tissues, although it does occur in wound healing and in the corpus luteum growth cycle. See, for example, Moses et al., Science. 248: 1408-1410 (1990).
- microvessels in vitro in collagen gel cultures is not a model for inhibition of angiogenesis in a tissue because it is not shown that the microvessel structures are the same as capillary sprouts or that the formation of the microvessel in collagen gel culture is the same as neo-vascular growth into an intact tissue, such as arthritic tissue, tumor tissue or disease tissue where inhibition of angiogenesis is desirable.
- ⁇ v ⁇ ⁇ in angiogenesis The role of ⁇ v ⁇ ⁇ in angiogenesis was recently confirmed. See, Brooks, et al. Science. 264:569-571 (1994). The integrin was shown to be expressed on blood vessels in human wound granulation tissue but not in normal skin. Monoclonal antibodies against the ⁇ v ⁇ 3 receptor inhibited angiogenesis induced by the growth factors (cytokines) basic fibroblast growth factor (bFGF) and tumor necrosis factor- ⁇ (TNF- ⁇ ), as well as by melanoma fragments. However, the antagonists only inhibited new and not preexisting vessels. In addition, specific linear and cyclic RGD-containing peptides were also shown to inhibit neovascularization.
- cytokines basic fibroblast growth factor
- TNF- ⁇ tumor necrosis factor- ⁇
- angiogenesis would be a useful therapy for restricting tumor growth.
- Inhibition of angiogenesis has been proposed by (1) inhibition of release of "angiogenic molecules” such as bFGF (basic fibroblast growth factor), (2) neutralization of angiogenic molecules, such as by use of anti-bFGF antibodies, and (3) inhibition of endothelial cell response to angiogenic stimuli.
- angiogenic molecules such as bFGF (basic fibroblast growth factor)
- neutralization of angiogenic molecules such as by use of anti-bFGF antibodies
- endothelial cell response to angiogenic stimuli This latter strategy has received attention, and Folkman et al., Cancer Biology.
- endothelial cell response inhibitors including collagenase inhibitor, basement membrane turnover inhibitors, angiostatic steroids, fungal-derived angiogenesis inhibitors, platelet factor 4, thrombospondin, arthritis drugs such as D-penicillamine and gold thiomalate, vitamin D 3 analogs, alpha-interferon, and the like that might be used to inhibit angiogenesis.
- endothelial cell response inhibitors including collagenase inhibitor, basement membrane turnover inhibitors, angiostatic steroids, fungal-derived angiogenesis inhibitors, platelet factor 4, thrombospondin, arthritis drugs such as D-penicillamine and gold thiomalate, vitamin D 3 analogs, alpha-interferon, and the like that might be used to inhibit angiogenesis.
- angiogenesis see Blood et al., Bioch. Biophys. Acta.. 1032:89-1 18 (1990), Moses et al., Science. 248:1408-1410 (1990), Ingber et al., Lab. Invest..
- integrin ⁇ v ⁇ 5 in angiogenesis has neither been suggested or identified until the present invention nor have any of the inhibitors of angiogenesis described in the foregoing references been targeted at inhibition of ⁇ v ⁇ 5 .
- no references, other than the present invention have implicated the ⁇ v ⁇ 5 integrin in neovascularization, particularly that induced by the growth factors, vascular endothelial growth factor (VEGF), transforming growth factor- ⁇ (TGF- ⁇ ) and epidermal growth factor (EGF).
- VEGF vascular endothelial growth factor
- TGF- ⁇ transforming growth factor- ⁇
- EGF epidermal growth factor
- VEGF in particular, is thought to be a major mediator of angiogenesis in a primary tumor and in ischemic ocular diseases.
- VEGF vascular endothelial growth factor
- VEGF is a 46 kilodalton (kDa) homodimer that is an endothelial cell-specific angiogenic (Ferrara et al., Endocrin. Rev.. 13:18-32 (1992)) and vasopermeable factor (Senger et al., Cancer Res.. 46:5629-5632 (1986)) that binds to high-affinity membrane-bound receptors with tyrosine kinase activity (Jakeman et al., J. Clin. Invest.. 89:244-253 (1992)). Activation of receptor tyrosine kinases has recently been shown to promote integrin- dependent cell migration on extracellular matrix proteins.
- VEGF vascular endothelial growth factor
- the Folkman et al. reference also summarizes the current clinical approaches used to control undesirable angiogenesis. Patients in clinical trials have received therapeutic treatments with angiogenic inhibitors including platelet factor 4, a fumagillin-derivative, carboxy-amino- triazole, and the like.
- angiogenic inhibitors including platelet factor 4, a fumagillin-derivative, carboxy-amino- triazole, and the like.
- no references or current therapeutic references correlate the expression of ⁇ v ⁇ 5 with angiogenesis, particularly that induced by VEGF.
- the present invention demonstrates that in addition to an ⁇ v ⁇ 3 -requiring angiogenesis pathway in tissues, a separate novel ⁇ v ⁇ 5 -dependent pathway also exists.
- the invention describes inhibitors of ⁇ v ⁇ 5 that can inhibit angiogenesis.
- the invention further describes that ⁇ v ⁇ 5 -mediated activity in promoting angiogenesis is correlated with growth factor (cytokine) activation of growth factor receptor tyrosine kinases and protein kinase C (PKC).
- the growth factors (cytokines) that function in this manner include vascular endothelial growth factor (VEGF), transforming growth factor- ⁇ (TGF- ⁇ ), epidermal growth factor (EGF), and the like.
- the invention therefore describes methods for inhibiting angiogenesis in a tissue comprising administering to the tissue a composition comprising an angiogenesis-inhibiting amount of an ⁇ v ⁇ s antagonist.
- the tissue to be treated can be any tissue in which inhibition of angiogenesis is desirable, such as diseased tissue where neovascularization is occurring.
- tissue include ocular tissue undergoing neovascularization, inflamed tissue, solid tumors, metastases, tissues undergoing restenosis, and the like tissues.
- the neovascularization associated with expression of ⁇ v ⁇ 5 is the result of exposure to the growth factors, VEGF, TGF- ⁇ and EGF.
- therapeutic methods directed to inhibiting VEGF-induced vascularization in tissues such as the eye where angiogenesis is pronounced in diseases, including diabetic retinopathy (also called proliferativc diabetic retinopathy), age-related macular degeneration, presumed ocular histoplasmosis, retinopathy of prematurity, sickle cell retinopathy and neovascular glaucoma.
- the therapeutic methods are directed to inhibiting angiogenesis that occurs in corneal neovascular disorders that include corneal transplantation, he ⁇ etic keratitis, luetic keratitis, pterygium, neovascular pannus associated with contact lens use, and the like.
- An ⁇ v ⁇ 5 antagonist for use in the present methods is capable of binding to ⁇ v ⁇ 5 and competitively inhibiting the ability of ⁇ v ⁇ 5 to bind to the natural vitronectin ligand.
- the antagonist exhibits specificity for ⁇ v ⁇ 5 over other integrins.
- the ⁇ v ⁇ 5 antagonist inhibits binding of vitronectin or other RGD-containing ligands to ⁇ v ⁇ 5 but does not substantially inhibit binding of vitronectin to ⁇ v ⁇ 3 or ⁇ dress b ⁇ 3 .
- a preferred ⁇ v ⁇ 5 antagonist can be a fusion polypeptide, a linear or cyclic polypeptide, a derivatized polypeptide, a monoclonal antibody or a functional fragment thereof, or an organic molecule that is a mimetic of an ⁇ , ⁇ 5 ligand that is also referred to as an organic mimetic, all of which specifically interacts with ⁇ v ⁇ 5 .
- Administration of the ⁇ v ⁇ 5 antagonists of this invention includes intraocular, intravenous, transdermal, intrasynovial, intramuscular and oral administration. In other preferred embodiments, administration is coordinated with a chemotherapeutic regimen to control tumorigenesis and cancer metastasis.
- Figures 1A-1D illustrate inhibition of cytokine-induced rabbit corneal angiogenesis by ⁇ v integrin antibody antagonists. Induction of angiogenesis by treatment with either bFGF or
- VEGF and effects of treatment thereof with the ⁇ v integrin antibody antagonists, P1F6 ( ⁇ v ⁇ 5 )and LM609 ( ⁇ v ⁇ 3 ), are described in Example 4.
- OD and OS are respectively the right and left eyes of an experimental rabbit.
- Large arrows indicate corneal angiogenesis with edema while small arrows point to normal conjunctival limbal vessels.
- Figures IA and IB show induction of angiogenesis with bFGF while Figures IC and ID show that with VEGF.
- Rabbit corneas in Figures 1 A and IC show treatment with P1F6 while Figures IB and ID show treatment with LM609.
- FIGs 3A-3F photographically illustrate the effects of anti-integrin antibody treatment on the chick CAM preparation. The results are described in Example 6A.
- Angiogenesis is either induced with bFGF or VEGF followed by intravenous administration of phosphate buffered saline (PBS) as a control or with P1F6 or LM609 monoclonal antibodies described in the legend for Figure 1.
- CAMs treated with bFGF are shown in Figures 3A, 3C and 3E while CAMs treated with VEGF are shown in Figures 3B, 3D and 3F.
- Control CAMs receiving intravenous injections of PBS are shown in Figures 3A and 3B.
- the P1F6 antibody was used to treat CAMs shown in Figures 3C and 3D while the LM609 antibody was used to treat CAMs in Figures 3E and 3F.
- Figures 4A and 4B provide in histogram format the quantitation of results shown in Figures 3A-3F.
- the angiogenesis index is plotted on the Y-axis against control or antibody treatment.
- Figures 4A and 4B respectively show bFGF- and VEGF-induced angiogenesis. The results are discussed in Example 4.
- FIGs 5A-5F photographically illustrate the effects of synthetic peptide treatment on the chick CAM preparation as described in Example 6.
- Angiogenesis is either induced with bFGF or VEGF followed by intravenous administration of phosphate buffered saline (PBS) as a control or with the synthetic cyclic peptides RGDfV (SEQ ID NO 4) or RADfV (SEQ ID NO 5).
- CAMs treated with bFGF are shown in Figures 5A, 5C and 5E while CAMs treated with VEGF are shown in Figures 5B, 5D and 5F.
- Control CAMs receiving intravenous injections of PBS are shown in Figures 5A and 5B.
- the RDGfV peptide was used to treat CAMs shown in Figures 5C and 5D while the RADfV peptide was used to treat CAMs in Figures 5E and 5F.
- Figures 6A and 6B provide, in histogram format, the quantitation of results shown in Figures 5A-5F.
- the angiogenesis index is plotted on the Y-axis against control or antibody treatment.
- Figures 6A and 6B respectively show bFGF- and VEGF-induccd angiogenesis. The results are discussed in Example 6.
- Figures 7A-7E show the effects of anti-integrin monoclonal antibodies and calphostin C on CAM angiogenesis induced by the separate cytokines, bFGF, TNF- ⁇ , VEGF and TGF- ⁇ . PMA was also evaluated. The assays and results are described in Example 6. The results are plotted in histogram format where angiogenesis index is graphed on the Y-axis and the various control or inhibitors are shown on the X-axis. Figures 7A-7E respectively show angiogenesis induced with bFGF, TNF- ⁇ , VEGF, TGF- ⁇ and PMA.
- Figure 8 is a histogram showing the effects of antibody treatment on CS1 melanoma tumor growth in the chick embryo CAM assayed performed as described in Examples 5C and
- Figure 9 is a histogram of the effects of control versus an ⁇ v ⁇ 5 peptide antagonist, labeled peptide 189 (SEQ ID NO 9) on melanoma tumor growth as measured by tumor volume in mm 3 plotted on the Y-axis. The assay and results are described in Example 8.
- Figure 10 illustrates the synthesis of Compound 7 as described in Example 10A-G.
- Figure 1 1 illustrates the synthesis of Compound 9 as described in Example 10A-C; H-I.
- Figure 12 illustrates the synthesis of Compound 10 as described in Example 10J.
- Figure 13 illustrates the synthesis of Compound 12 and Compound 14 as respectively described in Example 10K-L and 10M-N.
- Figure 14 shows the chemical structures of Compound 15, Compound 16, Compound 17 and Compound 18. The detailed synthesis of said compounds are described in Example 10O-R.
- Figures 15A and 15B show the consecutive cDNA sequence of chicken MMP-2 along with the deduced amino acid sequence shown on the second line.
- the third and fourth lines respectively show the deduced amino acid sequence of human and mouse MMP-2 as described in Example 7.
- the chicken cDNA sequence is listed in SEQ ID NO 23 along with the encoded amino acid sequence that is also presented separately as SEQ ID NO 24.
- Figure 16 shows the amino acid residue sequence of mature human MMP-2 protein having 631 residues. Amino acid residue positions of human MMP-2-derived fragments correspond to those in the figure. The amino acid residue sequence is listed in SEQ ID NO 25.
- Figure 17 shows the effects of peptides 85189 and inert salt counte ⁇ art 121974 on
- VEGF -induced angiogenesis in the CAM model as further described in Example 6A.
- the effect is compared to untreated (labeled as NT) and control (labeled as 69601) peptide treated preparations.
- the effect on angiogenesis is measured by calculation of the number of branch points as further described in Example 6A.
- Figures 18, 19 and 20 respectively show the reduction in tumor weight for UCLAP-3,
- Example 6D M21-L and FgM tumors following intravenous exposure to control peptide 69601 and antagonist 85189 as further described in Example 6D.
- the data is plotted with tumor weight on the Y-axis against the peptide treatments on the X-axis.
- Figure 21 illustrates the effect of peptides and antibodies on melanoma tumor growth in the chimeric mouse:human model as further described in Example 8.
- Tumor volume in mm 3 is plotted on the Y-axis against the various treatments on the X-axis.
- Figures 22A and 22B respectively show the effect of antagonist 85189 (labeled 189) compared to control peptide 69601 (labeled 601) in reducing the volume and wet weight of M21L tumors over a dosage range of 10, 50 and 250 ⁇ g/injection as further described in Example 8.
- Figures 23 A and 23B show the effectiveness of antagonist peptide 85189 (labeled 189 with a solid line and filled circles) against control peptide 69601 (labeled 601 on a dotted line and open squares) at inhibiting M21L tumor volume in the mouse :human model with two different treatment regimens as further described in Example 8.
- Tumor volumes in mm 3 is plotted on the Y-axis against days on the X-axis.
- Amino Acid Residue An amino acid formed upon chemical digestion (hydrolysis) of a polypeptide at its peptide linkages.
- the amino acid residues described herein are preferably in the "L" isomeric form. However, residues in the "D" isomeric form can be substituted for any L-amino acid residue, as long as the desired functional property is retained by the polypeptide.
- NH 2 refers to the free amino group present at the amino terminus of a polypeptide.
- COOH refers to the free carboxy group present at the carboxy terminus of a polypeptide.
- amino acid residue sequences are represented herein by formulae whose left and right orientation is in the conventional direction of amino-terminus to carboxy-terminus. Furthermore, it should be noted that a dash at the beginning or end of an amino acid residue sequence indicates a peptide bond to a further sequence of one or more amino acid residues.
- Polypeptide A linear series of amino acid residues connected to one another by peptide bonds between the alpha-amino group and carboxy group of contiguous amino acid residues.
- Peptide A linear series of no more than about 50 amino acid residues connected one to the other as in a polypeptide.
- Cyclic peptide refers to a compound having a heteroatom ring structure that includes several amide bonds as in a typical peptide.
- the cyclic peptide can be a "head to tail" cyclized linear polypeptide in which a linear peptide's n-terminus has formed an amide bond with the - 5 terminal carboxylate of the linear peptide, or it can contain a ring structure in which the polymer is homodetic ore heterodetic and comprises amide bonds and/or other bonds to close the ring, such as disulfide bridges, thioesters, thioamides, guanidino, and the like linkages.
- Protein A linear series of greater than 50 amino acid residues connected one to the other as in a polypeptide.
- Fusion protein refers to a polypeptide containing at least two different polypeptide domains operatively linked by a typical peptide bond ("fused"), where the two domains correspond to peptides no found fused in nature.
- Synthetic peptide A chemically produced chain of amino acid residues linked together by peptide bonds that is free of naturally occurring proteins and fragments thereof. 15
- the present invention relates generally to the discovery that angiogenesis is mediated by the specific vitronectin receptor ⁇ v ⁇ 5 , and that inhibition of ⁇ v ⁇ 5 function inhibits angiogenesis. This discovery is important because of the role that angiogenesis plays in a
- angiogenesis will reduce the deleterious effects of the disease. Examples include rheumatoid arthritis, diabetic retinopathy, inflammatory diseases, 25 restenosis, and the like. Where the growth of new blood vessels is required to support growth of a deleterious tissue, inhibition of angiogenesis will reduce the blood supply to the tissue and thereby contribute to reduction in tissue mass based on blood supply requirements.
- Examples include growth of new blood vessels in response to ischemia, resulting in growth factor-induced angiogenesis, growth of tumors where neovascularization is a continual requirement in order that - 30 the tumor grow beyond a few millimeters in thickness, and for the establishment of solid tumor metastases.
- the methods of the present invention are effective in part because the therapy is highly selective for angiogenesis and not other biological processes. As shown in the Examples, only new vessel growth contains substantial ⁇ v ⁇ 5 , and therefore the therapeutic methods do not adversely effect mature vessels.
- RGD-containing peptides can be designed to be selective for inhibition of ⁇ v ⁇ 5 , as described further herein.
- the invention provides for a method of inhibiting angiogenesis in a tissue, and thereby inhibiting events in the tissue which depend upon angiogenesis.
- the method comprises administering to the tissue a composition comprising an angiogenesis-inhibiting amount of an ⁇ v ⁇ 5 antagonist.
- the target tissue used in practicing the methods of this invention is defined as ⁇ v ⁇ 5 - containing tissue that is characterized by the detectable presence of ⁇ v ⁇ 5 integrin receptor.
- an ⁇ v ⁇ ,-containing tissue is defined by the presence of the ⁇ v ⁇ 5 receptor complex in the cell membranes.
- Such tissues include epithelially and mesenchymally derived cells.
- the presence of the receptor can be determined by a number of means including immunoreactivity of the receptor with an anti- ⁇ v ⁇ 5 integrin receptor antibody, wherein the immunoreaction is detected in tissues by microscopy, by immunoprecipitation, by competition in ligand binding assays and the like techniques.
- Preferred antibodies for use in detecting the presence of ⁇ v ⁇ 5 in a tissue are described below and in Example 1.
- the distribution of ⁇ v ⁇ 5 in kidney, skin and ocular tissues by immunofluorescence microscopy is described in Example 2.
- an ⁇ v ⁇ 5 -containing tissue is also characterized as one that has an indicia of angiogenesis.
- angiogenesis includes a variety of processes involving neovascularization of a tissue including "sprouting", vascuiogenesis, or vessel enlargement, all of which angiogenesis processes are mediated by and dependent upon the expression of ⁇ v ⁇ 5 .
- tissue including "sprouting", vascuiogenesis, or vessel enlargement, all of which angiogenesis processes are mediated by and dependent upon the expression of ⁇ v ⁇ 5 .
- co ⁇ us luteum formation and embryogenesis it is believed that the majority of angiogenesis processes are associated with disease processes and therefore the use of the present therapeutic methods are selective for the disease and do not have deleterious side effects.
- angiogenic diseases including but not limited to, inflammatory disorders such as immune and non-immune inflammation, chronic articular rheumatism and psoriasis, disorders associated with inappropriate or inopportune invasion of vessels such as restenosis, capillary proliferation in atherosclerotic plaques and osteoporosis, and cancer associated disorders, such as solid
- tumors solid tumor metastases, angiofibromas, retrolental fibroplasia, hemangiomas, Kaposi sarcoma and the like cancers which require neovascularization to support tumor growth.
- Ocular neovascularization is the most common pathological change observed in the vast majority of eye diseases that result in catastrophic loss of vision. The growth of new blood
- 15 vessels from the preexisting choroidal, retinal or paralimbal vessels can lead to edema, hemorrhage or fibrovascular membrane formation resulting in disruption of the normal anatomic relationships of the eye and concomitant loss of normal visual function.
- Eye diseases characterized by angiogenesis include corneal neovascular disorders that include corneal transplantation, he ⁇ etic keratitis, luetic keratitis, pterygium, neovascular pannus
- Additional eye diseases also include diabetic retinopathy (DR), age-related macular degeneration (ARMD), presumed ocular histoplasmosis (POHS), retinopathy of prematurity (ROP) and neovascular glaucoma and the like. While inhibition of angiogenesis in these diseases would not necessarily cure the underlying disease, it would significantly reduce the visual morbidity associated with them.
- DR retinal disease characterized by leaking and/or proliferating blood vessels.
- ARDM 25% of the population over 65, approximately 630,000, will have some form of the disease with the expectation that by - 30 the year 2030, over 6.3 million individuals will have ARDM.
- having the ability to inhibit ⁇ v ⁇ 5 -associated angiogenesis with the therapeutic compositions and methods of this invention has great medicinal value.
- angiogenesis in a diseased tissue ameliorate symptoms of the disease and, depending upon the disease, can contribute to cure of the disease.
- the invention contemplates inhibition of angiogenesis, per se, in a tissue.
- the extent of angiogenesis in a tissue, and therefore the extent of inhibition achieved by the present methods, can be evaluated by a variety of methods, such as are described in the Examples for detecting ⁇ v ⁇ 5 -immunopositive nascent and immature vessel structures by immunohistochemistry.
- any of a variety of tissues, or organs comprised of organized tissues can support angiogenesis in disease conditions including skin, muscle, gut, connective tissue, joints, bones and the like tissue in which blood vessels can invade upon angiogenic stimuli.
- the methods and ⁇ v ⁇ 5 antagonist compositions of this invention are therapeutically useful for inhibiting angiogenesis that has been induced by growth factors, also referred to as cytokines.
- growth factors also referred to as cytokines.
- angiogenesis is highly regulated and as previously published by Brooks et al., Science. 264:569-5761 (1994), has been shown to be activated by specific angiogenic molecules such as basic fibroblast growth factor (bFGF).
- bFGF basic fibroblast growth factor
- Negative regulators of angiogenesis have also been described. Angiogenesis is thus regulated by an intricate balance between local stimulators and inhibitors. See, D'Amore, Investigative Ophthal. Visual Sci.. 35:3974-3979 (1994).
- capillary endothelial cells are induced to proliferate, migrate and ultimately differentiate to form new blood vessels.
- Angiogenesis is characterized as an event cascade having a set of early events followed by a set of late events as reviewed by Leibovich, "Role of Cytokines in the Process of Tumor Angiogenesis", in “Human Cytokines: Their Role in Disease and Therapy", eds. Aggarwal and Puri, Chapter 35, Blackwell Science, Inc. (1995).
- the early events are preceded by the delivery of angiogenic growth factors and cytokines delivered from an extravascular source.
- the early events then proceed in the target microvasculature with the disruption of intercellular junctions, induction of expression of endothelial cell activation antigens and a proteolytic phenotype, and initiation of endothelial cell migration in a directional manner.
- the late events are characterized with autocrine and paracrine expression of growth factor and cytokine genes within the cells, endothelial cells, pericytes and smooth muscle cells, of the developing capillary bud. These cells in turn modulate the interactions of the cells with the extracellular matrix resulting in the formation of new functional capillary loops from existing mature vessels.
- VEGF vascular endothelial growth factor
- EGF EGF
- TGF- ⁇ growth factor- ⁇ growth factor
- growth factors are proteins that are secreted by one cell that act on the secreting cell or another cell. Their ability to act is dependent on the presence of growth factor receptors that are usually transmembrane proteins.
- Growth factors such as VEGF are also referred to generally as cytokines that are defined as polypeptide hormones, secreted by a cell, that affect growth and metabolism either of the same (autocrine) or of another (paracrine) cell.
- cytokine is not limited to molecules produced by cells of the immune system and the biological response modifiers of the same system.
- cytokine is a broad category of which one subcategory based on the type of biological response is stimulatory growth factors or enhancers such as VEGF, bFGF, EGF, TGF- ⁇ , and the like.
- VEGF vascular endothelial growth factor
- bFGF vascular endothelial growth factor
- EGF vascular endothelial growth factor
- TGF- ⁇ vascular endothelial growth factor- ⁇
- ⁇ v ⁇ 5 -specific antagonists and not growth factor antagonists such as antibodies against VEGF, are contemplated for use in inhibiting angiogenesis in a tissue.
- the ⁇ v ⁇ 5 antagonists described herein are useful for inhibiting growth factor-induced angiogenesis in which the expression of the ⁇ v ⁇ 5 integrin receptor is induced.
- Preferred growth factors in this context include VEGF, EGF, TGF- ⁇ and the like.
- the growth factors EGF and VEGF are both known to bind to their cellular receptors that act as tyrosine kinases. Activation of the EGF receptor has further been shown to be correlated with activation of protein kinase C that results in activation of ⁇ v ⁇ 5 to allow for migration of specific cells on a vitronectin substrate.
- the mechanism of action between exposure to cytokines or growth factors and the coordinate response in integrin expression or activation is a complex biological process.
- the present invention contemplates the use of ⁇ v ⁇ 5 antagonists for inhibiting angiogenesis in any tissue in which angiogenesis has been induced by VEGF.
- ischemia of the retina in various animal model systems has been shown to result in the upregulation of VEGF that is secreted from Muller cells, the production of which consequently induces neovascularization of tissues within the eye. See, Miller et al., Am. J. Path.. 145:574-584 (1994) and Pierce et al., Proc. Natl. Acad. Sci.. USA. 92:905-909 (1995).
- a tissue to be treated is a retinal tissue of a patient with diabetic retinopathy, macular degeneration, neovascular glaucoma or the like diseases as discussed above and the angiogenesis to be inhibited is retinal tissue angiogenesis where there is neovascularization of retinal tissue.
- Exemplary tissues, including corneal tissues, from patients with ocular neovascularization conditions or diseases are described above and in the Examples.
- An exemplary model system for assessing the effects of an ⁇ v ⁇ 5 antagonist of this invention for treating retinal angiogenesis is the murine model of retinal neovascularization as described in Example 9.
- a tissue to be treated is an inflamed tissue and the angiogenesis to be inhibited is inflamed tissue angiogenesis where there is neovascularization of inflamed tissue.
- the method contemplates inhibition of angiogenesis in arthritic tissues, such as in a patient with chronic articular rheumatism, in immune or non-immune inflamed tissues, in psoriatic tissue and the like.
- cytokines interleukin 1 and tumor necrosis factor- ⁇
- cytokine-specific inhibitors as well as targeting cell adhesion molecules that are expressed in the condition. See, Haskard et al., Cell Adhesion Comm.. 2:235- 238 (1994).
- inhibition of angiogenesis in arthritic conditions by addressing and directing the therapy to the involvement of the ⁇ v ⁇ 5 adhesion molecule is another preferred embodiment of the invention as prior to this invention.
- a tissue to be treated is a tumor tissue of a patient with a solid tumor, a metastases, a skin cancer, a breast cancer, a hemangioma or angiofibroma and the like cancer, and the angiogenesis to be inhibited is tumor tissue angiogenesis where there is neovascularization of a tumor tissue.
- Typical solid tumor tissues treatable by the present methods include lung, pancreas, breast, colon, laryngeal, ovarian, and the like tissues.
- cytokine network The role of the complex cytokine network that exists in solid human tumors is the subject of a review by Leek et al., J. Leukocyte Biol.. 56:423-435 (1994), the disclosure of which is hereby inco ⁇ orated by reference.
- a number of cytokines including VEGF, acidic as well as basic FGF (bFGF), TGF- ⁇ and - ⁇ , EGF, TNF- ⁇ , platelet derived endothelial cell growth factor, angiogenin, interferons ⁇ and ⁇ , interleukins 1 , 6 and 8 and the like are thought to influence various cellular mechanisms of angiogenesis in malignant tissues and cell lines.
- VEGF has recently been shown to be linked to angiogenesis in breast carcinoma as described by Brown et al. Human Path.. 26:86-91 (1995).
- Tumors that secrete various cytokines and therein induce localized angiogenesis in response, specifically in the present invention with the cytokines VEGF, TGF- ⁇ and EGF and the resultant ⁇ v ⁇ 5 -mcdiated angiogenesis, are identifiable by screening tumor tissue samples with anti-cytokine antibodies. Such methods are familiar to one of ordinary skill in the art for either cultured or biopsied tumor tissue samples. Antibodies against the above-described cytokines are commercially available through Oncogene Sciences (Uniondale, NY) or Upstate Biotech Inco ⁇ orated (Lake Placid, NY). The screening of selected tumor tissues by these means thereby allows one to assess the potential of angiogenesis inhibitory activity by the ⁇ v ⁇ 5 antagonists of this invention.
- Inhibition of tumor tissue angiogenesis is still another preferred embodiment of the invention because of the important role neovascularization plays in tumor growth.
- the tumor tissue does not obtain the required nutrients, slows in growth, ceases additional growth, regresses and ultimately becomes necrotic resulting in killing of the tumor.
- the present invention provides for a method of inhibiting tumor neovascularization by inhibiting tumor angiogenesis according to the present methods. Similarly, the invention provides a method of inhibiting tumor growth by practicing the angiogenesis-inhibiting methods.
- the methods are also particularly effective against the formation of metastases because (1) their formation requires vascularization of a primary tumor so that the metastatic cancer cells can exit the primary tumor and (2) their establishment in a secondary site requires neovascularization to support growth of the metastases.
- the invention contemplates the practice of the method in conjunction with other therapies such as conventional chemotherapy directed against solid tumors and for control of establishment of metastases.
- the administration of angiogenesis inhibitor is typically conducted during or after chemotherapy, although it is preferable to inhibit angiogenesis after a regimen of chemotherapy at times where the tumor tissue will be responding to the toxic assault by inducing angiogenesis to recover by the provision of a blood supply and nutrients to the tumor tissue.
- angiogenesis inhibition methods after surgery where solid tumors have been removed as a prophylaxis against metastases.
- the methods can also apply to inhibition of tumor tissue growth, to inhibition of tumor metastases formation, and to regression of established tumors.
- the diminishment of a tumor mass is evaluated in the rabbit eye assay model as described for use in this invention or with a model system of a chimeric mouse:human model in which skin of a mouse having severe combined immunodeficiency (SCID) is replaced with human neonatal foreskin as described by Yan et al., J. Clin. Invest..
- SCID severe combined immunodeficiency
- Restenosis is a process of smooth muscle cell (SMC) migration and proliferation at the site ol percutaneous transluminal coronary angioplasty which hampers the success of angioplasty.
- SMC smooth muscle cell
- the migration and proliferation of SMC's during restenosis can be considered a process of angiogenesis which is inhibited by the present methods. Therefore, the invention also contemplates inhibition of restenosis by inhibiting angiogenesis according to the present methods in a patient following angioplasty procedures.
- the ⁇ v ⁇ 5 antagonist is typically administered after the angioplasty procedure for from about 2 to about 28 days, and more typically for about the first 14 days following the procedure.
- the patient treated in the present invention in its many embodiments is desirably a human patient, although it is to be understood that the principles of the invention indicate that the invention is effecth e with respect to all mammals, which are intended to be included in the term 'patient".
- a mammal is understood to include any mammalian species in which treatment of diseases, particularly agricultural and domestic mammalian species, is sought with respect to the methods of this invention.
- the present method for inhibiting angiogenesis in a tissue comprises contacting a tissue in which angiogenesis is occurring, or is at risk for occurring, with a composition comprising a therapeutically effective amount of an ⁇ v ⁇ s antagonist capable of inhibiting ⁇ v ⁇ , binding to its natural ligand.
- the method comprises administering to a patient a therapeutically effective amount of a physiologically tolerable composition containing an ⁇ v ⁇ 5 antagonist of the invention.
- the dosage ranges for the administration of the ⁇ . ⁇ , antagonist depend upon the form of the antagonist, and its potency, as described further herein, and are amounts large enough to produce the desired effect in which angiogenesis and the disease symptoms mediated by angiogenesis are ameliorated.
- the dosage should not be so large as to cause adverse side effects, such as hyperviscosity syndromes, pulmonary edema, congestive heart failure, and the like.
- the dosage will vary with the age, condition, sex and extent of the disease in the patient and can be determined by one of skill in the art.
- the dosage can also be adjusted by the individual physician in the event of any complication.
- An ⁇ v ⁇ , antagonist is a molecule that blocks or inhibits the physiologic or pharmacologic activity of ⁇ v ⁇ , by inliibiting the binding activity of the receptor to its ligand. namely vitronectin.
- Preferred ⁇ , ⁇ , antagonists can either be a monoclonal antibody, a peptide or an organic-based molecule that is a mimetic of an ⁇ v ⁇ 5 ligand.
- a therapeutically effective amount is an amount of ⁇ , ⁇ , antagonist sufficient to produce a measurable inhibition of angiogenesis in the tissue being treated, i.e., an angiogenesis- inhibiting amount.
- Inhibition of angiogenesis can be measured in situ by immunohistochemistry, as described herein, or by other methods known to one skilled in the art.
- an ⁇ v ⁇ , antagonist can take the form of an ⁇ s ⁇ s ligand organic mimetic, an RGD-containing peptide, an anti- ⁇ v ⁇ 5 monoclonal antibody, or fragment thereof, or an ⁇ v ⁇ 5 receptor mimetic it is to be appreciated that the potency, and therefore an expression of a "therapeutically effective" amount can vary.
- one skilled in the art can readily assess the potency of a candidate ⁇ , ⁇ s antagonist of this invention.
- Potency of an ⁇ v ⁇ 5 antagonist can be measured by a variety of means including inhibition of angiogenesis in the CAM assay, in the in vivo rabbit eye assay, and by measuring inhibition of binding of natural ligand to ⁇ v ⁇ ,, all as described herein, and the like assays.
- a preferred ⁇ v ⁇ , antagonist has the ability to substantially inhibit binding of a natural ligand such as vitronectin to ⁇ v ⁇ 5 in solution at antagonist concentrations of less than 0.5 micromolar ( ⁇ M), preferably less than 0.1 ⁇ M. and more preferably less than 0.05 ⁇ M.
- substantially is meant that at least a 50 percent reduction in binding of vitronectin is observed by inhibition in the presence of the ⁇ v ⁇ 5 antagonist, and at 50% inhibition is referred to herein as an IC, 0 value.
- a more preferred ⁇ v ⁇ s antagonist exhibits selectivity for ⁇ , ⁇ s over other integrins.
- a preferred ⁇ v ⁇ 5 antagonist substantially inhibits vitronectin binding to ⁇ v ⁇ 5 but does not substantially inhibit binding of vitronectin to another integrin, such as ⁇ v ⁇ ,, ⁇ v ⁇ 3 or ⁇ leader b ⁇ 3 .
- Particularly preferred is an ⁇ v ⁇ 5 antagonist that exhibits a 10-fold to 100-fold lower IC 50 activity at inhibiting vitronectin binding to ⁇ v ⁇ ⁇ compared to the IC 50 activity at inhibiting vitronectin binding to another integrin. Exemplary assays for measuring IC 50 activity at inhibiting vitronectin binding to an integrin are described in the Examples.
- a therapeutically effective amount of an ⁇ v ⁇ 5 antagonist of this invention in the form of a monoclonal antibody is typically an amount such that when administered in a physiologically tolerable composition is sufficient to achieve a plasma concentration of from about 0.01 microgram ( ⁇ g) per milliliter (ml) to about 100 ⁇ g/ml, preferably from about 1 ⁇ g/ml to about 5 ⁇ g/ml. and usually about 5 ⁇ g/ml.
- the dosage can vary from about 0.1 mg/kg to about 300 mg/kg, preferably from about 0.2 mg/kg to about 200 mg/kg, most preferably from about 0.5 mg/kg to about 20 mg/kg, in one or more dose administrations daily, for one or several days.
- the amount can readily be adjusted based on the mass of the fragment relative to the mass of the whole antibody.
- a preferred plasma concentration in molarity is from about 2 micromolar ( ⁇ M) to about 5 millimolar (mM) and preferably about 100 ⁇ M to 1 mM antibody antagonist.
- a therapeutically effective amount of an ⁇ v ⁇ s antagonist of this invention in the form of a polypeptide, or other similarly-sized small molecule ⁇ v ⁇ 5 ligand mimetic is typically an amount of polypeptide such that when administered in a physiologically tolerable composition is sufficient to achieve a plasma concentrauon of from about 0.1 microgram ( ⁇ g) per milliliter (ml) to about 200 ⁇ g/ml, preferably from about 1 ⁇ g/ml to about 150 ⁇ g/ml.
- the preferred plasma concentration in molarity is from about 2 micromolar ( ⁇ M) to about 5 millimolar (mM) and preferably about 100 ⁇ M to 1 mM polypeptide antagonist.
- the dosage per body weight can vary from about 0.1 mg/kg to about 300 mg/kg, and preferably from about 0.2 mg/kg to about 200 mg/kg, in one or more dose administrations daily, for one or several days.
- the monoclonal antibodies, polypeptides or organic mimetics of this invention can be administered parenterally by injection or by gradual infusion over time.
- tissue to be treated can typically be accessed in the body by systemic administration and therefore most often treated by intravenous administration of therapeutic compositions, other tissues and delivery means are contemplated where there is a likelihood that the tissue targeted contains the target molecule.
- monoclonal antibodies, polypeptides or organic mimetics of this inven- tion can be administered intraocularly, intravenously, intraperitoneally, intramuscularly, subcutaneously, intracavity, transdermally, and can also be delivered by peristaltic means.
- the therapeutic compositions containing an ⁇ v ⁇ 5 antagonist of this invention are conventionally administered intravenously, as by injection of a unit dose, for example.
- unit dose when used in reference to a therapeutic composition of the present invention refers to physically discrete units suitable as unitary dosage for the subject, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required diluent, i.e., carrier, or vehicle.
- the ⁇ , ⁇ 5 antagonist is administered in a single dosage intravenously.
- compositions are administered in a manner compatible with the dosage formulation and in a therapeutically effective amount.
- quantity to be administered and timing of administration depends on the subject to be treated, capacity of the subject's system to utilize the active ingredient, and degree of therapeutic effect desired. Precise amounts of active ingredient required to be administered depend on the judgement of the practitioner and are peculiar to each individual.
- suitable dosage ranges for systemic application are disclosed herein and depend on the route of administration. Suitable regimens for administration are also variable but are typified by an initial administration followed by repeated doses at one or more hour intervals by a subsequent injection or other administration. Alternatively, continuous intravenous infusion sufficient to maintain concentrations in the blood in the ranges specified for in vivo therapies are contemplated.
- compositions of the present invention contemplates therapeutic compositions useful for practicing the therapeutic methods described herein.
- Therapeutic compositions of the present invention contain a physiologically tolerable carrier together with an ⁇ v ⁇ ; antagonist as described herein, dissolved or dispersed therein as an active ingredient.
- the therapeutic ⁇ v ⁇ 5 antagonist composition is not immunogenic when administered to a mammal or human patient for therapeutic purposes.
- compositions, carriers, diluents and reagents are used interchangeably and represent that the materials are capable of administration to or upon a mammal without the production of undesirable physiological effects such as nausea, dizziness, gastric upset and the like.
- physiological effects such as nausea, dizziness, gastric upset and the like.
- the preparation of a pharmacological composition that contains active ingredients dissolved or dispersed therein is well understood in the art and need not be limited based on formulation.
- Such compositions are prepared as injectables either as liquid solutions or suspensions, however, solid forms suitable for solution, or suspensions, in liquid prior to use can also be prepared.
- the preparation can also be emulsified.
- the active ingredient can be mixed with excipients which are pharmaceutically acceptable and compatible with the active ingredient and in amounts suitable for use in the therapeutic methods described herein.
- Suitable excipients are, for example, water, saline, dextrose, glycerol, ethanol or the like and combinations thereof.
- the composition can contain minor amounts of auxiliary substances such as wetting or emulsifying agents, pH buffering agents and the like which enhance the effectiveness of the active ingredient.
- the therapeutic composition of the present invention can include pharmaceutically acceptable salts of the components therein.
- Pharmaceutically acceptable salts include the acid addition salts (formed with the free amino groups of the polypeptide) that are formed with inorganic acids such as. for example, hydrochloric or phosphoric acids, or such organic acids as acetic, tartaric, mandelic and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium or ferric hydroxides, and such organic bases as isopropylamine, trimcthylamine, 2-ethylamino ethanol, histidine, procaine and the like. Particularly preferred is the HC1 salt when used in the preparation of cyclic polypeptide ⁇ v ⁇ 5 antagonists.
- Physiologically tolerable carriers are well known in the art.
- Exemplary of liquid carriers are sterile aqueous solutions that contain no materials in addition to the active ingredients and water, or contain a buffer such as sodium phosphate at physiological pH value, physiological saline or both, such as phosphate-buffered saline.
- aqueous carriers can contain more than one buffer salt, as well as salts such as sodium and potassium chlorides, dextrose, polyethylene glycol and other solutes.
- Liquid compositions can also contain liquid phases in addition to and to the exclusion of water.
- additional liquid phases are glycerin, vegetable oils such as cottonseed oil, and water-oil emulsions.
- a therapeutic composition contains an angiogenesis-inhibiting amount of an ⁇ v ⁇ 5 antagonist of the present invention, typically formulated to contain an amount of at least 0.1 weight percent of antagonist per weight of total therapeutic composition.
- a weight percent is a ratio by weight of inhibitor to total composition.
- 0.1 weight percent is 0.1 grams of inhibitor per 100 grams of total composition.
- E. Antagonists of Integrin ⁇ .. ⁇ ; ⁇ v ⁇ 5 antagonists are used in the present methods for inhibiting angiogenesis in tissues, and can take a variety of forms that include compounds which interact with ⁇ v ⁇ 5 in a manner such that functional interactions with the natural ⁇ v ⁇ 5 ligands are interfered.
- Exemplary antagonists include analogs or mimetics of ⁇ v ⁇ 5 derived from the ligand binding site on ⁇ v ⁇ 5 , mimetics of a natural ligand of ⁇ v ⁇ 5 that mimic the structural region involved in ⁇ v ⁇ 5 -ligand binding interactions, polypeptides having a sequence corresponding to a functional binding domain of the natural ligand specific for ⁇ v ⁇ 5 , particularly corresponding to the RGD-containing domain of a natural ligand of ⁇ v ⁇ 5 , and antibodies which immunorcact with either ⁇ v ⁇ 5 or the natural ligand, all of which exhibit antagonist activity as defined herein.
- polypeptides contemplates ⁇ v ⁇ s antagonists in the form of polypeptides.
- a polypeptide (peptide) ⁇ % ⁇ , antagonist can have the sequence characteristics of either the natural ligand of ⁇ v ⁇ ⁇ or ⁇ , ⁇ 5 itself at the region involved in ⁇ v ⁇ s - ligand interaction and exhibits ⁇ v ⁇ 5 antagonist activity as described herein.
- a preferred ⁇ v ⁇ 5 antagonist peptide contains the RGD tripeptide and corresponds in sequence to the natural ligand in the RGD-containing region.
- Preferred RGD-containing polypeptides have a sequence corresponding to the amino acid residue sequence of the RGD-containing region of a natural ligand of ⁇ v ⁇ , such as vitronectin, for which the sequence is well known.
- a particularly preferred ⁇ v ⁇ 5 antagonist peptide preferentially inhibits ⁇ v ⁇ s binding to its natural ligand(s) when compared to other integrins. as described earlier.
- These ⁇ v ⁇ 5 -specific peptides are particularly preferred at least because the specificity for ⁇ v ⁇ , reduces the incidence of undesirable side effects such as inhibition of other integrins.
- the identification of preferred ⁇ v ⁇ 5 antagonist peptides having selectivity for ⁇ , ⁇ 5 can readily be identified in a typical inhibition of binding assay, such as the ELISA assay described in the Examples.
- a polypeptide of the present invention typically comprises no more than about 100 amino acid residues, preferably no more than about 60 residues, more preferably no more than about 30 residues.
- Peptides can be linear or cyclic, although particularly preferred peptides are cyclic. Preferred peptides are described in the Examples.
- polypeptide is greater than about 100 residues, it is typically provided in the form of a fusion protein or protein fragment, as described herein.
- a subject polypeptide need not be identical to the amino acid residue sequence of a ⁇ v ⁇ 5 natural ligand, so long as it includes a sequence necessary for antagonizing the binding of an ⁇ v ⁇ 5 ligand to ⁇ v ⁇ s and is able to function as an ⁇ v ⁇ 5 antagonist in an assay such as those described herein.
- a subject polypeptide includes any analog, fragment or chemical derivative of a polypeptide whose amino acid residue sequence is shown herein so long as the polypeptide is an ⁇ , ⁇ , antagonist. Therefore, a present polypeptide can be subject to various changes, substitutions, insertions, and deletions where such changes provide for certain advantages in its use.
- an ⁇ v ⁇ 5 antagonist polypeptide of this invention corresponds to, rather than is identical to, the sequence of a recited peptide where one or more changes are made and it retains the ability to function as an ⁇ v ⁇ , antagonist in one or more of the assays as defined herein.
- a polypeptide can be in any of a variety of forms of peptide derivatives, that includes amides, conjugates with proteins, cyclic peptides, polymerized peptides. analogs, fragments, chemically modified peptides, and the like derivatives.
- analog includes any polypeptide having an amino acid residue sequence substantially identical to a sequence specifically shown herein in which one or more residues have been conservatively substituted with a functionally similar residue and which displays the ⁇ v ⁇ 5 antagonist activity as described herein.
- conservative substitutions include the substitution of one non-polar (hydrophobic) residue such as isoleucine, valine, leucine or methioninc for another, the substitution of one polar (hydrophilic) residue for another such as between arginine and lysine, between glutamine and asparagine.
- substitution also includes the use of a chemically derivatized residue in place of a non-derivatized residue provided that such polypeptide displays the requisite inhibition activity.
- a “chemical derivative” refers to a subject polypeptide having one or more residues chemically derivatized by reaction of a functional side group.
- a chemical derivative can have one or more backbone modifications including ⁇ - amino substitutions such as N-methyl, N-ethyl, N-propyl and the like, and ⁇ -carbonyl substitutions such as thioester, thioamide, guanidino and the like.
- Such derivatized molecules include for example, those molecules in which free amino groups have been derivatized to form amine hydrochlorides, p-toluene sulfonyl groups, carbobenzoxy groups, t-butyloxycarbonyl groups, chloroacetyl groups or formyl groups.
- Free carboxyl groups may be derivatized to form salts, methyl and ethyl esters or other types of esters or hydrazides.
- Free hydroxyl groups may be derivatized to form O-acyl or O-alkyl derivatives.
- the imidazole nitrogen of histidine may be derivatized to form N-im-benzylhistidine.
- polypeptides of the present invention also include any polypeptide having one or more additions and/or deletions or residues relative to the sequence of a polypeptide whose sequence is shown herein, so long as the requisite activity is maintained.
- a particularly preferred derivative is a cyclic peptide according to the formula cyclo(Arg-Gly-Asp-D-Phe-NMeVal), abbreviated c(RGDf-NMeV), in which there is an N- methyl substituted ⁇ -amino group on the valine residue of the peptide and cyclization has joined the primary amino and carboxy termini of the peptide.
- fragment refers to any subject polypeptide having an amino acid residue sequence shorter than that of a polypeptide whose amino acid residue sequence is shown herein.
- a polypeptide of the present invention has a sequence that is not identical to the sequence of an ⁇ v ⁇ s natural ligand, it is typically because one or more conservative or non- conservative substitutions have been made, usually no more than about 30 number percent, and preferably no more than 10 number percent of the amino acid residues are substituted. Additional residues may also be added at either terminus of a polypeptide for the pu ⁇ ose of providing a "linker" by which the polypeptides of this invention can be conveniently affixed to a label or solid matrix, or carrier. Labels, solid matrices and carriers that can be used with the polypeptides of this invention are described hereinbelow.
- Amino acid residue linkers are usually at least one residue and can be 40 or more residues, more often 1 to 10 residues, but do not form ⁇ v ⁇ 5 ligand epitopes.
- Typical amino acid residues used for linking are tyrosine, cysteine, lysine, glutamic and aspartic acid, or the like.
- a subject polypeptide can differ, unless otherwise specified, from the natural sequence of an ⁇ v ⁇ 5 ligand by the sequence being modified by terminal-NH 2 acylation, e.g., acetylation, or thioglycolic acid amidation, by terminal-carboxylamidation, e.g., with ammonia, methylamine, and the like terminal modifications.
- Terminal modifications are useful, as is well known, to reduce susceptibility by proteinase digestion, and therefore serve to prolong half life of the polypeptides in solutions, particularly biological fluids where proteases may be present.
- polypeptide cyclization is also a useful terminal modification, and is particularly preferred also because of the stable structures formed by cyclization and in view of the biological activities observed for such cyclic peptides as described herein.
- Any peptide of the present invention may be used in the form of a pharmaceutically acceptable salt.
- Suitable acids which are capable of forming salts with the peptides of the present invention include inorganic acids such as trifluoroacctic acid (TFA) hydrochloric acid (HC1), hydrobromic acid, perchloric acid, nitric acid, thiocyanic acid, sulfuric acid, methane sulfonic acid, acetic acid, phosphoric acetic acid, propionic acid, glycolic acid, lactic acid, pyruvic acid, oxalic acid, malonic acid, succinic acid, maleic acid, fumaric acid, anthranilic acid, cinnamic acid, naphthalene sulfonic acid, sulfanilic acid or the like.
- HC1 salt is particularly preferred.
- Suitable bases capable of forming salts with the peptides of the present invention include inorganic bases such as sodium hydroxide, ammonium hydroxide, potassium hydroxide and the like; and organic bases such as mono-, di- and tri-alkyl and aryl amines (e.g. triethylamine, diisopropyl amine, methyl amine. dimethyl amine and the like) and optionally substituted ethanolamines (e.g. ethanolamine, diethanolamine and the like).
- inorganic bases such as sodium hydroxide, ammonium hydroxide, potassium hydroxide and the like
- organic bases such as mono-, di- and tri-alkyl and aryl amines (e.g. triethylamine, diisopropyl amine, methyl amine. dimethyl amine and the like) and optionally substituted ethanolamines (e.g. ethanolamine, diethanolamine and the like).
- a peptide of this invention can be prepared as described in the Examples without including a free ionic salt in which the charged acid or base groups present in the amino acid residue side groups (e.g., Arg, Asp, and the like) associate and neutralize each other to form an "inner salt” compound.
- the charged acid or base groups present in the amino acid residue side groups e.g., Arg, Asp, and the like
- a peptide of the present invention also referred to herein as a subject polypeptide, can be synthesized by any of the techniques that are known to those skilled in the polypeptide art, including recombinant DNA techniques. Synthetic chemistry techniques, such as a solid-phase Merri field-type synthesis, are preferred for reasons of purity, antigenic specificity, freedom from undesired side products, ease of production and the like. An excellent summary of the many techniques available can be found in Steward et al., "Solid Phase Peptide Synthesis", W.H. Freeman Co., San Francisco, 1969; Bodanszky, et al., "Peptide Synthesis", John Wiley & Sons, Second Edition, 1976: J.
- the solid-phase synthesis methods contemplated comprise the sequential addition of one or more amino acid residues or suitably protected amino acid residues to a growing peptide chain.
- a suitable, selectively removable protecting group is utilized for amino acids containing a reactive side group such as lysine.
- the protected or derivatized amino acid is attached to an inert solid support through its unprotected carboxyl or amino group.
- the protecting group of the amino or carboxyl group is then selectively removed and the next amino acid in the sequence having the complimentary (amino or carboxyl) group suitably protected is admixed and reacted under conditions suitable for forming the amide linkage with the residue already attached to the solid support.
- the protecting group of the amino or carboxyl group is then removed from this newly added amino acid residue, and the next amino acid (suitably protected) is then added, and so forth. After all the desired amino acids have been linked in the proper sequence, any remaining terminal and side group protecting groups (and solid support) are removed sequentially or concurrently to generate the final linear polypeptide.
- the resultant linear polypeptides prepared, for example, as described above may be reacted to form their corresponding cyclic peptides.
- An exemplary method for preparing a cyclic peptide is described by Zimmer et al., Peptides 1992. pp. 393-394, ESCOM Science Publishers. B.V.. 1993.
- tertbutoxycarbonyl protected peptide methyl ester is dissolved in methanol and sodium hydroxide solution are added and the admixture is reacted at 20°C (20C) to hydrolytically remove the methyl ester protecting group. After evaporating the solvent, the tertbutoxycarbonyl protected peptide is extracted with ethyl acetate from acidified aqueous solvent.
- the tertbutoxycarbonyl protecting group is then removed under mildly acidic conditions in dioxane cosolvent.
- the unprotected linear peptide with free amino and carboxy termini so obtained is converted to its corresponding cyclic peptide by reacting a dilute solution of the linear peptide, in a mixture of dichloromethane and dimethylformamide, with dicyclohexylcarbodiimide in the presence of 1 -hydroxybenzotriazole and N-methylmorpholine.
- the resultant cyclic peptide is then purified by chromatography.
- the ⁇ v ⁇ , antagonist can be provided in the form of a fusion protein.
- Fusion proteins are proteins produced by recombinant DNA methods as described herein in which the subject polypeptide is expressed as a fusion with a second carrier protein such as a glutathione sulfhydryl transferase (GST ) or other wil known carrier.
- GST glutathione sulfhydryl transferase
- Preferred fusion proteins comprise an MMP-2 polypeptide described herein, fhe preparation of a MMP-2 fusion protein is described in the Examples.
- peptides or derivative peptides for use in the present methods in tissues primarily exhibiting ⁇ v ⁇ , -associated angiogenesis are described in the Examples, and include the polypeptides shown in SEQ ID NOs 4, 6, 7. 8 and 9.
- polypeptides derived from MMP-2 described herein having sequences shown in SEQ ID Nos 1 1 -22.
- the present invention describes, in one embodiment, ⁇ v ⁇ ⁇ antagonists in the form of monoclonal antibodies which immunoreact with ⁇ N ⁇ s and inhibit ⁇ v ⁇ , binding to its natural ligand as described herein.
- the invention also describes cell lines which produce the antibodies, methods for producing the cell lines, and methods for producing the monoclonal antibodies.
- a monoclonal antibody of this invention comprises antibody molecules that 1 ) immunoreact with isolated ⁇ v ⁇ ,, and 2) inhibit vitronectin binding to ⁇ v ⁇ s .
- Preferred monoclonal antibodies which preferentially bind to ⁇ v ⁇ include a monoclonal antibody having the immunoreaction characteristics of mAb PI F6 and mAb P5H9, which are described in the Examples.
- antibody or antibody molecule in the various grammatical forms is used herein as a collective noun that refers to a population of immunoglobulin molecules and/or immunoiogically active portions of immunoglobulin molecules, i.e., molecules that contain an antibcdy combining site or paratope.
- an "antibody combining site” is that structural portion of an antibody molecule comprised of heavy and light chain variable and hypervariable regions that specifically binds antigen.
- Exemplary antibodies for use in the present invention are intact immunoglobulin molecules, substantially intact immunoglobulin molecules and those portions of an immunoglobulin molecule that contain the paratope, including those portions known in the art as Fab, Fab', F(ab') 2 and F(v), and also referred to as antibody fragments.
- the invention contemplates a truncated immunoglobulin molecule comprising a Fab fragment derived from a monoclonal antibody of this invention.
- the Fab fragment lacking Fc receptor, is soluble, and affords therapeutic advantages in serum half life, and diagnostic advantages in modes of using the soluble Fab fragment.
- the preparation of a soluble Fab fragment is generally known in the immunological arts and can be accomplished by a variety of methods. For example, Fab and F(ab') 2 portions (fragments) of antibodies are prepared by the proteolytic reaction of papain and pepsin, respectively, on substantially intact antibodies by methods that are well known. See for example, U.S. Patent No. 4,342,566 to Theofilopolous and Dixon.
- Fab' antibody portions are also well known and are produced from F(ab') 2 portions followed by reduction of the disulfide bonds linking the two heavy chain portions as with mercaptoethanol, and followed by alkylation of the resulting protein mercaptan with a reagent such as iodoacetamide.
- An antibody containing intact immunoglobulin molecules are preferred and are utilized as illustrative herein.
- the phrase "monoclonal antibody” in its various grammatical forms refers to a population of antibody molecules that contain only one species of antibody combining site capable of immunoreacting with a particular epitope.
- a monoclonal antibody thus typically displays a single binding affinity for any epitope with which it immunoreacts.
- a monoclonal antibody may therefore contain an antibody molecule having a plurality of antibody combining sites, each immunospecific for a different epitope, e.g., a bispecific monoclonal antibody.
- a monoclonal antibody is typically composed of antibodies produced by clones of a single cell called a hybridoma that secretes (produces) only one kind of antibody molecule.
- the hybridoma cell is formed by fusing an antibody-producing cell and a myeloma or other self- perpetuating cell line.
- the preparation of such antibodies was first described by Kohler and Milstein, Nature, 256:495-497 (1975), the description of which is inco ⁇ orated by reference. Additional methods are described by Zola, Monoclonal Antibodies: A Manual of Techniques. CRC Press, Inc. (1987).
- the hybridoma supernates so prepared can then be screened for the presence of antibody molecules that immunoreact with ⁇ v ⁇ 5 and for inhibition of ⁇ v ⁇ 5 binding to natural ligands.
- a myeloma or other self-perpetuating cell line is fused with lymphocytes obtained from the spleen of a mammal hyperimmunized with a source of ⁇ v ⁇ 5 .
- the myeloma cell line used to prepare a hybridoma be from the same species as the lymphocytes.
- a mouse of the strain 129 G1X + is the preferred mammal.
- Suitable mouse myelomas for use in the present invention include the hypoxanthine- aminopterin-thymidine-sensitive (HAT) cell lines P3X63-Ag8.653, and Sp2/0-Agl4 that are available from the American Type Culture Collection, Rockville, MD, under the designations CRL 1580 and CRL 1581, respectively.
- HAT hypoxanthine- aminopterin-thymidine-sensitive
- Splenocytes are typically fused with myeloma cells using polyethylene glycol (PEG) 1500. Fused hybrids are selected by their sensitivity to HAT. Hybridomas producing a monoclonal antibody of this invention are identified using the enzyme linked immunosorbent assay (ELISA), a variation of which is described in the Examples.
- ELISA enzyme linked immunosorbent assay
- a monoclonal antibody of the present invention can also be produced by initiating a monoclonal hybridoma culture comprising a nutrient medium containing a hybridoma that secretes antibody molecules of the appropriate specificity.
- the culture is maintained under conditions and for a time period sufficient for the hybridoma to secrete the antibody molecules into the medium.
- the antibody-containing medium is then collected.
- the antibody molecules can then be further isolated by well known techniques.
- DMEM Dulbecco's minimal essential medium
- hybridoma cell and cultures containing a hybridoma cell that produce a monoclonal antibody of this invention.
- a hybridoma cell line that secretes monoclonal antibody mAb P1 F6 and mAb P5H9, the preparation of which is described in the Examples.
- the invention contemplates, in one embodiment, a monoclonal antibody that has the immunoreaction characteristics of mAb PI F6 or mAb P5H9.
- a monoclonal antibody has the same (i.e., equivalent) specificity (immunoreaction characteristics) as a monoclonal anti- body of this invention by ascertaining whether the former prevents the latter from binding to a preselected target molecule. If the monoclonal antibody being tested competes with the monoclonal antibody of the invention, as shown by a decrease in binding by the monoclonal antibody of the invention in standard competition assays for binding to the target molecule when present in the solid phase, then it is likely that the two monoclonal antibodies bind to the same. or a closely related, epitope.
- Still another way to determine whether a monoclonal antibody has the specificity of a monoclonal antibody of the invention is to pre-incubate the monoclonal antibody of the invention with the target molecule with which it is normally reactive, and then add the monoclonal antibody being tested to determine if the monoclonal antibody being tested is inhibited in its ability to bind the target molecule. If the monoclonal antibody being tested is inhibited then, in all likelihood, it has the same, or functionally equivalent, epitopic specificity as the monoclonal antibody of the invention.
- An additional way to determine whether a monoclonal antibody has the specificity of a monoclonal antibody of the invention is to determine the amino acid residue sequence of the
- the immunospecificity of an antibody, its target molecule binding capacity and the attendant affinity the antibody exhibits for the epitope are defined by the epitope with which the antibody immunoreacts.
- the epitope specificity is defined at least in part by the amino acid residue sequence of the variable region of the heavy chain of the immunoglobulin the antibody and in part by the light chain variable region amino acid residue sequence.
- Humanized monoclonal antibodies offer particular advantages over murine monoclonal antibodies, particularly insofar as they can be used therapeutically in humans. Specifically, human antibodies are not cleared from the circulation as rapidly as “foreign” antigens. In addition, human antibodies do not activate the immune system in the same manner as foreign antigens and foreign antibodies. Methods of preparing "humanized” antibodies are generally well known in the art and can readily be applied to the antibodies of the present invention.
- the invention contemplates, in one embodiment, a monoclonal antibody of this invention that is humanized by grafting to introduce components of the human immune system without substantially interfering with the ability of the antibody to bind antigen.
- ⁇ ⁇ ⁇ , antagonists generally can be used in the present invention, the antagonists of which can include polypeptides, antibodies and other molecules, designated “mimetics", that have the capacity to interfere with ⁇ v ⁇ 5 function.
- Particularly preferred arc antagonists which specifically interfere with ⁇ v ⁇ 5 function, and do not interfere with function of other integrins.
- reagents may be suitable for use in the present methods, so long as these reagents possess the requisite biological activity.
- These reagents are generically referred to a mimetics because they possess the ability to "mimic" an ⁇ v ⁇ 5 ligand involved in the functional interaction of the receptor and ligand by blocking the ligand binding domain in the receptor, and thereby interfere with (i.e., inhibit) normal function.
- an ⁇ v ⁇ , antagonist may be a mimetic of the receptor rather than its ligand.
- a mimetic is any molecule, other than an antibody or ligand-derived peptide, which exhibits the above-described properties. It can be a synthetic peptide, an analog or derivative of a peptide, a compound which is shaped like the binding pocket of the above-described binding domain such as an organic mimetic molecule, or other molecule.
- a preferred mimetic of this invention is an organic-based molecule and thus is referred to as organic mimetic.
- Particularly preferred organic mimetic molecules that function as ⁇ v ⁇ 5 antagonists by being a mimetic to a ligand of ⁇ v ⁇ 5 are Compounds 7, 9, 10, 12, 14, 15, 16, 17 and 18 as described in Example 10.
- the design of an ⁇ v ⁇ , mimetic can be conducted by any of a variety of structural analysis methods for drug-design known in the art, including molecular modeling, two-dimensional nuclear magnetic resonance (2-D NMR) analysis, x-ray crystallography, random screening of peptide, peptide analog or other chemical polymer or compound libraries, and the like drug design methodologies.
- structural analysis methods for drug-design including molecular modeling, two-dimensional nuclear magnetic resonance (2-D NMR) analysis, x-ray crystallography, random screening of peptide, peptide analog or other chemical polymer or compound libraries, and the like drug design methodologies.
- an ⁇ v ⁇ 5 antagonist can be a fusion polypeptide (e.g.. an MMP-2 fusion protein), a small polypeptide, a cyclic peptide, a derivative peptide, an organic mimetic molecule, or a monoclonal antibody, that are diversely different chemical structures which share the functional property of selective inhibition of ⁇ v ⁇ 5
- the structure of a subject ⁇ v ⁇ 5 antagonist useful in the present methods need not be so limited, but includes any ⁇ v ⁇ , mimetic, as defined herein.
- the invention also describes assay methods for identifying candidate ⁇ v ⁇ 5 antagonists for use according to the present methods.
- candidate molecules are evaluated for their potency in inhibiting ⁇ v ⁇ 5 binding to natural ligands, and furthermore are evaluated for their potency in inhibiting angiogenesis in a tissue.
- the first assay measures angiogenesis in the chick chorioallantoic membrane (CAM) and is referred to as the CAM assay.
- the CAM assay has been described in detail by others, and further has been used to measure both angiogenesis and neovascularization of tumor tissues. See Ausprunk et al., Am. J. Pathol.. 79:597-618 (1975) and Ossonski et al., Cancer Res.. 40:2300- 2309 (1980).
- the CAM assay is a well recognized assay model for in vivo angiogenesis because neovascularization of whole tissue is occurring. Actual chick embryo blood vessels are growing into the CAM or into the tissue grown on the CAM. As demonstrated herein, the CAM assay illustrates inhibition of neovascularization based on both the amount and extent of new vessel growth. Furthermore, it is easy to monitor the growth of any tissue transplanted upon the CAM, such as a tumor tissue. Finally, the assay is particularly useful because there is an internal control for toxicity in the assay system. The chick embryo is exposed to any test reagent. As such, the health of the embryo is an indication of toxicity.
- the second assay that measures angiogenesis is the in vivo rabbit eye model and is referred to as the rabbit eye assay.
- the rabbit eye assay has been described in detail by others and further has been used to measure both angiogenesis and neovascularization in the presence of angiogenic inhibitors such as thalidomide. See D'Amato, et al., Proc. Natl. Acad. Sci.. USA. 91 :4082-4085 (1994).
- the rabbit eye assay is a well recognized assay model for in vivo angiogenesis because the neovascularization process, exemplified by rabbit blood vessels growing from the rim of the cornea into the cornea, is easily visualized through the naturally transparent cornea of the eye. Additionally, both the extent and the amount of stimulation or inhibition of neovascularization or regression of neovascularization can easily be monitored over time.
- the rabbit is exposed to any test reagent and as such the health of the rabbit is an indication of toxicity of the test reagent.
- the third assay measures inhibition of direct binding of the natural ligand, vitronectin, to ⁇ v ⁇ 5 , and a preferred embodiment is described in detail in the Examples.
- the assay typically measures the degree of inhibition of binding of a natural ligand, such as vitronectin, to isolated ⁇ v ⁇ 5 in the solid phase by ELISA, the inhibition of which is mediated by an ⁇ v ⁇ ;-specif ⁇ c inhibition.
- the assay can also be used to identify compounds which exhibit specificity for ⁇ v ⁇ , and do not inhibit natural ligands from binding other integrins.
- the specificity assay is conducted by running parallel ELISA assays where both ⁇ v ⁇ 5 and other integrins are screened concurrently in separate assay chambers for their respective abilities to bind a natural ligand and for the candidate compound to inhibit the respective abilities of the integrins to bind a preselected ligand.
- Preferred screening assay formats are described in the Examples.
- the invention also contemplates an article of manufacture which is a labelled container for providing an ⁇ v ⁇ , antagonist of the invention.
- An article of manufacture comprises packaging material and a pharmaceutical agent contained within the packaging material.
- the pharmaceutical agent in an article of manufacture is any of the ⁇ v ⁇ 5 antagonists of the present invention, formulated into a pharmaceutically acceptable form as described herein according the the disclosed indications.
- the article of manufacture contains an amount of pharmaceutical agent sufficient for use in treating a condition indicated herein, either in unit or multiple dosages.
- the packaging material comprises a label which indicates the use of the pharmaceutical agent contained therein, e.g., for treating conditions assisted by the inhibition of angiogenesis. and the like conditions disclosed herein.
- the label can further include instructions for use and related information as may be required for marketing.
- the packaging material can include container(s) for storage of the pharmaceutical agent.
- packaging material refers to a material such as glass, plastic. paper, foil, and the like capable of holding within fixed means a pharmaceutical agent.
- the packaging material can be plastic or glass vials, laminated envelopes and the like containers used to contain a pharamaccutical composition including the pharmaceutical agent.
- the packaging material includes a label that is a tangible expression describing the contents of the article of manufacture and the use of the pharmaceutical agent contained therein.
- the monoclonal antibodies, P1F6 and P5H9, were produced using standard hybridoma methods by immunization into RBF/DnJ mice with A549 lung carcinoma cells as described by Wayner et al, J. Cell Biol.. 1 13:919-929 (1991), the disclosure of which is hereby inco ⁇ orated by reference. Spleens were removed from the immunized mice and fused with Ns-1/FOX-NY myeloma cells. 1 lybridomas producing antibody directed to carcinoma cell vitronectin receptors were screened by the specific inhibition of UCLA-P3 adhesion to vitronectin-coated surfaces as described by Wayner et al. and cloned by limiting dilution on thymocyte feeder layers.
- P1F6 and P5H9 monoclonal antibodies have been shown to specifically immunoreact with the ⁇ v ⁇ s complex, and not immunoreact with ⁇ , subunit, with ⁇ 5 subunit, or with other integrins.
- the P1 F6 monoclonal antibody is commercially available from Gibco BRL (Life Technologies, Inc., Gaithersburg, MD) and the P5H9 monoclonal is available from Dr. E. Wayner at the Fred Hutchinson Cancer Research Institute, Seattle, WA.
- ⁇ v ⁇ 5 monoclonal antibodies for use in this invention are similarly derived and characterized as described herein.
- ⁇ v ⁇ 5 monoclonal antibodies are produced by fusing spleens isolated from mice that receive immunizations with the ⁇ v ⁇ f receptor in either an impure or purified form. Purification of the ⁇ v ⁇ s is a procedure well known to one of ordinary skill in the art of integrin biology and has also been described by Smith et al.. J. Biol. Chem.. 265: 1 1008-1 1013 (1990), the disclosure of which is hereby incorporated by reference. Once purified, the isolated receptor is prepared as an immunogen for immunizing mice as described in
- the P5H9 monoclonal antibody prepared in Example 1 was shown by Wayner et al., J. Cell. Biol.. 1 13:919-929 (1991 ) to block attachment of UCLA-P3 carcinoma cells to vitronectin while not affecting cell attachment to collagen or fibronectin.
- the same cells were also shown to contain only the ⁇ v ⁇ ⁇ vitronectin receptor and not one with ⁇ v ⁇ 3 specificity, immunoprecipitating a heterodimer consisting of an ⁇ chain (160 kD) and a ⁇ chain (95 kD) with nonreducing conditions.
- the ⁇ v ⁇ s receptor detected by P5H9 was also shown to mediate adhesion of M21 melanoma cells and H2981 carcinoma cells to vitronectin.
- the P1F6 monoclonal antibody has the same immunoreactivity profile.
- the hybridomas were selected by positive surface staining of A549 cells with the hybridomas culture supernatant and by immunoprecipitation of ⁇ v ⁇ , complexes from surface-labeled A549 extracts.
- the monoclonal antibodies were then used to map the tissue distribution of the ⁇ 5 subunit in normal human thymus, skin and kidney.
- Four micron thick sections were cut from the frozen tissue blocks on a cryostat microtome for subsequent streplavidin-biotin immunoperoxidase staining with antibodies specific for the ⁇ 5 integrins performed as described in the Pasqualini et al. reference.
- thymic sections showed the distribution of ⁇ 5 on blood vessels, Hassal's corpuscles, cortical and medullary stromal cells, and basement membranes.
- Skin sections showed ⁇ 5 on the basal layer of the epidermis and on some dermal blood vessel walls, and kidney sections showed staining of glomerular regions, juxtaglomerular apparatus, proximal convoluted tubules and collecting tubules.
- ⁇ 5 is heterogeneous to different cell types including and, more importantly, on capillary endothelial cells, the staining of which was consistent with staining of cultured umbilical vein endothelial cells.
- Ocular neovascularization is the most common pathological change observed in the vast majority of eye diseases that result in catastrophic loss of vision.
- the growth of new blood vessels from the pre-existing choroidal, retinal or paralimbal vessels can lead to edema, hemorrhage or fibrovascular membrane formation resulting in disruption of the normal anatomic relationships of the eye and concomitant loss of normal visual function.
- angiogenesis is highly regulated and has been shown to be activated by specific angiogenic cytokines such as basic fibroblast growth factor (bFGF) and tumor necrosis factor- ⁇ (TNF- ⁇ ).
- bFGF basic fibroblast growth factor
- TNF- ⁇ tumor necrosis factor- ⁇
- monoclonal antibodies against ⁇ v ⁇ 3 have been shown to be block both bFGF- and TNF- ⁇ - induced angiogenesis in model systems including the CAM model described below.
- monoclonal antibodies against ⁇ v ⁇ 5 block a separate pathway of angiogenesis, specifically that induced by vascular endothelial growth factor (VEGF), transforming growth factor- ⁇ (TGF- ⁇ ) and epidermal growth factor (EGF).
- VEGF vascular endothelial growth factor
- TGF- ⁇ transforming growth factor- ⁇
- EGF epidermal growth factor
- two pathways of angiogenesis are defined by distinct integrins, ⁇ v ⁇ 3 and ⁇ v ⁇ 5 .
- epiretinal neovascular membranes and subretinal neovascular membranes were obtained en bloc at vitrectomy from patients with proliferativc diabetic retinopathy (PDR). These patients had been followed clinically and were selected for histological evaluation on the basis of having active, proliferative neovascular disease documented by clinical examination and fundus fluorescein angiography. The obtained tissue was frozen immediately in Tissue Tek cryopreservative and sectioned.
- the blood vessels were positive for the integrin ⁇ v ⁇ 3 as indicated by immunoreactivity with the mouse monoclonal antibody LM609.
- the distribution of the integrin appeared to be restricted to blood vessels and coincided with staining for a marker of blood vessels, von Willebrand Factor, as mapped with a rabbit antibody to the factor.
- the sites of immunoreactivity were visualized with either rhodamine-conjugated anti-mouse immunoglobulin or fluorescein-conjugatcd anti-rabbit immunoglobulin, the use of both of which allowed co-localization of the integrin location and blood vessel-specific antibodies.
- Specimens obtained from normal eyes or patients with atrophic membranes free from actively proliferating blood vessels were negative for the integrin ⁇ v ⁇ 3 by immunofluorescence.
- ⁇ v ⁇ 5 integrin receptor is selectively expressed in specific tissue types in which angiogenesis is occurring, such as that seen with neovascular membranes from patients having active, proliferative neovascular disease. These tissues, along with those tissues exposed to particular growth factors as described below in Examples 4-6, therefore provide ideal targets for therapeutic aspects of this invention.
- cyclic polypeptides used in practicing the methods of this invention were synthesized using standard solid-phase synthesis techniques as, for example, described by
- H-Arg- Gly-Asp-D-Phe-Val-OH SEQ ID NO 3
- DMF dimethylformamide
- 0.5 g of dicyclohexylcarbodiimide (DCC1), 0.3 g of 1 -hydroxybenzotriazole (HOBt) and 0.23 ml of N-methylmorpholine were added sequentially with stirring.
- the resultant admixture was stirred for another 24 hours at 0C and then at 20C for yet another 48 hours.
- the solution was concentrated and treated with a mixed bed ion exchanger to remove salts. After the resulting resin was removed by filtration, the clarified solution was evaporated and the residue was purified by chromatography resulting in the recovery of cyclo(Arg-Gly-Asp-D-Phe-Val) (also listed in single letter code as c-RGDfV) (SEQ ID NO 4).
- the lower case letters in the peptide indicate the D form of the amino acid and not the L form as indicated by capital letters.
- the cyclic control peptide, cyclo(Arg-Ala-Asp-D-Phe-Val) (also listed in single letter code as RADfV) (SEQ ID NO 5) was prepared as described above.
- the cyclic peptide c- RADfV (SEQ ID NO 5) has previously been shown to inhibit binding of fibrinogen to the integrin ⁇ v ⁇ 3 . and not inhibit binding of fibrinogen to the integrins ⁇ increment b ⁇ 3 or ⁇ , ⁇ , (Pfaff, et al., L Biol. Chem.. 269:20233-20238, 1994).
- peptides that are specifically inhibitory to the binding of natural ligands to ⁇ v ⁇ 5 arc similarly prepared as tested for specificity and range of activity as described in the following examples. These include the following peptides that were analogously obtained: cyclo(Gly- D-Arg-Gly-Asp-Phe-Val) (SEQ ID NO 6) and cyclo( Arg-Gly-Asp-Phe-D-Val) (SEQ ID NO 7).
- Fmoc-Arg(Mtr)-Gly-Asp(OBut)-DPhe-NMeVaI-ONa is synthesized using solid-phase Merrifield-type procedures by sequentially adding NMeVal, DPhe, Asp(OBut). Gly and Fmoc-Arg(Mtr) in a step-wise manner to a 4-hydroxymethyl- phenoxymethyl-polystyrene resin (Wang type resin) (customary Merrifield-type methods of peptide synthesis are applied as described in Houben-Weyl, I .e., Volume 15/11, Pages 1 to 806 (1974). The polystyrene resin and amino acid residues precursors are commercially available from Aldrich, Sigma or Fluka chemical companies).
- the resin is then eliminated from the peptide chain using a 1 : 1 mixture of TFA/dichloromethane which provides the Fmoc-Arg(Mtr)-Gly-Asp(OBut)-DPhe-NMeVal- OH product.
- the Fmoc group is then removed with a 1 :1 mixture of piperidine/DMF which provides the crude Arg(Mtr)-Gly-Asp(OBut)-DPhe-NMeVal-OH precursor which is then purified by HPLC in the customary manner.
- TFA salt is removed from the above-produced cyclic peptide by suspending the cyclo-(Arg-Gly-Asp-DPhe-NmeVal) x TFA in water followed by evaporation under vacuum to remove the TFA.
- the cyclic peptide formed is referred to as an "inner salt” and is designated cyclo-(Arg-Gly-Asp-DPhe-NMeVal).
- inner salt is used because the cyclic peptide contains two oppositely charged residues which intra-electronically counterbalance each other to form an overall noncharged molecule. One of the charged residues contains an acid moiety and the other charged residue contains an amino moiety. When the acid moiety and the amino moiety are in close proximity to one another, the acid moiety can be deprotonated by the amino moiety which forms a carboxylate/ammonium salt species with an overall neutral charge.
- HC1 treatment to give cyclo-iArg-Gly-Asp-DPhe-NMeVa ⁇ x HC1 80 mg of cyclo-(Arg-Gly-Asp-DPhe-NMeVal) are dissolved in 0.01 M HC1 five to six times and freeze dried after each dissolving operation. Subsequent purification by HPLC give cyclo-(Arg-Gly-Asp-DPhe-NMeVal) x HC1; FAB-MS (M+H): 589.
- the peptides designated with an asterisk are prepared in HC1 and are identical in sequence to the peptide designated on the same line; the peptides without an asterisk are prepared in TFA. Lower case letters indicate a D-amino acid; capital letters indicate a L-amino acid. ** The human MMP-2 amino acid residue sequences for synthetic peptides are indicated by the corresponding residue positions shown in Figures 15A and 15B and also in Figure 16. (MMP-2 refers to a member of the family of matrix metalloproteinase enzymes). The human MMP-2 sequences are listed with the natural cysteine residues but are not listed with engineered cysteine residues as described for the fusion peptides. The non-natural cysteine residues were substituted for the natural amino acid residue at the indicated residue positions in order to facilitate solubility of the synthetic as well as expressed fusion proteins and to ensure proper folding for presentation of the binding site.
- the chicken MMP-2 amino acid residue sequences for synthetic peptides are indicated by the corresponding residue positions shown in Figures 15A and 15B.
- the chicken MMP-2 sequences are listed with the natural cysteine residues but not with the engineered cysteine residues as described for the fusion peptides as described above.
- the effect of anti- ⁇ , ⁇ ⁇ antagonists on growth factor-induced angiogenesis can be observed in naturally transparent structures as exemplified by the cornea of the eye.
- New blood vessels grow from the rim of the cornea, which has a rich blood supply, toward the center of the cornea, which normally does not have a blood vessels.
- Stimulators of angiogenesis such as VEGF and TGF- ⁇
- Antagonists of angiogenesis applied to the cornea, inhibit the growth of new blood vessels from the rim of the cornea.
- the cornea undergoes angiogenesis through an invasion of endothelial cells from the rim of the cornea into the tough collagen-packed corneal tissue which is easily visible.
- the rabbit eye model assay therefore provides an in vivo model for the direct observation of stimulation and inhibition of angiogenesis following the implantation of compounds directly into the cornea of the eye.
- Hydron polymer pellets containing growth factor and monoclonal antibodies were prepared as described by D'Amato, et al., Proc. Natl. Acad. Sci., 91 :4082-4085 ( 1994).
- the individual pellets contained 750 ng of the growth factor (also referred to as cytokine), specifically either bFGF or VEGF, bound to sucralfate (carafate) (Carafet, Marion Merrell Dow Co ⁇ oration, Cincinnati, OH) to stabilize the cytokines and ensure their slow release into the surrounding tissue.
- hydron pellets were prepared which contained either 40 ⁇ g of the mAb P1F6 (anti- ⁇ v ⁇ s ) or the control antibody, LM609 (anti- ⁇ v ⁇ 3 ), in PBS.
- the pellets were cast in specially prepared Teflon pegs that had a 2.5 mm core drilled into their surfaces. Approximately 12 ⁇ l of casting material was placed into each peg and polymerized o ⁇ ernight in a sterile hood. Pellets were then sterilized by ultraviolet irradiation.
- a series of eight animals were used for paired eye experiments where each animal received a Hydron implant containing a preselected cytokine with a preselected antibody or control immunoglobulin.
- one cornea was surgically implanted with a Hydron pellet containing either bFGF or VEGF in conjunction with mAb P 1 F6 and the other cornea was treated with either bFGF or VEGF in conjunction with MAb LM609.
- Individual pellets were implanted into surgically created "pockets" formed in the mid-stroma of the cornea of rabbits. The surgical procedure was done under sterile technique using a Wild model M691 operating microscope equipped with a beamsplitter to which was mounted a camera for photographically recording individual corneas.
- a 3 mm by 5 mm “pocket " was created in the corneal stroma by making a 3 mm incision to half the corneal thickness with a 69 Beaver blade.
- the stroma was dissected peripherally using an iris spatula and the pellet was implanted with its peripheral margin 2 mm from the limbus.
- the cytokines and mAbs diffused from the implanted pcllets into the surrounding tissue thereby effecting angiogenesis from the rim of the cornea.
- the left and right corneas are respectively referred to as OS and OD.
- the corneas were then observed for 12 days. Photographs were taken on postoperative day 10, the time at which neovascularization is maximal. Representative photographic results of the above-treatments with cytokine/mAb admixtures are shown in Figures 1 A- I D.
- the parallel quantitation of mAb inhibition of cytokme-induced angiogenesis is shown in Figures 2A and 2B.
- Figures IA and ID in which corneas were respectively exposed to bFGF/PlF6 and VEGF/LM609 combinations, cytokine- induced angiogenesis with edema is prominent as indicated by the large arrows.
- the ⁇ v ⁇ ⁇ antibody, P1F6, was not effective at inhibiting bFGF-induced angiogenesis.
- the ⁇ v ⁇ 3 antibody, LM609 was not effective at inhibiting VEGF-induced angiogenesis.
- FIGS. 2A and 2B The effects of specific mAb integrin immunoreactivity on the above cytokine-induced angiogenesis is also quantified as shown in Figures 2A and 2B.
- Angiogenesis was stimulated with either bFGF or VEGF as shown respectively in Figures 2A and 2B.
- the treated eyes were photographed daily through a Wild operating microscope outfitted with a Nikon camera.
- LM609 reduced bFGF-induced angiogenesis by 86% (p ⁇ 0.005, paired t-test) when compared to treatment of the paired eye on the same animal with P1 F6.
- VEGF was used to stimulate angiogenesis as shown in Figure 2B, the opposite effect was observed where P1F6 reduced the mean area of neovascularization by 60% (p ⁇ 0.03, paired t- test) compared to the LM609-treated eye that had a minimal effect on VEGF-induced angiogenesis.
- Each experiment consisted of eight rabbits in which one eye received a pellet comprising 100 nanograms (ng) bFGF and the other eye received a pellet comprising 1 microgram (ug) VEGF.
- the pellets were inserted into the corneal pocket as described above, and the cytokines subsequently stimulated the growth of new blood vessels into the cornea.
- Peptides were administered subcutaneously (s.q.) in 1 ml PBS at an initial dosage of
- Rabbits receiving control peptide 69601 showed substantial corneal blood vessel growth at 7 days, in both vFGF and VEGF stimulated eyes. Rabbits receiving peptide 85189 showed less than 50% of the amount of corneal blood vessel growth compared to controls in vFGF- stimulated eyes and nearly 100% inhibition in VEGF-stimulated eyes.
- Angiogenesis can be induced on the chick chorioallantoic membrane (CAM) after normal embryonic angiogenesis has resulted in the formation of mature blood vessels.
- Angiogenesis has been shown to be induced in response to specific cytokines or tumor fragments as described by Leibovich et al., Nature. 329:630 (1987) and Ausprunk et al., Am. J. Pathol.. 79:597 (1975).
- CAMs were prepared from chick embryos for subsequent induction of angiogenesis and inhibition thereof as described below and in Example 6 with the ⁇ v ⁇ 5 antagonists of this invention.
- the resultant CAM preparation was then used at 10 days of embryogenesis where angiogenesis has subsided.
- the preparation was thus used in this invention for inducing renewed angiogenesis in response to cytokine treatment.
- Typical of an untreated 10 day old CAM is an area devoid of blood vessels.
- the system is useful in this invention for stimulating with various cytokines the production of new vasculature from existing vessels from adjacent areas into areas of the CAM currently lacking any vessels.
- the blood vessels are undergoing new growth in normal embryogenesis or induced by cytokines, the blood vessels are expressing ⁇ v ⁇ 3 and ⁇ v ⁇ v
- Angiogenesis has been shown to be induced by cytokines or growth factors as described in Example 4A in the rabbit eye model.
- angiogenesis in the rabbit corneal preparation described in Example 4 was similarly induced by growth factors that were topically applied onto the CAM blood vessels as described herein.
- Angiogenesis was induced by placing a 5 millimeter (mm) X 5 mm Whatman filter disk
- HBSS Hanks Balanced Salt Solution
- GIBCO Hanks Balanced Salt Solution
- HBSS containing preselected cytokines at a preselected concentration i.e., one to test the effect on angiogenesis
- Angiogenesis was monitored by photomicroscopy after 72 hours.
- CAMs were snap frozen then 6 ⁇ m cryostat sections were fixed with acetone and stained by immunofluorescence as described in Example 2B and 2C with 10 ⁇ g/ml of selected anti-integrin antibodies, including those directed against ⁇ v ⁇ 5 as described in Example 1.
- Example 6 The effect of exposure of a CAM as described herein to the cytokines VEGF, TGF- ⁇ and EGF in relationship to the expression of ⁇ v ⁇ ,, to angiogenesis and inliibition thereof with ⁇ v ⁇ ⁇ antagonists is described in Example 6.
- ⁇ v ⁇ in tumor-induced angiogenesis.
- various ⁇ v ⁇ r negative human melanoma and carcinoma fragments are used in the CAM assay that are previously grown and isolated from the CAM of 17 day chick embryo as described by Brooks et al.. J. Cell Biol.. 122: 1351 (1993) and as described herein.
- Angiogenesis is induced in the CAM assay system by direct apposition of a tumor fragment on the CAM.
- Preparation of the chick embryo CAM is identical to the procedure described above. Instead of a filter paper disk, a 50 milligram (mg) to 55 mg in weight fragment of one ⁇ v ⁇ 5 -negative tumor resulting from growth of cell line suspensions described below, is placed on the CAM in an area originally devoid of blood vessels.
- the cell lines rabdomyosarcoma, myeloid (HL-60 or KG-1 ). and lymphoid (T cells - Jurkat. HPB/ALL. PEER; and various B cell lines) as described by Pasqualini et al. J. Cell Sci.. 105:101 -1 1 1 (1993), are used to grow the solid human tumors on the CAMs of chick embryos.
- a single cell suspension of the various cell lines are first applied to the CAMs in a total volume of 30 ul of sterile HBSS. The windows arc sealed with tape and the embryos are incubated for 7 days to allow growth of human tumor lesions.
- the tumors are resected from the CAMs and trimmed free of surrounding CAM tissue.
- the tumors are sliced into 50 mg to 55 mg tumor fragments for use in angiogenesis.
- the tumor fragments are placed on a new set of 10 day chick embryo CAMs as described in Example 5 A in an area devoid of blood vessels.
- ⁇ v ⁇ 5 -inducing cytokines VEGF, TGF- ⁇ , or EGF
- mAbs, P1F6 or P5FI9 mAbs, P1F6 or P5FI9
- hamster melanoma cells obtained from Dr. Caroline Damsky from University of California at San Francisco, were used in the CAM assay as described above for formation of melanoma tumors.
- CS-1 hamster melanoma cells
- separate preparations received an intravenous injections of either 100 ⁇ g or 300 ⁇ g of P1F6 antibody, LM609 antibody or control CSAT (anti- ⁇ l ) antibody.
- An additional control included a preparation that received no treatment. The results are discussed below in Example 6D.
- the preparation of the chick embryo CAMs for intravenous injections was essentially as described above.
- Angiogenesis was first induced on 10 day old chick embryos by application of growth factor-saturated filter disks. Specifically, in the first assays, angiogenesis was induced by exposure to either bFGF or VEGF, each at a concentration of 150 ng/ml.
- a second small window was carefully cut on the lateral side of the egg shell directly over prominent blood vessels selected previously.
- the outer egg shell was carefully removed leaving the embryonic membranes intact.
- the shell membrane was made transparent with a small drop of mineral oil (Perkin-Elmer Co ⁇ , Norwalk, CT) which allowed the blood vessels to be visualized easily.
- phosphate buffered saline (PBS) 75 ⁇ g of purified sterile anti-integrin antibodies or 75 ⁇ g of synthetic peptides (cyclic peptide RGDfV, SEQ ID NO 4 and control cyclic peptide RADfV, SEQ ID NO 5) in PBS were injected into blood vessels apparent on the growth factor-induced CAMs.
- the windows were sealed with tape and the embryos were allowed to incubate until 72 hours.
- both bFGF and VEGF caused angiogenesis in the control PBS-treated CAM.
- the LM609 ⁇ v ⁇ 3 - specific antibody inhibited bFGF-induced angiogenesis (Figure 3E) but had little effect on angiogenesis in the VEGF-induced CAM ( Figure 3F).
- the effect of the peptides on VEGF-induced angiogenesis is measured through a determination of the number of blood vessel branch points.
- angiogenesis or the lack therof was quantified by counting the number of blood vessels branch points that occur within the confines of the filter discs.
- the branched blood vessels are considered to correspond primarily to new angiogenic sprouting blood vessels.
- Quantification was performed in a double blind manner by at least two independent observers. The results are expressed as the Angiogenic Index where the angiogenic index is the number of branch points (VEGF stimulated) minus the number of branch points (control unstimulated) per filter disc. Experiments routinely had 6-10 embryos per condition.
- both peptides 85189 and 121974 completely inhibited angiogenesis as indicated by a reduction of the measurable branch points in comparison to untreated or control peptide-treated preparations.
- TGF- ⁇ tumor necrosis factor- ⁇
- TGF- ⁇ transforming growth factor- ⁇
- PMA 4- ⁇ -phorbol-12-myristate-13-acetate
- cytokines including bFGF and VEGF
- PMA was used at a concentration of 20 ng/ml.
- the antibodies, LM609 and P1F6, or the protein kinase C (PKC) inhibitor, calphostin C were separately provided to the CAM model, either by a single intravascular dose as described above or by topical administration as described below in the next example.
- the antibodies were used at a concentration of 75 ⁇ g per embryo and the calphostin C was at a dosage of 100 nM.
- filter discs and associated CAM tissue were dissected and analyzed for angiogenesis with a stereo microscope.
- Angiogenesis was scored in a double blind manner by analyzing the number and extent of branching of the blood vessels within the area of the discs. The scores ranged from low (1 ) to high (4).
- the angiogenesis index was determined by subtracting a background score of 1 from all data. Experiments were repeated 2-4 times with 5- 6 embryos per condition.
- PMA protein kinase C
- PKC protein kinase C
- filter disks saturated with growth factors described above are placed on CAMs to induce angiogenesis followed by application of either PI F6 or LM609.
- Disks are then treated with 50 ml HBSS containing 25 mg of mAb in a total volume of 25 ⁇ l of sterile HBSS at 0, 24, and 48 hours. At 72 hours.
- CAMs are harvested and placed in a 35 mm petri dish and washed once with 1 ml of PBS. The bottom side of the filter paper and CAM tissue is then analyzed under an Olympus stereo microscope, with two observers in a double-blind fashion. Angiogenesis inhibition is considered significant when CAMs exhibits
- filter disks saturated with mAbs are placed on vascularized regions of CAMs from 10 day embryos that do not receive topical application of cytokine.
- CAM assays are also performed with the synthetic peptides of this invention to determine the effect of cyclic and linearized peptides on growth factor induced angiogenesis.
- Eight ⁇ g of peptides, prepared as previously described, are separately presented in a total volume of 25 ⁇ l of sterile HBSS.
- the peptide solution is applied to the CAM preparation immediately and then again at 24 and 48 hrs. At 72 hours the filter paper and surrounding CAM tissue are dissected and viewed as described above.
- mAbs are separately topically applied to the tumor fragments at a concentration of 25 ⁇ g in 25 ⁇ l of HBSS and the windows are then sealed with tape. The mAbs are added again in the same fashion at 24 hours and 48 hours. At 72 hours, the tumors and surrounding CAM tissues are analyzed as described above.
- tumors are initially derived by transplanting human cell lines, which do not express integrin ⁇ v ⁇ 5 , onto the CAMs of 10 day old chick embryos.
- integrin ⁇ v ⁇ 5 integrin ⁇ v ⁇ 5
- blood vessels entering the tumor within the focal plane of the CAM are counted under a stereo microscope by two observers in a double-blind fashion.
- the synthetic peptides prepared in Example 3, the MMP-2 preparations described in Example 7 and the organic molecules prepared in Example 10 are similarly topically applied to the tumor-induced angiogenic CAM assay system as described above.
- the effect of the peptides including the MMP-2 preparations and organic molecules described in this invention on the viability of the vessels is similarly assessed.
- Tumor-induced blood vessels prepared above were also treated with mAbs applied by intravenous injection.
- CS-1 melanoma tumors were placed on the CAMs as described in Example 5C and the windows were sealed with tape and 24 hours later, 100 to 300 ⁇ g of purified mAbs were inoculated once intravenously in chick embryo blood vessels as described previously. The chick embryos were then allowed to incubate for 7 days. The extent of angiogenesis was then observed as described in above. After this time period, the tumors were resected and analyzed by their weight to determine the effect of antibody exposure on tumor growth or suppression.
- the effects of peptides, MMP-2 preparations or organic molecules on tumor-induced vasculature in the CAM assay system are also assessed.
- the tumor-CAM preparation is used as described above with the exception that instead of intravenous injection of a mAb, synthetic peptides including MMP-2 preparations prepared as described in Example 7 and organic molecules prepared in Example 10 are separately intravenously injected into visible blood vessels.
- additional tumor regression assays were performed with the ⁇ v ⁇ 5 -reactive peptide 85189 (SEQ ID NO 9) against 69601 (SEQ ID NO 5) as a control.
- the assays were performed as described above with the exception that 100 ug of peptide was intravenously injected into the CAM at 18 hourst postimplantation of the various tumors which in this case included UCLAP-3, M21-L and FgM tumor types. After 48 hours more, the tumors were then resected and wet weights were obtained.
- Figures 18, 19 and 20 respectively show the reduction in tumor weight for UCLAP-3. M21 -L and FgM tumors following intravenous exposure to peptide 85189 in contrast to the lack of effect with either PBS or peptide 69601.
- CS-1 hamster melanoma cells lacking expression of ⁇ v ⁇ 3 and ⁇ v ⁇ 5 are first transfected with an plasmid for expressing the ⁇ , subunit as previously described by Filardo et al., J. Cell Biol.. 130:441-450 (1995). Specificity of potential ⁇ v ⁇ s antagonists was determined by the ability to block the binding of ⁇ v ⁇ 5 -exprcssing CS-1 cells to VN or laminin coated plates.
- the wells were first coated with 10 ug/ml substrate overnight. After rinsing and blocking with 1% heat-denatured BSA in PBS at room temperature for 30 minutes, peptide 85189 (SEQ ID NO 9) over a concentration range of 0.0001 uM to 100 uM. are separately mixed with CS-1 cells for applying to wells with a cell number of 50,000 cells/well. After a 10-15 minute incubation at 37C, the solution containing the cells and peptides is discarded. The number of attached cells is then determined following staining with 1 % crystal violet. Cell associated crystal violet is eluted by the addition of 100 microliters ( ⁇ l) of 10% acetic acid. Cell adhesion was quantified by measuring the optical density of the eluted crystal violet at a wave length of 600 nm.
- MMP-2-derived polypeptides include regions of the C-terminus of MMP-2 active in the binding interaction with ⁇ , ⁇ , and thereby capable of inhibiting MMP-2 activation and associated activities. These polypeptides are prepared either as synthetic polypeptides having a sequence derived from the C-terminal domain of MMP-2 as described in Example 1 or as fusion proteins including all or a portion of the C- terminal domain of MMP-2, prepared as described below. MMP-2 C-terminal molecules arc presented for both chicken and human specific sequences.
- the chicken-derived MMP-2 C-tcrminal domain also referred to as the hemopexin domain immediately contiguous with the hinge region, comprises the amino acid residues 445- 637 of MMP-2.
- the complete nucleotide and encoded amino acid sequence of chicken MMP-2 is described below and is shown in Figures 15A and 15B, with the nucleotide and amino acid sequences respectively listed as SEQ ID NOs 23 and 24.
- the human MMP-2 nucleotide and encoded amino acid sequence is also described below, with the latter shown in Figure 16 and SEQ ID NO 25.
- the C-terminal domain in the human MMP-2 that corresponds to the chicken region of 445-637 begin at amino acid residue 439 and ends with 631 due to six missing residues from the human sequence as shown in Figures 15A and 15B.
- Both human- and chicken-derived C-terminal MMP-2 synthetic peptides for use in practicing the methods of this invention are listed in Table 1. ' I he amino acid residue sequences of the synthetic peptides are the same as those generated by the recombinant fusion protein counte ⁇ arts but without the GST fusion component.
- the C-terminal MMP-2 fusion proteins derived from both chicken-and human are prepared as described below.
- a MMP-2 fusion protein is a chimeric polypeptide having a sequence of MMP-2 C- terminal domain or a portion thereof fused (operatively linked by covalent peptide bond) to a carrier (fusion) protein, such as glutathione sulfhydryl transferase (GST).
- GST glutathione sulfhydryl transferase
- the putative initation of translation is marked with three forward arrowheads and the translation termination signal (TGA) is indicated by an asterisk.
- the amino terminal sequences for the chicken proenzyme and active enzyme are contained with diamonds and single arrowheads.
- the chicken progelatinasc nucleotide and amino acid residue sequences are listed together as SEQ ID NO 23 while the encoded amino acid residue sequence is listed separately as SEQ ID NO 24.
- RT-PCR Reverse transcriptase polymerase chain reaction
- 2 fusion proteins having sequences corresponding to the amino acid residue positions as shown in Figures 15A and 15B and also listed in SEQ ID NO 24: 1 ) 203-637; 2) 274-637; 3) 292- 637; 4 ) 410-637; 5) 445-637.
- Upstream or 5' primers for amplifying each of the nucleotide regions for encoding the above-listed MMP-2 fusion proteins were designed to encode the polypeptide start sites 3' to an engineered, i.e., PCR-introduced, internal BamHI restriction site to allow for directional ligation into either pGEX-l ⁇ T or pGEX-3X expression vectors.
- the 5' primers included the following sequences, the 5' and 3' ends of which correspond to the indicated 5' and 3' nucleotide positions of the chicken MMP-2 sequence shown in the figure (the amino acid residue position start sites are also indicated for each primer): 1 ) Nucleotides 599- 619, encoding a 203 start site 5 ⁇ TGGGATCCACTGCAAATTTC3' (SEQ ID NO 27); 2) Nucleotides 809-830, encoding a 274 start site 5'GCCGGATCCATGACC ⁇ GTGTA3' (SEQ ID NO 28); 3) Nucleotides 863-883, encoding a 292 start site 5'GTGGGATCCCTGAAGACTATG3' (SEQ ID NO 29); 4) Nucleotides 1217-1237, encoding a 410 start 5 ⁇ GGGGATCCTTAAGGGGATTC3' (SEQ ID NO 30); and 5) Nucleotides 1325- 1345, encoding a 445 start site
- the indicated nucleotide regions of the template cDNA were subsequently amplified for 35 cycles (annealing temperature 55C) according to the manufacturer's instructions for the Expand High Fidelity PCR System (Boehringer Mannheim).
- the resulting PCR products were gel-purified, digested with BamFII and EcoRI restriction enzymes, and repurified before ligation into either pGEX-l ⁇ T or pGEX-3X vector (Pharmacia Biotech, Uppsala, Sweden) which had been similarly digested as well as dephosphorylated prior to the ligation reaction.
- the choice of plasmid was based upon the required reading frame of the amplification product. Competent E.
- coli strain BSJ72 or BL21 cells were transformed with the separate constructs by heat shock.
- the resulting colonies were screened for inco ⁇ oration of the respective MMP-2 fusion protein- encoding plasmid by PCR prior to dideoxy sequencing of positive clones to verify the integrity of the introduced coding sequence.
- verification of incorporation of plasmid was confirmed by expression of the appropriately-sized GST-MMP-2 fusion protein.
- fusion proteins were designed to contain engineered terminal cysteine residues at the amino- or carboxy-terminus of the chicken MMP-2 sequences of interest so as to provide for disulfide- bonding with the naturally occurring cysteine at the other terminus, as required by the construct.
- Synthetic MMP-2 fragments for both chicken and human are similarly prepared as previously described in Example 3.
- Oligonucleotide primers were accordingly designed to allow for amplification of chicken MMP-2 C-terminal regions for expression of soluble MMP-2/GST fusion proteins.
- Amplified chicken MMP-2 C-terminal regions included those for encoding amino acid residue positions 445-518, 445-552, 516-637 and 549-637.
- residue 517 the naturally encoded tyrosine residue was substituted for a cysteine to allow for disulfide bonding with either cysteine at residue position 446 or 637.
- residue 551 the naturally encoded tryptophan residue was substituted for a cysteine to allow for disulfide bonding with either naturally encoded cysteine at residue position 446 or 637.
- the pGEX-3X plasmid construct encoding the recombinant GST/MMP-2(410- 637) fusion protein prepared above was used as a template for amplification according to the manufacturer's protocol for the Expand High Fidelity PCR Kit (Boehringer Mannheim) utilizing a set of oligonucleotide primers whose design was based on the published chicken MMP-2 sequence (also shown in Figures 15A and 15B and in SEQ ID NO 23).
- One upstream primer designed to encode a chicken MMP-2 protein start site at position 445 after an engineered internal BamFII endonuclease restriction site for insertion into the pGEX-3X GST vector, had the nucleotide sequence (5'CTCGGATCCTCTGCAAGCACG3' (SEQ ID NO 32)).
- the 5 * and 3' ends of the primer respectively corresponded to positions 1325-1345 of the chicken MMP-2 sequence in Figure 15 A and 15B.
- Another upstream primer designed to encode a chicken MMP-2 protein start site at position 516 after an engineered internal BamHI restriction site for insertion into the pGEX-1 ⁇ T GS ' l vector and to encode a cysteine residue at position 517, had the nucleotide sequence (5'GCAGGATCCGAGTGCTGGGTTT ⁇ TAC3 * (SEQ ID NO 33)).
- the 5' and 3' ends of the primer respectively corresponded to positions 1537-1562 of the chicken MMP-2 sequence in the figure.
- a third upstream primer designed to encode a chicken MMP-2 protein start site at position 549 following an engineered internal EcoRI endonuclease restriction site for insertion into the pGEX-l ⁇ T GST vector and to encode a cysteine residue at position 551, had the nucleotide sequence (5'GCAGAATTCAACTGTGGCAGAAACAAG3' (SEQ ID NO 34)). The 5' and 3' ends of the primer respectively corresponded to positions 1639-1665 of the chicken MMP-2 sequence in the figure.
- These upstream primers were separately used with one of the following downstream primers listed below to produce the above-described regions from the C-terminal domain of chicken MMP-2.
- a first downstream primer designed to encode a chicken MMP-2 protein termination site at position 518, to encode a cysteine residue at position 517, and to contain an internal F.coRI endonuclease restriction site for insertion into a GST vector, had the nucleotide sequence f5'GT ⁇ GA ⁇ TTCCAGCACTCATTTCCTGC3' (SEQ ID NO 35)).
- a second downstream primer designed to encode a chicken MMP-2 protein termination site at position 552, to encode a cysteine residue at position 551 , and to contain an internal EcoRI endonuclease restriction site for insertion into a GST vector, had the nucleotide sequence
- a third downstream primer designed to encode a chicken MMP-2 protein termination site at position 637 and to contain an internal EcoRI endonuclease restriction site for insertion into a GS T vector, had the nucleotide sequence (5 ⁇ TTGAATTCTTCTACAGTTCA3 1 (SEQ ID NO 37)).
- the vectors were similarly digested as well as dephosphorylated prior to the ligation reaction. Competent E. coli strain BL21 cells were then separately transformed with the resultant MMP-2-containing vector constructs by heat shock. Resulting colonies were then screened for inco ⁇ oration of the appropriate fusion protein-encoding plasmid by PCR and production of the appropriate sized GST-fusion protein prior to dideoxy sequencing of positive clones to verify the integrity of the introduced coding sequence. Purification of recombinant GST fusion proteins were then performed using IPTG-induced log-phase cultures essentially as described above for producing the other GST-MMP-2 fusion proteins.
- human MMP-2 GST fusion proteins were produced for expressing amino acid regions 203-631 and 439- 631 of the mature human MMP-2 proenzyme polypeptide. The indicated regions correspond respectively to chicken MMP-2 regions 203-637 and 445-637.
- Human MMP-2-GST fusion proteins were produced by PCR as described above for the chicken MMP-2-GST fusion proteins utilizing a cDNA template that encoded the entire human MMP-2 open reading frame provided by Dr. W. G. Stetler-Stevenson at the National Cancer Institute. Bcthesda, MD. Upstream 5' primer sequences were designed based upon the previously published sequence of human MMP- 2 (Collier et al., J. Biol. Chem.. 263:6579-6587 (1988) and to encode an introduced internal EcoRI restriction site to allow for insertion of the amplified products into the appropriate expression vector.
- One upstream primer designed to encode a human MMP-2 protein start site at position 203 alter an engineered internal EcoRI endonuclease restriction site for insertion into the pGEX- UT GST vector, had the nucleotide sequence (5'G ⁇ T G ⁇ TTCT ⁇ CTGCAAGTT3' (SEQ ID NO: 1)
- the 5' and 3' ends of the primer respectively corresponded to positions 685-704 of the human MMP-2 open reading frame sequence.
- Another upstream primer designed to encode a human MMP-2 protein start site at position 439 after an engineered internal EcoRI restriction site for insertion into the pGEX-l ⁇ T GST vector, had the nucleotide sequence (5'CACTGAATTCATCTGCAAACA3' (SEQ ID NO 39)).
- the 5' and 3' ends of the primer respectively corresponded to positions 1392 and 1412 of the human MMP-2 open reading frame sequence.
- each of the above primers were used separately with a downstream primer, having 5' and 3' ends respectively complementary to bases 1998 and 1978 of the human MMP-2 sequence that ends distal to the MMP-2 open reading frame and directs protein termination after amino acid residue 631.
- the amplified products produced expressed fusion proteins containing human MMP-2 amino acid residues 203-631 (SEQ ID NO 40) and 439-631 (SEQ ID NO 12).
- PCR products were purified, digested with EcoRI and repurified for ligation into a pGEX-l ⁇ T plasmid that was similarly digested and dephosphorylated prior to the ligation reaction.
- Cells were transformed as described above.
- ⁇ v ⁇ 5 -immunoreactive antibodies and synthetic peptides prepared respectively in Examples 1 and 3 are screened by measuring their ability to antagonize ⁇ v ⁇ 5 , ⁇ v ⁇ 3 , and ⁇ sanction b ⁇ 3 receptor binding activity in purified ligand-receptor binding assays.
- the method for these binding studies has been described by Barbas et al., Proc. Natl. Acad. Sci.. USA. 90: 10003- 10007 ( 1993), Smith et al., J. Biol. Chem.. 265: 1 1008-1 1013 (1990) and Pfaff et al., J. Biol. Chem..
- a method of identifying antagonists in a ligand-receptor binding assay is described in which the receptor is immobilized to a solid support and the ligand and antagonist are soluble.
- a ligand-receptor binding assay is also described in which the ligand is immobilized to a solid support and the receptor and antagonists are soluble.
- integrins are separately immobilized in Titertek microtiter wells at a coating concentration of 50 nanograms (ng) per well.
- the purification of the receptors used in the ligand-receptor binding assays are well known in the art and are readily obtainable with methods familiar to one of ordinary skill in the art.
- After incubation for 18 hours at 4C, nonspecific binding sites on the plate are blocked with 10 milligrams/milliliter (mg/ml) of bovine scrum albumin (BSA) in Tris-buffered saline.
- BSA bovine scrum albumin
- vitronectin for ⁇ v ⁇ 5 and ⁇ v ⁇ 3 and fibrinogen for ⁇ , lb ⁇ 3 inhibition of binding studies using either antibodies or peptides to block the binding of vitronectin to either receptor allows for the accurate determination of the amount in micromoles ( ⁇ M) of peptide necessary to half-maximally inhibit the binding of receptor to ligand.
- Radiolabeled ligands are used at concentrations of 1 nM and binding is challenged separately with unlabeled synthetic peptides. Following a three hour incubation, free ligand is removed by washing and bound ligand is detected by gamma counting.
- the ligand-receptor assay described herein is used to screen for both circular or linearized synthetic peptides along with monoclonal antibodies and organic molecules that exhibit selective specificity for a particular integrin receptor, specifically ⁇ v ⁇ 5 , as used as vitronectin receptor ( ⁇ v ⁇ 5 ) antagonists in practicing this invention.
- An in vivo chimeric mouse:human model was generated by replacing a portion of skin from a SCID mouse with human neonatal foreskin.
- the in vivo chimeric mouse:human model was prepared essentially as described in Yan, et al., J. Clin. Invest.. 91 :986-996 (1993). Briefly, a 2 cnr square area of skin was surgically removed from a SCID mouse (6-8 weeks of age) and replaced with a human foreskin. The mouse was anesthetized and the hair removed from a 5 cm 2 area on each side of the lateral abdominal region by shaving. Two circular graft beds of 2 cm 2 were prepared by removing the full thickness of skin down to the fascia.
- the human foreskin was inoculated with melanoma cells.
- the M21 L human melanoma cell line was used to form the solid human tumors on the human skin grafts on the SCID mice.
- a single cell suspension of 2 x 10 6 M21L was injected intradermally into the human skin graft. The mice were then observed for 2 to 4 weeks to allow growth of measurable human tumors.
- a measurable tumor was established, either 250 ⁇ g of the peptide (in a volume of 100 ⁇ l ⁇ having SEQ ID NO 9 (cyclic RGD-containing peptide Arg-Gly-Asp-D-Phe-Asn- NMeVal) or a control peptide, cyclo ⁇ rg- ⁇ la- ⁇ sp-D-Phe-Val, were injected intraperitoneally into the mouse 3 times per week over 3 weeks. At the end of this time, the tumor was excised and analyzed by weight and histology.
- the response with mAB LM609 was compared with the response obtained with the synthetic peptide 85189 (SEQ ID NO 9) as compared to control synthetic peptide 69601 (SEQ ID NO 5).
- the assays were performed as described above, fhe results, shown in Figure 21 , demonstrate that the synthetic peptide 85189 reduced tumor volume to below 25 mm 3 as compared to control peptide where the tumor volume was approximately 360 mm 3 .
- the mAB LM609 also significantly reduced tumor volume to approximately 60 mm 3 .
- peptide 85189 treatment effectiveness For analyzing peptide 85189 treatment effectiveness over a time course, two treatment regimens were evaluated in the same SCID tumor model.
- treatment with either peptide 85189 or 69601 was initiated on day 6, with day 0 being the day of M21-L tumor injection of 3 X 10 6 cells subcutaneously into mouse skin, with intraperitoneal injections of 250 ⁇ g/ml peptide 85189 or control 69601 every other day until day 29.
- the other assay was identically performed with the exception that treatment was initiated on day 20.
- the tumors were resected and the mean tumor volume in mm' was determined. The data was plotted as this value +/- the standard error of the mean.
- peptide 85189 is an effective ⁇ v ⁇ 5 antagonist of both angiogenesis and thus tumor growth.
- Example 2C Based on the observation in Example 2C of ⁇ v ⁇ 3 and ⁇ v ⁇ 5 expression in retinal neovascular tissue, a novel mouse model was used to study the effects of systemically administered cyclic peptide antagonists of both integrins on retinal angiogenesis.
- Newborn mice develop retinal vessels during the first two weeks poslnatally during which time the superficial retinal vasculature forms a rich, highly branched network of vessels that originate at the optic nerve head and radiate peripherally to cover the retinal surface in a manner similar to that observed in other mammals and humans (Jiang et al., Glia. 15: 1-10 (1995).
- mice were injected subcutaneously twice daily for four days starting from day 0 with the cyclic peptide RGDfV (SEQ ID NO 4) (also referred to as peptide 203) or the control peptide RADfV (SEQ ID NO 5).
- RGDfV also referred to as peptide 203
- RADfV control peptide RADfV
- Step i Compound 11 (1.3 g (2.6 mmol) was dissolved in 20 mL of ethyl acetate/ methanol/ water 5/3/1 and 0.2 mL trifluoroacetic acid (TFA) and hydrogenated under hydrogen (1 atmosphere; Parr Shaker apparatus) at 25 °C in the presence of 100 mg palladium (10% > on charcoal). After 3 hours, the catalyst was filtered off and the solvent was evaporated to yield the intermediate amine as an oily residue.
- TFA trifluoroacetic acid
- Step ii The above formed intermediate amine compound (200 mg; 0.5 mmol), 3,5- dimethylpyrazol-1-carboxamidine nitrate (DPFN) (170 mg; 0.8 mmol; Aldrich Chemical
- the starting material 2-N-BOC-amino-3-(4-hydroxy-phenyl)propionate was obtained via esterification of (D or L), N-(tert-butoxycarbonyl)-L(D)-tyrosine (t-Boc-L(D)-tyrosine) (1.0 equivalents; Sigma) in 0.10 M methanol and dilute 1%> HCl.
- the reaction mixture was stirred at 25 °C for 12 hours and then neutralized via potassium carbonate and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX with brine and dried over magnesium sulfate.
- the solvent was then removed in vacuo and the crude product was then purified by silica gel column chromatography to obtain 2-N-BOC-amino-3-(4-hydroxy-phenyl)propionate.
- reaction mixture was stirred at 0°C for 6 hours and then quenched with water (5 equivalents) and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX with brine and dried over magnesium sulfate. The solvent was then removed in vacuo and the crude product was then purified by silica gel column chromatography to obtain 3-p-N-BOC-amidino-phenyl-5-methanesulfonyloxy- methy 1 -2-oxazol idinone .
- the starting material 2-N-butylsulfonylamino-3-(4-hydroxy-phenyl)propionate was obtained via esterification of ((D or L) tyrosine) (1.0 equivalents; Sigma) in 0.10 M methanol and dilute 1%> HCl.
- the reaction mixture was stirred at 25 °C for 12 hours and then neutralized via potassium carbonate and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX with brine and dried over magnesium sulfate.
- the solvent was then removed in vacuo and the crude product was then carried on as follows:
- reaction mixture was stirred at 0°C for 6 hours and then quenched with water (5 equivalents) and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX with brine and dried over magnesium sulfate. The solvent was then removed in vacuo and the crude product was then purified by silica gel column chromatography to obtain 3-p-N-BOC-amidino-phenyl-5-methanesulfonyloxy- methyl-2-oxazolidinone.
- the starting material 2-N-propyl-sulfonylamino-3-(4-hydroxy-phenyl)propionate was obtained via esterification of ((D or L) tyrosine) (1.0 equivalents; Sigma) in 0.10 M methanol and dilute 1% HCl.
- the reaction mixture was stirred at 25 °C for 12 hours and then neutralized via potassium carbonate and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX brine and dried over magnesium sulfate.
- the solvent was then removed in vacuo and the crude product was then carried on as follows:
- reaction mixture was stirred at 0°C for 6 hours and then quenched with water (5 equivalents) and then diluted with ethyl acetate (0.10 M) and washed 2X with water, IX with brine and dried over magnesium sulfate. The solvent was then removed in vacuo and the crude product was then purified by silica gel column chromatography to obtain 3-p-N-BOC-amidino-phenyl-5-methanesulfonyloxy- methyl-2-oxazolidinone.
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Abstract
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PCT/US1997/009099 WO1997045447A1 (fr) | 1996-05-31 | 1997-05-30 | PROCEDES ET COMPOSITIONS SERVANT A L'INHIBITION DE L'ANGIOGENESE LIEE A LA PRESENCE DE αvβ¿5? |
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EP97927814A Withdrawn EP0907661A4 (fr) | 1996-05-31 | 1997-05-30 | PROCEDES ET COMPOSITIONS SERVANT A L'INHIBITION DE L'ANGIOGENESE LIEE A LA PRESENCE DE alpha v beta 5 |
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WO1995028426A2 (fr) * | 1994-04-13 | 1995-10-26 | La Jolla Cancer Research Foundation | Peptide limitant ou empechant la resorption osseuse, l'angiogenese et la restenose |
WO1997014716A1 (fr) * | 1995-10-18 | 1997-04-24 | MERCK Patent Gesellschaft mit beschränkter Haftung | Derives cyclopeptidiques |
EP0770622A2 (fr) * | 1995-09-15 | 1997-05-02 | MERCK PATENT GmbH | Inhibiteurs cycliques de l'adhésion |
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1997
- 1997-05-30 CZ CZ983800A patent/CZ380098A3/cs unknown
- 1997-05-30 WO PCT/US1997/009158 patent/WO1997045137A1/fr not_active Application Discontinuation
- 1997-05-30 WO PCT/US1997/009099 patent/WO1997045447A1/fr not_active Application Discontinuation
- 1997-05-30 AT AT97928698T patent/ATE470450T1/de active
- 1997-05-30 HU HU9902099A patent/HUP9902099A3/hu unknown
- 1997-05-30 KR KR1019980709874A patent/KR20000016301A/ko not_active Application Discontinuation
- 1997-05-30 CN CN97196818A patent/CN1226254A/zh active Pending
- 1997-05-30 JP JP54291497A patent/JP2002515036A/ja not_active Abandoned
- 1997-05-30 DE DE69739907T patent/DE69739907D1/de not_active Expired - Lifetime
- 1997-05-30 PL PL97330240A patent/PL330240A1/xx unknown
- 1997-05-30 PL PL97330241A patent/PL330241A1/xx unknown
- 1997-05-30 CZ CZ983834A patent/CZ383498A3/cs unknown
- 1997-05-30 EP EP97928698A patent/EP0951295B1/fr not_active Expired - Lifetime
- 1997-05-30 DK DK97928698.6T patent/DK0951295T3/da active
- 1997-05-30 EP EP97927814A patent/EP0907661A4/fr not_active Withdrawn
- 1997-05-30 CA CA002256588A patent/CA2256588A1/fr not_active Abandoned
- 1997-05-30 CA CA2256543A patent/CA2256543C/fr not_active Expired - Fee Related
- 1997-05-30 HU HU9901628A patent/HUP9901628A3/hu unknown
- 1997-05-30 KR KR1019980709875A patent/KR20000016302A/ko not_active Application Discontinuation
- 1997-05-30 BR BR9709514A patent/BR9709514A/pt not_active IP Right Cessation
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1998
- 1998-11-27 NO NO985574A patent/NO985574L/no not_active Application Discontinuation
- 1998-11-27 NO NO985575A patent/NO985575L/no not_active Application Discontinuation
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WO1995028426A2 (fr) * | 1994-04-13 | 1995-10-26 | La Jolla Cancer Research Foundation | Peptide limitant ou empechant la resorption osseuse, l'angiogenese et la restenose |
EP0770622A2 (fr) * | 1995-09-15 | 1997-05-02 | MERCK PATENT GmbH | Inhibiteurs cycliques de l'adhésion |
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CHEMICAL ABSTRACTS, vol. 125, no. 1, 1 July 1996 (1996-07-01) Columbus, Ohio, US; abstract no. 7248, R A CLARK ET AL.: "Transient functional expression of alpha.v.beta.3 on vascular cells during wound repair" XP002138525 & AM. J. PATHOL., vol. 148, no. 5, May 1996 (1996-05), pages 1407-1421, * |
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See also references of WO9745447A1 * |
Also Published As
Publication number | Publication date |
---|---|
NO985574L (no) | 1999-02-01 |
KR20000016302A (ko) | 2000-03-25 |
NO985574D0 (no) | 1998-11-27 |
HUP9901628A3 (en) | 2002-11-28 |
CN1226254A (zh) | 1999-08-18 |
EP0907661A4 (fr) | 2000-07-26 |
CA2256543C (fr) | 2010-12-07 |
PL330240A1 (en) | 1999-05-10 |
EP0951295B1 (fr) | 2010-06-09 |
WO1997045447A1 (fr) | 1997-12-04 |
HUP9902099A2 (hu) | 1999-09-28 |
NO985575L (no) | 1999-02-01 |
WO1997045137A8 (fr) | 2001-02-01 |
CZ380098A3 (cs) | 1999-05-12 |
CA2256588A1 (fr) | 1997-12-04 |
BR9709514A (pt) | 1999-08-10 |
EP0951295A4 (fr) | 2000-07-26 |
ATE470450T1 (de) | 2010-06-15 |
HUP9901628A2 (hu) | 1999-08-30 |
WO1997045137A1 (fr) | 1997-12-04 |
DK0951295T3 (da) | 2010-09-13 |
JP2002515036A (ja) | 2002-05-21 |
PL330241A1 (en) | 1999-05-10 |
HUP9902099A3 (en) | 2001-10-29 |
EP0951295A1 (fr) | 1999-10-27 |
KR20000016301A (ko) | 2000-03-25 |
CZ383498A3 (cs) | 1999-05-12 |
NO985575D0 (no) | 1998-11-27 |
DE69739907D1 (de) | 2010-07-22 |
CA2256543A1 (fr) | 1997-12-04 |
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