MONOCLONAL ANTIBODY ANTI alpha v-INTEGRIN AND ITS USE TO INHIBIT alpha v beta 6-INTEGRIN ATTACHMENT TO FIBRONECTIN

Abstract: The invention relates to a novel monoclonal antibody and a hybridoma cell line producing said antibody. The monoclonal antibody, a preferred embodiment of which is named 14D9.F8, has the following properties: reacting only with the alpha v-chain of human alpha v-integrins, and inhibiting selectively the attachment to the integrin substrate fibronectin of the alpha v beta 6-integrin bearing cell.

Description: MONOCLONAL ANTIBODY ANΗ αv-INTEGRIN AND ITS USE TO INHIBIT αv/?6-INTEGRIN ATTACHMENT TO FIBRONECTIN TECHNICAL FIELD OF THE INVENTION The invention relates to a novel monoclonal antibody and a hybridoma cell line producing said antibody. The monoclonal antibody, a preferred embodiment of which is named 14D9.F8, has the following properties: reacting only with the αv-chain of human αv-integrins and inhibiting selectively the attachment to the integrin substrate of the αvβ6-integrin bearing cell. Object of the invention is, therefore, a monoclonal antibody having said properties. In addition, object of the invention is a monoclonal antibody producing hybridoma cell line having the designation 271.14D9.F8 and deposited under accession number DS ACC2331 , as well as a monoclonal antibody having the properties given above and which is obtainable by said hybridoma cell line. Object of the invention is, finally, a pharmaceutical composition comprising an antibody as defined above. BACKGROUND OF THE INVENTION Integrins are a super-family of cell surface adhesion receptors which control the attachment of cells with the solid extracellular environment - both to the extracellular matrix (ECM), and to other cells. Adhesion is of fundamental importance to a cell; it provides anchorage, cues for migration, and signals for growth and differentiation, integrins are directly involved in numerous normal and pathological conditions, and as such are primary targets for therapeutic intervention. Integrins are integral transmembrane proteins, heterodimers, whose binding specificity depends on which of some 15 α-chains is combined with which of some 8 β-chaiπs. The integrins are classified in four overlapping subfamilies, containing the β1 , U2, β3 or αv chains, and a particular cell may express several different integrins from each subfamily. The last decade has shown that integrins are major receptors involved in cell adhesion. Reports concerning integrins are given, for example, by E. Ruoslahti ( J. Clin. invest, 1991 , 87) and R. 0. Hynes (Cell, 1992, 69), and so may be a suitable target for therapeutic intervention. Excepting erythrocytes, all human cells express one or more integrins. Their functions are regulated at many levels, but primarily, their ligand specificity depends on which α-chain associates with which β- chain in the heterodimer and on the activation state of the integrins (Hynes, 1992; Diamond and Springer, 1994). The cellular background in which the integrins operate (Chan and Hemler, 1993), and the splice-variant form of the integrin which is used (Delwel et al., 1993) may also affect specificity. Given these complexities, one of The history of integrin research has shown that reagents that can specifically block integrin function are decisive factors in functional analysis, from the function blocking CSAT-antibody, which first defined an integrin β1 -chain (Neff et al., 1982), to the numerous vital later examples (eg. P1 D6, P1 B5(Wayner and Carter, 1987), P4C10 (Carter et al., 1990), and LM609 (Cheresh and Spiro, 1987)): the field is absolutely dependent on such reagents. The αv-series integrins are now seen to be a major subfamily, with both classical, and novel functions. As well as classically mediating ceil attachment and spreading (Pytela et al., 1985; Cheresh, 1991), α v integrins have also been implicated in cell locomotion (Seftor et al., 1992), in receptor intemalization (Panetti and McKeown Longo, 1993a; Panetti and McKeown Longo, 1993b), as virus co-receptors (Wickham et al., 1993), in management of the extracellular protease cascades (de Boer et al., 1993), and as regulators of tumor progression (Felding-Habermann et al., 1992). The specificities of the five known αv-series integrins, αvβl (Zhang et al., 1993), -β3 (Pytela et al., 1985; Cheresh et al., 1987), -β5 (Cheresh et al., 1989), -β6 (Busk et al., 1992) and -β8 (Moyle et al., 1991), have been partly defined, and they seem to exclusively recognize ligands bearing the RGD- (NH2-arginine-glycine-aspartic acid- COOH) tripeptide sequences, including those in vitronectin (αvβl , αvβ3, αvβ5), fibronectin (αvβl , αvβ3, αvβ5, αvβθ), and von Willebrand factor, fibrinogen, and osteopontin (αvβ3) (e.g. 1991 ; Busk et al., 1992; Zhang et al., 1993; Denhardt and Guo, 1993; Smith and Cheresh, 1990;). -4- It is known that αv β 3 and αvβ5 are involved in tumor angiogenesis, while αv β 6 is a co-stimulator of colon carcinoma cell proliferation and is up-regulated during inflammatory epithelial proliferation and epithelia carcinogenesis (Breuss et al., J. Ceil. Sci. 108:2241-2251 , 1995). Its expression seems to mark neo-hyperproliferative epithelia. (Zambruno et al. J. Cell. Biol. 129, 853-865 (1995)). Integrin over- expression can produce a psoriasis-like model condition. Specific antagonists and agonists of αvβ6-integrins may thus have wide therapeutic potential. RGD-peptides block αvβ6 binding to fibronectin, but they also block other cell surface fibronectin receptors, including α5β1 (Pytela, R. et al. Cell (1985) 40, 191-198) and αvβ3 (Pytela, R.Proc. Natl. Acad. Sci. USA 82, 5766-70 (1985)). Inhibitory antibodies have been described that target all αv integrins (Lehmann et al., Cancer Res. 54, 2102-2107 (1994)) and the αvβ3 or αvβ5 complexes (Weinacker et al., J. Biol.Chem. 269, 6940-6948 (1994)), but no reagent is known to selectively inhibit αvβ6. It has been previously described a series of antibodies that bind human integrin αv-chains including the „non-inhibitory" Mab 14D9.F8 (Mitjans et al., J. Cell. Sci. 108, 2825-2838 (1995)). This invention provides a novel monoclonal antibody reacting only with the αv- integrin chain of human αv-integrins and blocking selectively the attachment to the integrin substrate of the αv β 3 and α vβ6-integrin bearing cell, which is designated 14D9.F8. GENERAL, MATERIALS, FIGURES, TABLES Purification and sources of proteins, cell lines and their culture, ELISA, adhesion assays, FACS analysis and the production and characterisation of the antibodies used have been described in detail elsewhere (Mitjans, F. et al, J. Cell Sci. 108, 2825-2838 (1995)). The Mabs 14D9.F8, 11D1 and 17E6 were purified from serum-free hybridoma supematants by protein-A affinity chromatography followed by removal of endotoxins and were > 99% pure by SDS- PAGE (Mitjans, F. et al. J. Cell. Sci. 108, 2825-2838(1995)). Mouse monoclonal 11D1 is an Igd is directed against integrin β5. Molecular mass of 155 KDa is assumed for murine IgG. The preparation of transmembrane truncated recombinant αvβ6 was essentially as described in Weinacker, A. et al. J. Biol. Chem. 269, 6940-48 (1994). P3D10 (Agrez, M. et al. J. Cell. Biol. 127, 547-556 (1994)), E. Wayner (University of Minnesota, Minneapolis), and 4B7, J. Marshall (IRCF, London) were generous gifts. The antibody selectivity of the antibodies used is summarized in Tab. 1 and the integrin profile of the cell lines used is summarized in Tab. 2. The cell line was deposited under accession number DSM ACC2331 at the Deutsche Sammlung fur Mikroorganismen, Braunschweig, FRG. The DNA- and amino acid sequences include also slightly varied or altered sequences such as mutants and variants which can be obtained intentionally or randomly by chemical or physical processes. Generally, all such mutants and variants are included which show the described properties and functions. - 6 - The term antibody includes also, as a rule, antibody fragments such as Fab', F(ab')2 or single-chain Fvs. These fragments can be produced by usual standard techniques Table 1 The derivation and characterisation of these antibodies is defined in the cited literature, and in this description. Table 2 The integrin expression profiles of these lines has been defined by surface labelling and FACS anaylsis or immunoprecipitation.(FACS= Fluorescence Activated Cell Sorter) Figure 1 Mab 14D9.F8 binds v-integrin chains in several contexts: Recombinant soluble αvβ3 (A), piacental αvβ5 (B), recombinant soluble αvβ6 (C), and platelet αllbβ3 (D) (all at 1 μg ml "1 ) were absorbed to 96-well ELISA plates and probed with the indicated concentrations of Mabs 14D9.F8 (solid squares), 17E6 (solid circles), 4B7 (solid triangles up), 11D1 (solid triangles down), AP3 (solid diamonds), E7P6 (open circles) was used as hybridoma supernatant, the 5 μg/ml point representing a supernatant dilution of 1 :5. Bound antibody was detected with peroxidase-conjugated anti-mouse IgG. Error Bars = SD (π=3) Figure 2 Mab 14D9.F8 inhibits cell adhesion to fibronectin but not to vitronectin: - ~ - HT-29 colon carcinoma (A,B), UCLA-P3 lung carcinoma (C,D), WM- 164 melanoma (E,F) were allowed to attach to plates coated form 5 μg ml "1 solutions of fibronectin (A,C,E) or vitronectin (B,D,F) in the presence of the indicated concentrations of Mabs 14D9.F8 (solid squares), 17E6 (solid circles), P1F6 (solid triangles down), P4C10 (solid triangles up), LM 609 (solid diamond). After 1 h unbound cells were washed away, and attached cells detected by estimating lysozomal hexosaminidase. Attachment has been normalized using maximum cells attached as 100%. Actual cell attachments on fibronectin and vitronectin respectively were HT-29 (27%, 53%), UCLA-P3 (42%, 64%), WM 164 (84%, 50%). Error Bars = SD (n=3) Figure 3 Mab 14D9.F3 selectively acts on the vβ6 integrin. SW480 cells mock transfected (mock) or transfected with full-length human β6 integrin (Beta-6), were allowed to attach to plates coated with fibronectin (FN) or vitronectin (VN) for 1 h in the presence of 10 μ g ml "1 antibodies as described in Fig.2. Error Bars = SD (n=3) References 1. Weinacker.A., Chen, A., Agrez, M., Cone, R. I. Nishimura.S., Wayner, E., Pytela, R., and Sheppard, D. (1994) J. Biol. Chem. 269, 6940-6948 2. Agrez, M., Chen, A., Cone, R. I., Pytela, R., and Sheppard, D. (1994) J. Cell Biol. 127, 547-556 - 8 - 3. Mitjans, F., Sander, D., Adan, J., SutterA, Marinez, J. M. , Jaggle, C, Moyano, J., Kreysch, H.-G., Piulats, J., and Goodman, S.L. (1995) J. Cell Sci. 108, 2825-2838 4. Cheresh, D. A. and Spiro, R.C. (1987) J. Biol. Chem. 262, 17703- 17711 5. Houghton, A. N., Eisinger, M. Albino, A. P., Cairncross, J.G., and Old, LJ. (1982) J. EXP. MED. 156, 1755-1766 6. Carter, W., Wayner, E., Bouchard, T., and Kaur, P. (1990) J. Cell Sci. 110, 1387-1404 7. Furihata, K., Nugent, D. J., Bissonette, A., Aster, R. H., and Kunicki, T. J. (1987) J. Clin. Invest. 80, 1624-1630 8. Ebert, E. C. (1996) Dig. Dis. Sci. 41 , 1551-1556 9. Koretz, K. Bruderiein, S. Henne, C, Fietz, T., Laque, M., and Moller, P. (1994) Virchows Arch. 425, 229-236 - 9 - DETAILED DESCRIPTION The monoclonal antibody 14D9.F8 binds strongly to αvβl , αvβ3, αvβ5 and αvβ6 integrins. In ELISA on purified human integrins, 14D9.F8 and 17E6 showed identical reaction profiles and simiiiar concentrations of antibodies were needed to obtain 50% maximal binding (Fig.1). 14D9.F8 did not react with αllbβ3, indicating that it was targetting the αv-chain, as it has been previously concluded from a FACS analysis (Mitjans, F. et al., J. Cell Sci. 108, 2825-2838 (1995)). 14D9.F8 had little effect on cell attachment mediated by αvβ5, and weak-to-moderate effects on the attachment mediated by αvβ3 and αvβl (Mitjans, F. et al., J. Cell Sci. 108, 2825-2838 (1995)). However, when it has been tested 14D9.F8 for its ability to affect cell attachment of HT-29 and UCLA-P3 carcinoma cells to fibronectin, it has been shown that it was extremely active. (Fig. 2) 14D9.F8 abolished HT-29 cell adhesion to fibronectin with an IC50 of some 0.3 nM while on vitronectin up to 600 nM it was, rather, stimulatory. The reason for this is not clear. The binding of HT-29 to vitronectin was entirely inhibited by P1 F6, and to fibronectin was insensitive to P1 F6 but was abolished by 17E6. LM609 did not react with HT-29 or UCLA.P3 cells (Mitjans, F. et al., J. Cell Sci. 108, 2825- 2838 (1995)) and had no effect on their attachment to vitronectin or fibronectin (Fig. 2A, B). Thus, an αv-integrin but not αvβ3 or αvβ5 modulates HT-29 adhesion to fibronectin, and this integrin is selectively blocked by Mab 14D9.F8, while the integrins mediating adhesion to vitronectin are inactivated by Mab P1F6 and this integrin is weakly inhibited by 14D9.F8. - 10 - To demonstrate that it was not a peculiarity of HT-29 cells, the inhibition experiments were repeated using UCLA-P3, a carcinoma ceil from a different source, lung, which express high levels of αvβ5 and αvβ6 and obtained simiiiar results (Fig. 2 C,D). Mab 14D9.F8 abolished cell adhesion to fibronectin, adhesion mediated mainly by 17E6-sensitive molecuies-with some contribution of P4C10-sensitive molecules (presumably αvβ5 or αvβl). On vitronectin 14D9.F8 inhibited up to 30% of cell attachment, but P1F6 abolished it. If, as believed, P1 F6 is selective for αvβ5 (Weinacker et al., J. Biol. Chem. 269, 6940-6948 (1994)), these data suggest that the integrin on UCLA-P3 mediating attachment to fibronectin is αvβ5, and this molecule is inhibited by 17E6 some 4 orders of magnitude strongly than by 14D9.F8. As in ELISA and FACS 17E6 and 14D9.F8 bind αvβ3, αvβ5 and αvβ6 with very simiiiar concentration dependency. This is an unexpected finding. Melanoma cell lines uniformly express αvβ5, αvβ3 or αvβl , but no αvβ6 or αvβ8 (Marshall, J.F. et al. Semin. Cancer Biol. 7, 129-138 (1996)). As shown in Fig. 2.E,F, on WM164 melanoma cells, attachment to fibronectin was insensitive to αv-inhibitors, while attachment to vitronectin was blocked by 17E6, and some 50% by 14D9.F8 and up to 80% by LM609. Addition of P1F6 to LM609 or 14D9.F8 completely inhibits WM164 attchment to vitronectin. This indicated this attachment was mediated by both LM609 and P1F6- sensitive molecules, and that the LM609, but not the P1F6, sensitive target was also inhibited by 14D9.F8. -11- Many carcinoma cell express αvβ6 (Sheppard, D. (1996) Bioessays 18, 655-660). It was hypothesised that the carcinoma cell adhesion to fibronectin was mediated largely by αvβ6, and that 14D9.F8 was selectively inhibiting this molecule, while not inhibiting αvβ3 and αvβ5. To confirm this, it was measured the attachment of the SW480 cell line, transfected with full-length human β6, in the presence of 14D9.F8: On fibronectin, the SW480-β6-transfectants were little affected by P3D10, while 14D9.F8, 17E6 and L230 were all potent inhibitors of attachment (Fig.3A). However, the attachment of the mock transfected SW480 on fibronectin, where they exclusively use α5β1 as adhesion receptor, could be strongly blocked using Mab P3D10 (Fig. 3B) (Weinacker, A. et al. J. Biol. Chem. 269, 6940-6948 (1994)) and 17E6, L230, and 14D9.F8 had only slight additional activity, possibly due to inhibition of αvβl (Marshall, J.F. et al. J. Cell Sci. 108, 1227-1238 (1995)). Once again, on vitronectin, cell adhesion was inhibited strongly by P1F6 and 17E6, but was unaffected by 14D9.F8 (Fig. 3C). Together, these data show that 14D9.F8 selectively inhibits αvβδ and αvβ3 more strongly than αvβl , and does not affect αvβ5, although it ligates all of these integrins strongly. The molecular details of this process are unknown, but a common interpretation of the data is that substantial alterations in integrin conformation occurs following ligand binding (Schwartz, M.A. et al. Ann. Rev. Cell Dev. Biol. 11 , 549-599 (1995)). It is therefore favoured -12- ** ) the possibility that when 14D9.F8 is bound to the αv-chain of αvβ6 and αvβ3 it prevents a motion of the β-chains against the αv-chain which is necessary to allow ligand binding. Sequence comparison shows potential sequences that show the necessary conservation between β3 and β6, and vary in β5 that could be involved 10 (unpublished observations). THERAPEUTIC AND DIAGNOSTIC USE The antibody according to the invention can be administered to human patients for therapy. Therefore, it is an object of the invention to provide a pharmaceutical formulation comprising as active ingredient at least one antibody or antibody fragment as defined above and in the claims, associated with one or more pharmaceutically acceptable carrier, excipient or diluent therefore. Typically the antibody of this invention will be injected intravenously or parenterally. Generally, the dosage ranges for the administration of 20 the antibody (or fragments thereof) are large enough to produce the desired tumor suppressing and tumor lysing effect. The dosage will depend on age, condition, sex and extent of the disease in the patient and can vary from 0.1 mg/kg to 200 mg/kg, preferably from 0.1 mg/kg to 100 mg/kg/dose in one or more doses administered daily, for one 25 or several days. Preparations for parenteral administration includes sterile aqueous or non-aqueous solutions, suspensions, and emulsions. Examples of non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oils such as olive oils, and injectable organic esters such as ethyl oleate and other solvents known in the art which are suitable -13- or these purposes. The antibodies of this invention can be used in a composition comprising a physiologically acceptable carrier. Examples of such suitable carriers are saline, PBS, Ringer's solution, or lactated Ringer's solution. Preservatives and other additives such as antibiotics, antioxidants, and chelating agents may also be present in the pharmaceutical formulations. The antibody (or a fragment thereof) can also be conjugated according to known methods to cytokines such as lL-2 in order to support their cytotoxicity. The pharmaceutical formulations of the present invention are suitable for the treatment of carcinomas. For diagnostic purposes the antibody can be conjugated, for example, to a radio-opaque dye or can be radioiabelled. A preferred labelling method is the lodogen method. Preferably the antibody will be administered as or scFv fragments for diagnostic purposes. This provides superior results so that background substraction is unnecessary. -14- EXAMPLES Example 1: Materials Animals Mice for antibody production (female BALB/c; 8 weeks old) and for tumor models ("nude mice": female homozygotic athymic BALB/c nu/nu; 4-5 weeks old) were from Criffa (Barcelona, Spain). Nude mice were maintained in a sterile room in micro-isolator cages, and were given sterilized food and water ad libitum. All manipulations were performed in a laminar flow hood. Proteins: Fibronectin (Ruoslahti et al., 1982), vitronectin (Yatohgo et al., 1988) were purified from fresh frozen human plasma. Where not otherwise stated, all manipulations were at 20°C, and ail washings were with calcium-magnesium free PBS ("PBS": 137mM NaCI, 2.8mM KCI, 8.1mM Na2HPθ4, 1.5mM KH2PO4; pH7.4). PBS++ is PBS with added 1mM MgCl2 and 1mM CaCl2. Where not specifically stated, chemicals (Merck KGaA, Darmstadt) were of highest available purity. Cyclic peptides like RGDfV were synthesized according to known standard techniques (e.g. FEBS Let. 291 , p. 50- 54, 1991). Tumor cell lines and cultures- American Type Culture Collection (ATCC) supplied HT29 human carcinomas, the UCLA-P3 human lung adenocarcinoma (Cheresh et al., 1989) (Dr. D.A. Cheresh; Scripps), and WM164 melanoma (Dr. M. Herlyn; Wistar) (Herlyn et al., 1990). All cells were cultured at 37°C in 7.5% CO2 92.5% air in 90% RPMI 1640, 10% fetal calf serum (FCS) plus 2mM L-glutamine, and were consistently free of mycoplasma as evaluated by a proprietary test (Mycotect Kit; Gibco). -15- Antibodies- Monoclonal antibody (MAb) fusions, ELISA screening, subcloning and maintenance of cultures were all performed using standard technologies (Hariow and Lane, 1988) unless otherwise specified. Example 2: Immunization MAbs against the αvβ3 were produced by intraperitoneal (ip) injection of purified placental αvβ3 immobilized on Sepharose (80 μg αv β 3 on 80 μl Sepharose in 200 μl PBS) or of live M21 cells (1x10 6 cells in 0.5ml PBS) every two weeks over twelve weeks. Four days after the last injection, PEG-induced fusion was performed using Friendly Myeloma (Ventrex) as partner. Antibodies to a 200kDa melanoma-associated surface protein were produced by immunising intact M21 cells (1x10 6 cells in 0.5ml PBS). Screening ELISA on receptors and on fixed M21 cells were used. For receptor ELISA, 96-well ELISA plates (Dynatech) were coated with purified αvβ3 (1 μg/ml in PBS, 16h;4°C), blocked (1.5% skimmed milk in PBS; 1h;4 °C) and incubated with hybridoma supematants. Bound immunoglobulins were detected with alkaline-phosphatase conjugate anti-mouse Ig (Dako) using p-nitrophenyl-phosphate as substrate. For cellular ELISA, UCLAP-3 cells on 96-well tissue culture plates were fixed (4% paraformaldehyde in PBS, 15 min. 20°C) and blocked (3% BSA, PBS; 1h;4 °C) before incubation with hybridoma supematants and detection as in receptor ELISA. Positive hybrids were subcloned three times by limiting dilution and adapted to RPMI medium. Immunoglobulin isotype was determined using subclass-specific heavy-chain antibodies (Zymed) or light-chains antibodies (Promega). - 16 - Other murine MAbs used in the studies were the gift of our colleagues LM609 to αv β 3, P4C10 to β 1 integrin (Carter et al., 1990) (Telios) and AP3 to the β3 chain (Furihata et al., 1987) (ATCC). Example 3: Antibody Purification and Scaling; Up- For large scale purification, antibody supematants were harvested from exponential phase cultures grown in roller bottles. The antibodies purified on protein A- Sepharose CL-4B (Pharmacia) were dialysed against PBS before sterile filtration (0.45 μm) and storage at -70 °C (Hariow and Lane, 1988). Purified antibodies were freed of endotoxins by passage over Kurimover-ll columns (Kurita-Vater; Tokyo). This reduced the endotoxin levels from >250 IU endotoxin mg- '1 antibody to < 0.2 IU mg -"1 in the Limulus assay (Melvaer and Fystro, 1982). F(ab')2 and F(ab)' fragments of 17E6 (murine lgG-|) were prepared by standard techniques of pepsin clevage and separation on protein-A columns (Pharmacia), followed by papain clevage and separation by gel filtration (Hariow and Lane, 1988). Integrin purifications αvβ5 was purified from human placenta (Smith and Cheresh, 1988). Term placenta was minced and washed in ~2vois ice cold solution A (0.05% w/v digitonin, 2mM CaCl2,2mM PMSF, pH7.4), then filtered . The retained material was extracted in ~4vols ice cold buffer B (100mM octyl-β-D-glucopyranoside [OG], 1mM CaC^, 2mM PMSF, in PBS ) and centrifuged (12000gmax, 45min; 4 °C). The supernatant was re-circulated over a P3D10 column (16h;4 °C). After washing with buffer C (0.1% NP-40 in PBS; -10 cv) and buffer D (0.1% NP- 40, 2mM CaCl2, 10mM Na-acetate; pH 4.5 :~10cv), bound material was eluted with buffer E (buffer D adjusted to pH 3.1). The eluant was neutralized with 3M Tris (pH 8.8), dialysed against buffer C, and concentrated ~10x using Aquacide II (Calbiochem). The purified receptors were stored at -70 °C. Recombinant α v β 3 and α v β δ were purified from baculovirus infected High five cells by affinity chromatography on LM609 (α v β3) and 17E6 (α v β6), with elution, concentration and storage as far α v βs. α llb β 3 was prepared from human platelets (Pytela et al., 1986). Outdated platelet concentrates were mixed with one volume of Tyrodes buffer, pelleted (1200gmax) and the pellet extracted (1h;20 ° C) with lysis buffer (50mM OG, 1mM MgCl2, 1mM CaCl2, 1μM MnCl2, 2mM PMSF, 150mM NaCI, 50mM Tris-HCI; pH 7.4). After centrifugation (32000gmax , 30min; 4 °C) the supernatant was recirculated (16h; 4 °C) over a GRGDSPK-conjugated CL-4B Sepharose column. The column was washed with lysis buffer (~10cv) and eluted with the GRGDSPK (3mg ml "1 in 90% lysis buffer, 10% DMSO). The peak was concentrated ~5-fold , dialysed against modified lysis buffer (0.1% NP-40 substituted for OG) and stored at - 70°C. The integrin preparations were ~ 95% pure as judged by anti- integrin ELISA using α-and β-chain specific monoclonal antibodies and by SDS-PAGE. -18- Antibody Specificity Reference Binding I Inhibition 17E6 αv I αv (3) 14D9.F8 αv αvβό - αvβ3 > αvβ 1 (3) L230 αv ccv (5) P3D10 α5 α5 (2) P4C 10 β l 31 (6) 4B7 βl none λlarshalfpersonal communication) AP3 33 none 1 (7) 11D1 β5 none 1 this studv E7P6 1 β6 none 1 (1) LM609 i αvβ3 αvβ3 1 (4) P1F6 1 αvβ 5 αvβ5 1 (1) Table 1 Cell | Integrin αvβ3 vβ5 αvβό α5βl Reference (Binds * ) (V .F * ) (VN1 (ΕN) ! . UCLA-P3 - (1-3) HT-29 . : . (8.9) WM- 164 - 1 - - This study Table 2

Claims: - 19- - *** Patent Claims 1. Monoclonal antibody having the following properties: reacting only with the αv-chain of human αv-integrins, and - inhibiting selectively the attachment to the integrin 10 substrate fibronectin of the αvβδ-integrin bearing cell. 2. Monoclonal antibody of claim 1 , wherein the tumor, the cell growth of which is inhibited, is UCLA-P3 lung carcinoma cell. 3. Monoclonal antibody of claim 1 , wherein the tumor, the cell 15 growth of which is inhibited, is HT-29 colon carcinoma cell. 4. Monoclonal antibody fragment having the properties of the monoclonal antibody of claims 1 - 3. 20 5. Hybridoma cell line having the designation 271.14D9.F8 and deposited under accession number DSM ACC2331 capable of producing a monoclonal antibody of claims 1 - 3. 6. Monoclonal antibody obtainable by the hybridoma cell line DSM ACC2331. 25 7. Pharmaceutical composition comprising a monoclonal antibody according to one of the claims 1 - 4 or 6, and a pharmaceutically acceptable carrier. -20- 8. Method for the manufacture of a monoclonal antibody according to one of the claims 1 - 3, by immunizing a mouse with human tumor cell line M21. 9. Method for the manufacture of a monoclonal antibody of claim 6, by immunizing a mouse with M21 cell line, selecting clones binding to purified αv-integrins by ELISA and producing according to standard techniques the cell line as defined in claim 5 which produces said antibody. 10. Use of monoclonal antibody according to one of the claims 1 - 4 or 6, for the manufacture of a drug directed to tumors, preferably colon or lung carcinoma cell, or for the diagnostic location and assessment of tumor growth.

Inventors: CARCELLER ANA, DIEFENBACH BEATE, GOODMAN SIMON, MITJANS FRANCESC, ROSELL-VIVES ELISABET, CARCELLER, ANA, DIEFENBACH, BEATE, GOODMAN, SIMON, MITJANS, FRANCESC, ROSELL-VIVES, ELISABET
Applicants: CARCELLER ANA, DIEFENBACH BEATE, GOODMAN SIMON, MERCK PATENT GMBH, MITJANS FRANCESC, ROSELL VIVES ELISABET, CARCELLER, ANA, DIEFENBACH, BEATE, GOODMAN, SIMON, MITJANS, FRANCESC, ROSELL-VIVES, ELISABET
Application year: 1999
Main classification: C07K16
IPC codes: A61K38, A61K39, A61K49, A61K51, A61P35, C07K16, C12N5, C12N15, C12P21