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- W1567820531 abstract "Osteopontin (OPN), a secreted phosphoprotein, has been implicated in various biological phenomena (e.g. bone development, sepsis, tumor progression, and metastasis). Its role in any context is poorly understood. OPN contains a conserved Gly-Arg-Gly-Asp-Ser (GRGDS) sequence, and binds to cells via integrin-mediated mechanisms. Using recombinant human osteopontin-glutathione S-transferase fusion protein and our improved hybridoma fusion partner (Sp2/mIL6), we raised murine monoclonal antibodies against osteopontin. We characterized two antibodies that recognize not only recombinant but also native human osteopontin. These antibodies do not cross-react with mouse osteopontin (recombinant protein or that secreted by ras-transformed NIH 3T3 cells), or bovine bone osteopontin, suggesting that they recognize epitopes unique to human OPN. One antibody specifically inhibited adhesion of MDA-MB-435 human breast cancer cells and ras-transformed NIH 3T3 cells to human osteopontin. This antibody failed to recognize osteopontin cleaved by thrombin, which cleaves adjacent to the cell binding domain. We previously showed that thrombin cleavage reduces osteopontin cell binding activity. Thus we postulate that this monoclonal antibody recognizes and interferes with the function of the RGD/thrombin cleavage region of human OPN." @default.
- W1567820531 created "2016-06-24" @default.
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- W1567820531 date "1994-09-01" @default.
- W1567820531 modified "2023-10-15" @default.
- W1567820531 title "Inhibition of Arg-Gly-Asp (RGD)-mediated cell adhesion to osteopontin by a monoclonal antibody against osteopontin." @default.
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- W1567820531 doi "https://doi.org/10.1016/s0021-9258(17)31650-2" @default.
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