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• W1569117848 startingPage "1740" @default.
• W1569117848 abstract "Tumor cell attachment to thrombospondin (TSP) in the extracellular matrix may be of critical importance in the processes of invasion and hematogenous dissemination. To determine the specific receptor systems that mediate the interaction of tumor cells with insoluble TSP, the attachment of HT1080 fibrosarcoma and C32 and G361 melanoma cells to TSP-coated discs was studied in the presence of heparin, Arg-Gly-Asp-Ser, or antibodies to glycoprotein (GP) IV (CD36, GPIIIb), a TSP receptor. HT1080 and C32 cell attachment to TSP was inhibited by the combination of heparin and a monoclonal (or polyclonal) antibody to GPIV but not by either alone. Heparin alone inhibited cell spreading. Neither control monoclonal antibodies nor the cell attachment peptide Arg-Gly-Asp-Ser inhibited tumor cell attachment to TSP, alone or in the presence of heparin. HT1080 cells attached equally as well to a 140-kDa proteolytic TSP fragment lacking the heparin-binding domain as to intact TSP. A monoclonal antibody to GPIV alone inhibited tumor cell attachment to the heparin-domainless 140-kDa TSP fragment. No attachment to the heparin-binding fragment was observed, but the addition of the heparin fragment to 140-kDa heparin-domainless TSP restored the heparin sensitivity of binding. G361 cells that lack GPIV attached well to TSP but were not inhibited by heparin or anti-GPIV alone or in combination. The combination of heparin and Arg-Gly-Asp-Ser inhibited G361 attachment to TSP. These studies suggest that tumor cells may utilize separate receptor systems in a cooperative manner to adhere to TSP. HT1080 fibrosarcoma and C32 melanoma cells utilize GPIV in concert with a heparin-modulated binding systems to attach and spread on TSP. G361 cells, which lack GPIV expression, attach and spread on TSP using an integrin system as well as a heparin-modulated system." @default.
• W1569117848 created "2016-06-24" @default.
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• W1569117848 date "1991-01-01" @default.
• W1569117848 modified "2023-10-16" @default.
• W1569117848 title "Cellular attachment to thrombospondin. Cooperative interactions between receptor systems" @default.
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• W1569117848 doi "https://doi.org/10.1016/s0021-9258(18)52358-9" @default.
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