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• W1569353770 abstract "Fibrinogen binding to receptors on activated platelets is a prerequisite for platelet aggregation. However, the regions of fibrinogen interacting with these receptors have not been completely characterized. Fibronectin also binds to platelet fibrinogen receptors. Moreover, the amino acid sequence Arg-Gly-Asp-Ser, corresponding to the cell attachment site of fibronectin, is located near the carboxyl-terminal region of the alpha-chain of fibrinogen. We have examined the ability of this tetrapeptide to inhibit platelet aggregation and fibrinogen binding to activated platelets. Arg-Gly-Asp-Ser, but not the peptide Arg-Gly-Tyr-Ser-Leu-Gly, inhibited platelet aggregation stimulated by ADP, collagen, and gamma-thrombin without inhibiting platelet shape change or secretion. At a concentration of 60-80 microM, Arg-Gly-Asp-Ser inhibited the aggregation of ADP-stimulated gel-filtered platelets approximately equal to 50%. Arg-Gly-Asp-Ser, but not Arg-Gly-Tyr-Ser-Leu-Gly, also inhibited fibrinogen binding to ADP-stimulated platelets. This inhibition was competitive with a Ki of approximately equal to 25 microM but was incomplete even at higher tetrapeptide concentrations, indicating that Arg-Gly-Asp-Ser is a partial competitive inhibitor of fibrinogen binding. These data suggest that a region near the carboxyl-terminus of the alpha-chain of fibrinogen interacts with the fibrinogen receptor on activated platelets. The data also support the concept that the sequence Arg-Gly-Asp-Ser has been conserved for use in a variety of cellular adhesive processes." @default.
• W1569353770 created "2016-06-24" @default.
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• W1569353770 date "1985-10-01" @default.
• W1569353770 modified "2023-09-30" @default.
• W1569353770 title "The tetrapeptide analogue of the cell attachment site of fibronectin inhibits platelet aggregation and fibrinogen binding to activated platelets." @default.
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• W1569353770 doi "https://doi.org/10.1016/s0021-9258(17)38962-7" @default.
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