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- W1538948795 abstract "The action of phospholipases A2 and C in the course of collagen-stimulated platelet activation and the effect of cytochalasins on the responses were studied. Stimulation of human platelets with collagen was accompanied by aggregation, Ca2+ mobilization, inositol phosphate formation, and arachidonic acid release. However, in the presence of a cyclooxygenase inhibitor or a thromboxane A2 (TXA2) receptor antagonist, collagen induced only weak arachidonic acid release and weak inositol phosphate formation. The TXA2 mimetic agonist U46619 induced all the responses except for arachidonic acid release, which was induced by synergistic action of collagen and U46619. The result that U46619 did not induce arachidonic acid release despite the activation of phospholipase C suggested that arachidonic acid was not released via phospholipase C but by phospholipase A2. These findings suggested that collagen initially induced weak activation of phospholipases A2 and C and that further activation of phospholipase C as well as Ca2+ mobilization and aggregation were induced by TXA2, whereas further activation of phospholipase A2 required the synergistic action of collagen and TXA2. Platelets pretreated with cytochalasins did not respond to collagen. Further analysis revealed that the initial activation of phospholipases A2 and C was specifically inhibited by cytochalasins, but the responses induced by U46619 or a synergistic action of collagen and U46619 were not inhibited. Therefore, we proposed that interaction of collagen receptor with actin filaments might have some roles in the collagen-induced initial activation of phospholipases." @default.
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- W1538948795 date "1989-04-01" @default.
- W1538948795 modified "2023-09-29" @default.
- W1538948795 title "Possible Involvement of Cytoskeleton in Collagen-stimulated Activation of Phospholipases in Human Platelets" @default.
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- W1538948795 doi "https://doi.org/10.1016/s0021-9258(18)83559-1" @default.
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