Title : Synergistic potentiation of 5-hydroxytryptamine secretion by platelet agonists and phorbol myristate acetate despite inhibition of agonist-induced arachidonate/thromboxane and beta-thromboglobulin release and Ca2+ mobilization by phorbol myristate acetate.

Pub. Date : 1986 Aug 15

PMID : 2948494






3 Functional Relationships(s)
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1 With increasing times of incubation with PMA (10 s-5 min), the rise in [Ca2+]i induced by thrombin and the TxA2 mimetic, U46619, was increasingly inhibited (90-100% with 5 min incubation) and, correlating with this, thrombin-induced [3H]arachidonate, TxB2 and beta-thromboglobulin (beta TG) release were also inhibited. Tetradecanoylphorbol Acetate pro-platelet basic protein Homo sapiens
2 With increasing times of incubation with PMA (10 s-5 min), the rise in [Ca2+]i induced by thrombin and the TxA2 mimetic, U46619, was increasingly inhibited (90-100% with 5 min incubation) and, correlating with this, thrombin-induced [3H]arachidonate, TxB2 and beta-thromboglobulin (beta TG) release were also inhibited. Tetradecanoylphorbol Acetate pro-platelet basic protein Homo sapiens
3 The results indicate that, while PMA may cause an inhibition of agonist-induced [Ca2+]i mobilization resulting in an inhibition of agonist-induced arachidonate, TxB2 and beta TG release, its effects on agonist-induced 5HT secretion may be complicated by [Ca2+]i-independent synergistic effects of agonist and PMA. Tetradecanoylphorbol Acetate pro-platelet basic protein Homo sapiens