title: Synergistic stimulation of thromboxane biosynthesis by calcium ionophore and phorbol ester or thrombin in human platelets.
abstract: Phorbol ester PMA and low concentrations of calcium ionophore A-23187, which given separately have minimal effect in stimulating thromboxane synthesis in human platelets, showed marked synergism when given simultaneously. A similar synergism can be also demonstrated between thrombin or collagen and low concentrations of A-23187 but not of PMA. Simultaneous addition of thrombin and PMA results in less synthesis of thromboxane than that of thrombin alone. These studies suggest that protein kinase C activation by agonists may not only induce but also regulate thromboxane synthesis in human platelets.
mesh_terms: D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism*; D000001:Calcimycin / Q000494:pharmacology*; D003094:Collagen / Q000494:pharmacology; D004357:Drug Synergism; D006801:Humans; D010704:Phorbols / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D013917:Thrombin / Q000494:pharmacology*; D013929:Thromboxane B2 / Q000096:biosynthesis; D013931:Thromboxanes / Q000096:biosynthesis*
chemical_list: D010704:Phorbols; D013931:Thromboxanes; D000001:Calcimycin; D013929:Thromboxane B2; D003094:Collagen; D013917:Thrombin; D013755:Tetradecanoylphorbol Acetate