1,2-Diacylglycerol and phorbol ester inhibit agonist-induced formation of inositol phosphates in human platelets: possible implications for negative feedback regulation of inositol phospholipid hydrolysis
- PMID: 2986126
- PMCID: PMC397616
- DOI: 10.1073/pnas.82.9.2623
1,2-Diacylglycerol and phorbol ester inhibit agonist-induced formation of inositol phosphates in human platelets: possible implications for negative feedback regulation of inositol phospholipid hydrolysis
Abstract
The present study has demonstrated that pretreatment of human platelets with either phorbol ester or 1,2-diacylglycerol inhibits agonist-induced formation of inositol phosphates; this inhibition can be correlated with a decrease in the release of ATP and 5-hydroxytryptamine by thrombin. The mechanism of this action is not known, but a role for protein kinase C is suggested, as both phorbol ester and 1,2-diacylglycerol have in common the ability to activate this enzyme. These results have important implications as a possible negative feedback control over agonist-induced hydrolysis of inositol phospholipids.
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