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• W2119372316 abstract "R59022 is an inhibitor of the enzyme 1,2-diacylglycerol (DAG) kinase, which, by inhibiting the conversion of DAG to phosphatidic acid, causes an increase in endogenous DAG levels and the activity of the DAG-dependent enzyme protein kinase C. This property of the drug was utilized in the present study to assess the role of DAG, i.e., its relative importance as a potentiatory versus inhibitory mediator, in agonist-induced platelet activation. The phosphorylation of the 40–47-kDa protein by protein kinase C was monitored as an indicator of endogenous DAG levels and correlated with other agonist-induced platelet responses such as platelet aggregation, 5-hydroxytryptamine (5HT) secretion and arachidonate release, the agonists used being those that induce DAG formation, e.g., thrombin and collagen. Pretreatment of platelets with R59022 before agonist addition resulted in the potentiation of 5HT secretion as well as 45 kDa protein phosphorylation induced by thrombin and the DAG analogue, 1,2-dioctanoylglycerol (DiC8). However, collagen-induced 5HT secretion was significantly inhibited (70%) in the presence of R59022, which also had strong inhibitory effects on aggregation induced by collagen, as well as by thrombin and DiC8. The inhibition of collagen-induced secretion by R59022 was in contrast to the potentiatory effects of DiC8 on the same, suggesting that even although DAG acts as a potentiatory signal in this system, the inhibitory effects of R59022 on collagen-induced aggregation can mask any effects of endogenous DAG. This inhibitory effect of R59022 on agonist-induced platelet aggregation makes it unsuitable as a tool in studying the role of DAG in platelet activation induced by agonists such as collagen as well as the ‘weak’ agonists (ADP, adrenaline and platelet-activating factor), where aggregation mediates other responses such as arachidonate release and secretion. Furthermore, potentiatory effects of R59022 on 5HT secretion induced by phorbol 12-myristate 13-acetate and ionomycin, which are effects unlikely to be related to inhibition of DAG kinase was observed, and these effects further underline the non-specificity in the actions of R59022 and its limitations as a tool in studying platelet stimulus-response coupling." @default.
• W2119372316 created "2016-06-24" @default.
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• W2119372316 date "1988-04-01" @default.
• W2119372316 modified "2023-09-26" @default.
• W2119372316 title "Differential effects of the diacylglycerol kinase inhibitor R59022 on thrombin versus collagen-induced human platelet secretion" @default.
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• W2119372316 doi "https://doi.org/10.1016/0167-4889(88)90082-1" @default.
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