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• W2888958087 abstract "Blood platelets from hypertensive patients and spontaneously hypertensive rats (SHR) display multiple abnormalities when compared with cells from normotensive controls. The major features of the modified platelet profile are an enhanced rate of adhesion/aggregation in response to many stimuli, a greater sensitivity for thrombin and adrenaline to produce increases in cytoplasmic free Ca2+, and an exaggerated release reaction. Furthermore, the resting levels of cytosolic free Ca2+ ions are specifically and constantly increased. Since phosphoinositides are involved in the stimulus-response coupling mediated by intracellular Ca2+ mobilization, the metabolism of these lipids was investigated in platelets of SHR and compared with those of normotensive Wistar-Kyoto rats (WKY). Following 32P-labelling of quiescent platelets, labeled lipids were analyzed both in platelets at rest and after thrombin stimulation. In resting platelets, the 32P associated with each of the phosphoinositides and phosphatidic acid (PA) was similar in SHR and WKY indicating that both the pool size of the various lipids and their basal turnover did not differ between the two strains. By contrast, within the first seconds after thrombin stimulation (10-60 sec), the dose-response and time-course curves of agonist-induced increase in 32P-PA were markedly shifted to the left and reached higher equilibrium levels in SHR. Since thrombin-induced 32P-PA formation is held as the most sensitive index of phospholipase C activity, our results indicate that this enzyme displays hyperreactivity in SHR (vs WKY). It is therefore likely that in SHR, the enhanced physiological responses (serotonin secretion, aggregation) that we observed under the same experimental conditions may be related to an increased formation of Phospholipase C products (inosi-toltriphosphate and diacylglycerol) which are the two second messengers responsible for internal Ca2+ mobilization and activation of protein kinase C, respectively. Therefore, these data suggest that the hypersensitivity of Phospholipase C may be involved in the overall alteration of cell calcium handling and hence in the SHR platelet responses." @default.
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• W2888958087 date "1987-01-01" @default.
• W2888958087 modified "2023-09-23" @default.
• W2888958087 title "IMPAIRMENT OF PLATELET PHOSPHOINOSITIDE METABOLISM IN PRIMARY HYPERTENSION" @default.
• W2888958087 doi "https://doi.org/10.1055/s-0038-1643812" @default.
• W2888958087 hasPublicationYear "1987" @default.
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