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- W2072446999 abstract "To determine platelet Ca2+ transport entities involved in increased cytosolic Ca2+ in the platelets of hypertensive individuals, we studied the relations between blood pressure and Ca2+ transporters in platelet membranes from 22 white male volunteers 32 to 68 years old. We used thapsigargin, a specific inhibitor of the internal membrane Ca(2+)-ATPase, to differentiate between plasma membrane and internal membrane Ca(2+)-ATPases. Inositol 1,4,5-trisphosphate-mediated and Ca2+ ionophore (A23187)-induced Ca2+ release was also assayed in membrane preparations using rhod-2, a fluorescent Ca2+ indicator. Levels of glycoprotein IIIa, a possible component of agonist-mediated Ca2+ influx, were measured by immunoblotting. The results show that plasma membrane Ca(2+)-ATPase is decreased as a function of diastolic blood pressure (P < .002), whereas the internal membrane Ca(2+)-ATPase is not (P < .148). Neither activity is correlated with age or systolic blood pressure. However, inositol trisphosphate-mediated Ca2+ release is negatively correlated with age (P < .024) but not blood pressure. Glycoprotein IIIa levels and A23187-induced Ca2+ release were not related to age or blood pressure, demonstrating that inhibition of the plasma membrane Ca(2+)-ATPase was not a result of differences in the proportion of plasma membrane in the preparation or differences in intravesicular Ca2+ concentration. Inhibition of the plasma membrane Ca(2+)-ATPase could directly cause elevation of cytoplasmic Ca2+ and enhancement of platelet sensitivity." @default.
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- W2072446999 date "1994-01-01" @default.
- W2072446999 modified "2023-09-27" @default.
- W2072446999 title "Platelet calcium transport in hypertension." @default.
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- W2072446999 doi "https://doi.org/10.1161/01.hyp.23.1.31" @default.
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