Title : Effects of the calmodulin antagonists fendiline and calmidazolium on aggregation, secretion of ATP, and internal calcium in washed human platelets.

Pub. Date : 1991 Jan

PMID : 2030746






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1 Therefore, we studied the effects of the calmodulin antagonists fendiline and calmidazolium on the thrombin-induced aggregation, secretion of ATP, and increases in the intracellular free calcium concentration ([Ca2+]i) in washed human platelets in the absence and presence of extracellular Ca2+. Fendiline coagulation factor II, thrombin Homo sapiens
2 The effect of fendiline could be partly reversed by extracellular Ca2+ and higher thrombin concentrations. Fendiline coagulation factor II, thrombin Homo sapiens
3 Furthermore, aggregations induced by the calcium ionophore ionomycin and by the protein kinase C-activator 4-beta-phorbol 12-myristate 13-acetate were inhibited by fendiline, although to a smaller degree than the thrombin-induced aggregation. Fendiline coagulation factor II, thrombin Homo sapiens
4 Thrombin-induced secretion of ATP was attenuated by low concentrations of fendiline (1-3 microM) and calmidazolium (1 microM) but enhanced by higher concentrations (10-30 and 3-10 microM, respectively), independently of extracellular Ca2+. Fendiline coagulation factor II, thrombin Homo sapiens