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- W2129100727 abstract "Objective— To study the interactions of cytoplasmic calcium elevation, mitochondrial permeability transition pore (mPTP) formation, and reactive oxygen species formation in the regulation of phosphatidylserine (PS) exposure in platelets. Methods and Results— mPTP formation, but not the degree of cytoplasmic calcium elevation, was associated with PS exposure in wild-type, cyclophilin D–null, ionomycin-treated, and reactive oxygen species–treated platelets. In the absence of the mPTP regulator cyclophilin D, agonist-initiated mPTP formation and high-level PS exposure were markedly blunted, but cytoplasmic calcium transients were unchanged. Mitochondrial calcium (Ca 2+ mit ) transients and reactive oxygen species, key regulators of mPTP formation, were examined in strongly stimulated platelets. Increased reactive oxygen species production occurred in strongly stimulated platelets and was dependent on extracellular calcium entry, but not the presence of cyclophilin D. Ca 2+ mit increased significantly in strongly stimulated platelets. Abrogation of Ca 2+ mit entry, either by inhibition of the Ca 2+ mit uniporter or mitochondrial depolarization, prevented mPTP formation and exposure but not platelet aggregation or granule release. Conclusion— Sustained cytoplasmic calcium levels are necessary, but not sufficient, for high-level PS exposure in response to agonists. Increased Ca 2+ mit levels are a key signal initiating mPTP formation and PS exposure. Blockade of Ca 2+ mit entry allows the specific inhibition of platelet procoagulant activity." @default.
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- W2129100727 date "2012-12-01" @default.
- W2129100727 modified "2023-10-16" @default.
- W2129100727 title "Mitochondrial Calcium and Reactive Oxygen Species Regulate Agonist-Initiated Platelet Phosphatidylserine Exposure" @default.
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- W2129100727 doi "https://doi.org/10.1161/atvbaha.112.300433" @default.
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