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- W162674107 abstract "The correlation between energy consumption and platelet responses induced by collagen, A23187 and ADP was investigated and compared with the energetics of thrombin-stimulated platelets established in earlier work. Aggregation, measured as single-platelet disappearance, and secretion correlated quantitatively with the increment but not with the total consumption of energy, suggesting that the former reflects the energy cost of these responses. The cost of complete aggregation was 2-3 mumol of ATP equivalents/10(11) platelets with collagen, ADP and thrombin as the stimulus. The cost of complete dense-granule secretion was 0.5-0.8 mumol of ATP equivalents/10(11) platelets with all agonists tested. The cost of combined secretion of alpha-granule and acid hydrolase granule contents was 5-7 mumol of ATP equivalents/10(11) platelets with thrombin and collagen. However, in the presence of A23187 much more energy was consumed during aggregation and secretion. Also ADP triggered more energy consumption during secretion than was seen with the other inducers. The effect of inhibitors of aggregation and secretion was investigated in thrombin-stimulated platelets. Raising the cellular cyclic AMP content sharply decreased the increment in energy consumption as well as aggregation and secretion. The cytoskeleton-disrupting agents cytochalasin B and colchicine left the increment in energy consumption intact, but decreased the basal consumption seen in unstimulated platelets. This was accompanied by normal (cytochalasin B) or diminished (colchicine) aggregation and secretion. Apart from the latter exception, all inhibitors decreased secretion and incremental energy consumption in parallel, thereby preserving the energy-versus-secretion relationship established in earlier work. In contrast, aggregation and energy consumption varied independently, suggesting that the coupling with energy consumption is much weaker for this response." @default.
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- W162674107 date "1986-06-15" @default.
- W162674107 modified "2023-10-18" @default.
- W162674107 title "Comparative studies on the energetics of platelet responses induced by different agonists" @default.
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- W162674107 doi "https://doi.org/10.1042/bj2360879" @default.
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