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- W306114400 abstract "In the present study, the effect of phorbol ester, 12-0-tetradecanoylphorbol 13-acetate (TPA), activation of protein kinase C on coronary vascular reactivity was studied in isolated dog coronary arteries. Addition of TPA (10-100 nM) produced a slow, time- and dose-dependent contraction reaching a maximum at approx 2-3 hrs and was essentially irreversible upon washing. Disruption of the endothelium(EC) greatly accelerated the development as well as increase the magnitude of TPA contraction (50-100%). Prior treatment of vessels with phentolamine (1..mu..M), cyproheptadine (1..mu..H) and ibuprofen (1..mu..g/ml) did not alter the TPA contraction. Furthermore, in contrast to previously reported calcium-dependence of TPA contraction in other vessels, complete removal of extracellular calcium (Ca/sub 0/) or addition of 1..mu..M nimodipine after TPA(30nM) resulted in only 32 +/- 4% and 25 +/- 3% reversal of TPA contraction, respectively. Addition of amiloride (10..mu..M to 1mM), however, resulted in a dose-dependent reversal of TPA contraction. The results of the present study indicate that a similar activation of protein kinase C by TPA leads to potent coronary vasoconstriction, which is not completely dependent on Ca/sub 0/. More importantly, these results further support their hypothesis that EC also functions as an inhibitory barrier to prevent circulating vasoconstrictors from exerting their deleteriousmore » constrictory effects.« less" @default.
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- W306114400 date "1986-03-05" @default.
- W306114400 modified "2023-09-28" @default.
- W306114400 title "Potentiation of phorbol ester-induced coronary vasoconstriction in dogs following endothelium disruption" @default.
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