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- W2283212832 abstract "We investigated whether the enhanced contractile response to norepinephrine caused by a subthreshold concentration of angiotensin II was associated with an increased 45Ca++ influx or net uptake. Rabbit facial artery segments were mounted isometrically to measure the 45Ca++ influx and net uptake in response to norepinephrine. The contractile response to norepinephrine (3 microM) in the presence of angiotensin II (0.1 nM) was 149.5 +/- 7.4% of control. This response amplification was not associated with changes in norepinephrine-induced 45Ca++ influx or net uptake. Angiotensin II also potentiated the contractile response to caffeine obtained in a Ca(++)-free buffer containing ethylene glycol bis(beta-aminoethyl ether)N,N'-tetraacetic acid (2 mM) to 148.0 +/- 4.8% of control. In both cases, the amplification was prevented by pretreatment with either staurosporine (10 nM) or calphostin C (100 nM), two inhibitors of protein kinase C. We conclude that angiotensin II potentiation of norepinephrine-induced vascular tone occurs in the absence of changes in stimulated Ca++ entry. This potentiation may be due to an increase in intracellular sensitivity to Ca++, possibly mediated by protein kinase C." @default.
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- W2283212832 date "1992-06-01" @default.
- W2283212832 modified "2023-09-27" @default.
- W2283212832 title "Angiotensin II amplifies arterial contractile response to norepinephrine without increasing Ca++ influx: role of protein kinase C." @default.
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