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- W1505597451 abstract "The role of Ca2+/calmodulin-dependent processes in the activation of the Na+/H+ antiport of primary cultures of rat aortic smooth muscle was studied using 22Na+ uptake and measurement of intracellular pH (pHi) with the fluorescent pH dye 2',7'-bis-(2-carboxyethyl)-5(and 6)-carboxyfluorescein. Antiport activation following exposure to serum and by the induction of an intracellular acidosis could be markedly attenuated by calmodulin antagonists. Ionomycin also transiently elevated pHi and 5-(N-ethyl-N-isopropyl) amiloride-sensitive 22Na+ influx, effects consistent with activation of the antiport; these effects were abolished in cells exposed to calmodulin antagonists or [ethylenebis(oxyethylenenitrilo)]tetraacetic acid. Activation of the antiport following intracellular acidosis was markedly affected by cellular ATP depletion. A comparison of the abilities of control and 2-deoxy-D-glucose-treated cells to increase 5-(N-ethyl-N-isopropyl)amiloride-sensitive 22Na+ influx in response to graded acidifications indicated that attenuation of Na+/H+ antiport activity was due to both a shift of its pHi dependence and to a reduction in maximal activity. The results suggest that the Na+/H+ antiport of rat aortic smooth muscle is dependent on Ca2+/calmodulin-dependent processes, presumably phosphorylation, which influences its activity by modulating (i) an intracellular proton dependent regulatory mechanism (allosteric site) and (ii) the maximum activity of the antiport." @default.
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- W1505597451 date "1988-11-01" @default.
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- W1505597451 title "Dependence of Na+/H+ antiport activation in cultured rat aortic smooth muscle on calmodulin, calcium, and ATP. Evidence for the involvement of calmodulin-dependent kinases." @default.
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- W1505597451 doi "https://doi.org/10.1016/s0021-9258(18)37459-3" @default.
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