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- W2185112720 abstract "Modulation of L-type Ca2+ channel current by extracellular pH (pHo) was studied in vascular smooth muscle cells from bovine pial and porcine coronary arteries. Relative to pH 7.4, alkaline pH reversibly increased and acidic pH reduced ICa. The efficacy of pHo in modulating ICa was reduced when the concentration of the charge carrier was elevated ([Ca2+]o or [Ba2+]o varied between 2 and 110 mM). Analysis of whole cell and single Ca2+ channel currents suggested that more acidic pHo values shift the voltage-dependent gating (approximately 15 mV per pH-unit) and reduce the single Ca2+ channel conductance gCa due to screening of negative surface charges. pHo effects on gCa depended on the pipette [Ba2+] ([Ba2+]p), pK*, the pH providing 50% of saturating conductance, increased with [Ba2+]p according to pK* = 2.7-2.log ([Ba2+]p) suggesting that protons and Ba2+ ions complete for a binding site that modulates gCa. The above mechanisms are discussed in respect to their importance for Ca2+ influx and vasotonus." @default.
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- W2185112720 date "1994-04-01" @default.
- W2185112720 modified "2023-10-15" @default.
- W2185112720 title "Calcium channel current of vascular smooth muscle cells: extracellular protons modulate gating and single channel conductance." @default.
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- W2185112720 doi "https://doi.org/10.1085/jgp.103.4.665" @default.
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