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• W2012856175 endingPage "438" @default.
• W2012856175 startingPage "431" @default.
• W2012856175 abstract "The effects of changes in extra- and intracellular pH in the pathophysiological range (6.0-8.0) on astroglial plasma membrane ionic currents were investigated with the whole-cell patch-clamp technique. In cultured rat neocortical type-1 astrocytes differentiated by a long-term treatment with dibutyryl cyclic-AMP, exposure to an extracellular pH of 6.4 induced, as compared with the control extracellular pH at 7.3, a sustained and reversible increase in the holding current at -60mV. The rise in current was accompanied by a decrease in the apparent input resistance. Ion substitution experiments indicated that extracellular pH 6.4 upregulated the resting Cl(-) conductance, whereas an opposite effect could be observed at extracellular pH 8.0. Recordings of isolated Cl(-) currents showed that this modulation occurred on the previously identified hyperpolarization-activated, inwardly rectifying Cl(-) current, I(Clh). Extracellular acidification to pH 6.4 shifted the voltage dependence of I(Clh) activation by approximately 20mV towards more positive potentials, whereas a approximately 20mV opposite shift was observed upon exposure to extracellular pH 8.0. These effects were paralleled by an increase (extracellular pH 6.4) or decrease (extracellular pH 8.0) in the maximal conductance. Decreasing (6.0) or increasing (8.0) the intracellular pH shifted the steady-state activation of I(Clh) towards more negative or positive potentials, respectively, leaving unchanged the current sensitivity to extracellular pH modifications. The modulation of the inward rectifier Cl(-) current expressed by differentiated cultured neocortical astrocytes indicates that extra- and intracellular changes in pH occurring in a pathophysiological range may contribute to regulating Cl(-) accumulation in astroglial cells." @default.
• W2012856175 created "2016-06-24" @default.
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• W2012856175 date "2000-09-01" @default.
• W2012856175 modified "2023-10-17" @default.
• W2012856175 title "pH modulation of an inward rectifier chloride current in cultured rat cortical astrocytes" @default.
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• W2012856175 doi "https://doi.org/10.1016/s0306-4522(00)00272-4" @default.
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