PMID: 8145173Dec 1, 1993Paper

A chloride current associated with swelling of cultured chick heart cells

The Journal of Physiology
J ZhangM Lieberman


1. Cultured chick heart cells challenged by hyposmotic stress underwent regulatory volume decrease (RVD) that was attenuated by prior depletion of intracellular chloride. 2. During hyposmotic swelling, cell aggregates experienced an initial increase in spontaneous contractile activity followed by eventual quiescence. Conventional microelectrode studies revealed an underlying increase in spontaneous electrical activity, followed by a sustained depolarization beyond threshold. 3. Whole-cell patch clamp studies, with K+ currents blocked, indicated that exposure of cells to hyposmotic solution (NaCl reduction) resulted in a rapid osmotic swelling followed by a substantial increase in whole-cell conductance which persisted for the duration of hyposmotic exposure and was almost completely reversed on return to isosmotic bath solution. 4. For a variety of Cl- concentrations, the reversal potentials (Erev) of the measured swelling-activated current closely followed the calculated Cl- equilibrium potential (ECl) with a linear regression slope of 0.82. When estimated by the Nernst equation, the relationship between Erev and the [Cl-]i/[Cl-]o ratio fitted well with a slope of 51 mV per decade change in the concentration ratio, consistent ...Continue Reading


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