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- W2165405514 abstract "Whole-cell patch clamp was used to look for cystic fibrosis transmembrane-conductance regulator (CFTR)-like chloride currents in calcium-tolerant human cardiac myocytes. Potassium-containing solutions were used initially. Steady state currents were measured with hyperpolarizing ramps (-16.25 mV/s). Peak net inward currents during voltage steps from -50 to +5 mV were used as an index of L-type calcium current. Isoproterenol (1 mumol/L) or forskolin (10 mumol/L) were used in attempts to evoke CFTR-like chloride current. No forskolin- or isoproterenol-induced steady state current was found in any of 17 atrial cells from seven patients in the absence of cell swelling. Every cell exhibited a large increase in net inward current in response to forskolin, suggesting that cAMP-dependent stimulation of L-type calcium current was present. Swelling with osmotic stress induced an outwardly rectifying steady state current with a reversal potential close to the chloride equilibrium potential. Once this current was activated, exposure to forskolin caused a further increase that subsided on washout (four of four cells, two patients). The atrial swelling-induced current was studied in more detail by using cesium-containing solutions. The current was determined to be a chloride current because the reversal potential was sensitive to changes in intracellular chloride and outward currents were blocked by 150 mumol/L DIDS. Ventricular cells were isolated from five failing human hearts. No CFTR-like current was found in any of 17 cells. In eight of eight ventricular cells, a swelling-induced current was found. The amplitude of the swelling-induced current was enhanced by forskolin.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2165405514 date "1995-06-01" @default.
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- W2165405514 title "Forskolin Stimulates Swelling-Induced Chloride Current, Not Cardiac Cystic Fibrosis Transmembrane-Conductance Regulator Current, in Human Cardiac Myocytes" @default.
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- W2165405514 doi "https://doi.org/10.1161/01.res.76.6.1063" @default.
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