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- W2020453492 abstract "1. Depolarization of mesangial cells has been shown to occur following an outward movement of chloride ions from the cell. We have shown previously that mesangial cells from the H-2Kb-tsA58 transgenic mouse possess a significant whole-cell chloride conductance and consequently are a suitable preparation for the study of potential chloride channel inhibitors. 2. The effects on the whole-cell chloride conductance of the chloride channel inhibitor, 5-nitro-2-(3-phenylpropylamino)-benzoate (NPPB) and the potassium channel openers, (KCOs) P1075 and pinacidil were investigated in mesangial cells from the H-2Kb-tsA58 transgenic mouse cultured in permissive conditions (at 33 degrees C in the presence of 50 u ml-1 murine gamma-interferon). 3. In symmetrical solutions of 140 mM tetramethylammonium chloride (TMAC1) the whole-cell chloride conductance was 1.08 +/- 0.05 nS (n = 63) and this could be reversibly inhibited by 5 x 10(-5) M NPPB. 4. Both P1075 and pinacidil inhibited the whole-cell chloride conductance. This inhibition was not reversible after drug washout and was demonstrated only when drugs were applied to the extracellular surface of the cells. Very low concentrations of the drugs were found to reduce the chloride conductance after 16 h incubation but under no circumstances studied was the conductance totally inhibited, leaving a mean residual current of 0.33 +/- 0.03 nS (n = 12). 5. The effects of different peptide calcium concentrations on the magnitude of the residual current in the presence of the drugs were investigated. The residual current was reduced with 10(-8) M calcium in the pipette and increased with 10(-3) M pipette calcium. Therefore, these data suggest that P1075 and pinacidil selectively inhibit a calcium-independent chloride conductance in mesangial cells from the H-2Kb-tsA58 transgenic mouse." @default.
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- W2020453492 title "Inhibition by P1075 and pinacidil of a calcium-independent chloride conductance in conditionally-immortal renal glomerular mesangial cells" @default.
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- W2020453492 doi "https://doi.org/10.1111/j.1476-5381.1996.tb15739.x" @default.
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