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- W2944582486 abstract "ABSTRACT Ion movements across biological membranes, driven by electrochemical gradients or active transport mechanisms, control essential cell functions. Membrane ion movements can manifest as electrogenic currents or electroneutral fluxes, and either process can alter the extracellular and/or intracellular concentration of the transported ion(s). Classical electrophysiological methods allow accurate measurement of membrane ion movements when the transport mechanism produces a net ionic current; however, they cannot directly measure electroneutral fluxes and do not detect any accompanying change in intracellular ion concentrations. Here, we developed a method for simultaneously measuring ion movements and the accompanying dynamic changes in intracellular ion concentration(s) in intact skeletal muscle fibers under voltage– or current clamp in real time. The method combines a two-microelectrode voltage-clamp with ion-selective and reference microelectrodes (4 electrode system). We validate the electrical stability of the system and the viability of the preparation for periods of approximately 1 h. We demonstrate the power of this method with measurements of intracellular Cl - , H + , and Na + to show: 1) voltage-dependent redistribution of Cl - ions; 2) intracellular pH changes induced by changes in extracellular pCO 2 ; and 3) electroneutral and electrogenic Na + movements controlled by the Na,K-ATPase. The method is useful for studying a range of transport mechanisms in many cell types, particularly when the transmembrane ion movements are electrically silent and/or when the transport activity measurably changes the intracellular activity of a transported ion." @default.
- W2944582486 created "2019-05-16" @default.
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- W2944582486 date "2019-05-11" @default.
- W2944582486 modified "2023-09-23" @default.
- W2944582486 title "A Four Electrode Method to Study Dynamics of Ion Activity and Transport in Skeletal Muscle Fibers" @default.
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- W2944582486 doi "https://doi.org/10.1101/635490" @default.
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