Abstract
The effect of electrical stimulation on cell volume, V c, and its relationship to membrane potential, E m, was investigated in Rana temporaria striated muscle. Confocal microscope xz-plane scanning and histology of plastic sections independently demonstrated significant and reversible increases in V c of 19.8±0.62% (n=3) and 27.1±8.62% (n=3), respectively, after a standard stimulation protocol. Microelectrode measurements demonstrated an accompanying membrane potential change, ΔE m, of +23.6±0.98 mV (n=3). The extent to which this ΔE m might contribute to the observed changes in V c was explored in quiescent muscle exposed to variations in extracellular potassium concentration, [K+]e. E m and V c varied linearly with log [K+]e and [K+]e, respectively, in the range 2.5–15 mM (R 2=0.99 and 0.96), and these results were used to reconstruct an approximately linear relationship between V c and E m (ΔV c=0.85E m+68.53; R 2=0.99) and hence derive the ΔV c expected from the ΔE m during stimulation. This demonstrated that both the time course and magnitude of the increase and recovery of V c observed in active muscles could be reproduced by the corresponding [K+]e-induced depolarisation in quiescent muscles, suggesting that the depolarisation associated with membrane activity makes a substantial contribution to the cell swelling during exercise. Furthermore, conditions of Cl− deprivation abolished the relationship between E m and V c, supporting a mechanism in which the depolarisation of E m drives a passive redistribution of Cl− and hence cellular entry of Cl− and K+ and an accompanying, osmotically driven, increase in V c.
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Acknowledgements
C.L.-H.H. thanks the Medical Research Council, the Wellcome Trust and the British Heart Foundation for generous support. J.A.U-S. thanks Astra Zeneca and acknowledges additional support from the James Baird Fund. J.N.S thanks the Wellcome Trust for support, and J.A.F was supported by the George Henry Lewes Fund.
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Usher-Smith, J.A., Skepper, J.N., Fraser, J.A. et al. Effect of repetitive stimulation on cell volume and its relationship to membrane potential in amphibian skeletal muscle. Pflugers Arch - Eur J Physiol 452, 231–239 (2006). https://doi.org/10.1007/s00424-005-0022-9
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DOI: https://doi.org/10.1007/s00424-005-0022-9