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Role of passive potassium fluxes in cell volume regulation in cultured HeLa cells

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Summary

Cultured HeLa cells behave as ideal osmometers when subjected to hyperosmolar media, and show no volume regulatory behavior. In hypoosmolar solutions, cell swelling is not as great as predicted, and this is due largely to a loss of intracellular KCl. In hyperosmolar solutions there is a stimulation of the ouabain-insensitive but loop diuretic-sensitive86Rb+ (K+) pathway. Analysis of the K+, Na+ and Cl− dependency of this K+ flux pathway demonstrates that the increase is principally due to an increase in its maximal velocity (V max). The sensitivity of this pathway to diuretic inhibition is unchanged in hyperosmolar media. Diuretic-sensitive86Rb+ (K+) efflux stimulated by hypertonicity shows no marked dependence on external K+. The K+ loss observed in hypoosmolar media is distinct from the K+ transport pathway stimulated by hyperosmolar media on the basis of its sensitivity to furosemide and anion dependence.

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Authors and Affiliations

  1. Department of Physiology and Pharmacology, University of St. Andrews, KY16 9TS, St. Andrews, Fife, UK

    D. R. Tivey & J. F. Aiton

  2. Department of Physiological Sciences, University of Newcastle upon Tyne, NE1 7RU, Newcastle upon Tyne, UK

    N. L. Simmons

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  1. D. R. Tivey
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  2. N. L. Simmons
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  3. J. F. Aiton
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Tivey, D.R., Simmons, N.L. & Aiton, J.F. Role of passive potassium fluxes in cell volume regulation in cultured HeLa cells. J. Membrain Biol. 87, 93–105 (1985). https://doi.org/10.1007/BF01870656

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  • DOI: https://doi.org/10.1007/BF01870656

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