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Intracellular activities during volume regulation byNecturus gallbladder

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Summary

Necturus gallbladder epithelial cells regulate their volume after a change in solution osmolality. We determined the intracellular activities of Na, K and Cl when the mucosal bathing solution osmolality was increased 18% by the addition of mannitol. The gallbladder was mounted in a rapid flow chamber and punctured simultaneously with two single-barrelled microelectrodes. One electrode sensed membrane potential and the other was sensitive to the activity of Na, K or Cl. Cell volume measurements, made in previous studies utilizing quantitative light microscopy, indicated that hypertonicity of the mucosal bath first caused a cell shrinkage of 15% followed by volume readjustment. Some loss of Na, K and Cl was observed during shrinkage; subsequently during volume regulation, the intracellular quantities of all three ions increased. The loss of Na during the initial cell shrinkage could be blocked by ouabain and was therefore due to increased transport. K and Cl losses were probably related to the increase in their concentrations during shrinkage. The gain of Na, K and Cl during volume regulation was similar in magnitude to the loss of these solutes during cell shrinkage. The increase of Na, K and Cl during volume regulation accounted for about 60% of the increase of cell solutes during this period indicating that other solutes also contributed to the volume regulation response.

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Authors and Affiliations

  1. Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung, and Blood Institute, National Institutes of Health, 20205, Bethesda, Maryland

    Kenneth R. Spring

  2. Department of Nephrology, Walter Reed Army Institute of Research, 20307, Washington, D.C.

    Richard S. Fisher

Authors
  1. Richard S. Fisher
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  2. Kenneth R. Spring
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Fisher, R.S., Spring, K.R. Intracellular activities during volume regulation byNecturus gallbladder. J. Membrain Biol. 78, 187–199 (1984). https://doi.org/10.1007/BF01925967

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  • DOI: https://doi.org/10.1007/BF01925967

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