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Journal of comparative physiology

, Volume 146, Issue 1, pp 9–16 | Cite as

Evidence for chloride dependent potassium and water transport induced by hyposmotic stress in erythrocytes of the marine teleost,Opsanus tau

  • Peter K. Lauf
Article

Summary

Red blood cells of the marine teleost,Opsanus tau (oyster toadfish), were characterized as to their normal hemoglobin, ion and water contents. Cells were exposed to ouabain containing, hyposmotic salt solutions (osmolarity reduced to 2/3 of normal) in which the cation or anion composition was varied. It was found that the initial cell volume expansion due to water influx was independent of the anion present. However, a secondary volume reduction was dependent on the presence of chloride or bromide anions. During volume reduction, cellular potassium and chloride ion contents fell by about equal amounts. Potassium loss was commensurate to the total amount of potassium ions detected extracellularly about 1.5h after the initial osmotic shock. No major changes were seen in the cellular sodium ion contents. When chloride ions within the cells and in the suspending medium were replaced by nitrate, iodide or thiocyanate, the cells failed to return to volumes close to those of isosmotically suspended controls, and the cellular potassium content also remained constant. In hypotonic potassium chloride the cells failed to extrude potassium chloride and water, and hence retained their expanded volume. Neither potassium loss nor volume decrease occurred in cells swollen in hypotonic sodium chloride media containing furosemide or 4,4′ diisothiocyano-2,2′-stilbene-disulfonic acid (DIDS). These two compounds are known inhibitors of monovalent cation cotransport and anion self exchange, respectively, in mammalian red cells. Hence toadfish red cells respond to osmotic swelling primarily by activation of an ouabain-insensitive, chloride dependent potassium transport system which is sensitive to inhibition by furosemide and DIDS.

Keywords

Ouabain Potassium Chloride Marine Teleost Potassium Loss Bromide Anion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Peter K. Lauf
    • 1
  1. 1.Duke University Marine LaboratoryBeauforfUSA

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