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. 1988 Apr;85(8):2873–2877. doi: 10.1073/pnas.85.8.2873

Cell volume regulation by the thin descending limb of Henle's loop.

A G Lopes 1, L M Amzel 1, D Markakis 1, W B Guggino 1
PMCID: PMC280102  PMID: 2833759

Abstract

Thin descending limb cells from Henle's loop (from the inner strip of the outer medulla of long loops) were studied with optical and video techniques to identify the mechanisms of ion transport and cell volume regulation. Increasing the K+ concentration in the basolateral solution from 5 to 90 mM caused the cells to swell. This K+-induced swelling was inhibited by exposure of the basolateral membrane to 9 mM Ba2+ and was abolished by removing Cl- from the perfusion solutions. Decreasing the perfusion osmolality caused an increase in cell volume followed by a return to the preexposure volume. The latter regulatory decrease in hypoosmolality was slowed by basolateral Ba2+ and the removal of HCO-3 from the solutions. Further slowing occurred when both HCO-3 and Cl- were removed. Exposure of cells to ouabain abolished volume regulation. These data suggest that the basolateral cell membrane of the thin descending limb has a Cl- -dependent K+ permeability, which is important in cell volume regulation. The cells also possess Cl- and HCO-3 transport pathways that participate in volume regulation. Finally, volume regulation is dependent upon the operation of the Na/K pump.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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