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. 1990 Aug;86(2):498–506. doi: 10.1172/JCI114736

Enhancement of electrogenic Na+ transport across rat inner medullary collecting duct by glucocorticoid and by mineralocorticoid hormones.

R F Husted 1, J R Laplace 1, J B Stokes 1
PMCID: PMC296752  PMID: 2384596

Abstract

We have investigated the effect of steroid hormones on Na+ transport by rat renal inner medullary collecting duct (IMCD) cells. These cells, grown on permeable supports in primary culture, grow to confluence and develop a transmonolayer voltage oriented such that the apical surface is negative with respect to the basal surface. The results of these experiments demonstrate that this voltage is predominantly (or exclusively) the result of electrogenic Na+ absorption. Na+ transport can be stimulated two- to fourfold by exposure to either dexamethasone or aldosterone (100 nM). Experiments using specific antagonists of the glucocorticoid and mineralocorticoid receptors indicate that activation of either receptor stimulates electrogenic Na+ transport; electroneutral Na+ transport is undetectable. Two other features of the IMCD emerge from these studies. (a) These cells appear to have the capacity to metabolize the naturally occurring glucocorticoid hormone corticosterone. (b) The capacity for K+ secretion is minimal and steroid hormones do not induce or stimulate conductive K+ secretion as they do in the cortical collecting duct.

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Selected References

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