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Distal tubular segments of the rabbit kidney after adaptation to altered Na- and K-intake

II. Changes in Na-K-ATPase activity

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Summary

Na-K-ATPase activity was measured in the convoluted part of the distal tubule (DCT), the connecting tubule (CNT) and the cortical collecting duct (CCD). The segments were microdissected from freeze-dried kidney tissue of rabbits adapted to various salt diets and exposed to large differences in endogenous and exogeneous mineralocorticoids.

The Na-K-ATPase activity in the DCT is not influenced by mineralocorticoids. They do influence the activity in the CNT and in the CCD. In the CNT the highest activity was found with a low Na-, high K-diet. At the beginning of the CNT the enzyme activity is higher than in the end portion. While canrenoate-K treatment has no effect on Na-K-ATPase activity in the initial portions of the CNT, this drug decreases the Na-K-ATPase activity significantly in the end portion of the CNT. DOCA treatment has a significant effect on the enzyme activity in the CNT only in the end-portion of the segment, but provokes the highest Na-K-ATPase activity in the CCD.

The changes in Na-K-ATPase are found to be associated with corresponding changes in the baso-lateral cell-membrane area in the segments affected.

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Authors and Affiliations

  1. Medizinische Universitäts-Poliklinik and Department Forschung, Kantonsspital Basel, Schweiz

    Michel Le Hir & Ulrich C. Dubach

  2. Anatomisches Institut der Universität Heidelberg, Heidelberg, Bundesrepublik Deutschland

    Brigitte Kaissling

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  1. Michel Le Hir
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  2. Brigitte Kaissling
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Supported by the Swiss National Science Foundation, Grant No. 3.900-0.79, and by SFB 90, CARVAS, Heidelberg

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Le Hir, M., Kaissling, B. & Dubach, U.C. Distal tubular segments of the rabbit kidney after adaptation to altered Na- and K-intake. Cell Tissue Res. 224, 493–504 (1982). https://doi.org/10.1007/BF00213747

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