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Metabolic regulation of apical sodium permeability in toad urinary bladder in the presence and absence of aldosterone

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Summary

In the present study, further evidence was adduced for energy-dependent regulation of passive apical transport of Na in toad bladder epithelium. In potassium-depolarized preparations studied by current-voltage analysis, additions of pyruvate or glucose to the media of substrate-depleted bladders evoked propertionate increases in the transepithelial Na current and in apical Na permeability. These reponses were large in aldosterone pretreated hemibladders and almost absent in the aldosterone-depleted preparations or when hormonal action was blocked by spironolactone or cycloheximide. The substrateinduced increases in apical Na permeability were fully reversed by appropriate metabolic inhibitors, i.e. 2-deoxyglucose and oxythiamine. Moreover, the inhibitory effect of 2-deoxyglucose was bypassed by the addition of pyruvate to the serosal medium. Thus apical Na permeability is clearly sensitive to the supply of cellular energy. The possibility that changes in intrcellular free Na activity may mediate metabolic regulation of apical Na permeability was evaluated by prolonged exposure to Na-free mucosal and serosal media, with and without inhibition of the Na/K-pump by ouabain. The stimulatory and inhibitory effects of pyruvate, 2-deoxyglucose and oxythiamine on Na currents and Na conductances were preserved under these circumstances. Furthermore, reduction of serosal Ca to a minimal level of 3 μm, was without effect on the response to metabolic inhibition. These experiments demonstrate the existence of Na-independent metabolic regulation of apical Na transport and imply that neither basal-lateral nor mitochondrial Na/Ca exchange is required for this regulatory process under the imposed conditions. The possibility that a Na-independent, Ca transport mechanism in mitochondria or endoplasmic reticulum may be involved in metabolic regulation of apical Na transport, however, remains to be evaluated.

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  1. Haim Garty

    Present address: Department of Membrane Research, The Weizmann Institute of Science, Rehovot, Israel

Authors and Affiliations

  1. II. Physiologisches Institut der Universität des Saarlandes, 6650, Homburg/Saar, West Germany

    Haim Garty, Isidore S. Edelman & Bernd Lindemann

  2. Department of Biochemistry, College of Physicians and Surgeons, Columbia University, New York, New York

    Haim Garty, Isidore S. Edelman & Bernd Lindemann

Authors
  1. Haim Garty
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  2. Isidore S. Edelman
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  3. Bernd Lindemann
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Garty, H., Edelman, I.S. & Lindemann, B. Metabolic regulation of apical sodium permeability in toad urinary bladder in the presence and absence of aldosterone. J. Membrain Biol. 74, 15–24 (1983). https://doi.org/10.1007/BF01870591

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  • DOI: https://doi.org/10.1007/BF01870591

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