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Electrophysiological analysis of rat renal sugar and amino acid transport

II. Dependence on various transport parameters and inhibitors

  • Transport Processes, Metabolism and Endocrinology; Kidney, Gastrointestinal Tract, and Exocrine Glands
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Abstract

Transepithelial and cellular electrical potential changes were measured in response to luminal perfusion ofd-glucose and related substrates in micropuncture experiments on rat kidney in vivo. By studying the dependence of the potential response on various experimental parameters, some insight was obtained into the mechanism of Na+ coupled glucose absorption. The experiments confirm the driving forces for glucose absorption in the living cell to be: a) the Na concentration gradient, b) the electrical potential gradient and c) the glucose concentration gradient across the brushborder membrane. Furthermore they describe the substrate specificity of the cotransport mechanism and the mechanism of inhibition ofd-glucose transport by various inhibitors, such as phlorizin, harmaline and oubain. The latter experiments suggest that the active Na+ pump in the peritubular cell membrane, which establishes the Na+ ion gradient and the electrical potential gradient across the brushborder, contributes a measurable partial conductance to the overall electrical conductance of the peritubular cell membrane.

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Author notes

  1. I. Samaržija

    Present address: Centar za Hemodijalizu i Nefrologiju, P. Miskina 64, YU-41000, Zagreb, Yugoslavia

  2. B. T. Hinton

    Present address: Dept. of Urology, University of Virginia, 22901, Charlottesville, Virginia, USA

Authors and Affiliations

  1. Max-Planck-Institut für Biophysik, Kennedyallee 70, D-6000, Frankfurt 70, Germany

    I. Samaržija, B. T. Hinton & E. Frömter

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  1. I. Samaržija
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  2. B. T. Hinton
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  3. E. Frömter
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Samaržija, I., Hinton, B.T. & Frömter, E. Electrophysiological analysis of rat renal sugar and amino acid transport. Pflugers Arch. 393, 190–197 (1982). https://doi.org/10.1007/BF00582943

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  • DOI: https://doi.org/10.1007/BF00582943

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