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Na transport stimulation by novobiocin: transepithelial parameters and evaluation ofE Na

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

The action of the antibiotic novobiocin on transepithelial Na transport was studied in isolated skins obtained from two different frog species. InRana esculenta addition of novobiocin to the outer bath (1 mM) resulted in a sustained and reversible stimulation of the short-circuit current, transepithelial potential, and transepithelial conductance. Similar, though more variable and much less pronounced changes were observed inRana temporaria. In the presence of amiloride (0.1 mM) novobiocin had no effect on any of the investigated transport parameters and all novobiocin induced changes were fully reversed when amiloride was given subsequently. At reduced external Na concentration or low pH the action of novobiocin was found to be greatly attenuated. In the presence of novobiocin an increased affinity to amiloride and a linearization of the transepithelial current-voltage relationship was observed. The results are consistent with the view that novobiocin increases the Na permeability of the outer membrane, possibly by an attenuation of an Na self-inhibition mechanism. In addition, the driving force of transepithelial Na transport was estimated by means of novobiocin. Several different methods were employed, providing varying results. As shown in an Appendix, for the most part the discrepancies can be explained by changes in the intracellular Na and K concentration. In some cases, novobiocin induced large secondary increases in the skin conductance which can be referred to an increased Cl permeability.

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Abbreviations

Cl0 :

Cl concentration in the outer bath

E i,E o :

electromotive force of the inner, outer membrane

E Na :

apparent driving force of transepithelial Na transport

fR o :

fractional resistance of the outer membrane

go :

conductance of the outer membrane

gsh :

shunt conductance, evaluated by addition of 0.1 mM amiloride1

gt :

transepithelial d.c. conductance

gtc :

transcellular conductance, evaluated by subtracting gsh from gi 1

I sc :

short-circuit current

K a :

concentration of amiloride producing half-maximal inhibition ofI sc

K n :

concentration of novobiocin producing half-maximal stimulation ofI sc at 110 mM Nao

K Na :

concentration of Na0 producing half-maximalI sc

Na0 :

Na concentration of the outer bath

pH0 :

pH of the outer bath

R t :

transepithelial d.c. resistance

V t :

transepithelial electrical potential difference

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Author notes

  1. Roger Rick

    Present address: Department of Physiology and Biophysics, University of Alabama at Birmingham, 35294, Birmingham, AL, USA

Authors and Affiliations

  1. Physiologisches Institut, Universität München, D-8000, München, Germany

    Roger Rick, Adolf Dörge & Edeltraud Sesselmann

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  2. Adolf Dörge
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  3. Edeltraud Sesselmann
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Rick, R., Dörge, A. & Sesselmann, E. Na transport stimulation by novobiocin: transepithelial parameters and evaluation ofE Na . Pflugers Arch. 411, 243–251 (1988). https://doi.org/10.1007/BF00585110

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  • DOI: https://doi.org/10.1007/BF00585110

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