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Journal of Experimental Biology 128,371-382 (1987)
Published by Company of Biologists 1987

Salinity Acclimation and Intestinal Salt Transport in the Flounder: the Role of the Basolateral Cell Membrane

J. S. GIBSON 1, J. C. ELLORY 2, and B. LAHLOU 3

1 Physiological Laboratory, University of Cambridge, Downing St, Cambridge CB2 3EG
2 Department of Physiology, Parks Road, Oxford OX1 3PT
3 Laboratoire de Physiologie Comparée, Faculté des Sciences et des Techniques, 6034 Nice Cedex, France

1. Intestinal absorption of Na+ and Cl-, measured using bidirectional tracer fluxes, is higher in saltwater (SW)-acclimated flounders than in freshwater (FW)- acclimated ones.

2. Removal of the selective permeability of the apical cell membrane by application of amphotericin B to the mucosal solution enhances the difference in Na+ transport, whilst the difference in Cl- absorption is lost.

3. Transepithelial resistance and JsmNa were similar between the two groups of fish, whilst JsmCl, was always greatest in SW-acclimated tissues, even after mucosal application of amphotericin.

4. Analysis of the present results and previous work suggests that the principal acclimatory changes following salt adaptation occur in the basolateral cell membrane, and that both the Na+, K+-ATPase activity and the basolateral cell membrane permeability to Cl- are increased in the SW-acclimated tissues.

Key words: epithelia, transport, salinity, adaptation

Accepted on November 17, 1986




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© The Company of Biologists Ltd 1987