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Journal of Experimental Biology 90,123-142 (1981)
Published by Company of Biologists 1981

Na and Cl Transport across the Isolated Anterior Intestine of the Plaice Pleuronectes Platessa

M. M. P. RAMOS ¹ and J. C. ELLORY ¹

¹ Physiological Laboratory, University of Cambridge, Cambridge CB2 3EG

1. The tissue was found to have a serosa negative potential, and short-circuit currents equivalent to the net Cl transport. 2. A significant part of the Cl uptake was Na dependent and a similar fraction of the Na uptake was Cl dependent. 3. Short-circuit current and uptake of both ions were inhibited by loop diuretics and analogues. 4. I₈₀ and P.D. were abolished by ouabain. 5. The observations are consistent with the idea of a coupled NaCl entry into the cell, using the energy inherent in the Na gradient; Na being pumped out of the cells by the Na pump and followed electrically by Cl^-. Net chloride transport and the serosa negative potential would be a consequence of the permselective properties of the junctions allowing Na but not Cl to recycle back to the mucosal solution.

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