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Journal of Experimental Biology 88,161-174 (1980)
Published by Company of Biologists 1980

The Transepithelial Potential and Osmotic Regulation in the Green Hydra

BENJAMIN M. CHAIN 1

1 Department of Zoology, University of Cambridge; The Sloan-Kettering Institute for Cancer Research, Donald S. Walker Laboratory, Boston Post Rd., Rye, N.Y. 10580, U.S.A.

The properties of the ion-transporting systems in the green Hydra were investigated by measuring the trans-epithelial potential and the potential profile across the body wall. The major potential step occurs across the inner ectodermal membrane, and is produced by an inwardly directed electrogenic sodium pump, which is sensitive to ethacrynic acid but not to ouabain. Calcium ions inhibit sodium transport across the epithelium. Calculations using data for the short-circuit current across the epithelium show that sodium transport requires a relatively high rate of energy expenditure, as would be expected ‘a priori’ for a small organism.

Submitted on January 4, 1980






© The Company of Biologists Ltd 1980