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The Journal of General Physiology, Vol 91, 529-548, Copyright © 1988 by The Rockefeller University Press
ARTICLES |
F Garcia-Romeu, R Motais and F Borgese
Laboratoire Jean Maetz, Departement de Biologie du Commissariat a l'Energie Atomique, Villefranche-sur-Mer, France.
The erythrocytes of the trout, Salmo gairdneri, react to beta- adrenergic stimulation by activating a cyclic AMP-dependent and amiloride-sensitive Na+/H+ antiporter (see Borgese, F., F. Garcia- Romeu, and R. Motais, Journal of General Physiology, 1986, 87:551-566). The present study traces the kinetic behavior of the unidirectional Na fluxes after stimulation by isoproterenol. A very considerable increase (100-fold) of the unidirectional Na influx (JNa(in)) follows the addition of isoproterenol to the erythrocyte suspension. After 1.5 min, JNa(in) falls suddenly, and asymptotically diminishes toward the nonstimulated flux level. The unidirectional Na efflux (JNa(out)) proceeds according to similar kinetics. The decrease of JNa(in) and JNa(out)is not linked to either a change in the driving forces of the transported ions or a decrease of the cyclic AMP concentration but to a desensitization of the Na+/H+ antiporter. This desensitization is dependent on the external Na concentration and is not controlled by internal Na, cell swelling, or external Ca.
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