AJP - Regulatory, Integrative and Comparative Physiology, Vol 260, Issue 6 1023-R1035, Copyright © 1991 by American Physiological Society

EDITORIAL

Consequences of differential effects of ADH and other peptide hormones on thick ascending limb of mammalian kidney

C. De Rouffignac, A. Di Stefano, M. Wittner, N. Roinel and J. M. Elalouf

Several hormones stimulate the adenylate cyclase system of the thick ascending limb (TAL). There are, however, some species differences concerning the cyclase sensitivity and the hormonal response in this nephron segment. In the mouse, antidiuretic hormone (ADH), parathyroid hormone, glucagon, calcitonin, and isoproterenol stimulate Na+, Cl-, Mg2+, and Ca2+ transports in the cortical TAL, whereas ADH, glucagon, and isoproterenol stimulate NaCl transport only in the medullary TAL. Many of these effects are different from those previously described for the corresponding segments of the rabbit nephron. The close similarity of the cyclase responsiveness to hormones of the mouse and rat TALs makes it possible to interpret the micropuncture data obtained in vivo in the rat superficial (S) and juxtamedullary (JM) nephrons, in the light of the in vitro data obtained in the mouse. Long-term treatment of Brattleboro rats with ADH also elicits differential effects along the TAL. Their consequences on the function of the S and JM nephrons are also examined. There are several indications supporting the view that the newly described hormonal effects in the mouse and rat are of physiological relevance.

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