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Journal of Experimental Biology 113,409-421 (1984)
Published by Company of Biologists 1984

Antidiuretic Action of a Corpus Cardiacum Factor (CTSH) on Long-Term Fluid Absorption Across Locust Recta in Vitro

B. PROUX ¹, J. PROUX ¹, and J. E. PHILLIPS ²

¹ Department of Zoology, University of British Columbia, Vancouver, B.C., V6T 2A9, Canada; Laboratoire de Neuroendocrinologie, Université de Bordeaux 1, Avenue des Facultes, 33405 Talence Cedex, France.
² Department of Zoology, University of British Columbia, Vancouver, B.C., V6T 2A9, Canada

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Long-term fluid absorption (Jv) by everted rectal sacs from locusts is stimulated by both corpus cardiacum (CC) extracts and cAMP in a dosedependent manner. This hormonal antidiuretic activity (ADH) is present in both nervous and glandular lobes of CC. This distribution is similar to that of chloride transport stimulating hormone (CTSH) but not to that of other factors previously reported from this gland. As expected if ADH were due to CTSH acting on electrogenic Cl^- transport, CC extracts also increased the electropotential across rectal sacs, and the stimulation of fluid absorption ceased in Cl-free salines. CC extracts also caused recta to absorb fluid against larger osmotic gradients, suggesting that the antidiuretic factor acts on the ion-dependent active transport of fluid rather than on the osmotic permeability of the rectal wall.

Key words: Fluid absorption, antidiuretic, locust rectum, CTSH

Accepted on May 10, 1984

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