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Abstract

Keeping Xenopus laevis Daudin in sodium-rich or sodium-free media leads to hypernatraemia or hyponatraemia respectively. Approximately 3 weeks after adenohypophysectomy, sodium and chloride concentrations in plasma and tissue water were reduced; there was also a net loss of the ions from the muscle. Potassium was not significantly affected. Aminoglutethimide, a proven inhibitor of corticosteroidogenesis in mammals, produced similar though more pronounced changes. In the adenohypophysectomized animal, this drug also produced a net increase in muscle potassium. The role of the urinary bladder in reabsorbing sodium has been demonstrated in Xenopus by an in-vivo technique. While the rate of urine flow was reduced in adenohypophysectomized toads, the rate of sodium excretion was essentially unchanged.