Abstract
Isolated renal tubules from vitamin D-deficient chicks catalyse the in vitro conversion of 25-hydroxycholecalciferol to 1,25-dihydroxycholecalciferol. This conversion is stimulated by 5 × 10-10 M bovine parathyroid hormone, or by 10-6 M cyclic AMP. It is inhibited by 10-9 M porcine calcitonin. It is concluded that these hormonal controls of the synthesis of the renal hormone 1,25-dihydroxycholecalciferol are of particular physiological significance in coordinating the activities of the various organs involved in extracellular calcium homeostasis.
Authors
Howard Rasmussen, Mitzi Wong, Daniel Bikle, David B. P. Goodman
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