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Concise Publication Free access | 10.1172/JCI107065
1Department of Biochemistry, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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1Department of Biochemistry, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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1Department of Biochemistry, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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1Department of Biochemistry, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Published September 1, 1972 - More info
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.
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