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Human Parathyroid Gland Adenylate Cyclase Activity: Inhibition by 24,25-Dihydroxycholecalciferol in vitro

J. F. Cloix, A. Ulmann, J. D. Monet, J. L. Funck-Brentano
Clinical Science Mar 01, 1981, 60 (3) 339-341; DOI: 10.1042/cs0600339
J. F. Cloix
INSERM U.90, Hôpital Necker, Paris, France
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A. Ulmann
INSERM U.90, Hôpital Necker, Paris, France
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J. D. Monet
* INSERM S.C.R.4, Hôpital Necker, Paris, France
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J. L. Funck-Brentano
INSERM U.90, Hôpital Necker, Paris, France
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Abstract

1. Plasma membranes were prepared from parathyroid adenomas in patients with primary hyperparathyroidism and from hyperplastic glands obtained from patients with chronic renal insufficiency. The basal and isoproterenol- or sodium fluoride-stimulated adenylate cyclase activities were measured in membranes in the presence of several vitamin D3 metabolites.

2. 24,25-Dihydroxycholecalciferol (10 and 1000 pmol/l) decreased isoproterenol- and sodium fluoride-stimulated adenylate cyclase activities in membranes prepared from parathyroid glands. 1,25-Dihydroxycholecalciferol (1000 pmol/l) inhibited the isoproterenol-stimulated adenylate cyclase activity. 25-Hydroxycholecalciferol and vitamin D3 had no effect on adenylate cyclase activities. Basal adenylate cyclase activity was not affected by any of the vitamin D3 metabolites tested.

3. These results indicate that 24,25-dihydroxycholecalciferol inhibits the isoproterenol- and sodium fluoride-stimulated adenylate cyclase activities in parathyroid tissues. Such an inhibition could explain the very rapid decrease in parathyroid hormone secretion after 24,25-dihydroxycholecalciferol administration that has been previously reported.

  • adenylate cyclase
  • parathyroid gland
  • vitamin D3 metabolites
  • © 1981 The Biochemical Society and the Medical Research Society
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March 1981

Volume: 60 Issue: 3

Clinical Science: 60 (3)
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Human Parathyroid Gland Adenylate Cyclase Activity: Inhibition by 24,25-Dihydroxycholecalciferol in vitro
J. F. Cloix, A. Ulmann, J. D. Monet, J. L. Funck-Brentano
Clinical Science Mar 1981, 60 (3) 339-341; DOI: 10.1042/cs0600339
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Human Parathyroid Gland Adenylate Cyclase Activity: Inhibition by 24,25-Dihydroxycholecalciferol in vitro
J. F. Cloix, A. Ulmann, J. D. Monet, J. L. Funck-Brentano
Clinical Science Mar 1981, 60 (3) 339-341; DOI: 10.1042/cs0600339

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Keywords

adenylate cyclase
parathyroid gland
vitamin D3 metabolites

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