Influence of estrogen on renal vitamin D hydroxylases and serum 1alpha,25-(OH)2D3 in chicks.

J. W. Pike, E. Spanos, K. W. Colston, I. MacIntyre, M. R. Haussler

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

The influence of estrogen on the metabolism of 25-hydroxyvitamin D3 was studied in 2- to 5-wk-old chicks. Single injections of at least 500 microgram diethylstibestrol (DES) increased the conversion of 25-hydroxyvitamin D3 to 1alpha,25-dihydroxyvitamin D3 (1alpha,25-(OH)2D3) and suppressed the production of 24,25-dihydroxyvitamin D3 in chick kidney homogenates. Acute (one 5-mg) injections of testosterone or progesterone did not enhance the 25-hydroxyvitamin D3-1alpha-hydroxylase, indicating specificity. However, chronic pretreatment with DES appeared to allow the potentiation of previously unstimulatory steroids such as progesterone and testosterone. In addition, the hormonal metabolite of vitamin D3, 1alpha,25-(OH)2D3, was measured in 4- to 6-wk chick plasma after steroid treatment. Greater than 1 mg DES per day for 5 days was necessary to enhance the circulating level of 1alpha,25-(OH)2D3; testosterone alone had no effect. This elevation was rapid, occurring within 12--24 h after injection. These data suggest that estrogen (as evidenced by DES treatment) is a modulator of vitamin D metabolism along with other known regulators such as parathyroid hormone, phosphate, and 1alpha,25-(OH)2D3. The mechanism of the regulation is as yet unknown.

Original languageEnglish (US)
Pages (from-to)E338-343
JournalThe American journal of physiology
Volume235
Issue number3
StatePublished - Sep 1 1978

ASJC Scopus subject areas

  • Physiology (medical)

Fingerprint Dive into the research topics of 'Influence of estrogen on renal vitamin D hydroxylases and serum 1alpha,25-(OH)2D3 in chicks.'. Together they form a unique fingerprint.

  • Cite this