Effects of estradiol on aldosterone secretion in ovariectomized rats

Mei Mei Kau, Ming Jae Lo, Shiow Chwen Tsai, Jiann Jong Chen, Chien Chen Lu, Ho Lin, Shyi Wu Wang, Paulus S. Wang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The effects and action mechanisms of estradiol on aldosterone secretion in female rats were studied. Replacement of estradiol benzoate (EB) increased the levels of plasma estradiol and aldosterone in ovariectomized (Ovx) rats. The aldosterone release from zona glomerulosa (ZG) cells was higher in EB- treated rats than in oil-treated animals. EB treatment potentiated the responses of aldosterone release to adrenocorticotropic hormone (ACTH), forskolin (FSK), and 8-bromoadenosine 3', 5'-cyclic monophosphate (8-Br- cAMP). Administration of EB in vivo did not alter cAMP production in response to ACTH or FSK. Although angiotensin II (Ang II) increased aldosterone secretion by rat ZG cells, the stimulatory effect of Ang II on the release of aldosterone was not altered by EB treatment. The conversions of [3H]- deoxycorticosterone to [3H]-corticosterone and [3H]-corticosterone to [3H]-aldosterone in EB-treated groups were greater than those in the oil- treated group. These results suggest that estradiol increases aldosterone secretion in part through the mechanisms involving the activation of the post-cAMP pathway, 11β-hydroxylase and aldosterone synthase activity.

Original languageEnglish (US)
Pages (from-to)137-144
Number of pages8
JournalJournal of Cellular Biochemistry
Volume73
Issue number1
DOIs
StatePublished - Apr 1 1999

Keywords

  • ACTH
  • Ang II
  • Rat
  • Steroidogenesis
  • ZG cells

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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