Document Detail

Rat ovarian angiotensin II receptors, renin, and angiotensin I-converting enzyme during pregnancy and the postpartum period.
MedLine Citation:
PMID:  1337275     Owner:  NLM     Status:  MEDLINE    
The ovarian renin-angiotensin system (RAS) has been studied extensively in the virgin cycling rat, but little information is available about this system in pregnant and postpartum rats. We show that renin and angiotensin I-converting enzyme (ACE)--the key enzymes involved in angiotensin II (Ang II) formation--and Ang II receptors, are present in pregnant and postpartum rat ovaries. From gestation Days 2-4 to 10-12, active ovarian renin ranged from 1.12 +/- 0.13 to 1.27 +/- 0.19 ng Ang I/h/mg and comprised between 68 and 86% of total (active+inactive) ovarian renin activity. Between Days 10-12 and Days 14-16 of pregnancy, ovarian active renin activity increased slightly, but inactive renin disappeared, suggesting its activation; the remaining active renin then decreased 62% by Days 18-20 (p < 0.05). On postpartum Day 2, both active and total ovarian renin activity exceeded that of Days 2-20 of pregnancy (p < 0.05); levels of both then declined sharply by postpartum Day 3 (p < 0.05). In pregnant rats, levels of ovarian Ang II receptors, identified by the specific binding of [125I]-[Sar1,Ile8]Ang II to ovarian membranes, were high between Days 2-4 and 10-12 of pregnancy, ranging from 12.8 +/- 1.7 to 15.7 +/- 3.4 fmol/mg, but steadily declined by 82% between gestation Days 10-12 and 18-20 (p < 0.05). Postpartum Ang II receptor levels on Days 2, 3, and 4 showed a gradual increase from low levels comparable to Days 18-20 of pregnancy. Ovarian ACE activity did not change throughout pregnancy or during the postpartum period.(ABSTRACT TRUNCATED AT 250 WORDS)
R B Howard; A Husain
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biology of reproduction     Volume:  47     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  1992 Dec 
Date Detail:
Created Date:  1993-03-10     Completed Date:  1993-03-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  925-30     Citation Subset:  IM    
Department of Heart and Hypertension Research, Research Institute of The Cleveland Clinic Foundation, Ohio 44195-5069.
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MeSH Terms
Ovary / metabolism*
Peptidyl-Dipeptidase A / biosynthesis*
Postpartum Period / metabolism*
Pregnancy, Animal / metabolism*
Rats, Sprague-Dawley
Receptors, Angiotensin / biosynthesis*
Renin / biosynthesis*
Time Factors
Grant Support
Reg. No./Substance:
0/Receptors, Angiotensin; EC A; EC

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