Cited by 22Renin-Angiotensin System StudiesReproductive Biology and FertilityOvarian function and disorders

Role of the angiotensin II system in regulation of ovulation and blood flow in the rat ovary

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Mitsube, K, Mikuni, M, Matousek, M, Zackrisson, U, Brannstrom, M·2003·Reproduction

Abstract

The aim of the present study was to examine the roles of the angiotensin II receptor subtypes, AT(1) and AT(2), in ovulation, and to evaluate the contribution of angiotensin II-mediated pathways in regulation of ovarian blood flow. The AT(1)-specific antagonist, losartan, was administered alone or in combination with the AT(2)-specific antagonist, PD123319, to preovulatory rat ovaries perfused in vitro. Losartan (100 micromol l(-1)) did not affect the number of ovulations, whereas the combination of losartan (100 micromol l(-1)) and PD123319 (10 micromol l(-1)) inhibited ovulation. The angiotensin II antagonists did not affect the ovarian production of oestradiol, progesterone, prostaglandin E(2) (PGE(2)), PGF(2 alpha) or plasminogen activator activity. Ovarian nitric oxide production was inhibited by losartan. Ovarian blood flow was measured by laser Doppler flowmetry in vivo in preovulatory rat ovaries. Intrabursal injection of angiotensin II reduced ovarian blood flow of gonadotrophin-stimulated rats. Losartan had no effect on basal ovarian blood flow but completely blocked the angiotensin II-induced reduction. In contrast, treatment with PD123319 increased basal ovarian blood flow and failed to reverse the effect of exogenously administered angiotensin II, indicating that under physiological conditions, ovarian blood flow of the rat is negatively regulated by angiotensin II mainly through the action of AT(2). Taken together, these results indicate that two different types of angiotensin II receptor facilitate ovulation by cooperative mechanisms and that they regulate ovarian blood flow in a different manner.

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Crossref · 10.1530/rep.0.1250425

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Authors
Mitsube, K., Mikuni, M., Matousek, M., Zackrisson, U., & Brannstrom, M.
Affiliations
  • Hokkaido University (JP)
  • University of Gothenburg (SE)
Venue
Reproduction
Published
2003-03-01
Volume
125
Issue
3
Pages
425-435
ISSN
  • 1470-1626 (ISSN-L)
  • 1741-7899
OpenAlex
W2148582752
Cited by
22
References
36
Citations by year
2025: 2 · 2024: 2 · 2023: 1 · 2021: 1 · 2018: 1 · 2013: 2
FWCI
0.44
Type
journal article
Language
en
Open access
Locations
  • Reproduction (publishedVersion)
  • PubMed (publishedVersion)
Funders
Medical Research Council
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Biology and Fertility
  • Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
Keywords
angiotensin II, ovulation, ovarian blood flow, losartan, PD123319, nitric oxide, estradiol, progesterone, prostaglandins, plasminogen activator, rats
MeSH terms
Angiotensin II, Animals, Drug Synergism, Female, Imidazoles, Ovary, Ovulation, Plasminogen Activators, Pyridines, Regional Blood Flow, Dinoprostone, Laser-Doppler Flowmetry, Rats, Sprague-Dawley, Losartan, Rats, Angiotensin Receptor Antagonists

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