PMID: 9171950Jun 1, 1997Paper

Effects of 17 beta-oestradiol on vascular responses in the in situ blood-perfused mesentery of Wistar-Kyoto rats

Clinical and Experimental Pharmacology & Physiology
Z M Chu, L J Beilin

Abstract

1. To determine whether endogenous oestrogen plays a role in pregnancy induced decreased vascular reactivity we have examined the effects of 17 beta-oestradiol on vasoconstrictor responses to various stimuli using an in situ blood-perfused mesenteric vascular preparation in Wistar-Kyoto (WKY) rats. 2. Daily administration of 17 beta-oestradiol (500 micrograms/kg, s.c.) for 15 days significantly enhanced mesenteric vasoconstrictor responses to noradrenaline (NA), without affecting responses to the electrical stimulation of sympathetic nerves (ES) and angiotensin II (AngII). 3. Nitric oxide (NO) synthesis inhibition by nitro-L-arginine methyl ester (L-NAME; 100 mg/kg, i.v.) significantly potentiated mesenteric vasoconstrictor responses to all stimuli in both 17 beta-oestradiol-treated and control animals. The difference in NA responses between groups was diminished following NO synthesis inhibition. 4. These findings do not support the hypothesis that increased endogenous oestrogen plays a role in decreased mesenteric vascular reactivity in pregnancy. However, responses to oestrogen may be dose-dependent and enhancement of vasoconstrictor responses to NA may be relevant to oral contraceptive-induced hypertension.

References

Mar 1, 1988·Hypertension·J W Woods
May 24, 1994·Proceedings of the National Academy of Sciences of the United States of America·C P WeinerS Moncada
Sep 1, 1994·American Journal of Obstetrics and Gynecology·C P WeinerS Moncada

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Citations

Jul 19, 2008·American Journal of Hypertension·Douglas S MartinKathleen M Eyster
Sep 9, 2000·Journal of Neurophysiology·Z Li, M Hay
Oct 3, 2002·Hypertension Research : Official Journal of the Japanese Society of Hypertension·Naoyoshi MinamiMasahiro Kohzuki

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