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Citations to this article

In vitro prostacyclin production by ovine uterine and systemic arteries. Effects of angiotensin II.
R R Magness, … , M D Mitchell, C R Rosenfeld
R R Magness, … , M D Mitchell, C R Rosenfeld
Published December 1, 1985
Citation Information: J Clin Invest. 1985;76(6):2206-2212. https://doi.org/10.1172/JCI112229.
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Research Article

In vitro prostacyclin production by ovine uterine and systemic arteries. Effects of angiotensin II.

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Abstract

Normal pregnancy is associated with reduced systemic pressor responses to infused angiotensin II (ANG II); furthermore, the uterine vascular bed is even less responsive to vasoconstriction by ANG II than the systemic vasculature overall. The mechanism(s) for this refractoriness remains unknown. To determine if vessel production of prostacyclin may be responsible, uterine and omental artery segments were obtained from four groups of sheep, nonpregnant (NP), pregnant (P; 131 +/- 4 d), early postpartum (2.2 +/- 0.4 d), and late postpartum (16 +/- 2 d), and incubated in Krebs-Henseleit alone or with ANG II in the absence or presence of Saralasin. Prostacyclin was measured as 6-keto-prostaglandin F1 alpha (6-keto-PGF1 alpha). Synthesis of 6-keto-PGF1 alpha was de novo, since aspirin inhibited its formation. P and early uterine arteries produced more 6-keto-PGF1 alpha than NP and late vessels (P less than 0.05): 386 +/- 60 (X +/- SE) and 175 +/- 23 vs. 32 +/- 5 and 18 +/- 4 pg/mg X h, respectively. A similar relationship was observed for omental arteries: 101 +/- 14 and 74 +/- 14 vs. 36 +/- 10 and 22 +/- 4 pg/mg X h, respectively. Furthermore, synthesis by arteries from P and early animals was greater in uterine than omental vessels (P less than 0.05); this was not observed in NP or late vessels. ANG II increased 6-keto-PGF1 alpha production 107 +/- 20% and 92 +/- 16% in P and early uterine arteries only; the threshold dose was between 5 X 10(-11) and 5 X 10(-9) M ANG II. This ANG II-induced increase in 6-keto-PGF1 alpha by uterine arteries was inhibited by Saralasin, which by itself had no effect. During pregnancy, the reduced systemic pressor response to ANG II and the even greater refractoriness of the uterine vascular bed may be reflective of vessel production of the potent vasodilator, prostacyclin. Furthermore, in the uterine vasculature, this antagonism may be potentiated by specific ANG II receptor-mediated increases in prostacyclin.

Authors

R R Magness, K Osei-Boaten, M D Mitchell, C R Rosenfeld

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Total citations by year

Year: 2021 2019 2018 2017 2016 2014 2013 2012 2009 2008 2007 2005 2004 2001 2000 1999 1998 1997 1995 1994 1993 1992 1991 1990 1989 1988 1986 Total
Citations: 1 1 1 1 2 1 1 2 3 2 1 4 2 1 3 2 5 4 2 8 5 7 9 5 2 2 1 78
Citation information
This citation data is accumulated from CrossRef, which receives citation information from participating publishers, including this journal. Not all publishers participate in CrossRef, so this information is not comprehensive. Additionally, data may not reflect the most current citations to this article, and the data may differ from citation information available from other sources (for example, Google Scholar, Web of Science, and Scopus).

Citations to this article in year 2014 (1)

Title and authors Publication Year
Prolonged uterine artery nitric oxide synthase inhibition modestly alters basal uteroplacental vasodilation in the last third of ovine pregnancy
CR Rosenfeld, T Roy
American journal of physiology. Heart and circulatory physiology 2014

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