Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice.

Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Research Abstract Details 

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Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Abstract Text:

Baojian Xue,Jaya Pamidimukkala,Dennis B Lubahn,Meredith Hay,

It has been shown that the female sex hormones have a protective role in the development of angiotensin II (ANG II)-induced hypertension. The present study tested the hypotheses that 1) the estrogen receptor-alpha (ERalpha) is involved in the protective effects of estrogen against ANG II-induced hypertension and 2) central ERs are involved. Blood pressure (BP) was measured in female mice with the use of telemetry implants. ANG II (800 ng.kg(-1).min(-1)) was administered subcutaneously via an osmotic pump. Baseline BP in the intact, ovariectomized (OVX) wild-type (WT) and ERalpha knockout (ERalphaKO) mice was similar; however, the increase in BP induced by ANG II was greater in OVX WT (23.0 +/- 1.0 mmHg) and ERalphaKO mice (23.8 +/- 2.5 mmHg) than in intact WT mice (10.1 +/- 4.5 mmHg). In OVX WT mice, central infusion of 17beta-estradiol (E(2); 30 microg.kg(-1).day(-1)) attenuated the pressor effect of ANG II (7.0 +/- 0.4 mmHg), and this protective effect of E(2) was prevented by coadministration of ICI-182,780 (ICI; 1.5 microg.kg(-1).day(-1), 18.8 +/- 1.5 mmHg), a nonselective ER antagonist. Furthermore, central, but not peripheral, infusions of ICI augmented the pressor effects of ANG II in intact WT mice (17.8 +/- 4.2 mmHg). In contrast, the pressor effect of ANG II was unchanged in either central E(2)-treated OVX ERalphaKO mice (19.0 +/- 1.1 mmHg) or central ICI-treated intact ERalphaKO mice (19.6 +/- 1.6 mmHg). Lastly, ganglionic blockade on day 7 after ANG II infusions resulted in a greater reduction in BP in OVX WT, central ER antagonist-treated intact WT, central E(2) + ICI-treated OVX WT, ERalphaKO, and central E(2)- or ICI-treated ERalphaKO mice compared with that in intact WT mice given just ANG II. Together, these data indicate that ERalpha, especially central expression of the ER, mediates the protective effects of estrogen against ANG II-induced hypertension.

Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Publishing Authors By Initials

B Xue,J Pamidimukkala,DB Lubahn,M Hay,

For similar chemical actions and uses: pharmacologic actions: therapeutic uses: cardiovascular agents: vasoconstrictor agents research abstracts see: chemical actions and uses: pharmacologic actions: therapeutic uses: cardiovascular agents: vasoconstrictor agents research

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Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: American journal of physiology. Heart and circulat

VOLUME: 292

Page Numbers: H1770-6

Journal Abbreviation:

ISSN: 0363-6135

DAY: 1

MONTH: 12

YEAR: 2006

Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 100901228

Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Keywords Mesh Terms:

KEYWORDS: Vasoconstrictor Agents

MESH TERMS: pharmacology

Chemical & Substance for Abstract: Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice. Information

Substance Name: Estradiol

Registry Number: 50-28-2

Grant and Affiliation Information for Estrogen receptor-alpha mediates estrogen protection from angiotensin II-induced hypertension in conscious female mice.

AFFILIATION: Department of Physiology, University of Iowa, Iowa City, Iowa 52242, USA. baojian-xue@uiowa.edu

Country: United States

AGENCY: United States NHLBI

GRANT: HL-62261

ACRONYM: HL

MEDLINETA: Am J Physiol Heart Circ Physio

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