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17 beta-estradiol attenuates pressure overload-induced myocardial hypertrophy through regulating caveolin-3 protein in ovariectomized female rats.

Authors: Cui, YH  Tan, Z  Fu, XD  Xiang, QL  Xu, JW  Wang, TH 
Citation: Cui YH, etal., Mol Biol Rep. 2011 Nov;38(8):4885-92. Epub 2010 Dec 18.
Pubmed: (View Article at PubMed) PMID:21170593
DOI: Full-text: DOI:10.1007/s11033-010-0630-0

Our findings indicate that in ovariectomized female rats abdominal aortic constriction led to significant increases in left ventricular mass, myocyte diameter and heart weight/body weight (HW/BW) value, and decreases in interventricular septal thickness at diastole (IVSd), left ventricular percent fractional shortening (FS) and ejection fraction (EF). These pathophysiological alterations were largely reversed by administration with 17beta-estradiol for eight weeks. Furthermore, the enhanced expression of extracellular signal-regulated kinases 1/2 and decreased expression of caveolin-3 were found in left ventricle of AAC group. 17beta-estradiol (E(2)) administration increased the expression of caveolin-3 and reduced the level of ERK phosphorylation in these pressure-overloaded rats. Moreover, in cultured neonatal rat cardiomyocytes, E(2) inhibited the hypertrophic response to angiotensin II. This effect was reinforced by the addition of extracellular signal-regulated kinases 1/2 inhibitor PD98059, but was impaired when the cells were pretreated with caveolae disruptor, methyl-beta-cyclodextrin (M-beta-CD). In conclusion, our data indicate that estrogen attenuates the hypertrophic response induced by pressure overload through down-regulation of extracellular signal-regulated kinases 1/2 phosphorylation and up-regulation of caveolin-3 expression.

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CRRD Object Information
CRRD ID: 6784534
Created: 2012-08-02
Species: All species
Last Modified: 2012-08-02
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.