Dose-dependent cardiac effect of oestrogen replacement in mice post-myocardial infarction.
Dose-dependent cardiac effect of oestrogen replacement in mice post-myocardial infarction.
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心肌梗塞后小鼠雌激素替代的剂量依赖性心脏效应。
DOI:
10.1113/expphysiol.2008.042788
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发表时间:
2008
影响因子:
2.7
通讯作者:
Yang,Xiao-Ping
中科院分区:
文献类型:
--
作者:
Zhan,Enbo;Keimig,Thomas;Xu,Jiang;Peterson,Edward;Ding,Jennifer;Wang,Fangfei;Yang,Xiao-Ping
Hormonal replacement therapy (HRT) has recently been shown to increase the risk of cardiovascular events in women. However, it is not clear whether the adverse effect of HRT is related to dosage and/or the presence of progestin. Using a mouse model of myocardial infarction (MI), we studied the dose‐effect of oestrogen replacement on mortality and cardiac remodelling and dysfunction post‐MI in the absence of progestin. Six‐week‐old females were subjected to ovariectomy (OVX). A pellet containing a low, moderate or high dose of 17β‐oestradiol (E2; 0.42, 4.2 or 18.8 μg day−1) or placebo was implanted subcutaneously on the day of OVX. Myocardial infarction was induced 8 weeks later, and cardiac morphology and function were evaluated 8 weeks after MI. We found that E2at moderate and high doses adversely affected mortality. A low dose of E2that restored plasma oestrogen close to physiological levels had no significant effect on mortality but tended to improve cardiac function and remodelling, associated with reduced fibrosis and increased capillary density. At the moderate dose, E2exacerbated cardiac fibrosis, hypertrophy, dysfunction and dilatation, associated with liver and kidney enlargement and ascites. Protein kinase C and extracellular signal‐regulated kinase were increased by MI but were not affected by E2. In summary, E2at a low dose tended to be cardioprotective. At increased doses that raised plasma oestrogen far beyond the physiological level, E2was detrimental to the heart. Our data suggest that dosage should be an important consideration when studying the effect of oestrogen replacement on the heart.
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DOI:
--
发表时间:
1983
期刊:
Journal of Physiology
影响因子:
--
作者:
R. Bridges;G. Nell;W. Rummel
通讯作者:
W. Rummel
影响因子:
2.9
作者:
Sariban-Sohraby,S;Benos,DJ
通讯作者:
Benos,DJ
影响因子:
--
作者:
B. Mannervik
通讯作者:
B. Mannervik
影响因子:
5
作者:
A. Cuthbert
通讯作者:
A. Cuthbert
DOI:
10.1016/0006-291x(86)90937-x
发表时间:
1986
影响因子:
3.1
作者:
P. Barbry;C. Frelin;P. Vigne;E. Cragoe;M. Lazdunski
通讯作者:
M. Lazdunski