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
Yang,Xiao-Ping
中科院分区:
医学4区
文献类型:
--
作者:
Zhan,Enbo;Keimig,Thomas;Xu,Jiang;Peterson,Edward;Ding,Jennifer;Wang,Fangfei;Yang,Xiao-Ping

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激素替代疗法(HRT)最近被证明会增加女性心血管事件的风险。然而,目前尚不清楚HRT的不良反应是否与黄体酮的剂量和/或存在有关。使用小鼠心肌梗死(MI)模型,我们研究了在没有黄体酮的情况下,雌激素替代对心肌梗死后死亡率、心脏重构和功能障碍的剂量效应。6周大的女性接受卵巢切除术(OVX)。在OVX当天皮下植入含有低、中、高剂量17β -雌二醇(E2; 0.42、4.2或18.8 μg day - 1)或安慰剂的微丸。8周后诱导心肌梗死,心肌梗死后8周评估心肌形态学和功能。我们发现中剂量和高剂量e2对死亡率有不利影响。低剂量e2使血浆雌激素恢复到接近生理水平,但对死亡率没有显著影响,但倾向于改善心功能和重构,与纤维化减少和毛细血管密度增加有关。在中等剂量下,e2加重了心脏纤维化、肥厚、功能障碍和扩张,并伴有肝肾肿大和腹水。蛋白激酶C和细胞外信号调节激酶因心肌梗死而升高,但不受E2的影响。综上所述,低剂量的e2具有保护心脏的作用。如果增加剂量,使血浆雌激素远远超过生理水平,e2对心脏有害。我们的数据表明,在研究雌激素替代对心脏的影响时,剂量应该是一个重要的考虑因素。
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.
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
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期刊: Biochemistry
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发表时间: 1973
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DOI: 10.1016/0006-291x(86)90937-x
发表时间: 1986
影响因子: 3.1
作者:
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