Neuroprotective action of acute estrogens: animal models of brain ischemia and clinical implications.

Neuroprotective action of acute estrogens: animal models of brain ischemia and clinical implications.
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DOI:
10.1016/j.steroids.2012.12.015
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发表时间:
2013-06
期刊:
影响因子:
2.7
通讯作者:
Etgen AM
Etgen AM
中科院分区:
医学3区
文献类型:
--
作者:
Inagaki T;Etgen AM

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卵巢激素17β-雌二醇(E2)在啮齿动物全脑和局灶性缺血模型中对缺血诱导的脑损伤发挥了深刻的神经保护作用。这篇评论的重点是缺血后管理E2和非女性化雌激素类似物在衰老的大脑中的神经保护作用,重点是在动物的研究进行了长期的循环E2的损失。在这种情况下,讨论了妇女健康倡议研究的临床结果以及使用长期生理水平E2治疗的动物研究数据。我们总结了主要发表的研究结果,强调有效剂量和时间的E2治疗相对于缺血发作。然后,我们讨论了我们实验室最近的研究结果表明,在某些条件下,老化的海马仍然对E2和一些神经保护性的非女性化雌激素类似物敏感,即使在长时间的激素戒断后。可能的膜启动的信号传导机制,可能是急性管理E2的神经保护作用的基础进行了讨论。基于这些发现,我们认为,缺血后治疗与高剂量的E2或某些非女性化的雌激素类似物可能有很大的治疗潜力,治疗脑损伤和神经退行性病变与缺血。
The ovarian hormone 17β-estradiol (E2) exerts profound neuroprotective actions against ischemia-induced brain damage in rodent models of global and focal ischemia. This review focuses on the neuroprotective efficacy of post-ischemic administration of E2 and non-feminizing estrogen analogs in the aging brain, with an emphasis on studies in animals subjected to a long-term loss of circulating E2. Clinical findings from the Women’s Health Initiative study as well as data from animal studies that used long-term, physiological levels of E2 treatment are discussed in this context. We summarize major published findings that highlight the effective doses and timing of E2 treatment relative to onset of ischemia. We then discuss recent findings from our laboratory showing that under some conditions the aging hippocampus remains responsive to E2 and some neuroprotective non-feminizing estrogen analogs even after prolonged periods of hormone withdrawal. Possible membrane-initiated signaling mechanisms that may underlie the neuroprotective actions of acutely administered E2 are also discussed. Based on these findings, we suggest that post-ischemic treatment with high doses of E2 or certain non-feminizing estrogen analogs may have great therapeutic potential for treatment of brain damage and neurodegeneration associated with ischemia.
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