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• W2045907419 abstract "Recent studies describing the seemingly contradictory actions of estrogens in ischemic stroke injury have led us to reevaluate the circumstances under which estrogen therapy (ET) provides benefits against cerebral stroke and decipher its mechanisms of action. One prominent feature that follows stroke injury is massive central and peripheral inflammatory responses. Evidence now suggests that postischemic inflammatory responses strongly contribute to the extent of brain injury, and 17beta-estradiol (E(2)) may protect the ischemic brain by exerting antiinflammatory actions. In an attempt to explain recently reported dichotomous effects of E(2) in stroke injury, we tested the hypothesis that an extended period of hypoestrogenicity both prevents E(2) from protecting the brain against ischemia and simultaneously suppresses its antiinflammatory actions. We report that E(2) exerts profound neuroprotective action when administered immediately upon ovariectomy, but not when administered after 10 weeks of hypoestrogenicity. Consistently, E(2) treatment given immediately at the time of ovariectomy attenuated central and peripheral production of proinflammatory cytokines after ischemic stroke. In contrast, E(2) did not suppress production of proinflammatory molecules when it was administered after 10 weeks postovariectomy. These results demonstrate that a prolonged period of hypoestrogenicity disrupts both neuroprotective and antiinflammatory actions of E(2). Our findings may help to explain the results of the Women's Health initiative that reported no beneficial effect of ET against stroke because the majority of the subjects initiated ET after an extended period of hypoestrogenicity." @default.
• W2045907419 created "2016-06-24" @default.
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• W2045907419 date "2007-04-03" @default.
• W2045907419 modified "2023-09-27" @default.
• W2045907419 title "Timing of estrogen therapy after ovariectomy dictates the efficacy of its neuroprotective and antiinflammatory actions" @default.
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• W2045907419 doi "https://doi.org/10.1073/pnas.0610394104" @default.
• W2045907419 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1851608" @default.
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