期刊
BRAIN RESEARCH
卷 1010, 期 1-2, 页码 22-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2004.02.066
关键词
estrogen; estrogen receptor; PPT; DPN; neuroprotection; Bcl-2
资金
- NIA NIH HHS [P01 AG1475] Funding Source: Medline
- NIMH NIH HHS [R01 MH67159] Funding Source: Medline
Estrogen receptor (ER) mediated neuroprotection has been demonstrated in both in vitro and in vivo model systems. However, the relative contribution by either ER subtype, ERalpha or ERbeta, to estrogen-induced neuroprotection remains unresolved. To address this question, we investigated the impact of selective ER agonists for either ERalpha, PPT, or ERbeta, DPN, to prevent neurodegeneration in cultured hippocampal neurons exposed to excitotoxic glutamate. Using three indicators of neuronal viability and survival, we demonstrated that both the ERalpha selective agonist PPT and the ERbeta selective agonist DPN protected hippocampal neurons against glutamate-induced cell death in a dose-dependent manner, with the maximal response occurring at 100 pM. Further analyses showed that both PPT and DPN enhanced Bcl-2 expression in hippocampal neurons, with an efficacy comparable to their neuroprotective capacity. Collectively, the present data indicate that activation of either ERalpha or ERbeta can promote neuroprotection in hippocampal neurons, suggesting that both receptor subtypes could be involved in estrogen neuroprotection. As ER is highly expressed in the brain and has little or no expression in the breast or uterus, discovery and design of ERbeta selective molecules could provide a strategy for activating the beneficial effects of estrogen in the brain without activating untoward effects of estrogen in reproductive organs. (C) 2004 Elsevier B.V. All rights reserved.
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