Estrogen Can Act via Estrogen Receptor (cid:1) and (cid:2) to Protect Hippocampal Neurons against Global Ischemia-Induced Cell Death

Estrogen Can Act via Estrogen Receptor (cid:1) and (cid:2) to Protect Hippocampal Neurons against Global Ischemia-Induced Cell Death
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DOI:
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发表时间:
2005
影响因子:
1.1
通讯作者:
N. R. Miller;T. Jover;Hillel W. Cohen;R. Zukin;A. M. Etgen
N. R. Miller;T. Jover;Hillel W. Cohen;R. Zukin;A. M. Etgen
中科院分区:
数学3区
文献类型:
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作者:
N. R. Miller;T. Jover;Hillel W. Cohen;R. Zukin;A. M. Etgen

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在局灶性和整体缺血的实验模型中,生理浓度的雌二醇可干预细胞凋亡级联并改善神经元死亡。然而,在整体缺血中介导雌二醇保护海马神经元的细胞靶标尚不清楚。本研究检验了雌二醇通过雌激素受体(ER)(cid:1)和/或(cid:2)保护去势大鼠海马神经元的假设。雌二醇(14 d 预处理)对 CA1 神经元提供强大的保护,防止全局缺血引起的死亡。广谱 ER 拮抗剂 ICI182,780(脑室内,缺血后 0 和 12 小时)消除雌激素保护,与 ER 的作用一致。评估 ER (cid:1) 与 ER (cid:2) 在雌激素中的潜在作用为了保护,我们在缺血前14天和缺血后7天给予亚型选择性激动剂。 ER (cid:1) -选择性激动剂丙基吡唑三醇(PPT,10 mg/kg)和 ER (cid:2) -选择性激动剂 WAY 200070–3 (1 mg/kg) 对约 50% 的动物产生几乎完全的 CA1 神经元保护。 PPT(而非 WAY 200070-3)在用于保护的剂量下会引起脊柱前凸、诱导 LH 释放的负反馈抑制以及体重增加减少。这些发现证实了 PPT 剂量在神经内分泌测定中的功效以及 WAY200070-3 对于 ER (cid:2) 的特异性。我们还检查了雌二醇和神经元损伤调节 ER (cid:1) 和 ER (cid:2) 表达的能力。雌二醇和全脑缺血均显着增加 ER (cid:1),但不增加 ER (cid:2) 和 CA1 中的蛋白。这些数据表明,雌二醇可通过 ER (cid:1) 和 ER (cid:2) 保护 CA1 神经元免受全脑缺血诱导的死亡,并且雌二醇和全脑缺血均调节海马 CA1 中 ER (cid:1) 的表达。 En- 独立生理学表现的特异性
Estradiol at physiological concentrations intervenes in apo- ptotic death cascades and ameliorates neuronal death in experimental models of focal and global ischemia. The cellular targets that mediate estradiol protection of hippocampal neurons in global ischemia are, however, unclear. The present study examined the hypothesis that estradiol protects hippocampal neurons in ovariectomized rats via estrogen recep- tor (ER) (cid:1) and/or (cid:2) . Estradiol (14 d pretreatment) afforded robust protection of CA1 neurons against global ischemia-induceddeath.Thebroad-spectrumERantagonistICI182,780(intracerebroventricularly,0and12hafterischemia)abol-ishedestrogenprotection,consistentwitharoleforERs.ToevaluatethepotentialrolesofER (cid:1) vs. ER (cid:2) in estrogen pro- tection, we administered subtype-selective agonists for 14 d before and 7 d after ischemia. The ER (cid:1) -selective agonist propyl pyrazole triol (PPT, 10 mg/kg) and ER (cid:2) -selective agonist WAY 200070–3 (1 mg/kg) produced nearly complete protection of CA1 neurons in approximately 50% of the animals. PPT, but not WAY 200070–3, at doses used for protection, elicited lor-dosis,inducednegativefeedbackinhibitionofLHrelease,andreducedweightgain.ThesefindingsestablishtheefficacyofthePPTdoseinneuroendocrineassaysandspecificityofWAY200070–3forER (cid:2) . We also examined the ability of estradiol and neuronal injury to regulate ER (cid:1) and ER (cid:2) expression. Both estradiol and global ischemia markedly increased ER (cid:1) , butnotER (cid:2) ,proteininCA1.Thesedataindicatethatestradiol can act via ER (cid:1) and ER (cid:2) to protect CA1 neurons from global ischemia-induced death and that both estradiol and global ischemia modulate ER (cid:1) expression in hippocampal CA1. En- the specificity performed independent physiological