Rapid, nongenomic estrogen actions protect pancreatic islet survival.

Rapid, nongenomic estrogen actions protect pancreatic islet survival.
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DOI:
10.4161/isl.1.3.9781
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发表时间:
2009-11
期刊:
影响因子:
2.2
通讯作者:
Mauvais-Jarvis F
Mauvais-Jarvis F
中科院分区:
医学4区
文献类型:
--
作者:
Liu S;Mauvais-Jarvis F

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性腺类固醇,17β-雌二醇(E2),作为一种保护性激素,在体内防止两种性别小鼠以及培养的小鼠和人胰岛中的β细胞凋亡。E2通过经典的雌激素受体(ER)α和ERβ(ERα的双核形式)和G蛋白偶联雌激素受体(GPER)传递信号。在最近的一项研究中,我们确定了这些受体对β细胞存活的贡献,在小鼠和培养的小鼠和人类胰岛中使用遗传和药理学工具的组合。我们发现,E2通过ERα和ERβ通过非依赖性的、核外机制和主要的ERα效应阻止细胞凋亡,从而有利于胰岛存活。我们还发现,E2通过GPER依赖的机制防止细胞凋亡。在这里,我们表明,E2防止细胞凋亡独立的基因转录或从头蛋白质的合成表明,E2细胞保护发生独立的核事件。此外,我们报告E2胰岛细胞保护作用可被非雌性化E2立体异构体17α-雌二醇模拟,表明其部分非雌激素受体介导。这些研究确定了新的雌激素途径和目标,以保护胰岛的生存。
The gonadal steroid, 17β-estradiol (E2), acts as a protective hormone preventing β-cell apoptosis in vivo in mice of both sexes and in cultured mouse and human islets. E2 signals via the classical estrogen receptor (ER)α and ERβ, an extranuclear form of ERα and the G protein-coupled estrogen receptor (GPER). In a recent study, we determined the contribution of these receptors to β-cell survival, using a combination of genetic and pharmacological tools in mice and cultured mouse and human islets. We showed that E2 favors islet survival by preventing apoptosis via ERα and ERβ through ERE-independent, extra-nuclear mechanisms and with a predominant ERα effect. We also revealed that E2 prevents apoptosis via GPER-dependent mechanisms. Here, we show that E2 prevents apoptosis independently of gene transcription or de novo protein synthesis suggesting that E2 cytoprotection happens independently of nuclear events. Furthermore, we report that E2 islet cytoprotection can be mimicked by the nonfeminizing E2 stereoisomer, 17α-estradiol, suggesting that it is partially non-estrogen receptor mediated. These studies identify novel estrogen pathways and targets to protect islet survival.
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