Importance of extranuclear estrogen receptor-alpha and membrane G protein-coupled estrogen receptor in pancreatic islet survival.

Importance of extranuclear estrogen receptor-alpha and membrane G protein-coupled estrogen receptor in pancreatic islet survival.
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DOI:
10.2337/db09-0257
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发表时间:
2009-10
期刊:
影响因子:
7.7
通讯作者:
Mauvais-Jarvis F
Mauvais-Jarvis F
中科院分区:
医学1区
文献类型:
--
作者:
Liu S;Le May C;Wong WP;Ward RD;Clegg DJ;Marcelli M;Korach KS;Mauvais-Jarvis F

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我们发现17β-雌二醇(E2)通过雌激素受体-α (ERα)促进小鼠胰腺β细胞存活。E2通过雌激素反应元件(ERE)激活核雌激素受体。E2还通过核外形式的ERα和G蛋白偶联雌激素受体(GPER)激活非基因组信号。我们研究了雌激素受体对胰岛存活的贡献。我们使用缺乏雌激素受体-α (αERKO−/−)、雌激素受体-β (βERKO−/−)、雌激素受体-α和雌激素受体-β (αβERKO−/−)和GPER (GPERKO−/−)的小鼠和胰岛;缺乏ERα与ERE结合的小鼠;还有人类的胰岛。结合受体特异性药理探针对这些小鼠和胰岛进行了研究。我们发现ERα对胰岛存活的保护是与ERE无关的,E2通过核外和膜雌激素受体信号传导促进胰岛存活。我们发现,与ERα相比,ERβ具有较小的细胞保护作用。因此,βERKO−/−小鼠轻度倾向于链脲佐菌素诱导的胰岛凋亡。然而,在小鼠中,联合消除ERα和ERβ不会协同引起胰岛细胞凋亡。在αβERKO−/−小鼠及其胰岛中,E2可部分阻止细胞凋亡,这表明另一种途径可补偿ERα/ERβ缺乏。我们发现E2对胰岛存活的保护作用可通过非膜性E2制剂和选择性GPER激动剂再现。因此,GPERKO−/−小鼠易受链脲佐菌素诱导的胰岛素缺乏的影响。E2通过ERα和ERβ通过ere不依赖、核外机制和gper依赖机制保护β细胞存活。本研究为β细胞中的雌激素生物学增加了一个新的维度,并确定了GPER作为保护胰岛存活的靶点。
We showed that 17β-estradiol (E2) favors pancreatic β-cell survival via the estrogen receptor-α (ERα) in mice. E2 activates nuclear estrogen receptors via an estrogen response element (ERE). E2 also activates nongenomic signals via an extranuclear form of ERα and the G protein–coupled estrogen receptor (GPER). We studied the contribution of estrogen receptors to islet survival. We used mice and islets deficient in estrogen receptor-α (αERKO−/−), estrogen receptor-β (βERKO−/−), estrogen receptor-α and estrogen receptor-β (αβERKO−/−), and GPER (GPERKO−/−); a mouse lacking ERα binding to the ERE; and human islets. These mice and islets were studied in combination with receptor-specific pharmacological probes. We show that ERα protection of islet survival is ERE independent and that E2 favors islet survival through extranuclear and membrane estrogen receptor signaling. We show that ERβ plays a minor cytoprotective role compared to ERα. Accordingly, βERKO−/− mice are mildly predisposed to streptozotocin-induced islet apoptosis. However, combined elimination of ERα and ERβ in mice does not synergize to provoke islet apoptosis. In αβERKO−/− mice and their islets, E2 partially prevents apoptosis suggesting that an alternative pathway compensates for ERα/ERβ deficiency. We find that E2 protection of islet survival is reproduced by a membrane-impermeant E2 formulation and a selective GPER agonist. Accordingly, GPERKO−/− mice are susceptible to streptozotocin-induced insulin deficiency. E2 protects β-cell survival through ERα and ERβ via ERE-independent, extra-nuclear mechanisms, as well as GPER-dependent mechanisms. The present study adds a novel dimension to estrogen biology in β-cells and identifies GPER as a target to protect islet survival.
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发表时间: 2009-02-01
期刊: ENDOCRINOLOGY
影响因子: 4.8
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发表时间: 2006-06-13
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DOI: 10.1096/fasebj.12.13.1341
发表时间: 1998-10-01
期刊: FASEB JOURNAL
影响因子: 4.8
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