Pancreatic insulin content regulation by the estrogen receptor ER alpha.

Pancreatic insulin content regulation by the estrogen receptor ER alpha.
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雌激素受体ERα调节胰腺胰岛素含量。

DOI:
10.1371/journal.pone.0002069
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发表时间:
2008-04-30
期刊:
影响因子:
3.7
通讯作者:
Nadal, Angel
Nadal, Angel
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Alonso-Magdalena, Paloma;Ropero, Ana B.;Carrera, M. Pilar;Cederroth, Christopher R.;Baquie, Mathurin;Gauthier, Benoit R.;Nef, Serge;Stefani, Enrico;Nadal, Angel

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胰腺β细胞的功能是合成和释放胰岛素,胰岛素是参与血糖稳态的主要激素。雌激素受体ERα和ERβ是参与糖代谢的重要分子,但其在胰腺β细胞生理中的作用仍知之甚少。在本报告中,我们发现ERα和ERβ都存在于胰腺β细胞中。长期暴露于生理浓度的17β-雌二醇(E2)中增加了β细胞胰岛素含量、胰岛素基因表达和胰岛素释放,但胰腺β细胞质量没有改变。胰腺β细胞胰岛素含量的上调被环境相关剂量的广泛存在的内分泌干扰物双酚a (BPA)所模仿。使用ERα和ERβ激动剂以及ERα ko和ERβ ko小鼠提示参与的雌激素受体是ERα。ERα激活对胰腺胰岛素含量的上调涉及ERK1/2。这些数据可能对解释E2和环境雌激素在内分泌、胰腺功能和血糖稳态中的作用具有重要意义。
The function of pancreatic β-cells is the synthesis and release of insulin, the main hormone involved in blood glucose homeostasis. Estrogen receptors, ERα and ERβ, are important molecules involved in glucose metabolism, yet their role in pancreatic β-cell physiology is still greatly unknown. In this report we show that both ERα and ERβ are present in pancreatic β-cells. Long term exposure to physiological concentrations of 17β-estradiol (E2) increased β-cell insulin content, insulin gene expression and insulin release, yet pancreatic β-cell mass was unaltered. The up-regulation of pancreatic β-cell insulin content was imitated by environmentally relevant doses of the widespread endocrine disruptor Bisphenol-A (BPA). The use of ERα and ERβ agonists as well as ERαKO and ERβKO mice suggests that the estrogen receptor involved is ERα. The up-regulation of pancreatic insulin content by ERα activation involves ERK1/2. These data may be important to explain the actions of E2 and environmental estrogens in endocrine pancreatic function and blood glucose homeostasis.
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