Metformin protects against intestinal barrier dysfunction via AMPKα1-dependent inhibition of JNK signalling activation.

Metformin protects against intestinal barrier dysfunction via AMPKα1-dependent inhibition of JNK signalling activation.
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二甲双胍通过 AMPK α 1 依赖性抑制 JNK 信号激活来防止肠道屏障功能障碍

DOI:
10.1111/jcmm.13342
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发表时间:
2018-01
影响因子:
5.3
通讯作者:
Chen Y
Chen Y
中科院分区:
医学2区
文献类型:
--
作者:
Deng J;Zeng L;Lai X;Li J;Liu L;Lin Q;Chen Y

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肠上皮屏障的破坏,涉及C-Jun N-末端激酶(JNK)的激活,有助于启动和加速炎症性肠病的炎症。除了降糖作用外,二甲双胍还具有意想不到的有益作用。在这里,我们提供了二甲双胍可以预防结肠炎肠屏障功能障碍的证据。我们发现二甲双胍可缓解葡聚糖硫酸钠(DSS)诱导的跨上皮电阻降低、FITC-葡聚糖高渗透性、紧密连接(TJ)蛋白occludin和ZO-1丢失以及Caco-2细胞单层或结肠炎小鼠模型中的细菌易位。二甲双胍还改善了溃疡性结肠炎合并2型糖尿病患者中TJ蛋白的表达。我们发现二甲双胍改善了结肠炎的诱导,并降低了促炎细胞因子IL-6、TNF-α和IL-1β的水平。此外,二甲双胍抑制DSS诱导的JNK活化,这是一种依赖于AMP活化蛋白激酶α1(AMPKα1)活化的效应。与这一发现一致,二甲双胍在DSS给药后不能维持AMPKα1沉默细胞单层的屏障功能。这些发现强调了二甲双胍对肠屏障功能障碍的保护作用。其潜在机制可能涉及通过AMPKα1依赖性信号通路抑制JNK活化。
Disruption of the intestinal epithelial barrier, that involves the activation of C‐Jun N‐terminal kinase (JNK), contributes to initiate and accelerate inflammation in inflammatory bowel disease. Metformin has unexpected beneficial effects other than glucose‐lowering effects. Here, we provided evidence that metformin can protect against intestinal barrier dysfunction in colitis. We showed that metformin alleviated dextran sodium sulphate (DSS)‐induced decreases in transepithelial electrical resistance, FITC‐dextran hyperpermeability, loss of the tight junction (TJ) proteins occludin and ZO‐1 and bacterial translocation in Caco‐2 cell monolayers or in colitis mice models. Metformin also improved TJ proteins expression in ulcerative colitis patients with type 2 diabetes mellitus. We found that metformin ameliorated the induction of colitis and reduced the levels of pro‐inflammatory cytokines IL‐6, TNF‐a and IL‐1β. In addition, metformin suppressed DSS‐induced JNK activation, an effect dependent on AMP‐activated protein kinase α1 (AMPKα1) activation. Consistent with this finding, metformin could not maintain the barrier function of AMPKα1‐silenced cell monolayers after DSS administration. These findings highlight metformin protects against intestinal barrier dysfunction. The potential mechanism may involve in the inhibition of JNK activation via an AMPKα1‐dependent signalling pathway.
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