JCC: 胱硫醚β-合成酶表达减少会加重溃疡性结肠炎肠屏障损伤

2019-09-02 不详 MedSci原创

内源性H2S可以调节结肠上皮组织中的多种生理和病理过程。目前的研究主要关注了胱硫醚β-合酶[CBS],它是结肠上皮细胞中H2S 的主要生产者,在溃疡性结肠炎[UC]相关肠屏障损伤的发病机制中的作用。本项研究旨在从UC患者收集的炎症和非发炎结肠组织中研究CBS的表达和DNA甲基化水平,以及降低的CBS水平对Caco-2单层屏障损伤和肿瘤坏死因子/干扰素引起的紧密连接状态改变的影响。

背景和目的
内源性H2S可以调节结肠上皮组织中的多种生理和病理过程。目前的研究主要关注了胱硫醚β-合酶[CBS],它是结肠上皮细胞中H2S 的主要生产者,在溃疡性结肠炎[UC]相关肠屏障损伤的发病机制中的作用。本项研究旨在从UC患者收集的炎症和非发炎结肠组织中研究CBS的表达和DNA甲基化水平,以及降低的CBS水平对Caco-2单层屏障损伤和肿瘤坏死因子/干扰素引起的紧密连接状态改变的影响。

方法
研究人员从UC患者中收集非发炎和发炎的结肠上皮组织样品中评估CBS的表达和CBS启动子的甲基化水平。在Caco-2单层中进一步研究了屏障功能,并测试了紧密连接蛋白的状态和NF-κBp65介导的MLCK-P-MLC信号传导途径的激活状态。

结果
与来自UC患者的结肠上皮样品中的非发炎部位相比,在发炎部位观察到CBS的表达降低和CBS启动子的甲基化水平升高。在Caco-2单层中,CBS的表达降低加剧了TNF / IFN诱导的屏障损伤并改变了紧密连接蛋白的位置。通过增强NF-κBp65介导的MLCK-P-MLC信号传导途径可以降低CBS易感Caco-2单层对TNF / IFN引起的损伤的表达。

结论
本项研究表明CBS的表达降低可以通过加剧炎症诱导的肠屏障损伤来增加UC发生。CBS启动子的甲基化升高可能是UC患者结肠上皮组织发炎部位中CBS表达降低的机制之一。

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    2019-09-26 nymo
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    2019-12-01 徐岩
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