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-  2018 

小檗碱改善肠黏膜屏障损伤及其可能机制的实验研究 Experimental Study of Berberine Improving Intestinal Mucosal Barrier Damage and Its Possible Mechanisms

Keywords: 小檗碱,caco-2细胞,脂多糖,肠黏膜屏障,紧密连接蛋白

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Abstract:

目的:研究小檗碱(BBR)改善肠黏膜屏障损伤及可能机制。方法:人结肠腺癌细胞系(caco-2)培养形成完整的紧密连接单层。不同浓度的脂多糖(LPS)(0,0.1,1,10μg/ml)作用于caco-2细胞24h后,检测单层跨膜电阻与通透性以及凋亡相关蛋白caspase12表达。实验分为对照组、模型组(LPS 10μg/ml),干预组(LPS 10μg/ml与BBR 10μmol/L),作用24h后检测通透性与紧密连接蛋白zo-1,occludin,claudin-1的表达以及各组TLR4,MyD88,NF-κB的变化。结果:caco-2细胞单层通透性在LPS(0-10μg/ml)范围内呈浓度依赖性增加;10μg/ml以下浓度的LPS作用后caspase12表达与对照组无明显差异;与对照组比较,模型组的紧密连接蛋白表达明显降低,蛋白TLR4,MyD88,NF-κB的表达明显增加(P<0.05);而与模型组比较,干预组紧密连接蛋白则明显增加,蛋白TLR4,MyD88,NF-κB的表达明显降低(P<0.05)。结论:小檗碱能增加肠上皮细胞间紧密连接(TJ)蛋白的表达,从而有效修复LPS引起的肠黏膜屏障损伤,LPS诱导caco-2细胞紧密连接蛋白减少可能是通过TLR4,MyD88,NF-κB信号通路的活化,而BBR能抑制该信号通路从而能改善紧密连接蛋白的表达

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