Regulation of TWIK-related potassium channel-1 (Trek1) restitutes intestinal epithelial barrier function

The disruption of epithelial barrier integrity is an important factor in the pathogenesis of various immune disorders. However, the restitution of the compromised barrier functions is difficult. This study investigates the regulation of TWIK-related potassium channel-1 (Trek1) in the restitution of intestinal epithelial barrier functions. The human colon epithelial cell line T84 was cultured in monolayers and used to observe epithelial barrier functions in vitro. An intestinal allergy mouse model was created. Cytokine levels were determined by enzyme-linked immunosorbent assay and western blotting. The results showed that Trek1 deficiency induced T84 monolayer barrier disruption. Allergic responses markedly suppressed the expression of Trek1 in the intestinal epithelia via activating the mitogen-activated protein kinase pathways and increasing the expression of histone deacetylase-1. The inhibition of histone deacetylase-1 by sodium butyrate or the administration of a butyrate-producing probiotic (Clostridium butyricum) restored the intestinal epithelial barrier functions and markedly enhanced the effect of antigen-specific immunotherapy. The data suggest that Trek1 is required for the maintenance of intestinal epithelial barrier integrity. Allergic responses induce an insufficiency of Trek1 expression in the intestinal epithelia. Trek1 expression facilitates the restoration of intestinal epithelial barrier functions in an allergic environment.     

酪酸梭菌对食物过敏小鼠肠道屏障功能的影响

目的 探讨产丁酸的益生菌酪酸梭菌通过调节肠上皮细胞双孔钾通道Trek1的表达对过敏小鼠肠道屏障功能的影响.方法 建立小鼠食物过敏模型,ELISA法、流式细胞仪检测相关指标验证造模效果,尤斯室检测小肠组织通透性变化,Western blot及免疫荧光法检测Naive组、Saline组、SIT组、SIT/SB组、SB组、SIT/CB组、CB组、SIT/CB/Spadin组小鼠空肠组织中Trek1的表达;Transwell系统中使用T84细胞建立单层上皮细胞层,分别暴露于过敏介质,qRT-PCR和Western blot检测Trek1mRNA和蛋白的表达;分别使用生理盐水、SIT、SIT/SB、SB、SIT/CB、CB、SIT/CB/Spadin不同疗法对过敏小鼠进行治疗,了解小鼠肠道Trek1的表达情况、肠道屏障功能及过敏反应指标的变化情况.结果 相对于对照组,食物过敏小鼠小肠Trek1蛋白表达水平显著下降,肠黏膜通透性显著升高,差异有统计学意义(P＜0.05);T84细胞暴露于过敏介质后,Trek1 mRNA和蛋白的表达显著下降(P＜0.05),但预先加入p38抑制刺可以拮抗这种改变;SIT治疗、酪酸梭菌和丁酸钠单独应用均可以提高食物过敏小鼠肠道Trek1的表达,减轻过敏反应(P＜0.05),但SIT与酪酸梭菌或丁酸钠的联合应用效果更加显著(与SIT组相比P＜0.05),并且可以显著降低小肠黏膜通透性,改善肠道屏障功能(P＜0.05).结论 丁酸钠或者产丁酸的益生菌酪酸梭菌可以通过提高Trek1的表达来恢复过敏小鼠的肠道屏障功能,减轻过敏反应,并且加强SIT治疗的效果.