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目的:探讨隔药灸对肿瘤坏死因子-α(TNF-α)-核因子κB(NF-κB)-肌球蛋白轻链激酶(MLCK)介导克罗恩病(CD)肠上皮细胞紧密连接的影响.方法:将48只雄性SD大鼠随机分成正常组(NC)、模型组(MC)、隔药灸组(HPM)和美沙拉嗪组(MESA),每组12只.采用2,4,6-三硝基苯磺酸(TNBS)制备CD模型,造模成功后HPM组采用隔药饼灸天枢和气海治疗,MESA组采用美沙拉嗪灌胃治疗.治疗结束后取各组结肠上皮组织分离、纯化和培养以建立体外肠上皮屏障模型,将100 ng/mL TNF-α分别与各组肠上皮细胞孵育培养24 h.应用跨上皮细胞电阻检测各组肠上皮屏障通透性;采用Western blot法检测TNF-α-NF-kB-MLCK介导的肠上皮细胞紧密连接的相关蛋白表达;应用免疫荧光法观察结肠上皮细胞紧密连接蛋白的表达与分布情况.结果:TNF-α诱导后,与MC+TNF-α组肠上皮细胞相比,HPM+TNF-α组及MESA+TNF-α组跨上皮电阻值显著升高(均P<0.001),结肠上皮NF-kBp65、MLCK、肌球蛋白轻链(MLC)、肿瘤坏死因子受体相关因子6(TRAF6)及受体相互作用蛋白-1(RIP1)表达量显著降低(P<0.01或P<0.05),锌指蛋白A20(A20)表达量显著升高(P<0.01),occludin、claudin-1、紧密连接蛋白1(ZO-1)及F-actin表达量亦显著升高(均P<0.01);与MESA+TNF-α组相比,HPM+TNF-α组MLC,occludin,claudin-1,ZO-1及F-actin表达量显著升高(P<0.01或P<0.05).结论:隔药灸可能通过调控TNF-α-NF-kB-MLCK介导的CD肠上皮细胞紧密连接的异常,达到保护或修复CD大鼠肠上皮屏障损伤的效应.“,”Objective: To explore the effect of herb-partitioned moxibustion (HPM) on tight junctions (TJs) of intestinal epithelial cells in Crohn disease (CD) mediated by tumor necrosis factor-α (TNF-α)-nuclear factor kappa B (NF-κB)-myosin-light- chain kinase (MLCK) pathway. Methods: Forty-eight male Sprague-Dawley rats were randomly divided into a normal control (NC) group, a model control (MC) group, an HPM group and a mesalazine (MESA) group, with 12 rats in each group. Trinitrobenzene sulfonic acid (TNBS) was administered to establish CD models. When the model was confirmed a success, the HPM group rats were treated with HPM at Tianshu (ST 25) and Qihai (CV 6), while the MESA group rats were given MESA solution by lavage. When the intervention finished, the colonic epithelial tissues were separated, purified and cultured in each group to establish the intestinal epithelial barrier model in vitro, and TNF-α was added (100 ng/mL) in the culture medium and maintained for 24 h to establish an increased epithelial permeability model. Transepithelial electrical resistance (TEER) was used to examine the permeability of the barrier; Western blot was used to observe the expressions of the proteins related to TJs of intestinal epithelial cells mediated by TNF-α-NF-κB-MLCK pathway; immunofluorescence staining was used to observe the expressions and distributions of tight junction proteins in the intestinal epithelium. Results: After TNF-α induction, compared with the MC+TNF-α group, the TEER value increased significantly in the HPM+TNF-α and MESA+TNF-α groups (both P<0.001); the expressions of nuclear factor kappa B (NF-κB) p65, MLCK, myosin light chain (MLC), tumor necrosis factor receptor-associated factor 6 (TRAF6) and receptor interaction protein-1 (RIP1) decreased significantly (P<0.01 or P<0.05), and the expression of zinc finger protein A20 (A20) increased significantly (P<0.01); the expressions of occludin, claudin-1, zonula occludens protein 1 (ZO-1) and F-actin also increased significantly (all P<0.01). Compared with the MESA+TNF-α group, the expressions of MLC, occludin, claudin-1, ZO-1 and F-actin increased significantly in the HPM+TNF-α group (P<0.01 or P<0.05). Conclusion: HPM can protect or repair the damage of intestinal epithelial barrier in CD rats, which may be achieved through modulating the abnormal TJs in intestinal epithelium mediated by TNF-α-NF-κB-MLCK pathway.