Ko Jae-Sung, Yang Hye-Ran, Chang Ju-Young, Seo Jeong-Kee
Department of Pediatrics, Seoul National University College of Medicine, 28 Yongon-dong, Chongro-gu, Seoul 110-744, Korea.
World J Gastroenterol. 2007 Apr 7;13(13):1962-5. doi: 10.3748/wjg.v13.i13.1962.
To determine whether Lactobacillus plantarum can modify the deleterious effects of tumor necrosis factor-alpha (TNF-alpha) on intestinal epithelial cells.
Caco-2 cells were incubated with TNF-alpha alone or in the presence of L. plantarum. Transepithelial electrical resistance was used to measure epithelial barrier function. Interleukin 8 (IL-8) secretion by intestinal epithelial cells was measured using an ELISA. Cellular lysate proteins were immunoblotted using the anti-extracellular regulated kinase (ERK), anti-phospho-ERK and anti-IkappaB-alpha.
A TNF-alpha-induced decrease in transepithelial electrical resistance was inhibited by L. plantarum. TNF-alpha-induced IL-8 secretion was reduced by L. plantarum. L. plantarum inhibited the activation of ERK and the degradation of IkappaB-alpha in TNF-alpha-treated Caco-2 cells.
Induction of epithelial barrier dysfunction and IL-8 secretion by TNF-alpha is inhibited by L. plantarum. Probiotics may preserve epithelial barrier function and inhibit the inflammatory response by altering the signal transduction pathway.
确定植物乳杆菌是否能改变肿瘤坏死因子-α(TNF-α)对肠上皮细胞的有害作用。
将Caco-2细胞单独与TNF-α孵育或在植物乳杆菌存在的情况下孵育。采用跨上皮电阻来测量上皮屏障功能。使用酶联免疫吸附测定法测量肠上皮细胞分泌的白细胞介素8(IL-8)。细胞裂解液蛋白用抗细胞外调节激酶(ERK)、抗磷酸化ERK和抗IκB-α进行免疫印迹分析。
植物乳杆菌抑制了TNF-α诱导的跨上皮电阻降低。植物乳杆菌减少了TNF-α诱导的IL-8分泌。植物乳杆菌抑制了TNF-α处理的Caco-2细胞中ERK的激活和IκB-α的降解。
植物乳杆菌抑制了TNF-α诱导的上皮屏障功能障碍和IL-8分泌。益生菌可能通过改变信号转导途径来维持上皮屏障功能并抑制炎症反应。