Abstract
Objective To investigate the role and mechanism of anterior gradient-2(AGR2)in intestinal mucosal barrier injury induced by tumor necrosis factor-α(TNF-α). Methods Caco-2 cell monolayers were pre-transfected with an AGR2 plasmid and then exposed to TNF-α.Real-time PCR was employed to detect AGR2 mRNA expression, with western blot detection of AGR2 protein expression.Epithelial permeability was assessed by detecting transepithelial electrical resistance.Electron microscope was used to observe autophagic bodies. Results Both AGR2 mRNA and protein expression levels were significantly reduced by TNF-α exposure compared with the levels in untreated control monolayers.AGR2 overexpression signifcantly ameliorated TNF-α induced epithelial barrier hyperpermeability, and mediated mitophagy in Caco-2 cell monolayers. Conclusion This study suggested that AGR2 could inhibit TNF-α induced intestinal barrier dysfunction and this protective mechanism might be promoted by mediated mitophagy in Caco-2 cell monolayers. Key words: Anterior gradient-2; Intestinal mucosal barrier; Tumor necrosis factor-α; Mitophagy; Inflammatory bowel disease
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