Collagen peptides ameliorate intestinal epithelial barrier dysfunction in immunostimulatory Caco-2 cell monolayers via enhancing tight junctions.

Dysfunction of the intestinal barrier plays a key role in the pathogenesis of inflammatory bowel disease (IBD) and multiple organ failure. The effect of Alaska pollock skin-derived collagen and its 3 tryptic hydrolytic fractions, HCP (6 kDa retentate), MCP (3 kDa retentate) and LCP (3 kDa permeate) on TNF-a induced barrier dysfunction was investigated in Caco-2 cell monolayers. TNF-a induced barrier dysfunction was significantly attenuated by the collagen and its peptide fractions, especially LCP, compared to TNF-alpha treated controls (P < 0.05). Compared to a negative control, 24 h pre-incubation with 2 mg mL(-1) LCP significantly alleviated the TNF-alpha induced breakdown of the tight junction protein ZO-1 and occludin and inhibited MLC phosphorylation and MLCK expression. The activation of NF kappa B and Elk-1 was suppressed by LCP. Thus, collagen peptides may attenuate TNF-alpha induced barrier dysfunction of Caco-2 cells by inhibiting the NF kappa B and ERK1/ 2-mediated MLCK pathway with associated decreases in ZO-1 and occludin protein expression.