ABSTRACT
To investigate the protective effect of selenium-enriched Bifidobacterium longum preparation on rat IEC6 cells via the application of lipopolysaccharide (LPS)-induced IEC6 cell injury model. Methods The experiment was divided into five groups; negative control group treated with phosphoric acid equilibrium salt solution, model group treated with LPS, and low, medium, high concentration group in which IEC6 cells were treated with LPS plus 10, 30, 100 mg • L"1 water-soluble proteins from selenium-enriched Bifidobacterium longum respectively. After treatment with LPS for 24 hours, IEC6 cell viability, apoptosis, mitochondria membrane potential, and the expression of zonula occludens 1 (ZO-1) and Occludin were detected. Results LPS induced rat intestinal epithelial cell damage, such as the decrease of cell viability, the increase of cell apoptosis, the collapse of mitochondria membrane potential, and the decrease of cell tight junction protein expression. Water-soluble proteins from selenium-enriched Bifidobacterium longum inhibited LPS-induced IEC6 cell damage, decreased cell apoptosis and increased cell tight junction between cells. Conclusion Water-soluble proteins from selenium-enriched Bifidobacterium longum have protective effect on LPS-induced rat intestinal epithelial cell injury.