Background And Study Aims: Necrotizing enterocolitis (NEC) is a severe gastrointestinal disease in neonates. In vitro model is an indispensable tool to study the pathogenesis of NEC. This study explored the effects of different stress factors on intestinal injury in vitro.
Material And Methods: Rat intestinal epithelial cell line-6 (IEC-6) cells were exposed to different stressors, including lipopolysaccharide (LPS), cobalt chloride (CoCl), and a combination of both. We estimated the cell viability, the expression of inflammatory cytokines and tight junction proteins.
Results: The decrease in IEC-6 cell viability was observed after stimulation by CoCl alone or in combination with LPS, but not after stimulation with LPS alone. The expression of interleukin6 (IL-6) and tumornecrosisfactoralpha (TNFα) increased in each group. After stimulation with CoCl alone or in combination with LPS, a decrease in Claudin-1 was observed, but an increase was detected after stimulation with LPS alone. Zona occludens 1 (ZO-1) decreased in both mRNA and protein levels after combined stimulation.
Conclusion: The combined stimulation of LPS and CoCl on IEC-6 cells could simultaneously induce severe inflammation and barrier damage, which may better simulate the pathological process of NEC.
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