Study of the Protective Effects of Dexamethasone on Ileum Mucosa Injury in Rats With Severe Acute Pancreatitis

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Objectives:To study the protecting effects of dexamethasone on ileum mucosa injury of rats with severe acute pancreatitis (SAP).Methods:The SAP rats were prepared by improved Aho's methods. The plasma endotoxin and inflammatory mediators in serum were determined. The rat mortality, pathological changes of terminal ileum, nuclear factor kappa B (NF-κB), apoptotic indexes, and apoptotic related protein expression were observed.Results:The plasma endotoxin, inflammatory mediators, and NF-κB protein expression as well as pathological scores of the treatment group of ileum mucosa were lower than those of the model group at different time points. P selectin in model group significantly exceeded the dexamethasone treatment group at 3 and 6 hours (P < 0.01, P < 0.05). Caspase-3 protein expression in dexamethasone treatment group significantly exceeded the model group at 3 and 6 hours (P < 0.05), and apoptotic indexes were higher than those of the model group at 6 hours (P < 0.05), but Bax protein has shown no marked difference among groups.Conclusions:Dexamethasone can reduce the endotoxin level and inflammatory mediators and down-regulate NF-κB protein expression of ileum mucosa, and ileum mucosa epithelial cell apoptosis induction was involved as well. The tissue microarrays technique is of advantage in SAP study.

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