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Purpose   Sepsis originates from the host inflammatory response, especially to bacterial infections, and is considered one of the main causes of death in intensive care units. Various agents have been developed to inhibit mediators of the inflammatory response; one prospective agent is  β -sitosterol ( β S), a phytosterol with a structure similar to cholesterol. This study is aimed at evaluating the effects of  β S on the biomarkers of inflammation and liver function in cecal ligation and puncture- (CLP-) induced septic rats.Methods   Thirty male Wistar rats were divided equally into six groups as follows: sham, CLP, CLP+dexamethasone (DX, 0.2 mg/kg), CLP+ β S (1 mg/kg), CLP+imipenem (IMI, 20 mg/kg), and CLP+IMI (20 mg/kg)+ β S (1 mg/kg). Serum levels of IL-1 β , IL-6, IL-10, AST, ALT, and liver glutathione (GSH) were assessed by ELISA. Liver expression levels of TNF- α  and NF- κ Bi mRNAs were evaluated by RT-qPCR.Results   Serum concentrations of IL-1 β , IL-6, IL-10, ALT, and AST and mRNA levels of TNF- α  and NF- κ Bi were all significantly higher in septic rats than in normal rats ( p  < 0.05). Liver GSH content was markedly lower in the CLP group than that in the sham group.  β S-treated rats had remarkably lower levels of IL-1 β , IL-6, IL-10, TNF- α , NF- κ Bi, AST, and ALT (51.79%, 62.63%, 41.46%, 54.35%, 94.37%, 95.30%, 34.87%, and 46.53% lower, respectively) and greater liver GSH content (35.71% greater) compared to the CLP group ( p  < 0.05).Conclusion    β S may play a protective role in the septic process by mitigating inflammation. This effect is at least partly mediated by inhibition of the NF- κ B signaling pathway. Thus,  β S can be considered as a supplementary treatment in septic patients.

β-Sitosterol Alters the Inflammatory Response in CLP Rat Model of Sepsis by Modulation of NFκB Signaling