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Inflammatory bowel diseases are characterized by disabilities in gastrointestinal system and defects in mucosal immune system. Statins are 3-hydroxy-3-methyl glutaryl coenzyme A reductase inhibitor and are used to treat hypercholesterolemia in patients with coronary artery and atherosclerotic diseases. Recent studies have demonstrated that statins have immunomodulatory role by effecting different pathways in immune system. In this study, we investigated the effect of atorvastatin and its mechanism on systemic immune response in treatment of trinitrobenzene sulfonic acid (TNBS)-induced colitis mice. We observed that atorvastatin significantly suppressed the severity of TNBS-induced colitis in BALB/c mice. This was manifested in reduced rectal bleeding, decrease in colon length, reduction of histological damage, and improved survival. Concurrently, we investigated the immunomodulatory role of atorvastatin …