Glabridin, a Functional Compound of Liquorice, Attenuates Colonic Inflammation in Mice with Dextran Sulphate Sodium-induced Colitis

Inflammatory bowel disease (IBD) is characterized by detrimental immune reactivity in the gut, and the imbalance between proinflammatory and anti-inflammatory reactivity. The aims of this study were to determine whether oral administration of glabridin, a functional component of liquorice, could ameliorate dextran sulphate sodium (DSS)-induced colitis, as well as to understand the possible underlying mechanisms. Acute experimental colitis was induced in BALB/c mice by treatment with 5% DSS for 7 days. Glabridin (10 or 50 mg/kg/day) was given for 7 days. Treatment with glabridin significantly attenuated mortality, loss of body weight, shortening of the colon and severe clinical symptoms. This was associated with a remarkable amelioration of the disruption of the colonic architecture, a significant reduction in colonic myeloperoxidase (MPO) activity and the production of inflammatory mediators such as nitric oxide (NO), prostaglandin (PG) E2, and proinflammatory cytokines. These results suggest that glabridin-mediated anti-inflammatory action on colorectal sites may be a useful therapeutic approach to IBD.