Beneficial Effects of THSG on Acetic Acid-Induced Experimental Colitis: Involvement of Upregulation of PPAR-γ and Inhibition of the Nf-Kb Inflammatory Pathway

The polyphenolic compound 2,3,5,4'-tetrahydroxystilbene-2-O-beta-D-glucoside (THSG) has been shown to possess anti-inflammatory effects. Here, we examined the effects of THSG on experimental mice with colitis induced by acetic acid and whether the underlying mechanisms were associated with the PPAR-gamma and NF-kappa B pathways. Mice were randomized into six equal groups: normal, colitis model, THSG (10, 30, 60 mg.kg(-1)) and mesalazine. The mice were administered 10, 30, 60 mg.kg(-1) THSG or 100 mg.kg(-1) mesalazine or saline once daily by intragastric administration for 7 days after induction of colitis by acetic acid irrigation. THSG dramatically attenuated acetic acid-induced colon lesions, including reversing the body weight loss and improving histopathological changes. THSG apparently decreased the increase of malondialdehyde (MDA) which is a marker of lipid peroxidation. THSG appears to exert its beneficial effects on acetic acid-induced experimental colitis through upregulation of PPAR-gamma mRNA and protein levels and inhibition of the NF-kappa B pathway, which in turn decreases the protein overexpression of the downstream inflammatory mediators TNF-alpha, IL-6 and COX-2. The effect of THSG 60 mg.kg(-1) on PPAR-gamma mRNA expression was higher than that of mesalazine. THSG may thus be a promising new candidate or lead compound for the treatment of IBD.