Effect of hydroalcoholic extract of Hibiscus rosa sinensis Linn.leaves in experimental colitis in rats
摘要
Objective:To elucidate the ameliorative effect of liydrualcuholic extract of leaves of Hibiscus rosa sinensis(HRS) in acetic acid induced experimental colitis in male wistar rats.Methods: The animals were administered with 2 mL acetic acid(4%) via intra rectal.The animals were divided into various treatment groups(n=6).Prednisolone was used as standard drug and HRS was administered at a dose of 50,100 and 200 mg/kg p.o.The control group of animals received 1 mL of vehicle(distilled water).Ulcer area,ulcer index,spleen weight,colon weight to length ratio, macroscopic score,haemalological parameters,colonic superoxide dismutase(SOD),glutathione(GSH),myeloperoxidase(MPO),malondialdchyde(MDA),tumor necrosis factor-α(TNK- α), nitric oxide(NO) and histological changes were recorded after the treatment regimen of 11 days. Results:Intrarectal instillation of acetic acid caused enhanced ulcer area,ulcer index,spleen weight,colon weight to length ratio,colonic MPO,MDA,NO and TNF-α It caused significant decreased level of SOD and GSH.Pretreatment with HRS for 7 days exhibited significant effect in lowering of oxidative stress,colonic NO,TNF- α and elevation of SOD and GSH at a dose of 100 and 200 mg/kg in acetic acid induced colilis.Conclusions:The present investigation demonstrates HRS is of potent therapeutic value in the amelioration of expcrimenlal colilis in laboralory animals by inhibiting the proinflammatory mediator like NO and TNK-α.