Preventive effects of pomegranate seed extract on bleomycin-induced pulmonary fibrosis in rat.

Background: Oxidative stress plays an important role in the pathogenesis of bleomycin-induced lung fibrosis and many antioxidant agents have been used for the treatment of this disease in animals.

Objectives: To evaluate the antioxidant effects of pomegranate seed extract (PSE) on bleomycin treated rats.

Materials And Methods: Male Spraque - Dawley rats were divided into 5 groups: rats in groups I (bleomycin) and II (control) were given a single dose of bleomycin (7.5 IU/kg, intratracheally) in the bleomycin group and same amount of saline in the control, respectively. Treatment groups (III-V) were given PSE (100,200,400 mg/kg) orally a week before the bleomycin injection and this was continued for 3 weeks. At day 28, animals were sacrificed and lungs were removed for histological investigation.

Results: Histological analysis showed that PSE could prevent pathological changes that were seen in the bleomycin group.

Conclusions: Results of the present study showed that hydroalcoholic extracts of pomegranate seeds had a significant protective effect against bleomycin-induced lung fibrosis by its antioxidant properties. The highest protective effect was observed for the 400 mg/kg dose.