Hepatoprotective and antioxidant activity of rhizome of Podophyllum hexandrum against carbon tetra chloride induced hepatotoxicity in rats.

OBJECTIVE: To test possible antioxidant activity of n-hexane extract of Podophyllum hexandrum under in vitro and in vivo conditions.
METHODS: The in vitro antioxidant activity was evaluated by the ability of the extract to interact with the stable free radical DPPH, Superoxide (O2-), Hydroxyl (OH-), Hydrogen peroxide (H2O2) radicals, and reducing power ability of the extract was also evaluated. Under in vivo conditions the extract was evaluated for its hepatoprotective activity by measuring different biochemical parameters, such as serum alanine aminotransaminase, serum aspartate aminotransaminase and serum lactate dehydrogenase and antioxidant enzymes. Antioxidant status was estimated by determining the activities of antioxidative enzymes, glutathione reductase (GR), glutathione peroxidase (GPx), glutathione-S-transferase (GST) and superoxide dismutase (SOD), and by determining the levels of reduced glutathione (GSH) and thiobarbituric acid reactive substances (TBARS).
RESULTS: Hexane extract of P. hexandrum exhibited good radical scavenging capacity in neutralization of DPPH, O2-, OH-, and H2O2 radicals in a dose dependent manner. n-hexane extract of Podophyllum hexandrum at the doses of 20, 30, and 50 mg/kg-day produced hepatoprotective effect by decreasing the activity of serum marker enzymes, while it significantly increased the levels of glutathione (GSH), glutathione peroxidase (GPx), glutathione reductase (GR), super oxide dismutase (SOD), and glutathione-S-transferase (GST) in a dose dependant manner. The effect of n-hexane extract was comparable to that of standard antioxidant vitamin E.
CONCLUSION: The extract of Podophyllum hexandrum possess free radical scavenging activity under in vitro conditions and could protect the liver tissue against CCl(4) induced oxidative stress probably by increasing antioxidant defense activities.