RESUMO
<p><b>OBJECTIVE</b>To test possible antioxidant activity of n-hexane extract of Podophyllum hexandrum under in vitro and in vivo conditions.</p><p><b>METHODS</b>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).</p><p><b>RESULTS</b>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.</p><p><b>CONCLUSION</b>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.</p>
Assuntos
Animais , Masculino , Ratos , Antioxidantes , Farmacologia , Compostos de Bifenilo , Metabolismo , Tetracloreto de Carbono , Farmacologia , Glutationa Peroxidase , Metabolismo , Glutationa Redutase , Metabolismo , Peroxidação de Lipídeos , Fígado , Metabolismo , Oxirredução , Estresse Oxidativo , Picratos , Metabolismo , Extratos Vegetais , Farmacologia , Podophyllum , Química , Ratos Wistar , Superóxido Dismutase , Metabolismo , Superóxidos , Metabolismo , Substâncias Reativas com Ácido Tiobarbitúrico , MetabolismoRESUMO
Objective: The present study was undertaken to investigate the effect of long dose administration of methanol rhizome extract of Podophyllum hexandrum and hydrogen peroxide on lipid peroxidation of erythrocytes, antioxidant enzyme status of rat liver, kidney, lung and brain tissue and body weight and organ weight changes of albino rats. Methods: The body and organ weight was monitored with digital scale balance and lipid peroxidation of RBC ghost membrane was monitored by measuring malonaldehyde (MDA). Antioxidant enzymes were assayed by standard procedures. Results: Our study showed that administration of H2O2 (0.1%) in drinking water of the rats for 25 weeks increased the malondialdehyde levels in erythrocytes of all the rats. However, rats receiving Podophyllum hexandrum extract and α- tocopherol had lower MDA levels in a dose dependent manner, which indicates decreased lipid peroxidation in these rats. Our results also showed decrease in the activity of glutathione reductase, glutathione-S-transferase and reduced glutathione levels in different organs of H2O2 treated rats. Rats receiving methanolic extract of Podophyllum hexandrum at the concentration of 5, 10 and 15mg% for 25 weeks increased the activity of glutathione reductase, glutathione-S-transferase and glutathione levels in different organs of the rats indicates the protective effect of the plant in combating oxidative stress undergone by the rats. No significant variation (P< 0.05) in the organ weights between the control and the treated groups was observed after 25 weeks of treatment. Conclusions: In conclusion, this study presents strong evidence of the nontoxic effect of the methanol extract of Podophyllumhexandrum. The findings also demonstrate that Podophyllum hexandrum methanol extract increased the levels of antioxidant enzymes and decreased lipid peroxidation in albino rats and explained the extensive utilization of the plant in traditional medicine.