| Summary: | The study evaluated the antioxidant properties of a crude methanolic extract (CME) from Rhaebo guttatus poison in mice over a period of 7 and 30 days. The mice were divided into groups and treated with different concentrations of the extract (0; 8 μg mL-1; 16 μg mL-1 and 32 μg mL-1 or vehicle; 100 μL/animal/day; via gavage). The liver samples were analyzed for status redox parameters as catalase (CAT), glutathione-S-transferase (GST), reduced glutathione (GSH) and thiobarbituric acid reactive substances (TBARS). The results showed that the CME caused changes in the levels of various antioxidants and oxidative stress markers. At 7 days, there was an increase in TBARS levels (8 μg mL-1 dose) and GST activity (16 μg mL-1 dose), and a reduction in GSH levels (32 μg mL-1 dose) compared to the control group. At 30 days, TBARS and GSH levels returned to control values in the same period, but GSH increased (32 μg mL-1 dose) compared at 7 days; GST activity remained high after 30 days for 32 μg mL-1 dose compared other groups and time of treatment (7 days). Overall, the study suggests that the extract modulates antioxidant properties per se that can affect various markers of status redox in the liver of mice, mainly 16 μg mL-1 dose demonstrated to act under antioxidant enzymes in different times (7 or 30 days).
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