Abstract
Objective: To evaluate the in vivo acute toxicity and antioxidant activity of the marine endophytic fungus extract S2 isolated from Turbinaria conoides. Methods: Two doses (100 mg/kg and 400 mg/kg) of the S2 extract were administered to rats orally for acute toxicity and antioxidant test. The body weight, relative weight of six organs, haematological, biochemical and antioxidant properties were investigated on Day 14. Results: A single oral dose treatment did not cause any mortality or observable adverse effects in rats. No significant variations in the body and organ weights between the control and the treated groups were observed. Heamatological analysis and clinical blood chemistry also did not reveal any toxic effects of the extract. The total white blood cell count and haemoglobin levels were increased. The levels of total serum cholesterol in males treated with 100 and 400 mg/kg were significantly (P<0.05) decreased (1.28 and 1.34 mmol/L respectively) compared to control (1.55 mmol/L) rats. Pathologically, neither gross abnormalities nor histopathological changes were observed. This study showed strong evidence of the non-toxic effects of S2 extract. Furthermore the extract exhibited significant (P<0.05) antioxidant activity through increased levels of superoxide dismutase and glutathione peroxidase enzymes in serum, liver and kidney. Conclusions: The research findings from the present study showed the potential of marine natural products particularly in Malaysia as a source of bioactive compounds. Marine endophytic fungi as a potential source of anticancer drugs with great potential as they are potent yet safe, thus deserving further extensive investigation.
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