| Summary: | 博士 === 中山醫學大學 === 醫學研究所 === 97 === Part I
The protective effects of Dunaliella salina (D. salina) on liver damage were evaluated by carbon tetrachloride (CCl4)-induced hepatotoxicity in mice. Male ICR mice were orally treated with D. salina or silymairn daily with administration of CCl4 twice a week for 8 weeks. CCl4 induced liver damage and significantly (p < 0.05) increased the activities of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) in serum and decreased the activities of superoxide dismutase (SOD), catalase, glutathione peroxidase (GSH-Px), and GSH content in liver whereas increased hepatic malondialdehyde (MDA) content as compared with control group. Treatment with D. salina or silymarin could significantly (p < 0.05) decrease the ALT, AST, and ALP levels in serum and increase the activities of SOD, catalase, GSH-Px, glutathione reductase, and GSH content and decrease the MDA content in liver when compared with CCl4-treated group. Liver histopathology also showed that D. salina reduced the incidence of liver lesions induced by CCl4. The results suggest that D. salina exhibits potent hepatoprotective effects on CCl4-induced liver damages in mice, and that the hepatoprotective effects of D. salina may be due to both the increase of antioxidant enzymes activities and inhibition of lipid peroxidation.
Part II
The present study examined the protective effects of seabuckthorn (Hippophae rhamnoides L., SBT) seed oil on carbon tetrachloride (CCl4)-induced hepatic damage in male ICR mice. Our results showed that oral administration of SBT seed oil at doses of 0.26, 1.30, and 2.60 mg/kg for 8 weeks significantly reduced the elevated levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), triglyceride (TG) and cholesterol at least 13% in serum, and the level of malondialdehyde (MDA) in liver at least 22%, that was induced by CCl4 (1 ml/kg) in mice. Moreover, the treatment of SBT seed oil was also found to significantly increase the activities of superoxide dismutase (SOD), catalase, glutathione peroxidase (GSH-Px), glutathione reductase (GSH-Rd) and GSH content in liver up to 134%. Our study found that the optimal dose of SBT seed oil was 0.26 mg/kg, as the minimum amount exhibiting the greatest hepatoprotective effects on CCl4-induced liver injury. Overall, the hepatoprotective effect of SBT seed oil at all tested doses was found to be comparable to that of silymarin (200 mg/kg) and have been supported by the evaluation of the liver histopathology in mice.
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