Anti-oxidant activities of kiwi fruit extract on carbon tetrachloride-induced liver injury in mice / 대한수의학회지

The kiwi (Actinidia deliciosa) is well known to contain anti-oxidants. In this study, we investigated the anti-oxidant effects of kiwi extract on carbon tetrachloride (CCl4) induced liver injury in BALB/c mice. The radical scavenging effect of 80% methanol extract of Halla-Gold kiwi was observed. For the animal study, mice were randomly divided into four groups: normal group, CCl4-induced model group, kiwi extract administered group, and silymarin treated group. The kiwi extract was provided daily for 10 days. At the 24 h after last administration, CCl4 was injected. The kiwi extract showed strong inhibitory effect of DPPH radicals and superoxide scavenging. In animal study, administration of CCl4 resulted in significantly elevated plasma levels of ALT and AST but they decreased in kiwi-extract pretreated group. Anti-oxidant enzymes such as GSH-px and GSH-rd were restored in the kiwi extract treatment group. Histopathological degeneration was also prevented in the kiwi extract treated group compared with of the control group, which exhibited CCl4-induced hepatotoxicity. On the basis of the obtained results, it can be concluded that kiwi extract showed protective effects, not only as anti-oxidant effects, but also in the protection of hepatotoxicity in CCl4-intoxicated mice.

Dangyuja (Citrus grandis Osbeck) Peel Improves Lipid Profiles and Alleviates Hypertension in Rats Fed a High-Fat Diet / 한국실험동물학회지

Obesity is a major public health problem and significant risk factor for many serious diseases including coronary artery disease, cancer, and diabetes. This study was performed to investigate the hypolipidemic effects and anti-hypertensive effect of Dangyuja (Citrus grandis Osbeck) peel, which is bred on Jeju island, in rats fed a high-fat diet. This study was conducted on 4 equal rat groups which were fed as follows; normal diet group (ND), high fat diet group (HFD), high fat diet supplemented with powdered peel of Dangyuja (1%, wt/wt) group (HFD+Dangyuja), and high fat diet treated with sibutramine simultaneously at a dose of 10 mg/kg group (HFD+Sibutramine). After feeding the high fat diet, body weight gain and relative weight of adipose tissues and liver significantly increased in HFD group, but Dangyuja peel supplementation protected these HFD-induced changes. The levels of serum triglyceride, total cholesterol, low-density lipoprotein (LDL)-cholesterol, and the atherogenic index significantly decreased in the HFD+Dangyuja peel group compared with the HFD group. The systolic blood pressure was significantly increased by feeding the high fat diet, whereas the supplementation of Dangyuja peel effectively prevented the elevation of blood pressure. Therefore, these results suggest that Dangyuja exerts a beneficial effect on obesity by improving lipid metabolism and alleviating obesity-related hypertension.