오가피 추출물이 고지방 식이를 급여한 흰쥐의 체내 지질대사, 심혈관계질환지수 항산화능 및 항산화 효소계에 어떤 영향을 미치는지 알아보고자 하였다. 연구 결과를 요약하면 아래와 같다. 1. 식이 섭취량은 고지방 식이군이 정상 식이군에 비해 유의적 (p<0.05)으로 감소하였으며, 식이 효율은 유의적 (p<0.05)으로 높았다. 최종 체중과 체중 증가량은 고지방 식이군과 정상 식이군 간에 유의적인 차이가 없었다. 2. 혈장의 HDL-콜레스테롤은 고지방 식이군에서 오가피 추출물의 첨가로 증가하였으며 LDL-콜레스테롤은 감소하였다(p<0.05). 중성지방은 고지방 식이군이 정상 식이군에 비해 증가하였으며, 오가피 추출물 섭취로 감소하였다(p<0.05). 간의 총 지질은 군 간에 차이가 없었고, 총콜레스테롤은 정상 식이군에 비해 고지방 식이군에서 유의하게 증가하였으나(p<0.05) 오가피 추출물의 첨가로 유의하게 감소하였으며(p<0.05), 중성지방 농도는 정상 식이군에 비하여 고지방 식이군에서 유의적으로 증가하였다(p<0.05). 3. 심혈관위험지수와 동맥경화지수는 고지방 식이군에 비하여 고지방 식이 오가피 추출물군에서 유의적으로 감소하였다(p<0.05). 4. 혈장과 간의 지질 과산화물 농도는 정상 식이군에서 오가피 추출물 섭취로 유의하게 감소하였다(p<0.05). 혈장의 TAS 값은 고지방 섭취로 감소되었으나, 오가피 추출물 섭취로 유의하게(p<0.05) 증가되었다. 5. 간의 SOD, catalase 및 GST 활성도는 정상 식이군과 고지방 식이군에서 오가피 추출물 첨가군이 오가피 추출물 무첨가군에 비해 유의적으로 증가하였고(p<0.05), glutathione peroxidase 활성도와 glutathione 함량은 고지방 식이군에서 오가피 추출물 첨가로 유의하게(p<0.05) 증가하였다. 이상의 결과에서 고지방 식이를 공급하였을 때 오가피 추출물 섭취는 혈장의 HDL-콜레스테롤 농도는 높이고, 혈장과 간의 총콜레스테롤과 중성지방의 농도는 낮추어 심혈관 위험지수와 동맥경화지수를 효과적으로 감소시키므로 지질 개선 및 고지혈증에 대한 개선 효과가 있을 것으로 보인다. 또한 항산화 효소 활성을 증가시켜 혈장과 간의 지질 과산화물 생성을 억제시키므로 항산화제로서 작용할 수 있음을 시사해 주고 있다. 그러나 지질 개선 및 천연 항산화제로서 작용할 수 있는 오가피의 용량에 대해서는 좀 더 많은 연구가 필요한 것으로 사료된다.
The effects of an Acanthopanacis cortex water extract on lipid levels, lipid peroxide, total antioxidant status and antioxidant enzyme activities were evaluated in rats fed one of the following diets for six weeks: normal diet and deionized water (ND), normal diet and Acanthopanacis cortex water extract (NDC), high fat diet and deionized water (HFD), high fat diet and Acanthopanacis cortex water extract (HFDC). The food intakes were significantly lower, but the food efficiency ratios were significantly higher in the high fat diet groups. The level of HDL-cholesterol in the plasma was significantly increased and the levels of LDL-cholesterol and triglyceride in the plasma were significantly decreased by the Acanthopanacis cortex water extract in the high fat diet groups. As a a result, the AI (atherogenic index) and CRF (cardiac risk factor) were significantly lower in the high fat diet groups that were treated with Acanthopanacis cortex water extract. The triglyceride and the total cholesterol of the liver were also significantly upregulated in the high fat diet groups, while the total cholesterol of the liver decreased in response to treatment with Acanthopanacis cortex water extract (HFDC). The plasma and liver concentrations of thiobarbituric acid reactive substances (TBARS) were significantly reduced by the addition of Acanthopanacis cortex water extract to the normal diet groups. The total antioxidant status (TAS) in the plasma was significantly upregulated by adding Acanthopanacis cortex water extract to the high fat diet groups. The activities of SOD, catalase and GST were also significantly higher in the Acanthopanacis cortex water extract groups when compared to the ionized water groups. The activity of GSH-Px and the concentration of GSH in the liver were significantly higher following the addition of Acanthopanacis cortex water extract to the high fat diet groups. Taken together, these results suggest that a supplementation of the diet of rats fed a high fat diet with Acanthopanacis cortex water extract improves lipid metabolism, reduces lipid peroxide and improves the activities of antioxidant enzymes, which may have favorable effects on antioxidant systems by improving the total antioxidant status (TAS).
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