Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Dietary Supplementation of Vitamin A and Chronic Consumption of Ethanol on Oxidative Damage and Antioxidant System in Rats

비타민 A 보충 식이 및 에탄올의 만성적 급여가 흰쥐의 체내 산화적 손상과 항산화체계에 미치는 영향

  • 양경미 (경산대학교 생명자원공학부)
  • Published : 2003.03.01
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Abstract

Alcohol is well known agent which can damage the human tissues such as liver via stimulating lipid peroxidation. On the other hand, carotenoids in addition to vitamins A, C and I play important roles in protecting these oxidative damages as well as preventing the production of free radicals. This study was carried out to investigate the effect of dietary vitamin A on lipid peroxidation and antioxidants status in ethanol-treated rats. In the experiment, male Sprague-Dawley rats weighing 160~180 g were given a liquid diet containing 36% of total calories as ethanol for 7 weeks. The pair-fed control rats received an isocaloric amount of diet containing sucrose instead of ethanol on the following day Additionally, the liquid diet contained adequate amount of $\beta$-carotene, retinyl acetate or 13-sis-reinoic acid except vitamin A-deficient diet. The results obtained are as follows. The levels of plasma and hepatic lipid peroxide were increased after chronic ethanol feeding in rats. Retinyl acetate supplementation significantly reduced lipid peroxidation induced by ethanol feeding Glucose 6-phosphatase activity was significantly reduced in rats fed vitamin A-deficient diet with ethanol and alkaline phosphatase activity was significantly induced in rats fed 13-cis-reinoic acid diet with ethanol. Catalase and alcohol dehydrogenase activities did not show a consistent tendency in experiment groups. The hepatic antioxidant enzyme activities did not significantly changed by chronic ethanol feeding groups. The striking decrease in conversion of $\beta$-carotene to retinol was observed in rats fed a $\beta$-carotene diet with ethanol feeding The level of retinol and retinoic acid in plasma and liver was decreased after chronic ethanol administration Based on this result, these data suggest that ethanol feeding enhances oxidative stress especially in those fed a vitamin A-deficient diet, and vitamin A supplementation, especially, retinyl acetate intake can prevent enhanced lipid peroxidation and related damage to some extent.

본 연구는 에탄올을 급여하는 동안 일어나는 지질과산화에 의한 간 손상과 이에 대하여 $\beta$-carotene, retinyl acetate, 13-cis-retinoic acid의 효과를 비교ㆍ검토하고자 실시되었다. 혈 장내 MDA 함량은 에탄올 급여군 중 비타민 A를 결핍시킨 FE군과 $\beta$-carotene을 공급한 DE군에서는 감소되지 않았으나, retinyl acetate와 13-cis-retinoic acid 공급시킨 RE군과 RAE군에서 감소되었다. 간 미토콘드리아내 MDA함량은 에탄을 급여군 중 FE군과 $\beta$E군에서 높은 함량을 보인데 반해 RE군과 RAE군에서는 낮은 수준을 보였다. 에탄올 비급여군인 pair-fed군중에서는 비타민 A를 결핍시킨 FP 군에 비해 $\beta$-carotene과 retinyl acetate를 각각 공급한 5P와 RP군의 MDA 함량은 감소하였는데 반해 retinoic acid를 공급한 RAP군의 MPA 수준은 차이를 보이지 않았다. 혈장내 AP 활성도는 에탄올과 함께 $\beta$-carotene과 retinoic acid를 공급시킨 군에서 각각의 pair-fed군에 비하여 높은 활성도를 보였으며 간 마이크로솜내 G6P 활성도는 에탄올 급여군 중 비타민 A 결핍군만 pair-fed군에 비해 유의적으로 감소되었으며 비타민 A를 보충시켰을 때에는 활성도가 증가되었다. 간 사이토졸내 SOD 활성도는 에탄을 급여와 함께 비타민 A를 결핍시킨 군에 비해 13-ciz-retinoic acid을 공급시킨 군이 가장 높았으며 Pair-fed 군 중에서는 retiny acetate 공급군에서 가장 낮은 높은 활성도를 보였다. 간 사이토졸내 GSH-Px 활성도는 에탄올 급여군과 pair-fed 군 사이에 일정한 경향은 없었으며 간 사이토졸네 GST 활성도는 에탄올 급여군 중 $\beta$-carotene과 retinyl acetate 공급군이 각각의 pair-fed군에 비해 증가되었다. 간조직내 $\beta$-carotene함량은 $\beta$-carotene, 공급군에서만 검출되었고 에탄을 급여군이 pair-fed군에 비해 6배정도 높은 함량을 보였으며 혈장과 간조직 내 retinol 함량은 에탄올 급여로 낮은 함량을 보였으나 비타민 A형태 중 retinyl acetate 공급군이 가장 높았다. 간조직 내 retinoic acid 함량은 에탄을 급여군 중 $\beta$-carotene과 retinyl acetate 공급군이 각각의 Pair-fed 군에 비해 유의적인 감소를 보였다. 상기 연구 결과를 보면 에탄올 급여로 지질과 산화물 함량이 증가되고 관련 항산화 효소계의 활성도 변화로 보아 간 손상에 지질과산화 반응이 관여된 것으로 보여 지며 에탄올의 영향에 대한 비타민 A의 효과에는 retiny1 acetate가 항산화제로 작용하여 간조직의 급격한 손상을 효율적으로 경감시킬 수 있는 것으로 나타났다.

Keywords

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