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 Vitamin A on the Status of Antioxidants in Ethanol-Treated Rats

비타민 A 섭취가 에탄올을 급여한 흰쥐의 체내 항산화 영양소 상태에 미치는 영향

  • 서정숙 (영남대학교 식품영양학과) ;
  • 양경미 (영남대학교 식품영양학과) ;
  • 최미정 (영남대학교 식품영양학과)
  • Published : 1995.12.01
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Abstract

The present study was conducted to investigate the effect of dietary vitamin A on the antioxidant status in ethanol-treated rats. Weaning rats were fed a basal diet until they reached about 160-180g body weight. Thereafter, four experimental groups were fed a liquid diet containing 36% ethanol of total calorie and four pair-fed groups were fed isocaloric sucorse instead of ethanol. Additionally, the liquid diet contained adequate amount of ${\beta}-carotene$, retinyl acetate, or 13-cis-retinoic acid except vitamin A deficient diet. The rats were sacrificed after 7 weeks of feedng periods. Significant decrease in hepatic vitamin E content was found in rats treated with chronic ethanol. However, dietary supplementation of retinyl acetate modified the change to some extent. Total vitamin C content of liver increased in vitamin A-deficient or ${\beta}-carotene$ groups with ethanol feeding. The ratio of reduced/oxidized vitamin C increased in the plasma and liver of ${\beta}-carotene$ group with ethanol feeding. Chronic ethanol intake did not change the total glutathione content of rat liver, but increased reduced glutathione(GSH)/oxidized glutathione(GSSG) ratio. This increase in hepatic GSH after chronic ethanol treatment. The changes of Se content in plasma and liver was not consistant. Fe content of liver increased by ethanol treatment, but this increase reduced in rats fed dietary retinyl acetate or 13-cis-retinoic acid. Fe content of plasma increased in vitamin A-deficient and ${\beta}-carotene$ supplemented groups with ethanol intake.

본 연구는 만성적인 에탄올 급여에 의한 조직내 항산화 영양소 함량의 변화에 대하여 비타민 A의 형태별 급여효과를 조사하고자 실시되었다. 실험동물은 Sprague-Dawley종 숫컷 흰쥐를 사용하였으며 에탄올 공급과 동시에 비타민 A 결핍군(FE), ${\beta}-carotene$ 섭취군(${\beta}E$), retinyl acetate 섭취군(RE) 그리고 13-cis-retinoic acid 성취군(RAE)과 에탄올 대신 동일 열량을 sucrose으로 공급 시킨 각각의 pair-fed군 등 모두 8군으로 나누어 7주 동안실섬 식이를 공급하였다. 항산화 영양소로 비타민 E, C, glutathione 그리고 무기질 함량의 분석을 통해서 에탄올에 의해 변화되는 생체내 항산화 영양소 상태와 이에 비타민 A의 형태별 급여 효과를 조사하여 다음과 같은 결과를 얻었다. 혈장내 ${\alpha}-tocopherol$ 함량은 에탄올­ 급여로 감소되었으나 간 조직내에서는 ${\beta}-carotene$ 섭취군만이 낮은 함량을 보였다. 그러나 간 조직내 tocopheryl acetate 함량은 pair-fed군에 비해서 에탄올 급여로 현저히 저하되었다. 혈장과 간 조직내에서 에탄올 급여에 의한 비타민 E 함량 감소는 retinyl acetate 공급으로 그 감소 정도가 가장 저하되었다. 혈장내 총 비타민 C 함량은 에탄올 급여와 동시에 ${\beta}-carotene$이나 retinyl acetate 섭 취군이 pair-fed군에 비해서 낮았으며 환원형과 산화형 비타민 C 함량비는 에탄올 급여로 낮았으나 ${\beta}-carotene$ 섭취시킨 군만이 높게 나타났다. 간 조직내 총 비타민 C 함량은 13-cis-retinoic acid 섭취군을 제외한 전 군에서 에탄올 급여로 증가하였으여 환원형과 산화형 비타민 C 비는 에탄올 급여군 중 ${\beta}-carotene$을 섭취시켰을 때 가장 높았다. 간 조직내 총 glutathion 함량은 에탄올 공급군과 pair-fed군 사이에 유의적인 차이를 보이지 않았으나 환원형과 산화형의 함량비에서는 에탄올과동시에 retinyl acetate나 13-cis-retinoic acid 섭취군에서 pair-fed군에 비해 높았다. 혈장내 Zn, Cu, Se, Fe 함량은 에탄올 급여군과 pair-fed군 사이에 일정한 경향을 보이지 않았으나 간 조직내 Zn, Cu 함량은 에탄올 급여로 감소된 반면 Fe 함량은 증가되었다. 이러한 결과들로 보아 에탄올은 체내 항산화 영양소 상태의 변화를 초래하며 비타민 A의 공급여부 뿐만 아니라 형태별 섭취에 의해서 항산화 영양소 상태가 변화될 수 있는 것으로 나타났다. 그러나 생체내 항산화 영양소들은 서로 상쇄, 상승 혹은 길항작용을 통해서 상호영향을 미치므로 각각의 항산화 영양소 상태 변화에 대한 정확한 기전 규명을 위해서는 다각적인 연구가 요구된다고 볼 수 있다. 그러나 지질과산화물의 함량과 체내 항산화 영양소 상태는 상호관련성이 있었으며 본 실험에서 에탄올 공급에 의한 항산화 영양소 함량의 감소는 대체로 비타민 A를 retinyl acetate 형태로 섭취시켰을 때 다소 경감되는 것으로 나타났다.

Keywords

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