Effect of Chronic Alcohol Feeding and 2-Acetylaminofluorene Treatment on Hepatic Mitochondrial ATPase Activity and Membrane Lipid Composition in Rats

만성 알코올 섭취시 2-Acetylaminofluorene 투여가 흰쥐 간 미토콘드리아 ATPase 활성도와 막지질 조성에 미치는 영향

  • 김정희 (서울여자대학교 영양학과) ;
  • 류선영 (서울여자대학교 영양학과)
  • Published : 1995.12.01

Abstract

This study was done ot investigate the effect of chronic alcohol feeding and acetylaminofluorene(2-AAF) treatment on hepatic mitochondrial ATPase activity andmembrane lipid composition. Male Sprague-Dawley rats, weighing 120~125g, were fed for 6 weeks on a liquid diet containing 35% of calories as ethanol. After 4 weeks of experiment diet feeding, 2-AAF(100mg/kg body weight) was injected twice a week intraperitoneally. Body weight and percent liver weight per body weight were significantly changed by ethanol feeding. Hepatic mitochondrial ATPase activity significantly decreased by ethanol feedings but not by 2-AAF treatment. In comparison to control, the ATPase activity of ethanol-AAF group decreased 29.3%. Since phospholipid(PL) content of mitochondria has an interaction effect between ethanol and 2-AAF treatment, 2-AAF treatment significantly increased phospholipid content in only ethanol fed group. Total cholesterol(C) level of mitochondria significantly increased by ethanol feeding. Consequently C/PL ratio of ethanol group was significantly higher than that of control group. The analysis of mitochondrial PL composition showed that cardiolipin(CL) significantly increased by 2-AFF treatment in control group. Phosphatidyl choline(PC) significantly increased by ethanol feeding, whereas PC significanlty decreased and phosphatidyl ethanolamine(PE) significantly increased by 2-AAF treatment. 2-AAF treatment also showed a significant increase in PE/PC ratio. Fatty acid patterns of mitochondria were also changed by either ethanol or 2-AAF although the severity of the changes was not great. These data suggest that the reduced mitochondrial ATPase activity in ethanol-AAF group may be a consequence of a changes in mitochondrial membrane lipid composition such as PE/PC ratio, C/PL ration and fatty acid patterns.

만성적인 알코올 섭취가 미토콘드리아의 지질조성 및 ATPase 활성도에 미치는 영향을 조사하고 아울러 간의 발암물질인 2-AAF를 토여하여 간 미토콘드리아의 기능에 미치는 상호 효과를 조사하기 위하여 120~125g 숫쥐에게 열량의 35%를 알코올로 공급하여 6주간 사육하였으며 알코올 섭취 4주 후에 2-AAF를 3일 간격으로 2회 복강투여하여 실험한 결과를 요약하면 다음과 같다. 1. 체중 증가, 식이 섭취량 및 식이효율에 대한 알코올의 효과는 유의적인 차이를 보였으나, 2-AAF에 의한 유의적인 효과는 관찰할 수 없었다. 알코올 섭취군이 대조군 보다 체중은 유의적으로 감소하였다. 2. 미토콘드리아 ATPase 활성도는 알코올 섭취에 의해 유의적으로 감소되었고, 2-AAF 투여에 의해서는 유의적이지 않으나 감소되는 경향을 보였다. 따라서 대조군(C)에 비하여 알코올 섭취와 2-AAF투여군(EA)에서 ATPase 활성도가 29.3%의 감소를 나타냈다. 3. 간 미토콘드리아 콜레스테롤 함량은 알코올 섭취에 의해 유의적으로 증가하였으며 미토콘드리아 총 인지질량은 알코올과 2-AAF에 의한 상호작용에 의해 알코올 투여군에서만 2-AAF 투여시 유의적인 증가 효과를 보여주었다. C/PL 비율은 알코올 섭취와 2-AAF 투여 보두에서 유의적인 효과는 보이지 않았으나 군간 비교시 알코올군(E)이 대조군(C) 보다 유의적으로 증가하였다. 4. 간 미토콘드리아의 CL량은 알코올군에서 감소하는 경향을 보였고 PS와 PI량은 차이가 없었다. 알코올 섭취로 PC량은 유의적으로 증가하였으나 PE량은 차이가 없엇으며, 2-AAF 투여시 PC량은 유의적인 감소를 보였고 PE량은 유의적으로 증가하였다. PE/PC 비율은 알코올 투여에 의해 유의성은 없었으나 감소경향을 나타냈으며, 2-AAF 투여에 의해서는 유의적인 증가 효과가 나타났다. 5. 알코올 섭취시 미토콘드리아의 지방산 조성은 palmitic acid가 유의적으로 감소하였고, stearic acid는 유의적으로 증가함을 보였다. UFA/SFA와 UI는 알코올군에서 유의적이지는 않으나 증가되는 경향을 보였다. 2-AAF 투여에 의해서도 linoleic acid는 감소되고 arachidonic acid는 증가되는 경향을 보여 UI값이 증가되는 경향이 있었다. 따라서 본 실험에서 나타난 ATPase 호라성도 변화는 비토콘드리아의 콜레스테롤변화, C/PL 비율, 인지질 조성이나 지방산 조성의 변화 등 막지질 조성의 변화에 기인하는 것으로 생각된다.

Keywords

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