Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Effects of Vitamin E Supplementation on Renal Glycosylation Products in Diabetic KK Mice

당뇨 KK마우스에서 비타민 E 보강식이가 신장 당화단백질 생성에 미치는 영향

  • 안현숙 (서울대학교 식품영양학과) ;
  • 박성연 (서울대학교 식품영양학과) ;
  • 김해리 (서울대학교 식품영양학과)
  • Published : 1998.07.01
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Abstract

We investigated the effects of vitamin E supplementation on protein glycosylation in early and end stage product, and light microscopic studies were done on the renal glomeruli of KK-mice of various ages and various duration of diabetes. Weaned KK-mice were fed high fat diets containing 20% corn oil(wt/wt), and sacrificed at 4,6, and 9 months of age. The high vitamin E diet was a high fit diet supplemented with an excess amount of d1-$\alpha$-tocopheryl acetate (2080IU/kg diet). We measured Hemoglobin $A_{IC}$ (Hb $A_{IC}$) as a glycosylation early product, and renal collagen-linked fluorescence as a glycosylation end product. In the diabetic group, levels of Hb $A_{IC}$ were increased within 2 months after onset of diabetes and remained at a constant level for the duration of experiment. 5 months after onset of diabetes, renal collagen linked fluorescence(CLF) was markedly increased. A quantative, morphologically demonstratable, progressive thickening of the basement membrane and calcification occured in the diabetic KK-mice. There is a statiscally positive correlation between CLF and histologic grade of diabetic nephropathy. Hepatic vitamin E levels correlated with those of Hb $A_{IC}$, renal CLF, and renal calcification. Treatment with vitamin I did not modify the level of blood glucose. However, we observered a significant lowering of CLF and Hb $A_{IC}$ in diabetic mice. Supplementation of vitamin E was found to delay the progression of diabetic nephropathy. (forean J Nutrition 31(6) : 1024-1030, 1998)0, 1998)

KK마우스에 고지방 식이를 섭취시켜 당뇨를 유발하고, Maillard 반응의 초기산물인 Hb $A_{IC}$와 후기 산물인 신장조직의 CLF가 증가되는지를 확인하고. 당뇨병에 의해 증가되는 Maillard 반응이 비타민 I의 투여로 억제되는지 관찰하였다. 또 신장조직의 광학 현미경 관찰을 통하여 신장병변을 검사하였다. 이유즉시 KK마우스를 1개월간 pellet diet로 적응시킨 후 저비타민 E 식이(corn oil 20%, wt/wt)를 먹여 당뇨를 유도하였다. 비타민 E 보강은 2080IU/kg diet 수준으로 하였으며. 생후 4개월 , 6개월 . 9개월(당뇨 0개월. 2개월, 5개월)에 희생시켰다. 정상 KK-마우스에서는 월령이 증가하였을 때. 혈당과 Hb $A_{IC}$는 유의적인 변화를 보이지 않았으나 신장조직의 CLF는 점진적으로 증가되었다. 당뇨군에서 Hb $A_{IC}$는 6개월에서 증가되기 시작하였고 9개월군과 차이가 없었으며 . 신장조직의 CLF는 9개월 군에서 급격히 증가하였다. 또 고비타민 E 식이를 섭취시킨 경우 당뇨군에서 초기 및 후기 Maillard 반응생성물의 감소가 관찰되었다. 이상의 결과로부터 KK마우스에서는 월령이 증가함에 따라 초기 및 후기 당화산물의 축적과 신장 병변의 변화가 관찰되었고, 또한 당뇨 유발에 의해 이 변화들은 더욱 촉진되었으나, 2080IU/kg diet 수준의 고비타민 E 식이를 섭취시켰을 때 이런 변들이 억제되었음을 확인하였다.확인하였다.

Keywords

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