Effect of Ascorbic Acid Supplementation on Hepatic Microsomal and Mitochondrial Cytochrome P450 System in Diabetic Rats

비타민 C의 보강이 당뇨쥐의 간 소포체와 미토콘드리아의 Cytochrome P450계에 미치는 영향

  • 정연재 (서울대학교 식품영양학과) ;
  • 임은영 (서울대학교 식품영양학과) ;
  • 김해리 (서울대학교 식품영양학과)
  • Published : 1997.08.01

Abstract

This study was performed to investigate whether ascorbic acid can modulate the induction of CYP2E1 and prevent the lipid peroxidation which may cause diabetic chronic complication. Diabetes was induced by intraperitoneal injection of streptozotocin to 5-week-old male Sprague-Dawley rats(150~170g). Normal and diabetic group was randomly divided into three groups each; Control(CON, no supplementation), SUP1 (50mg/d ascorbate supplementation) and SUP2(250mg/d ascorbate supplementation). Ascobic acid was prepared daily by dissolving in drinking water and supplied for 4 weeks. There was no difference in hepatic microsomal and mitochondrial P450 contents between normal and diabetes. Hepatic microsomal N-nitrosodimethylamine(NDMA) demethylase activity, which repre-sents contents of CYP2E1, was elevated in diabetes, but not significantly. The NDMA demethylase activity of diabetic SUP2 group was significantly lower activity than that of the diabetic CON group. However, no difference in hepatic mitochondrial NDMA demethylase activity was observed between the diabetes and the normal group. The result suggests that the induction of CYP2E1 in diabetes can be alleviated by ascorbic acid supplementation at the dose of 50mg1d. In addition, ascorbic acid supplementation showed dose-dependent reduction of hepatic microsomal TBARS contents in diabetic rats.

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