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Effects of Short Term Antioxidant Cocktail Supplementation on the Oxidative Stress and Inflammatory Response of Renal Inflammation in Diabetic Mice

당뇨 쥐의 신장 염증 단계에서 단기간의 혼합 항산화 영양소 보충 식이가 산화적 스트레스와 염증반응의 조절에 미치는 영향

  • Park, Seul-Ki (Department of Food and Nutrition, Research Institute of Human Ecology, Kyunghee University) ;
  • Park, Na-Young (Department of Food and Nutrition, Research Institute of Human Ecology, Kyunghee University) ;
  • Lim, Yun-Sook (Department of Food and Nutrition, Research Institute of Human Ecology, Kyunghee University)
  • 박슬기 (경희대학교 생활과학대학 식품영양학과, 생활과학연구소) ;
  • 박나영 (경희대학교 생활과학대학 식품영양학과, 생활과학연구소) ;
  • 임윤숙 (경희대학교 생활과학대학 식품영양학과, 생활과학연구소)
  • Published : 2009.12.31

Abstract

Diabetes mellitus is a multifactorial disease. Particularly, diabetic nephropathy is a serious complication for diabetic patients, yet the precise mechanisms that underline the initial stage of diabetic renal inflammation remain unknown. However, oxidative stress induced by hyperglycemia in diabetes is implicated in diabetic renal disease. We hypothesized that dietary supplementation of antioxidants either VCE (0.5% VC + 0.5% VE) or Comb (0.5% VC + 0.5% VE + 2.5% N-acetylcysteine) improves acute diabetic renal inflammation through modulation of blood glucose levels and antioxidant and anti-inflammatory responses. Experimental animals (5.5 weeks old female ICR) used were treated with alloxan (180 mg/kg) once. When fasting blood glucose levels were higher than 250 mg/dL, mice were divided into 3 groups fed different levels of antioxidant supplementation, DM (diabetic mice fed AIN 93G purified rodent diet); VCE (diabetic mice fed 0.5% vitamin C and 0.5% vitamin E supplemented diet); Comb (diabetic mice fed 0.5% vitamin C, 0.5% vitamin E and 2.5% N-acetylcysteine supplemented diet), for 10 days and then sacrificed. Body weights were measured once a week and blood glucose levels were monitored twice a week. Lipid peroxidation products, thiobarbituric acid reacting substances were measured in kidney. NF-${\kappa}B$ activation was indirectly demonstrated by pI${\kappa}B$-${\alpna}$ and expressions of selective inflammatory and oxidative stress markers including antioxidant enzymes were also determined. Dietary antioxidant supplementation improved levels of blood glucose as well as kidney lipid peroxi-dation. Dietary antioxidant supplementation improved NF-${\kappa}B$ activation and protein expression of HO-1, but not mRNA expression levels in diabetic mice fed Comb diet. In contrast, the mRNA and protein expression of CuZnSOD was decreased in diabetic mice fed Comb diet. However, antioxidant supplementation did not improve mRNA and protein expressions of IL-$1{\beta}$ and MnSOD in diabetic mice. These findings demonstrate that acute diabetic renal inflammation was associated with altered inflammatory and antioxidant responses and suggest that antioxidant cocktail supplementation may have beneficial effects on early stage of diabetic nephropathy through modulation of blood glucose levels and antioxidant enzyme expressions.

Keywords

References

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