Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Effects of coffee powder supplementation on the blood glucose and antioxidative enzyme activity of liver tissue in STZ-induced diabetic rats

커피가루 첨가식이가 당뇨 쥐의 혈당 및 간 조직 항산화효소 활성에 미치는 영향

  • Bae, Jihyun (The Graduate School of Pharmacy, Keimyung University) ;
  • Jung, Yun-Jung (Department of Food and Nutrition, Keimyung University) ;
  • Choi, Mi-Ja (Department of Food and Nutrition, Keimyung University)
  • 배지현 (계명대학교 약학대학원) ;
  • 정윤정 (계명대학교 식품영양학과) ;
  • 최미자 (계명대학교 식품영양학과)
  • Received : 2015.02.23
  • Accepted : 2015.03.25
  • Published : 2015.04.30
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Abstract

Purpose: The purpose of this study was to evaluate the role of coffee in diabetic rats in order to prevent hyperglycemia and hyperlipidemia, and to improve antioxidant enzyme activity in streptozotocin induced diabetic rats. Methods: Thirty two male Sprague-Dawley rats (body weight $200{\pm}5g$) were divided into two groups; diabetic and nondiabetic groups. The groups were each randomly divided into two subgroups; fed control and coffee (5 g coffee powder/kg diet) diets. Diabetes was induced by intramuscular injection of 50 mg streptozotocin/kg body weight. Rats with blood glucose concentrations ${\geq}300mg/dL$ were considered diabetic for these experiments. All rats were fed an experimental diet and deionized water ad libitum for 4 weeks. Results: The results of this study indicate that body weight gain was significantly lower in diabetic groups than in nondiabetic groups regardless of diet. Mean food intake was significantly higher in diabetic groups than in nondiabetic groups, and significantly higher in the coffee group than in the control group in diabetic rats. Food efficiency ratio (FER) was significantly lower in diabetic groups than in nondiabetic groups regardless of diet. The fasting blood glucose of coffee supplemented groups was significantly lower compared with the control group in diabetic and nondiabetic rats. The levels of serum LDL-cholesterol and atherogenic index were significantly lower in the coffee group than in the control group in diabetic and nondiabetic rats, and serum HDL-cholesterol was significantly higher in the coffee group than in control groups. The contents of hepatic triglyceride were significantly lower in the coffee group than in the control group in diabetic and nondiabetic rats. The lipid peroxidation of malondialdehyde (MDA) contents was significantly lower in the coffee group than in the control group in diabetic and nondiabetic rats. Activity of superoxide dismutase (SOD), glutathione peroxidase (GPx) and catalase in liver was not significantly different by experimental diets among all groups. Conclusion: In conclusion, effects of 0.5% coffee powder supplemented diet were beneficial on blood glucose and lipids in diabetic rats.

커피첨가식이를 섭취한 당뇨 쥐에서 혈당, 혈중 지질농도, 간지질함량 및 간조직의 항산화효소인 SOD, GPx, CAT에 미치는 영향을 분석한 결과를 요약하면 다음과 같다. 실험시작 시 체중은 실험군 간에 유의적인 차이가 없었고 실험종료 시 체중은 당뇨군내에서 커피군이 대조군보다 유의적으로 높았으며, 실험기간동안 체중증가량은 당뇨군이 비당뇨군보다 유의적으로 낮았으나 커피첨가식이 섭취에 따른 유의적인 차이는 없었다. 평균 식이섭취량은 당뇨군이 비당뇨군보다 유의적으로 높았고, 당뇨군내에서는 커피군이 대조군보다 유의적으로 높았으며, 식이효율은 당뇨군이 비당뇨군보다 유의적으로 낮았으나 커피섭취에 따른 유의적인 차이는 없었다. 당뇨군과 비당뇨군 모두 혈중 HDL-콜레스테롤 농도는 커피군이 대조군보다 유의적으로 높았고, LDL-콜레스테롤 농도와 atherogenic index는 커피군이 대조군보다 유의적으로 낮았다. 간의 중성지방 함량은 당뇨군과 비당뇨군 모두 커피군이 유의적으로 낮았고, 총콜레스테롤 함량은 커피섭취에 따른 유의적인 차이가 없었다. 간 조직의 MDA 함량은 당뇨군과 비당뇨군 모두 커피군이 대조군보다 유의적으로 낮았다. 간 조직의 항산화효소인 SOD, GPx, CAT 활성은 당뇨군과 비당뇨군 모두 커피섭취에 따른 유의적인 차이는 없었다. 혈당은 당뇨군과 비당뇨군 모두 커피군이 대조군보다 유의적으로 낮았다. 결론적으로 당뇨 쥐에서 0.5% 커피첨가식이가 간의 항산화효소 활성에는 유의적인 영향이 없었으나, 당뇨 쥐의 혈당을 낮추었고, 혈중 HDL-콜레스테롤 농도는 높였으며, 혈중 LDL-콜레스테롤 농도, atherogenic index, 간 중성지방 함량 및 과산화지질 MDA는 낮추어 혈당과 혈중 및 간 지질 개선에 도움이 되는 것으로 나타났다.

Keywords

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