Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Artemisia iwayomogi Ethanol Extract on Hypoglycemic and Antioxidant Activities in Diabetic Rats

더위지기 추출물이 당뇨 흰쥐의 혈당과 항산화 효소 활성도에 미치는 영향

  • Han, Hye Kyoung (Dept. of Food and Nutrition, College of Natural Science, Duksung Women's University)
  • 한혜경 (덕성여자대학교 자연과학대학 식품영양학과)
  • Received : 2012.08.31
  • Accepted : 2012.10.09
  • Published : 2012.12.31
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Abstract

This study was undertaken to evaluate the antihyperglycemic, antilipid peroxidative, and antioxidant effects of the ethanol extracts of Artemisia iwayomogi (Ai) in streptozotocin (STZ)-induced diabetic rats. Diabetes was induced in Sprague-Dawley rats with a single intravenous injection (45 mg/kg b.w.) of STZ. The diabetic rats were then randomized to the diabetic and Ai extract therapy groups which were treated with Ai extract at doses of 1, 2, and 3 g/kg b.w./day, respectively, for 14 days. Oral administration of Ai (2 g/kg b.w.) significantly decreased their intake of food. Dosage of 2 g/kg of the extract significantly decreased blood glucose levels in the glucose level in diabetic rats after 4 day, there was no significant difference observed at 1 and 3 g/kg. A dose of 2 or 3 g/kg of the Ai extract significantly reduced plasma glucose levels in STZ-induced hyperglycemic rats at 7 days. The hypoglycemic effect of Ai at a dose of 2 g/kg was significantly more effective than that of STZ-control. The effect was more pronounced in 2 g/kg than 1 g and 3 g/kg. A significant reduction in triglycerides (TG) and free fatty acids (FFA), and a significant increase in liver glycogen were observed in treated diabetic rats at doses of 2 g/kg after 14 days of treatment. Administration of Ai extracts to diabetic rats showed a significant decrease in liver malondialdehyde (MDA) levels. The activity of superoxide dismutase (SOD) was significantly increased in the 3 g extract-supplemented groups. The activities of glutathione peroxidase (GSH-px) and catalase (CAT) were significantly increased in the 1 g and 3 g extract-supplemented groups. Ai extract significantly increased glutathione-S transferase (GST) activity in a dose-dependent manner compared with treatment in STZ-control rats. Our result supports the fact that the administration of Ai extract is able to reduce hyperglycemia and hyperlipidemia risk, and also reduce the oxidative stress in diabetic rats.

더위지기 추출물이 STZ으로 유발된 당뇨쥐에서 혈당, 지질 및 항산화효소에 미치는 영향을 알아보고자 용량(1 g, 2 g 및 3 g/kg b.w.)을 달리하여 14일간 경구투여한 실험에서 다음과 같은 결과를 얻었다. 정상군을 비롯한 당뇨유발군, 당뇨유발에 더위지기를 투여시킨 군을 14일간 실험한 결과 STZ 투여로 식이섭취량은 증가된 반면 체중은 감소되었는데, 더위지기 추출물을 2 g 투여 시 체중증가량의 변화는 관찰되지 않은 반면 식이섭취량은 억제되었다. 장기의 상대적인 중량비교에서 신장의 경우 당뇨대조군에 비해 더위지기 추출물을 1 g 투여 시 비대가 유의적으로 억제되었다. 당뇨로 인하여 증가된 ALT 활성도는 더위지기 추출물을 2 g과 3 g 투여 시, AST 활성도는 1 g과 3 g 투여 시 당뇨대조군에 비해 유의적으로 감소되었다. 혈장 포도당 함량은 실험 4일째부터 실험 14일째까지 당뇨대조군에 비해 더위지기 추출물을 2 g 투여함으로써 혈당치가 저하됨을 관찰할 수가 있었으며, 간의 글리코겐 함량도 더위지기 추출물을 2 g 투여 시 유의적으로 증가하였다. 혈장의 중성지방과 유리지방산 함량은 더위지기 추출물 2 g 투여 시 당뇨대조군에 비해 유의적으로 감소하였다. 동맥경화지수는 더위지기 추출물을 투여한 모든 당뇨실험군에서 유의적으로 저하되는 것으로 나타났다. 간의 MDA 함량이 모든 Ai투여군에서 당뇨대조군보다 유의적으로 감소하였다. 간에서의 항산화 효소 중 SOD 활성도는 당뇨대조군에 비해 더위지기 추출물을 3 g 투여 시 유의적으로 증가하였다. CAT와 GSH-px 활성도는 당뇨대조군에 비해 더위지기 추출물을 1 g과 3 g 투여 시 유의적으로 증가하였다. GST 활성도는 당뇨대조군에 비해 모든 Ai투여군이 유의적으로 높았으며 용량의존적으로 차이를 보였다. 이상의 실험결과를 통해 더위지기 추출물은 당뇨로 인한 체중저하를 방지하고, STZ로 유도한 고혈당을 완화시키는 항당뇨작용과 더불어 항산화효소의 활성도를 증가시켜 산화스트레스 감소를 유도하여 고혈당에 의한 조직손상을 감소시켜 주는 것으로 사료된다.

Keywords

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