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Effect of Dietary Supplementation of β-Carotene on Hepatic Antioxidant Enzyme Activities and Glutathione Concentration in Diabetic Rats

β-Carotene의 섭취가 당뇨 유도 흰쥐의 간조직 항산화효소 활성과 Glutathione 함량에 미치는 영향

  • Jang, Jung-Hyun (Dept. of Beauty Culture and Cosmetic, Dong Eui Institute of Technology) ;
  • Lee, Kyeung-Soon (Dept. of Food and Nutrition and Cooking, Taegu Science University) ;
  • Seo, Jung-Sook (Dept. of Food and Nutrition, Yeungnam University)
  • 장정현 (동의과학대학 미용계열) ;
  • 이경순 (대구과학대학교 식품영양조리계열) ;
  • 서정숙 (영남대학교 식품영양학과)
  • Received : 2011.03.25
  • Accepted : 2011.07.07
  • Published : 2011.08.31

Abstract

The present study was conducted to investigate the effect of ${\beta}$-carotene on the antioxidant system of rats with diabetes. Forty Sprague Dawley rats were fed the AIN-76 control diet or the same diet supplemented with ${\beta}$-carotene (7.2 mg/kg diet) for 3 weeks, then diabetes was induced in half the rats by administering streptozotocin (45 mg/kg BW) into the femoral muscle. Diabetic and normal rats were fed the experimental diets for 2 more weeks. To investigate the effect of dietary ${\beta}$-carotene on diabetes, the activities of antioxidative enzymes and glutathione concentration were determined in normal and streptozotocin-induced diabetic rats. The plasma glucose levels in diabetic rats were not influenced by the dietary supplementation of ${\beta}$-carotene. Hepatic activities of catalase and superoxide dismutase in diabetic rats were significantly lower than those of control rats but ${\beta}$-carotene tended to induce these activities. Glutathione-S-transferase activity was not significantly different between experimental groups. Glucose-6-phosphatase activity was induced in diabetic rats, but dietary supplementation of ${\beta}$-carotene reduced this activity. The hepatic concentration of reduced glutathione in diabetic rats was lower than that of control rats, but dietary supplementation with ${\beta}$-carotene restored the content to some extent. These data suggest that diabetic rats are exposed to increased oxidative stress and that dietary supplementation with ${\beta}$-carotene may reduce its detrimental effects.

본 연구에서는 당뇨병의 치료에 중요한 저해요인으로 제기되고 있는 당뇨합병증을 예방하고자 녹황색 채소 등을 통해 식사 시 한국인들이 쉽게 섭취할 수 있는 ${\beta}$-carotene의 혈관계 합병증 예방효과를 분석하고자 하였다. 간 미토콘드리아에서의 catalase 활성은 ${\beta}$-carotene을 급여한 비당뇨군에서 유의적으로 높은 활성을 나타내었으나 당뇨군에서는 ${\beta}$-carotene 급여에 의한 영향을 나타내지 않았다. 간 사이토졸 내의 superoxide dismutase 활성은 ${\beta}$-carotene을 급여하지 않은 당뇨군에서 그 활성이 가장 저하되었으나 ${\beta}$-carotene 공급에 의해 유의적으로 증가되었다. 간 사이토졸 내의 glutathione-S-transferase 활성은 ${\beta}$-carotene의 급여에 의한 차이가 없었다. 간 마이크로솜에서의 glucose-6-phosphatase 활성은 대조군에 비하여 ${\beta}$-carotene을 급여하지 않은 당뇨군에서 유의적으로 높게 나타났으나 ${\beta}$-carotene을 급여한 당뇨군에서는 활성이 유의적으로 저하되었다. 간조직의 환원형 glutathione 함량은 당뇨군에서 유의적으로 감소되었으며, 당뇨군에서 ${\beta}$-carotene의 급여로 증가하였다. 이상의 결과에서 볼 때 ${\beta}$-carotene의 섭취는 당뇨 유도에 의한 산화스트레스가 증가된 생리적 상태에서 glutathione의 소모를 감소시키고, 항산화 효소계 중 특히 superoxide dismutase 활성을 유도하여 과산화 라디칼을 환원시킴으로써 활성산소에 의해 유발되는 산화적 손상의 일차적 방어에 관여한 것으로 여겨진다. 따라서 인체시험 등을 통한 후속연구와 연계하여 ${\beta}$-carotene 수준을 적절하게 보충 섭취한다면 당뇨로 인한 항산화계 활성의 변화를 조절함으로써 산화스트레스에 대한 보호효과를 나타내어 당뇨병 합병증의 예방에 기여할 수 있을 것으로 여겨진다.

Keywords

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