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두릅열수추출물이 당뇨유발 흰쥐의 간조직 중 유해 활성산소 대사효소계 활성에 미치는 영향

Effects of Aralia elata Water Extracts on Activities of Hepatic Oxygen Free Radical Generating and Scavenging Enzymes in Streptozotocin-Induced Diabetic Rats

  • 김명주 (대구산업정보대학 식품영양과) ;
  • 조수열 (영남대학교 식품영양학과) ;
  • 이미경 (경북대학교 식품생물산업연구소) ;
  • 신경희 (영남대학교 식품영양학과)
  • 발행 : 2004.04.01

초록

Wistar계 흰쥐에게 두릅열수추출물을 7주간 급여하였으며 당뇨유발은 희생 2주전 streptozotocin을 투여하여 혈당이 300 mg/dL 이상인 흰쥐를 대상으로 유해 활성 산소 대사계에 미치는 영향을 구명하였다. 간조직 중의 유해 활성산소 생성계인 P-450 함량과 XO 및 AD 활성은 정상군에 비하여 당뇨대조군에서 유의적으로 감소된 반면, AH 활성은 증가 되었다. 두릅열수추출물 급여로 이들 유해 활성 생성계 효소 활성 변화가 완화되는 것으로 나타났다. 또한 SOD, CAT, GSH-Px 및 GST, GR과 같은 유해 활성산소 제거계와 G6PD 효소들은 당뇨유발로 유의적인 증가를 보였으나, 두릅열수추출물 급여군에서는 이들 효소 활성이 낮았다. 당뇨유발로 항산화물질인 글루타티온 함량은 유의적으로 감소된 반면 지질과산화물 생성은 유의적으로 증가되었다. 그러나 두릅열수추출물 급여는 당뇨대조군의 이들 함량 변화를 유의적으로 억제하는 것으로 나타났다. 이상의 결과에서 두릅열수추출물 급여는 STZ 투여로 인한 유해 활성산소 대사계 변화를 완화시킬 뿐만 아니라 지질과산화물 생성을 억제함으로써 산화적 스트레스로 인한 당뇨합병을 예방할 수 있을 것으로 사료된다.

Oxidative stress is currently suggested as a mechanism underyling diabetes. Accordingly, the present study was designed to evaluate the effect of Aralia elate water extracts (AEW) on activities of hepatic oxygen free radical generating and scavenging enzymes in streptozotocin (STZ)-induced diabetic rats. Male Wistar rats divided into nondiabetic group, diabetic group, and diabetic-AEW supplemented group. The extract was supplemented in 1.14% of raw Aralia elata/kg diet for 7 weeks. Diabetes was induced by injecting STZ (55 mg/kg BW, ip) once 2 weeks before sacrifying. The hepatic cytochrome P-450 content, xanthine oxidase and aminopyrine N-demethylase activities were significantly lowered in the diabetic group compared to the nondiabetic group. Whereas, the activities of aniline hydroxylase and oxygen free radical scavenging enzymes, superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glucose-6-phosphate dehydrogenase and glutathione S-transferase, were significantly higher in the diabetic group than in the nondiabetic group. However, the supplementation of AEW normalized these enzyme activities in STZ-induced diabetic rats. When the AEW was supplemented with the diabetic rats, hepatic glutathione content was markedly elevated as well as lipid peroxide level was significantly lowered compared to those of the diabetic group. Thus, these results suggested that AEW supplement enhanced the activities of oxygen species metabolizing enzymes in STZ-induced diabetic rats.

키워드

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