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Effects of YK-209 Mulberry Leaves on Antioxidative Defense System of Liver in Streptozotocin-Induced Diabetic Rats

YK-209 뽕잎이 Streptozotocin 유발 당뇨쥐 간조직의 항산화계에 미치는 영향

  • 유수경 (대구카톨릭대학교 식품영양학과) ;
  • 이순재 (대구카톨릭대학교 식품영양학과)
  • Published : 2002.12.01

Abstract

The purpose of this study was investigated the effects of YK-209 mulberry leaves on antioxidative defense system of liver in diabetic rats induced with streptozotocin (STZ). Male Sprague-Dawley rats weighing 100$\pm$10 g were randomly assigned to one normal and four STZ-induced diabetic groups; YK-209 mulberry leaves free diet (DM group),0.1% YK-209 mulberry leaves diet (DM-0.1Y group),0.2% YK-209 mulberry leaves diet (DM-0.2Y group) and 0.4% YK-209 mulberry leaves diet (DM-0.4Y group). Diabetes was induced by intravenous Injection of 55 mg/kg body weight of STZ in sodium citrate buffer (pH 4.3) via tail vein after 4 weeks feeding of experimental diets. Rats were sacrificed at the 9th day of diabetic states. Liver weight in all four diabetic groups were higher than normal group, but YK-209 mulberry supplementation groups were lower than DM group. Hepatic superoxide dismutase (SOD) activity was significantly decreased in all diabetic groups, compared with normal group. Hepatic glutathione peroxidase (GSHpx) activity was 7.3% decreased in DM group, compared with normal group, but those of DM-0.1Y and DM-0.2Y groups were maintained the normal level. The hepatic thiobarbituric acid reactive substances was markedly increased by 144% in DM group, compared with normal group, but those of DM-0. 1Y, DM-0.2Y groups were maintained the normal level. The contents of lipofuscin in liver were increased by 100% in DM group compared with normal group, but those of DM-0. 1Y, DM-0.2Y and DM-0.4Y groups were decreased to 42% 43% and 44%, respectively, compared with DM group. The hepatic superoxide radical (0$^2$-) contents in DM group were increased to 81%, compared with normal group, but those of DM-0.1Y and DM-0.4Y groups were similar to those of normal group. The present result indicate that YK-209 mulberry leaves regarded to suppress lipid peroxidation as an free radical scavenger system by the inhibition of oxidative stress.

YK 209 뽕잎이 STZ 유발 당뇨쥐 간조직의 항산화계에 미치는 영향을 관찰코져 하였다. Sprague Dawley 흰쥐 수컷을 정상군(normal group)과 STZ 유발 당뇨군으로 나누고 당뇨군은 다시 식이내 YK-209뽕잎 함량에 따라 각각 YK-209뽕잎을 공급하지 않은 당뇨대조군(DM group),0.1% 뽕잎 공급군(DM-0.IY group), 0.2% 뽕잎 공급군(DM-0.2Y group) 및 0.4% 뽕잎 공급군 (DM-0.4Y group)으로 나누어 자유섭식 시켰다. 3주후 STZ으로 당뇨를 유발한 후 9일째에 희생하였다. 단위체중당 간무게는 정상군에 비해 당뇨군 모두 유의적으로 증가되었으나 뽕잎 비공급 당뇨군(DM group)에 비해 뽕잎공급군들은 감소되었다. 간조직중의 SOD 활성은 정상군에 비해 당뇨유발군에서 유의적으로 감소하였으며 뽕잎공급으로 인한 차이는 없었다. GSHpx 활성은 정상군에 비해 DM군은 7.3%저하되었으나, DM-0.1Y, DM-0.2Y군은 정상군 수준이었다. 간조직 중의 지질과산화가는 정상군에 비해 DM군은 144%증가되었으나 DM-0.1Y, DM-0.2Y군은 정상군 수준이었다. 리포푸신 함량은 정상군에 비해 DM군에서 100%증가되었으나 YK-209 뽕잎 공급군은 DM군에 비해 유의적으로 감소되었다. 간조직 중의 superoxide radical(O$_2$ ) 함량은 정상군에 비해 DM군에서는 81% 증가되었으나 DM-0.1Y군과 DM-0.4Y군은 정상군과 유의적인 차이가 없었다. 이상의 결과에서 YK-209 뽕잎은 항산화계를 강화시켜 조직의 산화적 손상을 감소시키므로서 산화적 스트레스 억제 효과가 있었다.

Keywords

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