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 Diets with Mulberry Leaf and Cudrania tricuspidata Leaf Powder Supplements on Blood Glucose-Related Biomarkers in Streptozotocin-Induced Diabetic Rats

뽕잎 및 꾸지뽕잎 첨가식이가 Streptozotocin 유발 당뇨쥐의 혈당관련 바이오마커에 미치는 영향

  • Received : 2012.02.15
  • Accepted : 2012.04.03
  • Published : 2012.06.30
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Abstract

This study investigates the effects of diets with mulberry leaf and Cudrania tricuspidata leaf supplements on blood glucose-related biomarkers in streptozotocin-induced diabetic rats. Male diabetic Sprague-Dawley rats were divided into groups and fed several diets. Group A was fed a diet with a 10% supplement of mulberry leaves. Group B was fed a diet with a 10% supplement of mulberry leaves and an additional 10% supplement of Cudrania tricuspidata leaves. Group C was fed a diet with a 10% supplement of mulberry leaves and an additional 30% supplement of Cudrania tricuspidata leaves. Group D was fed a diet with a 10% supplement of Cudrania tricuspidata leaves. Group E was the DM control. All diets were based on AIN-93G diet and they all lasted 6 weeks. The blood glucose levels of groups B and C stayed similar to initial levels (reference blood glucose) for the experimental period, which was significantly lower than levels in groups A, D, and E at the 6th week (p<0.05). And the area under the blood glucose curve (AUC) was also significantly lower in groups B and C than in groups D and E (p<0.05). The fasting blood glucose level after the experiment was significantly lower in groups B and C (p<0.05), and the C-peptide content of group C was as high as 50 pmol/L on average. The HbA1c content was also significantly lower in groups A and B than in group E (p<0.05). The serum TG, AST, and ALT levels were significantly decreased in groups A, B, and D than in group E (p<0.05). From the findings, it is shown that a diet of 1:1 mulberry and Cudrania tricuspidata leaf supplements could improve blood glucose-related biomarkers.

뽕잎 및 꾸지뽕잎이 당뇨쥐의 혈당관련 바이오마커(biomarkers)에 미치는 영향을 조사하고자 SD계 수컷 흰쥐에게 STZ 투여(47.5 mg/kg bw) 후 7일 뒤 혈당치가 350 mg/dL 내외되는 쥐를 선별하여 실험군당 8마리씩 배치하고, AIN-93G를 기본식이로 하여 뽕잎 10% 첨가군(A), 뽕잎 10%와 꾸지뽕잎 10%(B) 및 30%(C) 혼합 첨가군, 꾸지뽕잎 10% 첨가군(D), 당뇨대조군(E)으로 나누어 각 실험식이를 6주간 급여한 결과는 다음과 같다. 실험기간 동안 B군과 C군의 혈당치는 실험식이 급여 전 기준혈당치와 비슷한 수준을 유지하였고 실험 6주째의 경우 E군 및 A, D군에 비해 유의하게 낮았다(p<0.05). 기준혈당 대비 6주 후 혈당상승률은 B군과 C군이 각각 6.7, 7.6%로 E군(29.2%)에 비해 상대적으로 낮았으며, 6주간 혈당치의 곡선하면적(AUC)도 B, C군이 D, E군보다 유의하게 낮았다(p<0.05). 실험종료 후 공복혈당 역시 B, C군이 D, E군에 비해 통계적으로 유의하게 낮았고(p<0.05), C-peptide 함량은 C군이 다른 군에 비해 평균 50 pmol/L 가량 높았으나 유의적인 차이는 없었으며, 당화혈색소(HbA1c) 함량은 A군과 B군이 E군보다 유의하게 낮았다(p<0.05). 혈청 총콜레스테롤(TC) 농도는 E군에 비해 실험시료 급여군이 평균 14% 감소하였고, HDL-콜레스테롤 농도는 시료 처리군이 E군보다 평균 27% 증가하였으나 실험군 간에 유의적인 차이는 없었으며, 중성지방(TG) 농도는 E군에 비해 A, B, D군에서 유의적으로 감소하였다(p<0.05). 간기능치 중 AST 및 ALT 활성은 E군보다 A, B, D군에서 통계적으로 유의하게 감소하였다(p<0.05). 이상의 결과에서 뽕잎 및 꾸지뽕잎 첨가식이 중 이들을 1:1로 혼합하여 STZ로 유도한 당뇨쥐에게 급여하였을 때 혈당상승을 억제하고 혈당관련 지표성분, 그리고 혈청 지질농도 및 간기능치 개선에도 다소간의 효과를 확인할 수 있었다.

Keywords

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