달리기 운동이 streptozotocin-유도 당뇨쥐의 가자미근 당수송체(GLUT4)와 소포관련 막단백질(VAMP2) 발현에 미치는 효과
The effect of running exercise training on GLUT4 and VAMP2 protein expression in soleus muscle of streptozotocin-induced diabetes rats
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박성태, 서태범, 백성수, 정영수, 오명진, 김종오, 이희혁, 정일규, 윤진환. 달리기 운동이 streptozotocin-유도 당뇨쥐의 가자미근 당수송체(GLUT4)와 소포관련 막단백질(VAMP2) 발현에 미치는 효과. 운동과학, 제14권 제4호, 545-554, 2005. 본 연구의 목적은 6주간의 달리기 운동이 streptozotocin으로 유도된 당뇨쥐의 가자미근 GLUT4와 VAMP2 단백질 발현에 어떠한 영향을 미치는 지를 검증하는데 있다. 생후 8주령의 Sprague- Dawley계 흰쥐 수컷 24마리를 4집단으로 나누어 정상 통제군, 당뇨 통제군, 정상 운동군, 당뇨 운동군으로 구분하였다. 운동 프로토콜은 실험동물용 전동 트레드밀을 이용하여 경사도 0%, 속도 15m/min로 달리기 운동을 30분간 실시하도록 하였고, 주당 5회, 6주간 운동하도록 하였다. 모든 실험 처치 후 48시간 후에 실험쥐들을 마취한 후 혈중 글루코스를 꼬리정맥에서 채혈하여 분석하였고, 가자미근 GLUT4와 VAMP2의 단백질 발현량을 측정하기 위하여 가자미근의 일정량을 적출하여 Western blotting을 실시하였다. 그 결과, 혈중 글루코스는 당뇨군들이 모두 정상군들보다 유의하게 높은 수준을 나타내었고, 당뇨 운동군은 당뇨 통제군에 비해 유의하게 낮은 수준을 나타내었다. STZ 유발 당뇨쥐는 정상쥐에 비해 GLUT4와 VAMP2 단백질의 현저히 낮은 발현을 확인하였고, 당뇨쥐에 대한 지구성 운동 트레이닝은 당뇨쥐의 GLUT4와 VAMP2 단백질 발현을 증가시킨 것을 확인하였다. 결론적으로 운동 트레이닝을 통해 글루코스 흡수에 관여하는 단백질의 발현을 증가시킴으로써 당뇨로 높아진 혈당 수준이 감소한 것을 확인하였다.
Abstract
Park, S.T., Seo, T.B., Baek, S.S., Chung, Y.S., Oh, M.J., Kim, J.O., Lee, H.H., Jeong, I.G., Yoon, J.H. The effect of running exercise training on GLUT4 and VAMP2 protein expression in soleus muscle of streptozotocin-induced diabetes rats. Exercise Science, 14(4), 545-554, 2005. The purpose of this study was to examine the effect of exercise training on GLUT4 and VAMP2 protein expression in soleus muscle of streptozotocin(STZ)-induced diabetes rats. Sprague- Dawley rats were randomly divided into four groups : normal control(NC, n=6), normal exercise(NE, n=6), diabetes control(DC, n=6) and diabetes exercise(DE, n=6). Exercise training groups were made to run on a motorized treadmill by moderate intensity for 30 min a day, five days for 6 weeks. The results of this study were that in blood glucose level, STZ-induced diabetes rats were remarkably higher than normal rats and DE was significantly low compared to DC. Expression of GLUT4 and VAMP2 protein in DC were significantly low compared to NC, NE and DE was significantly higher than DC. In conclusion, we suggest that exercise training increase expression of GLUT4 and VAMP2, proteins involved with glucose uptake, so these effects can decrease STZ- induced blood level.
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