트레드밀 운동이 mutant (N141I) presenilin-2 유전자를 이식한 알츠하이머질환 모델 생쥐 뇌의 Aβ-42, cytochrome c, SOD-1, 2와 Sirt-3 단백질 발현에 미치는 영향

Abstract

The purpose of this study was to investigate the effects of treadmill exercise on Aβ-42, cytochrome c, SOD-1, 2 and Sirt-3 protein expressions in brain cytosol and mitochondria in mutant (N141I) presenilin-2 transgenic mice with Alzheimer's disease (AD). The mice were divided into four groups (Non-Tg-sedentary, n=5; Non-Tg treadmill exercise, n=5; Tg-sedentary, n=5; Tg treadmill exercise, n=5). To evaluate the neuroprotective effect of treadmill exercise, Non-Tg and Tg mice were subjected to exercise training on a treadmill for 12 wk, after which their brain cytosol and mitochondria were evaluated to determine whether any changes in the cognitive performance, Aβ-42 protein, cytochrome c protein, anti-oxidant enzymes (SOD-1, SOD-2) and Sirt-3 protein had occurred. The results indicated that treadmill exercise resulted in amelioration in cognitive deficits of Tg mice. In addition, the expressions of mitochondrial Aβ-42 and cytosolic cytochrome c protein were decreased in the brains of Tg mice after treadmill exercise, whereas antioxidant enzymes, SOD-1 and SOD-2 were significantly increased in response to treadmill exercise. Furthermore, treadmill exercise significantly increased the expression of Sirt-3 protein in Non-Tg and Tg mice. Taken together, these results suggest that treadmill exercise is a simple behavioral intervention which can sufficiently improve cognitive performance and inhibit Aβ-induced oxidative stress in AD.