| 제목 |
Effects of aerobic exercise on tau and related proteins in rats with photochemical infarct |
| 소속 |
Inha University Hospital, Department of Rehabilitation Medicine1, Baekseok University, Department of Occupational Therapy2, Inha University Hospital, Department of Pharmacology3 |
| 저자 |
Kyung-Lim Joa1*†, Kyoung-Hee Lee2, Hyeong-Eun Jeon1, Ju-Hee Kang3 |
Objective: Recent evidence indicates brain ischemia is associated with accumulations of abnormal tau and related proteins. However, the effects of aerobic training on these proteins have not been evaluated. We aimed to evaluate the effect of aerobic exercise on the phosphorylation and acetylation of tau and on the expressions of tau related proteins in a rat stroke model and to compare the effects of aerobic exercise with those observed in our previous study on task specific training (TST).
Methods: Twenty-four Sprague–Dawley rats with photothrombotic cortical infarction were used in the current study. The rehabilitation group (RG) received treadmill training 40 min/day for 28 days, whereas the sedentary group (SG) did not receive any type of training. Functional tests such as the single pellet reaching task, rotarod, and radial arm maze tests were performed weekly for 4 weeks post-infarction.
Results: Levels of p-taus396 and p-AMPK were found to be lower in ipsilateral cortices in the RG than in the SG (p<0.05) (Fig. 1). Phosphorylated 5’-AMP-activated protein kinase (p-AMPK) levels in ipsilateral cortices were significantly lower in the RG compared with SG (Fig. 1). Levels of p-taus262, Ac-tau, p-GSK3S9, p-Akt, p-Sin1, and p-P70-S6K were significantly lower in ipsilateral than in contralateral cortices in the RG (p<0.05) (Fig. 2). Repeated ANOVA showed aerobic training significantly improved SPR success rates and rotarod test results over time in comparison with control group (F=4.171; p=0.020 and F=3.440; p=0.015, respectively) (Fig. 3). Repeated ANOVA also showed aerobic training significantly improved memory scores over time in comparison with control group (F=2.271; p=0.04).
Conclusion: Aerobic training inhibited the phosphorylation and acetylation of tau and modulated the expressions of tau related proteins after stroke by modifying the p70-S6K pathway and p-AMPK. By comparison with our previous study on the effects of TST, we have evidence to suggest that TST and aerobic exercise differ, although both types of rehabilitation inhibit tau phosphorylation and acetylation.
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