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mTOR and autophagy in normal brain aging and caloric restriction ameliorating age-related cognition deficits
Fengying Yang 1,Xiaolei Chu 2,Miaomiao Yin 3,Xiaolei Liu 1,Hairui Yuan 1,Yanmei Niu 1 #,Li Fu 1 *
1.Department of Rehabilitation and Sports Medicine, Tianjin Medical University, Tianjin 300070, China
2.Department of Rehabilitation, Tianjin Hospital, Tianjin 300211, China
3.Department of Rehabilitation, Tianjin Huanhu Hospital, Tianjin 300060, China
*Correspondence author
#Submitted by
Subject:
Funding: the Science Foun-dation of Tianjin Medical University （No.No. 2010ky19）, the Chinese Education Committee funding for the mentoring of a Ph.D. student （No.No. 2012202110015）, the National Natural ScienceFoundation of China （No.No.31100856）
Opened online:17 May 2016
Accepted by: none
Citation: Fengying Yang,Xiaolei Chu,Miaomiao Yin.mTOR and autophagy in normal brain aging and caloric restriction ameliorating age-related cognition deficits[OL]. [17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4687384
 
 
Defect of autophagy is common to many neurodegenerative disorders because it serves as a major degradation pathway for the clearance of various aggregate-prone proteins. Mammalian target of rapamycin (mTOR) signaling, which is recognized as the most important negative regulator of autophagy, is also involved in neurodegenerative diseases. However, the role of mTOR and its dependent autophagy in normal brain during aging remains unknown. Furthermore, caloric restriction (CR) is frequently used as a tool to study mechanisms behind aging and age-associated diseases because CR can prevent age-related diseases and prolong lifespan in several model organisms. Inhibiting mTOR and promoting autophagy activity play roles in aging delayed by CR. However, whether CR can ameliorate age-related cognition deficits by inhibiting mTOR and activate autophagy in hippocampus needs to be further investigated. Here we showed a decline of autophagic degradation in mice hippocampus in correlation with age-dependent cognitive dysfunction, whereas the activity of mTOR and its upstream brain-derived neurotrophic factor (BDNF)/phosphatidylinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling was decreased with aging. In addition, facilitating the mTOR pathway successfully declines and sustains autophagic degradation with aging in hippocampus by CR treatment and is involved in CR by ameliorating age-related cognitive deficits.
Keywords:Cognition; Mammalian target of rapamycin; Autophagy; Caloric restriction; Hippocampuskey
 
 
 

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