期刊
NEUROBIOLOGY OF DISEASE
卷 66, 期 -, 页码 43-52出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2014.02.006
关键词
Focal cerebral ischemia; Akt; Stroke; mTOR; PRAS40; PTEN
资金
- AHA [10GRNT4200024, 1R01NS064136-01]
- National Natural Science Foundation of China [81200890]
The proline-rich Akt substrate of 40 kDa (PRAS40) protein is not only a substrate of the protein kinase Akt but also a component of the mTOR complex 1 (mTORC1), thus it links the Akt and the mTOR pathways. We investigated the potential protective role of PRAS40 in cerebral ischemia and its underlying mechanisms by using rats with lentiviral over-expression of PRAS40 and mice with PRAS40 gene knockout (PRAS40 KO). Our results show that gene transfer of PRAS40 reduced infarction size in rats by promoting phosphorylation of Akt, FKHR (FOX01), PRAS40, and mTOR In contrast, PRAS40 KO increased infarction size. Although the PRAS40 MO under normal condition did not alter baseline levels of phosphorylated proteins in the Akt and mTOR pathways, PRAS40 KO that underwent stroke exhibited reduced protein levels of p-S6K( and p-S6 in the mTOR pathway but not p-Akt, or p-PTEN in the Alct pathway. Furthermore, co-immunoprecipitation suggests that there were less interactive effects between Ala and mTOR in the PRAS40 KO. In conclusion, PFtAS40 appears to reduce brain injury by converting cell signaling from Akt to mTOR. (C) 2014 Published by Elsevier Inc.
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