Title |
Conditional inactivation of Akt three isoforms causes tau hyperphosphorylation in the brain
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Published in |
Molecular Neurodegeneration, July 2015
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DOI | 10.1186/s13024-015-0030-y |
Pubmed ID | |
Authors |
Long Wang, Shanshan Cheng, Zhenyu Yin, Congyu Xu, Shuangshuang Lu, Jinxing Hou, Tingting Yu, Xiaolei Zhu, Xiaoyan Zou, Ying Peng, Yun Xu, Zhongzhou Yang, Guiquan Chen |
Abstract |
Tau hyperphosphorylation plays a critical role in neurodegenerative diseases [EMBO Mol Med. 6:1142-60, 2014; Annu Rev Neurosci. 24:1121-59, 2001]. Recent evidence has shown that Akt is down-regulated in AD [J Pathol. 225:54-62, 2011]. However, it remained unknown which pathological process, e.g. tau pathology or neuron death, Akt may contribute to. In this study, Cre-loxP technique was employed to generate a viable Akt three isoforms conditional knockout (Akt cTKO) mouse in which total Akt levels were dramatically reduced in the adult brain. Significantly increased levels of tau phosphorylated (p-tau) at various sites were observed in Akt cTKO mice as compared to age-matched littermate controls. Increased levels for phosphorylated GSK3α and phosphorylated PKA substrates were detected in Akt cTKO brains. In contrast, no significant changes on p-tau levels were found in Akt1 (-/-), Akt2 (-/-) or Akt3 (-/-) mice. Akt may regulate tau phosphorylation in the adult brain by affecting activities for PKA and GSK3α. |
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