PubMed: 27087442

Title
APOE4 Induces Site-Specific Tau Phosphorylation Through Calpain-CDK5 Signaling Pathway in EFAD-Tg Mice.
Journal
Current Alzheimer research
Volume
13
Issue
None
Pages
1048-55
Date
2016-01-01
Authors
Zhu Y | Zhou M | Chen X | Collins N | Dai X | Huang T | LaDu MJ | Lin L | Shen H | Wei Z | Wu X | Xiao N | York J | Zhang J

Evidence 7c0bde3e72

We demonstrated that the treatment of cultured hippocampal neurons with 125 µM glutamate for 20 min induced the cleavage of p35 to produce the p25 fragment 6 h after glutamate treatment, and the maximal levels of p25 were detected at 12 h (Fig. 1A), which is consistent with a peak in tau hyperphosphorylation (AT8).

Evidence a4e53af880

Our data showed that CDK5 knock down induced an increase in p35 protein levels and Rac activity in triple transgenic Alzheimer's mice, which correlated with the recovery of cognitive function; these findings confirm that increased p35 and active Rac are involved in neuroprotection. In summary, our data suggest that p35 acts as a mediator of Rho GTPase activity and contributes to the neuroprotection induced by CDK5 RNAi.

Evidence 666e2b48d8

The levels of CDK5, its regulatory subunits (p35 and p25) and calpain (including calpain1 and calpain2), but not GSK3ß, were significantly increased in E4FAD mice compared to E3FAD mice.

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