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FoxO3a is activated and executes neuron death via Bim in response to beta-amyloid.

Authors: Sanphui, P  Biswas, SC 
Citation: Sanphui P and Biswas SC, Cell Death Dis. 2013 May 9;4:e625. doi: 10.1038/cddis.2013.148.
Pubmed: (View Article at PubMed) PMID:23661003
DOI: Full-text: DOI:10.1038/cddis.2013.148

The molecules that mediate death of selective neurons in Alzheimer's disease (AD) are mostly unknown. The Forkhead transcription factor FoxO3a has emerged as an important mediator of cell fate including apoptosis. When phosphorylated by Akt, it is localized in the cytosol as an inactive complex bound with 14-3-3 protein. For activation and localization of FoxO3a in the nucleus, further modifications are required, such as phosphorylation by mammalian sterile 20-like kinase 1 (MST1) and arginine methylation by protein arginine methyltransferase1. We report here that Akt-mediated phosphorylation of FoxO3a is diminished in neurons exposed to oligomeric beta-amyloid (Abeta), in vitro and in vivo. We also find that oligomeric Abeta activates FoxO3a by MST1 phosphorylation and arginine methylation in primary cultures of hippocampal and cortical neurons. Moreover, FoxO3a translocates from the cytosol to nucleus in cultured neurons in response to Abeta. Most importantly, the nuclear redistribution of FoxO3a is significantly increased in Abeta-overexpressing AbetaPPswe-PS1dE9 mice and Abeta-infused rat brains. We further find that FoxO3a is essential for loss of neurons and neural networks in response to Abeta. Recent reports implicate Bim, a pro-apoptotic member of Bcl-2 family, in neuron death in AD, as a key target of this transcription factor. We show that Bim is a direct target of FoxO3a in Abeta-treated neurons. Our findings thus indicate that FoxO3a is activated, translocated to the nucleus and mediates neuron death via Bim in response to Abeta toxicity.

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CRRD Object Information
CRRD ID: 10402187
Created: 2015-10-19
Species: All species
Last Modified: 2015-10-19
Status: ACTIVE



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