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FoxO3a is activated and executes neuron death via Bim in response to β-amyloid.
Cell Death Dis 2013; 4:e625CD

Abstract

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 β-amyloid (Aβ), in vitro and in vivo. We also find that oligomeric Aβ 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 Aβ. Most importantly, the nuclear redistribution of FoxO3a is significantly increased in Aβ-overexpressing AβPPswe-PS1dE9 mice and Aβ-infused rat brains. We further find that FoxO3a is essential for loss of neurons and neural networks in response to Aβ. 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 Aβ-treated neurons. Our findings thus indicate that FoxO3a is activated, translocated to the nucleus and mediates neuron death via Bim in response to Aβ toxicity.

Authors+Show Affiliations

Cell Biology and Physiology Division, CSIR-Indian Institute of Chemical Biology, Kolkata, India.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23661003

Citation

Sanphui, P, and S C. Biswas. "FoxO3a Is Activated and Executes Neuron Death Via Bim in Response to Β-amyloid." Cell Death & Disease, vol. 4, 2013, pp. e625.
Sanphui P, Biswas SC. FoxO3a is activated and executes neuron death via Bim in response to β-amyloid. Cell Death Dis. 2013;4:e625.
Sanphui, P., & Biswas, S. C. (2013). FoxO3a is activated and executes neuron death via Bim in response to β-amyloid. Cell Death & Disease, 4, pp. e625. doi:10.1038/cddis.2013.148.
Sanphui P, Biswas SC. FoxO3a Is Activated and Executes Neuron Death Via Bim in Response to Β-amyloid. Cell Death Dis. 2013 May 9;4:e625. PubMed PMID: 23661003.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - FoxO3a is activated and executes neuron death via Bim in response to β-amyloid. AU - Sanphui,P, AU - Biswas,S C, Y1 - 2013/05/09/ PY - 2013/5/11/entrez PY - 2013/5/11/pubmed PY - 2013/10/24/medline SP - e625 EP - e625 JF - Cell death & disease JO - Cell Death Dis VL - 4 N2 - 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 β-amyloid (Aβ), in vitro and in vivo. We also find that oligomeric Aβ 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 Aβ. Most importantly, the nuclear redistribution of FoxO3a is significantly increased in Aβ-overexpressing AβPPswe-PS1dE9 mice and Aβ-infused rat brains. We further find that FoxO3a is essential for loss of neurons and neural networks in response to Aβ. 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 Aβ-treated neurons. Our findings thus indicate that FoxO3a is activated, translocated to the nucleus and mediates neuron death via Bim in response to Aβ toxicity. SN - 2041-4889 UR - https://www.unboundmedicine.com/medline/citation/23661003/FoxO3a_is_activated_and_executes_neuron_death_via_Bim_in_response_to_β_amyloid_ L2 - http://dx.doi.org/10.1038/cddis.2013.148 DB - PRIME DP - Unbound Medicine ER -