Neurogenin 2 mediates amyloid-β precursor protein-stimulated neurogenesis

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• The normal function of Amyloid-β precursor protein (APP) is unclear, despite its known association with Alzheimer disease.
• Previous research suggests APP influences neural stem/progenitor cell (NSPC) proliferation and neuronal differentiation.

Purpose of the Study:

• To investigate the specific role of APP in regulating NSPC differentiation.
• To identify molecular mediators of APP-induced neurogenesis.

Main Methods:

• Utilized a gene array approach to identify genes correlated with APP-induced neurogenesis.
• Examined NSPC differentiation in APP knockout (APPKO) and APP transgenic (Tg2576) mice.
• Assessed the impact of neurogenin 2 (Ngn2) manipulation (overexpression and knockdown) on NSPC differentiation.

Main Results:

• Neurogenin 2 (Ngn2) expression was significantly reduced in APPKO NSPCs and increased in Tg2576 NSPCs.
• Overexpressing Ngn2 in APPKO NSPCs enhanced neuronal differentiation.
• Knockdown of Ngn2 in wild-type NSPCs reduced neuronal differentiation.

Conclusions:

• Amyloid-β precursor protein (APP) stimulates neuronal differentiation of neural stem/progenitor cells (NSPCs).
• This APP-mediated effect is dependent on the transcription factor neurogenin 2 (Ngn2).