APP-A Novel Player within the Presynaptic Active Zone Proteome

Area of Science:

• Neuroscience
• Molecular Biology
• Proteomics

Background:

• Alzheimer's disease (AD) is characterized by amyloid plaques and cognitive decline.
• The physiological role of amyloid precursor protein (APP) in the central nervous system (CNS) remains poorly understood.
• APP is the precursor to amyloid A4 peptide (Aβ), a key component of senile plaques in AD.

Purpose of the Study:

• To investigate the physiological role of APP within the central nervous system (CNS).
• To identify APP's function within the presynaptic active zone (PAZ) proteome.
• To analyze the impact of APP deletion on the hippocampal PAZ proteome network.

Main Methods:

• Proteomic analysis of the hippocampal PAZ from APP-mutant mice.
• Comparison of proteome changes in APP-deficient mice with AD pathogenesis.
• Assessment of APP's role in calcium homeostasis, neurotransmitter release, and mitochondrial function.

Main Results:

• APP is a integral component of the hippocampal PAZ proteome network.
• APP deletion causes significant dysregulation within the PAZ proteome.
• Key functions including Ca2+ homeostasis, neurotransmitter release, and mitochondrial function are affected by APP absence, mimicking AD.
• Observed protein abundance changes in APP-deficient and AD brains suggest APP's regulatory role.

Conclusions:

• APP is identified as a novel and crucial player in neuronal communication and signaling at the PAZ.
• APP acts as both a structural and functional regulator within the hippocampal PAZ proteome.
• Dysregulation of the PAZ proteome due to APP deletion has implications for understanding Alzheimer's disease pathogenesis.