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|March 8, 2017
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Amyloid precursor protein (APP) is vital for presynaptic active zone function in the brain. Its absence disrupts calcium homeostasis and neurotransmitter release, mirroring Alzheimer's disease pathology.

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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.