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Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
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Cellular membrane fluidity in amyloid precursor protein processing

Xiaoguang Yang1, Grace Y Sun, Gunter P Eckert

  • 1Department of Clinical Neuroscience and Rehabilitation, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, 405 30, Gothenburg, Sweden.

Molecular Neurobiology
|February 21, 2014
PubMed

Insights

Cell membrane properties influence Alzheimer's disease (AD) pathology. Alterations in membrane fluidity, driven by factors like phospholipases A2 (PLA2s) and cholesterol, affect amyloid precursor protein (APP) processing and amyloid-beta (Aβ) production.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Senile plaques composed of amyloid-beta (Aβ) are hallmarks of Alzheimer's disease (AD).
  • Aβ is generated through the amyloidogenic pathway involving β- and γ-secretase cleavage of amyloid precursor protein (APP).
  • The nonamyloidogenic pathway, involving α-secretase, produces neuroprotective soluble APP (sAPPα).

Purpose of the Study:

  • To review the critical role of cellular membrane biophysical properties in regulating APP processing.
  • To explore how factors like phospholipases A2 (PLA2s), fatty acids, cholesterol, and Aβ impact membrane fluidity and APP metabolism.

Main Methods:

  • Literature review focusing on the interplay between membrane biophysics and APP processing.
  • Analysis of studies investigating the effects of specific lipids and enzymes on membrane properties and secretase activity.

Main Results:

  • Membrane composition and fluidity significantly influence the activity of secretases involved in APP processing.
  • Phospholipases A2 (PLA2s), fatty acids, and cholesterol modulate membrane fluidity, thereby affecting the balance between amyloidogenic and nonamyloidogenic pathways.
  • Aβ itself can alter membrane properties, potentially creating feedback loops that exacerbate pathology.

Conclusions:

  • Cellular membrane biophysical properties are crucial determinants of APP processing and Aβ generation in AD.
  • Targeting membrane properties may offer novel therapeutic strategies for Alzheimer's disease.
  • Understanding these membrane-centric mechanisms is vital for advancing AD research.

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