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Structural aspects and physiological consequences of APP/APLP trans-dimerization.

Frederik Baumkötter1, Katja Wagner, Simone Eggert

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Summary

Alzheimer's disease involves amyloid precursor protein (APP) dysfunction. This review explores APP's role in cell adhesion and synapse formation, suggesting impaired function may contribute to synapse loss in Alzheimer's disease.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Amyloid precursor protein (APP) is central to Alzheimer's disease (AD), serving as the precursor for amyloid β (Aβ) peptides found in plaques.
  • Aβ oligomers exhibit pathogenic features, and APP processing is a key area of AD research.
  • Emerging evidence suggests APP and its homologs (APLP1, APLP2) play physiological roles in synaptogenesis via trans-cellular dimerization.

Purpose of the Study:

  • To critically review the structural characteristics of APP's trans-cellular interactions.
  • To contextualize these interactions within APP's putative physiological functions, particularly cell adhesion and synaptogenesis.
  • To explore the hypothesis that impaired APP/APLP cell adhesion contributes to synaptic loss in Alzheimer's disease.

Main Methods:

  • Review of existing cell biological and structural studies on APP and its homologs.
  • Analysis of structural data concerning APP trans-cellular interactions.
  • Integration of structural findings with proposed physiological roles in cell adhesion and synaptogenesis.

Main Results:

  • Accumulating evidence supports a role for APP and APLPs in mediating trans-cellular dimerization.
  • This dimerization is implicated in the physiological process of synaptogenesis.
  • Structural insights into APP interactions provide a basis for understanding its cell adhesion properties.

Conclusions:

  • APP and its homologs possess cell adhesion properties crucial for synaptogenesis under physiological conditions.
  • Dysfunction in these APP/APLP cell adhesion mechanisms may represent a contributing factor to synaptic loss observed in Alzheimer's disease.
  • Further investigation into APP's structural interactions is warranted to fully elucidate its role in AD pathogenesis and synaptic integrity.