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Amyloid precursor protein proteoglycan is increased after brain damage

O Salinero1, J J Garrido, F Wandosell

  • 1Centro de Biología Molecular 'Severo Ochoa', CSIC-Universidad Autonoma de Madrid, Cantoblanco-Madrid 28049, Spain.

Biochimica Et Biophysica Acta
|June 19, 1998
PubMed
Summary

Alzheimer's disease research reveals amyloid precursor proteins (APP) exist as chondroitin-sulfate proteoglycans in the brain. This novel form may play a key role in amyloid plaque formation and aggregation.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • Alzheimer's disease is characterized by beta-amyloid peptide (Abeta) deposition in the brain.
  • Amyloid precursor protein (APP) processing pathways are known to produce Abeta, but post-translational modifications remain unclear.
  • Understanding APP metabolism is crucial for Alzheimer's disease research.

Purpose of the Study:

  • To investigate novel post-translational modifications and processing pathways of APP in the brain.
  • To identify alternative forms of APP and their potential role in amyloidogenesis.

Main Methods:

  • Analysis of proteoglycan forms of APP in normal rat brain.
  • Characterization of chondroitin-sulfate proteoglycan (PG) APPs using biochemical techniques.

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Main Results:

  • Identified a complex pool of 8 to 130 kDa chondroitin-sulfate (ChS)-core proteins in rat brain.
  • The majority of these PG-APPs contain the complete amyloidogenic sequence.
  • This PG-APP population increases following brain damage.

Conclusions:

  • APP exists as chondroitin-sulfate proteoglycans, representing a novel processing pathway.
  • This pathway may contribute to the initial deposition and aggregation kinetics of amyloid in Alzheimer's disease.