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Alzheimer's A beta(1-42) is generated in the endoplasmic reticulum/intermediate compartment of NT2N cells

D G Cook1, M S Forman, J C Sung

  • 1Department of Pathology & Laboratory Medicine, University of Pennsylvania, Abramson Research Center, Philadelphia 19104, USA.

Nature Medicine
|September 1, 1997
PubMed

Insights

Researchers found that retaining amyloid precursor protein (APP) in the endoplasmic reticulum/intermediate compartment (ER/IC) stopped the production of amyloid beta (A beta)(1-40) but not A beta(1-42). This suggests the ER/IC is a key site for generating amyloidogenic A beta species in Alzheimer's disease.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is characterized by amyloid plaques, primarily composed of amyloid beta-peptide (A beta).
  • A beta, particularly the A beta(1-42) variant, is implicated in AD pathogenesis.
  • The precise subcellular location of A beta generation remains largely unknown.

Purpose of the Study:

  • To identify the specific subcellular organelles responsible for A beta generation.
  • To determine if A beta(1-40) and A beta(1-42) are produced at the same site within the cell.
  • To investigate the role of the endoplasmic reticulum/intermediate compartment (ER/IC) in A beta biosynthesis.

Main Methods:

  • Utilized human NT2N neurons for experimental studies.
  • Employed three independent methods to retain amyloid precursor protein (APP) within the ER/IC.
  • Monitored intracellular synthesis of A beta(1-40) and A beta(1-42) under conditions of ER/IC retention.

Main Results:

  • Retention of APP in the ER/IC effectively eliminated intracellular A beta(1-40) production.
  • Intracellular synthesis of A beta(1-42) was not affected by APP retention in the ER/IC.
  • These findings indicate differential localization of A beta species production.

Conclusions:

  • The endoplasmic reticulum/intermediate compartment (ER/IC) may serve as a critical site for the generation of the highly amyloidogenic A beta(1-42) species.
  • A beta(1-40) and A beta(1-42) are likely synthesized at different subcellular locations.
  • This research provides new insights into the early events of A beta production in Alzheimer's disease.

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