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Apoptosis induced by beta-amyloid25-35 in acetylcholinesterase-overexpressing neuroblastoma cells

Hai-Yan Zhang1, Stephen Brimijoin, Xi-Can Tang

  • 1State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, China.

Acta Pharmacologica Sinica
|September 6, 2003
PubMed
Abstract

Insights

Beta-amyloid fragment 25-35 (Aβ25-35) induces apoptosis in SC42 cells and elevates acetylcholinesterase (AChE) activity. However, AChE

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alzheimer's disease is characterized by beta-amyloid (Aβ) peptide accumulation.
  • Aβ fragments, such as Aβ25-35, are known to induce neuronal apoptosis.
  • Acetylcholinesterase (AChE) activity is implicated in various neurological processes.

Purpose of the Study:

  • To investigate the relationship between Aβ25-35-induced apoptosis and AChE activity.
  • To examine the role of AChE activity in Aβ25-35-mediated apoptosis in SC42 cells.

Main Methods:

  • Cell viability assessed using microscopy and MTT assay.
  • DNA fragmentation analyzed via electrophoresis.
  • AChE activity quantified using spectrophotometry.
  • Inhibition of AChE activity using huperzine A.

Main Results:

  • Aβ25-35 exposure significantly reduced SC42 cell viability and induced DNA fragmentation.
  • AChE activity increased by 1.7-fold after 48 hours of Aβ25-35 exposure.
  • Inhibiting AChE activity with huperzine A did not alter Aβ25-35 cytotoxicity.

Conclusions:

  • Aβ25-35 induces apoptosis and elevates AChE activity in SC42 cells.
  • The hydrolytic capacity of AChE is not a contributing factor to Aβ25-35-induced apoptosis.
  • This study elucidates a dissociation between Aβ-induced apoptosis and AChE activity modulation.

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