Neurotoxic APP C-terminal and beta-amyloid domains colocalize in the nuclei of substantia nigra pars reticulata neurons undergoing delayed degeneration. Academic Article uri icon

Overview

abstract

  • Increased amyloid precursor protein (APP) expression and intracellular accumulation of its toxic fragments have been associated with acute neuronal death processes. However, the role of APP fragments in delayed neurodegeneration remains poorly understood. We have characterized the appearance of APP domains in rat substantia nigra pars reticulata (SNpR) neurons targeted for delayed degeneration following neurotoxic striatal lesion. From 4 to 8 days postlesion (dpl) SNpR neurons ipsilateral to the lesion showed marked cytosolic accumulation of full length APP. Moreover, the nuclei of affected neurons also showed intense immunoreactivity (IR) for APP C-terminal and beta-amyloid domains but not for an N-terminal sequence. These data suggested the presence of APP C-terminal fragment. The absence of nuclear IR for a beta1-40 specific antibody supports this conclusion. Ultrastructural analysis of nigral sections from 6 dpl rats using a beta-amyloid domain antibody showed pronounced accumulation of immunogold-silver reaction product in the nuclei of affected SNpR neurons that was absent in control, contralateral SNpR neurons. These findings suggest that intranuclear APP C-terminal fragment may play a role in genomic events contributing to delayed neuron degeneration in the SNpR.

publication date

  • August 25, 2000

Research

keywords

  • Amyloid beta-Peptides
  • Amyloid beta-Protein Precursor
  • Cell Nucleus
  • Nerve Degeneration
  • Neurotoxins
  • Substantia Nigra

Identity

Scopus Document Identifier

  • 0034714402

PubMed ID

  • 10960598

Additional Document Info

volume

  • 874

issue

  • 2