Intraneuronal immunoreactivity for the prion protein distinguishes a subset of E200K genetic from sporadic Creutzfeldt-Jakob disease

Gabor G. Kovacs, Kinga Molnár, Eva Keller, Gergo Botond, Herbert Budka, Lajos László

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Recently, we reported widespread intraneuronal prion protein (PrP) immunoreactivity in genetic Creutzfeldt-Jakob disease (CJD) associated with the E200K mutation. Here, we evaluated 6 cases ofsporadic CJD MM type 1, 5 MV type 2, and 7 VV type 2 and compared their anatomical appearance with that of 29 E200K genetic CJD (gCJD) cases. We also performed double immunolabeling for ubiquitin, p62, early endosomal marker rab5, and immunogold electronmicroscopy in 3 cases. We identified 4 morphological types of intraneuronal PrP immunoreactivity: one type, defined as multiple globular structures, was significantly associated with a subset of E200K gCJD cases and was distinct from the intraneuronal small dotlike PrP immunoreactivity seen in sporadic CJD. Whereas the latter colocalized with rab5, there were single large (7.5 μm-15 μm) globular inclusion body-like structures detected predominantly but not exclusively in E200K gCJD; these were immunoreactive in part for ubiquitin and p62 and showed focal γ-tubulin immunoreactivity, suggesting aggresome features. Ultrastructural examination using immunogold revealed PrP localization in aggresome-like structures and in autophagic vacuoles. These findings suggest that the permanent production of mutant PrP in the E200K gCJD cases overwhelms the ubiquitin-proteasome system and shifts the balance toward selectivemacroautophagy and/or to ubiquitinated inclusion body and aggresome formation as a cytoprotective effort to sequester the mutant protein.

Original languageEnglish
Pages (from-to)223-232
Number of pages10
JournalJournal of Neuropathology and Experimental Neurology
Volume71
Issue number3
DOIs
Publication statusPublished - Mar 1 2012

Keywords

  • Aggresome
  • Autophagy
  • Creutzfeldt-Jakob disease
  • Endosome-lysosome
  • Prion protein
  • Ubiquitin-proteosome
  • p62

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Neurology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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