Spatial patterns of FUS-immunoreactive neuronal cytoplasmic inclusions (NCI) in neuronal intermediate filament inclusion disease (NIFID)

Richard A. Armstrong*, Marla Gearing, Eileen H. Bigio, Felix F. Cruz-Sanchez, Charles Duyckaerts, Ian R.A. MacKenzie, Robert H. Perry, Kari Skullerud, Hideaki Yokoo, Nigel J. Cairns

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Neuronal intermediate filament inclusion disease (NIFID), a rare form of frontotemporal lobar degeneration (FTLD), is characterized neuropathologically by focal atrophy of the frontal and temporal lobes, neuronal loss, gliosis, and neuronal cytoplasmic inclusions (NCI) containing epitopes of ubiquitin and neuronal intermediate filament (IF) proteins. Recently, the 'fused in sarcoma' (FUS) protein (encoded by the FUS gene) has been shown to be a component of the inclusions of NIFID. To further characterize FUS proteinopathy in NIFID, we studied the spatial patterns of the FUS-immunoreactive NCI in frontal and temporal cortex of 10 cases. In the cerebral cortex, sectors CA1/2 of the hippocampus, and the dentate gyrus (DG), the FUS-immunoreactive NCI were frequently clustered and the clusters were regularly distributed parallel to the tissue boundary. In a proportion of cortical gyri, cluster size of the NCI approximated to those of the columns of cells was associated with the cortico-cortical projections. There were no significant differences in the frequency of different types of spatial patterns with disease duration or disease stage. Clusters of NCI in the upper and lower cortex were significantly larger using FUS compared with phosphorylated, neurofilament heavy polypeptide (NEFH) or a-internexin (INA) immunohistochemistry (IHC). We concluded: (1) FUS-immunoreactive NCI exhibit similar spatial patterns to analogous inclusions in the tauopathies and synucleinopathies, (2) clusters of FUSimmunoreactive NCI are larger than those revealed byNEFH or IMA, and (3) the spatial patterns f the FUSimmunoreactive NCI suggest the degeneration of the cortico- cortical projections in NIFID.

Original languageEnglish (US)
Pages (from-to)1651-1657
Number of pages7
JournalJournal of Neural Transmission
Volume118
Issue number11
DOIs
StatePublished - Nov 2011

Keywords

  • 'Fused in sarcoma' (FUS)
  • Corticocortical projections
  • Neurofilament intermediate filament inclusion disease (NIFID)
  • Neuronal cytoplasmic inclusions (NCI)
  • Spatial pattern

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry

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