α-Internexin aggregates are abundant in neuronal intermediate filament inclusion disease (NIFID) but rare in other neurodegenerative diseases

Nigel J. Cairns*, Kunihiro Uryu, Eileen H. Bigio, Ian R.A. Mackenzie, Marla Gearing, Charles Duyckaerts, Hideaki Yokoo, Yoichi Nakazato, Evelyn Jaros, Robert H. Perry, Steven E. Arnold, Virginia M.Y. Lee, John Q. Trojanowski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Abnormal neuronal aggregates of α-internexin and the three neurofilament (NF) subunits, NF-L, NF-M, and NF-H have recently been identified as the pathological hallmarks of neuronal intermediate filament (IF) inclusion disease (NIFID), a novel neurological disease of early onset with a variable clinical phenotype including frontotemporal dementia, pyramidal and extrapyramidal signs. α-Internexin, a class IV IF protein, a major component of inclusions in NIFID, has not previously been identified as a component of the pathological protein aggregates of any other neurodegenerative disease. Therefore, ta determine the specificity of this protein, α-internexin immunohistochemistry was undertaken on cases of NIFID, non-tau frontotemporal dementias, motor neuron disease, α -synucleinopathies, tauopathies, and normal aged control brains. Our results indicate that class IV IF proteins are present within the pleomorphic inclusions of all cases of NIFID. Small subsets of abnormal neuronal inclusions in Alzheimer's disease, Lewy body diseases, and motor neuron disease also contain epitopes of α-internexin. Thus, α-internexin is a major component of the neuronal inclusions in NIFID and a relatively minor component of inclusions in other neurodegenerative diseases. The discovery of α-internexin in neuronal cytoplasmic inclusions implicates novel mechanisms of pathogenesis in NIFID and other neurological diseases with pathological filamentous neuronal inclusions.

Original languageEnglish (US)
Pages (from-to)213-223
Number of pages11
JournalActa Neuropathologica
Volume108
Issue number3
StatePublished - Sep 1 2004

Keywords

  • Frontotemporal dementia
  • Intermediate filament
  • Neurofilament
  • Neuronal intermediate filament inclusion disease
  • α-internexin

ASJC Scopus subject areas

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

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