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SUMO-1 marks the nuclear inclusions in familial neuronal intranuclear inclusion disease.

Abstract
Neuronal intranuclear inclusion disease (NIID) is a rare neurodegenerative disorder characterized by progressive ataxia and neuronal nuclear inclusions (NIs), similar to the inclusions found in expanded CAG repeat diseases. NIID may be familial or sporadic. The cause of familial NIID is poorly understood, as no CAG expansion has been detected. We examined three cases, from two unrelated families, who had autosomal dominant NIID but normal CAG repeats in genes involved in polyglutamine neurodegenerative diseases. We found that NIs in all three cases were intensely immunopositive for SUMO-1, a protein which covalently conjugates to other proteins and targets them to the nuclear regions (nuclear bodies) responsible for nuclear proteasomal degradation. Electron microscopy demonstrated that SUMO-1 was located on the 10-nm fibrils of NIs. In cultured PC12 cells, we found that inhibition of proteasome function by specific inhibitors resulted in the appearance of SUMO-1-immunopositive nuclear inclusions. Our study suggests that recruitment of SUMO-1 modified proteins into insoluble nuclear inclusions and proteasomal dysfunction may be involved in the pathogenesis of NIs in familial NIID cases.
AuthorsD L Pountney, Y Huang, R J Burns, E Haan, P D Thompson, P C Blumbergs, W P Gai
JournalExperimental neurology (Exp Neurol) Vol. 184 Issue 1 Pg. 436-46 (Nov 2003) ISSN: 0014-4886 [Print] United States
PMID14637113 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Biomarkers
  • Multienzyme Complexes
  • SUMO-1 Protein
  • Cysteine Endopeptidases
  • Proteasome Endopeptidase Complex
Topics
  • Adult
  • Aged
  • Animals
  • Biomarkers
  • Blotting, Western
  • Brain (pathology)
  • Cell Nucleus (metabolism, pathology)
  • Cysteine Endopeptidases (metabolism)
  • Electrophoresis, Polyacrylamide Gel
  • Female
  • Humans
  • Immunohistochemistry
  • Inclusion Bodies (metabolism, pathology)
  • Microscopy, Electron
  • Middle Aged
  • Multienzyme Complexes (metabolism)
  • Neurodegenerative Diseases (genetics, metabolism, pathology)
  • PC12 Cells
  • Pedigree
  • Proteasome Endopeptidase Complex
  • Rats
  • SUMO-1 Protein (genetics, metabolism)

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