Acta Neuropathologica

, 122:591 | Cite as

Transportin1: a marker of FTLD-FUS

  • Jack Brelstaff
  • Tammaryn Lashley
  • Janice L. Holton
  • Andrew J. Lees
  • Martin N. Rossor
  • Rina Bandopadhyay
  • Tamas Revesz
Original Paper

Abstract

The term frontotemporal lobar degeneration (FTLD) describes a group of disorders that are subdivided by the presence of one of a number of pathological proteins identified in the inclusion bodies observed post-mortem. The FUS variant is defined by the presence of the fused in sarcoma protein (FUS) in the pathological inclusions. However, similar to other FTLDs, the disease pathogenesis of FTLD-FUS remains largely poorly understood. Here we present data that the protein transportin1 (TRN1) is abundant in the FUS-positive inclusions. TRN1, the protein product of the TNP01 gene, is responsible for shuttling proteins containing an M9 nuclear localisation signal between the nuclear and cytoplasmic compartments. RNA interacting proteins, including FUS, have been implicated as targets of TRN1. Using TRN1 immunohistochemistry and Western blotting in this study, we investigated 13 cases of FTLD-FUS including 6 cases with neuronal intermediate filament inclusion disease (NIFID) and 7 atypical frontotemporal lobar degeneration with ubiquitinated inclusion (aFTLD-U) cases. The data from our immunohistochemical studies show that FUS-immunoreactive inclusions are also strongly labelled with the anti-TRN1 antibody and double-label immunofluorescence studies indicate good co-localisation between the FUS and TRN1 pathologies. Our biochemical investigations demonstrate that urea-soluble TRN1 is present in aFTLD-U and NIFID, but not in normal control brains. These findings implicate abnormalities of FUS transport in the pathogenesis of FTLD-FUS.

Keywords

Fused in sarcoma FUS Transportin1 TRN1 TNP01 Biochemistry FTLD Frontotemporal dementia Frontotemporal lobar degeneration 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Jack Brelstaff
    • 1
  • Tammaryn Lashley
    • 1
  • Janice L. Holton
    • 1
    • 2
  • Andrew J. Lees
    • 1
    • 2
  • Martin N. Rossor
    • 3
  • Rina Bandopadhyay
    • 2
  • Tamas Revesz
    • 1
  1. 1.Queen Square Brain Bank for Neurological Disorders, Department of Molecular Neuroscience, UCL Institute of NeurologyUniversity College LondonLondonUK
  2. 2.Reta Lila Weston Institute, UCL Institute of NeurologyLondonUK
  3. 3.Dementia Research Centre, UCL Institute of NeurologyLondonUK

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