Detection of TDP-43 oligomers in frontotemporal lobar degeneration-TDP

Ann Neurol. 2015 Aug;78(2):211-21. doi: 10.1002/ana.24431. Epub 2015 Jun 30.


Objective: The proteinaceous inclusions in TDP-43 proteinopathies such as frontotemporal lobar degeneration (FTLD)-TDP are made of high-molecular-weight aggregates of TDP-43. These aggregates have not been classified as amyloids, as prior amyloid staining results were not conclusive. Here we used a specific TDP-43 amyloid oligomer antibody called TDP-O to determine the presence and abundance of TDP-43 oligomers among different subtypes of FTLD-TDP as well as in hippocampal sclerosis (HS), which represents a non-FTLD pathology with TDP-43 inclusions.

Methods: Postmortem tissue from the hippocampus and anterior orbital gyrus from 54 prospectively assessed and diagnosed subjects was used for immunostaining with TDP-O. Electron microscopy was used to assess the subcellular locations of TDP-O-decorated structures.

Results: TDP-43 inclusions staining with TDP-O were present in FTLD-TDP and were most conspicuous for FTLD-TDP type C, the subtype seen in most patients with semantic variant primary progressive aphasia. TDP-O immunoreactivity was absent in the hippocampus of HS patients despite abundant TDP-43 inclusions. Ultrastructurally, TDP-43 oligomers resided in granular or tubular structures, frequently in close proximity to, but not within, neuronal lysosomes.

Interpretation: TDP-43 forms amyloid oligomers in the human brain, which may cause neurotoxicity in a manner similar to other amyloid oligomers. Oligomer formation may contribute to the conformational heterogeneity of TDP-43 aggregates and mark the different properties of TDP-43 inclusions between FTLD-TDP and HS.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Amyloid / metabolism*
  • Amyotrophic Lateral Sclerosis / metabolism*
  • Biopolymers / metabolism
  • DNA-Binding Proteins / metabolism*
  • DNA-Binding Proteins / ultrastructure
  • Female
  • Frontotemporal Lobar Degeneration / metabolism*
  • Hippocampus / metabolism*
  • Hippocampus / pathology
  • Hippocampus / ultrastructure
  • Humans
  • Immunohistochemistry
  • Male
  • Microscopy, Electron
  • Middle Aged
  • Neurons / metabolism*
  • Neurons / ultrastructure
  • Prefrontal Cortex / metabolism*
  • Prefrontal Cortex / ultrastructure
  • Sclerosis


  • Amyloid
  • Biopolymers
  • DNA-Binding Proteins
  • TARDBP protein, human