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Dysregulation of the ALS-associated gene TDP-43 leads to neuronal death and degeneration in mice.

Amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD) are characterized by cytoplasmic protein aggregates in the brain and spinal cord that include TAR-DNA binding protein 43 (TDP-43). TDP-43 is normally localized in the nucleus with roles in the regulation of gene expression, and pathological cytoplasmic aggregates are associated with depletion of nuclear protein. Here, we generated transgenic mice expressing human TDP-43 with a defective nuclear localization signal in the forebrain (hTDP-43-ΔNLS), and compared them with mice expressing WT hTDP-43 (hTDP-43-WT) to determine the effects of mislocalized cytoplasmic TDP-43 on neuronal viability. Expression of either hTDP-43-ΔNLS or hTDP-43-WT led to neuron loss in selectively vulnerable forebrain regions, corticospinal tract degeneration, and motor spasticity recapitulating key aspects of FTLD and primary lateral sclerosis. Only rare cytoplasmic phosphorylated and ubiquitinated TDP-43 inclusions were seen in hTDP-43-ΔNLS mice, suggesting that cytoplasmic inclusions were not required to induce neuronal death. Instead, neurodegeneration in hTDP-43 and hTDP-43-ΔNLS-expressing neurons was accompanied by a dramatic downregulation of the endogenous mouse TDP-43. Moreover, mice expressing hTDP-43-ΔNLS exhibited profound changes in gene expression in cortical neurons. Our data suggest that perturbation of endogenous nuclear TDP-43 results in loss of normal TDP-43 function(s) and gene regulatory pathways, culminating in degeneration of selectively vulnerable affected neurons.

Pubmed ID: 21206091

Authors

  • Igaz LM
  • Kwong LK
  • Lee EB
  • Chen-Plotkin A
  • Swanson E
  • Unger T
  • Malunda J
  • Xu Y
  • Winton MJ
  • Trojanowski JQ
  • Lee VM

Journal

The Journal of clinical investigation

Publication Data

February 2, 2011

Associated Grants

  • Agency: NIA NIH HHS, Id: AG-17586
  • Agency: NIA NIH HHS, Id: AG-33101
  • Agency: NIA NIH HHS, Id: K08 AG033101
  • Agency: NIA NIH HHS, Id: T32-AG00255

Mesh Terms

  • Amyotrophic Lateral Sclerosis
  • Animals
  • Cell Survival
  • DNA-Binding Proteins
  • Frontotemporal Lobar Degeneration
  • Gene Expression Profiling
  • Gene Expression Regulation
  • Humans
  • Inclusion Bodies
  • Mice
  • Mice, Inbred C3H
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Microarray Analysis
  • Neurons
  • Principal Component Analysis