Wild type human TDP-43 potentiates ALS-linked mutant TDP-43 driven progressive motor and cortical neuron degeneration with pathological features of ALS

Acta Neuropathol Commun. 2015 Jun 25;3:36. doi: 10.1186/s40478-015-0212-4.

Abstract

Introduction: Amyotrophic lateral sclerosis (ALS) is a relentlessly progressive neurodegenerative disorder, and cytoplasmic inclusions containing transactive response (TAR) DNA binding protein (TDP-43) are present in ~90 % of cases. Here we report detailed pathology in human TDP-43 transgenic mice that recapitulate key features of TDP-43-linked ALS.

Results: Expression of human wild-type TDP-43 (TDP-43(WT)) caused no clinical or pathological phenotype, while expression of Q331K mutant (TDP-43(Q331K)) resulted in a non-lethal age-dependent motor phenotype, accompanied by cytoplasmic TDP-43 aggregation, mild neuronal loss, with astroglial and microglial activation in the motor cortex and spinal cord at 24 months. However, co-expression of WT and Q331K mutant (TDP-43(WTxQ331K)) resulted in an extremely aggressive motor phenotype with tremor from 3 weeks and progressive hind-limb paralysis necessitating euthanasia by 8-10 weeks of age. Neuronal loss and reactive gliosis was observed in the spinal cord and layer V region of the cortex, with TDP-43, ubiquitin and p62 cytoplasmic inclusions and an increase in insoluble TDP-43. Nuclear clearance of TDP-43 was not observed in TDP-43(Q331K) mice but was seen in 65 % of aggregate containing spinal cord motor neurons in TDP-43(WTxQ331K) mice.

Conclusions: We hypothesise that cytoplasmic TDP-43(Q331K) aggregates facilitate the recruitment of WT protein in compound animals, which dramatically accelerates neurodegeneration and disease progression. The exploration of disease mechanisms in slow and rapid disease models of TDP-43 proteinopathy will help elucidate novel drug targets and provide a more informative platform for preclinical trials.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Amyotrophic Lateral Sclerosis / genetics*
  • Amyotrophic Lateral Sclerosis / pathology*
  • Amyotrophic Lateral Sclerosis / physiopathology
  • Animals
  • Antigens, CD / metabolism
  • Cerebral Cortex / pathology*
  • Cytoplasm / metabolism
  • Cytoplasm / pathology
  • DNA-Binding Proteins / genetics*
  • DNA-Binding Proteins / metabolism
  • Disease Models, Animal
  • Disease Progression
  • Gene Expression Regulation / genetics
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Mutation / genetics*
  • Nerve Tissue Proteins / metabolism
  • Neurons / metabolism
  • Neurons / pathology*
  • Spinal Cord / pathology

Substances

  • Antigens, CD
  • DNA-Binding Proteins
  • Nerve Tissue Proteins
  • TDP-43 protein, human