Riluzole does not ameliorate disease caused by cytoplasmic TDP-43 in a mouse model of amyotrophic lateral sclerosis

Amanda L. Wright, Paul A. Della Gatta, Sheng Le, Britt A. Berning, Prachi Mehta, Kelly R. Jacobs, Hossai Gul, Rebecca San Gil, Thomas J. Hedl, Winonah R. Riddell, Owen Watson, Sean S. Keating, Juliana Venturato, Roger S. Chung, Julie D. Atkin, Albert Lee, Bingyang Shi, Catherine A. Blizzard, Marco Morsch, Adam K. Walker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease commonly treated with riluzole, a small molecule that may act via modulation of glutamatergic neurotransmission. However, riluzole only modestly extends lifespan for people living with ALS and its precise mechanisms of action remain unclear. Most ALS cases are characterised by accumulation of cytoplasmic TAR DNA binding protein of 43 kDa (TDP-43), and understanding the effects of riluzole in models that closely recapitulate TDP-43 pathology may provide insights for development of improved therapeutics. We therefore investigated the effects of riluzole in female transgenic mice that inducibly express nuclear localisation sequence (NLS)-deficient human TDP-43 in neurons (NEFH-tTA/tetO-hTDP-43ΔNLS, 'rNLS', mice). Riluzole treatment from the first day of hTDP-43ΔNLS expression did not alter disease onset, weight loss or performance on multiple motor behavioural tasks. Riluzole treatment also did not alter TDP-43 protein levels, solubility or phosphorylation. Although we identified a significant decrease in GluA2 and GluA3 proteins in the cortex of rNLS mice, riluzole did not ameliorate this disease-associated molecular phenotype. Likewise, riluzole did not alter the disease-associated atrophy of hindlimb muscle in rNLS mice. Finally, riluzole treatment beginning after disease onset in rNLS mice similarly had no effect on progression of late-stage disease or animal survival. Together, we demonstrate specific glutamatergic receptor alterations and muscle fibre-type changes reminiscent of ALS in female rNLS mice, but riluzole had no effect on these or any other disease phenotypes. Future targeting of pathways related to accumulation of TDP-43 pathology may be needed to develop better treatments for ALS.

Original languageEnglish
Pages (from-to)6237-6255
Number of pages19
JournalEuropean Journal of Neuroscience
Volume54
Issue number6
Early online date13 Aug 2021
DOIs
Publication statusPublished - Sep 2021

Keywords

  • motor neuron disease
  • neurodegeneration
  • pre-clinical study
  • muscle atrophy
  • AMPA receptors

Fingerprint

Dive into the research topics of 'Riluzole does not ameliorate disease caused by cytoplasmic TDP-43 in a mouse model of amyotrophic lateral sclerosis'. Together they form a unique fingerprint.

Cite this