Autophagy induction enhances TDP43 turnover and survival in neuronal ALS models

Sami J. Barmada, Andrea Serio, Arpana Arjun, Bilada Bilican, Aaron Daub, D. Michael Ando, Andrey Tsvetkov, Michael Pleiss, Xingli Li, Daniel Peisach, Christopher Shaw, Siddharthan Chandran, Steven Finkbeiner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

328 Citations (Scopus)

Abstract

Amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) have distinct clinical features but a common pathology-cytoplasmic inclusions rich in transactive response element DNA-binding protein of 43 kDa (TDP43). Rare TDP43 mutations cause ALS or FTD, but abnormal TDP43 levels and localization may cause disease even if TDP43 lacks a mutation. Here we show that individual neurons vary in their ability to clear TDP43 and are exquisitely sensitive to TDP43 levels. To measure TDP43 clearance, we developed and validated a single-cell optical method that overcomes the confounding effects of aggregation and toxicity and discovered that pathogenic mutations shorten TDP43 half-life. New compounds that stimulate autophagy improved TDP43 clearance and localization and enhanced survival in primary murine neurons and in human stem cell-derived neurons and astrocytes harboring mutant TDP43. These findings indicate that the levels and localization of TDP43 critically determine neurotoxicity and show that autophagy induction mitigates neurodegeneration by acting directly on TDP43 clearance.

Original languageEnglish
Pages (from-to)677-685
Number of pages11
JournalNature Chemical Biology
Volume10
Issue number8
Early online date29 Jun 2014
DOIs
Publication statusPublished - Aug 2014

Keywords

  • AMYOTROPHIC-LATERAL-SCLEROSIS
  • INCLUSION-BODY FORMATION
  • SPINAL MOTOR-NEURONS
  • TDP-43 PROTEINOPATHIES
  • MOUSE MODEL
  • FRONTOTEMPORAL DEMENTIA
  • HUNTINGTONS-DISEASE
  • MUTANT HUNTINGTIN
  • CELL MODEL
  • DEATH

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