PABPN1 suppresses TDP-43 toxicity in ALS disease models

Ching Chieh Chou, Olga M. Alexeeva, Shizuka Yamada, Amy Pribadi, Yi Zhang, Bi Mo, Kathryn R. Williams, Daniela C. Zarnescu, Wilfried Rossoll

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

TAR DNA-binding protein 43 (TDP-43) is a major disease protein in amyotrophic lateral sclerosis (ALS) and related neurodegenerative diseases. Both the cytoplasmic accumulation of toxic ubiquitinated and hyperphosphorylated TDP-43 fragments and the loss of normal TDP-43 from the nucleus may contribute to the disease progression by impairing normal RNA and protein homeostasis. Therefore, both the removal of pathological protein and the rescue of TDP-43 mislocalization may be critical for halting or reversing TDP-43 proteinopathies. Here, we report poly(A)-binding protein nuclear 1 (PABPN1) as a novel TDP-43 interaction partner that acts as a potent suppressor of TDP-43 toxicity. Overexpression of full-length PABPN1 but not a truncated version lacking the nuclear localization signal protects from pathogenic TDP-43-mediated toxicity, promotes the degradation of pathological TDP-43 and restores normal solubility and nuclear localization of endogenous TDP-43. Reduced levels of PABPN1 enhances the phenotypes in several cell culture and Drosophila models of ALS and results in the cytoplasmic mislocalization of TDP-43. Moreover, PABPN1 rescues the dysregulated stress granule (SG) dynamics and facilitates the removal of persistent SGs in TDP-43-mediated disease conditions. These findings demonstrate a role for PABPN1 in rescuing several cytopathological features of TDP-43 proteinopathy by increasing the turnover of pathologic proteins.

Original languageEnglish (US)
Pages (from-to)5154-5173
Number of pages20
JournalHuman molecular genetics
Volume24
Issue number18
DOIs
StatePublished - Apr 9 2015

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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  • Cite this

    Chou, C. C., Alexeeva, O. M., Yamada, S., Pribadi, A., Zhang, Y., Mo, B., Williams, K. R., Zarnescu, D. C., & Rossoll, W. (2015). PABPN1 suppresses TDP-43 toxicity in ALS disease models. Human molecular genetics, 24(18), 5154-5173. https://doi.org/10.1093/hmg/ddv238