Mutant SOD1 inhibits ER-Golgi transport in amyotrophic lateral sclerosis

Julie D. Atkin*, Manal A. Farg, Kai Ying Soo, Adam K. Walker, Mark Halloran, Bradley J. Turner, Phillip Nagley, Malcolm K. Horne

*Corresponding author for this work

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Cu/Zn-superoxide dismutase is misfolded in familial and sporadic amyotrophic lateral sclerosis, but it is not clear how this triggers endoplasmic reticulum (ER) stress or other pathogenic processes. Here, we demonstrate that mutant SOD1 (mSOD1) is predominantly found in the cytoplasm in neuronal cells. Furthermore, we show that mSOD1 inhibits secretory protein transport from the ER to Golgi apparatus. ER-Golgi transport is linked to ER stress, Golgi fragmentation and axonal transport and we also show that inhibition of ER-Golgi trafficking preceded ER stress, Golgi fragmentation, protein aggregation and apoptosis in cells expressing mSOD1. Restoration of ER-Golgi transport by over-expression of coatomer coat protein II subunit Sar1 protected against inclusion formation and apoptosis, thus linking dysfunction in ER-Golgi transport to cellular pathology. These findings thus link several cellular events in amyotrophic lateral sclerosis into a single mechanism occurring early in mSOD1 expressing cells.

Original languageEnglish
Pages (from-to)190-204
Number of pages15
JournalJournal of Neurochemistry
Volume129
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

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