Endogenous TDP-43, but not FUS, contributes to stress granule assembly via G3BP

Molecular Neurodegeneration

Christine Vande Velde²  Stéphanie Stabile¹  Anaïs Aulas¹ 

[1] Centre d’excellence en neuromique de l’Université de Montréal, Centre de recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), Departments of Medicine and Biochemistry, Université de Montréal, 1560 rue Sherbrooke Est, Montréal, QC, H2L 4M1, Canada;CHUM Research Center (CRCHUM), Université de Montréal, 1560 rue Sherbrooke Est, Montréal, H2L 4M1, Canada

关键词: Oxidative stress;    Cell death;    ALS;    TIA-1;    G3BP;    FUS/TLS;    Stress granules;    TDP-43;   

Others  :  865420
DOI  :  10.1186/1750-1326-7-54

 received in 2012-05-25, accepted in 2012-10-19,  发布年份 2012

【 摘 要 】

Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by the selective loss of upper and lower motor neurons, a cell type that is intrinsically more vulnerable than other cell types to exogenous stress. The interplay between genetic susceptibility and environmental exposures to toxins has long been thought to be relevant to ALS. One cellular mechanism to overcome stress is the formation of small dense cytoplasmic domains called stress granules (SG) which contain translationally arrested mRNAs. TDP-43 (encoded by TARDBP) is an ALS-causative gene that we have previously implicated in the regulation of the core stress granule proteins G3BP and TIA-1. TIA-1 and G3BP localize to SG under nearly all stress conditions and are considered essential to SG formation. Here, we report that TDP-43 is required for proper SG dynamics, especially SG assembly as marked by the secondary aggregation of TIA-1. We also show that SG assembly, but not initiation, requires G3BP. Furthermore, G3BP can rescue defective SG assembly in cells depleted of endogenous TDP-43. We also demonstrate that endogenous TDP-43 and FUS do not have overlapping functions in this cellular process as SG initiation and assembly occur normally in the absence of FUS. Lastly, we observe that SG assembly is a contributing factor in the survival of neuronal-like cells responding to acute oxidative stress. These data raise the possibility that disruptions of normal stress granule dynamics by loss of nuclear TDP-43 function may contribute to neuronal vulnerability in ALS.

【 授权许可】

   
2012 Aulas et al.; licensee BioMed Central Ltd.

【 图 表 】

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