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Review
. 2013 Sep;280(18):4348-70.
doi: 10.1111/febs.12287. Epub 2013 May 9.

Stress granules in neurodegeneration--lessons learnt from TAR DNA binding protein of 43 kDa and fused in sarcoma

Eva Bentmann  1 , Christian Haass, Dorothee Dormann
Affiliations
Free article
Review

Stress granules in neurodegeneration--lessons learnt from TAR DNA binding protein of 43 kDa and fused in sarcoma

Eva Bentmann et al. FEBS J. 2013 Sep.
Free article

Abstract

Stress granules (SGs) are cytoplasmic foci that rapidly form when cells are exposed to stress. They transiently store mRNAs encoding house-keeping proteins and allow the selective translation of stress-response proteins (e.g. heat shock proteins). Besides mRNA, SGs contain RNA-binding proteins, such as T cell internal antigen-1 and poly(A)-binding protein 1, which can serve as characteristic SG marker proteins. Recently, some of these SG marker proteins were found to label pathological TAR DNA binding protein of 43 kDa (TDP-43)- or fused in sarcoma (FUS)-positive cytoplasmic inclusions in patients with amyotrophic lateral sclerosis and frontotemporal lobar degeneration. In addition, protein aggregates in other neurodegenerative diseases (e.g. tau inclusions in Alzheimer's disease) show a co-localization with T cell internal antigen-1 as well. Moreover, several RNA-binding proteins that are commonly found in SGs have been genetically linked to neurodegeneration. This suggests that SGs might play an important role in the pathogenesis of these proteinopathies, either by acting as a seed for pathological inclusions, by mediating translational repression or by trapping essential RNA-binding proteins, or by a combination of these mechanisms. This minireview gives an overview of the general biology of SGs and highlights the recently identified connection of SGs with TDP-43, FUS and other proteins involved in neurodegenerative diseases. We propose that pathological inclusions containing RNA-binding proteins, such as TDP-43 and FUS, might arise from SGs and discuss how SGs might contribute to neurodegeneration via toxic gain or loss-of-function mechanisms.

Keywords: ALS; FTLD; FUS; RNA-binding proteins; TDP-43; TLS; neurodegeneration; stress granules.

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