The small molecule ISRIB reverses the effects of eIF2α phosphorylation on translation and stress granule assembly.

Abstract:

:Previously, we identified ISRIB as a potent inhibitor of the integrated stress response (ISR) and showed that ISRIB makes cells resistant to the effects of eIF2α phosphorylation and enhances long-term memory in rodents (Sidrauski et al., 2013). Here, we show by genome-wide in vivo ribosome profiling that translation of a restricted subset of mRNAs is induced upon ISR activation. ISRIB substantially reversed the translational effects elicited by phosphorylation of eIF2α and induced no major changes in translation or mRNA levels in unstressed cells. eIF2α phosphorylation-induced stress granule (SG) formation was blocked by ISRIB. Strikingly, ISRIB addition to stressed cells with pre-formed SGs induced their rapid disassembly, liberating mRNAs into the actively translating pool. Restoration of mRNA translation and modulation of SG dynamics may be an effective treatment of neurodegenerative diseases characterized by eIF2α phosphorylation, SG formation, and cognitive loss.

journal_name

Elife

journal_title

eLife

authors

Sidrauski C,McGeachy AM,Ingolia NT,Walter P

doi

10.7554/eLife.05033

subject

Has Abstract

pub_date

2015-02-26 00:00:00

issn

2050-084X

journal_volume

4

pub_type

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