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10.7554/eLife.05033.010 Figure 3. ISRIB addition rapidly dissolves pre-formed stress granules in live cells restoring translation.
Moreover, live cell imaging revealed that ISRIB addition can trigger a remarkably fast dissolution of phospho-eIF2α-dependent SGs in stressed cells, restoring translation.
Given the known neuroprotective effects of restoring protein synthesis rates in prion-diseased mice downstream of misfolded PrP accumulation [ 11, 23], we first asked if restoring translation through PERK inhibition in tau transgene-expressing mice was similarly neuroprotective.
Within a few minutes after administration, ISRIB reverses the effects triggered by eIF2α phosphorylation dissolving RNA stress granules and restoring translation of inhibited mRNAs while reversing de-repression of uORF-containing mRNAs (Sidrauski et al., 2015).
Restoring translation through normalizing eIF4E phosphorylation primarily affected Mmps (Mmp9, Mmp2, Mmp3, Mmp7, and Mmp24) and Dlg4 (PSD-95), but not other FMRP targets such as Camk2a (CamKIIa), Shanks, or Map1B.
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Notably, expression of E3 protein partially restored translation of ΔDLP virus mRNA that was strongly inhibited due to eIF2 phosphorylation in non induced cells.
Addition of wild-type eIF4AI does not rescue the inhibition by hippuristanol, whereas eIF4AIIG/T restored translation to ∼60% of normal levels (Fig. 4B, compare lanes 6 and 4 to 5 and 3, respectively).
Once the stress is resolved, PPP1R15A/GADD34 is induced to restore translation by dephosphorylating eIF2α (3).
GADD34 induction leads to a reduction of eIF2α-P, allowing cells to restore translation (Novoa et al., 2001).
This is in contrast to GSK2606414, which restores translation rates to ~100% in vivo and 90% in vitro.
The MEK inhibitor U0126 prevented the decrease in TFAM protein levels in MPP+-treated cells, and restored translation of the mtDNA-encoded proteins.
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