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Directional Modulation of the Integrated Stress Response in Neurodegeneration: A Systematic Review of eIF2B

Isabella Ionela Stoian1,2, Daciana Nistor3,4, Mihaela Codrina Levai1,5,6

  • 1Doctoral School, Victor Babes University of Medicine and Pharmacy, 300041 Timisoara, Romania.

Biomedicines
|January 28, 2026
PubMed

Insights

Synthetic modulators of the integrated stress response (ISR) show promise for neurodegenerative diseases. Targeting the ISR pathway offers consistent benefits, but mechanism and safety must be carefully managed for effective translation.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Genetics

Background:

  • The integrated stress response (ISR) is a key pathway implicated in neurodegenerative diseases.
  • Synthetic modulators offer potential therapeutic strategies for these conditions.
  • Understanding their efficacy, biomarker engagement, and safety is crucial for clinical translation.

Purpose of the Study:

  • To systematically map and compare the in vivo evidence for synthetic ISR modulators in mammalian neurodegeneration models.
  • To assess efficacy signals, biomarker engagement (e.g., ATF4, p-eIF2α), and safety profiles across different ISR modulation mechanisms and disease classes.

Main Methods:

  • A systematic literature search was conducted following PRISMA 2020 guidelines across PubMed, Embase, and Scopus.
  • Inclusion criteria comprised mammalian neurodegeneration models, synthetic ISR modulators (eIF2B activators, PERK inhibitors/activators, GADD34-PP1 prolongers), and prespecified outcomes.
  • Data extracted included model details, dosage, route, outcomes, translational biomarkers, and safety information.

Main Results:

  • Twelve studies met the criteria, covering Alzheimer's disease, prion disease, ALS, Huntington's disease, neuropathies, demyelination, and aging.
  • Ten of eleven interpretable studies reported benefits in at least one domain.
  • Different modulator classes showed varied efficacy: eIF2B activation (ISRIB) was positive in 3/4 studies, PERK inhibition in all 3, ISR prolongation in both, and PERK activation in both.
  • Safety profiles were mechanism-dependent, with PERK inhibition showing toxicities, while ISRIB and ISR-prolonging agents were generally well-tolerated.

Conclusions:

  • Directional control of the ISR pathway leads to consistent, context-dependent improvements in behavior, structure, or survival, supported by biomarker evidence.
  • Matching the ISR modulation mechanism (down-tuning vs. prolonging) to the specific disease context is essential.
  • Exposure-driven safety management is critical for the successful translation of ISR modulators into clinical therapies.
Keywords:
drug effectsdrug therapyendoplasmic reticulumeukaryotic metabolismneurodegenerative diseasesprotein kinaseprotein response physiology

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