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Small molecule cognitive enhancer reverses age-related memory decline in mice
Karen Krukowski1,2, Amber Nolan2,3, Elma S Frias1,2
1Department of Physical Therapy and Rehabilitation Science, University of California at San Francisco, San Francisco, United States.
Elife
|December 1, 2020
Summary
A new drug, ISRIB, reverses age-related cognitive decline in mice by inhibiting the integrated stress response (ISR). This treatment improves memory and restores neuronal function, offering hope for healthy aging brains.
Area of Science:
- Neuroscience
- Aging Research
- Pharmacology
Background:
- Age-associated cognitive decline is a growing concern with increased life expectancy.
- The integrated stress response (ISR) is activated during aging and contributes to age-related brain changes.
- Current interventions for cognitive decline often focus on neurodegenerative diseases, leaving a gap for healthy aging individuals.
Purpose of the Study:
- To investigate the role of the integrated stress response (ISR) in age-related cognitive decline.
- To evaluate the efficacy of the small-molecule ISR inhibitor, ISRIB, in reversing cognitive deficits in aged mice.
- To elucidate the cellular mechanisms underlying ISRIB's effects on neuronal function and brain health.
Main Methods:
- Treatment of old mice with the ISR inhibitor ISRIB.
- Assessment of ISR activation markers, including ATF4 and phosphorylated eIF2.
- Evaluation of cognitive function using spatial and working memory tests.
- Analysis of neuronal electrophysiological properties and spine density in the hippocampus.
- Characterization of immune profiles in the brain, focusing on interferon and T cell responses.
Main Results:
- ISRIB treatment successfully reversed ISR activation in the brain.
- ISRIB administration ameliorated spatial and working memory deficits in old mice.
- Cellular analysis revealed that ISR inhibition restored neuronal electrophysiology and spine density.
- ISRIB treatment reduced specific immune responses, including interferon and T cell-mediated pathways, within the hippocampus.
Conclusions:
- Pharmacological inhibition of the ISR with ISRIB is a promising strategy for combating age-related cognitive decline.
- ISRIB effectively reverses cognitive impairments and restores neuronal health in aged individuals without neurodegenerative disease.
- Targeting the ISR offers a potential therapeutic avenue for enhancing cognitive function during the natural aging process.
