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Microglial Replacement Reverses Age-Associated Epigenetic Modifications Despite Accelerating Epigenetic Age
Maria Arbaizar-Rovirosa1,2, Raúl F Pérez3, Alfonso Peñarroya4,5,6,7
1Cerebrovascular Research Laboratory, Instituto de Investigaciones.
Aging and Disease
|October 24, 2025
Summary
Microglial replacement may rejuvenate the brain by reversing age-related DNA methylation changes. This process, while accelerating epigenetic age, shows potential for treating age-related brain disorders.
Area of Science:
- Neuroscience
- Epigenetics
- Immunology
Background:
- Microglial replacement is a potential therapy for age-related brain disorders.
- The impact of microglial replacement on epigenetic age is not well understood.
Purpose of the Study:
- To investigate DNA methylation changes in microglia during aging.
- To assess the effects of ischemic stroke and microglial depletion/repopulation (D/R) on microglial epigenetic age.
- To determine if microglial repopulation reverses age-associated epigenetic changes.
Main Methods:
- Analysis of DNA methylation dynamics in microglia from young and old mice.
- Application of epigenetic clocks to assess epigenetic age.
- Genome-wide methylation profiling using DNA methylation arrays.
- Evaluation of microglial D/R models and ischemic stroke.
Main Results:
- Old microglia exhibit an aged DNA methylation profile.
- Both stroke and microglial D/R accelerated epigenetic age.
- Microglial repopulation reversed significant age-associated DNA methylation changes, especially in immune pathways.
Conclusions:
- Microglial D/R accelerates epigenetic age but also reverses aging-associated methylation patterns.
- Microglial replacement strategies may promote brain rejuvenation by reversing epigenetic aging.
- Epigenetic age measures require careful interpretation in the context of cellular dynamics.
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