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Microglia: Mediators of experience-driven corrective neuroplasticity.
Lara Rogerson-Wood1, Atomu Sawatari1, Catherine A Leamey1
1School of Medical Sciences (Neuroscience theme), Faculty of Medicine and Health, University of Sydney, NSW 2006, Australia.
IBRO Neuroscience Reports
|July 2, 2025
Summary
Early life environmental enrichment (EE) can correct miswired neural connections in mice with genetic defects. This occurs through microglia-mediated synaptic pruning during a critical developmental window.
Area of Science:
- Neuroscience
- Developmental Biology
- Immunology
Background:
- Neural connectivity, crucial for brain function, is established by axon guidance and refined by synaptic pruning.
- Alterations in these processes are linked to neurodevelopmental disorders.
- Microglia, the brain's immune cells, mediate synaptic pruning, but their role in correcting genetic axon guidance defects is unclear.
Purpose of the Study:
- To investigate if targeted microglial synaptic pruning can compensate for altered neural connectivity due to genetic axon guidance defects.
- To examine the impact of Environmental Enrichment (EE) on visual circuitry in mice lacking the axon guidance molecule Ten-m3.
Main Methods:
- Studied Ten-m3 knockout mice exposed to Environmental Enrichment (EE) around birth.
- Analyzed visual circuitry, specifically retinal inputs in the visual thalamus.
- Investigated microglial involvement in synaptic pruning.
Main Results:
- Early EE exposure (around birth) selectively removed miswired retinal inputs in Ten-m3 knockout mice.
- This effect was not observed when EE started later (from weaning).
- Microglial engulfment of neural connections during a specific postnatal window mediated the EE effect.
Conclusions:
- Early life experience, particularly EE, plays a critical role in shaping neural circuitry, especially when early development is compromised.
- Microglia-mediated synaptic pruning is a key mechanism by which early EE can correct developmental wiring errors.
- Findings support the potential of experience-based interventions for human neurodevelopmental conditions.
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