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Updated: May 29, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Physiological roles of microglia during development
Lorena Pont-Lezica1, Catherine Béchade, Yasmine Belarif-Cantaut
1Institut de Biologie de l'Ecole Normale Supérieure, INSERM 1024 - CNRS 8197, Paris, France.
Abstract:
In all the species examined thus far, the behavior of microglia during development appears to be highly stereotyped. This reproducibility supports the notion that these cells have a physiological role in development. Microglia are macrophages that migrate from the yolk sac and colonize the central nervous system early during development. The first invading yolk-sac macrophages are highly proliferative and their role has not yet been addressed. At later developmental stages, microglia can be found throughout the brain and tend to preferentially reside at specific locations that are often associated with known developmental processes. Thus, it appears that microglia concentrate in areas of cell death, in proximity of developing blood vessels, in the marginal layer, which contains developing axon fascicles, and in close association with radial glial cells. This review describes the main features of brain colonization by microglia and discusses the possible physiological roles of these cells during development.
Insights
Microglia, immune cells in the brain, exhibit consistent developmental behavior across species, suggesting a crucial physiological role. Their migration and localization patterns highlight involvement in key developmental processes.
Area of Science:
- Neuroscience
- Developmental Biology
- Immunology
Background:
- Microglia are the primary immune cells of the central nervous system.
- These cells originate from yolk sac macrophages and colonize the brain early in development.
- Their precise roles during neurodevelopment are not fully understood.
Purpose of the Study:
- To review the colonization patterns of microglia in the developing brain.
- To discuss the potential physiological functions of microglia during development.
- To highlight the stereotyped behavior of microglia across species.
Main Methods:
- Review of existing literature on microglia development and behavior.
- Analysis of microglia localization in relation to developmental processes.
- Comparative examination across different species.
Main Results:
- Microglia colonization of the central nervous system is a highly stereotyped process.
- Early yolk sac-derived macrophages are highly proliferative.
- Later, microglia preferentially accumulate in areas of cell death, near developing vasculature, in the marginal layer, and near radial glial cells.
Conclusions:
- The consistent behavior of microglia during development strongly suggests a significant physiological role.
- Microglia localization indicates involvement in critical neurodevelopmental events.
- Further research is warranted to elucidate the specific functions of microglia in brain development.
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