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Updated: Jul 4, 2025
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Microglia maintain structural integrity during fetal brain morphogenesis
Akindé René Lawrence1, Alice Canzi1, Cécile Bridlance2
1Institut de Biologie de l'École Normale Supérieure (IBENS), École Normale Supérieure, CNRS, INSERM, Université PSL, Team Brain Development and Plasticity, 75005 Paris, France.
Abstract:
Microglia (MG), the brain-resident macrophages, play major roles in health and disease via a diversity of cellular states. While embryonic MG display a large heterogeneity of cellular distribution and transcriptomic states, their functions remain poorly characterized. Here, we uncovered a role for MG in the maintenance of structural integrity at two fetal cortical boundaries. At these boundaries between structures that grow in distinct directions, embryonic MG accumulate, display a state resembling post-natal axon-tract-associated microglia (ATM) and prevent the progression of microcavities into large cavitary lesions, in part via a mechanism involving the ATM-factor Spp1. MG and Spp1 furthermore contribute to the rapid repair of lesions, collectively highlighting protective functions that preserve the fetal brain from physiological morphogenetic stress and injury. Our study thus highlights key major roles for embryonic MG and Spp1 in maintaining structural integrity during morphogenesis, with major implications for our understanding of MG functions and brain development.
Insights
Embryonic microglia (MG) maintain fetal brain structural integrity by preventing and repairing lesions at cortical boundaries. These brain-resident macrophages utilize mechanisms involving Spp1, crucial for development.
Area of Science:
- Neuroscience
- Developmental Biology
- Immunology
Background:
- Microglia (MG), the brain's resident immune cells, exhibit diverse states and functions.
- Embryonic MG heterogeneity and specific roles in fetal brain development are not well understood.
Purpose of the Study:
- To investigate the function of embryonic microglia in maintaining fetal brain structural integrity.
- To identify molecular mechanisms underlying MG-mediated protection during brain development.
Main Methods:
- Analysis of embryonic microglia distribution and transcriptomic states.
- Investigation of MG roles at fetal cortical boundaries using cellular and molecular approaches.
- Assessment of the involvement of Spp1 in MG functions.
Main Results:
- Embryonic microglia accumulate at specific fetal cortical boundaries.
- MG adopt a state similar to post-natal axon-tract-associated microglia (ATM).
- MG and Spp1 prevent microcavity progression and promote lesion repair, preserving structural integrity.
Conclusions:
- Embryonic microglia play critical roles in maintaining fetal brain structural integrity during morphogenesis.
- The ATM-factor Spp1 is implicated in MG-mediated protective functions.
- These findings offer insights into MG functions and brain development, with implications for neurodevelopmental disorders.
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