Microglial Function in Neural Development and Regeneration
Summary
Microglia are the central nervous system’s resident macrophages, emerging early in embryogenesis and persisting throughout life. In neural development, they sculpt synaptic circuits through targeted surveillance, synaptic pruning and secretion of trophic factors that guide neuronal survival and connectivity. During adulthood and following injury, microglia adopt diverse activation states that balance pro-inflammatory clearance of debris with release of cytokines and growth factors to support remyelination and neurogenesis. Epigenetic reprogramming and innate immune memory enable microglia to adapt their responses to successive challenges, with significant implications for recovery after trauma, degenerative disease and demyelinating disorders. Dysregulation of these functions underlies a range of neurodevelopmental and neuropsychiatric conditions, while precise modulation of microglial activity offers promising avenues for regenerative therapies.
Research from Nature Portfolio
Recent studies have demonstrated that an early postnatal immune challenge can induce sex-specific epigenetic reprogramming of microglia, resulting in heightened phagocytic activity and aberrant synapse removal in male animals. This persistent shift in functional state leads to long-lasting behavioural impairments and a deficit of excitatory synapses within key learning and memory regions. The work underscores how transient peripheral inflammation in the neonatal period can durably alter microglial gene expression programmes, synaptic interactions and circuit maturation in a sex-dependent manner, revealing critical windows during which microglial modulation may prevent enduring deficits.
Microglial Function in Neural Development and Regeneration publication trend
The graph below shows the total number of articles in microglial function in neural development and regeneration across all publications each year (not limited to Nature Index journals).
Technical terms
Microglia: Tissue-resident immune cells of the brain responsible for surveillance, synaptic remodelling and clearance of apoptotic cells.
Phagocytosis: Receptor-mediated engulfment and intracellular degradation of debris or apoptotic cells by microglia.
Epigenetic reprogramming: Stable changes in gene expression driven by modifications to chromatin structure, such as DNA methylation or histone modification, without altering DNA sequence.
Oligodendrogenesis: Differentiation of precursor cells into oligodendrocytes that form myelin sheaths around axons.
Neurogenesis: Generation of new neurons from neural stem or progenitor cells, particularly within the hippocampal dentate gyrus.
Immune memory: Lasting alteration of microglial responsiveness following repeated inflammatory stimuli, influencing future activation profiles.
References
- Neonatal immune challenge poses a sex-specific risk for epigenetic microglial reprogramming and behavioral impairment. Nature Communications (2023).
- TREX1 is required for microglial cholesterol homeostasis and oligodendrocyte terminal differentiation in human neural assembloids. Molecular Psychiatry (2023).
- The role of microglia in early neurodevelopment and the effects of maternal immune activation. Seminars in Immunopathology (2024).
- Microglia Actively Remodel Adult Hippocampal Neurogenesis through the Phagocytosis Secretome. Journal of Neuroscience (2020).
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