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Updated: Apr 30, 2026
Culturing Microglia from the Neonatal and Adult Central Nervous System
Published on: August 9, 2013
Priming of microglia in a DNA-repair deficient model of accelerated aging
Divya D A Raj1, Dick Jaarsma2, Inge R Holtman1
1Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
Abstract:
Aging is associated with reduced function, degenerative changes, and increased neuroinflammation of the central nervous system (CNS). Increasing evidence suggests that changes in microglia cells contribute to the age-related deterioration of the CNS. The most prominent age-related change of microglia is enhanced sensitivity to inflammatory stimuli, referred to as priming. It is unclear if priming is due to intrinsic microglia ageing or induced by the ageing neural environment. We have studied this in Ercc1 mutant mice, a DNA repair-deficient mouse model that displays features of accelerated aging in multiple tissues including the CNS. In Ercc1 mutant mice, microglia showed hallmark features of priming such as an exaggerated response to peripheral lipopolysaccharide exposure in terms of cytokine expression and phagocytosis. Specific targeting of the Ercc1 deletion to forebrain neurons resulted in a progressive priming response in microglia exemplified by phenotypic alterations. Summarizing, these data show that neuronal genotoxic stress is sufficient to switch microglia from a resting to a primed state.
Insights
Neuronal genotoxic stress, not intrinsic microglia aging, primes these immune cells in the brain. This priming leads to exaggerated inflammatory responses, contributing to age-related central nervous system decline.
Area of Science:
- Neuroscience
- Immunology
- Aging Research
Background:
- Aging central nervous system (CNS) exhibits reduced function, degeneration, and neuroinflammation.
- Microglia, the resident immune cells of the CNS, undergo changes with age, including heightened sensitivity to inflammatory stimuli (priming).
- The cause of microglia priming—whether intrinsic aging or the aging neural environment—remains unclear.
Purpose of the Study:
- To investigate the role of neuronal genotoxic stress in microglia priming during aging.
- To determine if neuronal DNA repair deficiency can induce microglia priming.
Main Methods:
- Utilized Ercc1 mutant mice, a model for accelerated aging and DNA repair deficiency.
- Administered peripheral lipopolysaccharide to assess microglia inflammatory response and phagocytosis.
- Genetically targeted Ercc1 deletion specifically to forebrain neurons to isolate neuronal contribution.
Main Results:
- Ercc1 mutant mice displayed hallmark microglia priming, including exaggerated cytokine expression and phagocytosis upon inflammatory challenge.
- Targeting Ercc1 deletion to neurons induced a progressive microglia priming phenotype.
- Neuronal genotoxic stress was sufficient to transition microglia from a resting to a primed state.
Conclusions:
- Neuronal genotoxic stress, rather than intrinsic microglia aging, is a sufficient cause for microglia priming.
- This finding suggests that age-related neuronal damage can drive neuroinflammation.
- Understanding this mechanism is crucial for developing interventions for age-related CNS disorders.
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