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The Hallmarks of Ageing in Microglia
Laura Carr1, Sanam Mustafa1,2, Lyndsey E Collins-Praino3,4
1School of Biomedicine, The University of Adelaide, Adelaide, Australia.
Cellular and Molecular Neurobiology
|May 19, 2025
Summary
Ageing causes changes in central nervous system cells, particularly microglia. Understanding these age-related microglial changes is crucial for developing better models of neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Gerontology
Background:
- Ageing is a significant risk factor for neurodegenerative diseases (NDs).
- Microglia, the immune cells of the central nervous system (CNS), are implicated in NDs.
- Distinguishing age-related microglial changes from disease-specific alterations is essential.
Purpose of the Study:
- To characterize the dynamic phenotypes of aged microglia.
- To evaluate the current understanding of microglial ageing in the context of the twelve hallmarks of ageing.
- To provide a foundation for developing more accurate models of neurodegenerative diseases.
Main Methods:
- Review and synthesis of existing literature on microglial ageing.
- Focus on the twelve hallmarks of ageing framework.
- Analysis of functional and morphological changes in aged microglia.
Main Results:
- Aged microglia are hypothesized to adopt a pro-inflammatory phenotype with dystrophic morphology.
- Functional changes in aged microglia are not as well-characterized as in other cell types like macrophages.
- The twelve hallmarks of ageing provide a framework for understanding microglial senescence.
Conclusions:
- Characterizing age-related changes in microglia is critical for understanding their role in neurodegeneration.
- Applying the twelve hallmarks of ageing to microglia offers a structured approach to studying their senescence.
- Improved understanding of microglial ageing will facilitate the development of more relevant neurodegenerative disease models.
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