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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
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Aged Mouse Cortical Microglia Display an Activation Profile Suggesting Immunotolerogenic Functions
Tanja Zöller1, Abdelraheim Attaai2,3,4, Phani Sankar Potru5
1Institute for Anatomy and Cell Biology, Department of Molecular Embryology, Faculty of Medicine, University of Freiburg, Freiburg 79104, Germany. tanja.zoeller@googlemail.com.
International Journal of Molecular Sciences
|March 2, 2018
Summary
Aging impairs cortical microglia, decreasing their numbers and shifting their activation profile toward immunosuppressive functions. This study reveals age-related changes in microglia gene expression and markers, impacting central nervous system immunity.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are key immune cells in the central nervous system (CNS).
- Age-related changes in microglia may contribute to neurodegenerative diseases.
- Understanding microglia aging is crucial for CNS health.
Purpose of the Study:
- To investigate age-dependent alterations in cortical microglia gene expression.
- To analyze changes in M1 and M2-like activation markers in aged microglia.
- To determine the functional implications of microglia aging in the CNS.
Main Methods:
- Iba1 immunohistochemistry to assess microglia numbers.
- Fluorescence-activated cell sorting (FACS) for microglia isolation and RNA analysis.
- RNA sequencing to identify transcriptional changes in aged cortical microglia.
Main Results:
- Aging led to a decrease in the number of cortical microglia.
- A distinct microglia activation profile emerged with upregulated genes (e.g., Ifi204, Lilrb4).
- Aged microglia showed increased expression of Cd206 and Cd36, indicating specific activation states.
Conclusions:
- Aged mouse cortical microglia exhibit a unique activation profile.
- This profile suggests a shift towards immunosuppressive and immuno-tolerogenic functions.
- Microglia aging significantly impacts CNS immune responses and potentially neurodegeneration.
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