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Updated: Aug 11, 2025
Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
Published on: February 16, 2018
Microglia isolation from aging mice for cell culture: A beginner's guide
Akshay Kumar Vijaya1, Monika Iešmantaitė1, Virginia Mela2
1Department of Biological Models, Institute of Biochemistry, Life Sciences Center, Vilnius University, Vilnius, Lithuania.
Abstract:
Microglia, the innate immune cell of the central nervous system, play significant roles in brain development, maintenance, homeostasis, and neuroinflammation. Although numerous methods have been developed to isolate microglia from embryonic or postnatal mouse brains, still major difficulties exist in isolating microglia from adult mice, often resulting in low yield and risk of cellular activation. Therefore, there is a need for a more efficient method to isolate pure and high-yield microglia from adult mice to study various neurodegenerative diseases. The aim of this study was to develop a fully functional protocol for the isolation of microglia by comparing different protocols. We investigated the efficacy of three protocols in terms of cell yield, purity, cellular activation, cellular aging, and migration properties and proposed the modified protocol (PROTOCOL 1), which provides an optimal yield of functional microglial cells with a minimum of material and equipment and allows young researchers with little experience to isolate microglia and helps them to delve deeper into the world of neuroscience.
Insights
Researchers developed an improved method to isolate microglia, the brain's immune cells, from adult mice. This new protocol ensures high yield and purity, aiding neurodegenerative disease research.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are crucial innate immune cells in the central nervous system, involved in development, homeostasis, and neuroinflammation.
- Existing methods for isolating microglia from adult mice often yield low cell numbers and risk activation, hindering research.
- Efficient isolation of pure, functional microglia from adult brains is essential for studying neurodegenerative diseases.
Purpose of the Study:
- To develop and validate an optimized protocol for isolating pure, high-yield microglia from adult mouse brains.
- To compare the efficacy of different isolation protocols based on cell yield, purity, activation, aging, and migration.
- To provide a reliable and accessible method for researchers studying microglia in adult CNS.
Main Methods:
- Evaluation of three distinct protocols for microglial isolation from adult mouse brains.
- Assessment of key parameters including cell yield, purity, cellular activation markers, cellular aging indicators, and migratory capacity.
- Development and proposal of a modified protocol (PROTOCOL 1) based on comparative analysis.
Main Results:
- The modified protocol (PROTOCOL 1) demonstrated superior performance in isolating functional microglia.
- PROTOCOL 1 offers an optimal balance of high cell yield and purity with minimal resource requirements.
- The protocol is designed to be accessible for researchers with limited experience, facilitating microglial research.
Conclusions:
- A novel, efficient protocol (PROTOCOL 1) for isolating high-quality microglia from adult mice has been established.
- This method addresses the limitations of existing techniques, improving the study of microglia in adult CNS conditions.
- The protocol empowers researchers, particularly early-career scientists, to advance neuroscience research, especially in neurodegenerative disease.
