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Updated: Jul 13, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Optimized isolation enables ex vivo analysis of microglia from various central nervous system regions
Alexander H de Haas1, Hendricus W G M Boddeke, Nieske Brouwer
1Department of Medical Physiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Abstract:
Ex vivo analysis is an accurate and convenient way to study in vivo microglia phenotype and function. However, current microglia isolation protocols for ex vivo analysis show many differences in isolation steps (perfusion, removal of meninges and blood vessels, mechanical dissociation, enzymatic dissociation, density separation, immunomagnetic separation, and fluorescence-activated cell sorting), often without addressing their effects on microglia purity, number, phenotype, and function. Therefore, the aim of this study was to provide an optimized isolation protocol with emphasis on microglia purity and number to enable ex vivo analysis of adult mouse microglia. The application of this protocol for ex vivo phenotype and functional analysis is corroborated by results from flow cytometry, gene expression analysis, chemotaxis, and phagocytosis assays. In addition, this study shows the possibility to analyze microglia isolated from various central nervous system regions such as optic nerve, striatum, hippocampus, spinal cord, cerebellum, and cerebral cortex. Furthermore, this is the first study presenting DRAQ5 as a superior alternative to propidium iodide for the discrimination between living and dead cells. DRAQ5 staining facilitated the identification of microglia upon flow cytometry without the need of additional fluorescent markers. Along with a favorable emission spectrum, DRAQ5 proved a valuable tool for flow cytometry of microglia. The presented optimized microglia isolation protocol for ex vivo analysis offers the opportunity to obtain more insight into both general and region-specific microglia behavior.
Insights
This study optimized microglia isolation for accurate ex vivo analysis, improving cell purity and number. The new protocol enables detailed microglia studies across various brain regions and introduces DRAQ5 for superior cell viability assessment.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Ex vivo analysis is crucial for studying microglia phenotype and function.
- Existing microglia isolation protocols vary significantly, impacting purity, yield, and cell characteristics.
- A standardized, optimized protocol is needed for reliable adult mouse microglia analysis.
Purpose of the Study:
- To develop an optimized protocol for isolating adult mouse microglia for ex vivo analysis.
- To emphasize maximizing microglia purity and cell number.
- To validate the protocol's effectiveness using various analytical methods.
Main Methods:
- Optimization of microglia isolation steps including perfusion, tissue dissociation, and cell separation.
- Application of flow cytometry, gene expression analysis, chemotaxis, and phagocytosis assays.
- Evaluation of DRAQ5 as a cell viability marker for microglia.
Main Results:
- The optimized protocol significantly enhances microglia purity and number.
- The protocol is effective for analyzing microglia from diverse central nervous system regions.
- DRAQ5 is identified as a superior alternative to propidium iodide for live/dead cell discrimination in microglia flow cytometry.
Conclusions:
- The optimized protocol provides a reliable method for ex vivo microglia analysis.
- This method allows for the investigation of both general and region-specific microglia behavior.
- DRAQ5 offers an improved approach for microglia identification and viability assessment in flow cytometry.
