Isolation of murine microglial cells for RNA analysis or flow cytometry
Abstract
There is increasing interest in the isolation of adult microglia to study their functions at a morphological and molecular level during normal and neuroinflammatory conditions. Microglia have important roles in brain homeostasis, and in disease states they exert neuroprotective or neurodegenerative functions. To assay expression profiles or functions of microglia, we have developed a method to isolate microglial cells and infiltrating leukocytes from adult mouse brain. This protocol uses a digestion cocktail containing collagenase and dispase, and it involves separation over discontinuous percoll gradients. Isolated cells can be used for RNA analysis, including RNase protection analysis (RPA), quantitative RT-PCR, high-density microarray, proteomic or flow cytometric characterization of cell surface markers or adoptive transfer. Cell isolation can be completed in less than 4 h.
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Previous reports comparing cell isolation protocols or cells postisolation have often focused on aspects such as cell viability and/or yield over whether the isolated cells are truly reflective of their in vivo state.
“Previous reports comparing cell isolation protocols or cells postisolation have often focused on aspects such as cell viability and/or yield4,62 over whether the isolated cells are truly reflective of their in vivo state13,14.”
From Dissection of artifactual and confounding glial signatures by single-cell sequencing of mouse and human brain (2022) · cites this paper as [4]
Many widely used protocols for microglial isolation continue to include enzymatic digestion, likely because some experimental conditions require greater yield.
“Some experimental conditions may dictate the need for greater yield, especially for older or less-sensitive approaches (including many older bulk RNA-sequencing (RNA-seq) studies or protein-based analyses), which is likely why many widely used and widely cited protocols for microglial isolation continue to include enzymatic digestion4,63,64.”
From Dissection of artifactual and confounding glial signatures by single-cell sequencing of mouse and human brain (2022) · cites this paper as [4]
Anti-FCRLS and anti-P2ry12 antibodies stain adult microglia isolated from naïve murine brain but did not stain CD11b-gated myeloid cells from murine spleen, bone marrow and peripheral blood.
“FACS analysis shows that anti-FCRLS and anti-P2ry12 antibodies stain adult microglia isolated by conventional methods22 from naïve murine brain but did not stain CD11b-gated myeloid cells from murine spleen, bone marrow and peripheral blood (Fig. 4a).”
From Identification of a unique TGF-β–dependent molecular and functional signature in microglia (2014) · cites this paper as [22]
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- Authors
- Cardona, A. E., Huang, D., Sasse, M. E., & Ransohoff, R. M.
- Affiliations
- Cleveland Clinic (US)
- Corresponding author
- Ransohoff, Richard M
- Venue
- Nature Protocols
- Published
- 2006-11
- Volume
- 1
- Issue
- 4
- Pages
- 1947-1951
- ISSN
- 1750-2799 (ISSN-L)
- 1754-2189
- OpenAlex
- W2088301466
- Cited by
- 236
- References
- 35
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 5 · 2023: 8 · 2022: 20 · 2021: 24 · 2020: 15 · 2019: 11 · 2018: 20 · 2017: 17 · 2016: 15 · 2015: 12 · 2014: 19 · 2013: 17 · 2012: 11
- FWCI
- 1.32
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature Protocols (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Multiple Sclerosis Society
- National Institutes of Health
- National Institute of Neurological Disorders and Stroke (NS32151, R01NS032151)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
- Keywords
- microglia isolation, microglial cells, mouse brain, collagenase digestion, Percoll gradient separation, infiltrating leukocytes, neuroinflammation, cell surface markers, adoptive transfer, RNA expression profiling
- MeSH terms
- Animals, Cell Separation, Flow Cytometry, RNA, Microglia, Mice
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