Cited by 72Neuroinflammation and Neurodegeneration MechanismsInflammasome and immune disordersNeurological Disease Mechanisms and Treatments

Organotypic Brain Slice Culture Microglia Exhibit Molecular Similarity to Acutely-Isolated Adult Microglia and Provide a Platform to Study Neuroinflammation

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Delbridge, Alex R. D., Huh, Dann, Brickelmaier, Margot, Burns, Jeremy C., Roberts, Chris, Challa, Ravi, Raymond, Naideline, Cullen, Patrick +11 more·2020·Frontiers in Cellular Neuroscience

Abstract

Microglia are central nervous system (CNS) resident immune cells that have been implicated in neuroinflammatory pathogenesis of a variety of neurological conditions. Their manifold context-dependent contributions to neuroinflammation are only beginning to be elucidated, which can be attributed in part to the challenges of studying microglia in vivo and the lack of tractable in vitro systems to study microglia function. Organotypic brain slice cultures offer a tissue-relevant context that enables the study of CNS resident cells and the analysis of brain slice microglial phenotypes has provided important insights, in particular into neuroprotective functions. Here we use RNA sequencing, direct digital quantification of gene expression with nCounter® technology and targeted analysis of individual microglial signature genes, to characterize brain slice microglia relative to acutely-isolated counterparts and 2-dimensional (2D) primary microglia cultures, a widely used in vitro surrogate. Analysis using single cell and population-based methods found brain slice microglia exhibited better preservation of canonical microglia markers and overall gene expression with stronger fidelity to acutely-isolated adult microglia, relative to in vitro cells. We characterized the dynamic phenotypic changes of brain slice microglia over time, after plating in culture. Mechanical damage associated with slice preparation prompted an initial period of inflammation, which resolved over time. Based on flow cytometry and gene expression profiling we identified the 2-week timepoint as optimal for investigation of microglia responses to exogenously-applied stimuli as exemplified by treatment-induced neuroinflammatory changes observed in microglia following LPS, TNF and GM-CSF addition to the culture medium. Altogether these findings indicate that brain slice cultures provide an experimental system superior to in vitro culture of microglia as a surrogate to investigate microglia functions, and the impact of soluble factors and cellular context on their physiology.

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Crossref · 10.3389/fncel.2020.592005

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  • Microglia in organotypic brain slice cultures resemble in vivo microglia more than primary cultured microglia, about 50% are non-homeostatic, and overexpress markers associated with microglia in neurodegenerative disease.

    “Furthermore, while microglia in organotypic brain slice cultures resemble in vivo microglia more than primary cultured microglia, about 50% of these cells are non-homeostatic (either proliferative, inflammatory, or reactive), and overexpress markers associated with microglia in neurodegenerative disease [9].”

    From Culture shock: microglial heterogeneity, activation, and disrupted single-cell microglial networks in vitro (2022) · cites this paper as [9]

    The Results section reports that slice-culture microglia more closely resemble acutely isolated adult microglia than primary cultured microglia, and identifies proliferative, inflammatory, and reactive clusters. It also reports increased expression of neurodegeneration-associated signatures, particularly at three weeks. Our copy does not establish that about 50% of slice-culture microglia are non-homeostatic; cluster proportions vary with culture timepoint, which the claim does not specify. (LLM, conf=0.84)

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  • In general, microglia across in vitro systems suffer from disseminated molecular changes attributed to loss of signaling with other cells in the brain microenvironment that is required to maintain them in a homeostatic state.

    “In general, microglia across in vitro systems suffer from disseminated molecular changes attributed to loss of signaling with other cells in the brain microenvironment that is required to maintain them in a homeostatic state.”

    From Culture shock: microglial heterogeneity, activation, and disrupted single-cell microglial networks in vitro (2022) · cites this paper as [9]

    The Results report extensive gene-expression differences in conventionally cultured microglia, and the Discussion links preservation of microglial identity to interactions with other CNS cells (page numbers unavailable). But the paper describes that link as a proposed explanation, not an established cause. It also finds that organotypic brain-slice cultures—an in vitro system—preserve microglial identity better, so the claim is too broad in applying the changes across in vitro systems. (LLM, conf=0.88)

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Authors
Delbridge, A. R. D., Huh, D., Brickelmaier, M., Burns, J. C., Roberts, C., Challa, R., Raymond, N., Cullen, P., Carlile, T. M., Ennis, K. A., Liu, M., Sun, C., Allaire, N. E., Foos, M., Tsai, H.-H., Franchimont, N., Ransohoff, R. M., Butts, C., & Mingueneau, M.
Affiliations
Biogen (United States) (US)
Venue
Frontiers in Cellular Neuroscience
Published
2020-12-21
Volume
14
Pages
592005-592005
ISSN
1662-5102 (ISSN-L)
OpenAlex
W3116215660
Cited by
72
References
95
Citations by year
2026: 16 · 2025: 11 · 2024: 17 · 2023: 9 · 2022: 14 · 2021: 5
FWCI
2.71
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Biogen
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
microglia, organotypic brain slice culture, neuroinflammation, microglial phenotype, microglial gene expression, microglial activation, LPS, TNF-α, GM-CSF

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