Cited by 361Neuroinflammation and Neurodegeneration MechanismsInflammasome and immune disordersPhagocytosis and Immune Regulation

Factors regulating microglia activation

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Kierdorf, Katrin, Prinz, Marco·2013·Frontiers in Cellular Neuroscience

Abstract

Microglia are resident macrophages of the central nervous system (CNS) that display high functional similarities to other tissue macrophages. However, it is especially important to create and maintain an intact tissue homeostasis to support the neuronal cells, which are very sensitive even to minor changes in their environment. The transition from the "resting" but surveying microglial phenotype to an activated stage is tightly regulated by several intrinsic (e.g., Runx-1, Irf8, and Pu.1) and extrinsic factors (e.g., CD200, CX3CR1, and TREM2). Under physiological conditions, minor changes of those factors are sufficient to cause fatal dysregulation of microglial cell homeostasis and result in severe CNS pathologies. In this review, we discuss recent achievements that gave new insights into mechanisms that ensure microglia quiescence.

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Crossref · 10.3389/fncel.2013.00044

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  • This highlights age-dependent change in microglial plasticity.

    “highlighting the age-dependent change in microglial plasticity [53, 55].”
  • Expression of microglial surface receptors CX3CR1, P2RY12, and TREM2 and TLRs tends to negatively correlate with age.

    “Further analysis revealed that microglia surface receptors for microglia-neuron crosstalk (CX3CR1, P2RY12, and TREM2) and TLRs for communication with pathogen-associated molecular patterns tended to show a negative correlation between gene expression level and age, highlighting the age-dependent change in microglial plasticity [53, 55].”
  • This suggests a reactive state and reduced plasticity in adult microglia, possibly due to repeated infections and debris clearance.

    “suggesting their reactive state and reduced plasticity in the adult stage possibly due to repetitive exposure to infectious agents and active removal of cell debris [53, 55].”
  • During maturation and aging, pro-inflammatory gene expression increases in adult microglia.

    “With maturation and aging, expression of pro-inflammatory genes in adult microglia increase, suggesting their reactive state and reduced plasticity in the adult stage possibly due to repetitive exposure to infectious agents and active removal of cell debris [53, 55].”
  • Microglia account for approximately 5-12% of total brain cells and are distributed unevenly, with greater densities in grey matter and structures such as hippocampus, basal ganglia, and substantia nigra than in white matter.

    “Microglia represent a heterogeneous cell population accounting for approximately 5–12% of total brain cells. They are distributed unevenly throughout the CNS, as grey matter and specific structures such as the hippocampus, basal ganglia, and substantia nigra typically all exhibit greater densities than the white matter (58–60).”

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Authors
Kierdorf, K., & Prinz, M.
Affiliations
University of Freiburg (DE)
Corresponding author
Prinz, Marco
Venue
Frontiers in Cellular Neuroscience
Published
2013
Volume
7
Pages
44-44
ISSN
1662-5102 (ISSN-L)
OpenAlex
W2149538964
Cited by
360
References
83
Citations by year
2026: 11 · 2025: 19 · 2024: 21 · 2023: 22 · 2022: 22 · 2021: 43 · 2020: 40 · 2019: 30 · 2018: 30 · 2017: 28 · 2016: 23 · 2015: 31 · 2014: 31 · 2013: 7
FWCI
17.17
Type
journal article
Language
en
Open access
Licence
cc-by
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
  • Deutsche Forschungsgemeinschaft (PR 577/8-2)
  • Bundesministerium für Bildung und Forschung (PR 577/8-2)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
microglial activation, microglial homeostasis, central nervous system, IRF8, PU.1, CD200, CX3CR1, TREM2, neuroinflammation, CNS pathology

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