Cited by 42Neuroinflammation and Neurodegeneration MechanismsNeurogenesis and neuroplasticity mechanismsTryptophan and brain disorders

Microglial functional alteration and increased diversity in the challenged brain: Insights into novel targets for intervention

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Tremblay, Marie-Ève·2021·Brain, Behavior, & Immunity - Health

Abstract

Microglia are the resident immune cells of the central nervous system (CNS) parenchyma, which perform beneficial physiological roles across life. These immune cells actively maintain CNS health by clearing toxic debris and removing dysfunctional or degenerating cells. They also modify the wiring of neuronal circuits, by acting on the formation, modification, and elimination of synapses-the connections between neurons. Microglia furthermore recently emerged as highly diverse cells comprising several structural and functional states, indicating a far more critical involvement in orchestrating brain development, plasticity, behaviour, and cognition. Various environmental factors, together with the individual genetic predispositions, confer an increased risk for neurodevelopmental and neuropsychiatric disorders, as well as neurodegenerative diseases that include autism spectrum disorders, schizophrenia, major depressive disorder, and Alzheimer's disease, across life. Microglia are highly sensitive to chronic psychological stress, inadequate diet, viral/bacterial infection, pollution, and insufficient or altered sleep, especially during critical developmental periods, but also throughout life. These environmental challenges can compromise microglial physiological functions, resulting notably in defective neuronal circuit wiring, altered brain functional connectivity, and the onset of behavioral deficits into adolescence, adulthood, and aging. This short review provides a historical and technical perspective, notably focused on my contribution to the field, on how environmental challenges affect microglia, particularly their physiological functions, and increase their diversity, which provides novel targets for intervention.

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Crossref · 10.1016/j.bbih.2021.100301

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  • Microglia are essential for brain development and play a crucial role in preserving CNS health and maintaining homeostatic balance when challenged by infectious or inflammatory cues.

    “These cells are essential for brain development and play a crucial role in preserving the health of the CNS, maintaining its homeostatic balance when challenged by infectious or inflammatory cues [21, 22].”

    From Sex chromosomes and sex hormones differently shape microglial properties during normal physiological conditions in the adult mouse hippocampus (2025) · cites this paper as [21]

    The Introduction (page unavailable) describes microglia as crucial during development, and the Abstract says they actively maintain CNS health. But the Abstract and “Microglial response to environmental risk factors” (pages unavailable) say infection can compromise microglial functions; they do not establish that microglia maintain homeostatic balance when challenged by infectious or inflammatory cues. (LLM, conf=0.86)

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Authors
Tremblay, M.-È.
Affiliations
University of British Columbia (CA)
Corresponding author
Tremblay, Marie-Ève
Venue
Brain, Behavior, & Immunity - Health
Publisher
Elsevier BV
Published
2021-10
Volume
16
Pages
100301
ISSN
2666-3546 (ISSN-L)
OpenAlex
W3186653410
Cited by
42
References
123
Citations by year
2026: 6 · 2025: 5 · 2024: 14 · 2023: 7 · 2022: 9 · 2021: 1
FWCI
3.10
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior & Immunity - Health (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UVic’s Research and Learning Repository (University of Victoria) (submittedVersion)
Funders
University of Victoria
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
microglia, microglial heterogeneity, environmental problems, neurodevelopmental disorders, neuropsychiatric disorders, neurodegenerative diseases, chronic psychological stress, diet, viral and bacterial infections, pollution, sleep, brain functional connectivity, autism spectrum disorder, schizophrenia, major depressive disorder, Alzheimer's disease, therapeutic target

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