Cited by 424Neuroinflammation and Neurodegeneration MechanismsNeuroscience and Neuropharmacology ResearchNeurological Disease Mechanisms and Treatments

Dark microglia: A new phenotype predominantly associated with pathological states

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Bisht, Kanchan, Sharma, Kaushik P., Lecours, Cynthia, Gabriela Sánchez, Maria, El Hajj, Hassan, Milior, Giampaolo, Olmos‐Alonso, Adrián, Gómez‐Nicola, Diego +7 more·2016·Glia

Abstract

The past decade has witnessed a revolution in our understanding of microglia. These immune cells were shown to actively remodel neuronal circuits, leading to propose new pathogenic mechanisms. To study microglial implication in the loss of synapses, the best pathological correlate of cognitive decline across chronic stress, aging, and diseases, we recently conducted ultrastructural analyses. Our work uncovered the existence of a new microglial phenotype that is rarely present under steady state conditions, in hippocampus, cerebral cortex, amygdala, and hypothalamus, but becomes abundant during chronic stress, aging, fractalkine signaling deficiency (CX 3 CR1 knockout mice), and Alzheimer's disease pathology (APP‐PS1 mice). Even though these cells display ultrastructural features of microglia, they are strikingly distinct from the other phenotypes described so far at the ultrastructural level. They exhibit several signs of oxidative stress, including a condensed, electron‐dense cytoplasm and nucleoplasm making them as “dark” as mitochondria, accompanied by a pronounced remodeling of their nuclear chromatin. Dark microglia appear to be much more active than the normal microglia, reaching for synaptic clefts, while extensively encircling axon terminals and dendritic spines with their highly ramified and thin processes. They stain for the myeloid cell markers IBA1 and GFP (in CX 3 CR1‐GFP mice), and strongly express CD11b and microglia‐specific 4D4 in their processes encircling synaptic elements, and TREM2 when they associate with amyloid plaques. Overall, these findings suggest that dark microglia, a new phenotype that we identified based on their unique properties, could play a significant role in the pathological remodeling of neuronal circuits, especially at synapses. GLIA 2016;64:826–839

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  • Dysregulation of microglial functions is associated with several health concerns that often show sex prevalences, including Alzheimer's disease (more prevalent among females), Parkinson's disease (more male-prevalent), and various other neurodevelopmental, neuropsychiatric and neurodegenerative disorders.

    “Dysregulation of microglial functions is associated with several health concerns that often show sex prevalences, not only affecting Alzheimer’s disease, which shows more prevalence among females, and Parkinson’s disease, more male-prevalent, but also including various other neurodevelopmental, neuropsychiatric and neurodegenerative disorders [38–43].”

    From Sex chromosomes and sex hormones differently shape microglial properties during normal physiological conditions in the adult mouse hippocampus (2025) · cites this paper as [38]

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  1. Butovsky O, Jedrychowski MP, Cialic R, Krasemann S, Murugaiyan G, Fanek Z, Greco DJ, Wu PM, Doykan CE, Kiner O, Lawson RJ, Frosch MP, Pochet N, Fatimy RE, Krichevsky AM, Gygi SP, Lassmann H, Berry J, Cudkowicz ME, Weiner HL. 2014 Targeting miR‐155 restores abnormal microglia and attenuates disease in SOD1 mice. Ann Neurol 77: 75– 99. 25381879 PMC4432483
  2. Tremblay ME, Sierra A, editors. 2014 Microglia in health and disease. New York: Springer 486 pp.
  3. Tremblay ME, Stevens B, Sierra A, Wake H, Bessis A, Nimmerjahn A. 2011 The role of microglia in the healthy brain. J Neurosci 31: 16064– 16069. 22072657 PMC6633221

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Authors
Bisht, K., Sharma, K. P., Lecours, C., Gabriela Sánchez, M., El Hajj, H., Milior, G., Olmos‐Alonso, A., Gómez‐Nicola, D., Luheshi, G., Vallières, L., Branchi, I., Maggi, L., Limatola, C., Butovsky, O., & Tremblay, M.
Affiliations
  • Centre de recherche du CHU de Québec-Université Laval (CA)
  • Axe Neurosciences Centre De Recherche Du CHU De Québec Québec Québec Canada
  • Istituto Pasteur (IT)
  • University of Southampton (GB)
  • Douglas Mental Health University Institute (CA)
  • Istituto Superiore di Sanità (IT)
  • Brigham and Women's Hospital (US)
Corresponding author
Tremblay, Marie‐Ève
Venue
Glia
Publisher
Wiley
Published
2016-02-05
Volume
64
Issue
5
Pages
826-839
ISSN
  • 0894-1491 (ISSN-L)
  • 1098-1136
OpenAlex
W2256955303
Cited by
421
References
68
Citations by year
2026: 25 · 2025: 36 · 2024: 52 · 2023: 48 · 2022: 44 · 2021: 64 · 2020: 42 · 2019: 42 · 2018: 30 · 2017: 26 · 2016: 12
FWCI
20.09
Type
journal article
Language
en
Open access
Locations
  • Glia (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • IRIS Research product catalog (Sapienza University of Rome) (submittedVersion, cc-by)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
  • Natural Sciences and Engineering Research Council of Canada (NSERC) (RGPIN-2014-05308)
  • Medical Research Council (MR/K022687/1)
  • The Banting Research Foundation
  • The Scottish Rite Charitable Foundation of Canada
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
microglial phenotype, oxidative stress, chronic stress, aging, CX3CR1, Alzheimer's disease, APP/PS1 mice, amyloid plaques, TREM2, synaptic loss, dendritic spines, axon terminals, hippocampus, cerebral cortex, amygdala, hypothalamus
MeSH terms
CX3C Chemokine Receptor 1, Formyltetrahydrofolate Dehydrogenase, Aging, Aldehyde Dehydrogenase, Alzheimer Disease, Oxidoreductases Acting on CH-NH Group Donors, Animals, Cerebral Cortex, Disease Models, Animal, Mice, Inbred C57BL, Mice, Transgenic, Nerve Tissue Proteins, Phenotype, Stress, Psychological, Antigens, CD, Amyloid beta-Protein Precursor, Microglia, Receptors, Chemokine, Green Fluorescent Proteins, Mice, Presenilin-1

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