Cited by 2,599Neuroinflammation and Neurodegeneration MechanismsNeuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanisms

Microglia promote learning-dependent synapse formation through brain-derived neurotrophic factor

Open access
Parkhurst, Christopher N., Yang, Guang, Ninan, Ipe, Savas, Jeffrey N., Yates, John R., Lafaille, Juan J., Hempstead, Barbara L., Littman, Dan R. +1 more·2013·Cell

Abstract

Microglia are the resident macrophages of the CNS, and their functions have been extensively studied in various brain pathologies. The physiological roles of microglia in brain plasticity and function, however, remain unclear. To address this question, we generated CX3CR1(CreER) mice expressing tamoxifen-inducible Cre recombinase that allow for specific manipulation of gene function in microglia. Using CX3CR1(CreER) to drive diphtheria toxin receptor expression in microglia, we found that microglia could be specifically depleted from the brain upon diphtheria toxin administration. Mice depleted of microglia showed deficits in multiple learning tasks and a significant reduction in motor-learning-dependent synapse formation. Furthermore, Cre-dependent removal of brain-derived neurotrophic factor (BDNF) from microglia largely recapitulated the effects of microglia depletion. Microglial BDNF increases neuronal tropomyosin-related kinase receptor B phosphorylation, a key mediator of synaptic plasticity. Together, our findings reveal that microglia serve important physiological functions in learning and memory by promoting learning-related synapse formation through BDNF signaling.

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Crossref · 10.1016/j.cell.2013.11.030

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  • BDNF is widely expressed in neurons, astrocytes, and microglia, with microglia regarded as the primary source of BDNF.

    “BDNF is widely expressed in neurons, astrocytes, and microglia, among which microglia are regarded as the primary source of BDNF (162).”

    From Nociplastic pain: the prominent role of non-neuronal cells in central and peripheral sensitization (2026) · cites this paper as [162]

    The Discussion section confirms that BDNF can be detected in neurons, astrocytes, and microglia. But it explicitly says that neurons, not microglia, appear to be the major source of BDNF in the adult brain. (LLM, conf=0.95)

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  • No leakiness was reported in those studies using the YFP reporter line to verify two inducible Cx3cr1-CreERT2 lines.

    “No leakiness was reported in those studies.”

    From Targeting Microglia Using Cx3cr1-Cre Lines: Revisiting the Specificity (2019) · cites this paper as Parkhurst et al., 2013

    The Results section, “Generation of CX3CR1CreER mice to manipulate gene expression in microglia” (page not available), reports DsRed-positive microglia even without tamoxifen, contrary to the claim that no leakiness was reported. EYFP marked cells expressing the CreER transcript; the paper used a DsRed reporter to test Cre-mediated recombination. (LLM, conf=0.89)

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  • In the CX3CR1CreER-iresGFP/+;Rosa26stop-DsRed system, CNS microglia retain DsRed expression 30 days after tamoxifen whereas peripheral macrophages do not due to ongoing turnover; both cell types constitutively express GFP.

    “In this system, CNS microglia retain their DsRed expression 30 days after tamoxifen treatment whereas peripheral macrophages do not due to ongoing turnover; both cell types constitutively express GFP under control of the CX3CR1 promoter (Parkhurst et al., 2013).”

    From Activated microglia drive demyelination via <scp>CSF1R</scp> signaling (2021) · cites this paper as Parkhurst et al., 2013

    The Results section ('Cre-dependent manipulation of gene expression in microglia') reports that 93.0% of microglia remained DsRed+ 30 days after tamoxifen, versus 7.9% of spleen cells and 1.7% of blood cells, and explains the difference by peripheral-cell turnover. But 'Generation of CX3CR1CreER mice' identifies the constitutive reporter as IRES-EYFP, not GFP; peripheral DsRed expression was low, not absent. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The majority of peripheral immune cells that express Cx3cr1 are short lived and turn over within 4 weeks because of ongoing, lifelong hematopoiesis.

    “However, the majority of these peripheral cells are short lived and turn over within 4 weeks because of ongoing, lifelong hematopoiesis.10–12”

    From A comparative analysis of microglial inducible Cre lines (2023) · cites this paper as [10]

    In Results, under “Cre-dependent manipulation of gene expression in microglia” (page not available), the paper says peripheral CX3CR1+ populations are replaced from bone-marrow precursors and reports that few blood and spleen cells retained the recombination marker 30 days after tamoxifen treatment. This supports rapid turnover, but the experiment used young mice and does not establish turnover within exactly four weeks or that the process continues throughout life. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • The YFP reporter line was used to verify two inducible Cx3cr1-CreERT2 lines (Jung et al., 2000; Parkhurst et al., 2013).

    “The YFP reporter line was used to verify two inducible Cx3cr1-CreERT2 lines (Jung et al., 2000; Parkhurst et al., 2013).”

    From Targeting Microglia Using Cx3cr1-Cre Lines: Revisiting the Specificity (2019) · cites this paper as Parkhurst et al., 2013

    The Results section, “Generation of CX3CR1CreER mice” (page not provided), describes one inducible line with a built-in EYFP element and uses EYFP to assess its expression. It does not say that a separate YFP reporter line verified two inducible lines; Cre activity was tested with a DsRed reporter instead. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Authors
Parkhurst, C. N., Yang, G., Ninan, I., Savas, J. N., Yates, J. R., Lafaille, J. J., Hempstead, B. L., Littman, D. R., & Gan, W.-B.
Affiliations
  • New York University (US)
  • NYU Langone Health (US)
  • Scripps Research Institute (US)
  • Weill Cornell Medicine (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Gan, Wen-Biao
Venue
Cell
Publisher
Elsevier BV
Published
2013-12
Volume
155
Issue
7
Pages
1596-1609
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2096500024
Cited by
2,599
References
57
Citations by year
2026: 148 · 2025: 202 · 2024: 252 · 2023: 230 · 2022: 276 · 2021: 264 · 2020: 297 · 2019: 204 · 2018: 208 · 2017: 175 · 2016: 145 · 2015: 112 · 2014: 78
FWCI
62.53
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Institutes of Health
  • National Institute on Aging (F32AG039127, P01AG031097)
  • National Institute of Mental Health (R01MH067880, R01MH096899, R01 MH96899, R56MH096899, F30MH096370)
  • National Institute of General Medical Sciences (P41GM103533)
  • National Institute of Neurological Disorders and Stroke (R01NS047325, NS030687, P01NS074972, R01NS030687, R01NS087198)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
microglia, brain-derived neurotrophic factor, synaptogenesis, learning and memory, motor learning, synaptic plasticity, microglial depletion, CX3CR1, diphtheria toxin receptor, neuroplasticity
MeSH terms
CX3C Chemokine Receptor 1, Animals, Learning, Neuronal Plasticity, Protein Kinases, Synapses, Signal Transduction, Gene Expression, Microglia, Brain-Derived Neurotrophic Factor, Receptors, Chemokine, Mice

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