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An emerging role for microglia in stress‐effects on memory

European Journal of Neuroscience, vol. 55, pp. 2491–2518

Abstract

Stressful experiences evoke, among others, a rapid increase in brain (nor)epinephrine (NE) levels and a slower increase in glucocorticoid hormones (GCs) in the brain. Microglia are key regulators of neuronal function and contain receptors for NE and GCs. These brain cells may therefore potentially be involved in modulating stress effects on neuronal function and learning and memory. In this review, we discuss that stress induces (1) an increase in microglial numbers as well as (2) a shift toward a pro-inflammatory profile. These microglia have (3) impaired crosstalk with neurons and (4) disrupted glutamate signaling. Moreover, microglial immune responses after stress (5) alter the kynurenine pathway through metabolites that impair glutamatergic transmission. All these effects could be involved in the impairments in memory and in synaptic plasticity caused by (prolonged) stress, implicating microglia as a potential novel target in stress-related memory impairments.

Authors 9

  1. University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

  2. Leiden University Medical Center

    Affiliation as printed

    Department of Medicine Division of Endocrinology Leiden University Medical Center Leiden The Netherlands

    Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands

  3. University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

  4. University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

  5. University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

  6. University Medical Center Groningen · University of Groningen

    Affiliation as printed

    Department of Biomedical Sciences of Cells & Systems Section Molecular Neurobiology University of Groningen University Medical Center Groningen Groningen The Netherlands

    Department of Biomedical Sciences of Cells & Systems, Section Molecular Neurobiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

  7. Hospital for Sick Children · University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Program in Neurosciences and Mental Health Hospital for Sick Children Toronto ON Canada

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

    Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, ON, Canada

  8. Leiden University Medical Center

    Affiliation as printed

    Department of Medicine Division of Endocrinology Leiden University Medical Center Leiden The Netherlands

    Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands

  9. Harm J. Krugers corresponding

    University of Amsterdam

    Affiliation as printed

    Brain Plasticity Group SILS‐CNS University of Amsterdam Amsterdam The Netherlands

    Brain Plasticity Group, SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands

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References 299