Cited by 1,127Neuroinflammation and Neurodegeneration MechanismsNeurological Disease Mechanisms and TreatmentsInflammasome and immune disorders

Microglial priming in neurodegenerative disease

Perry, V. Hugh, Holmes, Clive·2014·Nature Reviews Neurology

Abstract

Under physiological conditions, the number and function of microglia--the resident macrophages of the CNS--is tightly controlled by the local microenvironment. In response to neurodegeneration and the accumulation of abnormally folded proteins, however, microglia multiply and adopt an activated state--a process referred to as priming. Studies using preclinical animal models have shown that priming of microglia is driven by changes in their microenvironment and the release of molecules that drive their proliferation. Priming makes the microglia susceptible to a secondary inflammatory stimulus, which can then trigger an exaggerated inflammatory response. The secondary stimulus can arise within the CNS, but in elderly individuals, the secondary stimulus most commonly arises from a systemic disease with an inflammatory component. The concept of microglial priming, and the subsequent exaggerated response of these cells to secondary systemic inflammation, opens the way to treat neurodegenerative diseases by targeting systemic disease or interrupting the signalling pathways that mediate the CNS response to systemic inflammation. Both lifestyle changes and pharmacological therapies could, therefore, provide efficient means to slow down or halt neurodegeneration.

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Crossref · 10.1038/nrneurol.2014.38

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  • Excessive inflammatory response occurs in many neurodegenerative disorders such as Parkinson's (PD) and Alzheimer's diseases (AD).

    “This excessive inflammatory response occurs in many neurodegenerative disorders such as Parkinson's (PD) and Alzheimer's diseases (AD) (Ransohoff, 2016),(Perry and Holmes, 2014),(Burguillos et al., 2011),(Abeliovich and Gitler, 2016), as well as in neurological conditions such as ischemic stroke (Lambertsen et al., 2012),(Burguillos et al., 2015).”

    From TET2 Regulates the Neuroinflammatory Response in Microglia (2019) · cites this paper as Perry and Holmes, 2014

  • The cause of microglial priming is unclear and likely results from multiple factors, including loss of inhibitory ligand-receptor communication with aging neurons, interactions with age-related misfolded proteins such as Aβ, age-related exposure to increasing transforming growth factor-β, age-related alterations in production of IL-4 and CCL11 in the choroid plexus, and unique microenvironmental 3

    “The cause of microglial priming is unclear and likely results from multiple factors, including but not limited to (1) a loss of inhibitory ligand–receptor communication with aging neurons (94), (2) interactions with age-related misfolded proteins such as Aβ which promote pro-inflammatory cytokine production (95), (3) age-related exposure to increasing transforming growth factor-β which could”
  • The primed state is thought to make aged microglia disproportionately reactive to immunological challenges, leading to prolonged neuroinflammation and cognitive deficits associated with age.

    “This state of ‘priming’ is thought to make aged microglia disproportionately reactive to immunological challenges, leading to prolonged neuroinflammation and the cognitive deficits associated with age [65,66].”
  • With aging, microglia take on a 'primed' phenotype, which is characterized by an exaggerated and uncontrolled inflammatory response to an immune stimulus.

    “With aging, microglia take on a 'primed' phenotype, which is characterized by an exaggerated and uncontrolled inflammatory response to an immune stimulus (Perry and Holmes, 2014).”

    From Microglia Priming with Aging and Stress (2017) · cites this paper as Perry and Holmes, 2014

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Authors
Perry, V. H., & Holmes, C.
Affiliations
University of Southampton (GB)
Corresponding author
Perry, V. Hugh
Venue
Nature Reviews Neurology
Published
2014-03-18
Volume
10
Issue
4
Pages
217-224
ISSN
  • 1759-4758 (ISSN-L)
  • 1759-4766
OpenAlex
W2059996790
Cited by
1,127
References
121
Citations by year
2026: 106 · 2025: 93 · 2024: 86 · 2023: 69 · 2022: 88 · 2021: 97 · 2020: 104 · 2019: 90 · 2018: 119 · 2017: 106 · 2016: 86 · 2015: 65 · 2014: 18
FWCI
7.45
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Reviews Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • ePrints Soton (University of Southampton) (submittedVersion)
Funders
  • Wellcome Trust
  • National Academy of Sciences of Ukraine
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
microglial priming, neurodegeneration, microglial activation, secondary inflammation, systemic inflammation, diabetes mellitus, microglial proliferation, neuroinflammation, neurodegenerative disease treatment, lifestyle intervention
MeSH terms
Alzheimer Disease, Animals, Anti-Inflammatory Agents, Brain, Central Nervous System Diseases, Humans, Inflammation, Macrophage Activation, Microglia, Neurodegenerative Diseases

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