Cited by 214Neuroinflammation and Neurodegeneration MechanismsNeuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanisms

Nanoscale Surveillance of the Brain by Microglia via cAMP-Regulated Filopodia

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Bernier, Louis-Philippe, Bohlen, Christopher J., York, Elisa M., Choi, Hyun B., Kamyabi, Alireza, Dissing-Olesen, Lasse, Hefendehl, Jasmin K., Collins, Hannah Y. +3 more·2019·Cell Reports

Abstract

Microglia, the brain's immune cells, maintain homeostasis and sense pathological changes by continuously surveying the parenchyma with highly motile large processes. Here, we demonstrate that microglia also use thin actin-dependent filopodia that allow fast nanoscale sensing within discrete regions. Filopodia are distinct from large processes by their size, speed, and regulation mechanism. Increasing cyclic AMP (cAMP) by activating norepinephrine G s -coupled receptors, applying nitric oxide, or inhibiting phosphodiesterases rapidly increases filopodia but collapses large processes. Alternatively, G i -coupled P2Y12 receptor activation collapses filopodia but triggers large processes extension with bulbous tips. Similar control of cytoskeletal dynamics and microglial morphology by cAMP is observed in ramified primary microglia, suggesting that filopodia are intrinsically generated sensing structures. Therefore, nanoscale surveillance of brain parenchyma by microglia requires localized cAMP increases that drive filopodia formation. Shifting intracellular cAMP levels controls the polarity of microglial responses to changes in brain homeostasis and alters the scale of immunosurveillance.

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Crossref · 10.1016/j.celrep.2019.05.010

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Authors
Bernier, L.-P., Bohlen, C. J., York, E. M., Choi, H. B., Kamyabi, A., Dissing-Olesen, L., Hefendehl, J. K., Collins, H. Y., Stevens, B., Barres, B. A., & MacVicar, B. A.
Affiliations
  • University of British Columbia (CA)
  • Stanford Medicine (US)
  • Boston Children's Hospital (US)
Corresponding author
  • Bernier, Louis-Philippe
  • MacVicar, Brian A.
Venue
Cell Reports
Publisher
Elsevier BV
Published
2019-06
Volume
27
Issue
10
Pages
2895-2908.e4
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2948343247
Cited by
211
References
83
Citations by year
2026: 15 · 2025: 26 · 2024: 29 · 2023: 39 · 2022: 27 · 2021: 36 · 2020: 31 · 2019: 7 · 2013: 1
FWCI
11.46
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Fondation Leducq
  • Canadian Institutes of Health Research (FDN-148397)
  • Fonds de Recherche du Québec - Santé
  • Heart and Stroke Foundation of Canada
  • Michael Smith Foundation for Health Research
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, filopodia, cyclic AMP, microglial surveillance, brain parenchyma, actin cytoskeleton dynamics, nitric oxide, phosphodiesterase inhibition, P2Y12 receptor, microglial morphology, immune surveillance, microglial motility
MeSH terms
Actins, Cyclic AMP, Adenosine Triphosphate, Animals, Brain, Female, Male, Mice, Inbred BALB C, Mice, Inbred C57BL, Microtubules, Pseudopodia, Signal Transduction, Rats, Sprague-Dawley, Microglia, Potassium Channels, Tandem Pore Domain, Mice, Rats, Cyclic Nucleotide Phosphodiesterases, Type 3

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