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Related Experiment Video

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Characterizing Microglial Signaling Dynamics During Inflammation Using Single-Cell Mass Cytometry.

Sushanth Kumar1,2, August D Kahle1, Austin B Keeler1

  • 1Department of Biology, College of Arts and Sciences, University of Virginia, Charlottesville, Virginia, USA.

Glia
|January 9, 2025
PubMed
Summary

Single-cell mass cytometry reveals distinct microglial signaling responses to LPS and Poly(I:C). Astrocytes significantly dampen microglial activation, highlighting the importance of cellular context in neuroinflammation.

Keywords:
CyTOFNeuroinflammationastrocyteslipopolysaccharide (LPS)mass cytometrymicrogliapoly(I:C)signaling pathways

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglia are crucial for central nervous system (CNS) homeostasis but their inflammatory signaling profiles are not fully understood.
  • Traditional transcriptomics miss dynamic post-translational changes in microglial responses.
  • Understanding microglial plasticity is key for neuroinflammatory disease research.

Purpose of the Study:

  • To characterize dynamic microglial signaling pathways activated by bacterial (LPS) and viral (Poly(I:C)) mimetics using time-resolved single-cell mass cytometry (CyTOF).
  • To investigate the immunomodulatory effect of astrocytes on microglial signaling in mixed glial cultures.
  • To identify signaling modules and key markers of microglial activation and reactivity.

Main Methods:

  • Primary neonatal mouse microglia and mixed glial cultures were stimulated with LPS or Poly(I:C) for 48 hours.
  • Single-cell mass cytometry (CyTOF) was employed using a 33-antibody panel targeting signaling and identity markers.
  • High-dimensional clustering analysis was used to identify signaling modules and cellular responses.

Main Results:

  • Lipopolysaccharide (LPS) induced more robust early activation of p38 MAPK (pp38), ERK (pERK), RSK (pRSK), and CREB (pCREB) compared to Poly(I:C).
  • Both LPS and Poly(I:C) upregulated classical microglial reactivity markers CD40 and CD86 at later time points.
  • The presence of astrocytes significantly attenuated microglial responses to both LPS and Poly(I:C), notably reducing CD40 upregulation.

Conclusions:

  • Time-resolved single-cell mass cytometry is effective for capturing dynamic microglial signaling landscapes in response to inflammatory stimuli.
  • Microglial responses differ based on the type of inflammatory trigger, with distinct early signaling events.
  • Astrocyte presence significantly modulates microglial activation, emphasizing the importance of cellular context in neuroinflammation and therapeutic strategies.