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Microglia have a more extensive and divergent response to interferon-α compared with astrocytes

Wen Li1, Barney Viengkhou1,2, Gareth Denyer2

  • 1The University of Sydney, School of Molecular Bioscience, the Marie Bashir Institute for Infectious Diseases and Biosecurity, the Charles Perkins Centre, and the Bosch Institute, Sydney, Australia.

Glia
|July 28, 2018
PubMed

Insights

Type I interferons (IFN-I) are vital for brain defense but can cause neurological disease. Microglia show a broader response to IFN-I than astrocytes, suggesting specialized roles in immunity and disease.

Area of Science:

  • Neuroscience
  • Immunology
  • Genetics

Background:

  • Type I interferons (IFN-I) are critical for central nervous system (CNS) antimicrobial defense.
  • IFN-I can also cause neurological damage, leading to conditions like Aicardi-Goutières Syndrome.
  • Microglia and astrocytes are key CNS immune cells that respond to IFN-I, but their differential responses are not well understood.

Purpose of the Study:

  • To investigate the global transcriptional responses of astrocytes and microglia to IFN-I, specifically IFN-α.
  • To compare the gene expression patterns of these two cell types under basal and stimulated conditions.

Main Methods:

  • Global transcriptional profiling of astrocytes and microglia.
  • Stimulation with IFN-α.
  • Comparative analysis of gene expression data.
  • Validation in a murine model of cerebral interferonopathy.

Main Results:

  • Both astrocytes and microglia exhibit unique basal gene expression profiles.
  • IFN-α stimulation induced a common core response in both cell types, enhancing pathogen defense genes.
  • Microglia displayed a significantly more extensive and diverse transcriptional response to IFN-α compared to astrocytes, with more upregulated and downregulated genes.
  • Findings were validated in a mouse model of cerebral interferonopathy.

Conclusions:

  • Astrocytes and microglia have both overlapping and distinct responses to Type I interferons.
  • Microglia exhibit a more robust and varied response to IFN-α, indicating specialized functions in CNS immunity.
  • These divergent responses suggest distinct roles for microglia and astrocytes in host defense and the pathogenesis of cerebral interferonopathies.
Keywords:
astrocytecerebral interferonopathiesinterferon-alphamicroarraymicroglia

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