Type I Interferon Signalling and Ischemic Stroke: Mechanisms and Therapeutic Potentials

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Type I interferon (IFN-I) signaling is crucial in infectious, autoimmune, and neurological diseases.
• Acute ischemic stroke triggers overactivation of IFN-I signaling in the brain, especially in microglia.
• Self-nucleic acids like DNA and mtDNA act as alarm signals, activating IFN-I in microglia and promoting neuroinflammation.

Purpose of the Study:

• To review the roles of IFN-I signaling in cerebral ischemia.
• To elucidate molecular and cellular mechanisms of aberrant IFN-I activation post-stroke.
• To explore therapeutic potentials of IFN-I modulation for stroke treatment.

Main Methods:

• Review of existing literature on IFN-I signaling in ischemic stroke.
• Analysis of molecular pathways including DAMPs, mtDNA, and the cGAS-STING axis.
• Discussion of interferon-responsive microglia (IRM) in aged ischemic brains.

Main Results:

• IFN-I signaling is significantly implicated in stroke pathogenesis.
• Microglia are key players in IFN-I induction via DAMPs and the cGAS-STING pathway.
• Interferon-responsive microglia (IRM) are observed in ischemic brains, particularly in aged individuals.

Conclusions:

• Aberrant IFN-I signaling exacerbates neuroinflammation and secondary brain injury after stroke.
• The cGAS-STING pathway is integral to microglia-driven neuroinflammation.
• IFN-I-based therapies hold promise as immunomodulatory treatments for stroke, complementing thrombolysis.