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Systems Analysis of the Neuroinflammatory and Hemodynamic Response to Traumatic Brain Injury
Published on: May 27, 2022
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Interferon-β Deficiency Selectively Modulates Chronic Microglial Pathways after Traumatic Brain Injury
James P Barrett1, Rebecca J Henry1,2, Maria Vaida3
1Department of Anesthesiology and Shock, Trauma and Anesthesiology Research (STAR) Center, University of Maryland School of Medicine, Baltimore, Maryland, USA.
Journal of Neurotrauma
|March 31, 2026
Summary
Global interferon-beta (IFN-β) deficiency in mice after traumatic brain injury (TBI) improves cognitive function but suppresses beneficial homeostatic microglia long-term. This suggests complex, time-dependent effects on chronic TBI outcomes.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Traumatic brain injury (TBI) triggers secondary injury cascades, leading to chronic neurodegeneration and functional deficits.
- Type I interferon (IFN-I) signaling, particularly interferon-beta (IFN-β), is acutely upregulated post-TBI and contributes to neuroinflammation.
- Early inhibition of IFN-β signaling shows protective effects, but long-term consequences remain unstudied.
Purpose of the Study:
- To investigate the long-term effects of global IFN-β deficiency on microglial activation, neuropathology, and neurological function in a mouse model of TBI.
- To determine the impact of sustained IFN-β suppression on chronic neuroinflammatory gene expression in microglia post-TBI.
- To assess the influence of IFN-β deficiency on lesion volume, motor deficits, and cognitive impairment at chronic timepoints (60-90 days postinjury).
Main Methods:
- Controlled cortical impact model of TBI in wild-type and global IFN-β knockout (IFN-β-/-) mice.
- Transcriptomic analysis of isolated microglia at 60 and 90 days postinjury (dpi).
- Assessment of lesion volume, fine motor function, and cognitive performance.
Main Results:
- Persistent upregulation of IFN-I and pro-inflammatory/disease-associated microglia (DAM) markers was observed in wild-type mice at 60 and 90 dpi.
- IFN-I pathway was attenuated in IFN-β-/- mice, but DAM marker upregulation was unaffected.
- IFN-β deficiency attenuated pro-inflammatory phenotypes at 60 dpi but enhanced homeostatic gene downregulation at 90 dpi.
- No significant reduction in lesion volume or motor deficits was found in IFN-β-/- mice, but chronic cognitive impairment was attenuated.
Conclusions:
- Global IFN-β deficiency has complex, time-dependent effects on chronic TBI outcomes.
- While IFN-β deficiency improves cognitive function post-TBI, it also suppresses homeostatic microglia, potentially limiting long-term therapeutic benefits.
- Targeting IFN-β signaling requires careful consideration of its dual role in acute inflammation and chronic microglial homeostasis.
