Abstract
Interferon regulatory factor 3 (IRF3) is a transcription factor critical in the induction of antiviral immunity. IRF3 is activated following stimulation of cell membrane or cytosolic nucleic acid sensors and is essential in the induction of the IFNβ gene. Most cells constitutively express IRF3 in vitro, but little is known about the regulation of expression of IRF3 in vivo. Immunohistochemical analysis of selected human and mouse tissues demonstrated that IRF3 expression is highly organ- and cell-type specific, showing high expression in certain epithelial cells. In the CNS, while ependymal cells are strongly positive, brain parenchyma has little detectable IRF3 immunoreactivity. The importance of IRF3 in antiviral immunity has been demonstrated by the requirement for IRF3 in suppressing viral replication, but also by the demonstration that virus degrades IRF3 protein in infected cells. Furthermore, HIV-infected microglia in human CNS show abnormal IRF3+ aggregates, indicative of aberrant protein processing in vivo. In addition to antiviral immunity, IRF3 also plays a critical role in the modulation of neuroinflammation. A combination of dominant-negative and over-expression strategies in vitro as well as transgenic expression of IRF3 in vivo demonstrated that IRF3 plays a major role in modulating glial cytokine expression, i.e., suppression of proinflammatory cytokines and promotion of anti-inflammatory or immunoregulatory cytokines. These observations together suggest that IRF3 is a crucial regulator of immune responses against pathogen- and damage-associated molecules. We review recent literature on the molecular pathways of IRF3 activation and function of IRF3 and discuss their implications for CNS diseases.
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Abbreviations
- Ad-IRF3:
-
Adenovirus-IRF3
- AIM2:
-
Absent in melanoma 2
- ASC:
-
Apoptosis-associated speck-like protein containing CARD
- CXCL1:
-
CXC chemokine ligand 1 aka GROα
- CXCL10:
-
CXC chemokine ligand 10 aka IP-10
- DAMPs:
-
Damage-associated molecular patterns
- DAI:
-
DNA-dependent activator of IRFs
- DN-IRF3:
-
Dominant negative IRF3
- FFPE:
-
Formalin-fixed paraffin-embedded
- GFAP:
-
Glial fibrillary acidic protein
- GFP:
-
Green fluorescence protein
- i.c.:
-
Intracerebral
- IFI16:
-
Interferon-inducible protein 16
- IFIT1:
-
Interferon-induced protein with tetratricopeptide repeats 1
- IFNλ:
-
Interferon lambda (type III interferon)
- IKKi:
-
IκBα kinase inducible aka IKKε
- IL-1:
-
Interleukin 1
- IL-1R:
-
IL-1 receptor
- IL-1ra:
-
IL-1 receptor antagonist
- iNOS:
-
Inducible nitric oxide synthase
- IPS-1:
-
Interferon promoter stimulator-1
- IRF3:
-
Interferon regulatory factor 3
- MyD88:
-
Myeloid differentiation primary response gene 88
- ISGs:
-
IFN-stimulated genes
- ISRE:
-
IFN-stimulated response element
- LPS:
-
Lipopolysaccharide
- M1:
-
Macrophages classical activation phenotype
- M2:
-
Macrophage alternative activation phenotype
- MDA-5:
-
Melanoma differentiation-associated gene 5
- MGC:
-
Multinucleated giant cell
- NOD:
-
Nuclear oligomerization domain
- NLR:
-
NOD-like receptor
- NLRP3:
-
Nucleotide-binding domain and leucine-rich repeat-containing 3 aka NALP3
- PAMPs:
-
Pathogen-associated molecular patterns
- PBDA:
-
Porphobilinogen deaminase
- PBS:
-
Phosphate saline buffer
- PRR:
-
Pattern recognition receptor
- PTEN:
-
Phosphatase and tensin homologue
- Q-PCR:
-
Real-time reverse transcription PCR
- RIG-I:
-
Retinoic acid-induced gene I
- RLR:
-
RIG-I-like receptor
- SOCS1:
-
Suppressor of cytokine signaling 1
- STING:
-
Stimulator of interferon gene
- TBK1:
-
TANK-binding kinase 1
- TLR:
-
Toll-like receptors
- TNFα:
-
Tumor necrosis factor α
- TRAF:
-
Tumor necrosis factor receptor-associated factor
- TREX 1:
-
Three prime repair exonuclease 1
- TRIF:
-
TIR domain-containing adaptor inducing IFNβ
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Acknowledgement
The authors thank current and former colleagues at Einstein, Drs Brad Poulos, Ken Chen, Meng-Liang Zhao, Melissa Cosenza-Nashat, Namjong Choi, Mark Rivieccio, Olivier Loudig, Bridget Shafit-Zagardo, Laura Santambrogio and Celia F. Brosnan for their intellectual and technical contributions. The authors are especially grateful to Dr John Hiscott at McGill University, Montreal CA, who has provided plasmids and helpful discussions over the years. Dr Susan Morgello, Director of the Manhattan HIV Brain Bank (NNTC), also provided some of the brain sections used in this study. This study was supported by NIH RO1 MH55477, T32 NS007098, NIH KO1 MH084705, and P30 AI051519.
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The authors declare no competing interests.
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Tarassishin, L., Bauman, A., Suh, HS. et al. Anti-Viral and Anti-Inflammatory Mechanisms of the Innate Immune Transcription Factor Interferon Regulatory Factor 3: Relevance to Human CNS Diseases. J Neuroimmune Pharmacol 8, 132–144 (2013). https://doi.org/10.1007/s11481-012-9360-5
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DOI: https://doi.org/10.1007/s11481-012-9360-5