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Immunol Cell Biol. 2015 Oct;93(9):771-9. doi: 10.1038/icb.2015.77. Epub 2015 Aug 25.

TLR3 drives IRF6-dependent IL-23p19 expression and p19/EBI3 heterodimer formation in keratinocytes.

Author information

1
Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia.
2
IMB Centre for Inflammation and Disease Research, and Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia.
3
Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia.
4
Centre for Immunology, Burnet Institute, Melbourne, Victoria, Australia.
5
Department of Medicine, Royal Melbourne Hospital, The University of Melbourne, Parkville, Victoria, Australia.
6
Dermatology Research Centre, The University of Queensland, School of Medicine, Translational Research Institute, Brisbane, Queensland, Australia.
7
Melbourne Dental School and Oral Health Cooperative Research Centre, The University of Melbourne, Parkville, Victoria, Australia.
8
Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia.

Abstract

Interferon regulatory factor (IRF) family members impart cell-type specificity to toll-like receptor (TLR) signalling, and we recently identified a role for IRF6 in TLR2 signalling in epithelial cells. TLR3 has a well-characterized role in wound healing in the skin, and here, we examined TLR3-dependent IRF6 functions in human keratinocytes. Primary keratinocytes responded robustly to the TLR3 agonist poly(IC) with upregulation of mRNAs for interferon-β (IFN-β), the interleukin-12 (IL-12) family member IL-23p19 and the chemokines IL-8 and chemokine (C-C motif) ligand 5 (CCL5). Silencing of IRF6 expression enhanced poly(IC)-inducible IFN-β mRNA levels and inhibited poly(IC)-inducible IL-23p19 mRNA expression in primary keratinocytes. Consistent with these data, co-transfection of IRF6 increased poly(IC)-inducible IL-23p19 promoter activity, but inhibited poly(IC)-inducible IFN-β promoter activity in reporter assays. Surprisingly, poly(IC) did not regulate IL-12p40 expression in keratinocytes, suggesting that TLR3-inducible IL-23p19 may have an IL-23-independent function in these cells. The only other IL-12 family member that was strongly poly(IC) inducible was EBI3, which has not been shown to heterodimerize with IL-23p19. Both co-immunoprecipitation and proximity ligation assays revealed that IL-23p19 and EBI3 interact in cells. Co-expression of IL-23p19 and EBI3, as compared with IL-23p19 alone, resulted in increased levels of secreted IL-23p19, implying a functional role for this heterodimer. In summary, we report that IRF6 regulates a subset of TLR3 responses in human keratinocytes, including the production of a novel IL-12 family heterodimer (p19/EBI3). We propose that the TLR3-IRF6-p19/EBI3 axis may regulate keratinocyte and/or immune cell functions in the context of cell damage and wound healing in the skin.

PMID:
26303210
DOI:
10.1038/icb.2015.77
[Indexed for MEDLINE]

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