Journal
CELL REPORTS
Volume 21, Issue 6, Pages 1600-1612Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2017.10.054
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Funding
- NIAID/NIH [R56 A1085063, U01 AI082185, R01 AI116813]
- KL2 Scholars grant [1KL2TR001444]
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Interferon-regulatory factors (IRFs) are a family of transcription factors (TFs) that translate viral recognition into antiviral responses, including type I interferon (IFN) production. Dengue virus (DENV) and other clinically important flaviviruses are suppressed by type I IFN. While mice lacking the type I IFN receptor (Ifnar1(-/-)) succumb to DENV infection, we found that mice deficient in three transcription factors controlling type I IFN production (Irf3(-/-) Irf5(-/-) Irf7(-/-) triple knockout [TKO]) survive DENV challenge. DENV infection of TKO mice resulted in minimal type I IFN production but a robust type II IFN (IFN-gamma) response. Using loss-of-function approaches for various molecules, we demonstrate that the IRF-3-, IRF-5-, IRF-7-independent pathway predominantly utilizes IFN-gamma and, to a lesser degree, type I IFNs. This pathway signals via IRF-1 to stimulate interleukin-12 (IL-12) production and IFN-gamma response. These results reveal a key antiviral role for IRF-1 by activating both type I and II IFN responses during DENV infection.
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