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2016 ; 12
(1
): e1005378
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Functional Interplay between Type I and II Interferons Is Essential to Limit
Influenza A Virus-Induced Tissue Inflammation
#MMPMID26731100
Stifter SA
; Bhattacharyya N
; Pillay R
; Flórido M
; Triccas JA
; Britton WJ
; Feng CG
PLoS Pathog
2016[Jan]; 12
(1
): e1005378
PMID26731100
show ga
Host control of influenza A virus (IAV) is associated with exuberant pulmonary
inflammation characterized by the influx of myeloid cells and production of
proinflammatory cytokines including interferons (IFNs). It is unclear, however,
how the immune system clears the virus without causing lethal immunopathology.
Here, we demonstrate that in addition to its known anti-viral activity, STAT1
signaling coordinates host inflammation during IAV infection in mice. This
regulatory mechanism is dependent on both type I IFN and IFN-? receptor signaling
and, importantly, requires the functional interplay between the two pathways. The
protective function of type I IFNs is associated with not only the recruitment of
classical inflammatory Ly6Chi monocytes into IAV-infected lungs, but also the
prevention of excessive monocyte activation by IFN-?. Unexpectedly, type I IFNs
preferentially regulate IFN-? signaling in Ly6Clo rather than inflammatory Ly6Chi
mononuclear cell populations. In the absence of type I IFN signaling, Ly6Clo
monocytes/macrophages, become phenotypically and functionally more
proinflammatory than Ly6Chi cells, revealing an unanticipated function of the
Ly6Clo mononuclear cell subset in tissue inflammation. In addition, we show that
type I IFNs employ distinct mechanisms to regulate monocyte and neutrophil
trafficking. Type I IFN signaling is necessary, but not sufficient, for
preventing neutrophil recruitment into the lungs of IAV-infected mice. Instead,
the cooperation of type I IFNs and lymphocyte-produced IFN-? is required to
regulate the tissue neutrophilic response to IAV. Our study demonstrates that IFN
interplay links innate and adaptive anti-viral immunity to orchestrate tissue
inflammation and reveals an additional level of complexity for IFN-dependent
regulatory mechanisms that function to prevent excessive immunopathology while
preserving anti-microbial functions.