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2015 ; 212
(6
): 845-53
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IFN-? resolves inflammation via suppression of neutrophil infiltration and IL-1?
production
#MMPMID25941255
Blazek K
; Eames HL
; Weiss M
; Byrne AJ
; Perocheau D
; Pease JE
; Doyle S
; McCann F
; Williams RO
; Udalova IA
J Exp Med
2015[Jun]; 212
(6
): 845-53
PMID25941255
show ga
The most studied biological role of type III interferons (IFNs) has so far been
their antiviral activity, but their role in autoimmune and inflammatory diseases
remains largely unexplored. Here, we show that treatment with IFN-?2/IL-28A
completely halts and reverses the development of collagen-induced arthritis (CIA)
and discover cellular and molecular mechanisms of IL-28A antiinflammatory
function. We demonstrate that treatment with IL-28A dramatically reduces numbers
of proinflammatory IL-17-producing Th17 and ?? T cells in the joints and inguinal
lymph nodes, without affecting T cell proliferative responses or levels of
anticollagen antibodies. IL-28A exerts its antiinflammatory effect by restricting
recruitment of IL-1b-expressing neutrophils, which are important for
amplification of inflammation. We identify neutrophils as cells expressing high
levels of IFN-? receptor 1 (IFNLR1)-IL-28 receptor ? (IL28RA) and targeted by
IL-28A. Our data highlight neutrophils as contributors to the pathogenesis of
autoimmune arthritis and present IFN-?s or agonists of IFNLR1-IL28RA as putative
new therapeutics for neutrophil-driven inflammation.