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2016 ; 18
(1
): 268
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Interleukin 37 limits monosodium urate crystal-induced innate immune responses in
human and murine models of gout
#MMPMID27863506
Liu L
; Xue Y
; Zhu Y
; Xuan D
; Yang X
; Liang M
; Wang J
; Zhu X
; Zhang J
; Zou H
Arthritis Res Ther
2016[Nov]; 18
(1
): 268
PMID27863506
show ga
BACKGROUND: Interleukin (IL)-37 has emerged as a fundamental inhibitor of innate
immunity. Acute gout is a self-limiting inflammatory response to monosodium urate
(MSU) crystals. In the current study, we assessed the preventive and therapeutic
effect of recombinant human IL-37 (rhIL-37) in human and murine gout models.
METHODS: We investigated the expression of IL-37 in patients with active and
inactive gouty arthritis and assessed the effect of rhIL-37 in human and murine
gout models: a human monocyte cell line (THP-1) and human synovial cells
(containing macrophage-like and fibroblast-like synoviocytes) exposed to MSU
crystals, a peritoneal murine model of gout and a murine gouty arthritis model.
After inhibition of Mer receptor tyrosine kinase (Mertk), levels of IL-1?, IL-8
and chemokine (C-C motif) ligand 2 (CCL-2) were detected by ELISA and expression
of mammalian homologs of the drosophila Mad gene 3 (Smad), suppressor of cytokine
signaling 3 (SOCS3), NACHT-LRR-PYD-containing protein 3 (NLRP3), and IL-8R of
THP-1 were assessed by qPCR and western blot to explore the molecular mechanisms.
RESULTS: Our studies strongly indicated that rhIL-37 played a potent
immunosuppressive role in the pathogenesis of experimental gout models both in
vitro and in vivo, by downregulating proinflammatory cytokines and chemokines,
markedly reducing neutrophil and monocyte recruitment, and mitigating
pathological joint inflammation. In our studies, rhIL-37 suppressed MSU-induced
innate immune responses by enhancing expression of Smad3 and IL-1R8 to trigger
multiple intracellular switches to block inflammation, including inhibition of
NLRP3 and activation of SOCS3. Mertk signaling participated in rhIL-37 inhibitory
pathways in gout models. By inhibition of Mertk, the anti-inflammatory effect of
rhIL-37 was partly abrogated, and IL-1R8, Smad3 and S?OCS3 expression were
suppressed, whereas NLRP3 expression was reactivated. CONCLUSIONS: Our studies
reveal that IL-37 limits runaway inflammation initiated by MSU crystal-induced
immune responses, partly in a Mertk-dependent fashion. Thus, rhIL-37 has both
preventive and therapeutic effects in gouty arthritis.