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2015 ; 6
(ä): 6131
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IL-10 engages macrophages to shift Th17 cytokine dependency and pathogenicity
during T-cell-mediated colitis
#MMPMID25607885
Li B
; Gurung P
; Malireddi RK
; Vogel P
; Kanneganti TD
; Geiger TL
Nat Commun
2015[Jan]; 6
(ä): 6131
PMID25607885
show ga
Polymorphisms attenuating IL-10 signalling confer genetic risk for inflammatory
bowel disease. Yet, how IL-10 prevents mucosal autoinflammation is incompletely
understood. We demonstrate using lineage-specific deletions of IL-10R? that IL-10
acts primarily through macrophages to limit colitis. Colitis depends on IL-6 to
support pathologic Th17 cell generation in wild-type mice. However, specific
ablation of macrophage IL-10R? provokes excessive IL-1? production that overrides
Th17 IL-6 dependency, amplifying the colonic Th17 response and disease severity.
IL-10 not only inhibits pro-IL-1? production transcriptionally in macrophages,
but suppresses caspase-1 activation and caspase-1-dependent maturation of
pro-IL-1? to IL-1?. Therefore, lineage-specific effects of IL-10 skew the
cytokine dependency of Th17 cell development required for colitis pathogenesis.
Coordinated interventions may be needed to fully suppress Th17-mediated
immunopathology.