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2015 ; 5
(ä): 10536
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The Wnt5a-Ror2 axis promotes the signaling circuit between interleukin-12 and
interferon-? in colitis
#MMPMID26030277
Sato A
; Kayama H
; Shojima K
; Matsumoto S
; Koyama H
; Minami Y
; Nojima S
; Morii E
; Honda H
; Takeda K
; Kikuchi A
Sci Rep
2015[Jun]; 5
(ä): 10536
PMID26030277
show ga
Wnt5a, which regulates various cellular functions in Wnt signaling, is involved
in inflammatory responses, however the mechanism is not well understood. We
examined the role of Wnt5a signaling in intestinal immunity using conditional
knockout mice for Wnt5a and its receptor Ror2. Removing Wnt5a or Ror2 in adult
mice suppressed dextran sodium sulfate (DSS)-induced colitis. It also attenuated
the DSS-dependent increase in inflammatory cytokine production and decreased
interferon-? (IFN-?)-producing CD4(+) Th1 cell numbers in the colon. Wnt5a was
highly expressed in stromal fibroblasts in ulcerative lesions in the DSS-treated
mice and inflammatory bowel disease patients. Dendritic cells (DCs) isolated from
the colon of Wnt5a and Ror2 deficient mice reduced the ability to differentiate
naïve CD4(+) T cells to IFN-?-producing CD4(+) Th1 cells. In vitro experiments
demonstrated that the Wnt5a-Ror2 signaling axis augmented the DCs priming effect
of IFN-?, leading to enhanced lipopolysaccharide (LPS)-induced interleukin
(IL)-12 expression. Taken together, these results suggest that Wnt5a promotes
IFN-? signaling, leading to IL-12 expression in DCs, and thereby inducing Th1
differentiation in colitis.