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2014 ; 193
(8
): 4203-13
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TLR2-dependent activation of ?-catenin pathway in dendritic cells induces
regulatory responses and attenuates autoimmune inflammation
#MMPMID25210120
Manoharan I
; Hong Y
; Suryawanshi A
; Angus-Hill ML
; Sun Z
; Mellor AL
; Munn DH
; Manicassamy S
J Immunol
2014[Oct]; 193
(8
): 4203-13
PMID25210120
show ga
Dendritic cells (DCs) sense microbes via multiple innate receptors. Signals from
different innate receptors are coordinated and integrated by DCs to generate
specific innate and adaptive immune responses against pathogens. Previously, we
have shown that two pathogen recognition receptors, TLR2 and dectin-1, which
recognize the same microbial stimulus (zymosan) on DCs, induce mutually
antagonistic regulatory or inflammatory responses, respectively. How diametric
signals from these two receptors are coordinated in DCs to regulate or incite
immunity is not known. In this study, we show that TLR2 signaling via AKT
activates the ?-catenin/T cell factor 4 pathway in DCs and programs them to drive
T regulatory cell differentiation. Activation of ?-catenin/T cell factor 4 was
critical to induce regulatory molecules IL-10 (Il-10) and vitamin A metabolizing
enzyme retinaldehyde dehydrogenase 2 (Aldh1a2) and to suppress proinflammatory
cytokines. Deletion of ?-catenin in DCs programmed them to drive Th17/Th1 cell
differentiation in response to zymosan. Consistent with these findings,
activation of the ?-catenin pathway in DCs suppressed chronic inflammation and
protected mice from Th17/Th1-mediated autoimmune neuroinflammation. Thus,
activation of ?-catenin in DCs via the TLR2 receptor is a novel mechanism in DCs
that regulates autoimmune inflammation.