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2017 ; 114
(38
): 10190-10195
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Treg-specific IL-27R? deletion uncovers a key role for IL-27 in Treg function to
control autoimmunity
#MMPMID28874534
Do J
; Kim D
; Kim S
; Valentin-Torres A
; Dvorina N
; Jang E
; Nagarajavel V
; DeSilva TM
; Li X
; Ting AH
; Vignali DAA
; Stohlman SA
; Baldwin WM 3rd
; Min B
Proc Natl Acad Sci U S A
2017[Sep]; 114
(38
): 10190-10195
PMID28874534
show ga
Dysregulated Foxp3(+) Treg functions result in uncontrolled immune activation and
autoimmunity. Therefore, identifying cellular factors modulating Treg functions
is an area of great importance. Here, using Treg-specific Il27ra(-/-) mice, we
report that IL-27 signaling in Foxp3(+) Tregs is essential for Tregs to control
autoimmune inflammation in the central nervous system (CNS). Following
experimental autoimmune encephalomyelitis (EAE) induction, Treg-specific
Il27ra(-/-) mice develop more severe EAE. Consistent with the severe disease, the
numbers of IFN?- and IL-17-producing CD4 T cells infiltrating the CNS tissues are
greater in these mice. Treg accumulation in the inflamed CNS tissues is not
affected by the lack of IL-27 signaling in Tregs, suggesting a functional defect
of Il27ra(-/-) Tregs. IL-10 production by conventional CD4 T cells and their CNS
accumulation are rather elevated in Treg-specific Il27ra(-/-) mice. Analysis with
Treg fate-mapping reporter mice further demonstrates that IL-27 signaling in
Tregs may control stability of Foxp3 expression. Finally, systemic administration
of recombinant IL-27 in Treg-specific Il27ra(-/-) mice fails to ameliorate the
disease even in the presence of IL-27-responsive conventional CD4 T cells. These
findings uncover a previously unknown role of IL-27 in regulating Treg function
to control autoimmune inflammation.