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2015 ; 212
(10
): 1513-28
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Epithelial-intrinsic IKK? expression regulates group 3 innate lymphoid cell
responses and antibacterial immunity
#MMPMID26371187
Giacomin PR
; Moy RH
; Noti M
; Osborne LC
; Siracusa MC
; Alenghat T
; Liu B
; McCorkell KA
; Troy AE
; Rak GD
; Hu Y
; May MJ
; Ma HL
; Fouser LA
; Sonnenberg GF
; Artis D
J Exp Med
2015[Sep]; 212
(10
): 1513-28
PMID26371187
show ga
Innate lymphoid cells (ILCs) are critical for maintaining epithelial barrier
integrity at mucosal surfaces; however, the tissue-specific factors that regulate
ILC responses remain poorly characterized. Using mice with intestinal epithelial
cell (IEC)-specific deletions in either inhibitor of ?B kinase (IKK)? or IKK?,
two critical regulators of NF?B activation, we demonstrate that IEC-intrinsic
IKK? expression selectively regulates group 3 ILC (ILC3)-dependent antibacterial
immunity in the intestine. Although IKK?(?IEC) mice efficiently controlled
Citrobacter rodentium infection, IKK?(?IEC) mice exhibited severe intestinal
inflammation, increased bacterial dissemination to peripheral organs, and
increased host mortality. Consistent with weakened innate immunity to C.
rodentium, IKK?(?IEC) mice displayed impaired IL-22 production by ROR?t(+) ILC3s,
and therapeutic delivery of rIL-22 or transfer of sort-purified IL-22-competent
ILCs from control mice could protect IKK?(?IEC) mice from C. rodentium-induced
morbidity. Defective ILC3 responses in IKK?(?IEC) mice were associated with
overproduction of thymic stromal lymphopoietin (TSLP) by IECs, which negatively
regulated IL-22 production by ILC3s and impaired innate immunity to C. rodentium.
IEC-intrinsic IKK? expression was similarly critical for regulation of intestinal
inflammation after chemically induced intestinal damage and colitis.
Collectively, these data identify a previously unrecognized role for epithelial
cell-intrinsic IKK? expression and TSLP in regulating ILC3 responses required to
maintain intestinal barrier immunity.