Epithelial-intrinsic IKKα expression regulates group 3 innate lymphoid cell responses and antibacterial immunity

Giacomin, Paul R.; Moy, Ryan H.; Noti, Mario; Osborne, Lisa C.; Siracusa, Mark C.; Alenghat, Theresa; Liu, Bigang; McCorkell, Kelly A.; Troy, Amy E.; Rak, Gregory D.; Hu, Yinling; May, Michael J.; Ma, Hak-Ling; Fouser, Lynette A.; Sonnenberg, Gregory F.; Artis, David (2015). Epithelial-intrinsic IKKα expression regulates group 3 innate lymphoid cell responses and antibacterial immunity. The Journal of experimental medicine, 212(10), pp. 1513-1528. Rockefeller Univ. Press 10.1084/jem.20141831

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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 κB kinase (IKK)α or IKKβ, two critical regulators of NFκB activation, we demonstrate that IEC-intrinsic IKKα expression selectively regulates group 3 ILC (ILC3)-dependent antibacterial immunity in the intestine. Although IKKβ(ΔIEC) mice efficiently controlled Citrobacter rodentium infection, IKKα(ΔIEC) mice exhibited severe intestinal inflammation, increased bacterial dissemination to peripheral organs, and increased host mortality. Consistent with weakened innate immunity to C. rodentium, IKKα(ΔIEC) mice displayed impaired IL-22 production by RORγt(+) ILC3s, and therapeutic delivery of rIL-22 or transfer of sort-purified IL-22-competent ILCs from control mice could protect IKKα(ΔIEC) mice from C. rodentium-induced morbidity. Defective ILC3 responses in IKKα(ΔIEC) 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 IKKα 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 IKKα expression and TSLP in regulating ILC3 responses required to maintain intestinal barrier immunity.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology > Immunopathology

UniBE Contributor:

Noti, Mario

ISSN:

1540-9538

Publisher:

Rockefeller Univ. Press

Language:

English

Submitter:

Doris Haefelin

Date Deposited:

07 Dec 2015 12:18

Last Modified:

21 Mar 2016 02:30

Publisher DOI:

10.1084/jem.20141831

PubMed ID:

26371187

BORIS DOI:

10.7892/boris.73737

URI:

https://boris.unibe.ch/id/eprint/73737

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