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Inflammatory Bowel Diseases:
doi: 10.1097/MIB.0000000000000105
Original Basic Research Articles

Cross-talk Between RORγt+ Innate Lymphoid Cells and Intestinal Macrophages Induces Mucosal IL-22 Production in Crohn's Disease

Mizuno, Shinta MD, PhD*; Mikami, Yohei MD, PhD*,†; Kamada, Nobuhiko PhD; Handa, Tango MPharm*; Hayashi, Atsushi MPharm*; Sato, Toshiro MD, PhD*; Matsuoka, Katsuyoshi MD, PhD*; Matano, Mami MAgr*; Ohta, Yuki BSc§; Sugita, Akira MD; Koganei, Kazutaka MD; Sahara, Rikisaburo MD; Takazoe, Masakazu MD; Hisamatsu, Tadakazu MD, PhD*; Kanai, Takanori MD, PhD*

Supplemental Author Material
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Abstract

Background:

Interleukin (IL)-22–producing RORγt+ innate lymphoid cells (ILCs) play a pivotal role in intestinal immunity. Recent reports demonstrated that ILCs contribute to mucosal protection and intestinal inflammation in mice. In humans, numbers of RORγt+ ILCs are significantly increased in the intestine of patients with Crohn's disease (CD), suggesting that ILCs may be associated with intestinal inflammation in CD. However, the mechanism by which ILCs are regulated in the intestine of patients with CD is poorly understood. This study aimed to determine the activation mechanism of intestinal ILCs in patients with CD.

Methods:

CD45+ lineage marker- ILCs were isolated from intestinal lamina propria of patients with CD. ILCs were then subdivided into 4 distinct populations based on the expression of CD56 and CD127. Purified ILC subsets were cocultured with intestinal CD14+ macrophages, and IL-22 production was evaluated.

Results:

CD127+CD56 and CD127+CD56+ ILC, but not CD127CD56+ or CD127CD56 ILC, subsets expressed RORγt and produced IL-22. IL-22 production by these ILC subsets was enhanced when ILCs were cocultured with intestinal macrophages. IL-23 or cell-to-cell contact was required for macrophage-mediated activation of ILCs. IL-22 production by ILCs was perturbed in inflamed mucosa compared with noninflamed mucosa. IL-22 induced the expression of Reg1α and Claudin-1 in human intestinal epithelial organoids.

Conclusions:

RORγt+ ILCs might enhance mucosal barrier function through the upregulation of Reg1α through production of IL-22. Although CD14+ macrophages augment intestinal inflammation in patients with CD, macrophages also promote a negative feedback pathway through the activation of IL-22 production by RORγt+ ILCs.

Copyright © 2014 Crohn's & Colitis Foundation of America, Inc.

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