Abstract
Human group 1 ILCs consist of at least three phenotypically distinct subsets, including NK cells, CD127(+) ILC1, and intraepithelial CD103(+) ILC1. In inflamed intestinal tissues from Crohn's disease patients, numbers of CD127(+) ILC1 increased at the cost of ILC3. Here we found that differentiation of ILC3 to CD127(+) ILC1 is reversible in vitro and in vivo. CD127(+) ILC1 differentiated to ILC3 in the presence of interleukin-2 (IL-2), IL-23, and IL-1β dependent on the transcription factor RORγt, and this process was enhanced in the presence of retinoic acid. Furthermore, we observed in resection specimen from Crohn's disease patients a higher proportion of CD14(+) dendritic cells (DC), which in vitro promoted polarization from ILC3 to CD127(+) ILC1. In contrast, CD14(-) DCs promoted differentiation from CD127(+) ILC1 toward ILC3. These observations suggest that environmental cues determine the composition, function, and phenotype of CD127(+) ILC1 and ILC3 in the gut.
Copyright © 2015 Elsevier Inc. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Cell Differentiation / immunology
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Cells, Cultured
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Crohn Disease / immunology
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Dendritic Cells / immunology
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Humans
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Interleukin-12 Subunit p35 / immunology*
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Interleukin-1beta / immunology
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Interleukin-2 / immunology
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Interleukin-23 Subunit p19 / immunology*
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Interleukin-7 Receptor alpha Subunit / immunology*
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Intestinal Mucosa / cytology
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Intestinal Mucosa / immunology*
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Killer Cells, Natural / immunology
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Lipopolysaccharide Receptors / immunology
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Lymphocyte Transfusion
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Lymphocytes / immunology*
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Mice
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Mice, Inbred C57BL
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Mice, Inbred NOD
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Mice, Knockout
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Mice, SCID
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Nuclear Receptor Subfamily 1, Group F, Member 3 / immunology
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Receptors, Retinoic Acid / metabolism
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Retinoic Acid Receptor alpha
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Retinoic Acid Receptor gamma
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Retinoid X Receptor gamma / metabolism
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Tretinoin / pharmacology
Substances
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IL12A protein, human
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IL1B protein, human
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IL2 protein, human
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IL23A protein, human
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Interleukin-12 Subunit p35
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Interleukin-1beta
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Interleukin-2
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Interleukin-23 Subunit p19
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Interleukin-7 Receptor alpha Subunit
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Lipopolysaccharide Receptors
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Nuclear Receptor Subfamily 1, Group F, Member 3
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RARA protein, human
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RORC protein, human
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Rara protein, mouse
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Receptors, Retinoic Acid
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Retinoic Acid Receptor alpha
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Retinoid X Receptor gamma
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Tretinoin