Niche-specific MHC II and PD-L1 regulate CD4+CD8αα+ intraepithelial lymphocyte differentiation

Conventional CD4+ T cells are differentiated into CD4+CD8αα+ intraepithelial lymphocytes (IELs) in the intestine; however, the roles of intestinal epithelial cells (IECs) are poorly understood. Here, we showed that IECs expressed MHC class II (MHC II) and programmed death-ligand 1 (PD-L1) induced by...

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Published in:The Journal of experimental medicine 2021-04, Vol.218 (4)
Main Authors: Moon, Sookjin, Park, Yunji, Hyeon, Sumin, Kim, Young-Min, Kim, Ji-Hae, Kim, Hyekang, Park, Subin, Lee, Kun-Joo, Koo, Bon-Kyoung, Ha, Sang-Jun, Lee, Seung-Woo
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Brief Definitive Report
Mucosal Immunology
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container_issue 4
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container_title The Journal of experimental medicine
container_volume 218
creator Moon, Sookjin
Park, Yunji
Hyeon, Sumin
Kim, Young-Min
Kim, Ji-Hae
Kim, Hyekang
Park, Subin
Lee, Kun-Joo
Koo, Bon-Kyoung
Ha, Sang-Jun
Lee, Seung-Woo
description Conventional CD4+ T cells are differentiated into CD4+CD8αα+ intraepithelial lymphocytes (IELs) in the intestine; however, the roles of intestinal epithelial cells (IECs) are poorly understood. Here, we showed that IECs expressed MHC class II (MHC II) and programmed death-ligand 1 (PD-L1) induced by the microbiota and IFN-γ in the distal part of the small intestine, where CD4+ T cells were transformed into CD4+CD8αα+ IELs. Therefore, IEC-specific deletion of MHC II and PD-L1 hindered the development of CD4+CD8αα+ IELs. Intracellularly, PD-1 signals supported the acquisition of CD8αα by down-regulating the CD4-lineage transcription factor, T helper-inducing POZ/Krüppel-like factor (ThPOK), via the Src homology 2 domain-containing tyrosine phosphatase (SHP) pathway. Our results demonstrate that noncanonical antigen presentation with cosignals from IECs constitutes niche adaptation signals to develop tissue-resident CD4+CD8αα+ IELs.
doi_str_mv 10.1084/jem.20201665
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Mucosal Immunology
title Niche-specific MHC II and PD-L1 regulate CD4+CD8αα+ intraepithelial lymphocyte differentiation
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