Classical MHC expression by DP thymocytes impairs the selection of non-classical MHC restricted innate-like T cells.
Hristo Georgiev, Changwei Peng, Matthew A Huggins, Stephen C Jameson, Kristin A Hogquist
Author Information
Hristo Georgiev: Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA. ORCID
Changwei Peng: Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA.
Matthew A Huggins: Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA.
Stephen C Jameson: Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA. ORCID
Kristin A Hogquist: Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN, 55455, USA. hogqu001@umn.edu. ORCID
Conventional T cells are selected by peptide-MHC expressed by cortical epithelial cells in the thymus, and not by cortical thymocytes themselves that do not express MHC I or MHC II. Instead, cortical thymocytes express non-peptide presenting MHC molecules like CD1d and MR1, and promote the selection of PLZF iNKT and MAIT cells, respectively. Here, we report an inducible class-I transactivator mouse that enables the expression of peptide presenting MHC I molecules in different cell types. We show that MHC I expression in DP thymocytes leads to expansion of peptide specific PLZF innate-like (PIL) T cells. Akin to iNKT cells, PIL T cells differentiate into three functional effector subsets in the thymus, and are dependent on SAP signaling. We demonstrate that PIL and NKT cells compete for a narrow niche, suggesting that the absence of peptide-MHC on DP thymocytes facilitates selection of non-peptide specific lymphocytes.
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