Abstract
Thymic natural killer T (NKT)2 cells are a subset of invariant NKT cells with PLZFhiGATA3hiIL-4+. The differentiation of NKT2 cells is not fully understood. In the present study, we report an important role of TRAF3-interacting protein 3 (TRAF3IP3) in the functional maturation and expansion of committed NKT2s in thymic medulla. Mice with T-cell-specific deletion of TRAF3IP3 had decreased thymic NKT2 cells, decreased IL-4-producing peripheral iNKTs, and defects in response to α-galactosylceramide. Positive selection and high PLZF expression in CD24+CD44− and CCR7+CD44− immature iNKTs were not affected. Only CD44hiNK1.1− iNKTs in Traf3ip3−/− mice showed reduced expression of Egr2, PLZF, and IL-17RB, decreased proliferation, and reduced IL-4 production upon stimulation. This Egr2 and IL-4 expression was augmented by MEK1/ERK activation in iNKTs, and TRAF3IP3 at the trans-Golgi network recruited MEK1 and facilitated ERK phosphorylation and nuclear translocation. LTβR-regulated bone marrow-derived nonlymphoid cells in the medullary thymic microenvironment were required for MEK/ERK activation and NKT2 maturation. These data demonstrate an important functional maturation process in NKT2 differentiation that is regulated by MEK/ERK signaling at the trans-Golgi network.
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Acknowledgements
We thank Lilin Ye (Army Medical University, China) for kindly providing the Cd4-Cre transgenic mice and Li Bai (University of Science and Technology of China, China) for the DN32.D3 cell line. We also thank Professors Yu Zhang, Jun Zhang, Wenling Han (Peking University Health Science Center, China), and Li Wu (Tsinghua University) for critical comments, helpful discussions, and critical reagents. α-GalCer and unloaded and PBS57-loaded CD1d tetramers conjugated with phycoerythrin or allophycocyanin were supplied by the National Institutes of Health Tetramer Core Facility. This work was supported by grants from the National Key Research and Development Program of China (2017YFA0104500), the National Natural Science Foundation of China (81471525, 31671244, 31872734, Q.G., 31872824, H.Z.), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (81621001), and the Non-Profit Central Research Institute Fund of Chinese Academy of Medical Sciences, 2018PT31039.
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Q.G., X.Z. and H.Z. designed the research, analyzed the data, and wrote the paper. X.Z. performed the research. Y.W., S.Z. and M.L. performed the research. L.C. J.H., R.J., X.S., X.H. and M.Z. contributed reagents and technical support. H.W. helped with flow cytometry. H.Z. edited the manuscript. All authors reviewed the manuscript.
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Zhang, X., Wang, K., Zhao, W. et al. TRAF3IP3 at the trans-Golgi network regulates NKT2 maturation via the MEK/ERK signaling pathway. Cell Mol Immunol 17, 395–406 (2020). https://doi.org/10.1038/s41423-019-0234-0
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DOI: https://doi.org/10.1038/s41423-019-0234-0
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