Abstract
Homeostatic control of T cells involves tight regulation of effector T cells to prevent excessive activation that can cause tissue damage and autoimmunity. Little is known, however, about whether antigen-presenting cells (APCs) are also involved in maintaining immune system homeostasis once effector T cells are stimulated. Here we found that immature APCs downregulated effector T cell function by a mechanism involving the C-type lectin MGL expressed by APCs. Glycosylation-dependent interactions of MGL with CD45 on effector T cells negatively regulated T cell receptor–mediated signaling and T cell–dependent cytokine responses, which in turn decreased T cell proliferation and increased T cell death. Thus, regulation of effector T cells by MGL expressed on APCs may provide a target for regulating chronic inflammatory and autoimmune diseases.
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Acknowledgements
We thank R. van Lier and A. Weiss for discussions; F. Sánchez-Madrid for reagents; R. Mebius for critical review of the manuscript; E. van Liempt for assistance; and T. van der Pouw Kraan and T. Timmer for rheumatoid arthritis tissues. Supported by the Netherlands Organization for Health Research and Development (900-02-002 to S.J.v.V. and Y.v.K.) and Dutch Asthma Foundation 3.2.03.39 (T.B.H.G. and S.I.G.).
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S.J.v.V. designed and did all the experiments and prepared the manuscript; S.I.G. designed experiments; T.B.H.G. and Y.v.K. provided overall supervision, designed experiments and prepared the manuscript.
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Supplementary information
Supplementary Fig. 1
CD45 is a counterreceptor for MGL on lymphocytes. (PDF 178 kb)
Supplementary Fig. 2
MGL binding reduces TNF production by CD4+ and CD8+ T cells. (PDF 176 kb)
Supplementary Fig. 3
Model of MGL mediated control of effector T cell homeostasis. (PDF 251 kb)
Supplementary Table 1
MGL expression on cultured APCs. (PDF 93 kb)
Supplementary Table 2
Characterization of MGLpos APCs in skin and lymph node. (PDF 88 kb)
Supplementary Table 3
MGL-Fc recognition of hematopoietic cell lines. (PDF 54 kb)
Supplementary Table 4
Expression of co-stimulatory molecules on cultured APCs. (PDF 60 kb)
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van Vliet, S., Gringhuis, S., Geijtenbeek, T. et al. Regulation of effector T cells by antigen-presenting cells via interaction of the C-type lectin MGL with CD45. Nat Immunol 7, 1200–1208 (2006). https://doi.org/10.1038/ni1390
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DOI: https://doi.org/10.1038/ni1390
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