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Akkaya B, Oya Y, Akkaya M, Al Souz J, Holstein AH, Kamenyeva O, Kabat J, Matsumura R, Dorward DW, Glass DD, Shevach EM. Regulatory T cells mediate specific suppression by depleting peptide-MHC class II from dendritic cells. Nat Immunol 2019; 20:218-231. [PMID: 30643268 PMCID: PMC6402611 DOI: 10.1038/s41590-018-0280-2] [Citation(s) in RCA: 168] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 11/08/2018] [Indexed: 01/22/2023]
Abstract
T regulatory cells (Tregs) can activate multiple suppressive mechanisms in vitro upon activation via the T cell receptor resulting in antigen-independent suppression. However, it remains unclear whether similar pathways operate in vivo. Here, we found that antigen-specific Tregs activated by dendritic cells (DCs) pulsed with two antigens suppressed Tnaive specific for both cognate and non-cognate antigens in vitro, but only suppressed Tnaive specific for cognate antigen in vivo. Antigen-specific Tregs formed strong interactions with DC resulting in selective inhibition of the binding of Tnaive to cognate antigen, yet allowing bystander Tnaive access. Strong binding resulted in removal of the cognate peptide-MHCII (pMHCII) from the DC surface reducing the capacity of the DC to present antigen. The enhanced binding of Tregs to DC coupled with their capacity to deplete pMHCII represents a novel pathway for Treg-mediated suppression and may be a mechanism by which Tregs maintain immune homeostasis.
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Affiliation(s)
- Billur Akkaya
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
| | - Yoshihiro Oya
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.,Department of Rheumatology, Allergy & Clinical Immunology, National Hospital Organization Chiba-East National Hospital, Chiba, Japan
| | - Munir Akkaya
- Laboratory of Immunogenetics National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD, USA
| | - Jafar Al Souz
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Amanda H Holstein
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.,University of South Florida Morsani College of Medicine, Tampa, FL, USA
| | - Olena Kamenyeva
- Research Technologies Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Juraj Kabat
- Research Technologies Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ryutaro Matsumura
- Department of Rheumatology, Allergy & Clinical Immunology, National Hospital Organization Chiba-East National Hospital, Chiba, Japan
| | - David W Dorward
- Research Technologies Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rocky Mountain Labs, Hamilton, MT, USA
| | - Deborah D Glass
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.,Rapa Therapeutics, Rockville, MD, USA
| | - Ethan M Shevach
- Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
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