A temporal thymic selection switch and ligand binding kinetics constrain neonatal Foxp3+Tregcell development.Stadinski, B.D., Blevins, S.J., Spidale, N.A., Duke, B.R., Huseby, P.G., Stern, L.J., Huseby, E.S.
(2019) Nat Immunol 20: 1046-1058
- PubMed: 31209405
- DOI: 10.1038/s41590-019-0414-1
- Primary Citation of Related Structures:
6MKR, 6MKD, 6MNO, 6MNG, 6MNN, 6MNM
- PubMed Abstract:
The neonatal thymus generates Foxp3 + regulatory T (tT reg ) cells that are critical in controlling immune homeostasis and preventing multiorgan autoimmunity. The role of antigen specificity on neonatal tT reg cell selection is unresolved ...
The neonatal thymus generates Foxp3 + regulatory T (tT reg ) cells that are critical in controlling immune homeostasis and preventing multiorgan autoimmunity. The role of antigen specificity on neonatal tT reg cell selection is unresolved. Here we identify 17 self-peptides recognized by neonatal tT reg cells, and reveal ligand specificity patterns that include self-antigens presented in an age- and inflammation-dependent manner. Fate-mapping studies of neonatal peptidyl arginine deiminase type IV (Padi4)-specific thymocytes reveal disparate fate choices. Neonatal thymocytes expressing T cell receptors that engage IA b -Padi4 with moderate dwell times within a conventional docking orientation are exported as tT reg cells. In contrast, Padi4-specific T cell receptors with short dwell times are expressed on CD4 + T cells, while long dwell times induce negative selection. Temporally, Padi4-specific thymocytes are subject to a developmental stage-specific change in negative selection, which precludes tT reg cell development. Thus, a temporal switch in negative selection and ligand binding kinetics constrains the neonatal tT reg selection window.
Department of Pathology, University of Massachusetts Medical School, Worcester, MA, USA. Eric.Huseby@umassmed.edu.