title: Cutting edge: TCR revision occurs in germinal centers.
abstract: Mouse CD4(+)Vbeta5(+) T cells recognize a peripherally expressed superantigen encoded by an endogenous retrovirus. Ag encounter tolerizes the mature CD4 T cell compartment, either by deletion of autoreactive cells or by TCR revision. This latter process is driven by TCRbeta rearrangement through RAG activity and results in the rescue of cells expressing novel TCRs that no longer recognize the tolerogen. Consistent with the notion that revising T cells represent a distinct peripheral T cell population, we now show that these lymphocyte blasts express a hybrid effector/memory phenotype and are not undergoing cell division. A population of revising T cells is CD40(+), expresses the germinal center (GC) marker CXCR5, and is Vbeta5(low)Thy-1(low). Histology reveals that, consistent with their surface Ag phenotype, T cells undergoing TCR revision are enriched in splenic GCs. These data demonstrate that TCR revision is a multistep tolerance pathway supported by the unique microenvironment provided by GCs.
authors.affiliation: Department of Immunology, University of Washington, Seattle, WA 98195, USA.
authors.forename: Cristine J
authors.initials: CJ
authors.lastname: Cooper
authors.forename: Gail L
authors.initials: GL
authors.lastname: Turk
authors.forename: Mingyi
authors.initials: M
authors.lastname: Sun
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Farr
authors.forename: Pamela J
authors.initials: PJ
authors.lastname: Fink
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D002455:Cell Division / Q000235:genetics / Q000276:immunology; D004268:DNA-Binding Proteins / Q000235:genetics; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor / Q000235:genetics; D018858:Germinal Center / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000235:genetics; D007156:Immunologic Memory / Q000235:genetics; D016130:Immunophenotyping; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D017634:Self Tolerance / Q000235:genetics; D015398:Signal Transduction / Q000235:genetics / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D013934:Thymectomy
chemical_list: D015415:Biomarkers; D004268:DNA-Binding Proteins; C499308:Rag2 protein, mouse; D016693:Receptors, Antigen, T-Cell, alpha-beta; C064655:V(D)J recombination activating protein 2; D049452:Green Fluorescent Proteins