Coexpression of TIGIT and FCRL3 Identifies Helios+ Human Memory Regulatory T Cells

J Immunol. 2015 Apr 15;194(8):3687-96. doi: 10.4049/jimmunol.1401803. Epub 2015 Mar 11.

Abstract

Two distinct subsets of CD4(+)Foxp3(+) regulatory T (Treg) cells have been described based on the differential expression of Helios, a transcription factor of the Ikaros family. Efforts to understand the origin and biological roles of these Treg populations in regulating immune responses have, however, been hindered by the lack of reliable surface markers to distinguish and isolate them for subsequent functional studies. Using a single-cell cloning strategy coupled with microarray analysis of different Treg functional subsets in humans, we identify the mRNA and protein expression of TIGIT and FCRL3 as a novel surface marker combination that distinguishes Helios(+)FOXP3(+) from Helios(-)FOXP3(+) memory cells. Unlike conventional markers that are modulated on conventional T cells upon activation, we show that the TIGIT/FCRL3 combination allows reliable identification of Helios(+) Treg cells even in highly activated conditions in vitro as well as in PBMCs of autoimmune patients. We also demonstrate that the Helios(-)FOXP3(+) Treg subpopulation harbors a larger proportion of nonsuppressive clones compared with the Helios(+)FOXP3(+) cell subset, which is highly enriched for suppressive clones. Moreover, we find that Helios(-) cells are exclusively responsible for the productions of the inflammatory cytokines IFN-γ, IL-2, and IL-17 in FOXP3(+) cells ex vivo, highlighting important functional differences between Helios(+) and Helios(-) Treg cells. Thus, we identify novel surface markers for the consistent identification and isolation of Helios(+) and Helios(-) memory Treg cells in health and disease, and we further reveal functional differences between these two populations. These new markers should facilitate further elucidation of the functional roles of Helios-based Treg heterogeneity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Autoimmune Diseases / genetics
  • Autoimmune Diseases / immunology*
  • Autoimmune Diseases / pathology
  • Biomarkers
  • Cytokines / genetics
  • Cytokines / immunology
  • Female
  • Forkhead Transcription Factors / genetics
  • Forkhead Transcription Factors / immunology
  • Gene Expression Profiling
  • Gene Expression Regulation / immunology*
  • Humans
  • Ikaros Transcription Factor / genetics
  • Ikaros Transcription Factor / immunology
  • Immunologic Memory*
  • Male
  • Oligonucleotide Array Sequence Analysis
  • Receptors, Immunologic / genetics
  • Receptors, Immunologic / immunology*
  • T-Lymphocytes, Regulatory / immunology*
  • T-Lymphocytes, Regulatory / pathology

Substances

  • Biomarkers
  • Cytokines
  • FCRL3 protein, human
  • FOXP3 protein, human
  • Forkhead Transcription Factors
  • IKZF2 protein, human
  • Receptors, Immunologic
  • TIGIT protein, human
  • Ikaros Transcription Factor

Associated data

  • GEO/GSE65650