Expanding role of T-cell costimulators in regulatory T-cell function: Recent advances in accessory molecules expressed on both regulatory and nonregulatory T cells

Lishomwa C. Ndhlovu, Ikuo Takeda, Kazuo Sugamura, Naoto Ishii

Research output: Contribution to journalReview articlepeer-review

27 Citations (Scopus)

Abstract

A subpopulation of T cells harbors a suppressor phenotype and can significantly dampen autoreactive CD4+ and CD8+ T-cell responses. These regulatory T (Treg) cells, which can arise naturally in the thymus and encompass a CD25+CD4+ T-cell repertoire or be antigenically induced, are central players in the maintenance of self-tolerance. A plethora of T-cell costimulatory and accessory receptor molecules expressed by Treg and/or non-regulatory T cells, such as GITR, OX40, and CTLA-4, are involved in modulating the pathogenesis of numerous autoimmune disorders, transplant rejection, and tumor immunity, as well as the control of infections. Exciting new evidence shows that T-cell costimulators, some of which are identified as hopeful discriminative Treg-cell markers, appear to mediate Treg-cell homeostasis and function. Understanding the biological significance of the T-cell costimulatory molecules and the accessory molecules expressed by Treg cells is a prerequisite to better characterizing this regulatory T-cell population. We provide a synopsis of the current understanding of several costimulatory molecules that can orchestrate the function of both naturally arising and antigen-inducible Treg cells.

Original languageEnglish
Pages (from-to)251-266
Number of pages16
JournalCritical Reviews in Immunology
Volume24
Issue number4
DOIs
Publication statusPublished - 2004

Keywords

  • CD28 family
  • TNF
  • TNFR

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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