JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Overlap between molecular markers expressed by naturally occurring CD4+CD25+ regulatory T cells and antigen specific CD4+CD25+ and CD8+CD28- T suppressor cells.

Human Immunology 2004 November
Alloantigen specific CD8+CD28- T suppressor (TS) cells differ from naturally occurring CD4+CD25+ T-regulatory (natural TR) cells not only by their phenotype but also by their mechanism of action. Natural TR have been extensively studied, leading to the identification of characteristic "molecular markers" such as Forkhead box P3 (FOXP3), glucocorticoid-induced tumor necrosis factor receptor-related protein (GITR) and cytotoxic T lymphocyte-associated antigen 4 (CTLA-4). We have investigated the expression of these genes in alloantigen specific TS and CD4+CD25+ T regulatory (TR) cells and found that they are expressed at levels similar to those observed in natural TR. Furthermore, similar to natural CD4+CD25+ TR, antigen-specific CD8+CD28-CD62L+ TS cells have more suppressive capacity than CD8+CD28-CD62L- TS cells. In spite of these similarities, natural TR are not antigen-specific and inhibit other T cells by T cell-to-T cell interaction, whereas TS are antigen-specific and exert their inhibitory function by interacting with antigen-presenting cells and render them tolerogenic to other T cells. The molecular characterization of TS cells may contribute to a better understanding of mechanisms involved in inhibition of immune responses in autoimmunity, transplantation, and chronic viral infection.

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