Foxp3-dependent and -independent molecules specific for CD25+CD4+ natural regulatory T cells revealed by DNA microarray analysis

N Sugimoto, T Oida, K Hirota, K Nakamura… - International …, 2006 - academic.oup.com
N Sugimoto, T Oida, K Hirota, K Nakamura, T Nomura, T Uchiyama, S Sakaguchi
International immunology, 2006academic.oup.com
Abstract Naturally occurring CD25+ CD4+ regulatory T cells (Tregs) actively engage in the
maintenance of immunologic self-tolerance and immunoregulation. They specifically
express the transcription factor Forkhead box P3 (Foxp3) as a master control molecule for
their development and function. Although several cell-surface molecules have been
reported as Treg-specific markers, such as CD25, glucocorticoid-induced TNFR family-
related gene/protein and CTL-associated molecule-4, they are also expressed on activated …
Abstract
Naturally occurring CD25+CD4+ regulatory T cells (Tregs) actively engage in the maintenance of immunologic self-tolerance and immunoregulation. They specifically express the transcription factor Forkhead box P3 (Foxp3) as a master control molecule for their development and function. Although several cell-surface molecules have been reported as Treg-specific markers, such as CD25, glucocorticoid-induced TNFR family-related gene/protein and CTL-associated molecule-4, they are also expressed on activated T cells derived from CD25CD4+ naive T cells. To identify Treg-specific molecules controlled by Foxp3, we performed DNA microarray analysis by comparing the following pairs of cell populations: fresh CD25+CD4+ T cells versus fresh CD25CD4+ T cells, activated CD25+CD4+ T cells versus activated CD25CD4+ T cells and retrovirally Foxp3-transduced CD25CD4+ T cells versus mock-transduced CD25CD4+ T cells. We found that the Gpr83, Ecm1, Cmtm7, Nkg7, Socs2 and glutaredoxin genes are predominantly transcribed in fresh and activated natural Treg as well as in Foxp3-transduced cells, while insulin-like 7, galectin-1, granzyme B and helios genes are natural Treg specific but Foxp3 independent. G protein-coupled receptor 83 (Gpr83) expression on the cell surface of natural Treg was confirmed by staining with Gpr83-specific antibody. Retroviral transduction of either group of genes in CD25CD4+ T cells failed to confer in vitro suppressive activity. Thus, there are several genes that are expressed in a highly Treg-specific fashion. Some of these genes are controlled by Foxp3, and others are not. These genes, in particular, Gpr83, Ecm1 and Helios, could potentially be used as specific markers for natural Treg.
Oxford University Press