Human CD4(+)CD25(+) thymocytes and peripheral T cells have immune suppressive activity in vitro - PubMed (original) (raw)
Human CD4(+)CD25(+) thymocytes and peripheral T cells have immune suppressive activity in vitro
L A Stephens et al. Eur J Immunol. 2001 Apr.
Free article
Abstract
CD4(+)CD25(+) T cells in mice and rats are capable of transferring protection against organ-specific autoimmune disease and colitis and suppressing the proliferation of other T cells after polyclonal stimulation in vitro. Here we describe the existence in humans of CD4(+)CD25(+) T cells with the same in vitro characteristics. CD4(+)CD8(-)CD25(+) T cells are present in both the thymus and peripheral blood of humans ( approximately 10 % of CD4(+)CD8(-) T cells), proliferate poorly in response to mitogenic stimulation and suppress the proliferation of CD4(+)CD25(-) cells in co-culture. This suppression requires cell contact and can be overcome by the addition of exogenous IL-2. CD4(+)CD25(+) cells from thymus and blood were poor producers of IL-2 and IFN-gamma, and suppressed the levels of these cytokines produced by CD4(+)CD25(-) cells. However, CD4(+)CD25(+) PBL produced higher levels of IL-4 and similar amounts of IL-10 as CD4(+)CD25(-) cells. Regulatory CD4(+)CD25(+) T cells have an activated phenotype in the thymus with expression of CTLA-4 and CD122 (IL-2Rbeta). The fact that CD4(+)CD25(+) regulatory T cells are present with a similar frequency in the thymus of humans, rats and mice, suggests that the role of these cells in the maintenance of immunological tolerance is an evolutionarily conserved mechanism.
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