[Mechanism of CD4+CD25+ and CD8+ regulatory T cells--review].

Regulatory T cells (Treg) play a key role in the negative regulation of the immune system, which can inhibit inappropriate self-reactive T cells, as well as limit the range, extent and lasting time of immune responses, so as to inhibit the proliferation of CD4(+) and CD8(+) effector T cells. In view of these properties, there is little doubt about the enormous potential value of Tregs in molecular mechanisms and clinical treatment of human autoimmune disorders, graft-versus-host disease (GVHD) and allergies. In this review, the molecular mechanisms of CD4(+)CD25(+) Treg and CD8(+) Treg were mainly discussed, and challenge with which study on Treg cells is faced and prospects were briefly described.