Abstract: Mesenchymal stem cells (MSCs) have a unique role in immune regulation based on T-cells. On the mixed lymphocyte reactions, MSCs have inhibited T-cells proliferation by the effect of cycle arrest, but they do not cause the increase of T-cells apoptosis and the suppression of T-cells activation. In addition, MSCs can reduce CD8+ T cells and Th1 cells, and simultaneously increase Th2 cells in the reaction system to suppress the inflammatory response, which may play a therapeutic effect on the T-cells mediated autoimmune diseases.

Key words: Mesenchymal stem cells, T lymphocytes, Immunoregulation