ABSTRACT
Objective:To study the inhibited function of CTLA4 Ig on T cell activation and its mechanism Methods:After separating fresh PBMC,the effects of CTLA4 Ig on T lymphocyte transformation and mixed lymphocyte reaction were analyzed,and its inhibitory effect on the CD25 expression on T cell surface was observed At last,the changes of the nuclear protein in active T cell were analyzed by the EMSA method.Results:CTLA4 Ig has an inhibitory effect on the lymphocyte transformation,MLR and CD25 expression on T cell surface,and it can inhibite the activation of RE/AP binding factor related to IL 2 expression. Conclusion:CTLA4 Ig inhibit the activation of T cell by multipathway,one of the mechanism might be its inhibitory effect on the activation of RE/AP binding factor.