RESUMEN
To investigate the mechanism of inducing a prolongation of allograft survival by immunizing the syngeneic mouse with activated murine spleen cells,we used an anti—activated mouse Tlymphocyte antigen monoclonal antibody(2H_3)made in our laboratory to examine the effect of 2H3on allograft survival in vivo and on cell—mediated immune rection in vitro.The results showed that 2H3 could significantly prolong the allograft survival in vivo and obviously inhibit the proliferation in MLR and CTL generation in bulk MLR as well as the T lymphocyte prolifer-ation to ConA in vitro.These data indicate that one of the mechanisms of the prolongation of al-lograft survival by immunizing the syngeneic mouse with activated murine spleencells may be due to the generation of an anti—activated mouse lymphocyte antigen antibodies in immunized ani-mals which can block process of allorection.