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The in vitro immunosuppressive effect of deoxymethylspergualin in man as compared with FK506 and cyclosporine.

The effect of deoxymethylspergualin (MeDSG) on in vitro human lymphocyte response was assessed in comparison with FK506 and cyclosporine. Peripheral blood mononuclear cells from normal human volunteers were used for assay of mixed lymphocyte reaction, cell mediated lympholysis, and blastogenesis by PHA, IL-2, and OKT3. MeDSG suppressed only allogeneic stimulation (MLR and CML) and IL-2-induced blastogenesis, not PHA- or OKT3-induced blastogenesis, although the other immunosuppressive agents showed some suppressive effect for all assays. A kinetic study of MLR showed that the suppressive activity did not decrease even when MeDSG was added at day 3 or day 4. The other agents, however, showed a weak suppressive effect when added at a later phase of MLR.