[Genetic aspects of the action of immunosuppressive agents].

The data were obtained formerly that mice of certain strains essentially differ in the sensitivity to the immunodepressive and antiproliferative action of the alkylating agents (so-called opposite strains: DBA/2--highly sensitive, BALB/c--resistant). It is shown in the present work that with the use of the other non-alkylating immunodepressive agents (cytarabine, cyclosporin A, dexamethasone) that differ in the action mode, DBA/2 mice retain a high sensitivity whereas BALB/c mice a low sensitivity to all the immunodepressants. The sensitivity to the immunodepressive action in vivo directly correlates with that of the immunocompetent cells in vitro. Potential mechanisms determining the same type sensitivity to diverse immunodepressant in mice belonging to the above-indicated genotypes are under discussion.