A recently developed pharmacologic means for suppressing acquired immunity by drugs acting on neuroendocrine regulation has been applied to transplantation immune reactions. A number of drugs have been tested singly and in combination for their capacity to suppress the immune response of mice grafted with allogeneic skin. Another model involved newborn F1 hybrid recipients inoculated with spleen cells from donors of parental strains that had been made specifically “unresponsive” by drug and alloantigen treatment. These procedures led to the identification of a combination of four drugs that induced a remarkable delay in allograft rejection and a prolonged unresponsiveness to alloantigens. This combination of drugs also abrogated the graft-vs-host-runting syndrome in newborn hybrid recipients.

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