THE EFFECTS OF 6-MERCAPTOPURINE ON HOMOGRAFT REACTIONS *

Abstract
The mean rejection time of skin grafts in rabbits was 6.8 days. When rabbits were treated with 6-mercaptopurine, 12 mg/kilo/day, the mean rejection time was 17.8 days. Intermediate doses also prolonged the retention of the homografts. No effect of 6-mercaptopurine treatment was found on the 2d set homograft reaction. These studies indicate that 6-mercaptopurine not only suppresses antibody formation to purified antigens, but also to homografts.