Abstract

SUMMARY The inhibition tests of leukocyte migration and of target cell destruction have been compared for their sensitivity for the detection of transplantation antigens. The migration inhibition test was performed with spleen cells of C57BL/6J animals which had been immunized with Sal cells of the A strain. Inhibition of target cell destruction was carried out with rabbit antisera, using guinea pig complement and 51Cr-labeled target lymphocytes; the inhibitory antigen was the crude membrane-lipoprotein preparation isolated from the spleens and lymph nodes of normal A/J animals. Significant inhibition of leukocyte migration was obtained with the antigen preparation at a concentration of 100 µg/ml or higher. The inhibition of target cell lysis depended on the cytotoxic titer of the antiserum; at 71 and 56% cytotoxic titers, complete inhibitions were obtained with 100 and 25 /µg of antigen, while 50% inhibitions were obtained with 70 and 14 /µg of antigen, respectively.

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