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Significant differences in cellular responses were found among allograft recipients treated with various OKT4A mAb protocols. Recipients of multiple infusion low-dose and 2-bolus OKT4A immunosuppressive regimens regularly showed potent donor-specific cytotoxic CD8+ and CD4+ intragraft T cells and donor-reactive PBMC in MLC tests. In contrast, PBMC isolated from recipients of high-dose OKT4A therapy generally showed very weak or no response to donor-antigens during the later posttransplant periods. Furthermore, an absence of IL2-responsive intragraft cells was found to correlate with stable graft function in these recipients. We conclude that OKT4A mAb, in high doses, can block allosensitization and induce donor-specific nonresponsiveness in vivo. An OKT4A-based therapy, therefore, may have the potential of inducing long-lasting donor-specific immunosuppression, or even tolerance.
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