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Several aspects of adoptive transfer of tumor immunity were studied in the line 10 hepatocarcinoma in the syngeneic Sewall-Wright strain 2 guinea pig. In particular, the need for cooperation between donor and recipient T-cells was investigated. Donor immune spleen cells remained immunologically capable of inducing tumor rejection for at least 160 days after adoptive transfer. Irradiated (1,000 rad) or mitomycin-treated immune spleen cells lacked tumor-rejection activity, which is indicative of the necessity for in vivo proliferation after adoptive transfer of immunity. Furthermore, adoptive transfer of tumor immunity was abrogated after treatment of the line 10 immune spleen cells with rabbit anti-guinea pig-thymocyte serum (ATS) plus complement. The role of recipient T-cells was investigated in strain 2 guinea pigs which were T-cell depleted by thymectomy, irradiation, and bone marrow reconstitution (T-XBM animals). Severe suppression of T-cell activity was present at 2 and 6 weeks after irradiation and bone marrow reconstitution. At 10 weeks nonspecific T-cell activity was partially restored. The induction of antigen-specific responses, measured by delayed-type hypersensitivity skin testing in vivo and antigenic stimulation in vitro, was suppressed at 2 weeks after irradiation and bone marrow reconstitution. Additional in vivo treatment of T-XBM animals with a rabbit ATS improved the T-cell depletion only moderately. Tumor growth and tumor rejection after adoptive transfer of immunity were equal in normal and T-cell-deprived recipient animals, thus indicating that recipient T-cells are not needed for tumor rejection after adoptive transfer of line 10 tumor immunity.(ABSTRACT TRUNCATED AT 250 WORDS)
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