Abstract：
:Enhancement of specific transplantation resistance to a syngeneic tumor (KMT-17) was observed in WKA rats by treatment with the antileukemia drug busulfan (BU) (15 mg/kg) 5 days before and 5 days after immunization with X-irradiated KMT-17 tumor cells. Rats immunized with X-irradiated KMT-17 cells and then treated with BU showed specific transplantation resistance only against KMT-17 tumor. Carrageenan administration after BU treatment had no effect on enhancement by BU, which indicated that macrophages were not playing a major role in the observed enhancement. With the Winn assay, it was found that spleen cells from rats immunized with X-irradiated tumor cells followed by BU inhibited the growth of admixed tumor cells more strongly than did spleen cells from rats only immunized or only BU treated and that the tumor-neutralizing activity of spleen cells from rats treated by immunization followed by BU was abrogated by treatment with anti-T-serum and complement. It was suggested that the enhanced antitumor transplantation resistance caused by BU was due to enhanced T-cell immune responses to tumor cells. Enhancement of anti-tumor transplantation resistance by BU was significantly abrogated by adoptive transfer with thymus cells and was slightly abrogated with spleen cells from rats immunized with X-irradiated KMT-17 cells 1 day before tumor challenge but receiving no other treatment. Transfer of sera from the immunized rats had no effect on enhancement by BU. These results, taken together, suggest that the mechanism of the enhancement by BU involved a selective elimination of the immunosuppressor cells from the immunized hosts.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Mizushima Y,Sendo F,Takeichi N,Hosohawa M,Kobayashi Hsubject
Has Abstractpub_date
1981-07-01 00:00:00pages
2917-21issue
7eissn
0008-5472issn
1538-7445journal_volume
41pub_type
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