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  • Title: Suppressor and reactive lymphocytes in radiation leukemia virus (RadLV)-induced leukemogenesis.
    Author: Yefenof E, Ben-David Y.
    Journal: Cancer Immunol Immunother; 1983; 16(1):48-52. PubMed ID: 6227381.
    Abstract:
    Suppressor cells capable of enhancing tumor growth in vivo and of abrogating a potential anti-tumor immunity in vitro are generated in C57BL/6 mice inoculated with the high-leukemogenic A-RadLV. Mice inoculated with low-leukemogenic D-RadLV do not develop suppressor cells but contain anti-tumor reactive lymphocytes that can inhibit in vivo tumor growth. Cyclophosphamide (CyF) treatment of mice inoculated with A-RadLV hampered suppressor cell function and rendered the animals' lymphocytes responsive to A-RadLV induced tumor cells in vitro. Administration of CyF also reduced leukemia incidence in mice inoculated with A-RadLV, but had no effect on leukemia induction by D-RadLV in irradiated mice. It is suggested that the high leukemogenic activity of A-RadLV depends on the virus' ability to recruit CyF-sensitive suppressor cells early in latency and that tumor progression in mice inoculated with D-RadLV is arrested due to the host immune response.
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