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This paper provides evidence for the involvement of immune mechanisms in conferring resistance to a spontaneous AKR leukemia. It is shown that genes in the B, J, or E subregions of the H-2 complex confer resistance to a spontaneously arisen, tissue culture-adapted AKR thymoma, BW5147. A direct correlation is demonstrated between survival to injected BW5147 cells and humoral responsiveness in various hybrids obtained from crosses of AKR mice and C57BL/10 or C3H/DiSn derived congeneic strains differing at H-2. Cellular immunity appears to play no role in resistance to the proliferation of tumor cells. It is further established that development of effective humoral immunity depends on B cells and Ly-1+, 2-, 3- helper T-cells bearing the I-Jk phenotype. These findings seem directly applicable to the spontaneous disease, and results of studies using transformed cells from an overtly leukemic AKR mouse parallel those obtained using BW1547 cells.

In vivo or in vitro treatments with anti-I-J alloantisera abolish immunity to AKR leukemia.