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Proliferation of C3HXCBA Hybrid Lymphocytes in the Spleens of Irradiated CBA Mice: Inhibition of this Phenomenon by Pretreatment of the Hosts with C3HXCBA Spleen Cells

Lymphocytes from C3HXCBA hybrid mice proliferate intensely in the spleens of irradiated CBA mice. Presentment of the CBA hosts with C3HXCBA spleen cells, known to specifically reduce the T‐cell reactivity of the hosts against the strongly stimulatory Mls‐antigen determined by the C3H‐genome, abolished the capacity of the host to promote proliferation of C3HXCBA lymphocytes. In contrast, proliferation of C3HXCBA bone marrow cells, as measured by splenic 59Fe incorporation, was unaffected by such pretreatment. By examining the capacity of spleen cell populations of (C3HXCBA)XCBA back‐cross mice to inhibit lymphocyte proliferation, as described above, and to express the C3H‐delermincd Mls‐antigen, it was concluded that these two trails are associated.