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B lymphocytes can be stimulated by concanavalin A in the presence of humoral factors released by T cells

Concanavalin A (Con A) induces proliferation in thymus‐derived (T) lymphocytes, whereas it does not induce DNA synthesis in bone marrow‐derived (B) lymphocytes. However, in the presence of humoral factors released by normal thymus lymphocytes during 24 h in culture, B cells become competent to respond to Con A. The optimal dose of Con A for induction of proliferation in B cells treated with T cell supernatant was identical to that for T cell proliferation. Nonspecifically activated T cells were more effective than normal T cells to produce humoral factors making B cells competent to respond to Con A.