Monoclonal antibody H 9/25 reacts with functional subsets of T and B cells: killer, killer precursor and plaque‐forming cells

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Abstract
Monoclonal antibody (McAb) H9/25 has previously been shown to react with an alloantigen expressed on subpopulations of mouse lymphocytes. We here investigated the expression of the antigen (H9/25 Ag) on functional subsets of T and B cells. Lymphocytes were depleted of H9/25 Ag‐bearing cells by complement‐dependent cytolysis or by the affinity to immobilized McAb H 9/25, and the residual immunological functions were tested. In these tests, killer T cells generated in mixed lymphocyte cultures and their precursors were found to express H9/25 Ag. In contrast, the activity and frequency of helper T cells specific to keyhole limpet hemocyanin carrier were not decreased by the depletion of H9/25 Ag‐bearing cells. On the other hand, IgG and IgM anti‐TNP plaque‐forming cells were found to express H9/25 Ag, while it was not detected on unprimed B cells, as tested by using TNP‐Ficoll and TNP‐lipopolysac‐charide. Only a small proportion of TNP memory B cells seemed to express the antigen. These results revealed significant differences between H 9/25 Ag and other known alloantigens in the distribution among functional subsets of lymphocytes.

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