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Monoclonal antibody to human cytotoxic-suppressor T-lymphocytes cross-reacts with canine lymphocytes and inhibits cell-mediated lympholysis of canine cells.

Of 19 murine antihuman Tp32 (T8) monoclonal antibodies tested, only antibody T811 showed cross-reactivity with canine lymphoid cells. It recognized an antigen expressed on 19%-27% of peripheral blood mononuclear cells (PBMC), 20%-30% of peripheral Thy 1+ T-lymphocytes, 40% of puppy thymocytes, 35%-45% of alloantigen-activated peripheral lymphocytes, and 100% of PBMC from a dog with acute T-cell leukemia. The antigen was not expressed on peripheral Thy 1- cells, bronchoalveolar cells, or null-type acute leukemia cells. The antibody inhibited cell-mediated lympholysis in the absence of complement, while antibody F3-20-7 directed at the canine Thy 1 antigen did not. It was not possible to precipitate a corresponding cell surface antigen on canine cells using standard 125I radioimmunoprecipitation techniques nor did the antibody cause antigenic modulation. Our data suggest that monoclonal antibody T811 reacts with a functional subset of canine T-lymphocytes similar to that of human cells; however, significant differences may exist between the antigens recognized on these cells in the two species.