Detection of binding sites for spiroperidol on leukemic cells: its value for the phenotype characterization of lymphoid leukemias

The specific binding of the dopamine antagonist spiroperidol was studied in leukemic cell samples of various phenotypes. Among these only B-cell samples from chronic lymphocytic leukemias (7/7) and some "null" cell samples from acute lymphoblastic leukemias (2/7) showed specific binding. B cells from a prolymphocytic leukemia were negative as were also T-lymphoïd and non-lymphoïd leukemic cells at different stages of maturation. This pattern can be clearly correlated with the previous results obtained with normal blood cells and on cell lines. Moreover, it suggests that the detection of spiroperidol binding sites could provide a new means of distinguishing different phenotypes among B cells and early lymphoïd cells. Our results open the way to further studies which might show a correlation between spiroperidol binding sites and the new immunological markers defining subsets among non-T lymphoïd cells, as well as defining their physiological meaning.