Abstract
Three monoclonal antibodies (MoAb), named 8A, 8F6 and 62B1, reacting with plasma cell-associated antigens, were characterized. 8A was found to be positive throughout the B cell lineage maturation steps from the immature B-committed CD10+ cell to the plasma cells. 8F6 and 62B1 reactivity is restricted to more mature cells and related lymphoid malignancies. In particular 62B1 appears to be limited to hairy cells and plasma cells. The results show that it is possible to obtain reagents reacting with plasma cells by immunizing mice with cells derived from human multiple myelomas. Furthermore, the obtained results suggest that it is possible to elicit antibodies against antigens which are present throughout all the differentiation steps of the B cell lineage. These new MoAb could help in elucidating the phenotype of the plasma cells and the relationships of multiple myelomas with other B cell proliferative disorders.
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