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Monoclonal antibodies B1 and B2 are thought to recognize B-lineage restricted antigens, and have been used to define stages of B-cell maturation and characterize B-cell lymphomas. Immunostaining on cryostat sections has revealed a puzzling dendritic or extracellular pattern of staining for B2 within germinal centers and neoplastic follicles. In this study B1 and B2 are localized precisely on hyperplastic and neoplastic lymphoid tissues using immuno-ultrastructural techniques on cryostat sections, cell suspensions, and cell monolayers. B1 and B2 were localized to cell surfaces, including microvillous surface projections, on small and large transformed normal and neoplastic B lymphocytes. B2, in addition to staining in lymphoid cells, was localized to anastomosing cytoplasmic processes of dendritic histiocytes. These findings explain the apparently extracellular localization of B2 in cryostat sections and indicate that patterns of staining for B2 may represent a combination of staining on lymphoid cells and dendritic histiocytes.

Immuno-ultrastructural localization of B-cell-specific monoclonal antibodies B1 and B2.