A significant proportion of cord blood CD5+ B cells express the activation molecules CD23, CD25, and transferrin receptor; react with the cell-cycle-associated monoclonal antibody (MoAb) Ki67; can be induced to enter the S phase of cell cycle by interleukin-2 (IL-2), IL- 4, or low-molecular-weight B-cell growth factor (Imw-BCGF) and, exposed to IL-1 and IL-2, acquire the features (sIgD-, CD5-, CD10+, CD38+) of B blasts proliferating in the germinal centers of secondary follicles. These findings indicate that CD5+ B cells are preactivated and, in the proper microenvironment, may give rise to CD5- B cells.
Human normal CD5+ B lymphocytes can be induced to differentiate to CD5- B lymphocytes with germinal center cell features
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F Caligaris-Cappio, M Riva, L Tesio, M Schena, G Gaidano, L Bergui; Human normal CD5+ B lymphocytes can be induced to differentiate to CD5- B lymphocytes with germinal center cell features. Blood 1989; 73 (5): 1259–1263. doi: https://doi.org/10.1182/blood.V73.5.1259.bloodjournal7351259
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