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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

CD23 and CD21 function as adhesion molecules in homotypic aggregation of human B lymphocytes.

We have previously found that interleukin-4 and CD40 monoclonal antibodies (mAb) are strong potentiators of homotypic B cell aggregation which is dependent on LFA-1. We show here that CD23 mAb were also able to inhibit aggregation to a similar extent as LFA-1 antibodies. This inhibition was restricted to the MHM6 epitope of CD23 and antibodies to other epitopes [Epstein-Barr virus (EBV) CS-1, EBV CS-2, EBV CS-5 and mAb 25] or occupation of the Fc-binding site by IgE had no or a slightly enhancing effect on aggregation. When testing two antibodies to CD21, the recently defined ligand for CD23, one of these (BU32) was found to be inhibitory whereas the other (THB5) had no effect. By combining antibodies to LFA-1 and CD23, aggregation was often completely inhibited. These data suggest that LFA-1/ICAM-1 and CD23/CD21 are the major molecules involved in homotypic aggregation of human B cells.[1]


  1. CD23 and CD21 function as adhesion molecules in homotypic aggregation of human B lymphocytes. Björck, P., Elenström-Magnusson, C., Rosén, A., Severinson, E., Paulie, S. Eur. J. Immunol. (1993) [Pubmed]
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