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pubmed-article:1826018pubmed:abstractTextThe possible role of CD23 in the activation of human B lymphocytes was systematically investigated by examining the effect of: 1) anti-CD23 mAb; 2) IgE or IgE-immune complexes and; 3) native or recombinant soluble CD23 of different m.w., on B cell proliferation. Intact anti-CD23 mAb or its F(ab')2 fragments inhibit the proliferation of tonsillar B lymphocytes costimulated with either Staphylococcus aureus Cowan I (SAC) or anti-IgM and IL-4. The antibody has no effect when IL-2 or LMW-BCGF is used as the second stimulant. The response of IL-4-pretreated B cells (expressing high levels of CD23) to anti-IgM together with IL-2 or B cell-derived B cell growth factor is inhibited by anti-CD23 mAb, indicating that this antibody prevents B cell activation regardless of the B cell activators but provided that the density of CD23 on B cells is sufficient. Anti-CD23 mAb markedly inhibits DNA synthesis only when added during the first 12 h of the culture and has no effect on the ongoing proliferation of CD23-bearing B cell blasts (SAC induced and IL-4 supported or EBV transformed). Monovalent Fab fragments of anti-CD23 mAb are inactive unless they are used in tandem with goat anti-mouse Fab suggesting that the inhibition is due to cross-linking of surface CD23. Most interestingly, polymeric IgE or IgE-immune complexes have the same effect as anti-CD23 and moreover they inhibit IgM production by SAC and IL4-stimulated B cells. The inhibiting effect of IgE or of anti-CD23 mAb is not due to their neutralization of soluble CD23 because these failed to display B cell growth factor activity under various experimental conditions. It is concluded that IgE-immune complexes may regulate activation and differentiation of CD23-bearing surfaceIgM/surfaceIgD precursor B lymphocytes.lld:pubmed
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pubmed-article:1826018pubmed:articleTitleCross-linking of CD23 antigen by its natural ligand (IgE) or by anti-CD23 antibody prevents B lymphocyte proliferation and differentiation.lld:pubmed
pubmed-article:1826018pubmed:affiliationUniversity of Montreal, Notre-Dame Hospital, Research Center, Canada.lld:pubmed
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