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Blood, 15 April 2005, Vol. 105, No. 8, pp. 3247-3254.
Prepublished online as a Blood First Edition Paper on January 11, 2005; DOI 10.1182/blood-2004-08-3165.
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IMMUNOBIOLOGY
CD19 regulates positive selection and maturation in B lymphopoiesis: lack of CD19 imposes developmental arrest of immature B cells and consequential stimulation of receptor editing
Eran Diamant,
Zohar Keren, and
Doron Melamed
From the Department of Immunology, Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology and the Rappaport Family Institute for Research in the Medical Sciences, Haifa, Israel.
Ligand-independent signals that are produced by the B-cell antigen receptor (BCR) confer an important positive selection checkpoint for immature B cells. Generation of inappropriate signals imposes developmental arrest of immature B cells, though the fate of these cells has not been investigated. Studies have shown that the lack of CD19 results in inappropriate signaling. In immunoglobulin transgenic mice, this inappropriate signaling impairs positive selection and stimulates receptor editing. Here, we studied the extent and significance of receptor editing in CD19-regulated positive selection of normal, nontransgenic B lymphopoiesis, using our bone marrow culture system. We found that the lack of CD19 resulted in elevated tonic signaling and impaired maturation, as revealed by surface marker expression and by functional assays. Immature CD19-/- B cells did not suppress RAG and underwent intensive receptor editing attempts in culture. Finally, in vivo analysis of light-chain isotype expression and J use in CD19-/- mice validated our in vitro observations. Our results suggest that CD19 has an important function in regulating positive selection and maturation of nontransgenic B-cell precursors and that receptor editing is an important salvage mechanism for immature B cells that fail positive selection. (Blood. 2005;105:3247-3254)
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