The germinal center (GC) is an anatomic compartment found in peripheral lymphoid organs, wherein B cells undergo clonal expansion, somatic mutation, switch recombination, and reactivate immunoglobulin gene V(D)J recombination. As a result of somatic mutation, some GC B cells develop higher affinity antibodies, whereas others suffer mutations that decrease affinity, and still others may become self-reactive. It has been proposed that secondary V(D)J rearrangements in GCs might rescue B cells whose receptors are damaged by somatic mutations. Here we present evidence that mature human tonsil B cells coexpress conventional light chains and recombination associated genes, and that they extinguish recombination activating gene and terminal deoxynucleotidyl transferase expression when their receptors are cross-linked. Thus, the response of the recombinase to receptor engagement in peripheral B cells is the opposite of the response in developing B cells to the same stimulus. These observations suggest that receptor revision is a mechanism for receptor diversification that is turned off when antigen receptors are cross-linked by the cognate antigen.
Antigen Receptor Engagement Turns off the V(D)J Recombination Machinery in Human Tonsil B Cells
Address correspondence to Michel C. Nussenzweig, Laboratory of Molecular Immunology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10021. Phone: 212-327-8067; Fax: 212-327-8370; E-mail: [email protected]
E. Meffre was supported by a grant from the Philippe Foundation, and P. Cohen by National Institutes of Health (NIH) Medical Scientist Training Program grant GM-77039. This work was supported by grants from the NIH to M.C. Nussenzweig. M.C. Nussenzweig is an associate investigator of the Howard Hughes Medical Institute.
Eric Meffre, Fotini Papavasiliou, Paul Cohen, Odette de Bouteiller, Diana Bell, Hajime Karasuyama, Claudine Schiff, Jacques Banchereau, Yong-Jun Liu, Michel C. Nussenzweig; Antigen Receptor Engagement Turns off the V(D)J Recombination Machinery in Human Tonsil B Cells . J Exp Med 17 August 1998; 188 (4): 765–772. doi: https://doi.org/10.1084/jem.188.4.765
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