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The germinal center (GC) reaction is essential for the generation of the somatically hypermutated, high-affinity antibodies that mediate adaptive immunity. Entry into the GC is limited to a small number of B cell clones; however, the process by which this limited number of clones is selected is unclear. In this study, we demonstrate that low-affinity B cells intrinsically capable of seeding a GC reaction fail to expand and become activated in the presence of higher-affinity B cells even before GC coalescence. Live multiphoton imaging shows that selection is based on the amount of peptide-major histocompatibility complex (pMHC) presented to cognate T cells within clusters of responding B and T cells at the T-B border. We propose a model in which T cell help is restricted to the B cells with the highest amounts of pMHC, thus allowing for a dynamic affinity threshold to be imposed on antigen-binding B cells.

Original publication

DOI

10.1084/jem.20102477

Type

Journal article

Journal

J Exp Med

Publication Date

06/06/2011

Volume

208

Pages

1243 - 1252

Keywords

Animals, Antibody Affinity, Antigens, B-Lymphocytes, Cell Differentiation, Cell Proliferation, Flow Cytometry, Germinal Center, Major Histocompatibility Complex, Mice, Mice, Inbred C57BL, Mice, Transgenic, Microscopy, Fluorescence, Peptides, Photons, T-Lymphocytes