Journal
JOURNAL OF IMMUNOLOGY
Volume 179, Issue 9, Pages 5877-5885Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.179.9.5877
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Germinal centers are structures that promote Immoral memory cell formation and affinity maturation, but the triggers for their development are not entirely clear. Activated extrafollicular B cells can form IgM-producing plasmablasts or enter a germinal center reaction and differentiate into memory or plasma cells, mostly of the IgG isotype. Vesicular stomatitis virus (VSV) induces both types of response, allowing events that promote each of these pathways to be studied. In this work, extrafollicular vs germinal center responses were examined at a cellular level, analyzing VSV-specific B cells in infected mice. We show that VSV-specific germinal centers are transiently formed when insufficient proportions of specific T cell help is available and that strong B cell activation in cells expressing high levels of the VSV-specifie BCR promoted their differentiation into early blasts, whereas moderate stimulation of B cells or interaction with Th cells restricted extrafollicular responses and promoted germinal center formation.
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