Abstract
Antibody responses deeply rely on the interaction of antigen-primed B cells and CD4 helper T cells in the context of germinal center reactions, through signals provided by costimulatory molecules and cytokines. B-cell proliferation and differentiation in antibody-secreting plasma cells are processes that critically depend on the helper function of a specific CD4 T-cell subset, known as follicular helper T cells (Tfh). Here, we describe a method that mimics in vitro the cross talk between Tfh and B cells occurring in the germinal center. The procedure is based on setting up a coculture system with B cells and Tfh isolated from blood of healthy donors, or tonsils removed upon surgical intervention, in order to recapitulate in vitro the Tfh-dependent mechanisms leading to B cells' activation, proliferation, and differentiation.
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