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B Lymphocytes as Antigen-Presenting Cells for CD4⁺ T Cell Priming In Vivo¹

Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06520

The contribution of B lymphocytes as APCs for CD4⁺ T cell priming remains controversial, based on findings that B cells cannot provide the requisite ligating and costimulatory signals for naive T cells to be activated. In the current study, we have examined Ag-specific T:B cell collaboration under circumstances in which B cells take up Ag through Ig receptors in vivo. This results in their activation and an ability to effectively stimulate naive CD4⁺ T cells both in vitro and in vivo. The aim of this work was to establish some of the key molecular interactions, as well as kinetics, between Ag-specific T and B cells that enable this priming to take place. Our approach was to amplify the starting pools of both Ag-specific T and B cell populations in vivo to track directly the events during initial T:B cell collaborations. We show that the induction of optimal levels of T cell priming to a protein Ag requires the involvement of Ag-specific B cells. The interaction that results between Ag-specific T and B cells prevents the down-modulation of B7 costimulatory molecules usually observed in the absence of appropriate T cells. Moreover, this prevention in down-modulation is independent of CD40:CD40 ligand contact. Finally, we present data suggesting that once Ag-specific T and B cells interact, there is a rapid (1–2-h) down-regulation of antigenic complexes on the surface of the B lymphocytes, possibly to prevent them from engaging other T cells in the vicinity and therefore focus the initial interaction.

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