Role of antigen-specific T cell help in the generation of in vivo antibody responses. II. Sustained antigen-specific T cell help is required to induce a specific antibody response.
The injection of mice with a goat or rabbit antibody to mouse IgD stimulates a large polyclonal IgG response, approximately 10% of which is specific for antigenic determinants on the anti-IgD antibody molecule. The large goat IgG (GIgG)-specific antibody response in mice injected with goat antibody to mouse IgD requires that GIgG-specific B cells undergo much greater clonal expansion than B cells specific for other Ag. One possible explanation for the greater clonal expansion of GIgG-specific B cells is that B cells that lack GIgG specificity can only be stimulated with GIgG-specific T help during the relatively short time that anti-IgD binds to, and is processed and presented by, these B cells before they cease to express membrane mIgD. In contrast, GIgG-specific B cells can continue to bind, process, and present GIgG through mIgM after they lose mIgD. To test the hypothesis that extended stimulation with Ag-specific T help is required to generate a specific antibody response, we determined time requirements for Ag-specific T cell help for the development of such a response. Mice were injected with rabbit antibody to mouse IgD plus one or more daily injections of FITC conjugated to a F(ab')2 fragment of rabbit IgG (FITC-(Fab')2), which has a short in vivo half-life, and IgG1 anti-FITC antibody production was analyzed. In this system, each additional injection of FITC-F(ab')2 extends the period during which FITC-specific B cells can process this Ag and present it to rabbit IgG-specific T cells. Each additional injection of FITC-F(ab')2 stimulated a several-fold increase in IgG1 anti-FITC antibody levels, and injections on 5 consecutive days were required to induce a maximal anti-FITC response. These observations provide evidence that sustained Ag-specific T cell help is required to stimulate the degree of B cell clonal expansion that characterizes a specific antibody response.
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D000939:Epitopes; D005260:Female; D016650:Fluorescein-5-isothiocyanate / Q000276:immunology; D006241:Haptens / Q000276:immunology; D007072:Immunoglobulin D / Q000276:immunology; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D008211:Lymphocyte Cooperation; D051379:Mice; D008807:Mice, Inbred BALB C; D013601:T-Lymphocytes / Q000276:immunology*
D000888:Antibodies, Anti-Idiotypic; D000939:Epitopes; D006241:Haptens; D007072:Immunoglobulin D; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D016650:Fluorescein-5-isothiocyanate