title: T cells recognizing polysaccharide-specific B cells function as contrasuppressor cells in the generation of T cell immunity to Pseudomonas aeruginosa.
abstract: The cellular interactions involved in the development of T cell-mediated immunity to Pseudomonas aeruginosa have been examined. T cell immunity can be generated by immunizing mice with 10 micrograms of P. aeruginosa polysaccharide (PS) plus the antimitotic agent vinblastine sulfate. Vinblastine is required to inactivate a population of Ts cells generated by immunization with 10 micrograms of PS alone. Immunization with either live bacteria or with higher dose (50 micrograms) of PS without vinblastine also generates T cell immunity; these protocols activate a population of Lyt-1+, 2-, I-J+ T cells which, like vinblastine, counteract the effect of Ts cells. Immunization with 10 micrograms PS alone fails to activate this T cell subpopulation. When administered at the time of immunization, this subpopulation can render the tolerogenic 10-micrograms immunization protocols immunogenic. Like previously described contrasuppressor T cells, this T cell subpopulation exhibits an affinity for the lectin Vicia villosa. We have determined, however, that the T cells that act as contrasuppressor cells in this system are directly activated by PS-immune B cells and not by PS Ag. Furthermore, their activity can be removed by adsorption to PS-specific B cell hybridomas. Our studies indicate an important role for B cells in the development of T cell immunity to P. aeruginosa and suggest that a complex idiotype network controls the development of this response.
mesh_terms: D000380:Agranulocytosis / Q000150:complications; D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D007116:Immunization, Passive; D037102:Lectins / Q000378:metabolism; D008211:Lymphocyte Cooperation; D051379:Mice; D008807:Mice, Inbred BALB C; D037121:Plant Lectins; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D011552:Pseudomonas Infections / Q000150:complications / Q000517:prevention & control; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology* / Q000637:transplantation
chemical_list: D000942:Antigens, Bacterial; D037102:Lectins; D037121:Plant Lectins; D011135:Polysaccharides, Bacterial; C042242:Vicia lectins