Activation of antigen-enriched B cells. II. Role of linked recognition in B cell proliferation to thymus-dependent antigens.
The responsiveness to T-dependent (TD) and T-independent (TI) TNP-antigens of murine splenic B cells previously enriched for antigen-binding cells (ABC) was examined. TNP-TI antigens induced B cell proliferation. TNP-TD antigens did not induce a proliferative response regardless of the physical form or nature of the TNP-TD antigen (e.g., soluble vs particulate, low or high haptenation of carrier, TNP on various insoluble matrices, etc.). TNP-TD antigens were effective in enhancing the response of the TNP-ABC to all concentrations of lipopolysaccharide (LPS) tested, indicating that binding of antigen to surface immunoglobulin alters the LPS responsiveness of the cell. Irradiated, keyhole limpet hemocyanin- (KLH) primed T cells induced a threefold to fourfold greater B cell proliferative response with TNP-KLH than with fluoresceinated KLH (FLU-KLH) or FLU-KLH together with TNP-human serum albumin (TNP-HSA). Therefore, linked recognition appears essential for optimal T cell-mediated B cell proliferation, whereas the induction of B cell proliferation via nonlinked, carrier-activated T cells is a minor component of the response.
D000818:Animals; D000941:Antigens / Q000235:genetics / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D008040:Genetic Linkage; D006433:Hemocyanins / Q000276:immunology; D007152:Immunologic Capping; D008070:Lipopolysaccharides / Q000276:immunology; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011947:Receptors, Antigen, B-Cell; D013601:T-Lymphocytes / Q000276:immunology; D014301:Trinitrobenzenes / Q000276:immunology
D000941:Antigens; D008070:Lipopolysaccharides; D011947:Receptors, Antigen, B-Cell; D014301:Trinitrobenzenes; D006433:Hemocyanins