title: In vitro evidence for T-B lymphocyte collaboration in the clawed toad, Xenopus.
abstract: Requirements for an in vitro secondary antibody response to the soluble antigens dinitrophenylated keyhole limpet hemocyanin and dinitrophenylated flow gamma-globulin are described for the clawed toad, Xenopus. Priming of both hapten and carrier-specific cells is required in order to obtain good responses to the hapten. The carrier-reactive ("helper") cells do not adhere to nylon wool, are X ray-resistant and surface Ig-negative. The cell adherence and X ray sensitivity characteristics of these Xenopus "T" cells and their ability to generate a mixed lymphocyte response, allogeneic cytotoxic and helper activities, are identical to those of thymus-derived (T) cells in higher vertebrates. The hapten-reactive, antibody-secreting cell precursors are nylon-adherent, X ray-sensitive and surface Ig-positive. In the absence of other distinguishing serological markers for T cells in frogs, and considering the thymus dependency of the helper activity described here, the evidence presented is interpreted as demonstrating the requirement for antigen-specific T-B cell cooperation in response to soluble protein antigens in vitro for Xenopus.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002448:Cell Adhesion; D002645:Chickens; D004136:Dinitrobenzenes / Q000276:immunology; D005260:Female; D006433:Hemocyanins / Q000276:immunology; D007700:Kinetics; D008211:Lymphocyte Cooperation; D008297:Male; D013601:T-Lymphocytes / Q000276:immunology* / Q000528:radiation effects; D014982:Xenopus laevis; D005719:gamma-Globulins / Q000276:immunology
chemical_list: D004136:Dinitrobenzenes; D005719:gamma-Globulins; D006433:Hemocyanins