title: Thymus-derived (T) cell immunoglobulins. Presence of a receptor site for IgG and absence of large amounts of "buried" Ig determinants on T cells.
abstract: Quantitation of surface and total cell Ig obtained after lysis by detergent, urea-acid treatment, and freeze-thawing were determined on spleen cells, thymus cells, and spleen cells specifically depleted of B cells. A two- to four-fold increase in measurable Ig was found after cell lysis. All cell populations showed a similar increase in measurable Ig indicating that no discordantly large amounts of buried Ig determinants were associated with the surface of T cells. The lack of appreciable amounts of T cell Ig was confirmed by immunoprecipitation of radioiodinated cells. A theta-positive lymphoma was described which, when grown in culture, lacked detectable surface Ig but contained a receptor site for IgG. This resulted in appreciable amounts of surface IgG being associated with the tumor line when isolated from ascitic fluid of tumor-bearing mice or after preincubation of cultured cells with either heat-aggregated IgG or normal mouse serum.
mesh_terms: D000818:Animals; D001666:Binding Sites, Antibody; D002462:Cell Membrane / Q000276:immunology; D002478:Cells, Cultured; D000939:Epitopes; D007074:Immunoglobulin G; D007136:Immunoglobulins; D008223:Lymphoma / Q000276:immunology; D051379:Mice; D008806:Mice, Inbred AKR; D008815:Mice, Inbred Strains; D009374:Neoplasms, Experimental / Q000276:immunology; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000939:Epitopes; D007074:Immunoglobulin G; D007136:Immunoglobulins