title: Idiotypes on B lymphocytes: association with immunoglobulins.
abstract: Several idiotypic (Id) specificities have been identified by immunofluorescence on the membranes of B cells in the spleens of nonimmune mice. These determinants are displayed at frequencies varying from 0.22 to 1.83% of B cells and are entirely immunoglobulin (Ig) in nature. No Id determinants were observed on the membranes of four Slg- Abelson virus-transformed pre-B cell lines that are sensitive to LPS. Under our experimental conditions, we did not observe a significant increase in 3H-thymidine incorporation subsequent to the in vitro incubation of splenic lymphocytes from normal mice with various amounts of anti-Id antibodies specific for several cross-reactive (IdX) or individual Id. Similarly, in utero exposure to anti-Id antibodies against myeloma proteins specific for T-independent antigens displaying B cell mitogenic properties did not alter the proliferation of lymphocytes induced by these mitogens. In contrast, exposure to anti-Id antibodies in vitro as well as in utero had a profound and specific effect on the corresponding antibody responses and maturation of small lymphocytes into plasma cells. When normal B cells were cultured with the B cell mitogen LPS in the presence of anti-Id antibodies directed against the J558IdX, specific suppression of the maturation of IdX+ plasma cells was observed. In mice exposed to maternal anti-Id in utero, we observed a severe inability to mount an immune response to any compound that elicited antibody molecules bearing the Id that was complementary to the maternal anti-Id. These same maternally Id-suppressed mice, however, gave a normal response when the same compound was presented as a mitogen. Our results reinforce the concept that Id on membranes of B lymphocytes are associated only with Ig receptors and do not support the possibility of mitogen-like poly-clonal stimulatory properties of anti-Id antibodies.
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000032:analysis*; D001402:B-Lymphocytes / Q000276:immunology*; D000939:Epitopes / Q000032:analysis; D005260:Female; D007126:Immunoglobulin Allotypes / Q000032:analysis; D007130:Immunoglobulin Idiotypes / Q000032:analysis* / Q000276:immunology; D007152:Immunologic Capping; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D008934:Mitogens / Q000494:pharmacology; D011947:Receptors, Antigen, B-Cell / Q000032:analysis; D013154:Spleen / Q000166:cytology
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000939:Epitopes; D007126:Immunoglobulin Allotypes; D007130:Immunoglobulin Idiotypes; D008934:Mitogens; D011947:Receptors, Antigen, B-Cell