title: Differential expression of a surface antigen recognized by a monoclonal antibody, J11d, on unprimed and primed B cells.
abstract: Functional studies of both polyclonal and antigen-specific responses have suggested that murine B cells differ in the expression of an antigen recognized by a rat anti-mouse monoclonal antibody, called J11d. Using both positive and negative selection, we now demonstrate that the J11d marker is differentially displayed on B lymphocytes responding to LPS vs anti-mu, as well as on unprimed vs specific antigen-primed B cells. Thus, cytotoxic elimination of cells expressing high levels of J11d (J11d-hi) reduced LPS-driven B cell proliferation by 60 to 80% but had no effect on anti-mu stimulated B cell growth. Interestingly, equal numbers of positively selected J11d-hi B cells responded similarly to LPS and anti-mu plus B cell growth factors, a result that suggests that the response to anti-mu of the J11d-lo B cells is normally masked by the majority J11-d-hi cells. In further studies, the primary PFC response of normal murine spleen cells to fluorescein (FL)-coupled TI antigens or to LPS in vitro was reduced dramatically by cytotoxic J11d antibody treatment. In contrast, the anti-FL PFC response of spleen cells from mice primed 1 wk previously with FL-Ficoll was not affected by J11d antibody treatment, whereas the response of these FL-primed B cells to TNP (to which the mice were not primed) was greatly reduced by J11d + complement treatment. Our data indicate that antigen-experienced (activated) B cells are primarily found in the J11d-lo B cell subset and that unprimed (resting) B cells are found in the J11d-hi population, although both populations of murine B cells can respond to anti-mu. These studies also provide further evidence for B cell heterogeneity.
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000502:physiology; D000911:Antibodies, Monoclonal / Q000502:physiology; D000917:Antibody Formation; D000937:Antigen-Antibody Reactions; D000954:Antigens, Surface / Q000032:analysis* / Q000276:immunology; D000955:Antigens, T-Independent / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D002470:Cell Survival; D003165:Complement System Proteins; D003208:Concanavalin A / Q000494:pharmacology; D005434:Flow Cytometry; D006241:Haptens / Q000276:immunology; D007075:Immunoglobulin M / Q000502:physiology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D051381:Rats; D011917:Rats, Inbred Lew; D013154:Spleen
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D000955:Antigens, T-Independent; D006241:Haptens; D007075:Immunoglobulin M; D008070:Lipopolysaccharides; C044203:anti-IgM; D003208:Concanavalin A; D003165:Complement System Proteins