title: Independent ligand occupancy and cross-linking of surface Ig and Fc gamma receptors downregulates B-lymphocyte function. Evaluation in various B-lymphocyte populations.
abstract: When two distinct B-lymphocyte membrane receptors (Fc gamma R and sIg) are independently occupied by their respective multivalent ligands, inhibition of the antibody-forming cell response occurs but proliferation is not inhibited. This regulatory signal was examined in various B-lymphocyte populations. Unprimed B lymphocytes from immune deficient CBA/N and autoimmune MRL/l mice were responsive to this regulatory signal. In contrast, unprimed B lymphocytes from autoimmune NZB mice and antigen-primed B lymphocytes from normal DBA/2 mice were not. Together with previous results, these data suggest that resting B lymphocytes which have not encountered antigen are most susceptible to this regulatory signal. Lack of responsiveness to this downregulatory signal may contribute to the hyper-responsiveness of NZB B lymphocytes.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D006462:Hemolytic Plaque Technique; D007108:Immune Tolerance; D008024:Ligands; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D011947:Receptors, Antigen, B-Cell / Q000276:immunology*; D011961:Receptors, Fc / Q000276:immunology; D017452:Receptors, IgG; D011971:Receptors, Immunologic / Q000276:immunology*
chemical_list: D008024:Ligands; D011947:Receptors, Antigen, B-Cell; D011961:Receptors, Fc; D017452:Receptors, IgG; D011971:Receptors, Immunologic