title: Lymphocytes bearing Fc receptors for IgE. II. Induction of Fcepsilon-receptor bearing rat lymphocytes by IgE.
abstract: The proportion of lymphocytes bearing receptors for IgE (FcepsilonR) markedly increased after infection of rats with Nippostrongylus brasiliensis (Nb). The FcepsilonR-bearing lymphocytes from the infected animals bound more IgE-coated erythrocytes in rosette assay than FcepsilonR-bearing cells from normal rats, suggesting that the number of FcepsilonR per cell may also increase following the infection. In contrast, the number of IgE-receptors on peritoneal mast cells did not change after Nb infection. The increase in the proportion of FcepsilonR-bearing lymphocytes in Nb-infected rats is probably due to an increased concentration of IgE in the environment. The proportion of FcepsilonR-bearing cells in normal rat lymphocyte suspensions increased by culture of the cells with rat IgE of 1 microgram/ml or higher concentration. Other immunoglobulins such as rat IgG, human IgE, or rabbit IgG failed to induce either FcepsilonR-bearing cells or FcgammaR-bearing cells. It was also found that induction of Fc receptors by rat IgE is confined to FcepsilonR. Kinetic studies on the induction of FcepsilonR-bearing lymphocytes in vitro showed that the proportion of these cells in lymphocyte suspensions increased within 8 hr incubation with rat IgE but not within 4 hr. Evidence was obtained that both RNA synthesis and protein synthesis, but no DNA synthesis, are required for the induction of FcepsilonR-bearing cells or the expression of the receptors on the cell surface.
mesh_terms: D000818:Animals; D001666:Binding Sites, Antibody; D004247:DNA / Q000096:biosynthesis; D003609:Dactinomycin / Q000494:pharmacology; D006725:Hookworm Infections / Q000276:immunology; D007073:Immunoglobulin E / Q000276:immunology*; D007141:Immunoglobulin Fc Fragments / Q000276:immunology*; D007700:Kinetics; D008198:Lymph Nodes / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology*; D008407:Mast Cells / Q000276:immunology; D012313:RNA / Q000096:biosynthesis; D051381:Rats; D011917:Rats, Inbred Lew; D012397:Rosette Formation
chemical_list: D007141:Immunoglobulin Fc Fragments; D003609:Dactinomycin; D007073:Immunoglobulin E; D012313:RNA; D004247:DNA