title: IgE-mediated chemotaxis of rat basophilic leukemia cells towards specific antigen.
abstract: We evaluated chemotactic properties of four sublines of rat basophilic leukemia cells using blindwell Boyden chamber assays. After sensitization with a mouse monoclonal IgE directed against dinitrophenyl (DNP), cells from sublines 2H3-C and 926a underwent chemotaxis toward DNP-bovine serum albumin (BSA) and sublines RBL-1 and 4A did not. Chemotactic responses required specific IgE and were determined by the IgE antigen specificity used for sensitization. The threshold for chemotaxis was on the order of 10(-10) M DNP-BSA. Release of incorporated [3H]-serotonin did not always parallel chemotactic responses, which suggests that chemotaxis and secretion may be two unlinked processes that occur during basophil activation. Our results predict a possible in vivo mechanism whereby specific chemotactic responses of basophils and other FcR epsilon-bearing cells are mediated via specific IgE bound to membrane FcR epsilon.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001491:Basophils / Q000276:immunology*; D002460:Cell Line; D002634:Chemotaxis, Leukocyte; D004140:Dinitrophenols; D000939:Epitopes / Q000276:immunology; D007073:Immunoglobulin E / Q000276:immunology*; D007942:Leukemia, Experimental; D051379:Mice; D051381:Rats; D012710:Serum Albumin, Bovine / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D004140:Dinitrophenols; D000939:Epitopes; C034638:dinitrophenyl-bovine serum albumin; D012710:Serum Albumin, Bovine; D007073:Immunoglobulin E