title: A rosette technique for identification of human mononuclear cells bearing Fc receptors.
abstract: A rosette technique has been described which showed some human mononuclear cells to bind chicken red blood cells coated with rabbit anti-chicken erythrocyte antibodies (EA). Intact 7S Ig, but not their F(ab')2 fragments, were found to sensitize chicken erythrocytes; therefore it was concluded that this rosette technique detects cells bearing receptors for the Fc portion of IgG. Among the different parameters of the reaction which were studied, centrigugation at 4 degrees C appeared necessary for obtaining the maximum number of rosettes. Kinetics of rosette dissociation indicated low and heterogeneous binding avidities. Distribution of EA-rosette forming cells among different organs appeared extremely heterogeneous: 8-28% were found in blood, spleen and bone marrow, whereas about 3% were found in lymph nodes and less than 1% in tonsils and thymus; this suggests that EA-rosette forming cells are not restricted to a single subclass of either T or B lymphocytes.
mesh_terms: D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007141:Immunoglobulin Fc Fragments / Q000378:metabolism*; D007158:Immunologic Techniques; D009000:Monocytes / Q000276:immunology*; D013696:Temperature
chemical_list: D007141:Immunoglobulin Fc Fragments