title: Interaction between C3 nephritic factor and erythrocyte membranes. Presence of nephritic factor in patients' erythrocytes.
abstract: The presence of IgG has been observed by fluorescence microscopy in the erythrocytes of 5 patients with NEF antibody. IgG subclass distribution of the IgG bound was analyzed by fluorescence-activated cell sorter. NEF activity was also determined in the eluted antibodies from the erythrocyte membrane. Three of five patients had NEF antibody bound to the erythrocyte membrane. IgG subclass distribution of NEF antibody sera was also investigated by means of protein A-Sepharose and using monoclonal antibodies against human IgG subclasses. NEF activity was mediated by IgG3 alone in 3 patients and by a combination of IgG1 and IgG3 in 2 patients.
authors.affiliation: Department of Laboratory Medicine, La Paz Hospital, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: López-Trascasa
authors.forename: M A
authors.initials: MA
authors.lastname: Marín
authors.forename: G
authors.initials: G
authors.lastname: Fontán
mesh_terms: D000906:Antibodies / Q000032:analysis; D000936:Antigen-Antibody Complex / Q000032:analysis / Q000276:immunology; D002469:Cell Separation; D003178:Complement C3 Nephritic Factor / Q000032:analysis / Q000378:metabolism*; D003169:Complement Inactivator Proteins / Q000378:metabolism*; D004910:Erythrocyte Membrane / Q000276:immunology / Q000378:metabolism*; D004912:Erythrocytes / Q000032:analysis* / Q000276:immunology; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis / Q000276:immunology; D008856:Microscopy, Fluorescence
chemical_list: D000906:Antibodies; D000936:Antigen-Antibody Complex; D003178:Complement C3 Nephritic Factor; D003169:Complement Inactivator Proteins; D007074:Immunoglobulin G