title: Anti-phospholipid antibody isotypes in normal human sera.
abstract: Heat-sensitive serum masking cofactor(s) of antiphospholipid antibody (aPL) in normal human sera (NHS) are specifically inactivated at 56 degrees C. The degree of binding in ELISA by unmasked aPL in NHS was equivalent to that in non-heated, aPL-reactive autoimmune SLE sera. Previously "negative" SLE sera also reacted equally strongly in the aPL ELISA when similarly heat-inactivated. Isotype studies by ELISA of the heat-potentiated aPL in 36 NHS revealed the presence of specific IgG (34/36), IgM (11/36) and IgA (24/36) aPL antibodies. 11/36 (31%) NHS had all three aPL isotypes while 13/36 (36%) had both IgG and IgA antibodies to phospholipid.
authors.affiliation: Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur.
authors.forename: H M
authors.initials: HM
authors.lastname: Cheng
authors.forename: K K
authors.initials: KK
authors.lastname: Wong
mesh_terms: D002308:Cardiolipins / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D006358:Hot Temperature; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007132:Immunoglobulin Isotypes / Q000032:analysis*; D007075:Immunoglobulin M / Q000032:analysis; D008180:Lupus Erythematosus, Systemic / Q000276:immunology; D010743:Phospholipids / Q000276:immunology*
chemical_list: D002308:Cardiolipins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007132:Immunoglobulin Isotypes; D007075:Immunoglobulin M; D010743:Phospholipids