title: Antiphospholipid antibodies in Chilean patients with systemic lupus erythematosus.
abstract: Antiphospholipid antibodies (aPLs) are a heterogeneous family of antibodies found in autoimmune disorders, infectious diseases, and other situations. The presence of different aPLs has been associated with various clinical manifestations of the antiphospholipid syndrome (APS). The objective of this study was to investigate the prevalence of aPLs in a group of 90 Chilean patients with systemic lupus erytematosus (SLE) and 90 healthy controls. We measured anticardiolipin antibodies (aCLs), antiphosphatidylserine antibodies (aPSs), anti-beta(2) glycoprotein I antibodies (anti-beta(2)GPIs), and antiprothrombin antibodies (aPTs) with an enzyme-linked immunosorbent technique using "in-house" assays. Fifty-four of 90 SLE patients (60.0%) had some type of aPL. Forty of 90 (44.4%) were positive for aCLs, 9 of 61 (14.8%) had aPSs, 21 of 90 (23.3%) had anti-beta(2)GPIs, and 18 of 90 (20.0%) had aPTs. In the control group, prevalences were as follows: aCLs, 3.3%; aPSs, 1.1%; anti-beta(2)GPIs, 1.1%; aPTs, 2.2%. In most cases, values were in the low-positive range. Of all aPL detected, 29.5% was of the IgG isotype, 37.5% IgM, and 33.0% IgA. We observed a correlation between aCLs and aPSs and of these antibodies with anti-beta(2)GPIs and aPTs but not between anti-beta(2)GPIs and aPTs. Our results show a high prevalence of aPLs in SLE patients. An association between different specificities and isotypes of aPLs was also observed.
authors.affiliation: Department of Clinical Biochemistry and Immunohematology, School of Health Sciences, University of Talca.
authors.forename: Ivan
authors.initials: I
authors.lastname: Palomo
authors.forename: Jaime
authors.initials: J
authors.lastname: Pereira
authors.forename: Marcelo
authors.initials: M
authors.lastname: Alarcon
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Larrain
authors.forename: Carmen
authors.initials: C
authors.lastname: Pinochet
authors.forename: Marcela
authors.initials: M
authors.lastname: Vasquez
authors.forename: Maria T
authors.initials: MT
authors.lastname: Velez
authors.forename: M
authors.initials: M
authors.lastname: Leon
authors.forename: Ricardo
authors.initials: R
authors.lastname: Espinola
authors.forename: Silvia
authors.initials: S
authors.lastname: Pierangeli
mesh_terms: D000328:Adult; D017153:Antibodies, Anticardiolipin / Q000096:biosynthesis; D017152:Antibodies, Antiphospholipid / Q000096:biosynthesis*; D002677:Chile; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006023:Glycoproteins / Q000276:immunology; D006801:Humans; D007132:Immunoglobulin Isotypes / Q000096:biosynthesis; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D008297:Male; D010718:Phosphatidylserines / Q000276:immunology; D053482:beta 2-Glycoprotein I
chemical_list: D017153:Antibodies, Anticardiolipin; D017152:Antibodies, Antiphospholipid; D006023:Glycoproteins; D007132:Immunoglobulin Isotypes; D010718:Phosphatidylserines; D053482:beta 2-Glycoprotein I