Anti beta 2-glycoprotein I antibodies in a patient with catastrophic antiphospholipid syndrome.
Autoimmune antiphospholipid antibodies are a hallmark of patients with antiphospholipid syndrome, and require a protein cofactor, beta 2-glycoprotein I, to bind anionic phospholipids. In these same patients, moreover, IgG directly binding beta 2-glycoprotein I are described. We found high plasma titres of both IgM and IgG anti beta 2-glycoprotein I antibodies in a patient with catastrophic antiphospholipid syndrome. After passing plasma through a Sephacryl S-300 column, an identical distribution pattern between anti beta 2- glycoprotein I and anticardiolipin antibodies was observed. Moreover, when IgG immunocomplexes were isolated from a high molecular fraction, IgM anti- beta 2-glycoprotein I and anticardiolipin antibodies were detected. Thus IgG, IgM ad IgG-IgM complexes of anti-beta 2-glycoprotein I antibodies are present at the same time in a patient with antiphospholipid syndrome.
Pengo
V
V
Dept. of Cardiology, University of Padua School of Medicine, Italy.
Biasiolo
A
A
Grazia Fior
M
M
Ruffatti
A
A
D000208:Acute Disease; D000328:Adult; D017153:Antibodies, Anticardiolipin / Q000097:blood*; D016736:Antiphospholipid Syndrome / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006023:Glycoproteins / Q000097:blood*; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D007075:Immunoglobulin M / Q000097:blood; D053482:beta 2-Glycoprotein I
D017153:Antibodies, Anticardiolipin; D006023:Glycoproteins; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D053482:beta 2-Glycoprotein I