Thromb Haemost 2001; 86(06): 1475-1482
DOI: 10.1055/s-0037-1616751
Review Article
Schattauer GmbH

Effect of Cardiolipin Oxidation on Solid-Phase Immunoassay for Antiphospholipid Antibodies

Michael Schlame
1   Department of Anesthesiology and the Division of Rheumatic Diseases, Hospital for Special Surgery, and the Biopolymer Mass Spectrometry Core Facility, Weill Medical College of Cornell University, New York, USA
,
Ivan Haller
1   Department of Anesthesiology and the Division of Rheumatic Diseases, Hospital for Special Surgery, and the Biopolymer Mass Spectrometry Core Facility, Weill Medical College of Cornell University, New York, USA
,
Lisa R. Sammaritano
1   Department of Anesthesiology and the Division of Rheumatic Diseases, Hospital for Special Surgery, and the Biopolymer Mass Spectrometry Core Facility, Weill Medical College of Cornell University, New York, USA
,
Thomas J. J. Blanck
1   Department of Anesthesiology and the Division of Rheumatic Diseases, Hospital for Special Surgery, and the Biopolymer Mass Spectrometry Core Facility, Weill Medical College of Cornell University, New York, USA
› Author Affiliations
Further Information

Publication History

Received 30 April 2000

Accepted 15 April 2000

Publication Date:
12 December 2017 (online)

Summary

Diagnostic assays for antiphospholipid antibodies are routinely performed on microtitre plates coated with cardiolipin. Here we show that contact between cardiolipin and NUNC-Immuno® plates leads to extensive oxidation, generating a series of peroxy-cardiolipins which were identified by electrospray ionization mass spectrometry. To investigate the impact of oxidation on the antibody assay, cardiolipin was resolved into 12 molecular species, including oxidized species and non-oxidized species with different degrees of unsaturation. All 12 species reacted under anaerobic conditions with serum from patients with primary antiphospholipid syndrome. Immune reactivity was similar for tetralinoleoyl-cardiolipin, trilinoleoyl-oleoyl-cardiolipin, and peroxycardiolipins, but somewhat lower for tristearoyl-oleoyl-cardiolipin. Oxidative treatment of cardiolipin with air, cytochrome c, or Cu2+/tert-butylhydroperoxide, either before or during the assay, did not enhance immune reactivity. Similar results were obtained with a monoclonal IgM from lupus-prone mice, that binds cardiolipin in the absence of protein cofactors. We conclude that the solid-phase assay for antiphospholipid antibodies can be supported by various oxidized and nonoxididized molecular species of cardiolipin.

 
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