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Patterns of anti-phospholipid antibody specificities
A Gilman-Sachs1, J Lubinski, A E Beer
1Department of Microbiology and Immunology, University of Health Sciences, Chicago Medical School, IL 60064.
Journal of Clinical & Laboratory Immunology
|June 1, 1991
Summary
Testing for anti-phospholipid (PL) antibodies beyond anti-cardiolipin is crucial for diagnosing anti-phospholipid antibody syndrome (APA). Many positive cases involve antibodies to other phospholipids, not just cardiolipin.
Area of Science:
- Immunology
- Clinical Chemistry
Background:
- Anti-phospholipid antibody syndrome (APA) is associated with an increased risk of thromboembolic disease.
- Current diagnostic approaches may focus heavily on anti-cardiolipin antibodies, potentially overlooking other relevant anti-phospholipid antibodies.
Purpose of the Study:
- To evaluate the significance of testing for a broader range of anti-phospholipid (PL) antibodies in patients suspected of having APA.
- To determine the prevalence of antibodies targeting various phospholipids beyond cardiolipin in a patient cohort with potential thromboembolic disease.
Main Methods:
- Analysis of 1,513 serum samples from 399 patients at risk for thromboembolic events.
- Assay for IgM, IgG, and IgA class antibodies against six phospholipids: cardiolipin, phosphatidylserine, phosphatidylinositol, phosphatidylethanolamine, phosphatidylglycerol, and phosphatidic acid.
- Utilized ELISA with subtraction of non-specific binding and a positivity threshold of >3 standard deviations above the mean.
Main Results:
- Of the patients positive for anti-PL antibodies, approximately 60% had antibodies to phospholipids other than cardiolipin.
- For IgG antibodies, anti-phosphatidylserine antibodies were most common, followed by anti-phosphatidylethanolamine and anti-cardiolipin antibodies.
- A significant proportion of patients with APA had antibodies to multiple phospholipids.
Conclusions:
- Anti-phospholipid antibody testing should encompass a wider array of phospholipids, not solely cardiolipin, for accurate APA diagnosis.
- Identifying antibodies to phospholipids such as phosphatidylserine and phosphatidylethanolamine is critical for comprehensive APA assessment.
- Broadening the scope of anti-PL antibody assays improves the detection rate of patients with anti-phospholipid antibody syndrome.