Abstract
Antiphospholipid antibodies (aPL) are a relevant serological indicator of antiphospholipid syndrome (APS). A solid-state surface with covalently bound ω-amine-functionalized cardiolipin was established and the binding of β2-glycoprotein I (β2-GPI) was investigated either by use of surface plasmon resonance (SPR) biosensor, by electrically switchable DNA interfaces (switchSENSE) and by scanning tunneling microscopy (STM). STM could clearly visualize the attachment of β2-GPI to the cardiolipin surface. Using the switchSENSE sensor, β2-GPI as specific ligand could be identified by increased hydrodynamic friction. The binding of anti-cardiolipin antibodies (aCL) was detected against the ω-amine-functionalized cardiolipin-modified SPR biosensor (aCL biosensor) using sera from healthy donors, APS patients and syphilis patients. Our results showed that the aCL biosensor is a much more sensitive diagnostic device for APS patients compared to previous methods. The specificity between β2-GPI-dependent autoimmune- and β2-GPI-independent infection-associated types of aPLs was also studied and they can be distinguished by the different binding kinetics and patterns.
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Abbreviations
- aCL:
-
Anticardiolipin antibody
- aPL:
-
Antiphospholipid antibody
- APS:
-
Antiphospholipid syndrome
- AUC:
-
Area under the curve
- aβ2-GPI:
-
Anti-β2-GPI antibodies
- BB:
-
Blocking buffer
- BFP:
-
Biological false positive
- FC:
-
Flow cell
- FCS:
-
Fetal calf serum
- HBS:
-
HEPES-buffered saline
- HRP:
-
Horseradish peroxidase
- LA:
-
Lupus anticoagulant
- mAb:
-
Monoclonal antibody
- MW:
-
Molecular weight
- PBS:
-
Phosphate-buffered saline
- PL:
-
Phospholipid
- ROC:
-
Receiver operating characteristic
- RU:
-
Resonance units
- SAM:
-
Self-assembled monolayer
- SD:
-
Standard deviation
- SLE:
-
Systemic lupus erythematosus
- SPR:
-
Surface plasmon resonance
- STM:
-
Scanning tunneling microscopy
- TMB:
-
3,3′,5,5′-tetramethylbenzidine
- VDRL:
-
Venereal disease research laboratory
- WB:
-
Washing buffer
- β2-GPI:
-
β2-glycoprotein I
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Acknowledgments
The authors thank Anita Schreiegg for excellent technical assistance. This study was supported by the Stiftung Pathobiochemie und Molekulare Diagnostik of the German Society of Clinical Chemistry and Laboratory Medicine and the Australian Research Council, Discovery Project, Grant DP1094497.
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Schlichtiger, A., Baier, C., Yin, MX. et al. Covalent attachment of functionalized cardiolipin on a biosensor gold surface allows repetitive measurements of anticardiolipin antibodies in serum. Anal Bioanal Chem 405, 275–285 (2013). https://doi.org/10.1007/s00216-012-6467-8
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DOI: https://doi.org/10.1007/s00216-012-6467-8