Abstract
Autoimmune diseases are characterized by the presence of autoantibodies in serum of affected patients. The heterogeneity of autoimmune relevant antigens creates a variety of different antibodies, which requires a simultaneous detection mode. For this reason, we developed a tool for parallelized, label-free, optical detection that accomplishes the characterization of multiple antigen–antibody interactions within a single measurement on a timescale of minutes. Using 11-aminoundecyltrimethoxysilane, we were able to immobilize proteinogenic antigens as well as an amino-functionalized cardiolipin on a glass surface. Assay conditions were optimized for serum measurements with a single spot antigen chip on a single spot 1-λ detection system. Minimized background signal allows a differentiation between patients and healthy controls with a good sensitivity and specificity. Applying polarized imaging reflectometric interference spectroscopy, we evaluated samples from three APS patients and three control subjects for this proof-of-principle and already obtained good results for β2-glycoprotein I and cardiolipin.
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Abbreviations
- aa:
-
Amino acids
- anti-CL:
-
Cardiolipin antibody
- anti-PL:
-
Phospholipid antibody
- anti-β2-GPI:
-
β2-GPI antibodies
- anti-BSA:
-
Bovine serum albumin antibodies
- anti-PT:
-
Prothrombin antibody
- AMD:
-
Aminodextrane
- APS:
-
Antiphospholipid syndrome
- BSA:
-
Bovine serum albumin
- CCD:
-
Charge-coupled device
- CL:
-
Cardiolipin
- ELISA:
-
Enzyme-linked immunosorbent assay
- IgG:
-
Immunglobulin G
- IgM:
-
Immunglobulin M
- LED:
-
Light-emitting diode
- LA:
-
Lupus anticoagulant
- PBS:
-
Phosphate-buffered saline
- PEG:
-
Polyethylene glycol
- pi-RIfS:
-
Polarized imaging reflectometric interference spectroscopy
- PL:
-
Phospholipid
- PS:
-
Phosphatidyl serine
- PT:
-
Prothrombin
- RIfS:
-
Reflectometric interference spectroscopy
- RT:
-
Room temperature
- SD:
-
Standard deviation
- 11-AUTMS:
-
11-Aminoundecyltrimethoxysilane
- β2-GPI:
-
β2-Glycoprotein I
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Acknowledgments
We gratefully thank Dr. Peter Fechner from Biametrics GmbH for the design and fabrication of the PDMS flow cell and for providing it to us. We thank the Deutsche Forschungsgemeinschaft (DFG) for funding this project (project numbers PR1192/2-1 and LU 520/5-1).
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Published in the topical collection Multiplex Platforms in Diagnostics and Bioanalytics with guest editors Günter Peine and Günther Proll.
Oliver Bleher and Aline Schindler contributed equally to this work.
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Bleher, O., Schindler, A., Yin, MX. et al. Development of a new parallelized, optical biosensor platform for label-free detection of autoimmunity-related antibodies. Anal Bioanal Chem 406, 3305–3314 (2014). https://doi.org/10.1007/s00216-013-7504-y
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DOI: https://doi.org/10.1007/s00216-013-7504-y