Abstract
Patients with hereditary or acquired haemophilia A may develop inhibitory factor VIII (FVIII) antibodies. These disrupt FVIII activity predominantly by preventing the formation of the tenase complex, leading to a serious bleeding disorder. Antibodies without inhibiting activity, however, can also be found when screening patients with haemophilia A under FVIII supplementation. Therefore, the detection of only these allo- or autoantibodies from plasma is not sufficient. Rather, the characterization of the antibody-induced effects on the coagulation cascade should be considered due to its great diagnostic importance. Currently, inhibitory activities are detected by the functional Bethesda assay, which directly measures the delay in clotting time by the patient plasma. However, this assay does not provide information on the cause of the inhibition. Here, we report the development of a surface plasmon resonance (SPR) biosensor that has the potential to integrate both quantitative and functional information on patient antibody characteristics in one measurement. Recombinant FVIII protein was immobilized on the sensor surface to detect antibodies from patient plasma. The interaction of the FIX- and FXa-clotting proteins with the formed anti-FVIII/FVIII complex could be detected subsequently within the same SPR measurement cycle. Inhibitory antibodies led to the prevention of these interactions. Thus, discrimination between the clinically relevant inhibitory and non-inhibitory antibodies was enabled. In a group of 16 patients with inhibitory antibodies (both ELISA- and Bethesda-positive), 5 patients with non-inhibitory antibodies (ELISA-positive but Bethesda-negative) and 12 healthy controls, diagnostic sensitivity and specificity data of 100 % for the FIX interaction were achieved using this biomimetic biosensor approach. The new method allows for detection and quantification, as well as for evaluation of inhibitory activity of allo- and autoantibodies, using small sample volume and short analysis time.
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Abbreviations
- Anti-FVIII:
-
Antibody against FVIII
- AUC:
-
Area under the curve
- BDD:
-
B-domain-deleted
- BU:
-
Bethesda units
- CV:
-
Coefficient of variation
- EDC:
-
1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide
- FC:
-
Flow cell
- FIX:
-
Factor IX
- FL:
-
Full length
- FVIII:
-
Factor VIII
- FXa:
-
Activated factor Xa
- NHS:
-
N-Hydroxysuccinimide
- ROC:
-
Receiver operating characteristic
- RU:
-
Resonance units
- SPR:
-
Surface plasmon resonance
- vWF:
-
von Willebrand factor
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Acknowledgments
We thank Mareike Mentzel for skillful technical support. We are also greatly indebted to Dr. Evangeline Thaler and Chris Beaudoin for reviewing the manuscript.
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Kocot, C., Schindler, A.R., Le Blanc, A. et al. Biomimetic biosensor to distinguish between inhibitory and non-inhibitory factor VIII antibodies. Anal Bioanal Chem 407, 5685–5693 (2015). https://doi.org/10.1007/s00216-015-8751-x
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DOI: https://doi.org/10.1007/s00216-015-8751-x