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DOI: 10.1055/a-2515-1402
Factor VIIa–Antithrombin Complexes are Increased in Asthma: Relation to the Exacerbation-Prone Asthma Phenotype
Funding This project was funded by the Polish National Science Centre (No: DEC-2013/09/B/NZ5/00758).

Abstract
Background Asthma is associated with a prothrombotic state. Plasma factor VIIa–antithrombin complex (FVIIa-AT) concentrations indirectly reflect the interaction of tissue factor (TF) with FVII. Since TF is a key initiator of coagulation in vivo, we hypothesized that FVIIa-AT concentrations are higher in asthma.
Methods In 159 clinically stable adult asthma patients and 62 controls, we determined FVIIa-AT in plasma and analyzed their relation to circulating inflammatory and prothrombotic markers together with the total plasma potential for fibrinolysis (clot lysis time, CLT) and thrombin generation. We recorded clinical outcomes, including asthma exacerbations, during 3-year follow-up.
Results Asthma patients were characterized by 38.5% higher FVIIa-AT (p < 0.001), related to bronchial obstruction (FEV1: r = −0.397, p < 0.001), asthma severity (r = 0.221, p = 0.005), and duration (r = 0.194, p = 0.015) compared to controls. FVIIa-AT showed weak positive associations with C-reactive protein (r = 0.208, p = 0.009), fibrinogen (r = 0.215, p = 0.007), and CLT (r = 0.303, p < 0.001) but not with thrombin generation parameters. In the follow-up (data obtained from 151 patients), we documented 151 severe asthma exacerbations in 51 (33.8%) patients, including 33 (21.9%) with ≥2 such events. Exacerbation-prone asthma phenotype was related to 13.1% higher FVIIa-AT (p = 0.012), along with asthma severity and control (p < 0.003, both). High FVIIa-AT (that is ≥100.1 pmol/L), defined on receiver operating characteristic curves, was linked to exacerbation-prone asthma phenotype (odds ratio 1.85; 95%CI: 1.23–2.80, p = 0.003) and shorter time to first exacerbation (p = 0.023).
Conclusion This study is the first to show that FVIIa-AT concentrations are higher in asthma in relation to its severity and may help identify individuals at risk of the exacerbation-prone asthma phenotype.
Data Availability Statement
The data sets are available from the corresponding author on a reasonable request.
Authors' Contribution
A.C., L.C., and S.B-S. recruited the patients and analyzed clinical data. L.M. and A.U. conceived and designed the study. T.I., B.J., and M.Z. performed the experiments and interpreted the laboratory data. L.Z. did statistical analysis. A.U. and S.B-S. interpreted all data. S.B-S., B.J., and A.U. drafted the manuscript; all the other authors revised it critically. All authors approved the final version of the manuscript and agreed to be responsible for their aspects of the work.
Publikationsverlauf
Eingereicht: 09. Oktober 2024
Angenommen: 12. Januar 2025
Accepted Manuscript online:
13. Januar 2025
Artikel online veröffentlicht:
31. Januar 2025
© 2025. Thieme. All rights reserved.
Georg Thieme Verlag KG
Oswald-Hesse-Straße 50, 70469 Stuttgart, Germany
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