Development and characterization of single‐domain antibodies neutralizing protease nexin‐1 as tools to increase thrombin generation - Archive ouverte HAL Access content directly
Journal Articles Journal of Thrombosis and Haemostasis Year : 2020

Development and characterization of single‐domain antibodies neutralizing protease nexin‐1 as tools to increase thrombin generation

(1, 2) , (2) , (1) , (2) , (2) , (2) , (1) , (1) , (2) , (1)
1
2

Abstract

Background: Protease nexin-1 (PN-1) is a member of the serine protease inhibitor (Serpin)-family, with thrombin as its main target. Current polyclonal and monoclonal antibodies against PN-1 frequently cross-react with Plasminogen activator inhibitor-1 (PAI-1), a structurally and functionally homologous Serpin. Objectives: Here, we aimed to develop inhibitory single-domain antibodies (VHHs) that show specific binding to both human (hPN-1) and murine (mPN-1) PN-1. Methods: PN-1-binding VHHs were isolated via phage-display using llama-derived or synthetic VHH-libraries. Following bacterial expression, purified VHHs were analyzed in binding and activity assays. Results and Conclusions: By using a llama-derived library, 2 PN-1 specific VHHs were obtained (KB-PN1-01 & KB-PN1-02). Despite their specificity, none displayed inhibitory activity towards hPN-1 or mPN-1. From the synthetic library, 4 VHHs (H12, B11, F06, A08) could be isolated that combined efficient binding to both hPN-1 and mPN-1 with negligible binding to PAI-1. Of these, B11, F06 and A08 were able to fully restore thrombin activity by blocking PN-1. As monovalent VHH, IC50-values for hPN-1 were 50±10 nM, 290±30 and 960±390 nM, for B11, F06 and A08, respectively, and 1580±240 nM, 560±130 nM and 2880±770 nM for mPN-1. The inhibitory potential was improved 4- to 7-fold when bivalent VHHs were engineered. Importantly, all VHHs could block PN-1 activity in plasma as well as PN-1 released from activated platelets, one of the main sources of PN-1 during hemostasis. In conclusion, we report the generation of inhibitory anti-PN-1 antibodies using a specific approach to avoid cross-reactivity with the homologous Serpin PAI-1.
Fichier principal
Vignette du fichier
Kawecki et al.pdf (2.64 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

inserm-02934843 , version 1 (09-09-2020)

Identifiers

Cite

Charlotte Kawecki, Karen Aymonnier, Stephen Ferrière, Laurence Venisse, Véronique Arocas, et al.. Development and characterization of single‐domain antibodies neutralizing protease nexin‐1 as tools to increase thrombin generation: Single-domain antibodies against protease nexin-1. Journal of Thrombosis and Haemostasis, 2020, 18, pp.2155-2168. ⟨10.1111/jth.14940⟩. ⟨inserm-02934843⟩
127 View
139 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More