7
IRUS TotalDownloads
Altmetric
Kallikrein directly interacts with and activates Factor IX, resulting in thrombin generation and fibrin formation independent of Factor XI
File | Description | Size | Format | |
---|---|---|---|---|
![]() | Published version | 1.67 MB | Adobe PDF | View/Open |
Title: | Kallikrein directly interacts with and activates Factor IX, resulting in thrombin generation and fibrin formation independent of Factor XI |
Authors: | Kearney, KJ Butler, J Posada, OM Wilson, C Heal, S Ali, M Hardy, L Ahnstrom, J Gailani, D Foster, R Hethershaw, E Longstaff, C Philippou, H |
Item Type: | Journal Article |
Abstract: | Kallikrein (PKa), generated by activation of its precursor prekallikrein (PK), plays a role in the contact activation phase of coagulation and functions in the kallikrein-kinin system to generate bradykinin. The general dogma has been that the contribution of PKa to the coagulation cascade is dependent on its action on FXII. Recently this dogma has been challenged by studies in human plasma showing thrombin generation due to PKa activity on FIX and also by murine studies showing formation of FIXa-antithrombin complexes in FXI deficient mice. In this study, we demonstrate high-affinity binding interactions between PK(a) and FIX(a) using surface plasmon resonance and show that these interactions are likely to occur under physiological conditions. Furthermore, we directly demonstrate dose- and time-dependent cleavage of FIX by PKa in a purified system by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and chromogenic assays. By using normal pooled plasma and a range of coagulation factor-deficient plasmas, we show that this action of PKa on FIX not only results in thrombin generation, but also promotes fibrin formation in the absence of FXII or FXI. Comparison of the kinetics of either FXIa- or PKa-induced activation of FIX suggest that PKa could be a significant physiological activator of FIX. Our data indicate that the coagulation cascade needs to be redefined to indicate that PKa can directly activate FIX. The circumstances that drive PKa substrate specificity remain to be determined. |
Issue Date: | 28-Jan-2021 |
Date of Acceptance: | 1-Jan-2021 |
URI: | http://hdl.handle.net/10044/1/86429 |
DOI: | 10.1073/pnas.2014810118 |
ISSN: | 0027-8424 |
Publisher: | National Academy of Sciences |
Start Page: | 1 |
End Page: | 9 |
Journal / Book Title: | Proceedings of the National Academy of Sciences of the United States of America |
Volume: | 118 |
Issue: | 3 |
Copyright Statement: | © 2021 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). |
Keywords: | Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics plasma kallikrein prekallikrein Factor IX intrinsic pathway Factor XII MOLECULAR-WEIGHT KININOGEN HUMAN-PLASMA PREKALLIKREIN DEFICIENCY MECHANISM MICE IDENTIFICATION HEMOSTASIS COFACTOR PROTEASE BINDING Factor IX Factor XII intrinsic pathway plasma kallikrein prekallikrein Science & Technology Multidisciplinary Sciences Science & Technology - Other Topics plasma kallikrein prekallikrein Factor IX intrinsic pathway Factor XII MOLECULAR-WEIGHT KININOGEN HUMAN-PLASMA PREKALLIKREIN DEFICIENCY MECHANISM MICE IDENTIFICATION HEMOSTASIS COFACTOR PROTEASE BINDING |
Publication Status: | Published |
Open Access location: | https://www.pnas.org/content/118/3/e2014810118.long |
Article Number: | ARTN e2014810118 |
Online Publication Date: | 2021-01-04 |
Appears in Collections: | Department of Immunology and Inflammation |
This item is licensed under a Creative Commons License