Detection of antibody-mediated reduction of annexin A5 anticoagulant activity in plasmas of patients with the antiphospholipid syndrome.
Publication year
2004Source
Blood, 104, 9, (2004), pp. 2783-90ISSN
Publication type
Article / Letter to editor

Display more detailsDisplay less details
Organization
CHL
Journal title
Blood
Volume
vol. 104
Issue
iss. 9
Page start
p. 2783
Page end
p. 90
Subject
UMCN 1.2: Molecular diagnosis, prognosis and monitoringAbstract
Annexin A5 (A5) forms 2-dimensional crystals over phospholipid bilayers, blocking their availability for coagulation reactions. Recently, human antiphospholipid (aPL) monoclonal antibodies (mAbs) have been demonstrated by atomic force microscopy (AFM) to disrupt this crystallization and accelerate coagulation. We therefore performed a study with small, well-defined groups of patients to investigate whether these effects on A5 binding and activity are also detectable in plasmas from patients with the aPL syndrome. A5 binding to phospholipid was significantly reduced by plasmas of patients with the aPL syndrome and thromboembolism compared with healthy controls (mean +/- SD, 26.7 +/- 4.3 ng/well [n = 25] vs 30.5 +/- 3.1 ng/well [n = 20], P < .01) and the non-aPL thromboembolism group (29.9 +/- 3.2 ng/well [n = 15], P < .05). A5 anticoagulant activity was reduced by plasmas of patients with aPL syndrome and thromboembolism compared with aPL antibodies without thrombosis (182 +/- 31% [n = 25] vs 210 +/- 35% [n = 26], P < .01), non-aPL thromboembolism (229 +/- 16% [n = 15], P < .001), and healthy controls (231 +/- 14% [n = 30], P < .001). In conclusion, in accordance with recent AFM data with monoclonal human aPL antibodies, plasmas from patients with aPL antibodies with thromboembolism reduce both A5 binding to phospholipid and A5 anticoagulant activity. This "annexin A5 resistance" identifies a novel mechanism for thrombosis in the aPL syndrome.
This item appears in the following Collection(s)
- Academic publications [227881]
- Faculty of Medical Sciences [86219]
Upload full text
Use your RU credentials (u/z-number and password) to log in with SURFconext to upload a file for processing by the repository team.