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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Arthritis+Rheumatol
2015 ; 67
(11
): 2990-3003
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English Wikipedia
Release of neutrophil extracellular traps by neutrophils stimulated with
antiphospholipid antibodies: a newly identified mechanism of thrombosis in the
antiphospholipid syndrome
#MMPMID26097119
Yalavarthi S
; Gould TJ
; Rao AN
; Mazza LF
; Morris AE
; Núñez-Álvarez C
; Hernández-Ramírez D
; Bockenstedt PL
; Liaw PC
; Cabral AR
; Knight JS
Arthritis Rheumatol
2015[Nov]; 67
(11
): 2990-3003
PMID26097119
show ga
OBJECTIVE: Antiphospholipid antibodies (aPL), especially those targeting ?2
-glycoprotein I (?2 GPI), are well known to activate endothelial cells,
monocytes, and platelets, with prothrombotic implications. In contrast, the
interaction of aPL with neutrophils has not been extensively studied. Neutrophil
extracellular traps (NETs) have recently been recognized as an important
activator of the coagulation cascade, as well as an integral component of
arterial and venous thrombi. This study was undertaken to determine whether aPL
activate neutrophils to release NETs, thereby predisposing to the arterial and
venous thrombosis inherent in the antiphospholipid syndrome (APS). METHODS:
Neutrophils, sera, and plasma were prepared from patients with primary APS
(n?=?52) or from healthy volunteers and characterized. No patient had concomitant
systemic lupus erythematosus. RESULTS: Sera and plasma from patients with primary
APS had elevated levels of both cell-free DNA and NETs, as compared to healthy
volunteers. Freshly isolated neutrophils from patients with APS were predisposed
to high levels of spontaneous NET release. Further, APS patient sera, as well as
IgG purified from APS patients, stimulated NET release from control neutrophils.
Human aPL monoclonal antibodies, especially those targeting ?2 GPI, also enhanced
NET release. The induction of APS NETs was abrogated with inhibitors of reactive
oxygen species formation and Toll-like receptor 4 signaling. Highlighting the
potential clinical relevance of these findings, APS NETs promoted thrombin
generation. CONCLUSION: Our findings indicate that NET release warrants further
investigation as a novel therapeutic target in APS.