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Tissue factor expression in atrial endothelia associated with nonvalvular atrial fibrillation: possible involvement in intracardiac thrombogenesis.

Abstract：

INTRODUCTION:Tissue factor plays a key role in the extrinsic coagulation pathway and is induced by inflammatory cytokines. Atrial myocarditis has been detected recently in some patients with lone atrial fibrillation. Virchow's triad of low blood flow, hypercoagulability, and endothelial dysfunction, enhances thrombus formation. The present study was designed to elucidate the role of endothelial dysfunction in thrombogenesis associated with nonvalvular atrial fibrillation. MATERIAL AND METHODS:We investigated tissue factor expression in the endothelia of left atrial appendages obtained from seven patients with nonvalvular atrial fibrillation and cardiogenic thromboembolism. Tissues were divided into 7-13 sections and compared with control specimens from four patients who died of noncardiac events. Expression of tissue factor, von Willebrand factor and tissue factor pathway inhibitor was evaluated by immunohistochemistry. RESULTS:Histopathologically, inflammatory cells infiltrated the endocardium and all seven patients showed features of persistent myocarditis. Activated T cells [15.3+/-9.4 cells/high power field (HPF, mean+/-S.D.) vs. control 2.2+/-4.4/HPF (P=0.0294)] and a few macrophages [5.1+/-8.4 cells/HPF vs. control 2.4+/-3.5 cells/HPF (P=NS)] infiltrated the endocardium. Tissue factor was overexpressed in the endothelia particularly in tissues containing inflammatory cells and denuded matrix of the endocardium, compared with the control group. Von Willebrand factor, but not tissue factor pathway inhibitor, was also overexpressed in these tissues. CONCLUSION:Tissue factor expression induced by local inflammation is involved in the pathogenesis of thrombosis in patients with nonvalvular atrial fibrillation.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Nakamura Y,Nakamura K,Fukushima-Kusano K,Ohta K,Matsubara H,Hamuro T,Yutani C,Ohe T

doi

10.1016/s0049-3848(03)00405-5

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

137-42

issue

3

eissn

0049-3848

issn

1879-2472

pii

S0049384803004055

journal_volume

111

pub_type

杂志文章

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