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- W2068499152 abstract "The valve sinuses of the deep venous system are frequent sites of venous thrombus initiation. We previously reported that, in comparison with the non-valvular lumenal endothelium, the valve sinus endothelium had decreased expression of von Willebrand factor (vWF) and increased expression of endothelial protein C receptor (EPCR) and thrombomodulin (TM), suggesting alteration in the procoagulant/anticoagulant balance. We hypothesized that increased stasis in the deeper recesses of the venous valves would be associated with a gradient of increased thromboresistance. Expression of EPCR, TM, and vWF was analyzed via quantitative confocal immunofluorescence in residual saphenous veins collected following coronary artery bypass procedures. In agreement with our hypothesis, endothelial expression of vWF in the valve sinus decreased from the uppermost to the deepest region of the valve sinus. In contrast to our hypothesis, EPCR expression decreased from the uppermost to the deepest region of the valve sinus (p < 0.001) and TM expression remained unchanged throughout the valve sinus. Comparison of the non-valvular lumenal endothelium with the valve sinus endothelium demonstrated significantly decreased vWF expression (p < 0.001) in the valvular sinus consistent with our previous report; however, we did not observe statistically significant differences in EPCR or TM expression in this comparison. In addition, remarkable inter-individual variation in expression of these three proteins was also observed. These findings suggest that the genesis of these observations is more complex than predicted by our initial hypothesis, likely due, at least in part, to the complex rheology of the valvular sinus microenvironment." @default.
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- W2068499152 date "2011-02-01" @default.
- W2068499152 modified "2023-10-16" @default.
- W2068499152 title "The endothelial microenvironment in the venous valvular sinus: thromboresistance trends and inter-individual variation" @default.
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- W2068499152 doi "https://doi.org/10.1007/s00418-011-0783-5" @default.
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