Journal ArticleDOI
Hemodynamic shear stress and its role in atherosclerosis.
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TLDR
The functional regulation of the endothelium by local hemodynamic shear stress provides a model for understanding the focal propensity of atherosclerosis in the setting of systemic factors and may help guide future therapeutic strategies.Abstract:
Atherosclerosis, the leading cause of death in the developed world and
nearly the leading cause in the developing world, is associated with systemic
risk factors including hypertension, smoking, hyperlipidemia, and diabetes
mellitus, among others. Nonetheless, atherosclerosis remains a geometrically
focal disease, preferentially affecting the outer edges of vessel bifurcations.
In these predisposed areas, hemodynamic shear stress, the frictional force
acting on the endothelial cell surface as a result of blood flow, is weaker
than in protected regions. Studies have identified hemodynamic shear stress
as an important determinant of endothelial function and phenotype. Arterial-level
shear stress (>15 dyne/cm2) induces endothelial quiescence and
an atheroprotective gene expression profile, while low shear stress (<4
dyne/cm2), which is prevalent at atherosclerosis-prone sites, stimulates
an atherogenic phenotype. The functional regulation of the endothelium by
local hemodynamic shear stress provides a model for understanding the focal
propensity of atherosclerosis in the setting of systemic factors and may help
guide future therapeutic strategies.read more
Citations
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Shear stress, arterial identity and atherosclerosis
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Hemodynamic–morphological discriminant models for intracranial aneurysm rupture remain stable with increasing sample size
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In Vitro Assessment of Flow Patterns and Turbulence Intensity in Prosthetic Heart Valves Using Generalized Phase-Contrast MRI
John-Peder Escobar Kvitting,Petter Dyverfeldt,Andreas Sigfridsson,Stefan Franzén,Lars Wigström,Ann F. Bolger,Ann F. Bolger,Tino Ebbers +7 more
TL;DR: To assess in vitro the three‐dimensional mean velocity field and the extent and degree of turbulence intensity in different prosthetic heart valves using a generalization of phase‐contrast MRI (PC‐MRI).
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Volumetric quantification of absolute local normalized helicity in patients with bicuspid aortic valve and aortic dilatation.
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References
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Journal ArticleDOI
Atherosclerosis — An Inflammatory Disease
TL;DR: Atherosclerosis is an inflammatory disease as discussed by the authors, and it is a major cause of death in the United States, Europe, and much of Asia, despite changes in lifestyle and use of new pharmacologic approaches to lower plasma cholesterol concentrations.
Journal ArticleDOI
The obligatory role of endothelial cells in the relaxation of arterial smooth muscle by acetylcholine
TL;DR: It is demonstrated that relaxation of isolated preparations of rabbit thoracic aorta and other blood vessels by ACh requires the presence of endothelial cells, and that ACh, acting on muscarinic receptors of these cells, stimulates release of a substance(s) that causes relaxation of the vascular smooth muscle.
Journal ArticleDOI
Vascular endothelial cells synthesize nitric oxide from L-arginine.
TL;DR: It is demonstrated that NO can be synthesized from L-arginine by porcine aortic endothelial cells in culture and the strict substrate specificity of this reaction suggests that L- arginine is the precursor for NO synthesis in vascular endothelium cells.
Journal ArticleDOI
The pathogenesis of coronary artery disease and the acute coronary syndromes (1).
TL;DR: The two hypotheses to explain the pathogenesis of atherosclerosis, the "incrustation" hypothesis and the "lipid" hypothesis, are now known.