Publications associées à Arterial wall response to ex vivo exposure to oscillatory shear stress

Compliance-matching vascular grafts with personalization potential

Aortic diseases are characterized by dire prognosis and inadequate diagnosis, owing to their insidious yet lethal nature. Aortopathies, namely aortic aneurysms and dissections, along with certain congenital diseases, might necessitate surgical replacement ...

EPFL2023

Impact and implications of mixed plaque class in automated characterization of complex atherosclerotic lesions

Yanan Niu

Atherosclerosis is a complex disease altering vasculature morphology, and subsequently flow, with progressive plaque formation, mural disruption, and lumen occlusion. Determination of clinically-relevant plaque components-particularly calcium, lipid, and f ...

PERGAMON-ELSEVIER SCIENCE LTD2022

Assessment of Stiffness of Large to Small Arteries in Multistage Renal Disease Model: A Numerical Study

Nikolaos Stergiopoulos, Patrick Segers, Vasiliki Bikia

Arterial stiffness (AS), as assessed via pulse wave velocity (PWV), is a major biomarker for cardiovascular risk assessment in patients with chronic kidney disease (CKD). However, the mechanisms responsible for the changes in PWV in the presence of kidney ...

FRONTIERS MEDIA SA2022

Considerations for analysis of endothelial shear stress and strain in FSI models of atherosclerosis

Lydia Aslanidou, Fotios Savvopoulos

Atherosclerosis is a lipid driven chronic inflammatory disease that is characterized by the formation of plaques at predilection sites. These predilection sites (side branches, curved segments, and bifurcations) have often been associated with disturbed sh ...

ELSEVIER SCI LTD2021

The effect of left ventricular contractility on arterial hemodynamics: A model-based investigation

Nikolaos Stergiopoulos, Stamatia Zoi Pagoulatou, Vasiliki Bikia, Georgios Rovas

Ventricular-arterial coupling is a major determinant of cardiovascular performance, however, there are still inherent difficulties in distinguishing ventricular from vascular effects on arterial pulse phenotypes. In the present study, we employed an extens ...

2021

Optical Characterization of an Intra-Arterial Light and Drug Delivery System for Photodynamic Therapy of Atherosclerotic Plaque

Hubert van den Bergh, Georges Wagnières, Matthieu Philippe Emmanuel Zellweger, Andreas Pitzschke, Manish Jain, Ying Xiao

Although the versatility of photodynamic therapy (PDT) is well established, the technical aspects of light delivery systems vary significantly depending on the targeted organ. This article describes the optical properties of a light and drug delivery syste ...

2020

A 1D computer model of the arterial circulation in horses: An important resource for studying global interactions between heart and vessels under normal and pathological conditions

Nikolaos Stergiopoulos, Patrick Segers

Arterial rupture in horses has been observed during exercise, after phenylephrine administration or during parturition (uterine artery). In human pathophysiological research, the use of computer models for studying arterial hemodynamics and understanding n ...

2019

Photodynamic therapy for the treatment of atherosclerotic plaque: Lost in translation?

Hubert van den Bergh, Georges Wagnières, Matthieu Philippe Emmanuel Zellweger, Manish Jain

Acute coronary syndrome is a life-threatening condition of utmost clinical importance, which, despite recent progress in the field, is still associated with high morbidity and mortality. Acute coronary syndrome results from a rupture or erosion of vulnerab ...

Wiley2017

Alamandine abrogates neutrophil degranulation in atherosclerotic mice

Nikolaos Stergiopoulos, Rodrigo Araujo Fraga Da Silva

Background Neutrophil-mediated inflammation was recently identified as an active contributor to athero-progression. Therapeutic strategies inhibiting neutrophil degranulation or recruitment were hypothesized to positively impact on plaque vulnerability. In ...

Wiley-Blackwell2017

Intra-Arterial Drug and Light Delivery for Photodynamic Therapy Using Visudyne (R): Implication for Atherosclerotic Plaque Treatment

Hubert van den Bergh, Georges Wagnières, Matthieu Philippe Emmanuel Zellweger, Manish Jain

Photodynamic therapy (PDT), which is based on the activation of photosensitizers with light, can be used to reduce plaque burden. We hypothesized that intra-arterial photosensitizer administration and photo-activation will lead to high and rapid accumulati ...

2016

Assessment of shear stress related parameters in the carotid bifurcation using mouse-specific FSI simulations

Patrick Segers, Bram Trachet

The ApoE(-/-) mouse is a common small animal model to study atherosclerosis, an inflammatory disease of the large and medium sized arteries such as the carotid artery. It is generally accepted that the wall shear stress, induced by the blood flow, plays a ...

Elsevier Sci Ltd2016

Treatment with the GPR55 antagonist CID16020046 increases neutrophil activation in mouse atherogenesis

Nikolaos Stergiopoulos

Endocannabinoids modulate atherogenesis by triggering different receptors. Recently, orphan G protein-coupled receptors (GPRs) were suggested to be activated by endocannabinoids, possibly regulating vasorelaxation. Here, we investigated whether GPR55 antag ...

Schattauer Gmbh-Verlag Medizin Naturwissenschaften2016

Parallel Algorithms for the Solution of Large-Scale Fluid-Structure Interaction Problems in Hemodynamics

Davide Forti

This thesis addresses the development and implementation of efficient and parallel algorithms for the numerical simulation of Fluid-Structure Interaction (FSI) problems in hemodynamics. Indeed, hemodynamic conditions in large arteries are significantly aff ...

EPFL2016

Ultrafast laser ablation for targeted atherosclerotic plaque removal

Laurent Descloux, Demetri Psaltis, Thomas Jean Victor Marie Lanvin, Donald Benjaman Conkey

Coronary artery disease, the main cause of heart disease, develops as immune cells and lipids accumulate into plaques within the coronary arterial wall. As a plaque grows, the tissue layer (fibrous cap) separating it from the blood flow becomes thinner and ...

Spie-Int Soc Optical Engineering2015

Vulnerable Plaque Detection and Quantification with Gold Particle-Enhanced Computed Tomography in Atherosclerotic Mouse Models

Patrick Segers, Bram Trachet

Recently, an apolipoprotein E-deficient (ApoE(-/-)) mouse model with a mutation (C1039G+/-) in the fibrillin-1 (Fbn1) gene (ApoE(-/-)Fbn1(C1039G+/-) mouse model) was developed showing vulnerable atherosclerotic plaques, prone to rupture, in contrast to the ...

B C Decker Inc2015

Diminazene enhances stability of atherosclerotic plaques in ApoE-deficient mice

Nikolaos Stergiopoulos, Rafaela Fernandes Da Silva, Fabiana Pereira Da Costa Fraga, Maiia Bragina

Angiotensin (Ang) II contributes to the development of atherosclerosis, while Ang-(1-7) has atheroprotective actions. Accordingly, angiotensin-converting enzyme 2 (ACE2), which breaks-down Aug 11 and forms Ang-(1-7), has been suggested as a target against ...

Elsevier2015

Update on the role of angiotensin in the pathophysiology of coronary atherothrombosis

Nikolaos Stergiopoulos, Rodrigo Araujo Fraga Da Silva

BackgroundCoronary atherothrombosis due to atherosclerotic plaque rupture or erosion is frequently associated with acute coronary syndromes (ACS). Significant efforts have been made to elucidate the pathophysiological mechanisms underlying acute coronary e ...

Wiley-Blackwell2015

Anti-apoA-1 auto-antibodies increase mouse atherosclerotic plaque vulnerability, myocardial necrosis and mortality triggering TLR2 and TLR4

Nikolaos Stergiopoulos

Auto-antibodies to apolipoprotein A-1 (anti-apoA-1 IgG) were shown to promote inflammation and atherogenesis, possibly through innate immune receptors signalling. Here, we aimed at investigating the role of Toll-like receptors (TLR) 2 and 4 on anti-apoA-1 ...

Schattauer Gmbh-Verlag Medizin Naturwissenschaften2015

Nicotinamide phosphoribosyltransferase inhibition reduces intraplaque CXCL1 production and associated neutrophil infiltration in atherosclerotic mice

Nikolaos Stergiopoulos, Rafaela Fernandes Da Silva, Katia Galan

Pharmacological treatments targeting CXC chemokines and the associated neutrophil activation and recruitment into atherosclerotic plaques hold promise for treating cardiovascular disorders. Therefore, we investigated whether FK866, a nicotinamide phosphori ...

Schattauer2014

Treatment with Angiotensin-(1-7) reduces inflammation in carotid atherosclerotic plaques

Nikolaos Stergiopoulos, Rafaela Fernandes Da Silva, Luciano Dos Santos Aggum Capettini, Fabiana Pereira Da Costa Fraga, Katia Galan

Angiotensin (Ang)-(1-7), acting through the receptor Mas, has athero-protective effects; however, its role on plaque vulnerability has been poorly studied. Here, we investigated the expression of the renin-angiotensin system (RAS) components in stable and ...

Schattauer2014