Elucidating atherosclerotic vulnerable plaque rupture by modeling cross substitution of ApoE -/- mouse and human plaque components stiffnesses

Jacques Ohayon, Nicolas Mesnier, Alexis Broisat, Jakub Toczek, Laurent Riou, Philippe Tracqui

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The structure of mouse atherosclerotic lesions may differ from that of humans, and mouse atherosclerotic plaques do not rupture except in some specific locations such as the brachiocephalic artery. Recently, our group was the first to observe that the amplitudes of in vivo stresses in ApoE -/- mouse aortic atherosclerotic lesions were much lower and differed from those found in a previous work performed on human lesions. In this previous preliminary work, we hypothesized that the plaque mechanical properties (MP) may in turn be responsible for such species differences.However, the limited number of human samples used in our previous comparative study was relevant but not sufficient to broadly validate such hypothesis. Therefore, in this study,we propose an original finite element strategy that reconstructs the in vivo stress/strain (IVS/S) distributions in ApoE -/- artherosclerotic vessels based on cross substitution of ApoE -/- mouse and human plaque components stiffnesses and including residual stress/strain (RS/S). Our results: (1) showed that including RS/S decreases by a factor 2 the amplitude of maximal IVS/S, and more importantly, (2) demonstrated that the MP of the ApoE -/- plaque constituents are mainly responsible for the low level-compared with human-of intraplaque stress in ApoE -/- mouse aortic atherosclerotic lesions (8.36 ± 2.63kPa vs. 182.25 ± 55.88kPa for human). Our study highlights that such differences in the distribution and amplitude of vessel wall stress might be one key feature for explaining for the difference in lesion stability between human coronary and mouse aortic lesions.

Original languageEnglish (US)
Pages (from-to)801-813
Number of pages13
JournalBiomechanics and Modeling in Mechanobiology
Volume11
Issue number6
DOIs
StatePublished - Jul 2012

Keywords

  • Atherosclerosis
  • Finite element analysis
  • Intraplaque stress
  • Plaque rupture
  • Residual stress
  • Vulnerable plaque

ASJC Scopus subject areas

  • Biotechnology
  • Modeling and Simulation
  • Mechanical Engineering

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