Assessing low levels of mechanical stress in aortic atherosclerotic lesions from apolipoprotein E-/- mice-brief report

Alexis Broisat, Jakub Toczek, Nicolas Mesnier, Philippe Tracqui, Catherine Ghezzi, Jacques Ohayon, Laurent M. Riou

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Objective- Despite the fact that mechanical stresses are well recognized as key determinants for atherosclerotic plaque rupture, very little is known about stress amplitude and distribution in atherosclerotic lesions, even in the standard apolipoprotein E (apoE-/-) mouse model of atherosclerosis. Our objectives were to combine immunohistology, atomic force microscopy measurements, and finite element computational analysis for the accurate quantification of stress amplitude and distribution in apoE-/- mouse aortic atherosclerotic lesions. Methods and Results- Residual stresses and strains were released by radially cutting aortic arch segments from 7- to 30-week-old pathological apoE-/- (n=25) and healthy control mice (n=20). Immunohistology, atomic force microscopy, and biomechanical modeling taking into account regional residual stresses and strains were performed. Maximum stress values were observed in the normal arterial wall (276±71 kPa), whereas low values (<20 kPa) were observed in all plaque areas. Stress distribution was not correlated to macrophage infiltration. Conclusion- Low mechanical stress amplitude was observed in apoE-/- mouse aortic atherosclerotic lesions. This original study provides a basis for further investigations aimed at determining whether low stress levels are responsible for the apparently higher stability of murine aortic atherosclerotic lesions.

Original languageEnglish (US)
Pages (from-to)1007-1010
Number of pages4
JournalArteriosclerosis, Thrombosis, and Vascular Biology
Volume31
Issue number5
DOIs
StatePublished - May 2011

Keywords

  • atherosclerosis
  • mechanical stress

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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