title: Relationship between hemodynamics and atherosclerosis in aortic arches of apolipoprotein E-null mice on 129S6/SvEvTac and C57BL/6J genetic backgrounds.
abstract: OBJECTIVE
  We investigated the relationships between hemodynamics and differential plaque development at the aortic arch of apolipoprotein E (apoE)-null mice on 129S6/SvEvTac (129) and C57BL/6J (B6) genetic backgrounds.
  
  
  METHODS
  Mean flow velocities at the ascending and descending aorta (mVAA and mVDA) were measured by Doppler ultrasound in wild type and apoE-null male mice at 3 and 9 months of age. Following dissection of the aortic arches, anatomical parameters and plaque areas were evaluated.
  
  
  RESULTS
  Arch plaques were five times bigger in 129-apoE than in B6-apoE mice at 3 months, and twice as large at 9 months. The geometric differences, namely larger vessel diameter in the B6 strain and broader inner curvature of the aortic arch in the 129 strain, were exaggerated in 9-month-old apoE-null mice. Cardiac output and heart rate under anesthesia were significantly higher in the B6 strain than in the 129 strain. The values of mVAA were similar in the two strains, while mVDA was lower in the 129 strain. However, there was a 129-apoE-specific reduction of flow velocities with age, and both mVAA and mVDA were significantly lower in 129-apoE than in B6-apoE mice at 9 months. The mean relative wall shear stress (rWSS) over the aortic arch in 129-apoE and B6-apoE mice were not different, but animals with lower mean rWSS had larger arch plaques within each strain.
  
  
  CONCLUSIONS
  The plaque formation in the arch of apoE-null mice is accompanied by strain-dependent changes in both arch geometry and hemodynamics. While arch plaque sizes negatively correlate with mean rWSS, additional factors are necessary to account for the strain differences in arch plaque development.
authors.affiliation: Department of Pathology and Laboratory Medicine, The University of North Carolina at Chapel Hill, CB #7525, 701 Brinkhous-Bullitt Building, Chapel Hill, NC 27599-7525, USA.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tomita
authors.forename: John
authors.initials: J
authors.lastname: Hagaman
authors.forename: Morton H
authors.initials: MH
authors.lastname: Friedman
authors.forename: Nobuyo
authors.initials: N
authors.lastname: Maeda
mesh_terms: D000367:Age Factors; D000375:Aging; D000818:Animals; D001013:Aorta, Thoracic / Q000000981:diagnostic imaging / Q000473:pathology / Q000503:physiopathology*; D001018:Aortic Diseases / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology*; D001057:Apolipoproteins E / Q000172:deficiency* / Q000235:genetics; D050197:Atherosclerosis / Q000175:diagnosis / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology*; D001783:Blood Flow Velocity; D004195:Disease Models, Animal; D018450:Disease Progression; D020022:Genetic Predisposition to Disease; D006439:Hemodynamics / Q000235:genetics; D008297:Male; D051379:Mice; D057507:Mice, 129 Strain; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D012039:Regional Blood Flow; D013045:Species Specificity; D013314:Stress, Mechanical; D018608:Ultrasonography, Doppler
chemical_list: D001057:Apolipoproteins E
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