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Genetically hypercholesterolemic mice developed aortic valve stenosis and calcification, mimicking human disease. This finding aids understanding of aortic valve disease and potential treatments.

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Area of Science:

  • Cardiovascular Research
  • Animal Models of Disease
  • Biomedical Science

Background:

  • Hypercholesterolemia and advanced age are known risk factors for aortic valve stenosis.
  • Hypercholesterolemia is a potential therapeutic target for aortic valve stenosis.
  • This study investigates aortic valve stenosis development in a mouse model of genetic hypercholesterolemia.

Purpose of the Study:

  • To test the hypothesis that genetically hypercholesterolemic mice develop aortic valve calcification and stenosis.
  • To establish a preclinical model for studying aortic valve disease mechanisms.
  • To explore potential therapeutic targets for aortic valve stenosis.

Main Methods:

  • Utilized genetically hypercholesterolemic low-density lipoprotein receptor-deficient apolipoprotein B-100-only (LDLr(-/-)ApoB(100/100)) mice and age-matched C57Bl/6 controls.
  • Assessed aortic valve and left ventricle morphology and function using echocardiography.
  • Performed invasive hemodynamic assessment and Von Kossa staining for mineralization and superoxide detection.

Main Results:

  • Functionally significant aortic stenosis occurred in 8 of 24 LDLr(-/-)ApoB(100/100) mice, but none of the controls (P=0.01).
  • Mice with aortic stenosis exhibited increased transvalvular gradients, elevated left ventricular mass, and reduced ejection fraction.
  • Aortic valves showed abundant mineralization and increased superoxide levels in hypercholesterolemic mice.

Conclusions:

  • Hypercholesterolemic LDLr(-/-)ApoB(100/100) mice develop aortic valve calcification, oxidative stress, and functional valvular heart disease.
  • This mouse model effectively mimics the clinical syndrome of aortic valve stenosis.
  • The findings offer insights into aortic valve disease pathophysiology and potential nonsurgical treatment strategies.