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Related Experiment Video

Updated: May 30, 2026

Transverse Aortic Constriction in Mice
08:25

Transverse Aortic Constriction in Mice

Published on: April 22, 2010

Abnormal aortic valve development in mice lacking endothelial nitric oxide synthase.

T C Lee1, Y D Zhao, D W Courtman

  • 1Division of Cardiology, Terrence Donnelly Heart Center, St Michael's Hospital, University of Toronto, Ontario, Canada.

Circulation
|May 24, 2000
PubMed
Summary

Mice lacking endothelial nitric oxide synthase (eNOS) showed a higher incidence of bicuspid aortic valves, a common congenital heart defect. This study offers new molecular insights into cardiovascular development and abnormalities.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genetics

Background:

  • Endothelium-derived nitric oxide (NO), produced by endothelial NO synthase (eNOS), is vital for vascular homeostasis.
  • NO influences cell growth, apoptosis, vasodilation, antithrombosis, vascular remodeling, and angiogenesis.
  • Its role in embryonic cardiovascular development, particularly limb vasculature formation, is increasingly recognized.

Purpose of the Study:

  • To investigate the role of endothelium-derived NO in cardiovascular development.
  • To examine the impact of eNOS deficiency on cardiac structure and function.

Main Methods:

  • Comparative analysis of cardiac morphology in eNOS-deficient and wild-type mice.
  • Immunohistochemical examination of eNOS expression in developing and mature aortic valves.

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Last Updated: May 30, 2026

Transverse Aortic Constriction in Mice
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Transverse Aortic Constriction in Mice

Published on: April 22, 2010

Ascending Aortic Constriction in Rats for Creation of Pressure Overload Cardiac Hypertrophy Model
10:18

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Published on: June 29, 2014

Technique of Minimally Invasive Transverse Aortic Constriction in Mice for Induction of Left Ventricular Hypertrophy
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Main Results:

  • Five out of 12 mature eNOS-deficient mice presented with a bicuspid aortic valve.
  • No valvular or cardiac abnormalities were observed in 26 mature wild-type mice.
  • eNOS expression was detected in the endothelium of wild-type aortic valve cusps and embryonic valve leaflets.

Conclusions:

  • A significant association exists between eNOS deficiency and the development of bicuspid aortic valves.
  • This research provides the first molecular understanding of a common congenital cardiac abnormality.
  • Endothelium-derived NO is crucial for normal aortic valve development.