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Related Experiment Video

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Ultrasonic Assessment of Myocardial Microstructure
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Tie2 regulates endocardial sprouting and myocardial trabeculation.

Xianghu Qu1, Cristina Harmelink1, H Scott Baldwin1,2

  • 1Department of Pediatrics (Cardiology) and.

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|May 22, 2019
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Endocardial Tie2 (tyrosine kinase with immunoglobulin-like loops 1) is crucial for heart development. Its loss causes heart defects by impairing endocardial cell sprouting and promoting cardiomyocyte overgrowth.

Keywords:
CardiologyCardiovascular diseaseDevelopmentEmbryonic developmentMouse models

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Area of Science:

  • Developmental Biology
  • Cardiovascular Biology
  • Molecular Cardiology

Background:

  • The angiopoietin-1 (Ang1)-Tie2 pathway is vital for vascular development.
  • Molecular mechanisms of Tie2 in cardiac development remain unclear.
  • Endocardial cells (ECs) and cardiomyocytes (CMs) form the heart chambers.

Purpose of the Study:

  • To elucidate the role of endocardial Tie2 in cardiac ontogeny.
  • To investigate the molecular effectors of Tie2 during heart development.
  • To understand Tie2's impact on trabeculation and cardiomyocyte proliferation.

Main Methods:

  • Generated endocardial-specific Tie2 knockout (Tie2-cko) mice.
  • Analyzed heart morphology, cell proliferation, and gene expression.
  • Utilized retinoic acid (RA) signaling inhibition (BMS493) for rescue experiments.

Main Results:

  • Endocardial Tie2 deficiency caused mid-gestation lethality with simplified, hyperplastic trabeculae.
  • Loss of Tie2 reduced EC proliferation and sprouting, hindering trabecular assembly.
  • Hypertrabeculation correlated with increased Bmp10, RA signaling, and Erk1/2 phosphorylation in CMs.

Conclusions:

  • Endocardial Tie2 supports EC proliferation and sprouting for normal trabeculation.
  • Endocardial Tie2 suppresses RA signaling in CMs to prevent hypertrabeculation.
  • Tie2 has dual roles in ventricular chamber formation: promoting EC function and inhibiting CM overgrowth.