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Related Concept Videos

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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Related Experiment Video

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En Face Endocardial Cushion Preparation for Planar Morphogenesis Analysis in Mouse Embryos
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Coordinating cardiomyocyte interactions to direct ventricular chamber morphogenesis.

Peidong Han1, Joshua Bloomekatz1, Jie Ren1

  • 1Department of Medicine, Division of Cardiology, University of California, San Diego, La Jolla, California 92093, USA.

Nature
|July 1, 2016
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Summary
This summary is machine-generated.

Cardiomyocyte assembly into heart ventricular walls involves a feedback loop between Notch and Erbb2 signaling. This process guides cell positioning, ensuring proper heart structure and function.

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Cellular Signaling

Background:

  • Heart ventricular walls have distinct compact and trabecular layers crucial for function.
  • Disruptions in myocardial wall formation cause congenital heart diseases and cardiomyopathies.
  • Mechanisms of embryonic cardiomyocyte spatial organization remain largely unknown.

Purpose of the Study:

  • To elucidate the signaling pathways governing cardiomyocyte assembly in the developing zebrafish heart.
  • To understand how myocardial Notch and Erbb2 signaling interact to direct cell positioning and morphogenesis.
  • To reveal the cellular dynamics underlying ventricular wall formation.

Main Methods:

  • Utilized advanced genetic manipulation and in vivo imaging in zebrafish models.
  • Investigated cell-autonomous and non-cell-autonomous roles of Notch and Erbb2 signaling.
  • Analyzed effects of manipulating myocardial Notch activity on ventricular morphology.

Main Results:

  • Identified a feedback loop where myocardial Notch signaling inhibits Erbb2 signaling, preventing cardiomyocyte sprouting and trabeculation.
  • Myocardial-specific Notch inactivation resulted in reduced ventricle size and thickened walls due to excessive trabeculae.
  • Widespread myocardial Notch activity led to enlarged ventricles with thin walls and absent trabeculae.
  • Erbb2-activated cardiomyocytes non-cell-autonomously activate myocardial Notch signaling.

Conclusions:

  • A novel interactive cellular feedback process between Notch and Erbb2 signaling guides cardiomyocyte assembly.
  • This signaling interplay is critical for establishing the spatial dimensions and myocardial mass of the ventricular wall.
  • Findings provide insights into the cellular dynamics of tissue morphogenesis and organ form.