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Related Experiment Videos

Programmed cell death in the developing heart: regulation by BMP4 and FGF2.

Z Zhao1, S A Rivkees

  • 1Yale Child Health Research Center, Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut 06520, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|April 15, 2000
PubMed
Summary

Programmed cell death (apoptosis) is crucial for heart development, occurring in specific regions like the endocardial cushions and myocardium. Growth factors like BMP4 and FGF2 influence this process, impacting cardiac remodeling.

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Area of Science:

  • Developmental Biology
  • Cardiovascular Research
  • Cell Biology

Background:

  • Programmed cell death, or apoptosis, is essential for normal embryonic development.
  • Understanding apoptosis in cardiac development is critical for identifying congenital heart defects.

Purpose of the Study:

  • To investigate the role and patterns of programmed cell death (apoptosis) during murine cardiac development.
  • To explore the relationship between apoptosis, cell proliferation, and growth factor regulation in the developing heart.

Main Methods:

  • Terminal deoxynucleotidyl transferase dUTP nick end-labeling (TUNEL) assays were used to detect apoptotic cells in embryonic and early postnatal murine hearts (E9.5-P3).
  • Apoptosis patterns were compared with cell proliferation rates.
  • In vitro studies examined the effects of BMP4 and FGF2 on apoptosis in cardiac tissues.

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Main Results:

  • Apoptosis was detected in the endocardial cushions and myocardium from E11.5 to P3, with higher levels in the left ventricle.
  • Cell death was prominent in the outflow tract during conotruncal septum formation and in the atrioventricular endocardial cushions during septation.
  • Apoptosis occurred in regions with low cell proliferation and was modulated by BMP4 (inducing) and FGF2 (inhibiting).

Conclusions:

  • Programmed cell death is integral to tissue fusion and remodeling processes in the developing heart.
  • Cardiac apoptosis is spatially regulated and influenced by specific growth factors, offering insights into heart development and potential therapeutic targets.