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Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development
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Left Atrial Ligation in the Avian Embryo as a Model for Altered Hemodynamic Loading During Early Vascular Development

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Platelet-derived growth factors in the developing avian heart and maturating coronary vasculature

Nynke M S Van Den Akker1, Heleen Lie-Venema, Saskia Maas

  • 1Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|June 24, 2005
PubMed

Insights

Platelet-derived growth factors (PDGFs) are crucial for embryonic heart development. This study reveals PDGF-B and PDGFR-beta are specifically vital for avian coronary artery maturation.

Area of Science:

  • Developmental Biology
  • Cardiovascular Research
  • Molecular Biology

Background:

  • Platelet-derived growth factors (PDGFs) play essential roles in embryonic development.
  • Understanding PDGF signaling is key to elucidating heart and coronary development.
  • Avian models offer valuable insights into early cardiovascular morphogenesis.

Purpose of the Study:

  • To investigate the expression patterns of PDGF-A, PDGF-B, and their receptors (PDGFR-alpha, PDGFR-beta) in avian heart development.
  • To determine the specific roles of these proteins in myocardial and coronary development.
  • To analyze protein expression during critical stages of avian heart formation (HH 28-HH35).

Main Methods:

  • Utilized immunohistochemistry to detect protein expression.
  • Examined tissue sections from quail-chicken chimeras at Hamburger and Hamilton stages 28-35.
  • Focused on key cardiac structures including the myocardium, septa, and developing coronary vasculature.

Main Results:

  • PDGF-A and PDGFR-alpha were broadly expressed in myocardial tissues and septa.
  • PDGF-B and PDGFR-beta were localized to cardiac nerves, epicardial cells, endothelial cells, and vascular smooth muscle cells.
  • PDGF-B was present in ventricular septal development without PDGFR expression, while PDGFR-beta was found in epicardium-derived cells.

Conclusions:

  • All four investigated proteins (PDGF-A, PDGF-B, PDGFR-alpha, PDGFR-beta) are involved in avian myocardial development.
  • PDGF-B and PDGFR-beta play a specific and critical role in the maturation of the coronary vasculature.
  • The findings highlight distinct roles for PDGF family members in cardiac morphogenesis and vascularization.

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