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PDGF-A is required for normal murine cardiovascular development

G C Schattemann1, C Loushin, T Li

  • 1Department of Cardiovascular Research, St. Elizabeth's Medical Center, Tufts University School of Medicine, Boston, Massachusetts 02135, USA.

Developmental Biology
|May 25, 1996
PubMed
Summary
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Platelet-derived growth factor A chain (PDGF-A) is essential for embryonic cardiovascular development. Blocking PDGF-A in mice caused severe heart abnormalities, demonstrating its critical role during specific developmental windows.

Area of Science:

  • Developmental Biology
  • Cardiovascular Science
  • Molecular Biology

Background:

  • Platelet-derived growth factor A chain (PDGF-A) is implicated in embryonic cardiovascular development.
  • Direct in vivo evidence for PDGF-A's necessity and timing in heart development is lacking.

Purpose of the Study:

  • To directly investigate the requirement of PDGF-A for normal embryonic cardiovascular development.
  • To determine the specific developmental stages at which PDGF-A is essential for cardiac formation and function.

Main Methods:

  • Administration of anti-PDGF-A neutralizing antibodies in pregnant mice at embryonic days 8.5, 9.5, and 10.5.
  • Selective disruption of PDGF-A ligand-receptor interactions in vivo.
  • Analysis of embryonic cardiovascular development 48 hours post-treatment.

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Main Results:

  • Antibody treatment led to severe cardiovascular abnormalities, including myocardial hypertrophy and epicardial/endocardial defects.
  • Heart abnormalities were observed across all treatment ages but were more prevalent with early E8.5 treatment.
  • Aortic dilation was specifically observed in embryos treated at the later stage of E10.5.

Conclusions:

  • This study provides the first direct evidence that PDGF-A is indispensable for normal embryonic cardiovascular development.
  • Identified specific cardiovascular processes, such as myocardial growth and aortic formation, that are dependent on PDGF-A.
  • Defined critical temporal windows during embryogenesis when PDGF-A signaling is required for distinct cardiovascular developmental events.