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Multiple growth factors regulate coronary embryonic vasculogenesis.
R J Tomanek1, W Zheng, K G Peters
1Department of Anatomy and Cell Biology, and The Cardiovascular Center, University of Iowa, Iowa City, Iowa 52242, USA. robert-tomanek@uiowa.edu
Summary
Coronary vascularization involves multiple growth factors. Basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) interact to regulate tube formation, with TGF-beta having an inhibitory effect.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Angiogenesis Research
Background:
- Mechanisms of coronary vascularization are not fully understood.
- Growth factors play a crucial role in blood vessel formation.
Purpose of the Study:
- To investigate the roles and interactions of key growth factors in regulating coronary vascular tube formation (vasculogenesis).
- To elucidate the signaling pathways involved in embryonic heart vascularization.
Main Methods:
- Utilized a quail embryonic ventricle model in collagen gels.
- Incubated explants with specific growth factors (bFGF, VEGF, angiopoietins, TGF-beta) or their neutralizing antibodies and inhibitors (genistein, soluble Tie-2).
- Quantified vascular tube formation and endothelial cell behavior (assembly and proliferation).
Main Results:
- Vasculogenesis was dependent on tyrosine kinase receptors and inhibited by genistein.
- bFGF and VEGF synergistically promoted tube formation, with bFGF primarily affecting endothelial cell proliferation and VEGF affecting endothelial cell assembly.
- Neutralizing antibodies against bFGF or VEGF, or soluble Tie-2, significantly attenuated tube formation, highlighting their interdependence.
- Transforming growth factor-beta (TGF-beta) inhibited tube formation, while its neutralization enhanced it.
Conclusions:
- Multiple growth factors, including bFGF, VEGF, and angiopoietins, interact to regulate coronary vascular tube formation.
- The study demonstrates the complex interplay between growth factors and their receptors in embryonic heart vascularization.
- These findings provide novel insights into the molecular mechanisms governing coronary development and potential therapeutic targets for vascular diseases.