Abstract
It is becoming clear that converging pathways coordinate early heart valve development and remodeling into functional valve leaflets. The integration of these pathways begins with macro and molecular interactions outside the cell in the extracellular matrix separating the myocardial and endocardial tissue components of the rudimentary heart. Such interactions regulate events at the cell surface through receptors, proteases, and other membrane molecules which in turn transduce signals into the cell. These signals trigger intracellular cascades that transduce cellular responses through both transcription factor and cofactor activation mediating gene induction or suppression. Chamber septation and valve formation occur from these coordinated molecular events within the endocardial cushions to sustain unidirectional blood flow and embryo viability. This review discusses the emerging connection between extracellular matrix and growth factor receptor signaling during endocardial cushion morphogenesis by highlighting the extracellular component, hyaluronan, and erbB receptor functions during early valve development.
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Abbreviations
- AV :
-
Atrioventricular
- BMP :
-
Bone morphogenetic protein
- CHD :
-
Congenital heart defects
- ECM :
-
Extracellular matrix
- EGF :
-
Epidermal growth factor
- EGFR :
-
Epidermal growth factor receptor
- EMT :
-
Epithelial to mesenchymal transformation
- ERK :
-
Extracellular signal regulated kinase
- HA :
-
Hyaluronan
- Has :
-
Hyaluronan synthase
- HB :
-
Heparin-binding
- HRG :
-
Heregulin
- HSPG :
-
Heparan sulfate proteoglycan
- MAP :
-
Mitogen-activated protein
- OFT :
-
Outflow tract
- TACE :
-
Tumor necrosis factor α converting enzyme
- TGF :
-
Transforming growth factor
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Acknowledgements
We appreciate the sharing of unpublished observations by the indicated investigators. We thank Dr. S. Klewer for the type VI collagen images and T. Biazo for graphics support. We thank Drs. J. McDonald and R. Runyan for support. T.D.C. is supported by the American Heart Association and the PANDA Foundation of Arizona.
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Schroeder, J.A., Jackson, L.F., Lee, D.C. et al. Form and function of developing heart valves: coordination by extracellular matrix and growth factor signaling. J Mol Med 81, 392–403 (2003). https://doi.org/10.1007/s00109-003-0456-5
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DOI: https://doi.org/10.1007/s00109-003-0456-5