Abstract
The primordia of valves and the atrioventricular septum arise from endocardial cushion tissue that is formed in the outflow tract (OFT) and in the atrioventricular (AV) regions during cardiogenesis. Abnormal development of the endocardial cushion results in various congenital heart diseases. Endocardial epithelial-mesenchymal transformation (EMT) is a critical process in cushion tissue formation and is regulated by many factors, such as growth factors, intercellular signaling molecules, transcription factors, and extracellular matrices. A signal that is produced by the myocardium of the AV and OFT regions and transferred to the adjacent endocardium across the extracellular matrix mediates EMT. Studies in vitro and genetic analyses have shown that transforming growth factor beta and bone morphogenetic protein play central roles in the regulation of EMT during cushion tissue formation.
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