Abstract
Heart valves reside in one of the most mechanically demanding environments within the body, experiencing over 100,000 cycles daily of a combination of biomechanical and hemodynamic forces. The forces applied to heart valves are critical for proper valvulogenesis and normal valve function and maintenance, but disruptions in the mechanical environment can lead to developmental defects and disease. In this chapter, we review current understanding of the roles of hemodynamic forces in valve development, from the initiation of valvulogenesis by cardiac jelly formation, to the invasion of cells into the cardiac cushion through the process of endothelial-to-mesenchymal transition (EndMT) and subsequent remodeling of the extracellular matrix to give rise to the tri-layered structure of developed valves. We also review growing evidence that implicates shear stress, cyclic strain, and matrix mechanics in regulating the initiation and progression of calcific aortic valve disease (CAVD), the most common adult valve disease for which there currently is no medical therapy. An improved understanding of how mechanical forces regulate valve development and disease is expected to help identify therapeutic targets for the treatment of adult valve diseases and to guide the design of living tissue replacement valves for patients with congenital valve defects or diseased valves.
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Zhong, A., Simmons, C.A. (2016). Heart Valve Mechanobiology in Development and Disease. In: Chien, S., Engler, A., Wang, P. (eds) Molecular and Cellular Mechanobiology. Physiology in Health and Disease. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-5617-3_12
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