Abstract
The extracellular matrix (ECM) plays a pivotal role in regulating cell shape and cell signaling, in maintaining cell–cell communication, and in controlling cell differentiation and dedifferentiation. The stiffness of a vessel is directly related to the proportion of the various ECM components. It is not surprising then that even haploinsufficiency of a single component of the ECM such as elastin or fibrillin can lead to profound developmental abnormalities and propensity to diseases of blood vessels. For example, haploinsufficiency of elastin (Williams syndrome) is associated with pulmonary and systemic stenoses and haploinsufficiency of fibrillin (Marfan syndrome) leads to aneurismal dilatation of the aorta. A variety of growth factors and cytokines regulate the production of the various components of the ECM and are in fact bound by different components of the ECM. Turnover of the ECM and release of growth factors is controlled by the balance between proteolytic enzymes such as serine elastases and matrix metalloproteinases (MMPs) and their endogenous inhibitors. So it is not surprising that abnormalities in the regulation of the ECM would contribute in a fundamental way to the pathobiology of pulmonary vascular disease leading to pulmonary arterial hypertension (PAH).
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Rabinovitch, M. (2011). Pulmonary Hypertension and the Extracellular Matrix. In: Yuan, JJ., Garcia, J., West, J., Hales, C., Rich, S., Archer, S. (eds) Textbook of Pulmonary Vascular Disease. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-87429-6_55
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