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Developmental Basis of Adult Cardiovascular Diseases: Valvular Heart Diseases

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Specialty Science
Date 2010 Mar 6
PMID 20201901
Citations 42
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Abstract

In this chapter, we review the working hypothesis that the roots of adult valvular heart disease (VHD) lie in embryonic development. Valvulogenesis is a complex process in which growth factors signal the process of endocardium-to-mesenchyme transformation (EMT) resulting in formation of prevalvular "cushions." The post-EMT processes, whereby cushions are morphogenetically remolded into valve leaflets, are less well understood, but they require periostin. Mice with targeted deletion of periostin develop degenerative changes similar to human forms of VHD. Mitral valves are also abnormally elongated in hypertrophic cardiomyopathy (HCM), which plays an important role in clinical disease expression. However, the mechanism for this is unclear, but correlates with enhanced expression of periostin in a specific population of ventricular cells derived from the embryonic proepicardial organ, which accumulate at sites where valvular endocardial EMT is reactivated. Collectively, these findings suggest that developmental mechanisms underlie adult valve responses to genetic mutations in degenerative VHD and HCM.

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