Journal of Molecular Medicine

, 87:17

Molecular mechanisms underlying the onset of degenerative aortic valve disease

  • Daihiko Hakuno
  • Naritaka Kimura
  • Masatoyo Yoshioka
  • Keiichi Fukuda
Review

DOI: 10.1007/s00109-008-0400-9

Cite this article as:
Hakuno, D., Kimura, N., Yoshioka, M. et al. J Mol Med (2009) 87: 17. doi:10.1007/s00109-008-0400-9

Abstract

Morbidity from degenerative aortic valve disease is increasing worldwide, concomitant with the ageing of the general population and the habitual consumption of diets high in calories and cholesterol. Immunohistologic studies have suggested that the molecular mechanism occurring in the degenerate aortic valve resembles that of atherosclerosis, prompting the testing of HMG CoA reductase inhibitors (statins) for the prevention of progression of native and bioprosthetic aortic valve degeneration. However, the effects of these therapies remain controversial. Although the molecular mechanisms underlying the onset of aortic valve degeneration are largely unknown, research in this area is advancing rapidly. The signaling components involved in embryonic valvulogenesis, such as Wnt, TGF-β1, BMP, and Notch, are also involved in the onset of aortic valve degeneration. Furthermore, investigations into extracellular matrix remodeling, angiogenesis, and osteogenesis in the aortic valve have been reported. Having noted avascularity of normal cardiac valves, we recently identified chondromodulin-I (chm-I) as a crucial anti-angiogenic factor. The expression of chm-I is restricted to cardiac valves from late embryogenesis to adulthood in the mouse, rat, and human. In human degenerate atherosclerotic valves, the expression of vascular endothelial growth factor (VEGF) and matrix metalloproteinases and angiogenesis is observed in the area of chm-I downregulation. Gene targeting of chm-I resulted in VEGF expression, angiogenesis, and calcification in the aortic valves of aged mice, and aortic stenosis is detected by echocardiography, indicating that chm-I is a crucial factor for maintaining normal cardiac valvular function by preventing angiogenesis. The present review focuses on the animal models of aortic valve degeneration and recent studies on the molecular mechanisms underlying the onset of degenerative aortic valve disease.

Keywords

AngiogenesisCalcificationCardiovascularMMPVEGF

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Daihiko Hakuno
    • 1
    • 2
  • Naritaka Kimura
    • 1
    • 3
  • Masatoyo Yoshioka
    • 1
  • Keiichi Fukuda
    • 1
  1. 1.Department of Regenerative Medicine and Advanced Cardiac TherapeuticsKeio University School of MedicineShinjuku-kuJapan
  2. 2.Cardiovascular Division, Department of Internal MedicineKeio University School of MedicineTokyoJapan
  3. 3.Department of Cardiovascular SurgeryKeio University School of MedicineTokyoJapan