Receptor activator of nuclear factor kappaB ligand and osteoprotegerin regulate aortic valve calcification
| Autor: | Karl K. Haase, Svetlana Bickelhaupt, Siegfried Hagl, Rainer Grobholz, Jens J. Kaden, Carl-Erik Dempfle, Ingrid Zahn, Christian F. Vahl, Refika Kılıç, Siegfried Lang, Martina Brueckmann, Martin Borggrefe, Aslıhan Sarıkoç |
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| Rok vydání: | 2004 |
| Předmět: |
musculoskeletal diseases
medicine.medical_specialty Receptors Cytoplasmic and Nuclear Receptors Tumor Necrosis Factor Osteoprotegerin Osteogenesis Internal medicine medicine Humans Molecular Biology Glycoproteins Membrane Glycoproteins Sclerosis biology Receptor Activator of Nuclear Factor-kappa B Chemistry RANK Ligand Calcinosis Osteoblast Aortic Valve Stenosis DNA Fibroblasts medicine.disease Immunohistochemistry Neoplasm Proteins medicine.anatomical_structure Endocrinology RANKL Aortic Valve biology.protein Osteocalcin Alkaline phosphatase Aortic valve calcification Cardiology and Cardiovascular Medicine Carrier Proteins Calcification Protein Binding Transcription Factors |
| Zdroj: | Journal of molecular and cellular cardiology. 36(1) |
| ISSN: | 0022-2828 |
| Popis: | Objective - Recent studies have suggested that valvular calcification in calcific aortic stenosis (AS) may be actively regulated. "Receptor Activator of Nuclear factor kappaB Ligand" (RANKL) and osteoprotegerin (OPG) are members of a cytokine system involved in bone turnover and vascular calcification. Their role in calcific AS is not known. Methods and results - By immunohistochemistry using human aortic valves, RANKL was not expressed at relevant levels in controls but detectable in AS. OPG expression was marked in controls but significantly lower in AS. Areas containing focal calcification exhibited significantly less OPG-positive cells as compared to non-calcified regions. Stimulation with RANKL lead to a significant rise in matrix calcification, nodule formation, alkaline phosphatase activity, expression of the bone-type isoenzyme of alkaline phosphatase, and expression of osteocalcin in cultured human aortic valve myofibroblasts. Moreover, RANKL increased DNA binding of the essential osteoblast transcription factor cbfa-1. Conclusion - RANKL and OPG are differentially expressed in calcific AS. In cultured human aortic valve myofibroblasts, RANKL promotes matrix calcification and induces the expression of osteoblast-associated genes, indicating a transition towards an osteogenic phenotype. These results suggest that the RANKL-OPG pathway may regulate valvular calcification in calcific AS? |
| Databáze: | OpenAIRE |
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