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Effect of omeprazole on the expression of transcription factors in osteoclasts and osteoblasts

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The use of proton pump inhibitors (PPIs) seems to be related to increased fracture risk but the mechanism is unclear. In an effort to clarify the mechanism, we evaluated the effect of omeprazole, a representative of the PPIs, on the expression of transcription factors in osteoclasts and osteoblasts. Murine RAW264.7 and MC3T3-E1 cells were used for osteoclast and osteoblast analysis, to which various concentrations of omeprazole were added. RAW264.7 cells with ≥3 nuclei were considered tartrate-resistant acid phosphatase (TRAP)-positive, i.e. activated osteoclasts. Expressions of the calcitonin receptor (CTR), c-fos, nuclear factor of activated T-cells, cytoplasmic 1 (NFATc1), and matrix metalloproteinase (MMP)-9 mRNA in osteoclasts were evaluated. Gene expression of osteocalcin and of the osteoprotegerin/receptor activator of NF-κB ligand (OPG/RANKL) ratio in osteoblasts was examined and Western blotting of NFATc1 was performed. Treating the osteoclasts with increasing doses of omeprazole did not affect TRAP positivity, but significantly decreased the expressions of CTR, c-fos, NFATc1, and MMP-9 regardless of the omeprazole concentration. The expression of osteocalcin and of the OPG/RANKL ratio in osteoblasts was augmented with increasing omeprazole concentrations. The result of the Western blot analysis with NFATc1 was similar to that of the expression of NFATc1 mRNA. Omeprazole decreased the activation of osteoclasts but increased that of osteoblasts in vitro, in part causing an osteopetrosis-like effect. Together with the effect of omeprazole on calcium homeostasis, increased fracture risk may be due to the osteopetrorickets-like effect of omeprazole.
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Document Type: Research Article

Affiliations: Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea

Publication date: December 1, 2010

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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