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The Pharmaceutical Society of Korea (대한약학회)
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Rolipram, a Phosphodiesterase 4 Inhibitor, Stimulates Osteoclast Formation by Inducing TRANCE Expression in Mouse Calvarial Cells

  • Cho, Eun-Sook (College of Pharmacy, Sookmyung Women's University) ;
  • Yu, Ja-Heon (College of Pharmacy, Sookmyung Women's University) ;
  • Kim, Mi-Sun (College of Pharmacy, Sookmyung Women's University) ;
  • Yim, Mi-Jung (College of Pharmacy, Sookmyung Women's University)
  • Published : 2004.01.01
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Abstract

Phosphodiesterase (PDE) 4 is an enzyme that degrades intracellular cAMP. In the present study, the effect of rolipram, a specific phosphodiesterase (PDE) 4 inhibitor, on osteoclast formation was investigated. Rolipram induced osteoclast formation in cocultures of mouse bone marrow cells and calvarial osteoblasts. This activity was not observed in the absence of calvarial osteoblasts, suggesting that calvarial osteoblasts are likely target cells of rolipram. Osteoclast formation by rolipram was completely blocked by the addition of osteoprotegerin (OPG), a soluble decoy receptor for the osteoclast differentiation factor, TNF-related activation-induced cytokine (TRANCE, identical to RANKL, ODF, and OPGL). Northern blot analysis revealed the effect of rolipram to be associated with the increased expression of TRANCE mRNA in mouse calvarial osteoblasts. Collectively, these data indicate that PDE4 inhibitor up-regulates the TRANCE mRNA expression in osteoblasts, which in turn controls osteoclast formation.

Keywords

References

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