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Rolipram, a phosphodiesterase 4 inhibitor, stimulates osteoclast formation by inducing TRANCE expression in mouse

Eun Sook Cho1, Ja Heon Yu, Mi Sun Kim

  • 1College of Pharmacy, Sookmyung Women's University, Seoul 140-742, Korea.

Archives of Pharmacal Research
|January 14, 2005
PubMed

Insights

Rolipram, a phosphodiesterase (PDE) 4 inhibitor, promotes osteoclast formation by increasing TRANCE mRNA expression in osteoblasts. This finding highlights a novel mechanism regulating bone resorption.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Bone Biology

Background:

  • Phosphodiesterase (PDE) 4 regulates intracellular cyclic adenosine monophosphate (cAMP) levels.
  • Osteoclast formation is crucial for bone remodeling and is implicated in various bone diseases.

Purpose of the Study:

  • To investigate the effect of rolipram, a specific PDE4 inhibitor, on osteoclast formation.
  • To elucidate the underlying molecular mechanisms involved in rolipram-induced osteoclastogenesis.

Main Methods:

  • Coculture of mouse bone marrow cells and calvarial osteoblasts.
  • Treatment with rolipram and osteoprotegerin (OPG).
  • Northern blot analysis to assess TRANCE mRNA expression.

Main Results:

  • Rolipram significantly induced osteoclast formation in cocultures.
  • Osteoclast formation was dependent on the presence of calvarial osteoblasts.
  • Rolipram treatment led to increased expression of TNF-related activation-induced cytokine (TRANCE) mRNA in osteoblasts.
  • Osteoclast formation induced by rolipram was completely inhibited by OPG.

Conclusions:

  • PDE4 inhibition up-regulates TRANCE mRNA expression in osteoblasts.
  • This up-regulation of TRANCE by PDE4 inhibitors plays a key role in controlling osteoclast formation.
  • Targeting PDE4 may represent a therapeutic strategy for modulating bone resorption.

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