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p38 mitogen-activated protein kinase regulates osteoblast differentiation through osterix

Xueying Wang1, Choon Hong Goh, Baojie Li

  • 1The Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673, Republic of Singapore.

Endocrinology
|December 23, 2006
PubMed

Insights

p38 MAPK signaling regulates osteoblast differentiation by controlling osterix (Osx) expression. This kinase positively influences bone morphogenetic protein-induced Osx, revealing a new mechanism in bone formation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • p38 Mitogen-Activated Protein Kinase (MAPK) is implicated in regulating osteoblast differentiation.
  • The precise molecular mechanisms linking p38 MAPK to osteoblast differentiation remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of p38 MAPK in osteoblast differentiation.
  • To investigate the molecular mediators, specifically the transcription factor osterix (Osx), involved in p38 MAPK-regulated osteogenesis.

Main Methods:

  • Utilized p38 MAPK inhibitors and dominant-negative mutants in osteoblast cultures.
  • Assessed osteoblast differentiation markers and osterix (Osx) expression at mRNA and protein levels.
  • Employed p53 knockout osteoblasts and Osx-overexpressing osteoblasts for mechanistic studies.

Main Results:

  • Inhibition of p38 MAPK down-regulated both protein and mRNA levels of osterix (Osx), a key transcription factor for osteoblast differentiation.
  • The inhibitory effect of p38 MAPK inhibition on differentiation was diminished in p53 knockout osteoblasts and Osx-overexpressing osteoblasts.
  • p38 MAPK positively regulates bone morphogenetic protein-induced Osx expression, suggesting a role in mediating BMP signaling.

Conclusions:

  • Osterix (Osx) acts as a crucial mediator for p38 MAPK's regulation of osteoblast differentiation.
  • p38 MAPK signaling is essential for maintaining Osx expression, thereby promoting osteogenesis.
  • These findings uncover a novel pathway where p38 MAPK influences osteoblast differentiation via Osx modulation.

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