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Interactions between FGF21 and BMP-2 in osteogenesis

Kazunari Ishida1, Dominik R Haudenschild

  • 1Lawrence J.Ellison Musculoskeletal Research Center, Department of Orthopaedic Surgery, University of California Davis, 4635 Second Avenue, Sacramento, CA 95817, USA.

Biochemical and Biophysical Research Communications
|February 19, 2013
PubMed

Insights

Fibroblast growth factor 21 (FGF21) enhances bone formation by boosting bone morphogenic protein-2 (BMP-2) signaling. This study reveals FGF21

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Endocrinology

Background:

  • Lifestyle-related diseases contribute to bone fragility and impaired fracture healing.
  • Fibroblast growth factor 21 (FGF21) regulates metabolism and is a potential therapeutic for diabetes and obesity.
  • Bone morphogenic protein-2 (BMP-2) is crucial for osteogenesis, but its interaction with FGF21 is unknown.

Purpose of the Study:

  • To investigate the effect of FGF21 on BMP-2-dependent osteogenic activity.
  • To elucidate the molecular mechanisms underlying the interaction between FGF21 and BMP-2 signaling pathways.

Main Methods:

  • Utilized C2C12 cells as a model system to study osteogenesis.
  • Assessed osteogenic activity through alkaline phosphatase activity, matrix mineralization, and gene expression analysis.
  • Investigated intracellular signaling pathways, including Smad and p44/42MAPK, and FGF21 mRNA expression.

Main Results:

  • FGF21 significantly enhanced BMP-2-dependent transcription and osteogenesis in C2C12 cells.
  • FGF21 potentiated BMP-2-induced intracellular signaling via the Smad pathway, but not the p44/42MAPK pathway.
  • A negative feedback loop was identified where BMP-2 suppressed endogenous FGF21 mRNA expression.

Conclusions:

  • FGF21 and BMP-2 signaling pathways interact in vitro.
  • FGF21 enhances BMP-2's osteogenic activity by up-regulating the BMP-2-dependent Smad signaling pathway.
  • These findings suggest FGF21 as a potential therapeutic agent for bone-related conditions associated with metabolic diseases.

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