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Surfactin Inhibits Osteoclast Differentiation by Negatively Regulating the Elk1-AP-1-NFATc1 Axis.

Kazuki Maruyama1,2, Ayaka Koga2,3, Yuki Kodama2

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Surfactin, a biosurfactant, inhibits osteoclast differentiation by targeting the Elk1-AP-1-NFATc1 pathway. This finding suggests surfactin

Keywords:
AP-1Elk1NFATc1osteoclastsurfactin

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Surfactin is a biosurfactant with known antibacterial and anti-inflammatory effects.
  • Its role in bone metabolism, particularly osteoclast differentiation, is largely unexplored.

Purpose of the Study:

  • To investigate the impact of surfactin on osteoclast differentiation.
  • To elucidate the molecular mechanisms underlying surfactin's effects on bone cells.

Main Methods:

  • RAW264.7 cells were stimulated with RANKL and treated with surfactin.
  • Osteoclast differentiation was assessed via TRAP staining and F-actin staining.
  • Gene expression (Nfatc1, Acp5, Cathepsin K) and protein signaling (NF-κB, MAPK, c-Fos, Elk1) were analyzed.

Main Results:

  • Surfactin significantly inhibited osteoclast differentiation and maturation.
  • Surfactin reduced mRNA expression of key osteoclast markers: Nfatc1, Acp5, and Cathepsin K.
  • Surfactin suppressed c-Fos expression and Elk1 phosphorylation, key regulators of osteoclastogenesis.

Conclusions:

  • Surfactin inhibits RANKL-induced osteoclast differentiation via the Elk1-AP-1-NFATc1 signaling pathway.
  • Surfactin demonstrates potential as a therapeutic agent for metabolic bone diseases and inflammatory bone destruction.