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KLF2 interacts with AP-1 to negatively affect osteoclast differentiation and activity.

Sijun Liu1, Shasha Tu1, Mengmeng Duan2

  • 1Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China.

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|February 5, 2026
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Summary

Krüppel-like factor 2 (KLF2) inhibits osteoclast formation, maturation, and activity by negatively regulating the activator protein-1 (AP-1) complex. This discovery offers potential therapeutic targets for osteolytic diseases like osteoporosis.

Keywords:
AP-1C-FosC-JunKLF2OsteoclastsOsteoporosis

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Area of Science:

  • Bone Biology
  • Cellular and Molecular Biology
  • Immunology

Background:

  • Osteoclasts are crucial for bone resorption and homeostasis.
  • Krüppel-like factor 2 (KLF2) is linked to osteoclast differentiation, but its mechanism is unclear.

Purpose of the Study:

  • Investigate KLF2's role in osteoclastogenesis, maturation, and activity.
  • Elucidate the biomechanisms underlying KLF2's regulation of osteoclasts.

Main Methods:

  • Characterization of osteoclast number, size, and markers.
  • Assessment of actin ring and podosome cluster formation.
  • Analysis of intracellular acidification via KLF2 overexpression and knockdown.
  • Chromatin immunoprecipitation (ChIP) and co-immunoprecipitation (Co-IP) assays.
  • Investigation of the RANKL-MAPK-AP-1-NFATc1 signaling axis.

Main Results:

  • KLF2 negatively regulates osteoclastogenesis, maturation, and activity.
  • KLF2 directly interacts with c-Fos and c-Jun, components of the activator protein-1 (AP-1) complex.
  • KLF2 mediates osteoclast function through negative regulation of the AP-1 complex.
  • JNK signaling inhibition reduces AP-1 activation in KLF2 knockdown cells, highlighting the RANKL-MAPK-AP-1-NFATc1 pathway.

Conclusions:

  • KLF2 acts as a negative regulator of osteoclast function.
  • KLF2's mechanism involves the negative regulation of the AP-1 complex via the RANKL-MAPK-AP-1-NFATc1 axis.
  • KLF2 represents a potential therapeutic target for osteolytic diseases such as osteoporosis.