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Software-Assisted Quantitative Measurement of Osteoarthritic Subchondral Bone Thickness
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Blocking PI3K/AKT signaling inhibits bone sclerosis in subchondral bone and attenuates post-traumatic osteoarthritis

Chuangxin Lin1,2,3, Yan Shao1,2,3, Chun Zeng1,2,3

  • 1Department of Orthopedics, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong, China.

Journal of Cellular Physiology
|January 12, 2018
PubMed

Insights

Inhibiting the PI3K/AKT signaling pathway can prevent abnormal bone growth and reduce cartilage damage in osteoarthritis (OA). This pathway

Area of Science:

  • Biomedical research
  • Orthopedics
  • Molecular biology

Background:

  • Osteoarthritis (OA) pathophysiology involves PI3K/AKT signaling.
  • The role of PI3K/AKT in early OA progression and subchondral bone changes remains unclear.

Purpose of the Study:

  • Investigate the role of PI3K/AKT signaling in early OA.
  • Examine its impact on subchondral bone and cartilage degeneration.
  • Assess the therapeutic potential of PI3K/AKT inhibition.

Main Methods:

  • Utilized a destabilization of the medial meniscus (DMM) mouse model for OA.
  • Administered PI3K/AKT signaling inhibitor LY294002.
  • Analyzed subchondral bone changes, cartilage degeneration, and serum/bone markers.
  • Investigated the involvement of the NF-κB pathway.

Main Results:

  • DMM induced increased PI3K/AKT signaling and aberrant subchondral bone formation.
  • LY294002 treatment prevented these bone changes and attenuated cartilage degeneration.
  • Elevated MMP-13 levels, primarily in osteoblastic cells, were reduced by LY294002.
  • PI3K/AKT signaling promoted preosteoblast proliferation, differentiation, and MMP-13 expression via NF-κB activation.

Conclusions:

  • PI3K/AKT signaling drives aberrant subchondral bone formation and cartilage degeneration in early OA.
  • Inhibition of the PI3K/AKT/NF-κB axis is a promising therapeutic strategy for OA.
  • Targeting this pathway may prevent bone abnormalities and slow OA progression.
Keywords:
PI3K/AKT signalingarticular cartilageosteoarthritispreosteoblastssubchondral bone

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