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Real-Time Imaging of CCL5-Induced Migration of Periosteal Skeletal Stem Cells in Mice
Published on: September 16, 2020
cGAS-STING pathway mediation in osteoclast function and bone fracture healing.
Miaomiao Zheng1, Li Zhao2, Shensheng Nian1
1Department of Orthopedics, Changhai Hospital, Naval Military Medical University, Shanghai, China.
Frontiers in Immunology
|June 8, 2026
Summary
The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) pathway accelerates fracture healing by promoting osteoclast differentiation. This pathway is crucial in the early inflammatory phase of bone repair.
Area of Science:
- Immunology
- Cell Biology
- Orthopedics
Background:
- The cGAS-STING pathway is a critical regulator of innate immunity and inflammation.
- Understanding its role in tissue repair, particularly fracture healing, is essential for developing new therapeutic strategies.
Purpose of the Study:
- To investigate the biological role and molecular mechanisms of the cGAS-STING pathway in fracture healing.
- To focus on its function during the early inflammatory phase of bone repair.
Main Methods:
- A murine femoral fracture model was used to study cGAS-STING pathway activation.
- Transcriptome sequencing, immunohistochemistry, microCT, and various in vitro assays were employed.
- Pathway modulation was achieved using a STING inhibitor (H-151) and activator (SR-717).
Main Results:
- STING expression was higher in the early stages of fracture healing.
- cGAS-STING pathway activation, particularly with SR-717, promoted osteoclast formation and activity.
- The pathway enhanced RANKL-induced NF-κB signaling, crucial for osteoclastogenesis.
Conclusions:
- The cGAS-STING pathway significantly accelerates fracture healing in mice.
- This pathway's role is primarily through influencing osteoclast differentiation via the NF-κB signaling pathway.
- Targeting cGAS-STING may offer a therapeutic approach for enhancing bone repair.
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