Targeting CD14 to Inhibit Macrophage Senescence and Regulate the Microenvironment for Enhanced Tendon-Bone Healing

Area of Science:

• Orthopedics and Regenerative Medicine
• Immunology and Inflammation Research
• Biomaterials Science

Background:

• No targeted pharmacological agents exist for postoperative management of anterior cruciate ligament reconstruction (ACLR).
• Macrophage senescence at the tendon-bone interface may impair healing.
• Understanding this microenvironment is crucial for developing new therapies.

Purpose of the Study:

• To investigate the role of macrophage senescence in the tendon-bone interface post-ACLR.
• To determine if targeting CD14 can reduce senescence and enhance tendon-bone healing.

Main Methods:

• A murine ACLR model was utilized to assess tendon-bone healing.
• Histological, micro-CT, and biomechanical analyses were performed 8 weeks post-surgery.
• Macrophage senescence and heterogeneity were evaluated using specific staining and bioinformatic analyses.

Main Results:

• Early inflammation induced macrophage senescence, activating inflammatory pathways and increasing CD14 expression.
• Targeting CD14 effectively reduced macrophage senescence and inflammation.
• This targeted approach led to improved tendon-bone healing in the murine model.

Conclusions:

• Excessive inflammation promotes macrophage senescence, hindering tendon-bone healing post-ACLR.
• Targeting CD14 prevents macrophage senescence and enhances tendon-bone healing.
• CD14-targeted therapy shows significant translational potential for clinical application in ACLR recovery.