[Osteopractic total flavone promoting rat extra-articular tendon-bone healing through mTOR pathway]

Area of Science:

• Orthopedics
• Regenerative Medicine
• Biomaterials Science

Background:

• Tendon healing is a complex process involving cellular differentiation and tissue regeneration.
• Osteopractic total flavone (OTF) is a potential therapeutic agent for promoting tissue repair.

Purpose of the Study:

• To investigate the effects of OTF on tendon healing in a rat model.
• To elucidate the molecular mechanisms underlying OTF's action on tendon stem cells and tendon-bone healing.

Main Methods:

• In vitro study: Tendon stem cells were treated with varying concentrations of OTF, and key protein expressions (ALP, Runx2, OCN, VEGF, P-S6, P-4E/BP1) were analyzed.
• In vivo study: A rat extra-articular tendon-bone transplant model was used, with groups treated with OTF or saline.
• Assessment: Biomechanical testing, histological analysis, and evaluation of new vessel formation were performed at 3 and 6 weeks post-surgery.

Main Results:

• OTF treatment increased osteogenic differentiation markers (ALP, Runx2, OCN) and VEGF expression in vitro.
• mTOR pathway activation was indicated by increased P-S6 and decreased P-4E/BP1 protein levels.
• In vivo, OTF significantly improved tendon-bone healing strength and histological quality, with increased Sharpey fiber density and vascularization by 6 weeks.

Conclusions:

• OTF promotes osteogenic differentiation of tendon stem cells through the mTOR signaling pathway.
• OTF effectively stimulates tendon-bone healing in a bone tunnel model.
• OTF enhances the quality of the tendon-bone connection.