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Updated: May 6, 2026
A Novel Tenorrhaphy Suture Technique with Tissue Engineered Collagen Graft to Repair Large Tendon Defects
Published on: December 10, 2021
Genetically engineered extracellular vesicles-based collagen-targeting bioinspired scaffold for tendon regenerative
Yan-Jing Zhang1, Jing Cui2, Xin-Yue Xie2
1Department of Orthopedic Surgery and Orthopedic Research Institute, Stem Cell and Tissue Engineering Research Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Core Facilities, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China.
This study introduces a novel bioinspired scaffold using engineered extracellular vesicles to enhance tendon repair. The scaffold improves cell function and promotes better healing for massive tendon injuries.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Tissue Engineering
Background:
- Tendon injuries, especially massive defects, present significant clinical challenges due to poor natural healing and limited treatment efficacy.
- Current therapies for tendon repair often yield suboptimal outcomes, highlighting the need for innovative regenerative strategies.
Purpose of the Study:
- To develop a bioinspired scaffold integrating genetically engineered extracellular vesicles (EVs) with collagen-targeting capabilities for enhanced tendon regenerative repair.
- To investigate the efficacy of these engineered EVs in promoting tenogenic differentiation and improving the microenvironment for tendon healing.
Main Methods:
- Genetically modified rat tendon-derived stem cells (TDSCs) to overexpress biglycan (Bgn) and fibromodulin (Fmod) for bioactive EV production.
- Engineered EVs with a collagen-targeting peptide (CTP) for improved scaffold integration and sustained release.
- Incorporated EVs into a decellularized bovine tendon sheet (DBTS) to create a bioinspired scaffold for in vitro and in vivo studies.
Main Results:
- In vitro: Enhanced TDSC proliferation, migration, and tenogenic differentiation driven by EVs via the miR-145-5p/TGFβ2 pathway.
- In vivo: Demonstrated improved collagen alignment, extracellular matrix remodeling, and biomechanical performance in regenerated rat Achilles tendons.
- The CTP ensured efficient EV attachment and sustained release within the scaffold at the injury site.
Conclusions:
- The developed bioinspired scaffold effectively supports tendon regeneration by modulating the tendon niche.
- This cell-free strategy offers a promising therapeutic approach for treating massive tendon injuries with translational potential.
- The engineered EVs and scaffold system represent an innovative advancement in regenerative medicine for tendon repair.
