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Three-Dimensional Cartilage Regeneration Using Engineered Cartilage Gel With a 3D-Printed Polycaprolactone Framework.
Gaoyang Wu1, Lixing Lu2, Zheng Ci3,4
1Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Frontiers in Bioengineering and Biotechnology
|June 10, 2022
Summary
Replacing decalcified bone matrix frameworks with 3D-printed polycaprolactone (PCL) enhances engineered cartilage gel (ECG) regeneration. This novel approach improves cartilage quality and shape retention for potential clinical translation.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- The
Purpose of the Study:
- To evaluate a 3D-printed polycaprolactone (PCL) framework as a replacement for decalcified bone matrix (DBM) in engineered cartilage gel (ECG) constructs for improved cartilage regeneration.
- To assess the biocompatibility, ECG loading efficiency, inflammatory response, and cartilage regeneration capacity of PCL-ECG constructs compared to DBM-ECG constructs.
Main Methods:
- Fabrication of 3D-printed PCL frameworks and DBM frameworks.
- Loading of engineered cartilage gel (ECG) onto both framework types.
- In vitro assessment of ECG loading efficiency and biocompatibility.
- In vivo subcutaneous implantation in large animals for 8 weeks to evaluate inflammatory response and cartilage regeneration.
- In vitro macrophage activation assays.
- Quantitative analysis of glycosaminoglycan (GAG) and total collagen content in regenerated cartilage.
Main Results:
- PCL frameworks demonstrated good biocompatibility with ECG and high loading efficiency, comparable to DBM.
- PCL-ECG constructs elicited a milder inflammatory response in vivo and in vitro compared to DBM-ECG constructs.
- PCL-ECG constructs successfully regenerated mature cartilage with significantly higher GAG and collagen content than DBM-ECG constructs.
- PCL-ECG constructs maintained their shape integrity throughout the 8-week implantation period.
Conclusions:
- 3D-printed PCL frameworks offer a customizable, mechanically controllable, and standardized alternative to DBM for supporting ECG-based 3D cartilage regeneration.
- The PCL-ECG model presents a promising strategy for overcoming limitations of DBM and advancing the clinical translation of 3D cartilage regeneration technology.
