Digital light processing 3D printed silk fibroin hydrogel for cartilage tissue engineering.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Digital Light Processing (DLP) 3D printing is advancing tissue engineering.
• Developing biocompatible, biodegradable, and printable bio-inks is crucial for clinical applications.
• Silk fibroin is a natural polymer with potential for biomaterial fabrication.

Purpose of the Study:

• To fabricate a novel bio-ink using Silk fibroin and glycidyl-methacrylate (Silk-GMA) for DLP 3D printing.
• To evaluate the chondrogenesis potential of chondrocyte-laden Silk-GMA hydrogels in vitro and in vivo.
• To assess the suitability of Silk-GMA hydrogels for cartilage regeneration applications.

Main Methods:

• Silk fibroin was modified with glycidyl-methacrylate to create Silk-GMA.
• Silk-GMA was used as a bio-ink for DLP 3D printing.
• Chondrocyte-laden hydrogels were cultured in vitro for 4 weeks and implanted in vivo into rabbit tracheal defects.

Main Results:

• DLP 3D printing ensured even cell distribution and rapid fabrication of Silk-GMA constructs.
• In vitro studies confirmed cell viability, proliferation, and chondrogenic differentiation within Silk-GMA hydrogels.
• In vivo implantation demonstrated the formation of cartilage-like tissue and epithelium surrounding the Silk-GMA hydrogel in rabbit tracheal defects.

Conclusions:

• Silk-GMA hydrogels fabricated using DLP 3D printing are suitable for tissue engineering applications requiring mechanical properties, such as cartilage regeneration.
• The developed bio-ink supports cell viability, proliferation, and differentiation, leading to successful tissue formation in vivo.
• This technology shows significant promise for clinical applications in regenerative medicine.