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Three-dimensional Biomimetic Technology: Novel Biorubber Creates Defined Micro- and Macro-scale Architectures in Collagen Hydrogels
Published on: February 12, 2016
Photochemically cross-linked collagen gels as three-dimensional scaffolds for tissue engineering
Shinichi Ibusuki1, Gerrit J Halbesma, Mark A Randolph
1Department of Orthopedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Tissue Engineering
|May 24, 2007
Summary
Photochemically cross-linking collagen gels with riboflavin and visible light creates stable tissue engineering scaffolds. This method enhances cell viability and significantly reduces gel contraction, offering a promising solution for tissue regeneration.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Photochemistry
Background:
- Collagen gels are promising for tissue engineering but suffer from significant contraction due to weak noncovalent bonds.
- This contraction limits their utility as stable scaffolds for cell growth and tissue development.
Purpose of the Study:
- To investigate the efficacy of photochemical cross-linking using photo-initiators to create stable collagen gel scaffolds.
- To evaluate the impact of cross-linking on cell viability and gel contraction in tissue engineering applications.
Main Methods:
- Collagen gels were cross-linked using Rose Bengal and riboflavin as photo-initiators with visible light.
- Chondrocyte and fibroblast viability and gel contraction were assessed over 7 days of culture.
- Different concentrations of photo-initiators and illumination times were tested.
Main Results:
- Rose Bengal at effective concentrations led to poor cell viability.
- Riboflavin at 0.25-0.5 mM with 40s illumination allowed >90% short-term cell viability.
- Cross-linked gels retained significantly more diameter (85-88%) compared to non-cross-linked gels (25-60%) by day 7.
- Long-term chondrocyte viability was favorable with specific riboflavin concentrations.
Conclusions:
- Photochemical cross-linking of collagen gels using riboflavin and visible light is a viable method for creating stable tissue engineering scaffolds.
- This technique supports favorable cell survival and minimizes gel contraction, addressing key limitations of traditional collagen gels.
- The developed method offers a promising approach for advancing tissue engineering applications.
