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Sequentially-crosslinked bioactive hydrogels as nano-patterned substrates with customizable stiffness and degradation
Muhammad Rizwan1, Gary S L Peh2, Heng-Pei Ang3
1Department of Biomedical Engineering, National University of Singapore, Singapore; Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore.
Biomaterials
|January 7, 2017
Summary
This study developed a stronger hydrogel, GelMA+, for tissue engineering. This enhanced material supports the growth of human corneal endothelial cells, offering a promising solution for treating corneal blindness.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Ophthalmology
Background:
- Naturally bioactive hydrogels like gelatin are suitable for tissue engineering but lack mechanical strength for implants.
- Gelatin methacrylate (GelMA) is a bioactive hydrogel with potential for tissue regeneration.
- Corneal blindness due to endothelial dysfunction requires effective tissue-engineered solutions.
Purpose of the Study:
- To enhance GelMA's mechanical strength for implantable tissue engineering substrates.
- To develop a GelMA-based carrier for tissue-engineered human corneal endothelial cell (HCEC) monolayers.
- To assess the suitability of the enhanced hydrogel for corneal transplantation.
Main Methods:
- Sequential hybrid crosslinking (physical followed by UV) to create GelMA+.
- Fabrication of nano-patterned hydrogels using oxygen-impermeable stamps.
- Culturing and evaluating primary HCEC monolayers on patterned GelMA+.
Main Results:
- GelMA+ exhibited an 8-fold increase in mechanical strength compared to standard GelMA.
- The material demonstrated robust performance under surgical device loading and favorable biodegradation.
- HCEC monolayers on patterned GelMA+ showed improved cell density, homogeneity, and zona-occludin-1 expression.
Conclusions:
- The hybrid crosslinking approach significantly enhances hydrogel mechanical properties.
- Patterned GelMA+ supports the development of functionally superior, transplantable HCEC monolayers.
- This approach holds potential for creating advanced implantable tissue-engineered cell-carrier constructs.
