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Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment
Published on: September 7, 2022
Modified dendrimer cross-linked collagen-based matrices.
1a Department of Chemical Engineering , McMaster University , 1280 Main Street W. , Hamilton , ON , Canada , L8S 4L8.
Journal of Biomaterials Science. Polymer Edition
|December 6, 2011
Summary
Dendrimer cross-linking creates strong collagen hydrogels. Commercially sourced collagens (PureCol, human collagen, and ECM) were tested, showing potential for tissue engineering despite varying stability.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Collagen hydrogels are crucial for tissue engineering.
- Dendrimer cross-linking offers a method to enhance hydrogel properties.
- Investigating commercial collagen sources is vital for practical applications.
Purpose of the Study:
- To evaluate commercially available collagen products (PureCol, human collagen, human ECM) for dendrimer cross-linking.
- To compare the stability and properties of these gels against a benchmark dendrimer-crosslinked collagen gel.
- To assess the cell compatibility of the fabricated collagen-based hydrogels.
Main Methods:
- Concentration of PureCol (PC), human collagen (HC), and human extracellular matrix (hECM).
- Cross-linking using generation two polypropyleneimine octaamine dendrimers with EDC/NHS chemistry.
- Fabrication of PC gels at 20 and 30 mg/ml concentrations.
- Assessment of gel stability via collagenase digestion and swelling.
- Evaluation of 3T3 fibroblast cell growth over four days.
Main Results:
- PureCol (PC) gels exhibited increased swelling and reduced stability compared to benchmark dendrimer-crosslinked collagen gels (CG).
- Highly purified bovine (PC) and human collagen (HC) gels showed similar performance but were less stable than CG gels.
- Addition of hECM to PC created looser networks (PC-hECM gels) compared to heparinized dendrimer-crosslinked bovine collagen gels (CHG).
- All tested collagen-based hydrogels supported 3T3 fibroblast cell proliferation.
Conclusions:
- Commercially sourced collagens can be effectively cross-linked with dendrimers, but stability varies.
- Purification and storage methods of commercial collagen products may influence hydrogel performance.
- The developed collagen-based hydrogels demonstrate good cell compatibility, suggesting suitability for tissue engineering.
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