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Semi-synthetic collagen/poloxamine matrices for tissue engineering
Alejandro Sosnik1, Michael V Sefton
1Department of Chemical Engineering and Applied Chemistry, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Room 407D, Toronto, ON, Canada M5S 3G9.
Biomaterials
|July 19, 2005
Summary
Researchers developed novel collagen-poloxamine hydrogels to enhance stiffness for tissue engineering. These improved biomaterials show promise for cell viability and tissue regeneration applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Native collagen gels lack sufficient mechanical stiffness for many tissue engineering applications.
- Chemical crosslinking can improve collagen gel properties but may affect cell behavior.
- Poloxamines are amphiphilic block copolymers with tunable properties.
Purpose of the Study:
- To create stiffer collagen-based hydrogels by incorporating functionalized poloxamines.
- To evaluate the mechanical properties and cytocompatibility of the novel hydrogel system.
- To assess the potential of these hydrogels for tissue engineering applications.
Main Methods:
- Functionalization of a four-arm PEO-PPO block copolymer (poloxamine) with methacrylate groups.
- Free radical polymerization of methacrylated poloxamine in the presence of collagen.
- Mechanical characterization using storage modulus (G') and loss modulus (G'').
- Cell viability assessment using AlamarBlue assay with HepG2 cells.
Main Results:
- The collagen-poloxamine hydrogels exhibited a significant increase in stiffness compared to pure collagen gels (e.g., G' increased from ~70 Pa to ~7400 Pa).
- Cell viability remained high (65-91%) for HepG2 cells encapsulated within the hydrogels with varying photoinitiator concentrations.
- HepG2 and endothelial cells demonstrated good adhesion and spreading on the hydrogel surfaces.
Conclusions:
- Methacrylate-functionalized poloxamines effectively stiffen collagen hydrogels via crosslinking.
- The developed hydrogels support cell viability and promote cell adhesion and spreading.
- These collagen-poloxamine hydrogels represent a promising biomaterial for tissue engineering applications requiring enhanced mechanical properties.