Protein-reactive, thermoresponsive copolymers with high flexibility and biodegradability

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Injectable hydrogels are promising for drug delivery and tissue engineering.
• Developing thermosensitive, biodegradable hydrogels with tunable properties is crucial for advanced biomedical applications.

Purpose of the Study:

• To synthesize and characterize novel injectable, biodegradable, thermosensitive copolymers.
• To investigate the impact of monomer composition and collagen incorporation on hydrogel properties.
• To evaluate the potential of these hydrogels as cell or pharmaceutical delivery vehicles.

Main Methods:

• Free radical polymerization was used to synthesize copolymers of N-isopropylacrylamide, acrylic acid, N-acryloxysuccinimide, and polylactide-hydroxyethyl methacrylate.
• Hydrogel properties including injectability, gelation temperature, swelling, mechanical strength, degradation, and cytocompatibility were assessed.
• Cell adhesion studies were performed on hydrogels with and without collagen.

Main Results:

• Synthesized copolymers were injectable below room temperature and formed robust hydrogels at 37°C with tunable lower critical solution temperatures (LCSTs) between 18-26°C.
• Collagen incorporation increased water content and improved cell adhesion but decreased mechanical strength.
• Hydrogels exhibited significant degradation over 21 days at 37°C, with degradation products being non-cytotoxic.

Conclusions:

• The novel thermosensitive copolymers offer tunable properties for biomedical applications.
• These biodegradable hydrogels demonstrate potential as versatile platforms for cell and drug delivery in tissue engineering.
• Further research can optimize these hydrogels for specific therapeutic uses.