Versatile biofunctionalization of polypeptide-based thermosensitive hydrogels via click chemistry.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Cell Biology

Background:

• Thermosensitive hydrogels offer tunable properties for biomedical applications.
• Developing functionalizable hydrogels is crucial for advanced tissue engineering.

Purpose of the Study:

• To synthesize and characterize novel thermosensitive hydrogels based on PEG-PPLG.
• To evaluate the cytocompatibility, degradation, and in vivo behavior of these hydrogels.
• To explore the functionalization potential for enhanced cell adhesion.

Main Methods:

• Synthesis of poly(ethylene glycol)-block-poly(γ-propargyl-l-glutamate) (PEG-PPLG) copolymers.
• Characterization using NMR, DLS, and circular dichroism.
• In vitro cell encapsulation studies with L929 fibroblasts.
• In vitro degradation studies using proteinase K.
• In vivo biocompatibility assessment and histological analysis.
• Functionalization with azide-modified bioactive molecules (biotin, galactose).

Main Results:

• PEG-PPLG hydrogels exhibited thermosensitive sol-gel transitions.
• Encapsulated L929 cells showed high viability and cytocompatibility.
• In vitro degradation was accelerated by proteinase K.
• In vivo studies indicated a 21-day duration and acceptable biocompatibility.
• Galactose functionalization improved cell adhesion, potentially via fibronectin adsorption.

Conclusions:

• Novel functionalizable thermosensitive PEG-PPLG hydrogels demonstrate excellent cytocompatibility and tunable degradation.
• These hydrogels serve as a versatile platform for biofunctional materials in tissue engineering and regenerative medicine.
• Functionalization, particularly with galactose, enhances cell adhesion, paving the way for bioadhesive and bioresponsive applications.