Peptide-functionalized oxime hydrogels with tunable mechanical properties and gelation behavior

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Hydrogels are crucial for tissue engineering due to their biocompatibility and ability to mimic the extracellular matrix.
• Controlling hydrogel properties and incorporating biomolecules post-fabrication remains a challenge.

Purpose of the Study:

• To develop polyethylene glycol (PEG)-based hydrogels with tunable mechanical properties.
• To demonstrate 3D patterning of peptides within the hydrogel matrix after gelation using click chemistry and thiol-ene reactions.
• To create versatile hydrogel materials for soft tissue engineering applications.

Main Methods:

• Hydrogel formation via oxime ligation and photoinitiated thiol-ene reactions.
• Tuning gelation time and mechanical strength using pH and catalyst concentration.
• Post-gelation peptide incorporation using Huisgen 1,3 cycloaddition and thiol-ene radical reactions.

Main Results:

• Achieved rapid gelation (seconds) and tunable storage modulus (0.3 to >15 kPa).
• Successfully demonstrated spatially defined peptide patterning within the hydrogel matrix post-gelation.
• Synthesized azide- and alkene-functionalized hydrogels for versatile click chemistry applications.

Conclusions:

• Developed PEG-based hydrogels with tunable mechanical properties and rapid gelation.
• Established efficient post-gelation peptide patterning methods for creating advanced biomaterials.
• These hydrogels show promise for soft tissue engineering and cell patterning applications.