Biodegradable poly(ethylene glycol) hydrogels crosslinked with genipin for tissue engineering applications

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Hydrogels are versatile biomaterials with applications in drug delivery and tissue regeneration.
• Developing biocompatible and tunable hydrogels is crucial for advancing tissue engineering.
• Poly(ethylene glycol) (PEG) hydrogels offer tunable properties but often require crosslinking for stability.

Purpose of the Study:

• To synthesize and characterize amino-terminated poly(ethylene glycol) (PEG-diamine) hydrogels crosslinked with genipin.
• To investigate the dissolution, swelling, and PEG-genipin release kinetics of these hydrogels.
• To evaluate the suitability of PEG-genipin hydrogels as substrates for smooth muscle cell adhesion and tissue engineering.

Main Methods:

• PEG-diamine hydrogels were synthesized and crosslinked using genipin.
• Dissolution, swelling, and PEG-genipin release studies were conducted under varying conditions (concentration, mass, temperature).
• Scanning electron microscopy (SEM) was used to analyze hydrogel morphology, and smooth muscle cell (SMC) adhesion assays were performed.

Main Results:

• The PEG-genipin hydrogels exhibited tunable water solubility with dissolution rates controllable from 3 minutes to over 100 days.
• The release of PEG-genipin was rapid within the first 24 hours, with higher initial release observed at 37°C compared to room temperature.
• SEM revealed porous hydrogel structures with altered surface morphology post-swelling, and SMC adhesion studies confirmed the hydrogel's suitability for cell seeding.

Conclusions:

• PEG-genipin hydrogels demonstrate tunable dissolution and controlled release profiles, making them adaptable for various applications.
• The porous structure and biocompatibility of these hydrogels support smooth muscle cell adhesion, highlighting their potential as scaffolds.
• Genipin-crosslinked PEG-diamine hydrogels present a promising platform for diverse tissue engineering strategies.