Cross-linked open-pore elastic hydrogels based on tropoelastin, elastin and high pressure CO2

Area of Science:

• Biomaterials Science
• Materials Engineering
• Tissue Engineering

Background:

• Elastin-based hydrogels are promising biomaterials for tissue regeneration.
• Fabrication methods influence hydrogel characteristics crucial for biological applications.

Purpose of the Study:

• To investigate the impact of high pressure carbon dioxide (CO2) on the synthesis and properties of elastin-based hybrid hydrogels.
• To evaluate how CO2 processing affects hydrogel porosity, swelling, mechanical strength, and cell interaction.

Main Methods:

• Tropoelastin/alpha-elastin solutions were cross-linked using glutaraldehyde under high pressure CO2.
• Hydrogel characteristics including pore size, swelling ratio, and mechanical properties (compressive and tensile modulus) were analyzed.
• In vitro studies assessed human skin fibroblast cell migration into the hydrogels.

Main Results:

• High pressure CO2 fabrication eliminated surface skin formation and created larger pores (78 ± 17 µm).
• Hydrogels fabricated under high pressure CO2 exhibited lower swelling ratios due to increased cross-linking.
• Mechanical properties were significantly enhanced: compressive modulus increased 2-fold and tensile modulus 2.5-fold at 60 bar.
• Cell migration of 300 µm into the hydrogel matrix was observed.

Conclusions:

• High pressure CO2 is an effective method for fabricating elastin-based hydrogels with improved characteristics.
• The enhanced porosity and mechanical strength promote better cell infiltration, suggesting potential for advanced tissue engineering scaffolds.