Engineering a highly elastic bioadhesive for sealing soft and dynamic tissues.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Tissue injuries necessitate prompt closure for functional restoration.
• Current synthetic hydrogel adhesives often exhibit toxicity, poor elasticity, and weak adhesion to wet biological tissues.
• There is a need for advanced bioadhesives with enhanced biocompatibility and mechanical properties.

Purpose of the Study:

• To develop a novel stretchable composite hydrogel bioadhesive for tissue repair.
• To investigate the adhesion properties and elasticity of the engineered hydrogel.
• To evaluate the biocompatibility and potential application of the hydrogel in sealing elastic tissues.

Main Methods:

• Synthesized a composite hydrogel using gelatin methacrylol catechol (GelMAC) and poly(ethylene glycol) diacrylate (PEGDA) with ferric ions.
• Utilized chemical conjugation of catechol and methacrylate groups for tissue adhesion.
• Assessed hydrogel properties, adhesion strength, and biocompatibility through in vitro toxicity tests and an ex vivo lung model.

Main Results:

• The developed hydrogel demonstrated strong adhesion to wet tissue surfaces via chemical conjugation.
• Incorporation of PEGDA significantly enhanced the elasticity of the bioadhesive.
• Tunable physical properties and adhesion were achieved by varying the GelMAC/PEGDA ratio; in vitro tests confirmed biocompatibility.

Conclusions:

• A stretchable, biocompatible composite hydrogel bioadhesive was successfully engineered.
• The material exhibits tunable properties and strong adhesion, addressing limitations of current tissue adhesives.
• The developed hydrogel shows significant potential for sealing elastic tissues, as demonstrated in an ex vivo lung model.