Mussel-Inspired Cell/Tissue-Adhesive, Hemostatic Hydrogels for Tissue Engineering Applications

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Polymer Chemistry

Background:

• Integrating multiple physiological and biological properties into a single hydrogel is crucial for skin tissue engineering.
• Polydopamine (PDA)-based adhesive hydrogels are promising but face challenges in combining diverse functionalities.
• Mussel-inspired chemistry offers a route to develop advanced biomaterials with multiple properties.

Purpose of the Study:

• To develop novel polydopamine-sodium alginate-polyacrylamide (PDA-SA-PAM) hydrogels.
• To imbue these hydrogels with multiple physiological (swelling, porosity, mechanical, biodegradation) and biological (adhesion, cell proliferation, hemostasis) properties.
• To evaluate their potential for skin tissue engineering applications.

Main Methods:

• Hydrogels synthesized via alkali-induced polymerization of dopamine followed by complexation with sodium alginate within polyacrylamide networks.
• Characterization of chemical composition using X-ray photoelectron spectroscopy.
• Assessment of mechanical properties, porosity, swelling, biodegradability, adhesion strength, cell interaction, and hemostatic activity.

Main Results:

• PDA-SA-PAM hydrogels demonstrated excellent elasticity and mechanical strength (0.24 MPa at 70% strain).
• High porosity (~94%) and outstanding swelling and biodegradability were observed.
• Significant adhesion to various substrates (24.5 kPa to porcine skin), enhanced cell proliferation and spreading, and rapid blood coagulation were achieved.

Conclusions:

• The developed mussel-inspired PDA-SA-PAM hydrogels successfully integrate multiple essential properties for skin tissue engineering.
• These hydrogels exhibit excellent biocompatibility, mechanical integrity, and adhesive capabilities.
• The findings highlight the substantial potential of these advanced hydrogels in regenerative medicine and skin repair.