An Injectable Self-Healing Protein Hydrogel with Multiple Dissipation Modes and Tunable Dynamic Response.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Drug Delivery

Background:

• Dynamic mechanical properties of hydrogels are crucial for tissue engineering and drug delivery.
• Tailoring hydrogel responses for diverse applications remains a significant challenge.

Purpose of the Study:

• To develop a protein hydrogel with tunable dynamic mechanical properties and multiple energy dissipation modes.
• To investigate the hydrogel's injectability, rapid recovery, and responsiveness to stimuli.

Main Methods:

• Fabrication of a protein hydrogel cross-linked via a hetero-coiled-coil complex.
• Characterization of dynamic mechanical properties across a range of frequencies.
• Evaluation of shear-thinning behavior and mechanical property recovery.

Main Results:

• The hydrogel exhibits unusual multiple energy dissipation modes and tunable dynamic response.
• Achieved injectability due to shear-thinning at low shear rates (0.8 rad s⁻¹).
• Demonstrated rapid mechanical property recovery within seconds.
• Showcased tunability of dynamic response via temperature and network structure.

Conclusions:

• The developed protein hydrogel offers a promising platform for biomedical applications.
• Its unique properties facilitate effective delivery of therapeutics, biological molecules, and cells.
• The tunable nature allows for adaptation to a broad spectrum of needs in tissue engineering and drug delivery.