Reversible light-responsive protein hydrogel for on-demand cell encapsulation and release.

Area of Science:

• Biomaterials Science
• Protein Engineering
• Light-Responsive Materials

Background:

• Developing on-demand reconfigurable biomaterials is a key challenge in materials research.
• Achieving reversible light-induced assembly in protein-based biomaterials is difficult.
• Existing light-responsive biomaterials are often irreversible, limiting their reusability.

Purpose of the Study:

• To engineer a new protein material capable of reversible liquid-to-solid state switching controlled by light.
• To demonstrate the material's biocompatibility and utility in cell encapsulation and release.
• To establish a design principle for adaptive biomaterials interfacing with biological systems.

Main Methods:

• Incorporating a light-responsive Dronpa protein domain into Elastin-Like Proteins (DELPs).
• Utilizing different wavelengths of light to control material state transitions.
• Assessing material biocompatibility through long-term cell proliferation studies.

Main Results:

• The engineered DELP material demonstrated robust, reversible switching between hydrogel and solution states upon light stimulation.
• The material supported long-term cell proliferation, showing biocompatibility for both adherent and suspension cells.
• Efficient cell encapsulation and subsequent light-triggered release were successfully demonstrated.

Conclusions:

• This work presents a new class of "smart" biomaterials with reversible light-controlled assembly.
• The developed DELP material offers advantages over conventional irreversible materials, enabling reusability and precise control.
• The design principle is applicable to a wide range of adaptive material applications in biology and medicine.