Caged peptides to control enzymatic activity within hydrogel scaffolds

Area of Science:

• Biomaterials engineering
• Tissue engineering
• Cell biology

Background:

• 3D bioprinting and tissue engineering require precise control over cell microenvironments.
• Spatial control of cell-signaling motifs is crucial for directing cell behavior and tissue development.
• Existing methods for creating 3D cell-instructive materials have limitations in spatial resolution and biochemical control.

Purpose of the Study:

• To develop a novel enzyme-assisted 3D lithography technique for precise spatial patterning of biomolecules.
• To demonstrate the ability to anchor cell-signaling motifs within a hydrogel framework using transglutaminase factor XIIIa (FXIIIa).
• To enable the creation of spatially defined cell niches for advanced tissue engineering applications.

Main Methods:

• A peptide substrate for FXIIIa was synthesized and modified with a photo-deprotectable group.
• The modified peptide substrate was immobilized within a hydrogel matrix.
• Multiphoton light was used to selectively uncage the peptide substrate at specific locations.
• The uncaged substrate facilitated the anchoring of cell-signaling motifs via FXIIIa activity.

Main Results:

• Successful spatial-specific decaging of the peptide substrate within the hydrogel was achieved using multiphoton lithography.
• Demonstrated the ability to anchor cell-signaling motifs in a highly localized manner.
• The enzyme-assisted approach provides high spatial resolution for biomolecule immobilization.

Conclusions:

• Enzyme-assisted 3D lithography offers a powerful tool for creating complex, spatially defined 3D biomaterial architectures.
• This technique enables precise control over the presentation of cell-instructive cues, advancing tissue engineering and regenerative medicine.
• The method holds promise for fabricating intricate tissue constructs with tailored biological functions.