Enzyme-assisted photolithography for spatial functionalization of hydrogels

Area of Science:

• Biomaterials Science
• Chemical Engineering
• Cell Biology

Background:

• Functional polymeric patterning is crucial for cell biology, tissue engineering, and medical diagnostics.
• Existing methods for hydrogel functionalization can be limited in throughput and specificity.

Purpose of the Study:

• To develop a novel enzyme-assisted photolithography (EAPL) method for high-throughput spatial functionalization of hydrogels.
• To create biologically responsive 2D patterns and 3D scaffolds for various applications.

Main Methods:

• Utilized a bisacrylated peptide crosslinker with protease-cleavable and photolabile moieties during hydrogel polymerization.
• Employed a two-step process: UV exposure for uncaging followed by protease development for specific gel digestion.
• Generated free amine groups for further functionalization at patterned areas.

Main Results:

• Demonstrated simultaneous topographical and functional patterning in poly(ethylene glycol) (PEG) hydrogels using caspase-3.
• Created 20 micrometer-wide line arrays with RGD-peptides for individual cell patterning.
• Fabricated microcavities functionalized with anti-CD19 for 600-fold B-cell enrichment.

Conclusions:

• EAPL is a versatile, biocompatible, and environmentally friendly platform for creating complex hydrogel patterns.
• The method facilitates the construction of biologically responsive materials for lab-on-a-chip systems and tissue engineering.
• The high throughput and specificity of EAPL enable advanced applications in regenerative medicine and diagnostics.