Independent control over cell patterning and adhesion on hydrogel substrates for tissue interface mechanobiology

Area of Science:

• Biomaterials Engineering
• Cellular Engineering
• Tissue Engineering

Background:

• Tissue boundaries are crucial for morphogenesis in vivo.
• In vitro tissue engineering faces challenges in precisely controlling cell positioning.
• Existing micropatterning methods offer limited fine-scale spatial control of cells.

Purpose of the Study:

• To develop a new technique for precise spatial control of cell positioning in engineered tissues.
• To combine DNA velcro technology with extracellular matrix (ECM) functionalization for enhanced tissue engineering.
• To enable advanced mechanobiology studies at dynamic cell interfaces.

Main Methods:

• Augmented DNA "velcro" technology for selective patterning of single-stranded DNA (ssDNA)-labeled cells.
• Utilized mechanically defined photoactive polyacrylamide hydrogels for cell capture.
• Co-functionalized hydrogels with extracellular matrix (ECM) proteins to support tissue adhesion.

Main Results:

• Achieved precise initial cell patterning on hydrogels using ssDNA features.
• Demonstrated that ECM co-functionalization preserves ssDNA pattern fidelity, cell capture, and hydrogel stiffness.
• Enabled independent control over initial cell placement, adhesion, and mechanics.

Conclusions:

• The combined DNA velcro and ECM functionalization approach provides a powerful new tool for biological interface studies.
• This method allows for precise programming of multicellular interactions in engineered tissues.
• Facilitates mechanobiology studies and signaling activity measurements at dynamic cell interfaces.