Photocontrolled DNA nanotubes as stiffness tunable matrices for controlling cellular behavior.

Area of Science:

• Biomaterials Science
• Cell Biology
• Nanotechnology

Background:

• Cell behavior is significantly influenced by the extracellular environment, including matrix stiffness.
• Dynamic changes in matrix stiffness are crucial in biological processes such as wound healing, tumorigenesis, and development.
• These stiffness changes impact cell morphology, signaling, migration, and cytoskeleton dynamics.

Purpose of the Study:

• To create photocontrolled, stiffness-tunable DNA nanotubes.
• To investigate the reversible conformational changes of these nanotubes upon UV and VIS irradiation.
• To explore the utility of these tunable nanotubes as a substrate for observing cell morphology changes.

Main Methods:

• Fabrication of photocontrolled stiffness-tunable DNA nanotubes.
• Irradiation of nanotubes with UV and VIS light to induce reversible conformational changes.
• Utilizing the DNA nanotubes as a cell culture substrate for HeLa cells.
• Observing and analyzing changes in cell morphology in response to nanotube stiffness modulation.

Main Results:

• The DNA nanotubes demonstrated reversible stiffness tuning upon UV and VIS light exposure.
• HeLa cells cultured on these nanotubes exhibited altered morphology.
• Cells transitioned from a spindle-shaped morphology with long filopodia to a round morphology with short filopodia-like extrusions.
• The study successfully demonstrated photocontrolled modulation of cell morphology via nanotube stiffness.

Conclusions:

• Photocontrolled DNA nanotubes offer a novel platform for studying dynamic cell-matrix interactions.
• This nanosystem provides insights into how nanoscopic stiffness changes in the extracellular matrix affect cell behavior.
• The reversible nature of the DNA nanotubes allows for precise control over the cellular microenvironment.