Light-Responsive Bilayer Cell Culture Platform for Reversible Cell Guidance

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Cellular functions are regulated by dynamic microenvironments.
• Stimuli-responsive biomaterials aim to replicate in vitro cell-extracellular matrix interactions.
• Noninvasive control of dynamic signaling without impacting cell viability is challenging.

Purpose of the Study:

• To develop a dynamic cell culturing platform with light-controllable topography.
• To investigate the reversible photomodulation of surface relief gratings (SRGs) for cell guidance.
• To combine microtopography and protein patterning for advanced cell-material interaction studies.

Main Methods:

• Fabrication of a light-responsive azobenzene molecular glass film with a polydimethylsiloxane (PDMS) coating.
• Photoinscription and light-induced erasure of surface relief gratings (SRGs) on the platform.
• Microcontact printing for protein patterning and biofunctionalization.

Main Results:

• Reversible photomodulation of SRGs was achieved by tuning PDMS thickness and light exposure.
• Inscribed SRGs successfully guided epithelial cell orientation.
• The platform supported live cell experiments and allowed for combined topographical and biochemical patterning.

Conclusions:

• The developed platform enables dynamic control over cell-material interactions through reconfigurable microenvironments.
• The PDMS coating protects the underlying material, expanding options for dynamic cell culture platforms.
• This technology offers new avenues for studying cellular responses to dynamic, engineered environments.