Interfacing SH-SY5Y human neuroblastoma cells with SU-8 microstructures

Area of Science:

• Biomaterials Engineering
• Neuroscience
• Cell Biology

Background:

• Developing advanced microenvironments is crucial for studying neuronal cell behavior.
• SH-SY5Y neuroblastoma cells are a valuable model for neuronal differentiation and function studies.
• Substrate topography can influence cellular physiology and network formation.

Purpose of the Study:

• To engineer quasi-three-dimensional (quasi-3D) microenvironments using SU-8 microwell structures.
• To investigate the effect of these microwell networks on SH-SY5Y cell resting membrane potential establishment.
• To determine if substrate topography influences neuronal network formation and function.

Main Methods:

• Fabrication of SU-8 photoresist microwell structures with and without microchannels.
• Culturing and differentiation of SH-SY5Y cells within the microwell networks.
• Evaluation of resting membrane potential using confocal microscopy and a potentiometric fluorescent dye (tetramethylrhodamine methyl ester).
• Quantitative analysis of intra/extracellular fluorescent intensity ratios.

Main Results:

• SH-SY5Y cells were successfully integrated into 100-microm diameter microwells.
• Neuronal-like networks were achieved using polyethylene glycol stamping and laminin coating.
• Cells within microwell network structures exhibited significantly higher resting membrane potential establishment compared to cells on flat substrates.
• The intra/extracellular fluorescent intensity ratio (R) was consistently higher in microwell structures on both day 5 and day 13 of differentiation.

Conclusions:

• SU-8 microwell network structures provide a superior microenvironment for promoting SH-SY5Y cell resting membrane potential establishment.
• Substrate topography engineering is a viable strategy to control and enhance neuronal cell function.
• These findings suggest potential applications in neurodegenerative disease modeling and regenerative medicine.