Two-dimensional microarray of HepG2 spheroids using collagen/polyethylene glycol micropatterned chip

Area of Science:

• Biotechnology
• Cell Biology
• Materials Science

Background:

• HepG2 cells are a human liver cancer cell line widely used in research.
• Spheroids offer a more physiologically relevant 3D cell culture model compared to 2D monolayers.
• Developing controlled methods for spheroid formation and arrangement is crucial for advanced cell-based assays.

Purpose of the Study:

• To develop a novel cell chip technology for creating two-dimensional microarrays of HepG2 spheroids.
• To investigate the control over spheroid size and morphology using microcontact printing.
• To assess the albumin secretion activity of HepG2 spheroids based on their diameter.

Main Methods:

• Utilized microcontact printing to create a microarray chip with collagen spots for cell adhesion and polyethylene glycol (PEG) for non-adhesion.
• Inoculated HepG2 cells onto the chip, allowing them to proliferate and form spheroids on the collagen spots.
• Cultured the spheroids for up to 2 weeks and monitored their morphology, diameter, and albumin secretion.

Main Results:

• Successfully fabricated a two-dimensional microarray of HepG2 spheroids on a collagen-patterned chip.
• HepG2 spheroids exhibited smooth surfaces and high circularity, maintaining their structure for at least 2 weeks.
• Spheroid diameter was found to be directly proportional to the pitch between collagen spots, enabling controlled size.
• Albumin secretion activity increased with increasing spheroid diameter.

Conclusions:

• The developed cell chip technology provides a controllable platform for generating two-dimensional HepG2 spheroid microarrays.
• This technology allows for artificial control over spheroid diameter, which influences cellular function (albumin secretion).
• The platform holds potential for applications in drug screening, toxicology studies, and other cell-based assays.