Chip-based three-dimensional cell culture in perfused micro-bioreactors

Area of Science:

• Biotechnology
• Cell Biology
• Bioengineering

Background:

• Traditional cell culture methods like monolayer cultures often fail to replicate the complex in vivo microenvironment.
• Three-dimensional (3D) cell culture systems are crucial for studying cellular behavior, drug responses, and tissue engineering.
• Existing 3D systems may face limitations in nutrient/gas exchange and scalability.

Purpose of the Study:

• To develop and characterize a novel chip-based system for efficient three-dimensional cell cultivation.
• To evaluate the system's capability for long-term culture of various cell types, including primary cells and cell lines.
• To assess the functional preservation and gene expression profiles of cells cultured in the 3D system.

Main Methods:

• Fabrication of microfluidic chips from polymers (e.g., polycarbonate) using micro-molding techniques.
• Design features include micro-containers (120-300 x 300 x 300 micron) or round recesses (300 micron diameter/depth).
• Integration of chips into a closed-loop bioreactor system supporting perfusion and superfusion culture modes.

Main Results:

• Successful long-term cultivation (several weeks) of both cell lines and primary cells.
• Demonstrated preservation of organotypic functions in rat primary liver cells for over two weeks.
• Observed induction of liver-specific genes in hepatocellular carcinoma cell lines, which are poorly expressed in monolayer cultures.
• Promising initial results in stem cell differentiation experiments.

Conclusions:

• The developed chip-based bioreactor system provides a robust platform for advanced 3D cell culture.
• It effectively supports the long-term maintenance of cellular functions and facilitates the study of cell behavior in a more physiologically relevant context.
• The system holds potential for applications in drug screening, disease modeling, and regenerative medicine, including stem cell research.