Formation and characterization of hepatocyte spheroids

Area of Science:

• Hepatology
• Cell Biology
• Tissue Engineering

Background:

• Freshly harvested hepatocytes spontaneously self-assemble into three-dimensional, suspended aggregates called spheroids.
• These hepatocyte spheroids exhibit enhanced liver-specific functions and prolonged viability compared to traditional monolayer cultures.
• The ultrastructure of hepatocyte spheroids, including cell-cell contacts and bile canaliculi-like channels, closely resembles in vivo liver lobules.

Purpose of the Study:

• To investigate the self-assembly of hepatocytes into three-dimensional spheroids.
• To characterize the functional and structural properties of hepatocyte spheroids.
• To explore the potential applications of hepatocyte spheroids in tissue engineering and drug metabolism studies.

Main Methods:

• Primary hepatocyte isolation and spheroid formation in suspension culture.
• Microscopy (light and electron) to assess spheroid morphology and ultrastructure.
• Assays to measure liver-specific functions and cell viability.

Main Results:

• Hepatocytes successfully self-assembled into spherical aggregates (spheroids) approximately 120 µm in diameter.
• Spheroids displayed enhanced liver-specific activities and significantly longer cell viability than monolayer cultures.
• Ultrastructural analysis revealed extensive cell-cell contacts, tight junctions, and microvilli-lined channels resembling bile canaliculi.

Conclusions:

• Hepatocyte spheroid formation is a natural process that enhances cellular function and viability.
• The tissue-like architecture of hepatocyte spheroids makes them a promising model for in vitro liver studies.
• Hepatocyte spheroids hold significant potential for applications in drug metabolism and liver tissue engineering.