Liver tissue engineering: a role for co-culture systems in modifying hepatocyte function and viability

Area of Science:

• Biotechnology
• Cell Biology
• Tissue Engineering

Background:

• Hepatocyte survival and function in culture are limited, hindering engineered liver development.
• Cell-cell interactions are critical for maintaining hepatocyte behavior in engineered tissues.

Purpose of the Study:

• To investigate the potential of 3T3 fibroblast cells in co-culture to modulate the function and viability of primary isolated rat hepatocytes.
• To assess the long-term effects of heterotypic cell-cell interactions on hepatocyte behavior in vitro.

Main Methods:

• Primary rat hepatocytes were isolated and cultured either alone or in co-culture with 3T3 fibroblast cells for 18 days.
• Hepatocyte viability, bile canaliculi formation, albumin secretion, and ethoxyresorufin O-dealkylase (EROD) activity were assessed.

Main Results:

• Hepatocytes in pure culture showed rapid decline in viability, poor bile canaliculi, and loss of albumin secretion and EROD activity.
• Co-cultured hepatocytes maintained viability, developed well-formed canalicular systems, and retained both functional markers.
• Neither fixed 3T3 cells nor conditioned medium could replicate the benefits of viable co-culture.

Conclusions:

• Viable 3T3 fibroblast cells in a co-culture system are essential for preserving the viability and functionality of primary rat hepatocytes.
• Heterotypic cell-cell interactions are key to maintaining hepatocyte performance in engineered liver constructs.
• This co-culture approach shows promise for improving engineered liver tissue development.