Multilayer rat hepatocyte aggregates formed on expanded polytetrafluoroethylene surface.

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Hepatocyte culture is crucial for liver research and artificial liver development.
• Expanded polytetrafluoroethylene (ePTFE) is a macroporous material with potential for cell scaffolding.
• Optimizing hepatocyte morphology and function in vitro remains a challenge.

Purpose of the Study:

• To evaluate the feasibility of using ePTFE as a scaffold for culturing adult rat hepatocytes.
• To investigate the influence of culture medium and ePTFE surface modification on hepatocyte organization and differentiation.
• To assess the potential of ePTFE-cultured hepatocytes for artificial liver bioreactor applications.

Main Methods:

• Adult rat hepatocytes were cultured on ePTFE surfaces, with and without polyvinylalcohol (PVA) coating.
• Cultures were supplemented with fetal calf serum (FCS) or bovine serum albumin (BSA) or were serum-free.
• Hepatocyte morphology, aggregate formation, albumin expression, and DNA synthesis were analyzed.

Main Results:

• Hepatocytes formed multilayer aggregates on ePTFE in serum-supplemented media, particularly on PVA-coated surfaces.
• Serum-free or uncoated ePTFE surfaces promoted monolayer formation.
• Hepatocyte aggregates exhibited higher albumin expression and lower DNA synthesis compared to monolayers.
• PVA-coated ePTFE in serum-supplemented medium supported morphologically and functionally differentiated hepatocyte aggregates.

Conclusions:

• ePTFE is a suitable material for culturing hepatocytes, promoting the formation of differentiated multilayer aggregates.
• Surface modification (PVA coating) and culture medium composition significantly influence hepatocyte organization and function.
• This ePTFE-based system offers a promising model for developing hepatocyte-based bioreactors, including hybrid artificial livers.