HepG2-Based Designer Cells with Heat-Inducible Enhanced Liver Functions

Area of Science:

• Hepatology
• Cell Biology
• Pharmacology

Background:

• Primary human hepatocytes are crucial for drug metabolism and toxicity studies but are difficult to obtain and raise ethical concerns.
• Previous work involved genetically modified murine hepatoma cell lines with inducible liver functions.

Purpose of the Study:

• To establish a human hepatoma cell line with heat-inducible liver functions as an alternative to primary human hepatocytes.
• To assess the potential of this new cell line for pharmacological research and bioartificial liver systems.

Main Methods:

• Genetically modified human hepatoma HepG2 cells (HepG2/8F_HS) by introducing eight liver-enriched transcription factor (LETF) genes.
• Utilized heat treatment (43 °C for 30 min) to induce LETF expression and liver functions.
• Employed three-dimensional spheroid cultures and DNA microarrays for comprehensive analysis.

Main Results:

• HepG2/8F_HS cells proliferated readily under normal conditions, allowing for large-scale preparation.
• Heat treatment induced cessation of proliferation and enhanced liver functions.
• Three-dimensional spheroid cultures further augmented liver function upon heat induction.
• Transcriptome analysis confirmed enhanced expression of liver function-related genes post-heat treatment.

Conclusions:

• The established HepG2/8F_HS cell line provides a scalable and inducible source of human liver function.
• This cell line serves as a promising alternative to primary human hepatocytes for drug discovery and bioartificial liver development.