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Low-density cell culture enhances hepatic function through tight junction formation in HepG2 cells
Rieko Tanaka-Yachi1, Kazuko Aizawa1, Kie Shimizu1,2
1Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo, Japan.
Biology of the Cell
|May 23, 2022
Summary
Low-density HepG2 cell culture enhances liver function by improving tight junctions. This finding is crucial for accurate preclinical drug metabolism and toxicity testing using hepatocyte models.
Area of Science:
- Hepatology
- Cell Biology
- Pharmacology
Background:
- In vitro models using cultured hepatocytes are vital for preclinical drug metabolism and toxicity testing.
- Human hepatocytes are preferred due to species-specific drug-metabolizing enzyme expression.
- HepG2 cells, a common liver cancer cell line model, exhibit limited hepatic functions.
Purpose of the Study:
- To investigate the effect of cell culture density on HepG2 cell hepatic function.
- To determine the role of tight junction formation in modulating HepG2 cell function.
- To identify key molecular regulators involved in density-dependent hepatic function enhancement.
Main Methods:
- Culturing HepG2 cells at varying densities.
- Assessing cell morphology and tight junction formation.
- Quantifying gene expression of tight junction proteins, metabolic enzymes, and transporters.
- Performing gene knockdown experiments (occludin, tricellulin) to assess functional impact.
- Measuring CYP3A4 activity and expression of key transcription factors.
Main Results:
- Low-density HepG2 cell culture altered cell morphology and promoted tight junction formation.
- Significant increases in tight junction protein genes (ZO-1, JAM, claudin, occludin, tricellulin) were observed in low-density cultures.
- Expression of Phase I, II, and III drug-metabolizing enzymes and transporters, along with CYP3A4 activity, were upregulated.
- Knockdown of occludin and tricellulin diminished the enhanced hepatic function.
- Tricellulin knockdown affected the expression of HNF6, CEBPA, AHR, and NR1H2.
Conclusions:
- Low-density culturing of HepG2 cells enhances hepatic function, primarily through improved tight junction formation.
- Cell density is a critical parameter influencing the reliability of HepG2 cells as a model for drug evaluation.
- Tight junction proteins, particularly occludin and tricellulin, play a key role in mediating these density-dependent functional improvements.
