Mouse A6-positive hepatic oval cells derived from embryonic stem cells

Area of Science:

• Stem cell biology
• Hepatology
• Cell differentiation

Background:

• Oval cells are crucial for liver regeneration and can differentiate into hepatocytes and biliary epithelia.
• Existing models for activating oval cells are unsuitable for studying human hepatic oval cells.
• A novel, efficient model is needed to investigate human hepatic oval cells.

Purpose of the Study:

• To establish an efficient method for deriving hepatic oval cells from mouse embryonic stem cells (ES cells).
• To investigate the role of hepatocyte growth factor (HGF) and epidermal growth factor (EGF) in inducing ES cell differentiation into hepatic oval cells.
• To characterize the properties and purity of ES-derived hepatic oval cells.

Main Methods:

• Induction of mouse ES cell differentiation using HGF and EGF.
• Flow cytometry (FACS) for sorting Sca-1+/CD34+ cells.
• Reverse transcription polymerase chain reaction (RT-PCR) and transmission electron microscopy (TEM) for cell characterization.
• Atomic force microscopy (AFM) to examine cell surface ultrastructures.

Main Results:

• HGF and EGF significantly increased the number of hepatic oval cells derived from ES cells.
• FACS analysis showed a marked increase in Sca-1+/CD34+ cells in the induction group, with high purity (92.48% A6 positive) achieved by day 8.
• The differentiation ratio of hepatic oval cells in the induction group (4.46%) was significantly higher than in the control group.
• ES-derived hepatic oval cells exhibited distinct ultrastructures.

Conclusions:

• Mouse ES cells can differentiate into bipotential hepatic oval cells under the influence of HGF and EGF.
• This protocol provides a highly purified population of ES-derived hepatic oval cells.
• The developed model holds potential for future clinical applications in liver research and therapy.