Cre/loxP-based reversible immortalization of human hepatocytes

Area of Science:

• Hepatology
• Cell Biology
• Biotechnology

Background:

• Primary human hepatocytes are crucial for transplantation but face limitations in availability and scalability.
• Developing a renewable and functional cell source is essential for advancing hepatocyte transplantation therapies.

Purpose of the Study:

• To establish a reversibly immortalized human hepatocyte cell line for potential therapeutic applications.
• To ensure the cell line maintains differentiated liver functions and exhibits nontransformed characteristics.

Main Methods:

• Human hepatocytes were immortalized using a retroviral vector (SSR#69) expressing the simian virus 40 large T antigen (SV40Tag) gene.
• The immortalized clone NKNT-3 was characterized for morphological and functional hepatic differentiation.
• Adenovirus-mediated Cre recombinase delivery enabled site-specific excision of the SV40Tag gene for reversibility.

Main Results:

• The NKNT-3 clone displayed morphological features of liver parenchymal cells and expressed key differentiated liver function genes.
• NKNT-3 cells demonstrated unlimited proliferative capacity in culture.
• Efficient removal of the SV40Tag gene was achieved, confirming the reversibility of immortalization.

Conclusions:

• The development of the NKNT-3 cell line provides a scalable and functional alternative to primary human hepatocytes.
• Reversible immortalization using site-specific recombination offers a controlled method for generating therapeutic hepatocyte cell populations.
• This cell line holds significant potential for hepatocyte transplantation and regenerative medicine applications.