NTCP-Reconstituted In Vitro HBV Infection System

Area of Science:

• Hepatology
• Virology
• Cell Biology

Background:

• Hepatitis B virus (HBV) infection poses a significant global health challenge.
• Sodium taurocholate cotransporting polypeptide (NTCP) is a key functional receptor for HBV entry into hepatocytes.
• Developing robust cell culture models is crucial for understanding HBV pathogenesis and antiviral development.

Purpose of the Study:

• To establish and optimize protocols for efficient HBV infection of HepG2 cells expressing human NTCP (HepG2-NTCP).
• To provide a reliable platform for studying HBV life cycle, including covalently closed circular DNA (cccDNA) formation.
• To facilitate the discovery of novel antiviral agents targeting HBV infection.

Main Methods:

• Generation and selection of stable HepG2-NTCP single-cell clones.
• Production of infectious HBV virion stock via DNA transfection of recombinant plasmids.
• Optimization of HBV infection conditions, including inoculum source and infection medium.
• Assessment of HBV infection using immunostaining for viral antigens and Southern blot analysis for HBV cccDNA.

Main Results:

• Detailed protocols for efficient HBV infection of HepG2-NTCP cells were established.
• Methods for generating and selecting HepG2-NTCP clones and producing infectious HBV virions were optimized.
• The study demonstrated the utility of the HepG2-NTCP model for analyzing HBV infection markers, including cccDNA.

Conclusions:

• The HepG2-NTCP cell line provides an accessible and valuable platform for studying HBV infection.
• Optimized protocols enable efficient HBV infection and analysis of viral replication intermediates.
• This model system supports the development of new therapeutic strategies against HBV.