Human hepatocyte clonal cell lines that support persistent replication of hepatitis C virus

Area of Science:

• Hepatology
• Virology
• Cell Biology

Background:

• Hepatitis C virus (HCV) infection poses a significant global health challenge.
• Previous studies identified susceptibility of MT-2 cells to HCV and developed persistent replication models.
• Non-neoplastic hepatocyte lines, like PH5CH, show promise for HCV research.

Purpose of the Study:

• To develop and characterize hepatocyte cell clones supporting persistent hepatitis C virus (HCV) replication.
• To investigate factors influencing HCV replication and release in vitro.
• To establish a robust system for antiviral drug screening.

Main Methods:

• Cloning of PH5CH hepatocyte cells to isolate clones with enhanced HCV replication.
• Semi-quantitative analysis of intracellular and extracellular HCV RNA.
• Assessment of HCV RNA levels after proteinase K treatment to evaluate internalization.
• Evaluation of HCV replication persistence under reduced culture temperature (32°C).
• Testing the antiviral effect of interferon-alpha on HCV-infected cells.

Main Results:

• Three PH5CH clones (PH5CH1, PH5CH7, PH5CH8) supported detectable HCV RNA for at least 25 days post-inoculation.
• These clones released infectious HCV into the culture medium.
• PH5CH1, PH5CH7, and PH5CH8 cells contained 10-fold higher intracellular HCV RNA compared to parental cells.
• HCV replication was sustained for 70-100 days at 32°C.
• Interferon-alpha demonstrated antiviral activity against HCV in PH5CH8 cells.

Conclusions:

• The developed PH5CH clones provide a robust in vitro model for persistent HCV replication.
• These cell lines facilitate the study of HCV replication dynamics and release mechanisms.
• The clones are valuable for developing and validating antiviral agents against HCV.