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A Cell Culture Model for Producing High Titer Hepatitis E Virus Stocks
Published on: June 26, 2020
Development and evaluation of an efficient cell-culture system for Hepatitis E virus
Toshinori Tanaka1, Masaharu Takahashi1, Eiji Kusano2
1Division of Virology, Department of Infection and Immunity, Jichi Medical University School of Medicine, Tochigi-Ken 329-0498, Japan.
The Journal of General Virology
|February 28, 2007
Summary
Researchers developed an efficient cell-culture system for Hepatitis E virus (HEV) using PLC/PRF/5 cells. This system demonstrated HEV replication and confirmed broad cross-reactivity and long-lasting neutralizing activity of HEV antibodies.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- Hepatitis E virus (HEV) infection poses a significant global health challenge.
- Efficient cell-culture systems are crucial for studying HEV replication and developing antiviral strategies.
- Previous attempts to culture HEV in vitro have faced limitations.
Purpose of the Study:
- To establish an efficient cell-culture system for Hepatitis E virus (HEV) replication.
- To investigate the characteristics of HEV propagation in a hepatocarcinoma cell line.
- To assess the neutralizing capacity and longevity of HEV-specific antibodies.
Main Methods:
- Development of a cell-culture system using a hepatocarcinoma cell line (PLC/PRF/5) inoculated with a high-load fecal suspension of HEV genotype 3.
- Successive passaging of HEV progeny in PLC/PRF/5 cells over five generations.
- Inoculation with varying HEV titers to determine the impact on replication kinetics.
- Incubation of HEV at different temperatures to assess thermal stability.
- Neutralization assays using convalescent serum samples from patients with past HEV infections of various genotypes.
Main Results:
- An efficient HEV cell-culture system was established in PLC/PRF/5 cells, allowing for viral replication and serial passaging.
- HEV RNA was detected in culture supernatant, with detection time and viral load dependent on the initial inoculum titer.
- Optimal HEV replication occurred at temperatures below 70°C, with infectious virus maintained after incubation at 56°C for 30 minutes.
- Convalescent serum samples, including those from patients infected years prior, demonstrated broad cross-neutralizing activity against genotype 3 HEV, indicating long-lasting protective immunity.
Conclusions:
- The developed cell-culture system provides a valuable tool for studying HEV pathogenesis and evaluating antiviral therapies.
- HEV antibodies exhibit broad cross-reactivity across different genotypes.
- Long-lasting neutralizing antibodies are present in individuals with a history of HEV infection, suggesting durable protective immunity.
