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Updated: Jun 20, 2026

Isolation and Quantification of Epstein-Barr Virus from the P3HR1 Cell Line
Published on: September 28, 2022
Inhibition of Epstein-Barr virus replication by small interfering RNA targeting the Epstein-Barr virus protease gene
Sylvie Larrat1, Patrice Morand, Ariane Bas
1UMI 3265, UJF-EMBL-CNRS, Unit of Virus Host Cell Interactions, Grenoble, France.
Background:
The Epstein-Barr virus (EBV) protease (PR), coded by the BVRF2 gene, is essential for the maturation of the viral capsid and viral DNA packaging during the late stage of the EBV lytic cycle. Like the other herpesvirus serine PRs, EBV PR could be a target for the inhibition of EBV replication. To date, no data have been reported on the inhibition of EBV PR messenger RNA (mRNA) by small interfering RNA (siRNA).
Methods:
In this study, siRNAs targeting EBV PR were delivered to the epithelial 293 cell line stably transfected with the complete B95-8 EBV episome. EBV DNA and PR mRNA were quantified by real-time PCR in cells and supernatant, protein expression was assessed by immunoblotting, and production of EBV infectious particles in the culture medium was measured by Raji cell superinfection.
Results:
The EBV PR mRNA within the cells was reduced by 73%, the PR protein by 35% and the amount of virus in the cell supernatant was drastically decreased by 86% or 95%, depending on the method.
Conclusions:
The strong effect of the siRNA targeting EBV PR on EBV replication attests to the crucial role played by EBV PR in the production of infectious particles and suggests that targeting this enzyme can be a new strategy against EBV-associated diseases where virus replication occurs.
Insights
Small interfering RNA (siRNA) effectively targets Epstein-Barr virus (EBV) protease (PR) mRNA, significantly reducing viral replication and infectious particle production. This demonstrates siRNA
Area of Science:
- Virology
- Molecular Biology
- RNA Interference
Background:
- Epstein-Barr virus (EBV) protease (PR) is vital for viral replication.
- EBV PR is a potential target for antiviral therapies.
- No prior studies investigated siRNA inhibition of EBV PR mRNA.
Purpose of the Study:
- To investigate the efficacy of siRNA in inhibiting EBV protease (PR) expression and replication.
- To assess the role of EBV PR in infectious particle production.
Main Methods:
- Utilized 293 cells with stable EBV episomes.
- Delivered siRNAs targeting EBV PR.
- Quantified EBV DNA, PR mRNA, and protein levels.
- Measured infectious EBV particle production via Raji cell superinfection.
Main Results:
- EBV PR mRNA reduced by 73%.
- EBV PR protein levels decreased by 35%.
- Viral production in supernatant reduced by 86-95%.
Conclusions:
- siRNA targeting EBV PR significantly inhibits viral replication.
- EBV PR plays a critical role in infectious particle formation.
- Targeting EBV PR with siRNA presents a novel therapeutic strategy for EBV-associated diseases.
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