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Antimicrob Agents Chemother. 2015;59(6):3482-92. doi: 10.1128/AAC.00223-15. Epub 2015 Apr 6.

Fast hepatitis C virus RNA elimination and NS5A redistribution by NS5A inhibitors studied by a multiplex assay approach.

Author information

1
Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, USA Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, USA.
2
The Rockefeller University, Laboratory of Virology and Infectious Disease, New York, New York, USA.
3
Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas City, Kansas, USA.
4
Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, Missouri, USA Department of Molecular Microbiology and Immunology, University of Missouri School of Medicine, Columbia, Missouri, USA Department of Biochemistry, University of Missouri, Columbia, Missouri, USA sarafianoss@missouri.edu.

Abstract

While earlier therapeutic strategies for the treatment of hepatitis C virus (HCV) infection relied exclusively on interferon (IFN) and ribavirin (RBV), four direct-acting antiviral agents (DAAs) have now been approved, aiming for an interferon-free strategy with a short treatment duration and fewer side effects. To facilitate studies on the mechanism of action (MOA) and efficacy of DAAs, we established a multiplex assay approach, which employs flow cytometry, a Gaussia luciferase reporter system, Western blot analysis, reverse transcription-quantitative PCR (RT-qPCR), a limited dilution assay (50% tissue culture infectious dose [TCID50]), and an image profiling assay that follows the NS5A redistribution in response to drug treatment. We used this approach to compare the relative potency of various DAAs and the kinetics of their antiviral effects as a potential preclinical measure of their potential clinical utility. We evaluated the NS5A inhibitors ledipasvir (LDV) and daclatasvir (DCV), the NS3/4A inhibitor danoprevir (DNV), and the NS5B inhibitor sofosbuvir (SOF). In terms of kinetics, our data demonstrate that the NS5A inhibitor LDV, followed closely by DCV, has the fastest effect on suppression of viral proteins and RNA and on redistribution of NS5A. In terms of MOA, LDV has a more pronounced effect than DCV on the viral replication, assembly, and infectivity of released virus. Our approach can be used to facilitate the study of the biological processes involved in HCV replication and help identify optimal drug combinations.

PMID:
25845863
PMCID:
PMC4432190
DOI:
10.1128/AAC.00223-15
[Indexed for MEDLINE]
Free PMC Article

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