Antiviral Activities of Different Interferon Types and Subtypes against Hepatitis E Virus Replication

Antimicrobial Agents and Chemotherapy
Daniel TodtEike Steinmann

Abstract

Hepatitis E virus (HEV) is the causative agent of hepatitis E in humans and a member of the genusOrthohepevirusin the familyHepeviridae HEV infections are the common cause of acute hepatitis but can also take chronic courses. Ribavirin is the treatment of choice for most patients, and type I interferon (IFN) has been evaluated in a few infected transplant patientsin vivo In this study, the antiviral effects of different exogenously administered interferons were investigated by using state-of-the-art subgenomic replicon and full-length HEV genome cell culture models. Hepatitis C virus (HCV) subgenomic replicons based on the genotype 2a JFH1 isolate served as the reference. The experiments revealed that HEV RNA replication was inhibited by the application of all types of IFN, including IFN-α (type I), IFN-γ (type II), and IFN-λ3 (type III), but to a far lesser extent than HCV replication. Simultaneous determination of interferon-stimulated gene (ISG) expression levels for all IFN types demonstrated efficient downregulation by HEV. Furthermore, different IFN-α subtypes were also able to block viral replication in combination with ribavirin. The IFN-α subtypes 2a and 2b exerted the strongest antiviral activity against HEV. In concl...Continue Reading

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