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Antimicrob Agents Chemother. 2019 Mar 18. pii: AAC.00003-19. doi: 10.1128/AAC.00003-19. [Epub ahead of print]

Antiviral candidates for treating hepatitis E virus infection.

Author information

1
School of Biotechnology and Biomolecular Sciences, Faculty of Science, University of New South Wales, Sydney, NSW, Australia.
2
Emerging Infectious Diseases Programme, Duke-NUS Medical School, Singapore.
3
Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, University of Melbourne, VIC, Australia.
4
School of Biotechnology and Biomolecular Sciences, Faculty of Science, University of New South Wales, Sydney, NSW, Australia p.white@unsw.edu.au.

Abstract

Globally, hepatitis E virus (HEV) causes significant morbidity and mortality each year. Despite this burden, there are no specific antivirals available to treat HEV patients, and the only licensed vaccine is not available outside of China. Ribavirin and interferon-α are used to treat chronic HEV infections, however severe side effects and treatment failure are commonly reported. Therefore, this study aimed to identify potential antivirals for further development to combat HEV infection. We selected 16 compounds from the nucleoside and non-nucleoside antiviral classes that range in developmental status from late preclinical to FDA-approved, and evaluated them as potential antivirals for HEV infection, using genotype 1 replicon luminescence studies and replicon RNA quantification. Two potent inhibitors of HEV replication included NITD008 (EC50 0.03 μM, CC50 >100 μM) and GPC-N114 (EC50 1.07 μM, CC50 >100 μM), and both drugs reduced replicon RNA levels in cell culture (>50% reduction with either 10 μM GPC-N114 or 2.50 μM NITD008). Furthermore, GPC-N114 and NITD008 were synergistic in combinational treatment (combination index 0.4) against HEV replication, allowing for dose reduction indices of 20.42 and 8.82 at 50% inhibition, respectively. Sofosbuvir has previously exhibited mixed results against HEV as an antiviral, both in vitro and in a handful of clinical applications, however in this study it was effective against the HEV genotype 1 replicon (EC50 1.97 μM, CC50 >100 μM) and reduced replicon RNA levels (47.2% reduction at 10 μM). Together these studies indicate drug repurposing may be a promising pathway for development of antivirals against HEV infection.

PMID:
30885901
DOI:
10.1128/AAC.00003-19

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