Journal of Microbiology

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Methyltransferase of a cell culture-adapted hepatitis E inhibits the MDA5 receptor signaling pathway: Jinjong Myoung , Jeong Yoon Lee , Kang Sang Min; J. Microbiol. 2019;57(12):1126-1131. Published online November 22, 2019; DOI: https://doi.org/10.1007/s12275-019-9478-8

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Hepatitis E virus (HEV) is a causative agent of acute hepatitis and jaundice. The number of human infections is approximated to be over 20 million cases per year. The transmission is mainly via the fecal-oral route and contaminated water and food are considered to be a major source of infection. As a mouse model is not available, a recent development of a cell culture-adapted HEV strain (47832c) is considered as a very important tools for molecular analysis of HEV pathogenesis in cells. Previously, we demonstrated that HEV-encoded methyltransferase (MeT) encoded by the 47832c strain inhibits MDA5- and RIG-I-mediated activation of interferon β (IFN-β) promoter. Here, we report that MeT impairs the phosphorylation and activation of interferon regulatory factor 3 and the p65 subunit of NF-κB in a dose-dependent manner. In addition, the MeT encoded by the 47832c, but not that of HEV clinical or field isolates (SAR-55, Mex-14, KC-1, and ZJ-1), displays the inhibitory effect. A deeper understanding of MeTmediated suppression of IFN-β expression would provide basis of the cell culture adaptation of HEV.

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Viral Hepatitis: Host Immune Interaction, Pathogenesis and New Therapeutic Strategies
Angela Quirino, Nadia Marascio, Francesco Branda, Alessandra Ciccozzi, Chiara Romano, Chiara Locci, Ilenia Azzena, Noemi Pascale, Grazia Pavia, Giovanni Matera, Marco Casu, Daria Sanna, Marta Giovanetti, Giancarlo Ceccarelli, Pierfrancesco Alaimo di Loro,
Pathogens.2024; 13(9): 766. CrossRef
Hepatitis E virus: from innate sensing to adaptive immune responses
Yannick Brüggemann, Mara Klöhn, Heiner Wedemeyer, Eike Steinmann
Nature Reviews Gastroenterology & Hepatology.2024; 21(10): 710. CrossRef
Structural aspects of hepatitis E virus
Florencia Cancela, Ofelia Noceti, Juan Arbiza, Santiago Mirazo
Archives of Virology.2022; 167(12): 2457. CrossRef
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Chonghui Xu, Jizheng Chen, Xinwen Chen
Frontiers in Microbiology.2021;[Epub] CrossRef
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Sameer-ul-Salam Mattoo, Jinjong Myoung
Journal of Microbiology and Biotechnology.2021; 31(12): 1601. CrossRef
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Sébastien Lhomme, Marion Migueres, Florence Abravanel, Olivier Marion, Nassim Kamar, Jacques Izopet
Vaccines.2020; 8(3): 422. CrossRef
Chikungunya Virus nsP2 Impairs MDA5/RIG-I-Mediated Induction of NF-κB Promoter Activation: A Potential Target for Virus-Specific Therapeutics
Sojung Bae, Jeong Yoon Lee, Jinjong Myoung
Journal of Microbiology and Biotechnology.2020; 30(12): 1801. CrossRef
Zika Virus-Encoded NS2A and NS4A Strongly Downregulate NF-κB Promoter Activity
Jeong Yoon Lee, Thi Thuy Ngan Nguyen, Jinjong Myoung
Journal of Microbiology and Biotechnology.2020; 30(11): 1651. CrossRef

An ethanol extract of Lysimachia mauritiana exhibits inhibitory activity against hepatitis E virus genotype 3 replication: Seong Eun Jin , Jung-Eun Kim , Sun Yeou Kim , Bang Ju Park , Yoon-Jae Song; J. Microbiol. 2017;55(12):984-988. Published online December 7, 2017; DOI: https://doi.org/10.1007/s12275-017-7477-1

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Abstract

Hepatitis E virus (HEV) is an etiological agent of acute hepatitis E, a self-limiting disease prevalent in developing countries. HEV can cause fulminant hepatic failure with high mortality rates in pregnant women, and genotype 3 is reported to trigger chronic hepatitis in immunocompromised individuals worldwide. Screening of plant extracts for compounds with potential anti-HEV effects led to the identification of a 70% ethanol extract of Lysimachia mauritiana (LME) that interferes with replication of the swine HEV genotype 3 replicon. Furthermore, LME significantly inhibited replication of HEV genotype 3 and expression of HEV ORF2 in infected cells without exerting cytotoxic effects. Collectively, our findings demonstrate the potential utility of LME in the development of novel antiviral drugs against HEV infection.

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Hepatitis E Virus Drug Development
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