Identification of an Oligostilbene, Vaticanol B, from Dryobalanops aromatica Leaves as an Antiviral Compound against the Hepatitis C Virus

Chie Aoki-Utsubo, Muhammad Hanafi, Destia Tri Armanti, Hiroyuki Fuchino, Nobuo Kawahara, Sri Hartati, Aty Widyawaruyanti, Pratiwi Sudarmono, Masanori Kameoka, Hak Hotta

Research output: Contribution to journalArticlepeer-review


Chronic hepatitis C virus (HCV) infection can lead to liver cirrhosis and hepatocellular carcinoma. Although current medications using direct-acting antivirals (DAAs) are highly effective and well-tolerated for treating patients with chronic HCV, high prices and the existence of DAA-resistant variants hamper treatment. There is thus a need for easily accessible antivirals with different mechanisms of action. During the screening of Indonesian medicinal plants for anti-HCV activity, we found that a crude extract of Dryobalanops aromatica leaves possessed strong antiviral activity against HCV. Bioassay-guided purification identified an oligostilbene, vaticanol B, as an active compound responsible for the anti-HCV activity. Vaticanol B inhibited HCV infection in a dose-dependent manner with 50% effective and cytotoxic concentrations of 3.6 and 559.5 μg/mL, respectively (Selectivity Index: 155.4). A time-of-addition study revealed that the infectivity of HCV virions was largely lost upon vaticanol B pretreatment. Also, the addition of vaticanol B following viral entry slightly but significantly suppressed HCV replication and HCV protein expression in HCVinfected and a subgenomic HCV replicon cells. Thus, the results clearly demonstrated that vaticanol B acted mainly on the viral entry step, while acting weakly on the post-entry step as well. Furthermore, co-treatment of the HCV NS5A inhibitor daclatasvir with vaticanol B increased the anti-HCV effect. Collectively, the present study has identified a plant-derived oligostilbene, vaticanol B, as a novel anti-HCV compound.

Original languageEnglish
Pages (from-to)1079-1087
Number of pages9
JournalBiological and Pharmaceutical Bulletin
Issue number8
Publication statusPublished - Aug 2023


  • antiviral
  • hepatitis C virus
  • inhibition
  • vaticanol B


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