title: Suramin inhibits the in vitro expression of encephalitis B virus proteins NS3 and E.
abstract: In this study, the mechanism by which Suramin inhibits the replication of epidemic encephalitis B virus was explored to provide a theoretical basis for its further application in clinical practice. After viral infection of HepG2 and IMR-32 cells, different concentrations of Suramin were added to the culture media, and then the cultural supernatants and infected cells were collected 48 h later. For the evaluation of the curative effect, cytopathic effect (CPE), virus titers, the expression of viral protein and viral RNA were determined by Western blot, RT-PCR and in vitro RNA synthesis, respectively. At the concentration of 50 microg/ml of Suramin, HepG2 and IMR-32 infected with epidemic encephalitis B virus decreased by 51.8% and 0.03% respectively, as compared with controls. It was suggested that expression of encephalitis B virus proteins NS3 and E was notably reduced by Suramin. This is especially true of E protein. At RNA level, however, no difference in RNA virus was found between Suramin-treated virus and non-treated cells. Our results suggest that Suramin can inhibit viral replication by blocking the production of viral proteins.
authors.affiliation: Department of Gastroenterology, Xiehe Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022.
authors.forename: Keshu
authors.initials: K
authors.lastname: Xu
authors.forename: Hongyu
authors.initials: H
authors.lastname: Ren
authors.forename: Jianwen
authors.initials: J
authors.lastname: Zhu
authors.forename: Yun
authors.initials: Y
authors.lastname: Yang
authors.forename: Fang
authors.initials: F
authors.lastname: Liao
mesh_terms: D000998:Antiviral Agents / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000473:pathology / Q000821:virology; D045744:Cell Line, Tumor; D004664:Encephalitis Virus, Japanese; D006801:Humans; D008113:Liver Neoplasms / Q000473:pathology / Q000821:virology; D020365:RNA Helicases; D012367:RNA, Viral / Q000187:drug effects; D012697:Serine Endopeptidases; D013498:Suramin / Q000494:pharmacology*; D014759:Viral Envelope Proteins / Q000096:biosynthesis* / Q000235:genetics; D017361:Viral Nonstructural Proteins / Q000096:biosynthesis* / Q000235:genetics; D014779:Virus Replication / Q000187:drug effects; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases
chemical_list: D000998:Antiviral Agents; D020365:RNA Helicases; D012367:RNA, Viral; D012697:Serine Endopeptidases; D013498:Suramin; D014759:Viral Envelope Proteins; D017361:Viral Nonstructural Proteins; C060028:NS3 protein, flavivirus; D043583:Nucleoside-Triphosphatase; D053487:DEAD-box RNA Helicases; D000085242:Viral Proteases