title: Inhibition of hepatitis B virus by D-fraction from Grifola frondosa: synergistic effect of combination with interferon-alpha in HepG2 2.2.15.
abstract: In this study, D-fraction extracted from Grifola frondosa (GF-D) and its combination with human interferon alpha-2b (IFN) were investigated for the inhibitory effect on hepatitis B virus (HBV) in HepG2 2.2.15 cells (2.2.15 cells). HBV DNA and viral antigens were analyzed by a quantitative real-time polymerase chain reaction and end-point titration in radioimmunoassays, respectively. The results showed that GF-D or IFN alone could inhibit HBV DNA in 2.2.15 cells with the 50% inhibitory concentration (IC50) of 0.59 mg/ml and 1399 IU/ml, respectively. We further investigated the combination of GF-D and IFN for anti-HBV activity and found that they synergistically inhibited HBV replication in 2.2.15 cells. In combination with 0.45 mg/ml GF-D, the apparent IC50 value for IFN was 154 IU/ml. This 9-fold increase in antiviral activity of IFN suggested that GF-D could synergize with IFN. These results indicate that GF-D, in combination with IFN, might provide a potentially effective therapy against chronic HBV infections.
authors.affiliation: Institute of Health and Environmental Medicine, Tianjin 300050, PR China. changqinggu@sina.com
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Gu
authors.forename: JunWen
authors.initials: J
authors.lastname: Li
authors.forename: Jun-Wen
authors.initials: JW
authors.lastname: Li
authors.forename: Fu-Huan
authors.initials: FH
authors.lastname: Chao
mesh_terms: D000998:Antiviral Agents / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D004279:DNA, Viral / Q000032:analysis; D004357:Drug Synergism; D048691:Grifola / Q000737:chemistry*; D006511:Hepatitis B Antigens / Q000032:analysis; D006515:Hepatitis B virus / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000494:pharmacology*; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006511:Hepatitis B Antigens; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins