title: Oseltamivir boosts 2009 H1N1 virus infectivity in vitro.
abstract: The neuraminidase inhibitor oseltamivir has been identified to have significant anti-influenza activity in clinical practice. However, its efficacy has not been verified in enough subtypes of influenza A virus, particularly, the current pandemic virus, H1N1. In vitro, using our influenza pseudotyped particle system, oseltamivir displayed significant inhibitory effects on viral NA activity and pp release. Conversely, a boosting effect on viral infection was observed, particularly with the 2009 H1N1 pp at oseltamivir concentrations above 0.025muM. Further testing on two wild 2009 H1N1 virus strains, A/California/07/09 and A/Sichuan/1/09, as well as a seasonal flu virus, A/Baoan/51/2008, confirmed these findings.
authors.affiliation: State Key Laboratory for Molecular Virology and Genetic Engineering, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Yingxin Street 100, Xuanwu District, Beijing 100052, People's Republic of China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Lin
authors.forename: Jianfang
authors.initials: J
authors.lastname: Zhou
authors.forename: Yonghui
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jia
authors.initials: J
authors.lastname: Wu
authors.forename: Fengwei
authors.initials: F
authors.lastname: Zhang
authors.forename: Zi
authors.initials: Z
authors.lastname: Li
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.forename: Shengli
authors.initials: S
authors.lastname: Bi
authors.forename: Yuelong
authors.initials: Y
authors.lastname: Shu
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000818:Animals; D000998:Antiviral Agents / Q000494:pharmacology* / Q000627:therapeutic use; D002460:Cell Line; D004791:Enzyme Inhibitors / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000187:drug effects* / Q000201:enzymology / Q000502:physiology; D007251:Influenza, Human / Q000188:drug therapy / Q000453:epidemiology / Q000821:virology; D051379:Mice; D009439:Neuraminidase / Q000037:antagonists & inhibitors*; D053139:Oseltamivir / Q000494:pharmacology* / Q000627:therapeutic use; D053586:Virus Internalization / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D004791:Enzyme Inhibitors; D053139:Oseltamivir; D009439:Neuraminidase