tetano
Editor, Senior Moderator
Published ahead of print 6 March 2013, doi: 10.1128/JVI.02969-12
Reassortment of NS-segments modifies highly-pathogenic avian influenza virus interaction with avian hosts and host cells
Henning Petersen1,
Zhongfang Wang2,
Eva Lenz2,
Stephan Pleschka2 and
Silke Rautenschlein1,#
+ Author Affiliations
1Clinic for Poultry, University of Veterinary Medicine Hannover, B?nteweg 17, D-30559 Hannover, Germany
2Institute for Medical Virology, Justus-Liebig-University Giessen, Frankfurter Str. 107, D-35392 Giessen, Germany
ABSTRACT
Highly pathogenic avian influenza viruses (HPAIV) of subtypes H5 and H7 have caused numerous outbreaks in diverse poultry species and rising numbers of human infections. Both HPAIV subtypes support a growing concern of a pandemic outbreak specifically via the avian-human link. Natural reassortment of both HPAIV subtypes is a possible event with unpredictable outcome for virulence and host specificity of the progeny virus for avian and mammalian species. NS-reassortment of H5N1 HPAIV viruses in the background of A/FPV/Rostock/1934 (H7N1) HPAIV has been shown to change virus replication kinetics and host cell response in mammalian cells. However, not much is known about virus-host interaction of such viruses in avian species. In the present study, we show that the NS-segment of A/Vietnam/1203/2004 (FPV NS VN, H5N1) HPAIV significantly altered the characteristics of the H7-prototype HPAIV in tracheal organ cultures (TOC) of chicken and turkey in vitro, with decreased replication efficiency accompanied by increased induction of type I interferon (IFN) and apoptosis. Furthermore, species-specific differences between chicken and turkey were demonstrated. Interestingly, NS-reassortant FPV NS VN showed an overall highly-pathogenic phenotype with increased virulence and replication potential compared to the wild-type virus after systemic infection of chicken and turkey embryos. Our data demonstrate that single reassortment of an H5-type NS into an H7-type HPAIV significantly changed virus replication abilities and influenced the avian host cell response without prior adaptation.
http://jvi.asm.org/content/early/2013/02/28/JVI.02969-12.abstract
Reassortment of NS-segments modifies highly-pathogenic avian influenza virus interaction with avian hosts and host cells
Henning Petersen1,
Zhongfang Wang2,
Eva Lenz2,
Stephan Pleschka2 and
Silke Rautenschlein1,#
+ Author Affiliations
1Clinic for Poultry, University of Veterinary Medicine Hannover, B?nteweg 17, D-30559 Hannover, Germany
2Institute for Medical Virology, Justus-Liebig-University Giessen, Frankfurter Str. 107, D-35392 Giessen, Germany
ABSTRACT
Highly pathogenic avian influenza viruses (HPAIV) of subtypes H5 and H7 have caused numerous outbreaks in diverse poultry species and rising numbers of human infections. Both HPAIV subtypes support a growing concern of a pandemic outbreak specifically via the avian-human link. Natural reassortment of both HPAIV subtypes is a possible event with unpredictable outcome for virulence and host specificity of the progeny virus for avian and mammalian species. NS-reassortment of H5N1 HPAIV viruses in the background of A/FPV/Rostock/1934 (H7N1) HPAIV has been shown to change virus replication kinetics and host cell response in mammalian cells. However, not much is known about virus-host interaction of such viruses in avian species. In the present study, we show that the NS-segment of A/Vietnam/1203/2004 (FPV NS VN, H5N1) HPAIV significantly altered the characteristics of the H7-prototype HPAIV in tracheal organ cultures (TOC) of chicken and turkey in vitro, with decreased replication efficiency accompanied by increased induction of type I interferon (IFN) and apoptosis. Furthermore, species-specific differences between chicken and turkey were demonstrated. Interestingly, NS-reassortant FPV NS VN showed an overall highly-pathogenic phenotype with increased virulence and replication potential compared to the wild-type virus after systemic infection of chicken and turkey embryos. Our data demonstrate that single reassortment of an H5-type NS into an H7-type HPAIV significantly changed virus replication abilities and influenced the avian host cell response without prior adaptation.
http://jvi.asm.org/content/early/2013/02/28/JVI.02969-12.abstract