Activation of the PKR/eIF2α signaling cascade inhibits replication of Newcastle disease virus.

Abstract

BACKGROUND:

Newcastle Disease virus (NDV) causes severe and economically significant disease in almost all birds. However, factors that affect NDV replication in host cells are poorly understood. NDV generates long double-stranded RNA (dsRNA) molecules during transcription of single-stranded genomic RNA. Protein kinase R (PKR) is activated by dsRNA. The aim of this study was to elucidate the role of PKR in NDV infection.

RESULTS:

NDV infection led to the activation of dsRNA-dependent PKR and phosphorylation of its substrate, translation initiation factor eIF2α, in a dose-dependent manner by either the lentogenic strain LaSota or a velogenic strain Herts/33. PKR activation coincided with the accumulation of dsRNA induced by NDV infection. PKR knockdown remarkably decreased eIF2α phosphorylation as well as IFN-β mRNA levels, leading to the augmentation of extracellular virus titer. Furthermore, siRNA knockdown or phosphorylation of eIF2α or okadaic acid treatment significantly impaired NDV replication, indicating the critical role of the PKR/eIF2α signaling cascade in NDV infection.

CONCLUSION:

PKR is activated by dsRNA generated by NDV infection and inhibits NDV replication by eIF2α phosphorylation. This study provides insight into NDV-host interactions for the development of candidate antiviral strategies.

• Authors: Shilei Zhang, Yingjie Sun, Hongjun Chen, Yabin Dai, Yuan Zhan, Shengqing Yu, Xusheng Qiu, Lei Tan, Cuiping Song, Chan Ding
• Journal: Virology journal (Virol J) Vol. 11 Pg. 62 (Mar 31 2014) ISSN: 1743-422X [Electronic] England
• PMID: 24684861 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Eukaryotic Initiation Factor-2
• RNA, Double-Stranded
• RNA, Viral
• eIF-2 Kinase

Topics

• Animals
• Birds
• Cell Line
• Eukaryotic Initiation Factor-2 (metabolism)
• Humans
• Newcastle disease virus (immunology, physiology)
• RNA, Double-Stranded (immunology)
• RNA, Viral (immunology)
• Signal Transduction
• Virus Replication
• eIF-2 Kinase (metabolism)