Schlafen (SLFN) proteins have been suggested to play important functions in cell proliferation and immune cell development. In this study, we determined the antiviral activities of putative RNA-helicase domain-containing SLFN14. Murine SLFN14 expression was specifically induced by TLR3-mediated pathways and type I interferon (IFN) in RAW264.7 mouse macrophages. To examine the role of SLFN during viral infection, cells were infected with either wild-type PR8 or delNS1/PR8 virus. SLFN14 expression was specifically induced following influenza virus infection. Overexpression of SLFN14 in A549 cells reduced viral replication, whereas knockdown of SLFN14 in RAW264.7 cells enhanced viral titers. Furthermore, SLFN14 promoted the delay in viral NP translocation from cytoplasm to nucleus and enhanced RIG-I-mediated IFN-β signaling. In addition, SLFN14 overexpression promoted antiviral activity against varicella zoster virus (VZV), a DNA virus. In conclusion, our data suggest that SLFN14 is a novel antiviral factor for both DNA and RNA viruses.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) , funded by the Ministry of Science, ICT & Future Planning ( NRF-2016R1C1B2006493 ) and a grant ( 1R21NS099838-01 ) from National Institute of Neurological Disorders and Stroke , grant ( P30GM114737 ) from the Centers of Biomedical Research Excellence, National Institute of General Medical Sciences, National Institutes of Health.
© 2017 Elsevier GmbH
ASJC Scopus subject areas
- Immunology and Allergy