JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
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Impacts of different expressions of PA-X protein on 2009 pandemic H1N1 virus replication, pathogenicity and host immune responses.

Virology 2017 April
Although several studies have investigated the functions of influenza PA-X, the impact of different expressions of PA-X protein including full-length, truncated or PA-X deficient forms on virus replication, pathogenicity and host response remains unclear. Herein, we generated two mutated viruses expressing a full-length or deficient PA-X protein based on the A/California/04/2009 (H1N1) virus that expresses a truncated PA-X to understand three different expressions of PA-X protein on virus replication, pathogenicity and host immune responses. The results showed that expression of either full-length or truncated PA-X protein enhanced viral replication and pathogenicity as well as reduced host innate immune response in mice by host shutoff activity when compared to the virus expressing the deficient PA-X form. Furthermore, the full-length PA-X expression exhibited a greater effect on virus pathogenicity than the truncated PA-X form. Our results provide novel insights of PA-X on viral replication, pathogenicity and host immune responses.

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