Super-infection with Staphylococcus aureus inhibits influenza virus-induced type I IFN signalling through impaired
Kathrin Warnking1, Carolin Klemm, Bettina Löffler
1Institute of Molecular Virology (IMV), Center for Molecular Biology of Inflammation (ZMBE), Westfaelische Wilhelms-University Muenster, Von Esmarch-Str. 56, D-48149, Muenster, Germany.
Abstract:
Bacterial super-infections are a major complication in influenza virus-infected patients. In response to infection with influenza viruses and bacteria, a complex interplay of cellular signalling mechanisms is initiated, regulating the anti-pathogen response but also pathogen-supportive functions. Here, we show that influenza viruses replicate to a higher efficiency in cells co-infected with Staphylococcus aureus (S. aureus). While cells initially respond with increased induction of interferon beta upon super-infection, subsequent interferon signalling and interferon-stimulated gene expression are rather impaired due to a block of STAT1-STAT2 dimerization. Thus, S. aureus interrupts the first line of defence against influenza viruses, resulting in a boost of viral replication, which may lead to enhanced viral pathogenicity.
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