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Sendai virus (SeV), a murine paramyxovirus, has been used to study the induction of type I interferon (IFN) subtypes in robust quantities. Few studies have measured whether the IFN that SeV induces actually fulfills its intended purpose of interfering with virus-mediated effects in the cells in which it is produced. We determined the effects of IFN on SeV-mediated cytopathic effects (CPE) and the ability of IFN to protect against virus infection. SeV-induced biologically active IFN resulted in Jak/STAT activation and the production of a number of interferon-stimulated genes (ISGs). However, these responses did not inhibit SeV replication or CPE. This observation was not due to SeV effects on canonical IFN signaling. Furthermore, pretreating cells with type I IFN and establishing an antiviral state before infection did not mediate SeV effects. Therefore, the induction of canonical IFN signaling pathways and ISGs does not always confer protection against the IFN-inducing virus. Because type I IFNs are approved to treat various infections, our findings suggest that typical markers of IFN activity may not be indicative of a protective antiviral response and should not be used alone to determine whether an antiviral state against a particular virus is achieved.

Type I Interferon-Mediated Induction of Antiviral Genes and Proteins Fails to Protect Cells from the Cytopathic Effects of Sendai Virus Infection