Altered baby hamster kidney (BHK-R) cells, which were established by serial passage of BHK cells in the presence of Sendai virus (SeV), allowed vesicular stomatitis virus (VSV) to replicate despite treatment with type I interferon (IFN). We have analyzed here mechanisms of the unresponsiveness to IFN. BHK-R cells cultured in the absence of SeV for 10 days under the conditions of no cell division (BHK-R10D) became sensitive to IFN. Studies on induction of unresponsiveness to IFN in BHK-R10D cells revealed that entry of SeV nucleocapsids into a cell was essential. Interestingly, even UV-inactivated SeV but not Newcastle disease virus was found to be able to confer resistance to IFN on HeLa or BHK cells as well as on BHK-R10D cells, suggesting that the IFN-resistance resulted from functions of SeV independent of replication of the viral genome but not from mutations of the cellular genome. Furthermore immunofluorescent experiments demonstrated that UV-inactivated SeV could rescue VSV replication from the antiviral action of IFN without expression of SeV antigens, confirming that the secondary transcription resulting in synthesis of large amounts of viral proteins was dispensable for the IFN-resistance. Thus we have revealed a unique strategy of SeV against the antiviral action of IFN.
Archives of Virology – Springer Journals
Published: Jun 1, 1999
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