Abstract
Changes in interferon (IFN)-stimulated gene (ISG) expression in cells infected with measles virus (MeV), four wild strains (belonging to different genotypes), and the laboratory strain Edmonston were examined. ISGs [MxA, 2'-5'-oligoadenylate synthetase, and interferon regulatory factor-1] were upregulated in an MeV-infection-induced manner and in an IFN-induced manner. In MeV-infected SiHa cell lines, the MeV infection-induced expression levels were in the order of A>H1>D8>D5>D3. On the other hand, all infected cell lines abolished type I and III IFN-induced ISG expression. However, partial type II IFN-mediated induction was observed in the MeV-infected cells. The wild strain of genotype D3 was the most potent inhibitor of MeV infection-induced and IFN-induced ISG expression and generated the highest titer of infectious viral particles. Edmonston triggered the highest levels of MeV infection-induced ISG expression in SiHa cells and produced the lowest titer of infectious particles. Expression of the viral C protein was associated with suppression of MeV infection-induced and type II IFN-induced ISG expression.
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