Abstract：
:Persistent infections with mumps virus were established in human B-lymphoid cell line Akata and in the human chronic myelogenous leukaemia cell line K562. Even after IFN treatment a drastic decrease in STAT-1alpha (signal transducers and activators of transcription-1alpha), STAT-2 and p48 (ISGF-3gamma: IFN-stimulated gene factor-3gamma), which are closely correlated with the IFN-signaling pathway, was found in these persistently infected cells (Akata-MP1 and K-MTP). Therefore, the IFN-signaling pathway is thought to be defective in these persistently infected cells. In other words, most of the IFN-inducible genes in these cells persistently infected with mumps virus may not be able to respond to IFN treatment. Indeed, poor induction of 2',5'-oligoadenylate synthetase (2-5AS), dsRNA activated protein kinase (PKR), and MxA protein mRNAs were demonstrated in these cell lines after IFN treatment. Expression of MHC class-I antigen was also significantly reduced in the persistently infected cell lines as compared with that of uninfected control cells. HLA antigen was augmented by IFN-alpha in Akata and K562 cells, but not in persistently infected cells. Furthermore, suppression of IFN-induced 2-5AS induction and MHC class-I expression was restored by treatment of persistently infected cells with ribavirin through inhibition of virus replication. The result of restoration was also confirmed by IFN-induced STAT-1 induction in persistently infected cells treated with ribavirin.
journal_name
Virus Resjournal_title
Virus researchauthors
Fujii N,Yokosawa N,Shirakawa Sdoi
10.1016/s0168-1702(99)00114-8subject
Has Abstractpub_date
1999-12-15 00:00:00pages
175-85issue
2eissn
0168-1702issn
1872-7492pii
S0168170299001148journal_volume
65pub_type
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