@article{mbs:/content/journal/jgv/10.1099/0022-1317-69-8-2085, author = "Fujii, Nobuhiro and Oguma, Keiji and Kimura, Kouichi and Yamashita, Toshiharu and Ishida, Setsuko and Fujinaga, Kei and Yashiki, Teruo", title = "Oligo-2′,5′-adenylate Synthetase Activity in K562 Cell Lines Persistently Infected with Measles or Mumps Virus", journal= "Journal of General Virology", year = "1988", volume = "69", number = "8", pages = "2085-2091", doi = "https://doi.org/10.1099/0022-1317-69-8-2085", url = "https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-69-8-2085", publisher = "Microbiology Society", issn = "1465-2099", type = "Journal Article", keywords = "interferon (HuIFN)", keywords = "mumps virus", keywords = "measles virus", keywords = "oligo-2′,5′-adenylate synthetase", abstract = "Summary Fluctuation of oligo-2′,5′-adenylate synthetase (2-5AS) activity was examined in K562 cells infected with vaccine strains of measles virus (strains AIK-C and CAM-70) and mumps virus (strains Torii and Miyahara). Persistent infection was easily established in the mumps virus-infected cells without significant cytolysis or cell killing. In contrast, most of the cells infected with measles virus were killed by extensive cytolysis within 3 to 4 days. The small number of cells that did survive became persistently infected. That these persistently infected cells carried a virus antigen was confirmed by fluorescein isothiocyanate-labelled anti-measles virus rabbit antiserum and anti-mumps virus rabbit antiserum. The cells produced infectious progeny virus as well as interferon (IFN). Little induction of 2-5AS activity by IFN was demonstrated during the early stages of infection by these viruses. Similar results were observed in some of the persistently infected cells but not, however, K-CMP cells (K562 cells persistently infected with CAM-70) or K-MMP cells (K562 cells persistently infected with Miyahara). Failure to induce 2-5AS activity was unchanged in cells cultured for more than 6 months. The decrease of 2-5AS activity observed in K-MTP cells (K562 cells persistently infected with Torii) was the result of suppression of transcription of 2-5AS mRNA. On the other hand, a normal level of mRNA was found in K-AKP cells (K562 cells persistently infected with AIK-C). Therefore, it is suggested that the decrease of 2-5AS activity in K-AKP cells may be due to a failure to translate 2-5AS mRNA.", }