Oligo-2',5'-adenylate synthetase activity in K562 cell lines persistently infected with measles or mumps virus.
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.
Fujii
N
N
Department of Microbiology, Sapporo, Medical College, Japan.
Oguma
K
K
Kimura
K
K
Yamashita
T
T
Ishida
S
S
Fujinaga
K
K
Yashiki
T
T
D015088:2',5'-Oligoadenylate Synthetase / Q000096:biosynthesis* / Q000235:genetics; D002460:Cell Line; D004790:Enzyme Induction; D007372:Interferons / Q000096:biosynthesis / Q000276:immunology; D008459:Measles virus / Q000502:physiology*; D009109:Mumps virus / Q000502:physiology*; D012333:RNA, Messenger / Q000032:analysis
D012333:RNA, Messenger; D007372:Interferons; D015088:2',5'-Oligoadenylate Synthetase