Summary
The effects of double-stranded RNA (dsRNA) on interferon (IFN)-induced antiviral and anticellular activities was investigated by introducing poly(I)-poly(C) into mouse L-cells. Coprecipitation of dsRNA with calcium phosphate enabled its efficient penetration into cells in culture. Rate of cellular protein synthesis was inhibited by dsRNA only in cultures pretreated with IFN. Moreover, the anticellular effect of IFN, as measured by the inhibition of cell DNA synthesis, was also enhanced by dsRNA. The kinetics of dsRNA-mediated inhibition of protein synthesis were relatively slow as compared with the inhibitory effect of 2′-5′oligoadenylic acid (2′5′A), which was also introduced into cells by the calcium phosphate coprecipitation technique.
To analyze the effects of dsRNA on the antiviral state induced by IFN, vesicular stomatitis virus (VSV) and encephalomyocarditis virus (EMC), replications were followed by measuring viral-specific RNA synthesis in the cell. Introduction of dsRNA after the infection had no effect on VSV and EMC replication in control cells, and it enhanced, to a small extent, the antiviral state of cells pretreated with IFN. In contrast, introduction of 2′5′A into virus-infected cells inhibited VSV and EMC replications regardless of IFN pretreatment.
This work demonstrated that the role of dsRNA in regulating the antiviral and anticellular activities of IFN could be studied by introducing exogenous dsRNA into cells in culture by the calcium phosphate coprecipitation technique.
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Abbreviations
- 2′5′A:
-
triphosphoadenyl (2′5′) adenylyl (2′-5′) adenosine
- Pi:
-
the interferon-induced 67 000 dalton protein
- RNase F:
-
the 2′5′A-dependent ribonuclease
- Hepes:
-
4-(2-hydroxy)-1-piperazineethane sulfonic acid
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Panet, A. Regulation of the antiviral and anticellular activities of interferon by exogenous double-stranded RNA. Mol Cell Biochem 52, 153–160 (1983). https://doi.org/10.1007/BF00224924
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DOI: https://doi.org/10.1007/BF00224924