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. 1987 May;61(5):1524–1531. doi: 10.1128/jvi.61.5.1524-1531.1987

Expression of interferon-inducible genes in RD-114 cells.

J Kusari, R K Tiwari, R Kumar, G C Sen
PMCID: PMC254131  PMID: 3106649

Abstract

RD-114 is a cell line which is partially responsive to interferon (IFN). Although both IFN-alpha and IFN gamma inhibit production of the resident retrovirus, they do not inhibit replication of other viruses, such as vesicular stomatitis virus and encephalomyocarditis virus, in these cells. In the studies reported here, we studied the characteristics of induction of seven IFN-inducible mRNAs in RD-114 cells. We observed that mRNAs 561, 6-16, 1-8, 2A, and 6-26 have similar induction characteristics in RD-114 cells and in HeLa cells, a fully responsive line. mRNA 2'-5'-oligo-adenylate synthetase (2-5(A) synthetase), however, was induced more efficiently by IFN-alpha in HeLa cells than in RD-114 cells. The same was true for the induction of metallothionein II mRNA by IFN-gamma. However, the latter mRNA was induced equally strongly in both lines when ZnCl2 was used as the inducer, suggesting that the gene is not defective in RD-114 cells. Although IFN-alpha induced 2-5(A) synthetase mRNA poorly and IFN-gamma did not induce it at all in these cells, a mixture of IFN-alpha and IFN-gamma induced this mRNA quite effectively, to a level of induction comparable to that in HeLa cells. Only 1 U of IFN-gamma per ml was sufficient to elicit this synergism, and the data suggested that an IFN-gamma-inducible protein was needed for this process. Induction of mRNA 561 by IFN-alpha in RD-114 cells, unlike that in HeLa cells, did not need ongoing protein synthesis. Once induced, this mRNA turned over rapidly in both cell lines, and this turnover could be slowed down by inhibiting protein synthesis in either cell line. IFN-induced mRNAs, such as 561 and 1-8, were polysome associated in IFN-treated RD-114 cells, suggesting that they were actively translated. Therefore, it is unlikely that the products of these IFN-inducible genes, by themselves, mediate the inhibition of replication of those viruses which are insensitive to IFN action in RD-114 cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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