Summary
DRB is an inhibitor of heterogeneous nuclear RNA (hnRNA) and messenger RNA (mRNA) synthesis. The effect of DRB on interferon production stimulated by Newcastle disease virus (NDV) in the human FS-4 cells was studied. Interferon production in cells primed by treatment with interferon was markedly enhanced (superinduced) in the presence of DRB. This superinduction was essentially due to an inhibition of the rapid decline (shutoff) of interferon production observed in primed cells not treated with DRB. Continuous presence of DRB was required for maximal superinduction. In this and other respects the interferon response induced by NDV in primed cells resembled poly(I) · poly(C)-induced interferon production. In contrast interferon production in cells not primed with interferon was virtually abolished by DRB treatment. Since neither virus specific RNA synthesis nor virus replication were significantly affected by DRB, the inhibition of interferon production is likely to result from the inhibitory action of DRB on a cellular, rather than viral, function. Apparently some differences exist in the synthesis or processing of the mRNAs for interferons in primed and unprimed cells and these determine the different sensitivities of these two responses to DRB.
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Kohase, M., Vilček, J. Interferon induction with Newcastle disease virus in FS-4 cells: Effect of 5,6-dichloro-1-β-D-ribofuranosylbenzimidazole (DRB). Archives of Virology 62, 263–271 (1979). https://doi.org/10.1007/BF01317558
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DOI: https://doi.org/10.1007/BF01317558