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. 1991 Aug 25;19(16):4387–4393. doi: 10.1093/nar/19.16.4387

Inhibition of the cellular response to interferons by products of the adenovirus type 5 E1A oncogene.

A M Ackrill 1, G R Foster 1, C D Laxton 1, D M Flavell 1, G R Stark 1, I M Kerr 1
PMCID: PMC328624  PMID: 1832217

Abstract

Expression of the E1A oncogene of adenovirus type 5 inhibits the response of interferon (IFN)-inducible constructs to Type I (alpha,beta) and II (gamma) IFNs in transient transfection assays. In human cell lines stably expressing E1A mRNA and protein acquisition of an antiviral state and the induction of a number of genes in response to alpha- and gamma-IFNs is inhibited. A short IFN-stimulable response element (ISRE) present in the 5' flanking region of a number of genes mediates induction by alpha- and gamma-IFNs. In cells expressing E1A there is a substantial reduction in the levels of the ISRE-binding factors E and M, inducible by alpha-IFN, and of factor G, inducible by gamma-IFN. In E1A-expressing cells the E alpha subunit of factor E is activated normally in response to alpha-IFN; the defect is in the production or activation of the E gamma subunit. The inhibitory activity of E1A is lost upon deletion of the CR1 domain. The induction of HLA class II genes by gamma-IFN, which involves a different DNA response element(s), and of beta-IFN mRNA in response to double-stranded RNA are also inhibited by E1A. An essential component(s) of a number of signalling pathways must, therefore, be subject, directly or indirectly, to inhibition by E1A.

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