Herpes simplex virus infection selectively stimulates accumulation of beta interferon reporter gene mRNA by a posttranscriptional mechanism

Joseph D. Mosca, Paula M. Pitha, Gary Selwyn Hayward

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Abstract

To study the mechanism of a novel herpes simplex virus (HSV) activity that stimulates expression of reporter genes containing beta Interferon (IFN-β)-coding sequences, we have established permanent DNA-transfected cell lines that each contain two distinct hybrid genes encoding mRNA species with different half-lives. These reporter genes comprised either the human IFN-β- or bacterial chloramphenicol acetyltransferase (CAT)-coding and 3′ untranslated regions placed under the transcriptional control of the powerful major immediate-early promoter-enhancer region (IE94) from simian cytomegalovirus. Most of the dual-transfected cell lines yielded significant levels of steady-state IE94-CAT mRNA and abundant constitutive synthesis of CAT enzyme activity, whereas no accumulation of IE94-IFN mRNA could be detected. However, infection with HSV type 1 resulted in a 300-fold increase in IE94-IFN-specific mRNA transcripts, compared with no more than 3- to 5-fold stimulation of IE94-CAT-specific mRNA. In contrast, cycloheximide treatment increased stable mRNA levels and transcription initiation rates from both the IE94-IFN and IE94-CAT hybrid genes. Run-on transcription assays in isolated nuclei suggested that induction of IE94-IFN gene expression by HSV type 1 occurred predominantly at the posttranscriptional level. Enhancement of the unstable IFN mRNA species after HSV infection was also observed in cell lines containing a simian virus 40 enhancer-driven IFN gene (SV2-IFN). Similarly, in transient-transfection assays, both SV2-IFN and IE94-IFN gave only low basal mRNA synthesis, but superinfection with HSV again led to high-level accumulation of IFN mRNA. Finally, substitution of the SV2-IFN gene 3′ region with poly (A) and splicing signals from the SV2-CAT gene cassette led to stabilization of the IFN mRNA even in the absence of HSV. Therefore, we conclude that HSV infection leads to selective accumulation of IFN-β mRNA by a posttranscriptional mechanism that is reporter gene specific and promoter independent.

Original languageEnglish (US)
Pages (from-to)3811-3822
Number of pages12
JournalJournal of Virology
Volume66
Issue number6
Publication statusPublished - Jun 1992
Externally publishedYes

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ASJC Scopus subject areas

  • Immunology

Cite this

Herpes simplex virus infection selectively stimulates accumulation of beta interferon reporter gene mRNA by a posttranscriptional mechanism. / Mosca, Joseph D.; Pitha, Paula M.; Hayward, Gary Selwyn.

In: Journal of Virology, Vol. 66, No. 6, 06.1992, p. 3811-3822.

Research output: Contribution to journalArticle