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Journal of Virology, April 2001, p. 3444-3452, Vol. 75, No. 7
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.7.3444-3452.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Inhibition of Histone Deacetylation Induces Constitutive Derepression of the Beta Interferon Promoter and Confers Antiviral Activity

Elena Shestakova, Marie-Thérèse Bandu, Janine Doly, and Eliette Bonnefoy*

Laboratoire de Régulation de la Transcription et Maladies Génétiques, CNRS, UPR2228, UFR Biomédicale, Université René Descartes, 75270 Paris Cedex 06, France

Received 1 November 2000/Accepted 3 January 2001

The induction of alpha/beta interferon (IFN-alpha /beta ) genes constitutes one of the first responses of the cell to virus infection. The IFN-beta gene is constitutively repressed in uninfected cells and is transiently activated after virus infection. In this work we demonstrate that histone deacetylation regulates the silent state of the murine IFN-beta gene. Using chromatin immunoprecipitation (ChIP) assays, we show a direct in vivo correlation between the transcriptionally silent state and a state of hypoacetylation of histone H4 on the IFN-beta promoter region. Trichostatin A (TSA), a specific inhibitor of histone deacetylases, induced strong, constitutive derepression of the murine IFN-beta promoter stably integrated into a chromatin context, as well as the hyperacetylation of histone H4, without requiring de novo protein synthesis. We also show in this work that TSA treatment strongly enhances the endogenous IFN level and confers an antiviral state to murine fibroblastic L929 cells. Inhibition of histone deacetylation with TSA protected the cells against the lost of viability induced by vesicular stomatitis virus (VSV) and inhibited VSV multiplication. Using antibodies neutralizing IFN-alpha /beta , we show that the antiviral state induced by TSA is due to TSA-induced IFN production. The demonstration of the predominant role of histone deacetylation during the regulation of the constitutive repressed state of the IFN-beta promoter constitutes an interesting advance on the understanding of the negative regulation of this gene and opens up the possibility of new therapeutic perspectives.

* Corresponding author. Mailing address: Laboratoire de Régulation de la Transcription et Maladies Génétiques, CNRS, UPR2228, UFR Biomédicale, Université René Descartes, 45 rue des Saints-Pères, 75270 Paris Cedex 06, France. Phone: (33) 01.42.86.22.76. Fax: (33) 01.42.86.20.42. E-mail: bonnefoy{at}biomedicale.univ-paris5.fr.

Journal of Virology, April 2001, p. 3444-3452, Vol. 75, No. 7
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.7.3444-3452.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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