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Journal of Virology, April 2000, p. 3781-3792, Vol. 74, No. 8
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The IRF-3 Transcription Factor Mediates Sendai Virus-Induced Apoptosis

Christophe Heylbroeck,1,2 Siddharth Balachandran,3 Marc J. Servant,1,4 Carmela DeLuca,1,4 Glen N. Barber,3 Rongtuan Lin,1,2,3 and John Hiscott1,2,3,*

Terry Fox Molecular Oncology Group, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital,1 and Departments of Microbiology and Immunology2 and Medicine,4 McGill University, Montreal, Quebec, Canada H3T 1E2, and Sylvester Comprehensive Cancer Center, Department of Microbiology and Immunology, University of Miami, Miami, Florida 331363

Received 8 October 1999/Accepted 21 January 2000

Virus infection of target cells can result in different biological outcomes: lytic infection, cellular transformation, or cell death by apoptosis. Cells respond to virus infection by the activation of specific transcription factors involved in cytokine gene regulation and cell growth control. The ubiquitously expressed interferon regulatory factor 3 (IRF-3) transcription factor is directly activated following virus infection through posttranslational modification. Phosphorylation of specific C-terminal serine residues results in IRF-3 dimerization, nuclear translocation, and activation of DNA-binding and transactivation potential. Once activated, IRF-3 transcriptionally up regulates alpha/beta interferon genes, the chemokine RANTES, and potentially other genes that inhibit viral infection. We previously generated constitutively active [IRF-3(5D)] and dominant negative (IRF-3 Delta N) forms of IRF-3 that control target gene expression. In an effort to characterize the growth regulatory properties of IRF-3, we observed that IRF-3 is a mediator of paramyxovirus-induced apoptosis. Expression of the constitutively active form of IRF-3 is toxic, preventing the establishment of stably transfected cells. By using a tetracycline-inducible system, we show that induction of IRF-3(5D) alone is sufficient to induce apoptosis in human embryonic kidney 293 and human Jurkat T cells as measured by DNA laddering, terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling assay, and analysis of DNA content by flow cytometry. Wild-type IRF-3 expression augments paramyxovirus-induced apoptosis, while expression of IRF-3 Delta N blocks virus-induced apoptosis. In addition, we demonstrate an important role of caspases 8, 9, and 3 in IRF-3-induced apoptosis. These results suggest that IRF-3, in addition to potently activating cytokine genes, regulates apoptotic signalling following virus infection.


* Corresponding author. Mailing address: Lady Davis Institute for Medical Research, 3755 Cote Ste. Catherine, Montreal, Quebec, Canada H3T1E2. Phone: (514) 340-8222, ext. 5265. Fax: (514) 340-7576. E-mail: mijh{at}musica.mcgill.ca.


Journal of Virology, April 2000, p. 3781-3792, Vol. 74, No. 8
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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