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J. Biol. Chem., Vol. 279, Issue 27, 28706-28714, July 2, 2004
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From the Ottawa Health Research Institute, Neuroscience Centre and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario K1H 8M5, Canada
The p53 tumor suppressor gene is believed to play an important role in neuronal cell death in acute neurological disease and in neurodegeneration. The p53 signaling cascade is complex, and the mechanism by which p53 induces apoptosis is cell type-dependent. Using DNA microarray analysis, we have found a striking induction of the proapoptotic gene, SIVA. SIVA is a proapoptotic protein containing a death domain and interacts with members of the tumor necrosis factor receptor family as well as anti-apoptotic Bcl-2 family proteins. SIVA is induced following direct p53 gene delivery, treatment with a DNA-damaging agent camptothecin, and stroke injury in vivo. SIVA up-regulation is sufficient to initiate the apoptotic cascade in neurons. Through isolation and analysis of the SIVA promoter, we have identified response elements for both p53 and E2F1. Like p53, E2F1 is another tumor suppressor gene involved in the regulation of apoptosis, including neuronal injury models. We have identified E2F consensus sites in the promoter region, whereas p53 recognition sequences were found in intron1. Sequence analysis has shown that these consensus sites are also conserved between mouse and human SIVA genes. Electrophoretic mobility shift assays reveal that both transcription factors are capable of binding to putative consensus sites, and luciferase reporter assays reveal that E2F1 and p53 can activate transcription from the SIVA promoter. Here, we report that the proapoptotic gene, SIVA, which functions in a broad spectrum of cell types, is a direct transcriptional target for both tumor suppressors, p53 and E2F1.
Received for publication, January 13, 2004 , and in revised form, April 1, 2004.
* This work was supported in part by grants from the Canadian Institutes of Health Research (CIHR) and Heart and Stroke Foundation of Ontario (to R. S. S.). Adenoviral vectors were generated by the Viral Vector Core Facility supported by grants from the Canadian Stroke Network (to R. S. S. and D. S. P.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
Supported by the Canadian Stroke Network.
Supported by an Ontario Neurotrauma studentship.
¶ Supported by a CIHR postdoctoral fellowship. Current address: Robarts Research Institute, Cell Biology Group, P. O. Box 5015, 100 Perth Dr., London, Ontario N6A 5K8, Canada.
|| Supported by a CIHR studentship.
** A CIHR/Novartis Chair in Neuroscience.

To whom correspondence should be addressed: Ottawa Health Research Institute, University of Ottawa, 451 Smyth Rd., Ottawa, Ontario K1H 8M5, Canada. Tel.: 613-562-5800 (ext. 8459); Fax: 613-562-5403; E-mail: rslack{at}uottawa.ca.
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