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Journal of Virology, August 2004, p. 8068-8077, Vol. 78, No. 15
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.15.8068-8077.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Herpes Simplex Virus Type 1 Infection Induces the Stabilization of p53 in a USP7- and ATM-Independent Manner

Chris Boutell and Roger D. Everett*

Medical Research Council Virology Unit, Glasgow G11 5JR, Scotland, United Kingdom

Received 6 January 2004/ Accepted 23 March 2004

The major oncoprotein p53 regulates several cellular antiproliferation pathways that can be triggered in response to a variety of cellular stresses, including viral infection. The stabilization of p53 is a key factor in the ability of cells to initiate an efficient transcriptional response after cellular stress. Here we present data demonstrating that herpes simplex virus type 1 (HSV-1) infection of HFFF-2 cells, a low-passage-number nontransformed human primary cell line, results in the stabilization of p53. This process required viral immediate-early gene expression but occurred independently of the viral regulatory protein ICP0 and viral DNA replication. No specific viral protein could be identified as being solely responsible for the effect, which appears to be a cellular response to developing HSV-1 infections. HSV-1 infection also induced the phosphorylation of p53 at residues Ser15 and Ser20, which have previously been implicated in its stabilization in response to DNA damage. However, an HSV-1 infection of ATM–/– cells, which lack a kinase implicated in these phosphorylation events, did not lead to the phosphorylation of p53 at these residues, but nonetheless p53 was stabilized. We also show that the wild-type p53 expressed by osteosarcoma U2OS cells can be stabilized in response to DNA damage induced by UV irradiation, but not in response to HSV-1 infection. These data suggest that multiple cellular mechanisms are initiated to stabilize p53 during an HSV-1 infection. These mechanisms occur independently of ICP0 and its ability to sequester USP7 and may differ from those initiated in response to DNA damage.

* Corresponding author. Mailing address: MRC Virology Unit, Church St., Glasgow G11 5JR, Scotland, United Kingdom. Phone: 44 141-330-3923. Fax: 44 141-337-2236. E-mail: r.everett{at}vir.gla.ac.uk.

Journal of Virology, August 2004, p. 8068-8077, Vol. 78, No. 15
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.15.8068-8077.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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