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Journal of Virology, July 2001, p. 6143-6153, Vol. 75, No. 13
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.13.6143-6153.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

ICP0, ICP4, or VP16 Expressed from Adenovirus Vectors Induces Reactivation of Latent Herpes Simplex Virus Type 1 in Primary Cultures of Latently Infected Trigeminal Ganglion Cells

William P. Halford,dagger Clinton D. Kemp,Dagger Jennifer A. Isler, David J. Davido,§ and Priscilla A. Schaffer*

Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104

Received 19 January 2001/Accepted 27 March 2001

In a previous study, we demonstrated that infected-cell polypeptide 0 (ICP0) is necessary for the efficient reactivation of herpes simplex virus type 1 (HSV-1) in primary cultures of latently infected trigeminal ganglion (TG) cells (W. P. Halford and P. A. Schaffer, J. Virol. 75:3240-3249, 2001). The present study was undertaken to determine whether ICP0 is sufficient to trigger HSV-1 reactivation in latently infected TG cells. To test this hypothesis, replication-defective adenovirus vectors that express wild-type and mutant forms of ICP0 under the control of a tetracycline response element (TRE) promoter were constructed. Similar adenovirus vectors encoding wild-type ICP4, wild-type and mutant forms of the HSV-1 origin-binding protein (OBP), and wild-type and mutant forms of VP16 were also constructed. The TRE promoter was induced by coinfection of Vero cells with the test vector and an adenovirus vector that expresses the reverse tetracycline-regulated transactivator in the presence of doxycycline. Northern blot analysis demonstrated that transcription of the OBP gene in the adenovirus expression vector increased as a function of doxycycline concentration over a range of 0.1 to 10 µM. Likewise, Western blot analysis demonstrated that addition of 3 µM doxycycline to adenovirus vector-infected Vero cells resulted in a 100-fold increase in OBP expression. Wild-type forms of ICP0, ICP4, OBP, and VP16 expressed from adenovirus vectors were functional based on their ability to complement plaque formation in Vero cells by replication-defective HSV-1 strains with mutations in these genes. Adenovirus vectors that express wild-type forms of ICP0, ICP4, or VP16 induced reactivation of HSV-1 in 86% ± 5%, 86% ± 5%, and 97% ± 5% of TG cell cultures, respectively (means ± standard deviations). In contrast, vectors that express wild-type OBP or mutant forms of ICP0, OBP, or VP16 induced reactivation in 5% ± 5%, 8% ± 0%, 0% ± 0%, and 13% ± 6% of TG cell cultures, respectively. In control infections, an adenovirus vector expressed green fluorescent protein efficiently in TG neurons but did not induce HSV-1 reactivation. Therefore, expression of ICP0, ICP4, or VP16 is sufficient to induce HSV-1 reactivation in latently infected TG cell cultures. We conclude that this system provides a powerful tool for determining which cellular and viral proteins are sufficient to induce HSV-1 reactivation from neuronal latency.

* Corresponding author. Present address: Department of Medicine, Harvard Medical School at Beth Israel Deaconess Medical Center, 330 Brookline Ave., RN125, Boston, MA 02215. Phone: (617) 667-2958. Fax: (617) 667-8540. E-mail: pschaffe{at}caregroup.harvard.edu.

dagger Present address: Department of Microbiology and Immunology, Tulane University Medical School, New Orleans, LA 70112.

Dagger Present address: Department of Molecular Biology, Princeton University, Princeton, NJ 08544.

§ Present address: Department of Medicine, Harvard Medical School at Beth Israel Deaconess Medical Center, Boston, MA 02215.

Journal of Virology, July 2001, p. 6143-6153, Vol. 75, No. 13
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.13.6143-6153.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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