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Journal of Virology, October 2005, p. 12921-12933, Vol. 79, No. 20
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.20.12921-12933.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
T-Cell Tropism and the Role of ORF66 Protein in Pathogenesis of Varicella-Zoster Virus Infection
Anne Schaap,1*
Jean-Francois Fortin,2
Marvin Sommer,1
Leigh Zerboni,1
Shaye Stamatis,1
Chia-Chi Ku,1
Garry P. Nolan,2 and
Ann M. Arvin1,2
Departments of Pediatrics,1
Microbiology and Immunology, Stanford University School of Medicine, 300 Pasteur Dr., Stanford, California 94305-52082
Received 23 February 2005/
Accepted 25 July 2005
The pathogenesis of varicella-zoster virus (VZV) involves a cell-associated viremia during which infectious virus is carried from sites of respiratory mucosal inoculation to the skin. We now demonstrate that VZV infection of T cells is associated with robust virion production and modulation of the apoptosis and interferon pathways within these cells. The VZV serine/threonine protein kinase encoded by ORF66 is essential for the efficient replication of VZV in T cells. Preventing ORF66 protein expression by stop codon insertion (pOka66S) impaired the growth of the parent Oka (pOka) strain in T cells in SCID-hu T-cell xenografts in vivo and reduced formation of VZV virions. The lack of ORF66 protein also increased the susceptibility of infected T cells to apoptosis and reduced the capacity of the virus to interfere with induction of the interferon (IFN) signaling pathway following exposure to IFN-
. However, preventing ORF66 protein expression only slightly reduced growth in melanoma cells in culture and did not diminish virion formation in these cells. The pOka66S virus showed only a slight defect in growth in SCID-hu skin implants compared with intact pOka. These observations suggest that the ORF66 kinase plays a unique role during infection of T cells and supports VZV T-cell tropism by contributing to immune evasion and enhancing survival of infected T cells.
* Corresponding author. Mailing address: G312, Department of Pediatrics, Stanford University School of Medicine, 300 Pasteur Dr., Stanford, CA 94305-5208. Phone: (650) 725-6555. Fax: (650) 725-8040. E-mail:
aschaap{at}stanford.edu.
Journal of Virology, October 2005, p. 12921-12933, Vol. 79, No. 20
0022-538X/05/$08.00+0 doi:10.1128/JVI.79.20.12921-12933.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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