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Journal of Virology, May 2005, p. 5713-5720, Vol. 79, No. 9
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.9.5713-5720.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

T-Cell Growth Transformation by Herpesvirus Saimiri Is Independent of STAT3 Activation

Elke Heck, Doris Lengenfelder, Monika Schmidt, Ingrid Müller-Fleckenstein, Bernhard Fleckenstein, Brigitte Biesinger, and Armin Ensser*

Institut für Klinische und Molekulare Virologie, Friedrich-Alexander Universität Erlangen-Nürnberg, D-91054 Erlangen, Germany

Received 11 October 2004/ Accepted 16 December 2004

Herpesvirus saimiri (saimirine herpesvirus 2) (HVS), a T-lymphotropic tumor virus, induces lymphoproliferative disease in several species of New World primates. In addition, strains of HVS subgroup C are able to transform T cells of Old World primates, including humans, to permanently growing T-cell lines. In concert with the Stp oncoprotein, the tyrosine kinase-interacting protein (Tip) of HVS C488 is required for T-cell transformation in vitro and lymphoma induction in vivo. Tip was previously shown to interact with the protein tyrosine kinase Lck. Constitutive activation of signal transducers and activators of transcription (STATs) has been associated with oncogenesis and has also been detected in HVS-transformed T-cell lines. Furthermore, Tip contains a putative consensus YXPQ binding motif for the SH2 (src homology 2) domains of STAT1 and STAT3. Tip tyrosine phosphorylation at this site was required for binding of STATs and induction of STAT-dependent transcription. Here we sought to address the relevance of STAT activation for transformation of human T cells by introducing a tyrosine-to-phenylalanine mutation in the YXPQ motif of Tip of HVS C488. Unexpectedly, the recombinant virus was still able to transform human T lymphocytes, but it had lost its capability to activate STAT3 as well as STAT1. This demonstrates that growth transformation by HVS is independent of STAT3 activation.

* Corresponding author. Mailing address: Institut für Klinische und Molekulare Virologie, Friedrich-Alexander Universität Erlangen-Nürnberg, Schlossgarten 4, D-91054 Erlangen, Germany. Phone: 49-9131-852-2104. Fax: 49-9131-852-6493. E-mail: ensser{at}viro.med.uni-erlangen.de.

Journal of Virology, May 2005, p. 5713-5720, Vol. 79, No. 9
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.9.5713-5720.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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