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J Virol, May 1998, p. 3698-3704, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Substitution of ras for the Herpesvirus Saimiri STP Oncogene in Lymphocyte Transformation

Jie Guo,1 Kenneth Williams,2 S. Monroe Duboise,3 Louis Alexander,1 Ronald Veazey,2 and Jae U. Jung1,*

Department of Microbiology and Molecular Genetics1 and Department of Pathology,2 New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772-9102, and Department of Applied Medical Sciences, University of Southern Maine, Portland, Maine 04104-93003

Received 2 December 1997/Accepted 2 February 1998

STP-C488 (STP of herpesvirus saimiri [HVS] group C strain 488 [C488]) is the only virus-encoded protein found to associate with cellular ras and activate ras signal transduction pathways. To investigate an important role for ras signal transduction in STP-dependent growth transformation, we constructed recombinant strains of HVS C488 in which the STP-C488 oncogene was replaced with cellular normal ras (c-ras) or viral oncogenic ras (v-ras). Recombinant HVSDelta STP/v-ras immortalized primary common marmoset T lymphocytes to interleukin-2-independent growth as efficiently as wild-type HVS C488 (wt HVS), while recombinant HVSDelta STP/c-ras did so with low efficiency. Whereas wt HVS immortalized CD4- CD8+ single-positive T lymphocytes, HVSDelta STP/c-ras- and HVSDelta STP/v-ras-immortalized cells were principally CD4+ CD8+ double-positive T lymphocytes. In addition, HVSDelta STP/v-ras-immortalized T cells showed a high level of ras expression and exhibited an adherent macrophage-like morphology. These phenotypes were likely caused by the drastic activation of AP-1 transcriptional factor activity. Finally, HVSDelta STP/v-ras and HVSDelta STP/c-ras each induced lymphoma in one of two common marmosets, although onset of disease was more rapid with the v-ras virus. These results demonstrate that ras can substitute for the STP oncogene of HVS C488 to allow immortalized growth of primary lymphoid cells and that an activated form of ras does so more efficiently than the normal cellular form of ras.

* Corresponding author. Mailing address: New England Regional Primate Research Center, Harvard Medical School, 1 Pine Hill Dr., Southborough, MA 01772. Phone: (508) 624-8083. Fax: (508) 624-8190. E-mail: jjung{at}warren.harvard.med.edu.

J Virol, May 1998, p. 3698-3704, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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