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Journal of Virology, July 1999, p. 5981-5993, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Cytotoxic T-Lymphocyte Epitope Immunodominance in the Control of Choroid Plexus Tumors in Simian Virus 40 Large T Antigen Transgenic Mice

Todd D. Schell,1 Lawrence M. Mylin,1 Ingo Georgoff,2,dagger Angelica K. Teresky,2 Arnold J. Levine,2,Dagger and Satvir S. Tevethia1,*

Department of Microbiology and Immunology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033,1 and Department of Molecular Biology, Princeton University, Princeton, New Jersey 085442

Received 10 February 1999/Accepted 11 April 1999

The simian virus 40 (SV40) large tumor antigen (Tag) is a virus-encoded oncoprotein which is the target of a strong cytotoxic T-lymphocyte (CTL) response. Three immunodominant H-2b-restricted epitopes, designated epitopes I, II/III, and IV, have been defined. We investigated whether induction of CTLs directed against these Tag epitopes might control Tag-induced tumors in SV11+ (H-2b) mice. SV11+ mice develop spontaneous tumors of the choroid plexus due to expression of SV40 Tag as a transgene. We demonstrate that SV11+ mice are functionally tolerant to the immunodominant Tag CTL epitopes. CTLs specific for the H-2Kb-restricted Tag epitope IV were induced in SV11+ mice following adoptive transfer with unprimed C57BL/6 spleen cells and immunization with recombinant vaccinia viruses expressing either full-length Tag or the H-2Kb-restricted epitope IV as a minigene. In addition, irradiation of SV11+ mice prior to adoptive transfer with unprimed C57BL/6 spleen cells led to the priming of epitope IV-specific CTLs by the endogenous Tag. Induction of epitope IV-specific CTLs in SV11+ mice by either approach correlated with increased life span and control of the choroid plexus tumor progression, indicating that CTLs specific for the immunodominant Tag epitope IV control the progressive growth of spontaneous tumors induced by this DNA virus oncogene in transgenic mice.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, H107, The Pennsylvania State University College of Medicine, 500 University Dr., Hershey, PA 17033. Phone: (717) 531-8872. Fax: (717) 531-5578. E-mail: sst1{at}psu.edu.

dagger Present address: Wyeth Ayerst Research, Radnor, PA 19078.

Dagger Present address: Rockefeller University, New York, NY 10021.

Journal of Virology, July 1999, p. 5981-5993, Vol. 73, No. 7
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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