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Control of Advanced Choroid Plexus Tumors in SV40 T Antigen Transgenic Mice Following Priming of Donor CD8⁺ T Lymphocytes by the Endogenous Tumor Antigen¹

Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033

Mouse models in which tumors arise spontaneously due to the transgenic expression of an oncoprotein provide an opportunity to test approaches that target the immune-mediated control of tumor progression. In this report we investigated the role of SV40 Tag-specific CD8⁺ T cells in the control of advanced choroid plexus tumor progression using large tumor Ag (Tag) transgenic mice. Since mice of the SV11 line are tolerant to the immunodominant SV40 Tag-derived CTL epitopes, mice with advanced stage tumors were reconstituted with naive C57BL/6 spleen cells following a low dose of -irradiation. This led to the priming of CTLs specific for the H2-K^b-restricted epitope IV by the endogenous Tag and a significant increase in the life span of Tag transgenic mice. Epitope IV-specific CD8⁺ T cells accumulated and persisted in the brains and tumors of SV11 mice, as determined by analysis with epitope-specific MHC class I tetramers. Brain-infiltrating epitope IV-specific T cells were capable of producing IFN- as well as lysing syngeneic Tag-transformed cells in vitro. In addition, the adoptive transfer of spleen cells from Tag-immune C57BL/6 mice resulted in a dramatic increase in the control of tumor progression in SV11 mice and was associated with the accumulation of CD8⁺ T cells specific for multiple Tag epitopes in the brain. These results indicate that the control of advanced stage spontaneous choroid plexus tumors is associated with the induction of a strong and persistent CD8⁺ T cell response to Tag.

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