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Expression of cytolytic t lymphocyte defined akr gross retrovirus associated tumor antigens by normal spleen cells control by fv 1 h 2 and proviral genes and effect on antiviral cytolytic t lymphocyte generation



Expression of cytolytic t lymphocyte defined akr gross retrovirus associated tumor antigens by normal spleen cells control by fv 1 h 2 and proviral genes and effect on antiviral cytolytic t lymphocyte generation



Journal of Immunology 136(1): 308-312



In previous studies we have characterized H-2-restricted cytolytic T lymphocytes (CTL) type specific for Gross cell surface antigen-positive tumor cells induced by AKR/Gross leukemia viruses. The generation of such CTL was shown to be controlled by at least three genetic loci including H-2 and Fv-1. The Fv-1n phenotype was able to negate positive immune response gene effects of the H-2b haplotype. Fv-1n-mediated inhibition appeared to operate by allowing the early expression by normal cells of N-ecotropic leukemia virus-related antigens recognized by the antiviral CTL, perhaps via tolerance induction. In the present study, the expression of CTL-defined viral antigens by normal cells is further considered. Possible gene dosage effects by H-2 as well as Fv-1 and the other virus-related (V) genes, including proviral structural loci, were examined by comparison of a panel of congenic and F1 mice. These experiments indicated that the quantitative level of expression of CTL-defined viral antigens was primarily controlled by the Fv-1 genotype. Gene dosage effects were also observed for the V genes and, in some situations, for H-2. The importance of the early display of viral antigens by normal cells was underscored by the inability of those mice to generate specific antiviral CTL responses. Even strains expressing low levels of viral antigens, such as responder .times. nonresponder (AKR.H-2b:Fv-1b .times. AKR.H-2b)F1 mice, failed to respond. These results are discussed with respect to the inability of mice of the AKR background to respond with specific antiviral CTL generation and in light of their high incidence of spontaneous leukemia.

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Accession: 005430545

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