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MHC class II hierarchy of superantigen presentation predicts efficiency of infection with mouse mammary tumor virus.
Superantigens (SAgs) encoded by infectious mouse mammary tumor viruses (MMTVs) play a crucial role in the viral life cycle. Their expression by infected B cells induces a proliferative immune response by SAg-reactive T cells which amplifies MMTV infection. This response most likely ensures stable MMTV infection and transmission to the mammary gland. Since T cell reactivity to SAgs from endogenous Mtv loci depends on MHC class II molecules expressed by B cells, we have determined the ability of MMTV to infect various MHC congenic mice. We show that MHC class II I-E+ compared with I-E- mouse strains show higher levels of MMTV infection, most likely due to their ability to induce a vigorous SAg-dependent immune response following MMTV encounter. Inefficient infection is observed in MHC class II I-E- mice, which have been shown to present endogenous SAgs poorly. Therefore, during MMTV infection the differential ability of MHC class II molecules to form a functional complex with SAg determines the magnitude of the proliferative response of SAg-reactive T cells. This in turn influences the degree of T cell help provided to infected B cells and therefore the efficiency of amplification of MMTV infection.
Animals, Antigen Presentation/immunology, B-Lymphocytes/immunology, DNA, Viral/analysis, Female, Flow Cytometry, Histocompatibility Antigens Class II/immunology, Major Histocompatibility Complex/immunology, Male, Mammary Tumor Virus, Mouse/genetics, Mammary Tumor Virus, Mouse/immunology, Mice, Mice, Inbred BALB C, Mice, Inbred C57BL, Mice, Mutant Strains, Mice, Transgenic, Polymerase Chain Reaction, Retroviridae Infections/immunology, Superantigens/immunology, T-Lymphocytes/immunology, Tumor Virus Infections/immunology
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