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• W2143746835 startingPage "483" @default.
• W2143746835 abstract "The proteasome is the principal provider of major histocompatibility complex (MHC) class I-presented peptides. Interferon (IFN)-gamma induces expression of three catalytically active proteasome subunits (LMP2, LMP7, and MECL-1) and the proteasome-associated activator PA28. These molecules are thought to optimize the generation of MHC class I-presented peptides. However, known information on their contribution in vivo is very limited. Here, we examined the antigen processing of two murine leukemia virus-encoded cytotoxic T lymphocyte (CTL) epitopes in murine cell lines equipped with a tetracycline-controlled, IFN-gamma-independent expression system. We thus were able to segregate the role of the immunosubunits from the role of PA28. The presence of either immunosubunits or PA28 did not alter the presentation of a subdominant murine leukemia virus (MuLV)-derived CTL epitope. However, the presentation of the immunodominant MuLV-derived epitope was markedly enhanced upon induction of each of these two sets of genes. Thus, the IFN-gamma-inducible proteasome subunits and PA28 can independently enhance antigen presentation of some CTL epitopes. Our data show that tetracycline-regulated expression of PA28 increases CTL epitope generation without affecting the 20S proteasome composition or half-life. The differential effect of these IFN-gamma-inducible proteins on MHC class I processing may have a decisive influence on the quality of the CTL immune response." @default.
• W2143746835 created "2016-06-24" @default.
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• W2143746835 date "2000-08-14" @default.
• W2143746835 modified "2023-10-01" @default.
• W2143746835 title "Differential Influence on Cytotoxic T Lymphocyte Epitope Presentation by Controlled Expression of Either Proteasome Immunosubunits or Pa28" @default.
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• W2143746835 doi "https://doi.org/10.1084/jem.192.4.483" @default.
• W2143746835 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2193234" @default.
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