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• W2015474095 endingPage "1993" @default.
• W2015474095 startingPage "1985" @default.
• W2015474095 abstract "Immunosuppression induced by measles virus (MV) is associated with unresponsiveness of peripheral blood lymphocytes (PBL) to mitogenic stimulation ex vivo and in vitro. In mixed lymphocyte cultures and in an experimental animal model, the expression of the MV glycoproteins on the surface of UV-inactivated MV particles, MV-infected cells, or cells transfected to coexpress the MV fusion (F) and the hemagglutinin (H) proteins was found to be necessary and sufficient for this phenomenon. We now show that MV fusion-inhibitory peptides do not interfere with the induction of immunosuppression in vitro, indicating that MV F-H-mediated fusion is essentially not involved in this process. Proteolytic cleavage of MV F(0) protein by cellular proteases, such as furin, into the F(1)-F(2) subunits is, however, an absolute requirement, since (i) the inhibitory activity of MV-infected BJAB cells was significantly impaired in the presence of a furin-inhibitory peptide and (ii) cells expressing or viruses containing uncleaved F(0) proteins revealed a strongly reduced inhibitory activity which was improved following trypsin treatment. The low inhibitory activity of effector structures containing mainly F(0) proteins was not due to an impaired F(0)-H interaction, since both surface expression and cocapping efficiencies were similar to those found with the authentic MV F and H proteins. These results indicate that the fusogenic activity of the MV F-H complexes can be uncoupled from their immunosuppressive activity and that the immunosuppressive domains of these proteins are exposed only after proteolytic activation of the MV F(0) protein." @default.
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• W2015474095 date "2000-02-15" @default.
• W2015474095 modified "2023-09-23" @default.
• W2015474095 title "Proteolytic Cleavage of the Fusion Protein but Not Membrane Fusion Is Required for Measles Virus-Induced Immunosuppression In Vitro" @default.
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• W2015474095 doi "https://doi.org/10.1128/jvi.74.4.1985-1993.2000" @default.
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