The peptide content of MHC class I molecules present at the cell surface is monitored by surveilling CD8 + cytotoxic T cells. In case of a viral infection, a proportion of the MHC class I molecules will carry peptides derived from viral proteins. This allows the CD8 + T cells to recognize and eliminate virus-infected cells. This highly sensitive detection system of the host is counteracted by viruses, which have acquired functions to downregulate cell surface expression of MHC class I molecules. In this chapter, we describe a flow cytometry-based method to identify viral gene product(s) responsible for evasion from MHC class I-restricted antigen presentation. To this end, cells are transiently transfected using polyethylenimine (PEI) as a transfection reagent, followed by cell surface staining with MHC class I-specific monoclonal antibodies. Once viral proteins responsible for MHC class I downregulation have been identified, their mechanism of action can be characterized. Identification and characterization of virus-encoded MHC class I inhibitors augments our understanding of virus-host interactions and often provides new insights into antigen processing and presentation pathways, including related cellular processes such as protein traf fi cking and degradation. © Springer Science+Business Media, LLC 2013.
CITATION STYLE
Horst, D., Ressing, M. E., Mulder, A., & Wiertz, E. J. H. J. (2013). Evaluation of viral interference with mhc class I-restricted antigen processing and presentation using a flow cytometry-based approach. Methods in Molecular Biology, 960, 127–136. https://doi.org/10.1007/978-1-62703-218-6_10
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