Summary
Cultured human foreskin fibroblasts (HFF) were infected with different multiplicities of infection (moi 0.001-0.1) of human cytomegalovirus (HCMV) strain AD 169 or a clinical isolate. Percentage of infected cells was determined by analysis of immediate early (IEA), early (EA), and late (LA) virus antigen expression with flow cytometry or by immunoperoxidase staining. Changes in the expression of class I MHC surface molecules were demonstrated by comparing the mean fluorescence intensities of infected HFF cultures with those of mock infected cell cultures by flow cytometry. At day three post infection single fluorescence analysis showed that infected HFF cultures split into low and high density class I MHC bearing cells. The addition of anti-interferon β reduced the expression of class I MHC, distinctly. The assumption that infected cells down-regulate and uninfected cells up-regulate their expression of class I MHC molecules was demonstrated by double fluorescence analysis both with flow cytometry and fluorescence microscopy. Analysis of class I MHC-antigen expression versus immediate (IEA, mab E13), early (EA, mab 9221), or late (LA, mab BM219) virus antigen expression yielded three cell populations of HCMV infected HFF cultures three days post infection: 1. uninfected cells with an increase of class I MHC, 2. high density class I MHC, IEA and/or EA expressing cells, and 3. low class I MHC, IEA, EA and LA expressing cells.
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Steinmassl, M., Hamprecht, K. Double fluorescence analysis of human cytomegalovirus (HCMV) infected human fibroblast cultures by flow cytometry: increase of class I MHC expression on uninfected cells and decrease on infected cells. Archives of Virology 135, 75–87 (1994). https://doi.org/10.1007/BF01309766
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DOI: https://doi.org/10.1007/BF01309766