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• W3098035932 abstract "Abstract Investigating the dynamics of virus-host interactions in vivo remains an important challenge, often limited by the ability to directly identify virally-infected cells. Here, we combine detection of a beta-lactamase activated fluorescent substrate with full spectrum flow cytometry to identify primary targets of murine gammaherpesvirus 68 (MHV68) infection in the peritoneal cavity. By optimizing substrate and detection conditions, we were able to achieve multiparameter characterization of infected cells and the ensuing host response. MHV68 infection leads to a pronounced increase in immune cells, with CD8+ T cells increasing by 3 days, and total infiltrate peaking around 8 days post-infection. MHV68 infection results in near elimination of large peritoneal macrophages by 8 days post-infection, and a concordant increase in small peritoneal macrophages and monocytes. Infection is associated with prolonged changes to myeloid cells, with a distinct population of MHC II high large peritoneal macrophages emerging by 14 days. Targets of MHV68 infection could be readily detected. Between 1 to 3 days post-infection, MHV68 infects ~5-10% of peritoneal cells, with >75% being large peritoneal macrophages. By 8 days post-infection, the frequency of MHV68 infection is reduced at least 10-fold, with infection primarily in small peritoneal macrophages, with few infected dendritic cells and B cells. MHV68 infection at 3 days post-infection contains both lytic and latent infection, consistent with the identification of cells with active reporter gene expression. Our findings demonstrate the utility of the beta-lactamase MHV68 reporter system for high throughput single-cell analysis and identify dynamic changes during primary gammaherpesvirus infection. Importance Identifying virally-infected cells in vivo is key to tracking viral infection and understanding host-pathogen interactions. The ability to further characterize and phenotype virally-infected cells is technically challenging. We use a mouse gammaherpesvirus, MHV68, expressing a reporter gene to identify infected cells during primary infection via flow cytometry. Optimization using this reporter system allowed us to further characterize infected cells via multiparameter full spectrum flow cytometry. Our study provides a technical model for high throughput single-cell immunophenotyping methods in the context of gammaherpesvirus infection. Furthermore, we show that acute MHV68 infection in the peritoneal cavity dramatically changes the immune landscape of this tissue, results in a high number of infected macrophages at early times, and is characterized by both lytic and latent infection within immune cells." @default.
• W3098035932 created "2020-11-23" @default.
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• W3098035932 date "2020-11-18" @default.
• W3098035932 modified "2023-09-27" @default.
• W3098035932 title "Optimized detection of acute MHV68 infection with a reporter system identifies large peritoneal macrophages as a dominant target of primary infection" @default.
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• W3098035932 doi "https://doi.org/10.1101/2020.11.17.387969" @default.
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