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Targeting host pathways essential for virus replication provides an alternate strategy that may reduce opportunities for drug resistance to occur. Oxidative stress is triggered by numerous viruses including HCMV. Peroxynitrite is a reactive nitrogen species that is formed during oxidative stress. Herein, we identified that HCMV rapidly induces the generation of intracellular peroxynitrite upon infection in a manner partially dependent upon xanthine oxidase generation. Peroxynitrite promoted HCMV infection in both cell-free and cell-associated infection systems in multiple cell types. Inhibiting peroxynitrite within the first 24 hours of infection prevented HCMV replication and peroxynitrite promoted cell entry and pp65 translocation into the host cell nuclei. Furthermore, using the murine cytomegalovirus model, we demonstrated that antagonizing peroxynitrite significantly reduces cytomegalovirus replication and pathogenesis\n                      <jats:italic toggle=\"yes\">in vivo<\/jats:italic>\n                      . Overall, our study highlights a proviral role for peroxynitrite in CMV infection and implies that RNS and\/or the mechanisms that induce their production could be targeted as a novel strategy to inhibit HCMV infection.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>IMPORTANCE<\/jats:title>\n                    <jats:p>Human cytomegalovirus (HCMV) causes significant disease in individuals with impaired or immature immune systems, such as transplant patients and after congenital infection. Antiviral drugs that target the virus directly are toxic and are susceptible to antiviral drug resistance due to virus mutations. An alternate strategy is to target processes within host cells that are required by the virus for replication. Herein, we show that HCMV infection triggers a highly reactive molecule, peroxynitrite, during the initial stages of infection. Peroxynitrite was required for the initial entry of the virus into the cell and promotes virus replication in multiple cell types, suggesting a broad pro-viral function. Importantly, targeting peroxynitrite dramatically inhibited cytomegalovirus replication in cells in the laboratory and in mice, suggesting that therapeutic targeting of this molecule and\/or the cellular functions it regulates could represent a novel strategy to inhibit HCMV infection.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/mbio.03152-23","type":"journal-article","created":{"date-parts":[[2024,7,2]],"date-time":"2024-07-02T06:19:01Z","timestamp":1719901141000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["Cytomegalovirus-induced peroxynitrite promotes virus entry and contributes to pathogenesis in a murine model of infection"],"prefix":"10.1128","volume":"15","author":[{"given":"Pragati S.","family":"Amratia","sequence":"first","affiliation":[{"name":"Division of Infection and Immunity\/Systems Immunity University Research Institute, Cardiff University","place":["Cardiff, United 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