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• W3158777789 abstract "Drug repurposing is an important source of new antivirals because many compounds used to treat a variety of pathologies also hamper viral infections. Habitually, silver nanoparticles (AgNPs) have been used to treat bacterial and fungal infections and their antiviral properties have been also reported. In this work, we have studied the antiviral capacity of AgNPs in cells infected with Bunyamwera virus (BUNV), the prototype of the Bunyavirales order. This group of viruses contains important pathogens for humans, animals and plants. Incubation of BUNV-infected Vero cells with non-toxic concentrations of AgNPs, reduced the production of extracellular infectious viruses in up to three orders of magnitude. With a combination of imaging techniques, we have visualized the intracellular distribution of AgNPs in mock- and BUNV-infected cells and studied their effects on intracellular organelles. In mock-infected cells and at short times post-incubation, AgNPs were detected inside nuclei and mitochondria by transmission electron microscopy (TEM). At long times post-treatment, they accumulated inside lysosome-like organelles. Cell compartments did not exhibit any appreciable ultrastructural alterations after incubation with AgNPs. In BUNV-infected cells, AgNPs attached to extracellular virions, that showed a disrupted morphology. Inside cells, they were detected inside the nucleus, in mitochondria and around characteristic Golgi-associated, single-membrane spherules. These membranous structures are the replication organelles (ROs) of bunyaviruses and contain active viral replication complexes (VRCs). Compared to normal spherules that are round, compact and have an electron-dense core, spherules in AgNPs-treated cells were deformed and their core was electron-lucent. Interestingly, in BUNV-infected cells treated with the typical antiviral ribavirin (RBV), spherules with VRCs exhibit also an anomalous morphology and an electron-lucent core. Both AgNPs and RBV might interfere with BUNV-induced dismantling of cell nucleoli and with the intercellular propagation of large groups of virions, a mechanism of BUNV transmission observed for the first time in cultured cells. Our results point to silver nanoparticles as good candidates for antiviral therapy, either alone or in combination with other antiviral drugs, such as RBV-related compounds." @default.
• W3158777789 created "2021-05-10" @default.
• W3158777789 creator A5003142246 @default.
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• W3158777789 date "2021-09-01" @default.
• W3158777789 modified "2023-09-26" @default.
• W3158777789 title "Light and electron microscopy imaging unveils new aspects of the antiviral capacity of silver nanoparticles in bunyavirus-infected cells" @default.
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• W3158777789 doi "https://doi.org/10.1016/j.virusres.2021.198444" @default.
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