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- W2086359463 abstract "A plaque assay was developed for the study of Tipula iridescent virus (TIV) replication using a cell line derived from the fall army worm Spodoptera frugiperda (Sf9). Infection and plaque formation were monitored with time by phase contrast microscopy, video and fluorescent light microscopy. Structure of virions, viroplasmic centres and organelles of infected cells were examined by transmission electron microscopy (TEM). After 4 h postinfection, plaques were visibly detected within the cell monolayer by the presence of localized cell damage and production of numerous vesicular-like cytoplasmic structures. Quantitation of virions present per A260 unit of TIV preparation was determined by TEM. The number of visible plaques corresponded to virus concentration and 1 A260 produced ≈ 105 plaques. DNA hybridization analysis revealed no gross differences in genomic DNA from TIV propagated in either Sf9 cells or wax moth Galleria mellonella larvae. These findings indicate that Sf9 is permissive for replication of TIV and superior by some parameters to other cell lines currently in use for the study of host cell/TIV interactions. Un test de quantification par plages de lyse permettant l'étude de la réplication de l'iridovirus Tipula (TIV) a été mis au point sur une lignée cellulaire dérivée de Spodoptera frugiperda (Sf9). L'infection et la formation des plages ont été suivies par microscopie à contraste de phase, vidéo-microscopie et microscopie à fluorescence. La structure des virions, des centres viroplasmiques et des organites cellulaires infectés a été examinée par microscopie électronique à transmission (TEM). Quatre heures après l'infection, la détérioration des cellules ainsi que la présence de nombreuses structures cytoplasmiques d'aspect vésiculaire, permettent la visualisation de plages sur le tapis cellulaire. La quantification des virions présents par absorption à 260 nm d'une préparation de TIV a été déterminée par TEM. Le nombre de plages visibles correspond à la concentration de virus, et 1 unité A260 produit ca. 105 plages. L'analyse de l'ADN par hybridation n'a pas permis de mettre en évidence de différence significative entre l'ADN génomique provenant du TIV propagé dans la lignée Sf9 ou celui du TIV propagé chez les larves de Galleria mellonella. Ces résultats indiquent que la lignée Sf9 est permissive pour la réplication du TIV et présente plusieurs avantages si on la compare aux autres lignées cellulaires actuellement utilisées pour l'étude des interactions cellule-hôte/TIV." @default.
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- W2086359463 date "1994-01-01" @default.
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- W2086359463 title "Plaque assay and replication of Tipula iridescent virus in Spodoptera frugiperda ovarian cells" @default.
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- W2086359463 doi "https://doi.org/10.1016/s0923-2516(07)80037-9" @default.
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