Abstract
The sensitivity of cell cultures to adenovirus types 40 and 41 (Ad 40 41 ) was compared by means of cell culture infectious dose (ID 50) assays using monolayer cultures in microtitre plates. The PLC/PRF/5 cell line derived from a primary human hepatocellular carcinoma was 100 times more sensitive to a laboratory strain of Ad41, and 10 times more sensitive to a laboratory strain of Ad40 and two Ad41 stool isolates, than Graham 293 and Chang conjunctival cells commonly used for the propagation of these viruses. In microtitre plate titration assays PLC/PRF/5 cells retained an optimal condition for longer and displayed cytopathogenic effects earlier and more clearly than the other cell lines. In contrast to previously used cells, PLC/PRF/5 cells also proved successful for the quantitation of Ad41, but not Ad40, by conventional plaque assays. The reason for the exceptional susceptibility of PLC/PRF/5 cells has not been elucidated, but the findings open attractive new doors for research on Ad 40 41 .
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