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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Reactivation of feline foamy virus from a chronically infected feline renal cell line by trichostatin A.

Although acute infection of feline foamy virus (FeFV) is normally highly cytopathogenic in Crandell feline kidney (CRFK) cells, a noncytopathic persistent infection was established in the cells after cocultivation of the initially infected cells with uninfected cells four times. To investigate reactivation of persistent infection, CRFK cells chronically infected with FeFV were treated with trichostatin A (TA), a histone deacetylase inhibitor. TA induced higher FeFV production from the Coleman strain carrier culture and also induced marked syncytium formation. In contrast, human foamy virus, which contains less homologous long terminal repeat (LTR) and putative internal promoter (IP) sequences, persistently infecting baby hamster kidney cells was not reactivated by TA. The Sammy-1 strain of FeFV, from which a part of the U3 region in the LTR is naturally deleted, showed less reactivation. The Coleman LTR promoter-based beta-Gal-expressing plasmid was activated in the persistently Coleman-infected cells in the presence of TA, whereas the Sammy-1 LTR was not activated. Furthermore, the amounts of Gag protein expressed did not change in the presence or absence of TA. Because the putative IP region was very similar between the two strains, the initiation by TA is relatively specific for LTR sequences, and, therefore, histone deacetylation is at least in part responsible for reactivation of FeFV from carrier cell culture.[1]


  1. Reactivation of feline foamy virus from a chronically infected feline renal cell line by trichostatin A. Hatama, S., Otake, K., Ohta, M., Kobayashi, M., Imakawa, K., Ikemoto, A., Okuyama, H., Mochizuki, M., Miyazawa, T., Tohya, Y., Fujii, Y., Takahashi, E. Virology (2001) [Pubmed]
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