Interferon Induces Morphologic Reversion with Elimination of Extrachromosomal Viral Genomes in Bovine Papillomavirus-Transformed Mouse Cells

The effect of mouse L-cell interferon on bovine papillomavirus type 1 (BPV-1) transformation of murine cells was examined. Mouse interferon reduced the level of BPV-1-induced transformation of mouse C127 cells by 95%. Long-term treatment of established BPV-1-transformed mouse cell clones with mouse...

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Published in:Proceedings of the National Academy of Sciences - PNAS 1982-12, Vol.79 (24), p.7914-7918
Main Authors: Turek, Lubomir P., Byrne, Janet C., Lowy, Douglas R., Dvoretzky, Israel, Friedman, Robert M., Howley, Peter M.
Format: Article
Language:English
Subjects:
Bovine papillomavirus 1 - genetics
Bovine papillomavirus 1 - growth & development
Cell lines
Cell Transformation, Viral - drug effects
Daughter cells
DNA, Viral - genetics
Genomes
Infections
Interferons
Interferons - pharmacology
L cells
Papillomaviridae
Plasmids
T lymphocytes
Transformed cell line
Viral genomes
Virus Replication - drug effects
Viruses
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Summary:The effect of mouse L-cell interferon on bovine papillomavirus type 1 (BPV-1) transformation of murine cells was examined. Mouse interferon reduced the level of BPV-1-induced transformation of mouse C127 cells by 95%. Long-term treatment of established BPV-1-transformed mouse cell clones with mouse L-cell interferon led to a decrease in the average number of the plasmid viral genomes present in these cells to 1/3 to 1/8. Although revertant lines could not be isolated from these lines in the absence of treatment with interferon, flat revertants were easily selected from two independent clonal transformed lines carried for 60 generations in the continued presence of 200 units of interferon per ml. These flat revertants had the biological characteristics of nontransformed C127 cells and could be retransformed by BPV-1. Southern blot hybridization failed to detect BPV-1 DNA in any of eight independent revertant lines examined under conditions that could detect 0.2 copies per cell. We conclude that interferon treatment has resulted in a selective reduction of the amount of extrachromosomal BPV-1 DNA in transformed cells and has cured some treated cells completely of their viral DNA.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.79.24.7914