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Research Article

Immortalization of human fibroblasts transformed by origin-defective simian virus 40.

D S Neufeld, S Ripley, A Henderson, H L Ozer
D S Neufeld
Department of Biological Sciences, Hunter College, City University of New York, New York 10021.
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S Ripley
Department of Biological Sciences, Hunter College, City University of New York, New York 10021.
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A Henderson
Department of Biological Sciences, Hunter College, City University of New York, New York 10021.
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H L Ozer
Department of Biological Sciences, Hunter College, City University of New York, New York 10021.
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DOI: 10.1128/MCB.7.8.2794
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ABSTRACT

Simian virus 40 (SV40)-mediated transformation of human diploid fibroblasts has provided an effective experimental system for studies of both "senescence" in cell culture and carcinogenesis. Previous interpretations may have been complicated, however, by the semipermissive virus-cell interaction. In earlier studies, we previously demonstrated that the human diploid fibroblast line HS74 can be efficiently transformed by DNA from replication-defective mutants of SV40 containing a deletion in the viral origin for DNA synthesis (SVori-). In the current study, we found that such SVori- transformants show a significantly increased life span in culture, as compared with either HS74 or an independent transformant containing an intact viral genome, but they nonetheless undergo senescence. We have clonally isolated six immortalized derivatives of one such transformant (SV/HF-5). Growth studies indicate that the immortalized cell lines do not invariably grow better than SV/HF-5 or HS74. Genetic studies involving karyotypic analysis and Southern analysis of integrated viral sequences demonstrated both random and nonrandom alterations. All immortalized derivatives conserved one of the two copies of SV40 sequences which expressed a truncated T antigen. These cloned SV40-transformed cell lines, pre- and postimmortalization, should be useful in defining molecular changes associated with immortalization.

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Immortalization of human fibroblasts transformed by origin-defective simian virus 40.
D S Neufeld, S Ripley, A Henderson, H L Ozer
Molecular and Cellular Biology Aug 1987, 7 (8) 2794-2802; DOI: 10.1128/MCB.7.8.2794

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Immortalization of human fibroblasts transformed by origin-defective simian virus 40.
D S Neufeld, S Ripley, A Henderson, H L Ozer
Molecular and Cellular Biology Aug 1987, 7 (8) 2794-2802; DOI: 10.1128/MCB.7.8.2794
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