Persistent expression of v-mos oncogene in transformed cells that revert to nonmalignancy after prolonged treatment with interferon
Autor: | D Sergiescu, A M Joret, C Chany, Jacqueline Gerfaux |
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Rok vydání: | 1986 |
Předmět: |
Moloney Sarcoma Virus
viruses Moloney murine sarcoma virus Biology Virus Cell Line Sarcoma Viruses Murine Mice Interferon Gene expression medicine Animals Mice Inbred BALB C Multidisciplinary Oncogenes Transfection Fibroblasts Embryo Mammalian Virology Cell Transformation Neoplastic Cell culture Helper virus Interferon Type I RNA Viral Interferon type I Research Article medicine.drug |
Zdroj: | Proceedings of the National Academy of Sciences. 83:5764-5768 |
ISSN: | 1091-6490 0027-8424 |
Popis: | BALB/c embryonic fibroblasts productively transformed by Moloney sarcoma virus and cultivated for over 600 generations in the presence of mouse alpha/beta interferon reverted to an apparently normal phenotype and were unable to produce tumors in nude mice. Nevertheless, the presence of an integrated Moloney sarcoma virus genome in the nonmalignant Moloney sarcoma virus-transformed interferon-treated cell DNA could be shown by focus formation upon transfection and by hybridization with a v-mos probe. After digestion with various restriction endonucleases, similar hybridization patterns of v-mos sequences were obtained with DNAs from both reverted and transformed cells. However, additional integration sites and at least twice as many copies of the oncogene were found in the nonmalignant Moloney sarcoma virus-transformed interferon-treated cell DNA. Polyadenylylated RNA extracted from reverted and control cells contained two mos-specific transcripts. Interestingly, the nonmalignant Moloney sarcoma virus-transformed interferon-treated cells produced helper virus, but no detectable mos-containing virions, suggesting that a posttranscriptional block in the v-mos gene expression had occurred in these cells. It should be stressed that, after up to 100 additional passages, cells cultured in the absence of interferon maintained their nontumorigenic character in spite of the persistent transcription of the mos oncogene. |
Databáze: | OpenAIRE |
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