Interferon-induced modulation of human ras oncogene expression.
Treatment of NIH 3T3 cells with interferon (IFN) after transfection with human bladder carcinoma EJ/T24 c-Ha-ras1 oncogene DNA caused inhibition of ras-induced cell transformation. Furthermore, the effect of IFN on oncogene expression in an established tumor line was studied. A tumor line of NIH 3T3 (RS485) was transformed by human c-Ha-ras1 activated by a viral long terminal repeat. Treatment of the tumor cells with IFN was associated with a progressive appearance of reverted, flat colonies which exhibited a normal phenotype with respect to morphology and growth. The revertants were well spread, contact inhibited cells; they did not grow in soft agar and were not tumorigenic in nude mice. Revertants retained their normal phenotype, although they contained transfecting human c-Ha-ras1 DNA; but, they produced significantly decreased levels of the onc-encoded protein p21 and c-Ha-ras1 mRNA as compared to RS485 cells.
Samid
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D
Schaff
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Chang
E H
EH
Friedman
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RM
D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D006801:Humans; D007372:Interferons / Q000494:pharmacology*; D051379:Mice; D008815:Mice, Inbred Strains; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009857:Oncogenes / Q000187:drug effects; D014183:Transplantation, Heterologous; D001749:Urinary Bladder Neoplasms / Q000235:genetics*
D007372:Interferons