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Transforming Genes of Human Bladder and Lung Carcinoma Cell Lines Are Homologous to the Ras Genes of Harvey and Kirsten Sarcoma Viruses

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Specialty Science
Date 1982 Jun 1
PMID 6285355
Citations 228
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Abstract

Blot hybridization analysis indicated that NIH 3T3 mouse bladder transformed by high molecular weight DNAs of a human bladder and a human lung carcinoma cell line contained new sequences homologous, respectively, to the transforming genes of Harvey (rasH) and Kirsten (rasK) sarcoma viruses. The unique ras sequences were present in multiple independent NIH cell lines transformed in both primary and secondary transfection assays and corresponded to ras sequences normally present in human DNAs. The ras gene product was expressed in NIH cells transformed by bladder carcinoma DNAs and in the human bladder carcinoma cell lines at levels 2- to 4-fold greater than the level observed in nontransformed NIH 3T3 cells. These results indicate that the transforming genes of these human tumor cell lines are the cellular homologs of two retroviral transforming genes.

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