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- W2211345314 abstract "We selected a 2-difluoromethylornithine-resistant Ehrlich ascites-carcinoma cell line that grows in the presence of 20 mM-difluoromethylornithine. These cells contain 10-20 times the normal amount of hybridizable sequences for ornithine decarboxylase (EC 4.1.1.17) in their genomic DNA. We used these gene-amplified cells, their revertant counterparts (grown in the absence of the drug after an established gene amplification) and tumour cells grown in the presence of putrescine to investigate the changes of ornithine decarboxylase gene pattern and simultaneously occurring phenotypic changes, such as tumourigenicity and the expression of cell-surface glycoproteins. In the tumour cells reverted back to the normal gene frequency, not only did the amplified sequences disappear, but there were also signs of gene re-arrangements seen as a ‘gene jump’, when a signal evidently moved to a heavier restriction fragment. Similar gene re-arrangement likewise occurred in cells exposed to putrescine. Although the wild-type tumour cells and the gene-amplified cells readily grew in the peritoneal cavity of mice, the revertant cells and the putrescine-treated cells had lost their tumourigenicity in mice. Gene-amplified tumour cells and the revertant cells showed distinct changes in their surface glycoprotein pattern in comparison with the parental cell line. These findings indicate that alterations of ornithine decarboxylase gene pattern/dosage may be associated with phenotypic changes possibly related to the tumourigenicity of these carcinoma cells." @default.
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- W2211345314 date "1985-08-01" @default.
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- W2211345314 title "Tumourigenicity, cell-surface glycoprotein changes and ornithine decarboxylase gene pattern in Ehrlich ascites-carcinoma cells" @default.
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- W2211345314 doi "https://doi.org/10.1042/bj2290711" @default.
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