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• W2154604531 abstract "Hypoxic cells in tumours are resistant to 5-fluorouracil (5-FU). This in vivo study investigated the ability of hypoxia to regulate the gene expression of thymidylate synthase (TS), the target enzyme of 5-FU.C3H mammary carcinomas, grown in the feet of female CDF1 mice, were used for all experiments. Mice were placed in a 10% oxygen environment for various time periods and the tumour oxygen status was determined with an Eppendorf oxygen electrode. The animals were then injected with BrdU (100 mg/kg, i.p.). Tumours were excised and immediately frozen (-80 degrees C) until isolation of total RNA. The mRNA was reversibly transcribed to complementary DNA and the resulting cDNA amplified in a multiplex PCR reaction, with beta-actin as the internal reference gene.One hour of low oxygen breathing made tumours significantly more hypoxic. This increase was maintained for a maximum incubation period of 48 h. In the same tumours, no change in TS gene expression was seen with up to 3 h of low oxygen breathing. At longer times it decreased, reaching significance at 12-24 h and remaining at this lower level for up to 48 h. BrdU labelling was significantly reduced after breathing low O2 for 24 h (p = 0.001).Hypoxia-induced down-regulation of TS gene expression was observed. This would be expected to make hypoxic tumour cells more sensitive to 5-FU. Other mechanisms must be responsible for the previously reported resistance to this drug." @default.
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• W2154604531 date "1999-01-01" @default.
• W2154604531 modified "2023-09-27" @default.
• W2154604531 title "The ability of hypoxia to modify the gene expression of thymidylate synthase in tumour cells in vivo" @default.
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• W2154604531 doi "https://doi.org/10.1080/095530099139944" @default.
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