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• W1566852999 abstract "We investigated the effects of 2'-deoxyinosine (d-Ino), a modulator yielding thymidine phosphorylase activity, on cellular pharmacology of 5-fluorouracil (FUra) in various human colorectal cell lines and its antitumoral activity when combined with FUra in human xenografts. Associating d-Ino with FUra increased by 38 up to 700 times the sensitivity of HT29 and FUra-resistant SW620 lines, respectively, but not of CaCO2 cells, although high levels of intracellular FdUMP and subsequent higher thymidylate synthase inhibition were observed. Cell death studies confirmed the ability of d-Ino to enhance both early and late apoptosis induced by FUra in HT29 and SW620 but not in CaCo2. Similarly, we showed that associating d-Ino increased by 68 up to 101% the Fas overexpression induced by FUra in HT29 and SW620 but not in CaCo2 cells. Anti-Fas and anti-FasL antibodies both partly reversed this increase of cell sensitivity, thus confirming the role Fas plays in the modulation of FUra toxicity by d-Ino. This Fas component could explain the discrepancy between the lines because CaCO2 has been described as insensitive to Fas-mediated apoptosis. Antitumor activity of the combination was next investigated in nude mice transplanted with SW620. Results showed that although FUra alone has little effect on SW620 xenografts (P > 0.05), associating d-Ino significantly reduced the tumor growth by 57% (P < 0.05). This study suggests that it is possible to reduce both in vitro and in vivo resistance to FUra by modulating the way the drug is converted after cellular uptake." @default.
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• W1566852999 date "2000-04-01" @default.
• W1566852999 modified "2023-10-18" @default.
• W1566852999 title "Enhanced antitumor activity of 5-fluorouracil in combination with 2'-deoxyinosine in human colorectal cell lines and human colon tumor xenografts." @default.
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