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Schedule-dependent cytotoxicity of 5-fluorouracil and irinotecan in a colon cancer cell line

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Abstract

Background

Our aim was to clarify the significance of widely accepted irinotecan (CPT-11)/5-fluorouracil (5-FU) combinations in colon cancer by investigating their sequential effect.

Methods

The sequential effect of CPT-11/5-FU in two colon cancer cell lines, LoVo and SW480, was evaluated by WST-8 colorimetric assay. The cell cycle distributions of each drug were analyzed by flow cytometry, and then the chemoresistant mechanisms and expression of a drug transporter (MDR1), the bcl-2 apoptotic pathway, metabolizing enzymes [carboxylesterase (CE), dihydropyrimidine dehydrogenase], and target enzymes (topoisomerase I, thymidine synthase) associated with sequence-dependent cytotoxicity were examined.

Results

The cytotoxicity of 5-FU (10, 100, 1000 µM) followed by CPT-11 (1 µM) was significantly greater than that of CPT-11 (1 µM) followed by 5-FU (10, 100, 1000 µM) (P < 0.05). Reverse transcription-polymerase chain reaction analysis revealed that exposure to 5-FU downregulated both MDR1 and bcl-2 mRNA and simultaneously upregulated CE2 mRNA expression, suggesting enhancement of subsequent CPT-11 cytotoxicity.

Conclusions

The cytotoxic effects of the CPT-11/5-FU combinations were shown to be schedule-dependent in human colon cancer cells. The findings suggest that 5-FU followed by CPT-11 administration might be the optimal sequence for CPT-11/5-FU treatment of advanced colon cancer.

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Inoue, Y., Miki, C., Watanabe, H. et al. Schedule-dependent cytotoxicity of 5-fluorouracil and irinotecan in a colon cancer cell line. J Gastroenterol 41, 1149–1157 (2006). https://doi.org/10.1007/s00535-006-1904-0

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  • DOI: https://doi.org/10.1007/s00535-006-1904-0

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