Increased cytotoxicity and bystander effect of 5-fluorouracil and 5'-deoxy-5-fluorouridine in human colorectal cancer cells transfected with thymidine phosphorylase

91Citations
Citations of this article
56Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

5-Fluorouracil (5-FU) and 5'-deoxy-5-fluorouridine (5'-DFUR), a prodrug of 5-FU, are anticancer agents activated by thymidine phosphorylase (TP). Transfecting the human TP cDNA into cancer cells in order to sensitize them to these pyrimidine antimetabolites may be an important approach in human cancer gene therapy research. In this study, an expression vector containing the human TP cDNA (pcTP5) was transfected into LS174T human colon carcinoma cells. Eight stable transfectants were randomly selected and analysed. The cytotoxic effects of 5-FU and 5'-DFUR were higher in TP-transfected cells as compared to wild-type cells. The maximal decreases in the IC50 were 80-fold for 5-FU and 40-fold for 5'-DFUR. The increase in sensitivity to these pyrimidines of TP-transfected cells significantly correlated with the increase in both TP activity and TP expression. Transfected clone LS174T-c2 but not wild-type cells exhibited formation of [3H]FdUMP from [3H]5-FU. In addition the LS174T-c2 clone enhanced the cytotoxic effect of 5'-DFUR, but also that of 5-FU, towards co-cultured parental cells. For both anti-cancer agents, this bystander effect did not require cell-cell contact. These results show that both 5-FU or 5'-DFUR could be used together with a TP-suicide vector in cancer gene therapy.

Cite

CITATION STYLE

APA

Evrard, A., Cuq, P., Ciccolini, J., Vian, L., & Cano, J. P. (1999). Increased cytotoxicity and bystander effect of 5-fluorouracil and 5’-deoxy-5-fluorouridine in human colorectal cancer cells transfected with thymidine phosphorylase. British Journal of Cancer, 80(11), 1726–1733. https://doi.org/10.1038/sj.bjc.6690589

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free