Evaluation of in vitro cytotoxicity of oxaliplatin and 5-fluorouracil in human colon cancer cell lines: combination versus sequential exposure.

Abstract:

:Adjuvant therapy has evolved to become the standard care of colon cancer, but the tumor capability of activating effective mechanisms of defence against both chemical and physical cytotoxic agents represents a serious obstacle to the successful therapy. Furthermore, the possibility to have an assay useful to measure the drug sensitivity of tumor cells could be of a great importance. As primary human colon cancer cultures from fresh tumor are technically difficult to obtain, experiments with human cancer cell lines remain essential to explore new adjuvant chemotherapy drugs, to investigate the individual responsiveness to the known agents, and particularly to clarify how these chemotherapeutic agents could be used in maximizing outcomes. In the present study we evaluate the cytotoxic effects of 5-fluorouracil (5-FU) and oxaliplatin (OHP) and of their pharmacological interaction in three human colon cancer cell lines (WiDr, HT-29 and SW620), by using an ATP luminescence assay (ATPlite; Perkin Elmer), displaying high sensitivity, linearity and reproducibility. Cell cycle, apoptosis and CD44 expression were investigated with flow cytometry. Our results show that the drug combinations inhibited the cell growth more than each drug alone in all colorectal cancer cell lines. Interestingly, the sequential exposure of OHP and 5-FU resulted in the most cytotoxic effect in all colon cancer cell lines, when compared to the simultaneous one. Our results focus on the powerful cytotoxic effect of 5-FU-OHP combination, when used in sequential exposure, suggesting interesting implications for a rational use of 5-FU, OHP combination in colon-rectal cancer therapy.

authors

Failli A,Consolini R,Legitimo A,Orsini G,Romanini A,Spisni R,Castagna M,Miccoli P

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

575-88

issue

4

eissn

0393-974X

issn

1724-6083

pii

9

journal_volume

25

pub_type

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