Enhanced 5-fluorouracil cytotoxicity in high cyclooxygenase-2 expressing colorectal cancer cells and xenografts induced by non-steroidal anti-inflammatory drugs via downregulation of dihydropyrimidine dehydrogenase

Andrea Réti, Éva Pap, Vilmos Adleff, András Jeney, Judit Kralovánszky, Barna Budai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Purpose: To prove that 5-FU cytotoxicity could be increased by combination with low-dose non-steroidal antiinflammatory drugs (NSAIDs) (indomethacin or NS-398) in high cyclooxygenase-2- (COX-2) expressing cells and xenografts through the modulation of dihydropyrimidine dehydrogenase (DPD) mRNA expression and/or enzyme activity. Methods: HT-29 cells were grown on collagen IV coated plates (HT-29-C). The antiproliferative effect of 5-fluorouracil (5-FU) ± NSAIDs was examined on non-COX-2 expressing HT-29 and COX-2-expressing HT-29-C cells by sulphorhodamine B assay. The COX-2 and DPD expressions were visualized by immunofluorescent staining, and prostaglandin E2 levels were measured by ELISA kit. The HT-29 xenograft was established in SCID mice and treated with 5-FU ± NSAIDs for 5 days. The tumor volume, enzyme activity, and DPD mRNA expression were investigated by caliper, radioenzymatic method, and realtime RT-PCR, respectively. The drug interaction was calculated for both combinations (5-FU + indomethacin and 5-FU + NS-398). Results: Collagen IV up-regulated significantly the COX- 2 and DPD mRNA, and protein expressions, and also their enzyme activities in HT-29 cells. NSAIDs enhanced in a synergistic manner the cytotoxic effect of 5-FU treatment both in vitro and in vivo. Downregulation of DPD was observed after 5-FU monotherapy, but the combined effect of NSAIDs and 5-FU on DPD mRNA expression, and enzyme activity was superior to the effect of 5-FU alone. Conclusions: Since 5-FU + NSAID treatment can alter the DPD enzyme activity resulting in an enhanced cytotoxic effect, further studies in clinical practice are warranted.

Original languageEnglish
Pages (from-to)219-227
Number of pages9
JournalCancer Chemotherapy And Pharmacology
Volume66
Issue number2
DOIs
Publication statusPublished - Jul 1 2010

Keywords

  • 5-fluorouracil
  • Cyclooxygenase-2
  • Dihydropyrimidine dehydrogenase
  • Indomethacin
  • NS-398

ASJC Scopus subject areas

  • Oncology
  • Toxicology
  • Pharmacology
  • Cancer Research
  • Pharmacology (medical)

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