Establishment and characterization of 5-fluorouracil-resistant gastric cancer cells

Young Min Chung, Sun Hee Park., Jong Kuk Park, Yoon Taik Kim, Yoon Koo Kang, Young Do Yoo

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76 Citations (Scopus)


Two 5-fluorouracil (5-FU)-resistant cell lines from a Korean gastric cancer cell line were established by incubation of the cells with increasing concentration of 5-FU, and the resultant cell lines showed an over 800-fold increased resistance to 5-FU. To identify the mechanism of 5-FU resistance, the expressions of genes involved in 5-FU metabolism were examined by reverse transcriptase-polymerase chain reaction (RT-PCR). Expressions of orotate phosphoribosyltransferase (OPRT), thymidine phosphorylase (TP), and uridine phosphorylase (UP) were significantly downregulated in these cell lines, resulting in low incorporation of 5-FU into nucleic acids. In contrast, an increased expression of thymidine kinase (TK) was observed in 5-FU-resistant cells. These results strongly indicate that blocking of 5-FU incorporation into nucleic acids and TK overexpression may play a major role in 5-FU resistance in these cells. Interestingly, these cell lines showed cross- resistance to paclitaxel, cisplatin, and doxorubicin, suggesting that other factors such as HSP27 and Mn-SOD could be also involved in the mechanism of multidrug resistance in these cell lines. (C) 2000 Elsevier Science Ireland Ltd.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalCancer letters
Issue number1
Publication statusPublished - 2000 Oct 16

Bibliographical note

Funding Information:
We thank Dr W.K. Paik at Ajou University for reading the manuscript and helpful suggestions. This work was supported by the National Nuclear R & D Program of the Ministry of Science and Technology of Korea.


  • 5-Fluorouracil
  • 5-Fluorouracil-anabolizing enzymes
  • Cross-resistance
  • Multidrug resistance

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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