Overexpression of DNA replication and repair enzymes in cisplatin-resistant human colon carcinoma HCT8 cells and circumvention by azidothymidine.

K. J. Scanlon, M. Kashani-Sabet, L. C. Sowers

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

Biochemical differences were demonstrated between two cell lines derived from a human colon carcinoma (HCT8), one sensitive (HCT8S), and one 4.3-fold resistant to cisplatin (HCT8DDP). The cisplatin-resistant cell line overexpressed five enzymes (dihydrofolate reductase, thymidine 5'-monophosphate synthase, thymidine kinase, and DNA polymerase alpha and beta) believed to be important for DNA replicative and repair synthesis. In addition, the c-fos and c-H-ras oncogenes were also overexpressed in the HCT8DDP cells. This apparent overexpression was not associated with increases in gene copy number, it was related, however, to increased mRNA content. Expression of these key enzymes may be a significant factor in the development of clinical resistance to cisplatin. Further, these specific changes in cellular metabolism associated with cisplatin resistance may be exploited by the use of nucleoside analogues.

Original languageEnglish (US)
Pages (from-to)269-275
Number of pages7
JournalCancer communications
Volume1
Issue number4
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Cancer Research

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