Codominance of cisplatin resistance in somatic cell hybrids

Yu Lan Mary Ying, Ding Wu Shen, Xing Jie Liang, Michael M. Gottesman

Research output: Contribution to journalArticle

3 Scopus citations


Intrinsic or acquired resistance to cisplatin in cancer cells remains a major obstacle to successful chemotherapy. The clinically relevant genetic and molecular mechanisms of resistance have not yet been identified. Cisplatin-resistant (CP-r) human KB epidermoid carcinoma cell lines (HeLa) resistant to varying levels of cisplatin after single and multiple selection steps are cross-resistant to other platinum compounds and to methotrexate. Intraspecies hybrids of the sensitive and KB CP-r cells were fused with HeLa D98OR CP-s, hypoxanthine-aminopterin-thymidine (HAT) sensitive, ouabain resistant, to determine whether cisplatin resistance is dominant or recessive. Cell-cell hybridization between the sensitive cells and single-step or two-step KB CP-r cells both indicated codominance of cisplatin resistance compared to hybrids between sensitive cell lines (D98ORxKB). The hybrids between sensitive cell lines (D98xKB) and a single-step CP-r KB cell line (D98xKB-CP.5) also were cross-resistant to carboplatin and methotrexate. In addition, the relatively slower growth rate of CP-r cells appears to be dominant. In the two-step CP-r KB cell line, KB-CP1, resistance is no more dominant than in the single-step CP-r KB cell line, KB-CP.5, suggesting that one of the two steps of resistance in KB-CP1 may not be dominant. These dominance data suggest that it might be possible to identify one or more genes responsible for cisplatin resistance by gene transfer from a resistant cell line to a sensitive cell line.

Original languageEnglish (US)
Pages (from-to)63-69
Number of pages7
JournalJournal of Cellular Physiology
Issue number1
StatePublished - Jul 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Biochemistry
  • Cell Biology

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