Journal of Biomedical Science

, Volume 1, Issue 2, pp 131–138 | Cite as

Reduced inhibition of DNA synthesis and G2 arrest during the cell cycle of resistant HeLa cells in response tocis-diamminedichloroplatinum

  • Sue Lin-Chao
  • Chuck C. K. Chao
Original Paper

Abstract

The influence of cisplatin, an anticancer agent, on DNA synthesis and cell cycle progression of a cisplatin-resistant cell line was investigated. Cell cycle analysis using flow cytometry showed that cytotoxic concentrations of cisplatin caused a transient inhibition of parental HeLa cells at S phase, followed by accumulation at G2 phase. In contrast, the resistant cells progressed through the cell cycle without being affected by the same treatment. However, cell cycle distributions were the same in the resistant and the parental cells at IC50, the drug concentration inhibiting cell growth by 50%. Studies using a [3H]thymidine incorporation technique also demonstrated a transient inhibition of DNA synthesis in HeLa cells by cisplatin; such inhibition was greatly reduced in the resistant cells. These data argue for the hypothesis that the inhibition of DNA synthesis is important in determining cisplatin-induced cytotoxicity. In addition, the accumulation of cells at G0/G1 by serum starvation was not effective in the resistant cells compared to the parental cells, suggesting that the control of cell cycle exiting is also altered in the resistant cells. Taken together, these results support the notion that alterations in cell cycle control, in particular G2 arrest, are important in determining the sensitivity or resistance of mammalian cells to cisplatin and may have a role in clinical protocols.

Key Words

Cell cycle Cisplatin Drug resistance 

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Copyright information

© National Science Council 1994

Authors and Affiliations

  • Sue Lin-Chao
    • 1
  • Chuck C. K. Chao
    • 2
  1. 1.Institute of Molecular BiologyAcademia SinicaTaipei
  2. 2.Tumor Biology Laboratory Department of BiochemistryChang Gung Medical CollegeTaoyuanTaiwan (Republic of China)

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