Impact of DNA repair pathways on the cytotoxicity of piperlongumine in chicken DT40 cell-lines

Saki Okamoto, Takeo Narita, Hiroyuki Sasanuma, Shunichi Takeda, Shin Ichiro Masunaga, Tadayoshi Bessho, Keizo Tano

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Piperlongumine is a naturally-occurring small molecule with various biological activities. Recent studies demonstrate that piperlongumine selectively kills various types of transformed cells with minimal toxicity to non-transformed cells by inducing a high level of reactive oxygen species (ROS). ROS generates various types of DNA lesions, including base modifications and single strand breaks. In order to examine the contribution of ROS-induced DNA damage to the cytotoxicity by piperlongumine, various DNA repair-deficient chicken DT40 cell-lines with a single DNA repair gene deletion were tested for cellular sensitivity to piperlongumine. The results showed that cell lines defective in homologous recombination (HR) display hyper-sensitivity to piperlongumine, while other cell lines with a deficiency in non-homologous end joining (NHEJ), base excision repair (BER), nucleotide excision repair (NER), Fanconi anemia (FA) pathway, or translesion DNA synthesis (TLS) polymerases, show no sensitivity to piperlongumine. The results strongly implicate that double strand breaks (DSBs) generated by piperlongumine are major cytotoxic DNA lesions. Furthermore, a deletion of 53BP1 or Ku70 in the BRCA1-deficient cell line restored cellular resistance to piperlongumine. This strongly supports the idea that piperlongumine induces DSBmediated cell death. Interestingly, piperlongumine makes the wild type DT40 cell line hypersensitive to a PARP-inhibitor, Olaparib. The results implicate that piperlongumine inhibits HR. Further analysis with cell-based HR assay and the kinetic study of Rad51 foci formation confirmed that piperlongumine suppresses HR activity. Altogether, we revealed novel mechanisms of piperlongumine-induced cytotoxicity

Original languageEnglish (US)
Pages (from-to)285-292
Number of pages8
JournalGenes and Cancer
Volume5
Issue number7-8
StatePublished - 2014

Keywords

  • BRCA1
  • BRCA2
  • Chemotherapy
  • Homologous recombination
  • Oxidative stress
  • Piperlongumine

ASJC Scopus subject areas

  • Genetics
  • Cancer Research

Fingerprint Dive into the research topics of 'Impact of DNA repair pathways on the cytotoxicity of piperlongumine in chicken DT40 cell-lines'. Together they form a unique fingerprint.

  • Cite this

    Okamoto, S., Narita, T., Sasanuma, H., Takeda, S., Masunaga, S. I., Bessho, T., & Tano, K. (2014). Impact of DNA repair pathways on the cytotoxicity of piperlongumine in chicken DT40 cell-lines. Genes and Cancer, 5(7-8), 285-292.