QS-ZYX-1-61 induces apoptosis through topoisomerase II in human non-small-cell lung cancer A549 cells

Mei Chuan Chen, Shiow Lin Pan, Qian Shi, Zhiyan Xiao, Kuo Hsiung Lee, Tsai Kun Li, Che Ming Teng

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Agents that cause DNA damage have been widely used as anticancer drugs because DNA lesions can initiate DNA checkpoints that induce cell death. The results presented here indicate that QS-ZYX-1-61, a derivative of VP-16, was significantly more potent than VP-16 in suppressing the viability of A549 cells. Treatment of cells with QS-ZYX-1-61 led to a DNA damage response and a dramatic increase of apoptosis. Our results also suggest that QS-ZYX-1-61 may be a topoisomerase (topo) II targeting agent, as evidenced by relaxation assay and induction of reversible cleavable complexes. Moreover, blocking of p53, topo IIα, and topo IIβ greatly protected against caspase-3 activation, poly-ADP-ribose polymerase cleavage, and cell growth inhibition, indicating that QS-ZYX-1-61 acts through these proteins. These results support our conclusion that QS-ZYX-1-61has potential as an anticancer agent because it causes accumulation of DNA cleavable complexes, with downstream consequences that include double-strand breaks and DNA damage response signaling for apoptosis. Taken together, our results indicate that QS-ZYX-1-61 is a novel DNA damaging agent and displays an outstanding activity that could be worthy of further investigation.

Original languageEnglish
Pages (from-to)80-87
Number of pages8
JournalCancer Science
Issue number1
Publication statusPublished - Jan 2012

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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