NSCLC cells demonstrate differential mode of cell death in response to the combined treatment of radiation and a DNAPKcs inhibitor

Lan Yu, Zeng Fu Shang, Feng Ming Hsu, Zhang Zhang, Vasu Tumati, Yu Fen Lin, Benjamin P C Chen, Debabrata Saha

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The current standard of care for lung cancer consists of concurrent chemotherapy and radiation. Several studies have shown that the DNA-PKcs inhibitor NU7441 is a highly potent radiosensitizer, however, the mechanism of NU7441's anti-proliferation effect has not been fully elucidated. In this study, the combined effect of NU7441 and ionizing radiation (IR) in a panel of non-small cell lung cancer cell lines (A549, H460 and H1299) has been investigated. We found that NU7441 significantly enhances the effect of IR in all cell lines. The notable findings in response to this combined treatment are (i) prolonged delay in IR-induced DNA DSB repair, (ii) induced robust G2/M checkpoint, (iii) increased aberrant mitosis followed by mitotic catastrophe specifically in H1299, (iv) dramatically induced autophagy in A549 and (v) IR-induced senescence specifically in H460. H1299 cells show greater G2 checkpoint adaptation after combined treatment, which can be attributed to higher expression level of Plk1 compared to A549 and H460. The enhanced autophagy after NU7441 treatment in A549 is possibly due to the higher endogenous expression of pS6K compared to H1299 and H460 cells. In conclusion, choice of cell death pathway is dependent on the mutation status and other genetic factors of the cells treated.

Original languageEnglish (US)
Pages (from-to)3848-3860
Number of pages13
JournalOncotarget
Volume6
Issue number6
StatePublished - 2015

Fingerprint

Ionizing Radiation
Cell Death
Radiation
Autophagy
Therapeutics
Standard of Care
Mitosis
Non-Small Cell Lung Carcinoma
DNA Repair
Lung Neoplasms
8-dibenzothiophen-4-yl-2-morpholin-4-yl-chromen-4-one
Drug Therapy
Cell Line
Mutation
DNA

Keywords

  • Apoptosis
  • Autophagy
  • Mitotic Catastrophe
  • Radiosensitizer
  • Senescence

ASJC Scopus subject areas

  • Oncology

Cite this

NSCLC cells demonstrate differential mode of cell death in response to the combined treatment of radiation and a DNAPKcs inhibitor. / Yu, Lan; Shang, Zeng Fu; Hsu, Feng Ming; Zhang, Zhang; Tumati, Vasu; Lin, Yu Fen; Chen, Benjamin P C; Saha, Debabrata.

In: Oncotarget, Vol. 6, No. 6, 2015, p. 3848-3860.

Research output: Contribution to journalArticle

Yu, Lan ; Shang, Zeng Fu ; Hsu, Feng Ming ; Zhang, Zhang ; Tumati, Vasu ; Lin, Yu Fen ; Chen, Benjamin P C ; Saha, Debabrata. / NSCLC cells demonstrate differential mode of cell death in response to the combined treatment of radiation and a DNAPKcs inhibitor. In: Oncotarget. 2015 ; Vol. 6, No. 6. pp. 3848-3860.
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