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Simultaneous inhibition of ATM, ATR, and DNA-PK causes synergistic lethality

Takamitsu A Kato1, Junko Maeda1, Hiroya Watanabe2

  • 1Department of Environmental & Radiological Health Sciences, Colorado State University, Fort Collins, CO, 80523, USA.

Biochemical and Biophysical Research Communications
|August 15, 2024
PubMed

Insights

Simultaneously inhibiting ATM, ATR, and DNA-PK (PIKKs) causes synthetic lethality in mammalian cells. This triple inhibition severely disrupts DNA damage repair, offering a potential anticancer strategy.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA damage response (DDR) pathways are crucial for maintaining genomic stability.
  • PI3 kinase-like kinases (PIKKs) like ATM, ATR, and DNA-PK are key regulators of DDR.
  • Redundancy in PIKK function may limit the efficacy of single-target inhibitors.

Purpose of the Study:

  • To investigate the effects of simultaneous inhibition of ATM, ATR, and DNA-PK on mammalian cell viability.
  • To evaluate the combinatorial impact of triple PIKK inhibition on DNA damage response and chromosomal integrity.
  • To explore the potential of multi-targeted PIKK inhibition as an anticancer therapeutic strategy.

Main Methods:

  • Utilized Chinese hamster cell lines (CHO and V79) and their PIKK mutants.
  • Assessed cell viability, DNA damage response markers, and chromosomal aberrations.
  • Quantified synergistic lethality using synergy scores.

Main Results:

  • Single or dual PIKK inhibition showed increased cytotoxicity.
  • Simultaneous inhibition of all three PIKKs (ATM, ATR, DNA-PK) resulted in severe synthetic lethality.
  • Triple inhibition led to significantly higher synergistic lethality, chromosomal aberrations, and DNA double-strand break induction.

Conclusions:

  • ATM, ATR, and DNA-PK exhibit critical overlapping redundancy for cell survival.
  • Combined inhibition of these three PIKKs profoundly impairs DNA damage signaling and repair.
  • Multi-targeted DDR kinase inhibition presents a promising avenue for novel anticancer therapies.
Keywords:
ATMATRDNA-PKInhibitorSynthetic lethality

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