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Radiosensitization Effect of PARP Inhibitor Talazoparib Involves Decreasing Mitochondrial Membrane Potential and

Barkha Saraswat1, Ankitha Vadi Velu1, Zhongming Gao1

  • 1Department of Molecular and Genomic Biomedicine, Center for Bioinformatics and Molecular Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-12-4, Sakamoto, Nagasaki 852-8523, Japan.

Current Issues in Molecular Biology
|November 26, 2025
PubMed

Insights

Poly (ADP-ribose) polymerase inhibitors enhance cancer cell sensitivity to radiation therapy. Talazoparib combined with radiation induces senescence in lung cancer cells, involving p21.

Area of Science:

  • Oncology
  • Molecular Biology
  • Radiotherapy

Background:

  • Poly (ADP-ribose) polymerase inhibitors (PARPis) target DNA repair pathways.
  • PARPis combined with radiation therapy show potential for cancer treatment.

Purpose of the Study:

  • To compare the radiosensitization effects of various PARPis in lung cancer cells.
  • To investigate the mechanism of talazoparib-induced radiosensitization.

Main Methods:

  • Comparison of clinically used PARPis in A549 lung cancer cells.
  • Assessment of radiosensitization using ER10 values.
  • Analysis of cellular senescence, mitochondrial membrane potential, and p21 gene expression.

Main Results:

  • Most tested PARPis demonstrated radiosensitization effects.
  • Talazoparib exhibited radiosensitization at the lowest concentration.
  • Combination of talazoparib and gamma-irradiation increased cellular senescence and decreased mitochondrial membrane potential, dependent on p21.

Conclusions:

  • Talazoparib is a potent PARP inhibitor with significant radiosensitization effects.
  • Talazoparib combined with radiation induces p21-dependent cellular senescence in lung cancer cells.
Keywords:
PARPisradiosensitizationsenescencetalazoparibγ-irradiation

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