Cited by 5,198PARP inhibition in cancer therapyDNA Repair MechanismsBRCA gene mutations in cancer

Specific killing of BRCA2-deficient tumours with inhibitors of poly(ADP-ribose) polymerase

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Bryant, Helen E., Schultz, Niklas, Thomas, Huw D., Parker, Kayan M., Flower, Dan, Lopez, Elena, Kyle, Suzanne, Meuth, Mark +2 more·2005·Nature

Abstract

Poly(ADP-ribose) polymerase (PARP1) facilitates DNA repair by binding to DNA breaks and attracting DNA repair proteins to the site of damage. Nevertheless, PARP1-/- mice are viable, fertile and do not develop early onset tumours. Here, we show that PARP inhibitors trigger gamma-H2AX and RAD51 foci formation. We propose that, in the absence of PARP1, spontaneous single-strand breaks collapse replication forks and trigger homologous recombination for repair. Furthermore, we show that BRCA2-deficient cells, as a result of their deficiency in homologous recombination, are acutely sensitive to PARP inhibitors, presumably because resultant collapsed replication forks are no longer repaired. Thus, PARP1 activity is essential in homologous recombination-deficient BRCA2 mutant cells. We exploit this requirement in order to kill BRCA2-deficient tumours by PARP inhibition alone. Treatment with PARP inhibitors is likely to be highly tumour specific, because only the tumours (which are BRCA2-/-) in BRCA2+/- patients are defective in homologous recombination. The use of an inhibitor of a DNA repair enzyme alone to selectively kill a tumour, in the absence of an exogenous DNA-damaging agent, represents a new concept in cancer treatment.

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Crossref · 10.1038/nature03443

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  • BRCA-mutated cancer cells are selectively sensitive to agents that require homologous recombination repair, such as PARP1 inhibitors.

    “Thus, BRCA-mutated cancer cells are selectively sensitive to agents that require repair of double-strand breaks by homologous recombination, such as PARP1 inhibitors [5–7].”
  • Synthetic lethal interactions can be harnessed to identify new antibiotic or cancer therapeutic targets.

    “Synthetic lethal interactions are of particular interest as they can be harnessed to identify new antibiotic or cancer therapeutic targets (6, 7).”

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Authors
Bryant, H. E., Schultz, N., Thomas, H. D., Parker, K. M., Flower, D., Lopez, E., Kyle, S., Meuth, M., Curtin, N. J., & Helleday, T.
Affiliations
  • University of Sheffield (GB)
  • Stockholm University (SE)
  • Newcastle University (GB)
Corresponding author
Helleday, Thomas
Venue
Nature
Published
2005-04-14
Volume
434
Issue
7035
Pages
913-917
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2009007206
Cited by
5,198
References
26
Citations by year
2026: 213 · 2025: 256 · 2024: 286 · 2023: 355 · 2022: 355 · 2021: 396 · 2020: 388 · 2019: 282 · 2018: 290 · 2017: 273 · 2016: 265 · 2015: 230 · 2014: 243 · 2013: 223 · 2012: 213
FWCI
56.59
Type
journal article
Language
en
Update notices
erratum (2007-05-17)
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
National Cancer Institute (F31CA260794)
Topics
  • Health Sciences › Medicine › Oncology › PARP inhibition in cancer therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › BRCA gene mutations in cancer
Keywords
PARP inhibitors, BRCA2 deficiency, homologous recombination, synthetic lethality, breast cancer, PARP1, DNA repair, replication fork collapse, single-strand breaks, γH2AX foci, RAD51 foci, base excision repair
MeSH terms
Poly(ADP-ribose) Polymerase Inhibitors, Animals, Antineoplastic Agents, Benzodiazepines, DNA Damage, DNA Repair, DNA Replication, Mice, Nude, Neoplasms, Poly(ADP-ribose) Polymerases, Xenograft Model Antitumor Assays, Genes, BRCA2, BRCA2 Protein, Cell Line, Tumor, Mice, Azulenes

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