Abstract
Purpose
The ERCC1–XPF 5′–3′ DNA endonuclease complex is involved in the nucleotide excision repair pathway and in the DNA inter-strand crosslink repair pathway, two key mechanisms modulating the activity of chemotherapeutic alkylating agents in cancer cells. Inhibitors of the interaction between ERCC1 and XPF can be used to sensitize cancer cells to such drugs.
Methods
We tested recently synthesized new generation inhibitors of this interaction and evaluated their capacity to sensitize cancer cells to the genotoxic activity of agents in synergy studies, as well as their capacity to inhibit the protein–protein interaction in cancer cells using proximity ligation assay.
Results
Compound B9 showed the best activity being synergistic with cisplatin and mitomycin C in both colon and lung cancer cells. Also, B9 abolished the interaction between ERCC1 and XPF in cancer cells as shown by proximity ligation assay. Results of different compounds correlated with values from our previously obtained in silico predictions.
Conclusion
Our results confirm the feasibility of the approach of targeting the protein–protein interaction between ERCC1 and XPF to sensitize cancer cells to alkylating agents, thanks to the improved binding affinity of the newly synthesized compounds.
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Acknowledgements
This research was partly supported by funds from the Alberta Cancer Foundation. FG was supported by an Alberta Innovates scholarship and a Novartis Pharmaceuticals Canada Inc. scholarship. LPJ received funding from Olav Raagholt og Gerd Meidel Raagholts stiftelse for forskning. The authors are grateful to Bruno Chapuis and Denis Ressnikoff at CIQLE, Lyon for valuable assistance in image acquisition and analysis.
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Ciniero, G., Elmenoufy, A.H., Gentile, F. et al. Enhancing the activity of platinum-based drugs by improved inhibitors of ERCC1–XPF-mediated DNA repair. Cancer Chemother Pharmacol 87, 259–267 (2021). https://doi.org/10.1007/s00280-020-04213-x
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DOI: https://doi.org/10.1007/s00280-020-04213-x