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Published in: Journal of Cancer Research and Clinical Oncology 3/2020

01-03-2020 | NSCLC | Original Article – Clinical Oncology

Fluzoparib increases radiation sensitivity of non-small cell lung cancer (NSCLC) cells without BRCA1/2 mutation, a novel PARP1 inhibitor undergoing clinical trials

Authors: Jing Luo, Xinchi Dai, Hua Hu, Jie Chen, Lujun Zhao, Changyong Yang, Jifeng Sun, Lianmin Zhang, Qian Wang, Shilei Xu, Yue Xu, Ningbo Liu, Guoguang Ying, Ping Wang

Published in: Journal of Cancer Research and Clinical Oncology | Issue 3/2020

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Abstract

Propose

Poly (ADP-ribose) polymerase 1 inhibitors were originally investigated as anti-cancer therapeutics with BRCA1/2 genes mutation. Here, we investigate the effectiveness of a novel PARP1 inhibitor fluzoparib, for enhancing the radiation sensitivity of NSCLC cells lacking BRCA1/2 mutation.

Methods

We used MTS assays, western blotting, colony formation assays, immunofluorescence staining, and flow cytometry to evaluate the radiosensitization of NSCLC cells to fluzoparib and explore the underlying mechanisms in vitro. Through BRCA1 and RAD50 genes knockdown, we established dysfunctional homologous recombination (HR) DNA repair pathway models in NSCLC cells. We next investigated the radiosensitization effect of fluzoparib in vivo using human NSCLC xenograft models in mice. The expression of PARP1 and BRCA1 in human NSCLC tumor samples was measured by immunohistochemistry. Furthermore, we sequenced HR-related gene mutations and analyzed their frequencies in advanced NSCLC.

Results

In vitro experiments in NSCLC cell lines along with in vivo experiments using an NSCLC xenograft mouse model demonstrated the radiosensitization effect of fluzoparib. The underlying mechanisms involved increased apoptosis, cell-cycle arrest, enhanced irradiation-induced DNA damage, and delayed DNA-damage repair. Immunohistochemical staining showed no correlation between the expression of PARP1 and BRCA1. Moreover, our sequencing results revealed high mutation frequencies for the BRCA1/2, CHEK2, ATR, and RAD50 genes.

Conclusion

The potential therapeutic value of fluzoparib for increasing the radiation sensitivity of NSCLC is well confirmed. Moreover, our findings of high mutation frequencies among HR genes suggest that PARP1 inhibition may be an effective treatment strategy for advanced non-small cell lung cancer patients.
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Literature
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go back to reference Tyldesley S, Boyd C, Schulze K, Walker H, Mackillop WJ (2001) Estimating the need for radiotherapy for lung cancer: an evidence-based, epidemiologic approach. Int J Radiat Oncol Biol Phys 49:973–985CrossRef Tyldesley S, Boyd C, Schulze K, Walker H, Mackillop WJ (2001) Estimating the need for radiotherapy for lung cancer: an evidence-based, epidemiologic approach. Int J Radiat Oncol Biol Phys 49:973–985CrossRef
Metadata
Title
Fluzoparib increases radiation sensitivity of non-small cell lung cancer (NSCLC) cells without BRCA1/2 mutation, a novel PARP1 inhibitor undergoing clinical trials
Authors
Jing Luo
Xinchi Dai
Hua Hu
Jie Chen
Lujun Zhao
Changyong Yang
Jifeng Sun
Lianmin Zhang
Qian Wang
Shilei Xu
Yue Xu
Ningbo Liu
Guoguang Ying
Ping Wang
Publication date
01-03-2020
Publisher
Springer Berlin Heidelberg
Published in
Journal of Cancer Research and Clinical Oncology / Issue 3/2020
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-019-03097-6

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