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Breast Cancer Research and Treatment

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30.10.2023 | Preclinical study

Olaparib enhances sensitization of BRCA-proficient breast cancer cells to x-rays and protons

verfasst von: Sohee Park, Changhoon Choi, Haeyoung Kim, Yong Jae Shin, Yunjeong Oh, Won Park, Won Kyung Cho, Nalee Kim

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2024

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Abstract

Purpose

This study aimed to compare the radiosensitizing effect of the PARP inhibitor, Olaparib, between proton and X-rays irradiations in BRCA-proficient breast cancer (BC) cells.

Methods

Two BRCA-proficient BC cell lines, MDA-MB-231 and T47D BC, were used. Cell proliferation was assessed using the CCK-8 assay, and radiosensitivity was determined through the clonogenic survival assay. Flow cytometry was employed to analyze cell cycle distribution and apoptosis. The kinetics of DNA damage repair were evaluated using γH2AX immunofluorescence imaging and the comet assay. Tumor spheroid assays were conducted to test radiosensitivity in a three-dimensional culture condition.

Results

Olaparib sensitized both MDA-MB-231 and T47D cells to proton and X-ray irradiation in the clonogenic assay. MDA-MB-231 cells exhibited a higher dose enhancement factor for Olaparib than T47D cells. Olaparib increased radiation-induced G2/M cell cycle arrest and apoptosis specifically in MDA-MB-231 cells. γH2AX immunostaining and the comet assay showed Olaparib augmented radiation-induced DNA damage and apoptosis. The enhancement effect of Olaparib was more pronounced in proton irradiation than in X-ray irradiation, particularly in MDA-MB-231 cells than T47D cells. Both radiation and Olaparib dose-dependently inhibited spheroid growth in both cell lines. The synergy scores demonstrated that Olaparib interacted more strongly with protons than X-rays. The addition of an ATR inhibitor further enhanced Olaparib-induced proton radiosensitization in MDA-MB-231 cells.

Conclusion

This study found that Olaparib enhanced radiation efficacy in BRCA-proficient breast cancer cells, with a more pronounced effect observed with proton irradiation compared to X-ray irradiation. Combining Olaparib with an ATR inhibitor increased the radiosensitizing effect of protons.

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Titel: Olaparib enhances sensitization of BRCA-proficient breast cancer cells to x-rays and protons
verfasst von: Sohee Park
Changhoon Choi
Haeyoung Kim
Yong Jae Shin
Yunjeong Oh
Won Park
Won Kyung Cho
Nalee Kim
Publikationsdatum: 30.10.2023
Verlag: Springer US
Erschienen in: Breast Cancer Research and Treatment / Ausgabe 3/2024
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-023-07150-4

Springer Medizin

Olaparib enhances sensitization of BRCA-proficient breast cancer cells to x-rays and protons