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Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer

  • Authors:
    • Yan Ma
    • Ping Chen
    • Jeanne A. Drisko
    • Dineo Khabele
    • Andrew K. Godwin
    • Qi Chen
  • View Affiliations / Copyright

    Affiliations: Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas, KS MS1017, USA, Department of Internal Medicine, University of Kansas Medical Center, Kansas, KS MS1017, USA, Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, University of Kansas Medical Center, Kansas, KS MS1017, USA, Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas, KS MS1017, USA
    Copyright: © Ma et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2629-2638
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    Published online on: January 31, 2020
       https://doi.org/10.3892/ol.2020.11364
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Abstract

The promise of poly(ADP‑ribose) polymerase inhibitors (PARPis) in the management of epithelial ovarian cancer (EOC) is hampered by the limited clinical activity against BRCA wild‑type or homologous recombination‑proficient EOC. In order to decrease the resistance and increase the efficacy of PARPis, combination treatments of pharmacological ascorbate and PARPis in preclinical BRCA wild‑type EOC models were investigated. The cytotoxicity of pharmacological ascorbate, olaparib and veliparib in a panel of BRCA1/2 wild‑type EOC cell lines were measured using MTT assays. Poly(ADP‑ribose) levels were quantified using chemiluminescent ELISA. The expression of proteins involved in DNA damage and DNA double‑strand breaks (DSBs) repair pathways were assessed by western blotting. The in vivo efficacy of pharmacological ascorbate, olaparib and their combination was evaluated in an intraperitoneal xenograft mouse model of BRCA1/2 wild‑type EOC. Pharmacological ascorbate induced H2O2‑dependent cytotoxicity in BRCA1/2 wild‑type EOC cells. SHIN3 and OVCAR5 cells were resistant to olaparib and veliparib treatment; however, the combination of ascorbate with olaparib or veliparib significantly enhanced cell death. Pharmacological ascorbate enhanced the effects olaparib or veliparib by downregulating the expression of BRCA1, BRCA2 and RAD51. Consequently, the combination of pharmacological ascorbate and olaparib potently enhanced DNA DSBs and significantly decreased tumor burden, ascites volume and the number of tumor cells in ascites in mice bearing BRCA1/2 wild‑type ovarian cancer xenografts. The combination of pharmacological ascorbate and PARPis may be a promising therapeutic approach worth clinical investigation in patients with BRCA wild‑type or PARPi‑resistant EOC.
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Copy and paste a formatted citation
Spandidos Publications style
Ma Y, Chen P, Drisko JA, Khabele D, Godwin AK and Chen Q: Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer. Oncol Lett 19: 2629-2638, 2020.
APA
Ma, Y., Chen, P., Drisko, J.A., Khabele, D., Godwin, A.K., & Chen, Q. (2020). Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer. Oncology Letters, 19, 2629-2638. https://doi.org/10.3892/ol.2020.11364
MLA
Ma, Y., Chen, P., Drisko, J. A., Khabele, D., Godwin, A. K., Chen, Q."Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer". Oncology Letters 19.4 (2020): 2629-2638.
Chicago
Ma, Y., Chen, P., Drisko, J. A., Khabele, D., Godwin, A. K., Chen, Q."Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer". Oncology Letters 19, no. 4 (2020): 2629-2638. https://doi.org/10.3892/ol.2020.11364
Copy and paste a formatted citation
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Spandidos Publications style
Ma Y, Chen P, Drisko JA, Khabele D, Godwin AK and Chen Q: Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer. Oncol Lett 19: 2629-2638, 2020.
APA
Ma, Y., Chen, P., Drisko, J.A., Khabele, D., Godwin, A.K., & Chen, Q. (2020). Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer. Oncology Letters, 19, 2629-2638. https://doi.org/10.3892/ol.2020.11364
MLA
Ma, Y., Chen, P., Drisko, J. A., Khabele, D., Godwin, A. K., Chen, Q."Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer". Oncology Letters 19.4 (2020): 2629-2638.
Chicago
Ma, Y., Chen, P., Drisko, J. A., Khabele, D., Godwin, A. K., Chen, Q."Pharmacological ascorbate induces ‘BRCAness’ and enhances the effects of Poly(ADP‑Ribose) polymerase inhibitors against BRCA1/2 wild‑type ovarian cancer". Oncology Letters 19, no. 4 (2020): 2629-2638. https://doi.org/10.3892/ol.2020.11364
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