Autor(en): | Sargazi, Saman Saravani, Ramin Zavar Reza, Javad Jaliani, Hossein Zarei Mirinejad, Shekoufeh Rezaei, Zohreh Zarei, Sadegh |
Titel: | Induction of apoptosis and modulation of homologous recombination DNA repair pathway in prostate cancer cells by the combination of AZD2461 and valproic acid |
Sprache (ISO): | en |
Zusammenfassung: | Cancer therapies using defects in homologous recombination (HR) DNA repair pathway of tumor cells are not yet approved to be applicable in patients with malignancies other than BRCA1/2-mutated tumors. This study was designed to determine the efficacy of combination therapy of a histone deacetyl ase inhibitor, valproic acid (VPA) and a novel PARP inhibitor AZD2461 in both PC-3 (PTEN-mutated) and DU145 (PTEN-unmutated) prostate cancer cell lines. The Trypan blue dye exclusion assay an d the tetrazolium-based colorimetric (MTT) assay were performed to measure the cytotoxicity while combination effects were assessed based on Chou-Talalay's princi- ples. Flow-cytometric assay determined the type of cell deat h. The real-time PCR analysis was used to evaluate the alterations in mRNA levels of HR-related genes while their protein levels were measured using the ELISA method. γ -H2AX levels were determined as a marker of DNA damage. We observed a synergistic relationship between VPA and AZD2461 in all affected fractions of PC-3 cells (CI<0.9), but not in DU145 cells (CI>1.1). Annexin-V staining analysis revealed a significant induction of apoptosis when PC-3 cells were treated with VPA+AZD2461 ( p<0.05 ). Both mRNA and protein levels of Rad51 and Mre11 were significantly decreased in PC-3 cells co-treated with VPA+AZD2461 while enhanced H2AX phosphorylation was found in PC-3 cells after 12 and 24 hours of co-treatment ( p<0.05 ). Our findings established a preclinical rationale for selective targeting of HR repair pathways by a combination of VPA and AZD2461 as a mechanism for reducing the HR pathway sufficiency in PTEN -mutated prostate cancer cells. |
Schlagwörter: | AZD2461 Drug combination Prostate cancer PTEN Valproic acid |
URI: | http://hdl.handle.net/2003/38600 http://dx.doi.org/10.17877/DE290R-20519 |
Erscheinungsdatum: | 2019-07-08 |
Rechte (Link): | https://creativecommons.org/licenses/by/4.0/ |
Enthalten in den Sammlungen: | Original Articles |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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Sargazi_Saravani_08072019_proof.pdf | DNB | 786.09 kB | Adobe PDF | Öffnen/Anzeigen |
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