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Lesueur P, Chevalier F, El-Habr EA, Junier MP, Chneiweiss H, Castera L, Müller E, Stefan D, Saintigny Y. Radiosensitization Effect of Talazoparib, a Parp Inhibitor, on Glioblastoma Stem Cells Exposed to Low and High Linear Energy Transfer Radiation. Sci Rep 2018; 8:3664. [PMID: 29483558 PMCID: PMC5826933 DOI: 10.1038/s41598-018-22022-4] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 02/15/2018] [Indexed: 11/09/2022] Open
Abstract
Despite continuous improvements in treatment of glioblastoma, tumor recurrence and therapy resistance still occur in a high proportion of patients. One underlying reason for this radioresistance might be the presence of glioblastoma cancer stem cells (GSCs), which feature high DNA repair capability. PARP protein plays an important cellular role by detecting the presence of damaged DNA and then activating signaling pathways that promote appropriate cellular responses. Thus, PARP inhibitors (PARPi) have recently emerged as potential radiosensitizing agents. In this study, we investigated the preclinical efficacy of talazoparib, a new PARPi, in association with low and high linear energy transfer (LET) irradiation in two GSC cell lines. Reduction of GSC fraction, impact on cell proliferation, and cell cycle arrest were evaluated for each condition. All combinations were compared with a reference schedule: photonic irradiation combined with temozolomide. The use of PARPi combined with photon beam and even more carbon beam irradiation drastically reduced the GSC frequency of GBM cell lines in vitro. Furthermore, talazoparib combined with irradiation induced a marked and prolonged G2/M block, and decreased proliferation. These results show that talazoparib is a new candidate that effects radiosensitization in radioresistant GSCs, and its combination with high LET irradiation, is promising.
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Affiliation(s)
- Paul Lesueur
- LARIA, iRCM, François Jacob Institute, DRF-CEA, Caen, France.
- UMR6252 CIMAP, CEA - CNRS - ENSICAEN - Université de Caen Normandie, Caen, France.
- Radiotherapy Department, Centre François Baclesse, Caen, France.
| | - François Chevalier
- LARIA, iRCM, François Jacob Institute, DRF-CEA, Caen, France
- UMR6252 CIMAP, CEA - CNRS - ENSICAEN - Université de Caen Normandie, Caen, France
| | - Elias A El-Habr
- CNRS UMR8246, Inserm U1130, UPMC, Neuroscience Seine-IBPS, Sorbonne Universities, 75005, Paris, France
| | - Marie-Pierre Junier
- CNRS UMR8246, Inserm U1130, UPMC, Neuroscience Seine-IBPS, Sorbonne Universities, 75005, Paris, France
| | - Hervé Chneiweiss
- CNRS UMR8246, Inserm U1130, UPMC, Neuroscience Seine-IBPS, Sorbonne Universities, 75005, Paris, France
| | - Laurent Castera
- Plateforme de sequencage haut debit, Centre François Baclesse, Caen, France
| | - Etienne Müller
- Plateforme de sequencage haut debit, Centre François Baclesse, Caen, France
| | - Dinu Stefan
- Radiotherapy Department, Centre François Baclesse, Caen, France
| | - Yannick Saintigny
- LARIA, iRCM, François Jacob Institute, DRF-CEA, Caen, France
- UMR6252 CIMAP, CEA - CNRS - ENSICAEN - Université de Caen Normandie, Caen, France
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