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Robeska E, Lalanne K, Vianna F, Sutcu HH, Khobta A, Busso D, Radicella JP, Campalans A, Baldeyron C. Targeted nuclear irradiation with a proton microbeam induces oxidative DNA base damage and triggers the recruitment of DNA glycosylases OGG1 and NTH1. DNA Repair (Amst) 2024; 133:103610. [PMID: 38101146 DOI: 10.1016/j.dnarep.2023.103610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 11/10/2023] [Accepted: 11/30/2023] [Indexed: 12/17/2023]
Abstract
DNA is the major target of radiation therapy of malignant tumors. Ionizing radiation (IR) induces a variety of DNA lesions, including chemically modified bases and strand breaks. The use of proton beam therapy for cancer treatment is ramping up, as it is expected to reduce normal tissue damage. Thus, it is important to understand the molecular mechanisms of recognition, signaling, and repair of DNA damage induced by protons in the perspective of assessing not only the risk associated with human exposure to IR but also the possibility to improve the efficacy of therapy. Here, we used targeted irradiation of nuclear regions of living cells with controlled number of protons at a high spatio-temporal resolution to detect the induced base lesions and characterize the recruitment kinetics of the specific DNA glycosylases to DNA damage sites. We show that localized irradiation with 4 MeV protons induces, in addition to DNA double strand breaks (DSBs), the oxidized bases 7,8-dihydro-8-oxoguanine (8-oxoG) and thymine glycol (TG) at the site of irradiation. Consistently, the DNA glycosylases OGG1 and NTH1, capable of excising 8-oxoG and TG, respectively, and initiating the base excision repair (BER) pathway, are recruited to the site of damage. To our knowledge, this is the first direct evidence indicating that proton microbeams induce oxidative base damage, and thus implicating BER in the repair of DNA lesions induced by protons.
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Affiliation(s)
- Elena Robeska
- Université Paris-Saclay, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France; Université Paris Cité, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France
| | - Kévin Lalanne
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SDOS/LMDN, Cadarache, F-13115 Saint-Paul-Lez-Durance, France
| | - François Vianna
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SDOS/LMDN, Cadarache, F-13115 Saint-Paul-Lez-Durance, France
| | - Haser Hasan Sutcu
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SERAMED/LRAcc, F-92262 Fontenay aux Roses, France
| | - Andriy Khobta
- Institute of Nutritional Sciences, Friedrich Schiller University Jena, 07743 Jena, Germany
| | - Didier Busso
- Université Paris Cité et Université Paris-Saclay, INSERM, CEA, iRCM/IBFJ, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France
| | - J Pablo Radicella
- Université Paris-Saclay, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France; Université Paris Cité, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France
| | - Anna Campalans
- Université Paris-Saclay, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France; Université Paris Cité, iRCM/IBFJ, CEA, Genetic Stability, Stem Cells and Radiation, F-92260 Fontenay-aux-Roses, France.
| | - Céline Baldeyron
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SERAMED/LRAcc, F-92262 Fontenay aux Roses, France.
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Sleiman A, Lalanne K, Vianna F, Perrot Y, Richaud M, SenGupta T, Cardot-Martin M, Pedini P, Picard C, Nilsen H, Galas S, Adam-Guillermin C. Targeted Central Nervous System Irradiation with Proton Microbeam Induces Mitochondrial Changes in Caenorhabditis elegans. Biology (Basel) 2023; 12:839. [PMID: 37372124 DOI: 10.3390/biology12060839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 06/29/2023]
Abstract
Fifty percent of all patients with cancer worldwide require radiotherapy. In the case of brain tumors, despite the improvement in the precision of radiation delivery with proton therapy, studies have shown structural and functional changes in the brains of treated patients with protons. The molecular pathways involved in generating these effects are not completely understood. In this context, we analyzed the impact of proton exposure in the central nervous system area of Caenorhabditis elegans with a focus on mitochondrial function, which is potentially implicated in the occurrence of radiation-induced damage. To achieve this objective, the nematode C. elegans were micro-irradiated with 220 Gy of protons (4 MeV) in the nerve ring (head region) using the proton microbeam, MIRCOM. Our results show that protons induce mitochondrial dysfunction, characterized by an immediate dose-dependent loss of the mitochondrial membrane potential (ΔΨm) associated with oxidative stress 24 h after irradiation, which is itself characterized by the induction of the antioxidant proteins in the targeted region, observed using SOD-1::GFP and SOD-3::GFP strains. Moreover, we demonstrated a two-fold increase in the mtDNA copy number in the targeted region 24 h after irradiation. In addition, using the GFP::LGG-1 strain, an induction of autophagy in the irradiated region was observed 6 h following the irradiation, which is associated with the up-regulation of the gene expression of pink-1 (PTEN-induced kinase) and pdr-1 (C. elegans parkin homolog). Furthermore, our data showed that micro-irradiation of the nerve ring region did not impact the whole-body oxygen consumption 24 h following the irradiation. These results indicate a global mitochondrial dysfunction in the irradiated region following proton exposure. This provides a better understanding of the molecular pathways involved in radiation-induced side effects and may help in finding new therapies.
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Affiliation(s)
- Ahmad Sleiman
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LMDN, Cadarache, 13115 Saint-Paul-lez-Durance, France
| | - Kévin Lalanne
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LMDN, Cadarache, 13115 Saint-Paul-lez-Durance, France
| | - François Vianna
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LMDN, Cadarache, 13115 Saint-Paul-lez-Durance, France
| | - Yann Perrot
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LDRI, 92262 Fontenay-aux-Roses, France
| | - Myriam Richaud
- IBMM, University of Montpellier, CNRS, ENSCM, 34093 Montpellier, France
| | - Tanima SenGupta
- Section of Clinical Molecular Biology (EpiGen), Akershus University Hospital, 1478 Lørenskog, Norway
| | - Mikaël Cardot-Martin
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LMDN, Cadarache, 13115 Saint-Paul-lez-Durance, France
| | - Pascal Pedini
- Aix Marseille University, CNRS, EFS, ADES, 13288 Marseille, France
| | | | - Hilde Nilsen
- Section of Clinical Molecular Biology (EpiGen), Akershus University Hospital, 1478 Lørenskog, Norway
- Department of Microbiology, Oslo University Hospital, 0372 Oslo, Norway
| | - Simon Galas
- IBMM, University of Montpellier, CNRS, ENSCM, 34093 Montpellier, France
| | - Christelle Adam-Guillermin
- Institut de Radioprotection et de Sûreté Nucléaire, IRSN, PSE-SANTE/SDOS/LMDN, Cadarache, 13115 Saint-Paul-lez-Durance, France
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