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Gobet F, Barberet P, Delville MH, Devès G, Guérin T, Liénard R, Tran HN, Vecco-Garda C, Würger A, Zein S, Seznec H. Electric Fields in Liquid Water Irradiated with Protons at Ultrahigh Dose Rates. Phys Rev Lett 2023; 131:178001. [PMID: 37955497 DOI: 10.1103/physrevlett.131.178001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 09/21/2023] [Indexed: 11/14/2023]
Abstract
We study the effects of irradiating water with 3 MeV protons at high doses by observing the motion of charged polystyrene beads outside the proton beam. By single-particle tracking, we measure a radial velocity of the order of microns per second. Combining electrokinetic theory with simulations of the beam-generated reaction products and their outward diffusion, we find that the bead motion is due to electrophoresis in the electric field induced by the mobility contrast of cations and anions. This work sheds light on the perturbation of biological systems by high-dose radiations and paves the way for the manipulation of colloid or macromolecular dispersions by radiation-induced diffusiophoresis.
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Affiliation(s)
- F Gobet
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - P Barberet
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - M-H Delville
- University of Bordeaux, CNRS, ICMCB, UMR 5026, F-33608 Pessac, France
| | - G Devès
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - T Guérin
- University of Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - R Liénard
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - H N Tran
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - C Vecco-Garda
- University of Bordeaux, CNRS, ICMCB, UMR 5026, F-33608 Pessac, France
| | - A Würger
- University of Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France
| | - S Zein
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
| | - H Seznec
- University of Bordeaux, CNRS, LP2I, UMR 5797, F-33170 Gradignan, France
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Atallah V, Lagarde P, Barberet P, Muggiolu G, Sargos P, Antoine M, Kantor G, Seznec H, Chibon F. Étude des profils génomiques et chromosomiques en réponse à une irradiation : observation d’un phénomène de polyploïdisation cellulaire. Cancer Radiother 2015. [DOI: 10.1016/j.canrad.2015.07.081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
Charged-particle microbeams (CPMs) allow the targeting of sub-cellular compartments with a counted number of energetic ions. While initially developed in the late 1990s to overcome the statistical fluctuation on the number of traversals per cell inevitably associated with broad beam irradiations, CPMs have generated a growing interest and are now used in a wide range of radiation biology studies. Besides the study of the low-dose cellular response that has prevailed in the applications of these facilities for many years, several new topics have appeared recently. By combining their ability to generate highly clustered damages in a micrometric volume with immunostaining or live-cell GFP labelling, a huge potential for monitoring radiation-induced DNA damage and repair has been introduced. This type of studies has pushed end-stations towards advanced fluorescence microscopy techniques, and several microbeam lines are currently equipped with the state-of-the-art time-lapse fluorescence imaging microscopes. In addition, CPMs are nowadays also used to irradiate multicellular models in a highly controlled way. This review presents the latest developments and applications of charged-particle microbeams to radiation biology.
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Affiliation(s)
- P Barberet
- University of Bordeaux, CENBG, UMR 5797, Gradignan F-33170, France CNRS, IN2P3, CENBG, UMR 5797, Gradignan F-33170, France
| | - H Seznec
- University of Bordeaux, CENBG, UMR 5797, Gradignan F-33170, France CNRS, IN2P3, CENBG, UMR 5797, Gradignan F-33170, France
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Barberet P, Vianna F, Karamitros M, Brun T, Gordillo N, Moretto P, Incerti S, Seznec H. Monte-Carlo dosimetry on a realistic cell monolayer geometry exposed to alpha particles. Phys Med Biol 2012; 57:2189-207. [DOI: 10.1088/0031-9155/57/8/2189] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Incerti S, Seznec H, Simon M, Barberet P, Habchi C, Moretto P. Monte Carlo dosimetry for targeted irradiation of individual cells using a microbeam facility. Radiat Prot Dosimetry 2009; 133:2-11. [PMID: 19174380 DOI: 10.1093/rpd/ncp003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Microbeam facilities provide a unique opportunity to investigate the effects of ionising radiation on living biological cells with a precise control of the delivered dose. This paper describes dosimetry calculations performed at the single-cell level in the microbeam irradiation facility available at the Centre d'Etudes Nucléaires de Bordeaux-Gradignan in France, using the object-oriented Geant4 Monte Carlo simulation toolkit. The cell geometry model is based on high-resolution three-dimensional voxelised phantoms of a human keratinocyte (HaCaT) cell line. Such phantoms are built from confocal microscopy imaging and from ion beam chemical elemental analysis. Results are presented for single-cell irradiation with 3 MeV incident alpha particles.
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Affiliation(s)
- S Incerti
- CNRS/IN2P3, Centre d'Etudes Nucléaires de Bordeaux-Gradignan, UMR 5797, Gradignan F-33175, France.
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Bresson C, Lamouroux C, Sandre C, Tabarant M, Gault N, Poncy JL, Lefaix JL, Den Auwer C, Spezia R, Gaigeot MP, Ansoborlo E, Mounicou S, Fraysse A, Deves G, Bacquart T, Seznec H, Pouthier T, Moretto P, Ortega R, Lobinski R, Moulin C. An interdisciplinary approach to investigate the impact of cobalt in a human keratinocyte cell line. Biochimie 2006; 88:1619-29. [PMID: 17007991 DOI: 10.1016/j.biochi.2006.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Accepted: 09/04/2006] [Indexed: 11/15/2022]
Abstract
Since in nuclear power plants, risks of skin contact contamination by radiocobalt are significant, we focused on the impact of cobalt on a human cutaneous cell line, i.e. HaCaT keratinocytes. The present paper reports an interdisciplinary approach aimed at clarifying the biochemical mechanisms of metabolism and toxicity of cobalt in HaCaT cells. Firstly, a brief overview of the used instrumental techniques is reported. The following parts present description and discussion of results concerning: (i) toxicological studies concerning cobalt impact towards HaCaT cells (ii) structural and speciation fundamental studies of cobalt-bioligand systems, through X-ray absorption spectroscopy (XAS), ab initio and thermodynamic modelling (iii) preliminary results regarding intracellular cobalt speciation in HaCaT cells using size exclusion chromatography/inductively coupled plasma-atomic emission spectroscopy (SEC/ICP-AES) and direct in situ analysis by ion beam micropobe analytical techniques.
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Affiliation(s)
- C Bresson
- DEN/DANS/DPC/SECR/LSRM, CEA Saclay, Batiment 391, 91191 Gif-sur-Yvette, France
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Incerti S, Gault N, Habchi C, Lefaix JL, Moretto P, Poncy JL, Pouthier T, Seznec H. A comparison of cellular irradiation techniques with alpha particles using the Geant4 Monte Carlo simulation toolkit. Radiat Prot Dosimetry 2006; 122:327-9. [PMID: 17132663 DOI: 10.1093/rpd/ncl422] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A comparison of three cellular irradiation techniques using the Monte Carlo simulation toolkit Geant4 is presented in this paper. They involve electrodeposited source of alpha particle-emitting radionuclides, random classical alpha beam irradiation and single cell targeted irradiation using a focused alpha microbeam line. The simulation allows the calculation of hit distributions among the cellular population as well as the absorbed dose for two typical cellular geometries.
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Affiliation(s)
- S Incerti
- Centre d'Etudes Nucléaires de Bordeaux-Gradignan, CNRS/IN2P3, Université Bordeaux 1, Le Haut Vigneau, Gradignan cedex, France.
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Seznec H, Agbulut O, Sergeant N, Savouret C, Ghestem A, Tabti N, Willer JC, Ourth L, Duros C, Brisson E, Fouquet C, Butler-Browne G, Delacourte A, Junien C, Gourdon G. Mice transgenic for the human myotonic dystrophy region with expanded CTG repeats display muscular and brain abnormalities. Hum Mol Genet 2001; 10:2717-26. [PMID: 11726559 DOI: 10.1093/hmg/10.23.2717] [Citation(s) in RCA: 179] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The autosomal dominant mutation causing myotonic dystrophy (DM1) is a CTG repeat expansion in the 3'-UTR of the DM protein kinase (DMPK) gene. This multisystemic disorder includes myotonia, progressive weakness and wasting of skeletal muscle and extramuscular symptoms such as cataracts, testicular atrophy, endocrine and cognitive dysfunction. The mechanisms underlying its pathogenesis are complex. Recent reports have revealed that DMPK gene haploinsufficiency may account for cardiac conduction defects whereas cataracts may be due to haploinsufficiency of the neighboring gene, the DM-associated homeobox protein (DMAHP or SIX5) gene. Furthermore, mice expressing the CUG expansion in an unrelated mRNA develop myotonia and myopathy, consistent with an RNA gain of function. We demonstrated that transgenic mice carrying the CTG expansion in its human DM1 context (>45 kb) and producing abnormal DMPK mRNA with at least 300 CUG repeats, displayed clinical, histological, molecular and electrophysiological abnormalities in skeletal muscle consistent with those observed in DM1 patients. Like DM1 patients, these transgenic mice show abnormal tau expression in the brain. These results provide further evidence for the RNA trans-dominant effect of the CUG expansion, not only in muscle, but also in brain.
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Affiliation(s)
- H Seznec
- INSERM UR383, Hôpital Necker-Enfants Malades, Université René Descartes Paris V, 149-161 rue de Sèvres, 75743 Paris Cedex 15, France
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Seznec H, Lia-Baldini AS, Duros C, Fouquet C, Lacroix C, Hofmann-Radvanyi H, Junien C, Gourdon G. Transgenic mice carrying large human genomic sequences with expanded CTG repeat mimic closely the DM CTG repeat intergenerational and somatic instability. Hum Mol Genet 2000; 9:1185-94. [PMID: 10767343 DOI: 10.1093/hmg/9.8.1185] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Myotonic dystrophy (DM) is caused by a CTG repeat expansion in the 3'UTR of the DM protein kinase (DMPK) gene. A very high level of instability is observed through successive generations and the size of the repeat is generally correlated with the severity of the disease and with age at onset. Furthermore, tissues from DM patients exhibit somatic mosaicism that increases with age. We generated transgenic mice carrying large human genomic sequences with 20, 55 or >300 CTG, cloned from patients from the same affected DM family. Using large human flanking sequences and a large amplification, we demonstrate that the intergenerational CTG repeat instability is reproduced in mice, with a strong bias towards expansions and with the same sex- and size-dependent characteristics as in humans. Moreover, a high level of instability, increasing with age, can be observed in tissues and in sperm. Although we did not observe dramatic expansions (or 'big jumps' over several hundred CTG repeats) as in congenital forms of DM, our model carrying >300 CTG is the first to show instability so close to the human DM situation. Our three models carrying different sizes of CTG repeat provide insight on the different factors modulating the CTG repeat instability.
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Affiliation(s)
- H Seznec
- INSERM UR383, Hôpital Necker-Enfants Malades, Université René Descartes Paris V, Paris, France
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Lia AS, Seznec H, Hofmann-Radvanyi H, Radvanyi F, Duros C, Saquet C, Blanche M, Junien C, Gourdon G. Somatic instability of the CTG repeat in mice transgenic for the myotonic dystrophy region is age dependent but not correlated to the relative intertissue transcription levels and proliferative capacities. Hum Mol Genet 1998; 7:1285-91. [PMID: 9668171 DOI: 10.1093/hmg/7.8.1285] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A (CTG)nexpansion in the 3'-untranslated region (UTR) of the DM protein kinase gene ( DMPK ) is responsible for causing myotonic dystrophy (DM). Major instability, with very large expansions between generations and high levels of somatic mosaicism, is observed in patients. There is a good correlation between repeat size (at least in leucocytes), clinical severity and age of onset. The trinucleotide repeat instability mechanisms involved in DM and other human genetic diseases are unknown. We studied somatic instability by measuring the CTG repeat length at several ages in various tissues of transgenic mice carrying a (CTG)55expansion surrounded by 45 kb of the human DM region, using small-pool PCR. These mice have been shown to reproduce the intergenerational and somatic instability of the 55 CTG repeat suggesting that surrounding sequences and the chromatin environment are involved in instability mechanisms. As observed in some of the tissues of DM patients, there is a tendency for repeat length and somatic mosaicism to increase with the age of the mouse. Furthermore, we observed no correlation between the somatic mutation rate and tissue proliferation capacity. The somatic mutation rates in different tissues were also not correlated to the relative inter-tissue difference in transcriptional levels of the three genes (DMAHP , DMPK and 59) surrounding the repeat.
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Affiliation(s)
- A S Lia
- INSERM UR383, Hôpital Necker-Enfants Malades, clinique Maurice Lamy, 149-161 rue de Sèvres, 75743 Paris, Cedex 15, France
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