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Schlegel J, Liew H, Rein K, Dzyubachyk O, Debus J, Abdollahi A, Niklas M. Biosensor Cell-Fit-HD4D for correlation of single-cell fate and microscale energy deposition in complex ion beams. STAR Protoc 2022; 3:101798. [PMID: 36340882 PMCID: PMC9627659 DOI: 10.1016/j.xpro.2022.101798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We present a protocol for the biosensor Cell-Fit-HD4D. It enables long-term monitoring and correlation of single-cell fate with subcellular-deposited energy of ionizing radiation. Cell fate tracking using widefield time-lapse microscopy is uncoupled in time from confocal ion track imaging. Registration of both image acquisition steps allows precise ion track assignment to cells and correlation with cellular readouts. For complete details on the use and execution of this protocol, please refer to Niklas et al. (2022). Cell-Fit-HD4D is an in vitro biosensor for clinical ion beams Cell-Fit-HD4D combines single-cell dosimetry with individual tracking of tumor cells Cell-Fit-HD4D visualizes variability in radiation response in tumor cell population
Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.
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Ogawara R, Kusumoto T, Konishi T, Hamano T, Kodaira S. Polyethylene moderator optimized for increasing thermal neutron flux in the NASBEE accelerator-based neutron field. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Saint Martin G, Portu A, Ibarra M, Alurralde M. UV-C radiation effect on nuclear tracks of different ions in polycarbonate. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Gadan MA, Lloyd R, Saint Martin G, Olivera MS, Policastro L, Portu AM. Neutron Autoradiography Combined With UV-C Sensitization: Toward the Intracellular Localization of Boron. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2019; 25:1331-1340. [PMID: 31648656 DOI: 10.1017/s1431927619015058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Our group has reported the imprint formation of biological material on polycarbonate nuclear track detectors by UV-C exposure, which is used as an approach to simultaneously visualize cell imprints and nuclear tracks coming from the boron neutron capture reaction. Considering that the cell nucleus has a higher UV-C absorption than the cytoplasm and that hematoxylin preferentially stains the nucleus, we proposed to enhance the contrast between these two main cell structures by hematoxylin staining before UV-C sensitization. In this study, several experiments were performed in order to optimize UV-C exposure parameters and chemical etching conditions for cell imprint formation using the SK-BR-3 breast cancer cell line. The proposed method improves significantly the resolution of the cell imprints. It allows clear differentiation of the nucleus from the rest of the cell, together with nuclear tracks pits. Moreover, it reduces considerably the UV-C exposure time, an important experimental issue. The proposed methodology can be applied to study the boron distribution independently from the chosen cell line and/or boron compounds.
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Affiliation(s)
- Mario A Gadan
- Department of Instrumentation and Dosimetry, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- Institute of Nanoscience and Nanotechnology (INN), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Rodrigo Lloyd
- Institute of Nanoscience and Nanotechnology (INN), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- Laboratory of Nanomedicine, CNEA, Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- National Agency for Scientific and Technological Promotion (ANPCyT), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina
| | - Gisela Saint Martin
- Department of Radiobiology, CNEA, Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - María S Olivera
- Department of Boron Neutron Capture Therapy, CNEA, Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Lucía Policastro
- Institute of Nanoscience and Nanotechnology (INN), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- Laboratory of Nanomedicine, CNEA, Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- National Scientific and Technical Research Council (CONICET), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina
| | - Agustina M Portu
- Institute of Nanoscience and Nanotechnology (INN), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- Department of Radiobiology, CNEA, Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
- National Scientific and Technical Research Council (CONICET), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina
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Konishi T, Kodaira S, Itakura Y, Ohsawa D, Homma-Takeda S. IMAGING URANIUM DISTRIBUTION ON RAT KIDNEY SECTIONS THROUGH DETECTION OF ALPHA TRACKS USING CR-39 PLASTIC NUCLEAR TRACK DETECTOR. RADIATION PROTECTION DOSIMETRY 2019; 183:242-246. [PMID: 30521045 DOI: 10.1093/rpd/ncy224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Indexed: 06/09/2023]
Abstract
Uranium is renowned as a global contaminant, and attracts major concern with regards to the health risks involved because its nephrotoxicity. This paper discusses the development of a simple method to identify accumulated regions or localized sites of uranium within kidneys using the CR-39 plastic nuclear track detector. To demonstrate the proposed method, renal cryo-sections (5 μm-t) from Wistar male rats, subcutaneously administered with uranyl acetate (2 mg/kg), were prepared on day one after administration. Concerned sections were subsequently placed on CR-39, stored for 1.25 years, and then etched in a 7 M NaOH solution at 70°C for 3 h. α-tracks were then detected in the form of etch pits, corresponding to uranium, and also the tissue shape and structure were transferred as a roughness on the surface of CR-39. As observed, the proposed method served to facilitate simultaneous detection and identification of localized regions of uranium accumulation within kidneys.
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Affiliation(s)
- T Konishi
- Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - S Kodaira
- Department of Radiation Measurement and Dose Assessment, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Y Itakura
- Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Graduate School of Science and Engineering, Chiba University, Chiba, Japan
| | - D Ohsawa
- Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Graduate School of Medical and Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - S Homma-Takeda
- Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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Kodaira S, Li HK, Konishi T, Kitamura H, Kurano M, Hasegawa S. Validating α-particle emission from 211At-labeled antibodies in single cells for cancer radioimmunotherapy using CR-39 plastic nuclear track detectors. PLoS One 2017; 12:e0178472. [PMID: 28658304 PMCID: PMC5489156 DOI: 10.1371/journal.pone.0178472] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 05/13/2017] [Indexed: 11/18/2022] Open
Abstract
Recently, 211At has received increasing attention as a potential radionuclide for cancer radioimmunotherapy. It is a α-particle emitter, which is extremely effective against malignant cells. We demonstrate a method to verify the efficiency of 211At-labeled trastuzumab antibodies (211At-trastuzumab) against HER2 antigens, which has not been determined for radioimmunotherapy. A CR-39 plastic nuclear detector is used for measuring the position and the linear energy transfer (LET) of individual 211At α- particle tracks. The tracks and 211At-trastuzumab-binding cells were co-visualized by using the geometric information recorded on the CR-39. HER2-positive human gastric cancer cells (NCI-N87), labelled with 211At-trastuzumab, were dropped on the centre of the CR-39 plate. Microscope images of the cells and the corresponding α-tracks acquired by position matching were obtained. In addition, 3.5 cm × 3.5 cm macroscopic images of the whole plate were acquired. The distribution of number of α-particles emitted from single cells suggests that 80% of the 211At-trastuzumab-binding cells emitted α-particles. It also indicates that the α-particles may strike the cells several times along their path. The track-averaged LET of the α-particles is evaluated to be 131 keV/μm. These results will enable quantitative evaluation of delivered doses to target cells, and will be useful for the in vitro assessment of 211At-based radioimmunotherapeutic agents.
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Affiliation(s)
- Satoshi Kodaira
- Radiation Measurement Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- * E-mail:
| | - Huizi Keiko Li
- Radiation and Cancer Biology Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- JSPS Research Fellow, Graduate School of Medical and Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Teruaki Konishi
- Regenerative Therapy Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Hisashi Kitamura
- Radiation Measurement Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Mieko Kurano
- Radiation Measurement Research Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Sumitaka Hasegawa
- Radiation and Cancer Biology Team, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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Portu A, Rossini AE, Thorp SI, Curotto P, Pozzi ECC, Granell P, Golmar F, Cabrini RL, Martin GS. Simultaneous Observation of Cells and Nuclear Tracks from the Boron Neutron Capture Reaction by UV-C Sensitization of Polycarbonate. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:796-804. [PMID: 26155721 DOI: 10.1017/s1431927615014348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The distribution of boron in tissue samples coming from boron neutron capture therapy protocols can be determined through the analysis of its autoradiography image on a nuclear track detector. A more precise knowledge of boron atom location on the microscopic scale can be attained by the observation of nuclear tracks superimposed on the sample image on the detector. A method to produce an "imprint" of cells cultivated on a polycarbonate detector was developed, based on the photodegradation properties of UV-C radiation on this material. Optimal conditions to generate an appropriate monolayer of Mel-J cells incubated with boronophenylalanine were found. The best images of both cells and nuclear tracks were obtained for a neutron fluence of 1013 cm-2, 6 h UV-C (254 nm) exposure, and 4 min etching time with a KOH solution. The imprint morphology was analyzed by both light and scanning electron microscopy. Similar samples, exposed to UV-A (360 nm) revealed no cellular imprinting. Etch pits were present only inside the cell imprints, indicating a preferential boron uptake (about threefold the incubation concentration). Comparative studies of boron absorption in different cell lines and in vitro evaluation of the effect of diverse boron compounds are feasible with this methodology.
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Affiliation(s)
- Agustina Portu
- 1Department of Radiobiology,National Atomic Energy Commission (CNEA),Av. General Paz 1499,B1650KNA,San Martín,Buenos Aires,Argentina
| | - Andrés Eugenio Rossini
- 3Nuclear Regulatory Authority (ARN),Libertador 8250,C1429BNP,Ciudad Autónoma de Buenos Aires,Argentina
| | - Silvia Inés Thorp
- 4Department of Instrumentation and Control,CNEA,Presbítero Juan González Aragón,B1802AYA,Ezeiza,Buenos Aires,Argentina
| | - Paula Curotto
- 5Department of Research and Production Reactors,CNEA,Presbítero Juan González Aragón,B1802AYA,Ezeiza,Buenos Aires,Argentina
| | - Emiliano César Cayetano Pozzi
- 5Department of Research and Production Reactors,CNEA,Presbítero Juan González Aragón,B1802AYA,Ezeiza,Buenos Aires,Argentina
| | - Pablo Granell
- 6Micro and Nanotechnology Centre of the Bicentennial (CNMB),National Institute of Industrial Technology (INTI),Av. Gral. Paz 5445,Ed. 42,B1650JKA,San Martín,Buenos Aires,Argentina
| | - Federico Golmar
- 2National Research Council (CONICET),Av. Rivadavia 1917,C1033AAJ,Ciudad Autónoma de Buenos Aires,Argentina
| | - Rómulo Luis Cabrini
- 1Department of Radiobiology,National Atomic Energy Commission (CNEA),Av. General Paz 1499,B1650KNA,San Martín,Buenos Aires,Argentina
| | - Gisela Saint Martin
- 1Department of Radiobiology,National Atomic Energy Commission (CNEA),Av. General Paz 1499,B1650KNA,San Martín,Buenos Aires,Argentina
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Kodaira S, Konishi T, Kobayashi A, Maeda T, Ahmad TAFT, Yang G, Akselrod MS, Furusawa Y, Uchihori Y. Co-visualization of DNA damage and ion traversals in live mammalian cells using a fluorescent nuclear track detector. JOURNAL OF RADIATION RESEARCH 2015; 56:360-365. [PMID: 25324538 PMCID: PMC4380042 DOI: 10.1093/jrr/rru091] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/03/2014] [Accepted: 09/13/2014] [Indexed: 06/04/2023]
Abstract
The geometric locations of ion traversals in mammalian cells constitute important information in the study of heavy ion-induced biological effect. Single ion traversal through a cellular nucleus produces complex and massive DNA damage at a nanometer level, leading to cell inactivation, mutations and transformation. We present a novel approach that uses a fluorescent nuclear track detector (FNTD) for the simultaneous detection of the geometrical images of ion traversals and DNA damage in single cells using confocal microscopy. HT1080 or HT1080-53BP1-GFP cells were cultured on the surface of a FNTD and exposed to 5.1-MeV/n neon ions. The positions of the ion traversals were obtained as fluorescent images of a FNTD. Localized DNA damage in cells was identified as fluorescent spots of γ-H2AX or 53BP1-GFP. These track images and images of damaged DNA were obtained in a short time using a confocal laser scanning microscope. The geometrical distribution of DNA damage indicated by fluorescent γ-H2AX spots in fixed cells or fluorescent 53BP1-GFP spots in living cells was found to correlate well with the distribution of the ion traversals. This method will be useful for evaluating the number of ion hits on individual cells, not only for micro-beam but also for random-beam experiments.
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Affiliation(s)
- Satoshi Kodaira
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
| | - Teruaki Konishi
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
| | - Alisa Kobayashi
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
| | - Takeshi Maeda
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
| | | | - Gen Yang
- State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, PR China
| | - Mark S Akselrod
- Landauer Inc., Crystal Growth Division, Stillwater, OK 74074, USA
| | - Yoshiya Furusawa
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
| | - Yukio Uchihori
- Research, Development and Support Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inageku, Chiba 263-8555, Japan
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Portu AM, Rossini AE, Gadan MA, Bernaola OA, Thorp SI, Curotto P, Pozzi ECC, Cabrini RL, Martin GS. Experimental set up for the irradiation of biological samples and nuclear track detectors with UV C. Rep Pract Oncol Radiother 2014; 21:129-34. [PMID: 26933396 DOI: 10.1016/j.rpor.2014.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 07/10/2014] [Accepted: 10/10/2014] [Indexed: 11/29/2022] Open
Abstract
AIM In this work we present a methodology to produce an "imprint" of cells cultivated on a polycarbonate detector by exposure of the detector to UV C radiation. BACKGROUND The distribution and concentration of (10)B atoms in tissue samples coming from BNCT (Boron Neutron Capture Therapy) protocols can be determined through the quantification and analysis of the tracks forming its autoradiography image on a nuclear track detector. The location of boron atoms in the cell structure could be known more accurately by the simultaneous observation of the nuclear tracks and the sample image on the detector. MATERIALS AND METHODS A UV C irradiator was constructed. The irradiance was measured along the lamp direction and at different distances. Melanoma cells were cultured on polycarbonate foils, incubated with borophenylalanine, irradiated with thermal neutrons and exposed to UV C radiation. The samples were chemically attacked with a KOH solution. RESULTS A uniform irradiation field was established to expose the detector foils to UV C light. Cells could be seeded on the polycarbonate surface. Both imprints from cells and nuclear tracks were obtained after chemical etching. CONCLUSIONS It is possible to yield cellular imprints in polycarbonate. The nuclear tracks were mostly present inside the cells, indicating a preferential boron uptake.
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Affiliation(s)
- Agustina Mariana Portu
- Department of Radiobiology, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina; National Research Council (CONICET), Av. Rivadavia 1917, C1033AAJ, Ciudad Autónoma de Buenos Aires, Argentina
| | - Andrés Eugenio Rossini
- Department of Radiobiology, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Mario Alberto Gadan
- Department of Instrumentation and Control, CNEA, Presbítero Juan González Aragón, B1802AYA Ezeiza, Buenos Aires, Argentina
| | - Omar Alberto Bernaola
- Department of Radiobiology, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Silvia Inés Thorp
- Department of Instrumentation and Control, CNEA, Presbítero Juan González Aragón, B1802AYA Ezeiza, Buenos Aires, Argentina
| | - Paula Curotto
- Department of Research and Production Reactors, CNEA, Presbítero Juan González Aragón, B1802AYA, Ezeiza, Buenos Aires, Argentina
| | - Emiliano César Cayetano Pozzi
- Department of Research and Production Reactors, CNEA, Presbítero Juan González Aragón, B1802AYA, Ezeiza, Buenos Aires, Argentina
| | - Rómulo Luis Cabrini
- Department of Radiobiology, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina; Faculty of Dentistry, University of Buenos Aires, Marcelo T. de Alvear 2142, C1122AAH, Ciudad Autónoma de Buenos Aires, Argentina
| | - Gisela Saint Martin
- Department of Radiobiology, National Atomic Energy Commission (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
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Rossini AE, Dagrosa MA, Portu A, Saint Martin G, Thorp S, Casal M, Navarro A, Juvenal GJ, Pisarev MA. Assessment of biological effectiveness of boron neutron capture therapy in primary and metastatic melanoma cell lines. Int J Radiat Biol 2014; 91:81-9. [DOI: 10.3109/09553002.2014.942013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Tanaka H, Sakurai Y, Suzuki M, Masunaga SI, Takamiya K, Maruhashi A, Ono K. Development of a simple and rapid method of precisely identifying the position of 10B atoms in tissue: an improvement in standard alpha autoradiography. JOURNAL OF RADIATION RESEARCH 2014; 55:373-380. [PMID: 24142968 PMCID: PMC3951073 DOI: 10.1093/jrr/rrt110] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 08/09/2013] [Accepted: 08/16/2013] [Indexed: 05/27/2023]
Abstract
Boron neutron capture therapy (BNCT) can be utilized to selectively kill cancer cells using a boron compound that accumulates only in cancer cells and not in normal cells. Tumor-bearing animals treated by BNCT are routinely used to evaluate long-term antitumor effects of new boron compounds. Alpha-autoradiography is one of the methods employed in the evaluation of antitumor effects. However, a standard alpha-autoradiography cannot detect the microdistribution of (10)B because of the difficulty associated with the superposition of a tissue sample image and etched pits on a track detector with the etching process. In order to observe the microdistribution of (10)B, some special methods of alpha-autoradiography have been developed that make use of a special track detector, or the atomic force microscope combined with X-ray and UV light irradiation. In contrast, we propose, herein, a simple and rapid method of precisely identifying the position of (10)B using the imaging process and the shape of etched pits, such as their circularity, without the need to use special track detectors or a microscope. A brief description of this method and its verification test are presented in this article. We have established a method of detecting the microdistribution of (10)B with submicron deviation between the position of etched pits and the position of reaction in a tissue sample, for a given circularity of etched pits.
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Affiliation(s)
| | | | | | | | | | | | - Koji Ono
- Corresponding author. Kyoto University Research Reactor Institute, 2-1010, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan. Tel: +81-72-451-2475; Fax: +81-72-451-2627;
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Konishi T, Takeyasu A, Natsume T, Furusawa Y, Hieda K. Visualization of heavy ion tracks by labeling 3'-OH termini of induced DNA strand breaks. JOURNAL OF RADIATION RESEARCH 2011; 52:433-440. [PMID: 21785232 DOI: 10.1269/jrr.10097] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
African green monkey kidney cells, CV-1, were irradiated with Carbon ions (LET: 735 keV/µm Argon ions (LET: 3,000 keV/µm) to visualize ion tracks through the cell nucleus by labeling the 3'-OH termini result of DNA strand breaks. The 3'-OH termini of DNA were labeled with BrdU-triphosphate catalyzed by TdT. This method of TUNEL (TdT-mediated dUTP Nick End labeling) is based on the specific binding of TdT to 3'-OH termini of DNA. Subsequent immuno-fluorescent staining with the primary monoclonal antibody against BrdU, followed by a secondary antibody of Alexa Fluor 488, was performed to visualize the BrdU labeled DNA termini. Images of the cell nuclei were acquired by confocal laser microscopy. When cell monolayers were irradiated perpendicularly with argon ions, induced DSBs in cell nuclei were identifiable as fluorescent spots. In another irradiation setup, when cells were irradiated at a small angle with incident argon ions, DNA strand breaks were detected as fluorescent stripes across the cell nucleus. These results demonstrate the induction of 3'-OH termini at sites of DNA strand breaks along Argon ion tracks.
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Affiliation(s)
- Teruaki Konishi
- Department of Technical Support and Development, Fundamental Technology Center, National Institute of Radiological Sciences.
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