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Hattori Y, Andoh T, Kawabata S, Hu N, Michiue H, Nakamura H, Nomoto T, Suzuki M, Takata T, Tanaka H, Watanabe T, Ono K. Proposal of recommended experimental protocols for in vitro and in vivo evaluation methods of boron agents for neutron capture therapy. JOURNAL OF RADIATION RESEARCH 2023; 64:859-869. [PMID: 37717596 PMCID: PMC10665309 DOI: 10.1093/jrr/rrad064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 06/19/2023] [Accepted: 08/19/2023] [Indexed: 09/19/2023]
Abstract
Recently, boron neutron capture therapy (BNCT) has been attracting attention as a minimally invasive cancer treatment. In 2020, the accelerator-based BNCT with L-BPA (Borofalan) as its D-sorbitol complex (Steboronine®) for head and neck cancers was approved by Pharmaceutical and Medical Devices Agency for the first time in the world. As accelerator-based neutron generation techniques are being developed in various countries, the development of novel tumor-selective boron agents is becoming increasingly important and desired. The Japanese Society of Neutron Capture Therapy believes it is necessary to propose standard evaluation protocols at each stage in the development of boron agents for BNCT. This review summarizes recommended experimental protocols for in vitro and in vivo evaluation methods of boron agents for BNCT based on our experience with L-BPA approval.
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Affiliation(s)
- Yoshihide Hattori
- Research Center for BNCT, Osaka Metropolitan University, 1-1 Gakuen-cho, Nakaku, Sakai 599-8531, Japan
| | - Tooru Andoh
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, Kobe 650-8586, Japan
| | - Shinji Kawabata
- Department of Neurosurgery, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan
| | - Naonori Hu
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun 590-0494 Japan
| | - Hiroyuki Michiue
- Neutron Therapy Research Center, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama 700-8558, Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Takahiro Nomoto
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Minoru Suzuki
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun 590-0494 Japan
| | - Takushi Takata
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun 590-0494 Japan
| | - Hiroki Tanaka
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun 590-0494 Japan
| | - Tsubasa Watanabe
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori-cho, Sennan-gun 590-0494 Japan
| | - Koji Ono
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi, Takatsuki-shi, Osaka 569-8686, Japan
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Iwasaki R, Yoshikawa R, Umeno R, Seki A, Matsukawa T, Takeno S, Yokoyama K, Mori T, Suzuki M, Ono K. The effects of BPA-BNCT on normal bone: determination of the CBE value in mice‡. JOURNAL OF RADIATION RESEARCH 2023; 64:795-803. [PMID: 37517393 PMCID: PMC10516729 DOI: 10.1093/jrr/rrad054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/03/2023] [Indexed: 08/01/2023]
Abstract
Boron neutron capture therapy (BNCT) with p-boronophenylalanine (BPA) is expected to have less effect on the decrease in normal bone strength than X-ray therapy. However, the compound biological effectiveness (CBE) value necessary to convert the boron neutron capture reaction (BNCR) dose into a bioequivalent X-ray dose has not been determined yet. The purpose of this study was to evaluate the influence of BNCT on normal bone in mice and to elucidate the CBE factor. We first searched the distribution of BPA in the normal bone of C3H/He mice and then measured the changes in bone strength after irradiation. The CBE value was determined when the decrease in bone strength was set as an index of the BNCT effect. The 10B concentrations in the tibia after subcutaneous injection of 125, 250 and 500 mg/kg BPA were measured by prompt gamma-ray spectroscopy and inductively coupled plasma (ICP)-atomic emission spectrometry. The 10B mapping in the tibia was examined by alpha-track autoradiography and laser ablation-ICP-mass spectrometry. The 10B concentration increased dose-dependently; moreover, the concentrations were maintained until 120 min after BPA administration. The administered 10B in the tibia was abundantly accumulated in the growth cartilage, trabecular bone and bone marrow. The bone strength was analyzed by a three-point bending test 12 weeks after irradiation. The bending strength of the tibia decreased dose-dependently after the irradiation of X-ray, neutron and BNCR. The CBE factor was obtained as 2.27 by comparing these dose-effect curves; the value determined in this study will enable an accurate dosimetry of normal bone.
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Affiliation(s)
- Ryota Iwasaki
- Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Ryutaro Yoshikawa
- Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Ryo Umeno
- Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Azusa Seki
- HAMRI Co. Ltd., 2638-2 Ozaki, Koga-shi, Ibaragi 306-0101, Japan
| | - Takehisa Matsukawa
- Department of Epidemiology and Environmental Health, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
- Department of Forensic Medicine, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Satoshi Takeno
- Department of Radiation Oncology, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi Takatsuki-shi, Osaka 569-8686, Japan
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi Takatsuki-shi, Osaka 569-8686, Japan
| | - Kazuhito Yokoyama
- Department of Epidemiology and Environmental Health, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
- Department of Epidemiology and Social Medicine, International University of Health and Welfare, 4-1-26 Akasaka, Minato-ku, Tokyo 107-8402, Japan
| | - Takashi Mori
- Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
| | - Minoru Suzuki
- Particle Radiation Oncology Research Center, Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2-1010, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
| | - Koji Ono
- Kansai BNCT Medical Center, Osaka Medical and Pharmaceutical University, 2-7 Daigaku-machi Takatsuki-shi, Osaka 569-8686, Japan
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Portu AM, Espain MS, Thorp SI, Trivillin VA, Curotto P, Monti Hughes A, Pozzi ECC, Garabalino MA, Palmieri MA, Granell PN, Golmar F, Schwint AE, Saint Martin G. Enhanced Resolution of Neutron Autoradiography with UV-C Sensitization to Study Boron Microdistribution in Animal Models. Life (Basel) 2023; 13:1578. [PMID: 37511953 PMCID: PMC10381447 DOI: 10.3390/life13071578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/12/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
The assessment of boron microdistribution is essential to evaluate the suitability of boron neutron capture therapy (BNCT) in different biological models. In our laboratory, we have reported a methodology to produce cell imprints on polycarbonate through UV-C sensitization. The aim of this work is to extend the technique to tissue samples in order to enhance spatial resolution. As tissue structure largely differs from cultured cells, several aspects must be considered. We studied the influence of the parameters involved in the imprint and nuclear track formation, such as neutron fluence, different NTDs, etching and UV-C exposure times, tissue absorbance, thickness, and staining, among others. Samples from different biological models of interest for BNCT were used, exhibiting homogeneous and heterogeneous histology and boron microdistribution. The optimal conditions will depend on the animal model under study and the resolution requirements. Both the imprint sharpness and the fading effect depend on tissue thickness. While 6 h of UV-C was necessary to yield an imprint in CR-39, only 5 min was enough to observe clear imprints on Lexan. The information related to microdistribution of boron obtained with neutron autoradiography is of great relevance when assessing new boron compounds and administration protocols and also contributes to the study of the radiobiology of BNCT.
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Affiliation(s)
- Agustina Mariana Portu
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
- School of Science & Technology, National University of San Martín (UNSAM), San Martín B1650JKA, Argentina
| | - María Sol Espain
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
- School of Science & Technology, National University of San Martín (UNSAM), San Martín B1650JKA, Argentina
| | - Silvia Inés Thorp
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
| | - Verónica Andrea Trivillin
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
| | - Paula Curotto
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
| | - Andrea Monti Hughes
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
| | | | | | - Mónica Alejandra Palmieri
- Department of Biodiversity and Experimental Biology, Faculty of Exact and Natural Sciences, University of Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires C1428EGA, Argentina
| | - Pablo Nicolás Granell
- Micro and Nanotechnology Centre of the Bicentennial (CNMB), National Institute of Industrial Technology (INTI), San Martín B1650JKA, Argentina
| | - Federico Golmar
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
- School of Science & Technology, National University of San Martín (UNSAM), San Martín B1650JKA, Argentina
- Micro and Nanotechnology Centre of the Bicentennial (CNMB), National Institute of Industrial Technology (INTI), San Martín B1650JKA, Argentina
| | - Amanda Elena Schwint
- National Atomic Energy Commission (CNEA), San Martín C1429BNP, Argentina
- National Scientific and Technological Research Council (CONICET), Ciudad Autónoma de Buenos Aires C1425FQB, Argentina
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Takada S, Kondo N, Hagimori M, Temma T. Development of a switching-type fluorescence sensor for the detection of boronic acid-containing agents. ANAL SCI 2022; 38:1289-1296. [PMID: 35796996 DOI: 10.1007/s44211-022-00158-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 06/22/2022] [Indexed: 11/25/2022]
Abstract
Since the therapeutic effect of boron neutron capture therapy is influenced by the intracellular distribution profile of boronoagents containing 10B atoms, it is necessary to establish a method that can determine the intracellular distribution profile of boronoagents. We aimed to develop a small molecule-based fluorescence sensor that changes its fluorescence properties upon complexation with the boronic acid moiety of a boronoagent. Thus, we designed a 2-(2-pyridyl)phenol derivative PPN-1 by introducing a N,O ligand substructure into a zinc sensor probe with excellent fluorescence properties. To investigate the effectiveness of PPN-1, we synthesized PPN-1 and evaluated its fluorescence properties compared to DAHMI, a current available boronic acid sensor. Consequently, PPN-1 showed favorable off/on fluorescence switching ability with a large Stokes shift after the addition of p-boronophenylalanine (BPA). Notably, after adding BPA, PPN-1 exhibited a rapid increase and reached a fluorescence plateau within 5 min, which is much shorter than the 2 h needed for DAHMI. Further, PPN-1 has excellent selectivity and detection and quantification limits similar to those of ICP-OES. These results demonstrated that PPN-1 is a practical scaffold for the detection and quantification of boronic acids and will provide essential insights for the development of boronic acid-targeted fluorescent sensors in the future.
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Affiliation(s)
- Shinya Takada
- Department of Biofunctional Analysis, Graduate School of Pharmaceutical Sciences, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Naoya Kondo
- Department of Biofunctional Analysis, Graduate School of Pharmaceutical Sciences, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan
| | - Masayori Hagimori
- Faculty of Pharmaceutical Sciences, Mukogawa Women's University, 11-68 Koshien Kyubancho, Nishinomiya, 663-8179, Japan
| | - Takashi Temma
- Department of Biofunctional Analysis, Graduate School of Pharmaceutical Sciences, Osaka Medical and Pharmaceutical University, 4-20-1 Nasahara, Takatsuki, Osaka, 569-1094, Japan.
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Protection-Free Strategy for the Synthesis of Boro-Depsipeptides in Aqueous Media under Microwave-Assisted Conditions. Molecules 2022; 27:molecules27072325. [PMID: 35408725 PMCID: PMC9000886 DOI: 10.3390/molecules27072325] [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] [Received: 01/28/2022] [Revised: 03/27/2022] [Accepted: 03/30/2022] [Indexed: 02/04/2023] Open
Abstract
In this report, 19 boron-containing depsipeptides were synthesized via microwave-assisted Passerini three-component reaction (P-3CR) in an aqueous environment. The linker-free DAHMI fluorescent tagging approach was used on selected boron-containing compounds to study the relationship between their structures and their level of cellular uptake of HEK293 cells. The biological data retrieved from the DAHMI experiments indicated that while the structures of tested compounds may be highly similar, their bio-distribution profile could be vastly distinctive. The reported optimized one-pot synthetic strategy along the linker-free in vitro testing protocol could provide an efficient platform to accelerate the development of boron-containing drugs.
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Sanada Y, Takata T, Tanaka H, Sakurai Y, Watanabe T, Suzuki M, Masunaga SI. HIF-1α affects sensitivity of murine squamous cell carcinoma to boron neutron capture therapy with BPA. Int J Radiat Biol 2021; 97:1441-1449. [PMID: 34264166 DOI: 10.1080/09553002.2021.1956004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Purpose To examine whether hypoxia and Hif-1α affect sensitivity of murine squamous cell carcinoma cells to boron neutron capture therapy (BNCT).Materials and methods SCC VII and SCC VII Hif-1α-deficient mouse tumor cells were incubated under normoxic or hypoxic conditions, and cell survival after BNCT was assessed. The intracellular concentration of the 10B-carrier, boronophenylalanine-10B (BPA), was estimated using an autoradiography technique. The expression profile of SLC7A5, which is involved in the uptake of BPA, and the amount of DNA damage caused by BNCT with BPA were examined. A cell survival assay was performed on cell suspensions prepared from tumor-bearing mice.Results Hypoxia ameliorated SCC VII cell survival after neutron irradiation with BPA, but not BSH. Hypoxia-treated SCC VII cells showed decreased intracellular concentrations of BPA and the down-regulated expression of the SLC7A5 protein. BPA uptake and the SLC7A5 protein were not decreased in hypoxia-treated Hif-1α-deficient cells, the survival of which was lower than that of SCC VII cells. More DNA damage was induced in SCC VII Hif-1α-deficient cells than in SCC VII cells. In experiments using tumor-bearing mice, the survival of SCC VII Hif-1α-deficient cells was lower than that of SCC VII cells.Conclusion. Hypoxia may decrease the effects of BNCT with BPA, whereas the disruption of Hif-1α enhanced sensitivity to BNCT with BPA.
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Affiliation(s)
- Yu Sanada
- Particle Radiation Biology, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Takushi Takata
- Particle Radiation Medical Physics, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Hiroki Tanaka
- Particle Radiation Medical Physics, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Yoshinori Sakurai
- Particle Radiation Medical Physics, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Tsubasa Watanabe
- Particle Radiation Biology, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Minoru Suzuki
- Particle Radiation Oncology, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
| | - Shin-Ichiro Masunaga
- Particle Radiation Biology, Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Japan
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Quantitative autoradiography in boron neutron capture therapy considering the particle ranges in the samples. Phys Med 2021; 82:306-320. [PMID: 33721790 DOI: 10.1016/j.ejmp.2021.02.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 01/13/2021] [Accepted: 02/19/2021] [Indexed: 11/21/2022] Open
Abstract
PURPOSE Boron neutron capture therapy is a cellular-scale particle therapy exploiting boron neutron capture reactions in boron compounds distributed in tumour cells. Its therapeutic effect depends on both the accumulation of boron in tumour cells and the neutron fluence. Autoradiography is used to visualise the micro-distribution of boron compounds. METHODS Here, we present an equation for the relationship between boron concentration and pit density on the solid-state nuclear track detector, taking into consideration the particle ranges in the samples. This equation is validated using liver-tissue sections and boron standard solutions. Moreover, we present a simple co-localisation system for pit and tissue-section images that requires no special equipment. RESULTS The equation reproduces the experimentally observed trends between boron concentration and pit density. This equation provides a theoretical explanation for the widely used calibration curve between pit density and boron concentration; it also provides a method to correct for differences of tissue-section thickness in quantitative autoradiography. CONCLUSIONS Using the equation together with this co-localisation system could improve micro-scale quantitative estimation in tissue sections.
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Kim A, Suzuki M, Matsumoto Y, Fukumitsu N, Nagasaki Y. Non-isotope enriched phenylboronic acid-decorated dual-functional nano-assembles for an actively targeting BNCT drug. Biomaterials 2020; 268:120551. [PMID: 33307363 DOI: 10.1016/j.biomaterials.2020.120551] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/24/2020] [Accepted: 11/18/2020] [Indexed: 12/11/2022]
Abstract
The feasibility of boron neutron capture therapy (BNCT) greatly depends on the selective accumulation of 10B in tumors. The p-boronophenylalanine-fructose (BPA-f) complex has been established as a conventional BNCT agent due to its preferential uptake into tumors, which is driven by amino acid transporters. However, the retention of BPA-f in tumors is highly limited because of an antiport mechanism, which is regulated by a gradient of amino acid concentration across the cancer cell membrane. Thus, to preserve a high 10B concentration in tumors, patients are inevitably subjected to a constant intravenous infusion. To this end, we employed a phenylboronic acid (PBA)-decorated polymeric nanoparticle (NanoPBA) as a sialic acid-targeting BNCT agent. In this manner, the PBA can exhibit dual functionalities, i.e., exhibiting a neutron capture capacity and hypersialyated cancer cell targeting effect. Our developed NanoPBA possesses a supramolecular structure composed of a core and shell comprised of poly(lactic acid) (PLA) and poly(ethylene glycol) (PEG) segments, respectively. The PBA moiety is installed at the PEG end, providing an unusually strong targeting effect, supposedly via multivalent binding onto the cancer cell membrane. As in BNCT, we verified the feasibility of NanoPBA against a B16 melanoma-bearing mouse model. By virtue of efficient tumor targeting, even at a 100-fold lower dose than BPA-f, the NanoPBA achieved a potent antitumor effect.
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Affiliation(s)
- Ahram Kim
- Department of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan
| | - Minoru Suzuki
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Yoshitaka Matsumoto
- Department of Radiation Oncology, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki, 305-8576, Japan; Proton Medical Research Center, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki, 305-8576, Japan
| | - Nobuyoshi Fukumitsu
- Department of Radiation Oncology, Kobe Proton Center, 1-6-8 Minatojima Minamimachi, Chuo-ku, Kobe, 650-0047, Japan
| | - Yukio Nagasaki
- Department of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan; Master's Program in Medical Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan; Center for Research in Isotopes and Environmental Dynamics (CRiED), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan.
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Colocalization of tracks from boron neutron capture reactions and images of isolated cells. Appl Radiat Isot 2020; 167:109353. [PMID: 33039761 DOI: 10.1016/j.apradiso.2020.109353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 07/07/2020] [Accepted: 07/21/2020] [Indexed: 01/31/2023]
Abstract
In Boron Neutron Capture Therapy, the boronated drug plays a leading role in delivering a lethal dose to the tumour. The effectiveness depends on the boron macroscopic concentration and on its distribution at sub-cellular level. This work shows a way to colocalize alpha particles and lithium ions tracks with cells. A neutron autoradiography technique is used, which combines images of cells with images of tracks produced in a solid-state nuclear track detector.
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Espain MS, Dattoli Viegas AM, Trivillin VA, Saint Martin G, Thorp SI, Curotto P, Pozzi ECC, González SJ, Portu AM. Neutron autoradiography to study the microdistribution of boron in the lung. Appl Radiat Isot 2020; 165:109331. [PMID: 32777741 DOI: 10.1016/j.apradiso.2020.109331] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 06/30/2020] [Accepted: 07/07/2020] [Indexed: 12/12/2022]
Abstract
In Argentina, a multi-institutional project has been established to assess the feasibility of applying BNCT ex-situ to the treatment of patients with multiple metastases in both lungs. Within this context, this work aims at applying the neutron autoradiography technique to study boron microdistribution in the lung. A comprehensive analysis of the different aspects for the generation of autoradiographic images of both normal and metastatic BDIX rat lungs was achieved. Histology, boron uniformity, optimal tissue thickness and water content in tissue were explored for the two types of samples. A qualitative and a quantitative analysis were performed. No heterogeneities in uptake were observed in normal lung. Conversely, samples with metastasis showed preferential boron uptake in the tumour areas with respect to surrounding tissue. Surrounding tissue would present a slightly higher uptake of boron than the normal lung. Quantitative results of boron concentration values and ratios determined by neutron autoradiography were obtained. In order to contribute to BNCT dosimetry, further analysis increasing the number of samples is warranted.
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Affiliation(s)
- María Sol Espain
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón I, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina; Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Ana Mailén Dattoli Viegas
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón I, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina; Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Verónica Andrea Trivillin
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina
| | - Gisela Saint Martin
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Silvia Inés Thorp
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | - Paula Curotto
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina
| | | | - Sara Josefina González
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina
| | - Agustina Mariana Portu
- Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, B1650KNA, San Martín, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2270, C1425FQD, Ciudad Autónoma de Buenos Aires, Argentina.
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Hussein EM. Imaging with naturally occurring radiation. Appl Radiat Isot 2019; 145:223-239. [DOI: 10.1016/j.apradiso.2018.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 10/30/2018] [Accepted: 12/04/2018] [Indexed: 10/27/2022]
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12
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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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Hattori Y, Ishimura M, Ohta Y, Takenaka H, Kirihata M. Visualization of Boronic Acid Containing Pharmaceuticals in Live Tumor Cells Using a Fluorescent Boronic Acid Sensor. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00522] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshihide Hattori
- Research
Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan
| | - Miki Ishimura
- Research
Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan
| | - Yoichiro Ohta
- Research
Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan
| | - Hiroshi Takenaka
- Research
Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan
| | - Mitsunori Kirihata
- Research
Center of Boron Neutron Capture Therapy, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan
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Watanabe T, Hattori Y, Ohta Y, Ishimura M, Nakagawa Y, Sanada Y, Tanaka H, Fukutani S, Masunaga SI, Hiraoka M, Ono K, Suzuki M, Kirihata M. Comparison of the pharmacokinetics between L-BPA and L-FBPA using the same administration dose and protocol: a validation study for the theranostic approach using [ 18F]-L-FBPA positron emission tomography in boron neutron capture therapy. BMC Cancer 2016; 16:859. [PMID: 27821116 PMCID: PMC5100278 DOI: 10.1186/s12885-016-2913-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 10/28/2016] [Indexed: 12/02/2022] Open
Abstract
Background Boron neutron capture therapy (BNCT) is a cellular-level particle radiation therapy that combines the selective delivery of boron compounds to tumour tissue with neutron irradiation. L-p-Boronophenylalanine (L-BPA) is a boron compound now widely used in clinical situations. Determination of the boron distribution is required for successful BNCT prior to neutron irradiation. Thus, positron emission tomography with [18F]-L-FBPA, an 18F-labelled radiopharmaceutical analogue of L-BPA, was developed. However, several differences between L-BPA and [18F]-L-FBPA have been highlighted, including the different injection doses and administration protocols. The purpose of this study was to clarify the equivalence between L-BPA and [19F]-L-FBPA as alternatives to [18F]-L-FBPA. Methods SCC-VII was subcutaneously inoculated into the legs of C3H/He mice. The same dose of L-BPA or [19F]-L-FBPA was subcutaneously injected. The time courses of the boron concentrations in blood, tumour tissue, and normal tissue were compared between the groups. Next, we administered the therapeutic dose of L-BPA or the same dose of [19F]-L-FBPA by continuous infusion and compared the effects of the administration protocol on boron accumulation in tissues. Results There were no differences between L-BPA and [19F]-L-FBPA in the transition of boron concentrations in blood, tumour tissue, and normal tissue using the same administration protocol. However, the normal tissue to blood ratio of the boron concentrations in the continuous-infusion group was lower than that in the subcutaneous injection group. Conclusions No difference was noted in the time course of the boron concentrations in tumour tissue and normal tissues between L-BPA and [19F]-L-FBPA. However, the administration protocol had effects on the normal tissue to blood ratio of the boron concentration. In estimating the BNCT dose in normal tissue by positron emission tomography (PET), we should consider the possible overestimation of the normal tissue to blood ratio of the boron concentrations derived from the values measured by PET on dose calculation. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2913-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tsubasa Watanabe
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan.,Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yoshihide Hattori
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka, Japan
| | - Youichiro Ohta
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka, Japan
| | - Miki Ishimura
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka, Japan
| | - Yosuke Nakagawa
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Yu Sanada
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Hiroki Tanaka
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Satoshi Fukutani
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Shin-Ichiro Masunaga
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Masahiro Hiraoka
- Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Koji Ono
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Minoru Suzuki
- Kyoto University Research Reactor Institute, 2-1010 Asashiro-Nishi, Kumatori-cho, Sennan-gun, Osaka, 590-0494, Japan
| | - Mitsunori Kirihata
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka, Japan.
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Ono K. An analysis of the structure of the compound biological effectiveness factor. JOURNAL OF RADIATION RESEARCH 2016; 57 Suppl 1:i83-i89. [PMID: 27021218 PMCID: PMC4990111 DOI: 10.1093/jrr/rrw022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This report is an analysis of the structure of the compound biological effectiveness (CBE) factor. The value of the CBE factor previously reported was revalued for the central nervous system, skin and lung. To describe the structure, the following terms are introduced: the vascular CBE (v-CBE), intraluminal CBE (il-CBE), extraluminal CBE (el-CBE) and non-vascular CBE (nv-CBE) factors and the geometric biological factor (GBF), i.e. the contributions that are derived from the total dose to the vasculature, each dose to vasculature from the intraluminal side and the extraluminal side, the dose to the non-vascular tissue and the factor to calculate el-CBE from il-CBE, respectively. The el-CBE factor element was also introduced to relate il-CBE to el-CBE factors. A CBE factor of 0.36 for disodium mercaptoundecahydrododecaborate (BSH) for the CNS was independent of the (10)B level in the blood; however, that for p-Boron-L-phenylalanine (BPA) increased with the (10)B level ratio of the normal tissue to the blood (N/B). The CBE factor was expressed as follows: factor = 0.32 + N/B × 1.65. The factor of 0.32 at 0 of N/B was close to the CBE factor for BSH. GBFs had similar values, between BSH and BPA, 1.39 and 1.52, respectively. The structure of the CBE factor for BPA to the lung was also elucidated based on this idea. The factor is described as follows: CBE factor = 0.32 + N/B × 1.80. By this elucidation of the structure of the CBE factor, it is expected that basic and clinical research into boron neutron capture therapy will progress.
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Affiliation(s)
- Koji Ono
- Research Division of Advanced Neutron Therapy, Particle Radiation Oncology Research Center, Kyoto University Research Reactor Institute, 2-1010, Asashironishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
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16
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Digital holographic microscopy for recording and analysis of 3D images of etched tracks in LR-115 SSNTD. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-015-4344-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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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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Hattori Y, Ishimura M, Ohta Y, Takenaka H, Watanabe T, Tanaka H, Ono K, Kirihata M. Detection of boronic acid derivatives in cells using a fluorescent sensor. Org Biomol Chem 2015; 13:6927-30. [PMID: 26022725 DOI: 10.1039/c5ob00753d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The detection of boron-containing compounds requires very expensive facilities and/or tedious sample pretreatments. In an effort to develop a convenient detection method for boronic acid derivatives, boron chelating-ligands were synthesized for use as fluorescent sensors. In this paper, the synthesis and properties of fluorescent sensors for boronic acid derivatives are reported.
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Affiliation(s)
- Yoshihide Hattori
- Research Center of Boron Neutron Capture Therapy, Research Organization for the 21st Century, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Japan.
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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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