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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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Espector N, Portu AM, Espain MS, Leyva G, Saint Martin G. Measurement of an evaporation coefficient in tissue sections as a correction factor for 10B determination. Histochem Cell Biol 2023:10.1007/s00418-023-02200-w. [PMID: 37126141 DOI: 10.1007/s00418-023-02200-w] [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] [Accepted: 04/19/2023] [Indexed: 05/02/2023]
Abstract
Boron neutron capture therapy (BNCT) is a cancer treatment option that combines preferential uptake of a boron compound in tumors and irradiation with thermal neutrons. For treatment planning, the boron concentration in different tissues must be considered. Neutron autoradiography using nuclear track detectors (NTD) can be applied to study both the concentration and microdistribution of boron in tissue samples. Histological sections are obtained from frozen tissue by cryosectioning. When the samples reach room temperature, they undergo an evaporation process, which leads to an increase in the boron concentration. To take this effect into account, certain correction factors (evaporation coefficients, CEv) must be applied. With this aim, a protocol was established to register and analyze mass variation of tissue sections, measured with a semimicro scale. Values of ambient temperature, pressure, and humidity were simultaneously recorded. Reproducible results of evaporation curves and CEv values were obtained for different tissue samples, which allowed the systematization of the procedure. This study could contribute to a more precise determination of boron concentration in tissue samples through the neutron autoradiography technique, which is of great relevance to make dosimetric calculations in BNCT.
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Affiliation(s)
- Natalia Espector
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, San Martin, B1650KNA, Buenos Aires, Argentina
| | - Agustina Mariana Portu
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, San Martin, B1650KNA, Buenos Aires, Argentina.
- Comisión Nacional de Investigaciones Científicas y Técnicas (CONICET), Capital Federal, Buenos Aires, Argentina.
| | - María Sol Espain
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, San Martin, B1650KNA, Buenos Aires, Argentina
- Comisión Nacional de Investigaciones Científicas y Técnicas (CONICET), Capital Federal, Buenos Aires, Argentina
| | - Gabriela Leyva
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, San Martin, B1650KNA, Buenos Aires, Argentina
| | - Gisela Saint Martin
- Departamento de Radiobiología, Comisión Nacional de Energía Atómica (CNEA), Av. General Paz 1499, San Martin, B1650KNA, Buenos Aires, Argentina
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Dai Q, Yang Q, Bao X, Chen J, Han M, Wei Q. The Development of Boron Analysis and Imaging in Boron Neutron Capture Therapy (BNCT). Mol Pharm 2022; 19:363-377. [PMID: 35040321 DOI: 10.1021/acs.molpharmaceut.1c00810] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Boron neutron capture therapy (BNCT) is a selective biological targeted nuclide technique for cancer therapy. It has the following attractive features: good targeting, high effectiveness, and causes slight damage to surrounding healthy tissue compared with other traditional methods. It has been considered as one of the promising methods for the treatment of various cancers. Measuring 10B concentrations is vital for BNCT. However, the existing technology and equipment cannot satisfy the real-time and accurate measurement requirements, and more efficient methods are in demand. The development of methods and imaging applied in BNCT to help measure boron concentration is described in this review.
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Affiliation(s)
- Qi Dai
- Institute of Pharmaceutics, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P.R. China.,Department of Radiation Oncology, Key Laboratory of Cancer Prevention and Intervention, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310058, P.R. China
| | - QiYao Yang
- Department of Radiation Oncology, Key Laboratory of Cancer Prevention and Intervention, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310058, P.R. China
| | - Xiaoyan Bao
- Institute of Pharmaceutics, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P.R. China
| | - Jiejian Chen
- Department of Radiation Oncology, Key Laboratory of Cancer Prevention and Intervention, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310058, P.R. China
| | - Min Han
- Institute of Pharmaceutics, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P.R. China
| | - Qichun Wei
- Department of Radiation Oncology, Key Laboratory of Cancer Prevention and Intervention, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310058, P.R. China
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Miyake Y, Kusaka S, Murata I, Toyoda M. Matrix-Assisted Laser Desorption/Ionization (MALDI) Mass Spectrometry Imaging of L-4-Phenylalanineboronic Acid (BPA) in a Brain Tumor Model Rat for Boron Neutron Capture Therapy (BNCT). Mass Spectrom (Tokyo) 2022; 11:A0105. [PMID: 36713803 PMCID: PMC9853116 DOI: 10.5702/massspectrometry.a0105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 10/19/2022] [Indexed: 11/09/2022] Open
Abstract
Boron neutron capture therapy (BNCT) is a cell-selective particle therapy for cancer using boron containing drugs. Boron compounds are accumulated in high concentration of tens ppm level of boron in target tumors to cause lethal damage to tumor tissue. The examination of boron distribution in target tumor and normal tissue is important to evaluate the efficiency of therapy. The matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging (MSI) is a powerful tool to visualize the distribution of target analyte in biological samples. In this manuscript, we report a trial to visualize the distribution of a typical BNCT drug, L-4-phenylalanine boronic acid (BPA) in a brain tumor model rat using MALDI-MSI technique. We performed a MALDI-MSI with high mass resolution targeting to [BPA+H]+ at m/z 210 in a BPA-treated rat brain section using a spiral orbit-type time of flight (SpiralTOF) mass spectrometer. Several BPA ion species, [BPA+H]+, [BPA-H2O+Na]+, [BPA+DHB-2H2O+Na]+ and [BPA+DHB-2H2O+K]+ were detected separate from peaks originated from biomolecules or matrix reagent by achieving the mass resolving power of approximately 20,000 (full width at half maximum; FWHM) at m/z 210. The mass images with 60 μm spatial resolution obtained from these BPA ion species in a mass window of 0.02 Da revealed their localization in the tumor region. Additionally, the mass image obtained from [BPA+H]+ also likely showed the distribution of BPA inside the tumor. MALDI-MSI with high mass resolution targeting to [BPA+H]+ has a great potential to visualize the distribution of BPA in brain tissue with tumor.
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Affiliation(s)
- Yumi Miyake
- Forefront Research Center, Graduate School of Science, Osaka University, 1–1 Machikaneyama, Toyonaka, Osaka 560–0043, Japan,Correspondence to: Yumi Miyake, Forefront Research Center, Graduate School of Science, Osaka University, 1–1 Machikaneyama, Toyonaka, Osaka 560–0043, Japan, e-mail:
| | - Sachie Kusaka
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, aoka 2–1, Suita, Osaka 565–0871, Japan
| | - Isao Murata
- Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, aoka 2–1, Suita, Osaka 565–0871, Japan
| | - Michisato Toyoda
- Forefront Research Center, Graduate School of Science, Osaka University, 1–1 Machikaneyama, Toyonaka, Osaka 560–0043, Japan,MS open innovation project in JEOL YOKOGUSHI Research Alliance Laboratories, Osaka University, 1–1 Machikaneyama, Toyonaka, Osaka 560–0043, Japan
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Elemental imaging (LA-ICP-MS) of zebrafish embryos to study the toxicokinetics of the acetylcholinesterase inhibitor naled. Anal Bioanal Chem 2018; 411:617-627. [PMID: 30443774 PMCID: PMC6338705 DOI: 10.1007/s00216-018-1471-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/25/2018] [Accepted: 11/02/2018] [Indexed: 12/16/2022]
Abstract
The zebrafish embryo is an important model in ecotoxicology but the spatial distribution of chemicals and the relation to observed effects is not well understood. Quantitative imaging can help to gain insights into the distribution of chemicals in the zebrafish embryo. Laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) is used to quantify the uptake and the uptake kinetics of the bromine (Br) containing organophosphate naled (Dibrom®, dimethyl-1,2-dibromo-2,2-dichloroethylphosphate) and its distribution in zebrafish embryos using Br as the marker element. During exposure, the Br amounts increase in the embryos parallel to the irreversible inhibition of the acetylcholinesterase (AChE). The final amount of Br in the embryo (545 pmol/embryo) corresponds to a 280-fold enrichment of naled from the exposure solution. However, LC-MS/MS analyses showed that the internal concentration of naled remained below the LOD (7.8 fmol/embryo); also the concentration of its known transformation product dichlorvos remained low (0.85 to 2.8 pmol/embryo). These findings indicate the high reactivity and high transformation rate of naled to other products than dichlorvos. 12C normalized intensity distributions of Br in the zebrafish embryo showed an enrichment of Br in its head region. Kernel density estimates of the LA-ICP-MS data were calculated and outline the high reproducibility between replicated and the shift in the Br distribution during exposure. The Br enrichment indicates a preferential debromination or direct covalent reaction of naled with AChE in this region. ᅟ ![]()
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Lobo L, Pereiro R, Fernández B. Opportunities and challenges of isotopic analysis by laser ablation ICP-MS in biological studies. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.05.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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