1
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Yamaguchi H, Takahashi F, Kurogi T, Yorimitsu H. Reductive anti-Dizincation of Arylacetylenes. Chem Asian J 2024:e202400384. [PMID: 38647096 DOI: 10.1002/asia.202400384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 04/22/2024] [Accepted: 04/22/2024] [Indexed: 04/25/2024]
Abstract
Arylacetylenes undergo anti-1,2-dizincation to afford trans-1,2-dizincioalkenes. The process employs sodium dispersion as a reducing agent and zinc chloride TMEDA complex as a reduction-resistant zinc electrophile. This reductive anti-dizincation contrasts with the conventional additive syn-dimetalation like silylzincation. The resulting dizincated alkenes undergo the cross-coupling to yield multi-substituted alkenes stereoselectively.
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Affiliation(s)
- Haruka Yamaguchi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Takashi Kurogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
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2
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Fukazawa M, Takahashi F, Kurogi T, Yorimitsu H. Sodium-Mediated Reductive C-C Bond Cleavage Assisted by Boryl Groups. Chem Asian J 2024; 19:e202400100. [PMID: 38385830 DOI: 10.1002/asia.202400100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 02/22/2024] [Accepted: 02/22/2024] [Indexed: 02/23/2024]
Abstract
In contrast to the well-established oxidative C=C double bond cleavage to give the corresponding carbonyl compounds, little is known about reductive C=C double bond cleavage. Here we report that C-C single bond cleavage in 1,2-diaryl-1,2-diborylethanes proceeds by reduction with sodium metal to yield α-boryl benzylsodium species. In combination with our previous reductive diboration of stilbenes, the overall transformation represents reductive cleavage of the C=C double bonds of stilbene to yield α-boryl-α-sodiated toluenes. This reductive two-step C=C double bond cleavage is applicable to ring-opening or ring-expansion reactions of polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Mizuki Fukazawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Sakyo-ku, 606-8502 Kyoto, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Sakyo-ku, 606-8502 Kyoto, Japan
| | - Takashi Kurogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Sakyo-ku, 606-8502 Kyoto, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Sakyo-ku, 606-8502 Kyoto, Japan
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3
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Takahashi F, Baba T, Christianto A, Yanai S, Lee-Okada HC, Ishiwata K, Nakabayashi K, Hata K, Ishii T, Hasegawa T, Yokomizo T, Choi MH, Morohashi KI. Development of sexual dimorphism of skeletal muscles through the adrenal cortex, caused by androgen-induced global gene suppression. Cell Rep 2024; 43:113715. [PMID: 38306273 DOI: 10.1016/j.celrep.2024.113715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 12/08/2023] [Accepted: 01/11/2024] [Indexed: 02/04/2024] Open
Abstract
The zona fasciculata (zF) in the adrenal cortex contributes to multiple physiological actions through glucocorticoid synthesis. The size, proliferation, and glucocorticoid synthesis characteristics are all female biased, and sexual dimorphism is established by androgen. In this study, transcriptomes were obtained to unveil the sex differentiation mechanism. Interestingly, both the amount of mRNA and the expressions of nearly all genes were higher in females. The expression of Nr5a1, which is essential for steroidogenic cell differentiation, was also female biased. Whole-genome studies demonstrated that NR5A1 regulates nearly all gene expression directly or indirectly. This suggests that androgen-induced global gene suppression is potentially mediated by NR5A1. Using Nr5a1 heterozygous mice, whose adrenal cortex is smaller than the wild type, we demonstrated that the size of skeletal muscles is possibly regulated by glucocorticoid synthesized by zF. Taken together, considering the ubiquitous presence of glucocorticoid receptors, our findings provide a pathway for sex differentiation through glucocorticoid synthesis.
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Affiliation(s)
- Fumiya Takahashi
- Department of Systems Life Sciences, Graduate School of Systems Life Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Baba
- Department of Systems Life Sciences, Graduate School of Systems Life Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - Antonius Christianto
- Department of Systems Life Sciences, Graduate School of Systems Life Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Shogo Yanai
- Department of Systems Life Sciences, Graduate School of Systems Life Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Hyeon-Cheol Lee-Okada
- Department of Biochemistry, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Keisuke Ishiwata
- Department of Maternal-Fetal Biology, Research Institute, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-0074, Japan
| | - Kazuhiko Nakabayashi
- Department of Maternal-Fetal Biology, Research Institute, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-0074, Japan
| | - Kenichiro Hata
- Department of Maternal-Fetal Biology, Research Institute, National Center for Child Health and Development, 2-10-1 Okura, Setagaya-ku, Tokyo 157-0074, Japan; Department of Human Molecular Genetics, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan
| | - Tomohiro Ishii
- Department of Pediatrics, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Tomonobu Hasegawa
- Department of Pediatrics, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Takehiko Yokomizo
- Department of Biochemistry, Juntendo University Graduate School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Man Ho Choi
- Center for Advanced Biomolecular Recognition, Korea Institute of Science and Technology, Seoul 02792, Korea
| | - Ken-Ichirou Morohashi
- Department of Systems Life Sciences, Graduate School of Systems Life Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; Department of Internal Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
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4
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Mato M, Bruzzese PC, Takahashi F, Leutzsch M, Reijerse EJ, Schnegg A, Cornella J. Oxidative Addition of Aryl Electrophiles into a Red-Light-Active Bismuthinidene. J Am Chem Soc 2023; 145:18742-18747. [PMID: 37603853 PMCID: PMC10472430 DOI: 10.1021/jacs.3c06651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Indexed: 08/23/2023]
Abstract
The oxidative addition of aryl electrophiles is a fundamental organometallic reaction widely applied in the field of transition metal chemistry and catalysis. However, the analogous version based on main group elements still remains largely underexplored. Here, we report the ability of a well-defined organobismuth(I) complex to undergo formal oxidative addition with a wide range of aryl electrophiles. The process is facilitated by the reactivity of both the ground and excited states of N,C,N-bismuthinidenes upon absorption of low-energy red light.
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Affiliation(s)
- Mauro Mato
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Paolo Cleto Bruzzese
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, Mülheim an der Ruhr 45470, Germany
| | - Fumiya Takahashi
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Markus Leutzsch
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Edward J. Reijerse
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, Mülheim an der Ruhr 45470, Germany
| | - Alexander Schnegg
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, Mülheim an der Ruhr 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut
für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
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5
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Takahashi F, Yorimitsu H. Stereoselective Synthesis of Tetraarylethylenes Enabled by Reductive anti-1,2-Dimetallation of Alkynes. Chemistry 2023; 29:e202203988. [PMID: 36808167 DOI: 10.1002/chem.202203988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/24/2023] [Accepted: 02/20/2023] [Indexed: 02/22/2023]
Abstract
Tetraarylethylenes (TAEs) have been gaining attention from various scientific disciplines for their characteristic chemical and physical properties. From the synthetic perspective, however, efficient methods for the selective synthesis of different isomers of TAEs are still underdeveloped. Here, we report the regio- and stereoselective synthesis of TAEs by means of sodium-promoted reductive anti-1,2-dimagnesiation of alkynes. Subsequent transmetallation to zinc generates trans-1,2-dizincioalkenes, which underwent the stereoselective arylation under a palladium catalysis to afford a variety of TAEs that had been difficult to prepare according to the conventional procedures. In addition, the present method accommodates not only diarylacetylenes but also alkyl aryl acetylenes and thus enables to synthesize a wide range of all-carbon tetrasubstituted alkenes.
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Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, 606-8502, Kyoto, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, 606-8502, Kyoto, Japan
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6
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Koyama S, Takahashi F, Saito H, Yorimitsu H. Borylation of Alkenyl Carbamates by Means of Sodium Metal. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1970-4584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Treatment of alkenyl carbamates with sodium dispersion and a co-existing boron electrophile affords alkenylboronates via the reductive cleavage of the vinylic C−O bond. The key to this borylation is an instant trapping of reactive organosodium species with the co-existing boron electrophile.
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Affiliation(s)
- Shunsuke Koyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
| | - Hayate Saito
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
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7
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Inoue M, Baba T, Takahashi F, Terao M, Yanai S, Shima Y, Saito D, Sugihara K, Miura T, Takada S, Suyama M, Ohkawa Y, Morohashi KI. Tmsb10 triggers fetal Leydig differentiation by suppressing the RAS/ERK pathway. Commun Biol 2022; 5:974. [PMID: 36109592 PMCID: PMC9478096 DOI: 10.1038/s42003-022-03941-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 09/02/2022] [Indexed: 11/24/2022] Open
Abstract
Leydig cells in fetal testes play crucial roles in masculinizing fetuses through androgen production. Gene knockout studies have revealed that growth factors are implicated in fetal Leydig cell (FLC) differentiation, but little is known about the mechanisms regulating this process. We investigate this issue by characterizing FLC progenitor cells using single-cell RNA sequencing. The sequence datasets suggest that thymosin β10 (Tmsb10) is transiently upregulated in the progenitors. While studying the function of Tmsb10, we reveal that platelet-derived growth factor (PDGF) regulates ciliogenesis through the RAS/ERK and PI3K/AKT pathways, and thereby promotes desert hedgehog (DHH)-dependent FLC differentiation. Tmsb10 expressed in the progenitor cells induces their differentiation into FLCs by suppressing the RAS/ERK pathway. Through characterizing the transiently expressed Tmsb10 in the FLC progenitors, this study unveils the molecular process of FLC differentiation and shows that it is cooperatively induced by DHH and PDGF. Investigation of fetal Leydig progenitors shows that thymosin β10 (Tmsb10) suppresses the RAS/ERK pathway, inducing progenitor differentiation into fetal Leydig cells.
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8
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Ishimaru Y, Takahashi F, Mochizuki S, Hosoda N, Fujihara T. Cover Feature:
Syn
and
Anti
Metal Complexes of 24π Antiaromatic Bis(Dicarbonylrhodium(I))Dithiaamethyrin (Chem. Asian J. 14/2022). Chem Asian J 2022. [DOI: 10.1002/asia.202200523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yoshihiro Ishimaru
- Division of Material Science Graduate School of Science and Engineering Saitama University 255 Shimo-ohkubo, Sakura-ku 338-8570 Saitama City Saitama Japan
| | - Fumiya Takahashi
- Division of Material Science Graduate School of Science and Engineering Saitama University 255 Shimo-ohkubo, Sakura-ku 338-8570 Saitama City Saitama Japan
| | - Samu Mochizuki
- Division of Material Science Graduate School of Science and Engineering Saitama University 255 Shimo-ohkubo, Sakura-ku 338-8570 Saitama City Saitama Japan
| | - Natsuki Hosoda
- Division of Material Science Graduate School of Science and Engineering Saitama University 255 Shimo-ohkubo, Sakura-ku 338-8570 Saitama City Saitama Japan
| | - Takashi Fujihara
- Research and Development Bureau Comprehensive Analysis Center for Science Saitama University 255 Shimo-ohkubo, Sakura-ku 338-8570 Saitama City Saitama Japan
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9
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Iida M, Nguyen HT, Takahashi F, Bak SM, Kanda K, Iwata H. Effects of exposure to oxytetracycline on the liver proteome of red seabream (Pagrus major) in a real administration scenario. Comp Biochem Physiol C Toxicol Pharmacol 2022; 256:109325. [PMID: 35272040 DOI: 10.1016/j.cbpc.2022.109325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 02/22/2022] [Accepted: 03/01/2022] [Indexed: 11/25/2022]
Abstract
Oxytetracycline (OTC) is a widely used antibiotic in aquaculture. In this study, red seabream (Pagrus major), the most popular aquaculture species in Japan, were treated with OTC mimicking a real administration scenario in aquaculture. The treatment groups were as follows: no OTC, 40 mg/kg body wt/day (equivalent to the dose used in actual aquaculture), or 178 mg/kg body wt/day. The first exposure was conducted for a week (1st OTC exposure period), followed by a 4-week interval, and the second exposure was for one week (2nd OTC exposure period). We investigated the effects of OTC on the liver proteome with the isobaric tags for relative and absolute quantitation (iTRAQ) technology accompanied by liquid chromatography and mass spectrometry. The pathway and disease enrichment analyses of differentially abundant proteins in OTC-exposed groups compared to their respective controls showed that the abundance of proteins related to the immune and nervous systems was altered after the 1st and 2nd OTC exposures, respectively. Quantitative real-time PCR of the transcripts of immune-related genes corroborated with the results of proteome analysis. OTC exposure also modulated the expression of metabolism-related proteins after the 1st and 2nd OTC exposures. Furthermore, after four weeks of the 2nd exposure, weight loss and changes in the expression of proteins related to metabolism were observed, suggesting that OTC exposure disrupts the metabolic system and causes growth inhibition. Based on these results, we suggest that the use of OTC in aquaculture poses a health risk in fish species. Thus, we need to pay more attention to the contamination with OTC in aquaculture.
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Affiliation(s)
- Midori Iida
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan; Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, Iizuka 680-4, Fukuoka 820-8502, Japan
| | - Hoa Thanh Nguyen
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
| | - Fumiya Takahashi
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
| | - Su-Min Bak
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
| | - Kazuki Kanda
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan
| | - Hisato Iwata
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan.
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10
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Ishimaru Y, Takahashi F, Mochizuki S, Hosoda N, Fujihara T. syn and anti Metal Complexes of 24π Antiaromatic Bis(dicarbonylrhodium(I))dithiaamethyrin. Chem Asian J 2022; 17:e202200198. [PMID: 35514150 DOI: 10.1002/asia.202200198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/25/2022] [Indexed: 11/08/2022]
Abstract
From the reaction of sterically less hindered tetrapropyl[24]dithiaamethyrin(1.0.0.1.0.0) 5, with [Rh(CO)2Cl]2, a unique anti form of the bis(dicarbonylrhodium(I)) complex (6-anti), where two rhodium ions are on the opposite faces of the macrocyclic ligand, was isolated for the first time in 12% yield along with the corresponding syn isomer (6-syn, 61% yield). These structures were characterized in detail by single-crystal X-ray structure analysis. Compound 6-syn exhibited a bowl-shaped structure with the two rhodium atoms separated by a distance of ~4.5 Å. In contrast, 6-anti contained a wave-shaped macrocycle with a distance of ~5.3 Å between the two rhodium atoms. Furthermore, the 1H nuclear magnetic resonance spectra and density functional theory calculation results revealed that 6-anti had a stronger paratropic ring current and a more planar structure than 6-syn. The isolation of both 6-anti and 6-syn enabled the structure-property relationship to be discussed in detail.
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Affiliation(s)
- Yoshihiro Ishimaru
- Saitama University, Division of Material Science,Graduate School of Science and Engineering, 255 Shimo-ohkubo, Sakura-ku,, 3388570, Saitama, JAPAN
| | - Fumiya Takahashi
- Saitama University: Saitama Daigaku, Graduate School of Science and Engineering, JAPAN
| | - Samu Mochizuki
- Saitama University: Saitama Daigaku, Graduate School of Science and Engineering, JAPAN
| | - Natsuki Hosoda
- Saitama University: Saitama Daigaku, Graduate School of Science and Engineering, JAPAN
| | - Takashi Fujihara
- Saitama University: Saitama Daigaku, Comprehensive Analysis Center for Science, JAPAN
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11
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Koyama S, Takahashi F, Saito H, Yorimitsu H. Reductive Cleavage of Propargylic Ethers with Alkali Metal: Application to the Synthesis of Allenylboronates. Org Lett 2021; 23:8590-8594. [PMID: 34694816 DOI: 10.1021/acs.orglett.1c03316] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Treatment of propargylic ethers with sodium dispersion in the presence of lithium iodide results in the generation of the corresponding carbanion species via cleavage of the propargylic C-O bond. The anionic species react with trimethoxyborane to yield the allenylboronates including highly substituted ones that are difficult to synthesize.
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Affiliation(s)
- Shunsuke Koyama
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hayate Saito
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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12
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Abstract
Sodium dispersion promotes the reductive borylation of polycyclic aromatic hydrocarbons (PAHs) with MeOBpin. Anthracenes and phenanthrenes are converted to the corresponding dearomatized diborylated products. The reductive diborylation of naphthalene-based small π-systems yields similar yet unstable products that are oxidized into formal C-H borylation products with unique regioselectivity. Pyrene is converted to 1-borylpyrene without the addition of an oxidant. The latter two reactions represent a new route to useful borylated PAHs that rivals C-X borylation and catalytic C-H borylation.
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Affiliation(s)
- Mizuki Fukazawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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13
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Affiliation(s)
- Shiori Ito
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Fumiya Takahashi
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Hideki Yorimitsu
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
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14
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Ito S, Fukazawa M, Takahashi F, Nogi K, Yorimitsu H. Sodium-Metal-Promoted Reductive 1,2-syn-Diboration of Alkynes with Reduction-Resistant Trimethoxyborane. BCSJ 2020. [DOI: 10.1246/bcsj.20200110] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Shiori Ito
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Mizuki Fukazawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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15
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Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
| | - Keisuke Nogi
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
| | - Hideki Yorimitsu
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
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16
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Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
| | - Keisuke Nogi
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
| | - Hideki Yorimitsu
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo-ku 606-8502 Kyoto Japan
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17
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Fukazawa M, Takahashi F, Nogi K, Sasamori T, Yorimitsu H. Reductive Difunctionalization of Aryl Alkenes with Sodium Metal and Reduction-Resistant Alkoxy-Substituted Electrophiles. Org Lett 2020; 22:2303-2307. [DOI: 10.1021/acs.orglett.0c00490] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mizuki Fukazawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takahiro Sasamori
- Graduate School of Natural Sciences, Nagoya City University, Yamanohata 1, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8501, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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Takamochi K, Hayashi T, Hara K, Mitsuishi Y, Takahashi F, Suehara Y, Suzuki K. Nrf2 expression in surgically resected lung adenocarcinomas: Its association with clinicopathologic features and driver oncogene alterations. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz413.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Takahashi F, Nogi K, Sasamori T, Yorimitsu H. Diborative Reduction of Alkynes to 1,2-Diboryl-1,2-Dimetalloalkanes: Its Application for the Synthesis of Diverse 1,2-Bis(boronate)s. Org Lett 2019; 21:4739-4744. [DOI: 10.1021/acs.orglett.9b01622] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takahiro Sasamori
- Graduate School of Natural Sciences, Nagoya City University, Yamanohata 1, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8501, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan
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Yokoyama C, Chigi Y, Baba T, Ohshitanai A, Harada Y, Takahashi F, Morohashi KI. Three populations of adult Leydig cells in mouse testes revealed by a novel mouse HSD3B1-specific rat monoclonal antibody. Biochem Biophys Res Commun 2019; 511:916-920. [PMID: 30851938 DOI: 10.1016/j.bbrc.2019.02.100] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 02/20/2019] [Indexed: 11/25/2022]
Abstract
Leydig cells play a pivotal function in the synthesis of a male sex steroid, testosterone. The ability of the steroid production is dependent on the expression of the steroidogenic genes, such as HSD3B (3β-hydroxysteroid dehydrogenase/Δ5- Δ4 isomerase). It has been established that two different types of Leydig cells, fetal Leydig cells (FLCs) and adult Leydig cells (ALCs), are developed in mammalian testes. FLCs and ALCs are characterized by different sets of marker gene expression. In the case of mouse Leydig cells, Hsd3b1 (Hsd3b type 1) is expressed both in FLCs and ALCs whereas Hsd3b6 (Hsd3b type 6) is expressed in ALCs but not in FLCs. However, because the antibodies established so far for HSD3B were unable to distinguish between the HSD3B1 and HSD3B6 isoforms, it remained unclear whether both of them are expressed in every ALC. Therefore, in the present study, we generated a rat monoclonal antibody specific for mouse HSD3B1. Intriguingly, this monoclonal antibody together with an antibody specific for HSD3B6 identified three populations of ALCs based on the expression levels of these HSD3Bs.
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Affiliation(s)
- Chikako Yokoyama
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, 992-8510, Japan.
| | - Yuta Chigi
- Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, 812-8582, Japan; Division of Medical Molecular Cell Biology, Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Takashi Baba
- Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, 812-8582, Japan; Division of Medical Molecular Cell Biology, Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Atsushi Ohshitanai
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, 992-8510, Japan
| | - Yumi Harada
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, 992-8510, Japan
| | - Fumiya Takahashi
- Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, 812-8582, Japan; Division of Medical Molecular Cell Biology, Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, 812-8582, Japan
| | - Ken-Ichirou Morohashi
- Department of Molecular Biology, Graduate School of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, 812-8582, Japan; Division of Medical Molecular Cell Biology, Graduate School of Systems Life Sciences, Kyushu University, Fukuoka, 812-8582, Japan
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Takahashi F, Nogi K, Yorimitsu H. Intramolecular Desulfitative Coupling: Nickel-Catalyzed Transformation of Diaryl Sulfones into Biaryls via Extrusion of SO2. Org Lett 2018; 20:6601-6605. [DOI: 10.1021/acs.orglett.8b02972] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Fumiya Takahashi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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Miyaji K, Nakae K, Iwao T, Takahashi F, Watanabe R, Katada A. An Attempt to Assess the Processing of Verbs by the Simultaneous Measurements of ERPs and NIRS. Int J Psychophysiol 2018. [DOI: 10.1016/j.ijpsycho.2018.07.319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Suda S, Takamizawa T, Takahashi F, Tsujimoto A, Akiba S, Nagura Y, Kurokawa H, Miyazaki M. Application of the Self- Assembling Peptide P11-4 for Prevention of Acidic Erosion. Oper Dent 2018. [PMID: 29513639 DOI: 10.2341/17-175-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to use ultrasonography to evaluate the effect of the self-assembling peptide P11-4 on acid erosion prevention. Curodont Repair (CR), which includes peptide P11-4, was used. Rectangular prisms of bovine enamel (4×1×1 mm) were immersed in pure orange juice for a period of 5 minutes six times per day for 28 days. These samples were divided into four groups of six specimens each and treated differently for an additional period of 28 days: 1) baseline group specimens were stored in artificial saliva; 2) CR group specimens were exposed to curodont without acid challenge; 3) NCRA (no curodont+acid challenge) specimens were treated with orange juice without curodont exposure; and 4) CRA (CR+acid challenge) specimens were treated with curodont before treatment with orange juice. The propagation time of longitudinal ultrasonic velocity (UV) was measured. Ultrastructural observation of each tested enamel surface was carried out using field-emission scanning electron microscopy (SEM). The UV data were analyzed using two-way analysis of variance with time and treatment as confounding factors. Post hoc pairwise tests among groups were performed using the Tukey honestly significant difference test. The average UV in intact bovine enamel for the baseline group ranged from 4,483 to 4,549 m/s and did not vary significantly within the test period. The average ultrasonic velocity (UV) in all samples decreased after the initial erosion. The UV in NCRA decreased further over time. Increased UVs were found for CR and CRA. For CR and CRA, there was no significant difference in UV at the end of the experiment from the initial value before erosion. In the results of SEM observation, the CR and CRA groups had similar morphologic features in that etching patterns were not clearly due to precipitation between the enamel rods. From the results of this in vitro study, it might be concluded that applying enamel matrix derivatives and self-assembling peptides on erosive lesions can improve remineralization.
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Wirawan A, Tajima K, Takahashi F, Hidayat M, Kanemaru R, Koinuma Y, Hayakawa D, Tajima M, Matsumoto N, Kanamori K, Takeda I, Kato M, Kobayashi I, Shimada N, Takahashi K. P2.02-012 The Epigenetic Role of LSD1+8a in Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hidayat M, Takahashi F, Tajima K, Nurwidya F, Wirawan A, Kanemaru R, Koinuma Y, Ihara H, Tajima M, Matsumoto N, Kanamori K, Takeda I, Haraguchi M, Hayakawa D, Ko R, Kato M, Shibayama R, Koyama R, Takahashi M, Shimada N, Takahashi K. P3.02-024 Role of FBXW7 in the Maintenance of Quiescent Cancer Stem Cells Resistant to Gefitinib in EGFR Mutation-Positive Non-Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nurwidya F, Takahashi F, Hidayat M, Kobayashi I, Wirawan A, Kato M, Tajima K, Shimada N, Takeda I, Tajima M, Matsumoto N, Kanemori K, Koinuma Y, Yunus F, Andarini S, Takahashi K. P1.02-065 Histone Deacetylase Inhibition Alters Stem Cell Phenotype in Gefitinib-Resistant Lung Cancer Cells with EGFR Mutation. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Takamochi K, Suehara Y, Takahashi F, Mogushi K, Kohsaka S, Mano H, Takeuchi K, Saito T, Hayashi T, Takahashi K, Suzuki K. Practical screening system of oncogenic driver fusions in lung adenocarcinoma, using the NanoString nCounter. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx508.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Babushok VI, Linteris GT, Katta VR, Takahashi F. Influence of Hydrocarbon Moiety of DMMP on Flame Propagation in Lean Mixtures. Combust Flame 2016; 171:10.1016/j.combustflame.2016.06.019. [PMID: 30983597 PMCID: PMC6459210 DOI: 10.1016/j.combustflame.2016.06.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Phosphorus-containing compounds (PCCs) have been found to be significantly more effective than CF3Br for reducing burning velocity when added to stoichiometric hydrocarbon-air flames. However, when added to lean flames, DMMP (dimethylmethylphosphonate) is predicted to increase the burning velocity. The addition of DMMP to lean mixtures apparently increases the equivalence ratio (fuel/oxidizer) and the combustion temperature, as a result of hydrocarbon content of DMMP molecule. Premixed flames studies with added DMMP, OP(OH)3, and CF3Br are used to understand the different behavior with varying equivalence ratio and agent loading. Decrease of the equivalence ratio leads to the decrease of inhibition effectiveness of PCCs relative to bromine-containing compounds. For very lean mixtures CF3Br becomes more effective inhibitor than PCCs. Calculations of laminar burning velocities for pure DMMP/air mixtures predict the maximum burning velocity of 10.5 cm/s at 4.04 % of DMMP in air and at an initial temperature of 400 K. Adiabatic combustion temperature is 2155 K at these conditions.
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Affiliation(s)
- V I Babushok
- National Institute of Standards and Technology, Gaithersburg, MD
| | - G T Linteris
- National Institute of Standards and Technology, Gaithersburg, MD
| | - V R Katta
- Innovative Scientific Solutions, Inc., Dayton, OH
| | - F Takahashi
- Case Western Reserve University, Cleveland, OH
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Takamochi K, Suehara Y, Mogushi K, Kohsaka S, Mano H, Takeuchi K, Saito T, Suzuki K, Ladanyi M, Takahashi K, Takahashi F. 3014 Comprehensive analyses of oncogenic driver fusions using the NanoString nCounter in lung adenocarcinoma from Japanese never- and light-smokers. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31658-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Harano K, Terauchi F, Katsumata N, Takahashi F, Yasuda M, Takakura S, Takano M, Yamamoto Y, Sugiyama T. Quality-of-life outcomes from a randomized phase III trial of dose-dense weekly paclitaxel and carboplatin compared with conventional paclitaxel and carboplatin as a first-line treatment for stage II-IV ovarian cancer: Japanese Gynecologic Oncology Group Trial (JGOG3016). Ann Oncol 2014; 25:251-7. [PMID: 24356636 DOI: 10.1093/annonc/mdt527] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Dose-dense weekly paclitaxel (Taxol) and carboplatin (dd-TC) improved survival compared with conventional tri-weekly paclitaxel and carboplatin (c-TC) as a first-line chemotherapy for newly diagnosed stage II-IV ovarian cancer in the Japanese Gynecologic Oncology Group 3016 trial. We report the quality-of-life (QoL) results from this trial. PATIENTS AND METHODS A total of 637 patients were randomly assigned to receive c-TC or dd-TC (c-TC, n = 319; dd-TC, n = 312) and were asked to complete a QoL assessment at baseline, just after the third and sixth chemotherapy cycles, and at 12 months after randomization. QoL was assessed using Functional Assessment of Cancer Therapy (FACT)-general (FACT-G), FACT-taxane subscale (FACT-T), and FACT-ovary subscale (FACT-Ov). The overall QoL and that according to each subscale were analyzed using mixed-effects models adjusted for treatment and time. RESULTS Baseline QoL assessment was completed by 204 out of 319 (63.9%) and 200 out of 312 (64.1%) patients in the c-TC and dd-TC groups, respectively. In these groups, the compliance rates with regard to QoL assessment were 74.5% and 73.0%, respectively, after three chemotherapy cycles; 86.8% and 86.9%, respectively, after six chemotherapy cycles; and 74.2% and 71.6%, respectively, at 12 months after randomization. The overall QoL did not differ significantly between the two treatment groups up to 12 months after randomization (P = 0.46). However, QoL according to the FACT-T subscale was significantly lower in the dd-TC group than in the c-TC group (P = 0.02). CONCLUSION dd-TC does not decrease overall QoL compared with c-TC.
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Affiliation(s)
- K Harano
- Department of Medical Oncology, Nippon Medical School Musashikosugi Hospital, Kawasaki
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Ohno S, Chow LWC, Sato N, Masuda N, Sasano H, Takahashi F, Bando H, Iwata H, Morimoto T, Kamigaki S, Nakayama T, Nakamura S, Kuroi K, Aogi K, Kashiwaba M, Yamashita H, Hisamatsu K, Ito Y, Yamamoto Y, Ueno T, Fakhrejahani E, Yoshida N, Toi M. Randomized trial of preoperative docetaxel with or without capecitabine after 4 cycles of 5-fluorouracil– epirubicin–cyclophosphamide (FEC) in early-stage breast cancer: exploratory analyses identify Ki67 as a predictive biomarker for response to neoadjuvant chemotherapy. Breast Cancer Res Treat 2014; 142:69-80. [PMID: 24122389 PMCID: PMC3825616 DOI: 10.1007/s10549-013-2691-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 08/29/2013] [Indexed: 11/05/2022]
Abstract
This randomized, multicenter study compared the efficacy of docetaxel with or without capecitabine following fluorouracil/epirubicin/cyclophosphamide (FEC) therapy in operable breast cancer and investigated the role of Ki67 as a predictive biomarker. Patients were randomized to 4 cycles of docetaxel/capecitabine (docetaxel: 75 mg/m2 on day 1; capecitabine: 1,650 mg/m2 on days 1–14 every 3 weeks) or docetaxel alone (75 mg/m2 on day 1 every 3 weeks) after completion of 4 cycles of FEC (5-fluorouracil 500 mg/m2, epirubicin 100 mg/m2 and cyclophosphamide 500 mg/m2 on day 1 every 3 weeks). The primary endpoint was the pathological complete response (pCR) rate. Predictive factor analysis was conducted using clinicopathological markers, including hormone receptors and Ki67 labeling index (Ki67LI). A total of 477 patients were randomized; the overall response in the docetaxel/capecitabine and docetaxel groups was 88.3 and 87.4 %, respectively. There were no significant differences in the pCR rate (docetaxel/capecitabine: 23 %; docetaxel: 24 %; p = 0.748), disease-free survival, or overall survival. However, patients with mid-range Ki67LI (10–20 %) showed a trend towards improved pCR rate with docetaxel/capecitabine compared to docetaxel alone. Furthermore, multivariate logistic regression analysis showed pre-treatment Ki67LI (odds ratio 1.031; 95 % CI 1.014–1.048; p = 0.0004) to be a significant predictor of pCR in this neoadjuvant treatment setting. Docetaxel/capecitabine (after 4 cycles of FEC) did not generate significant improvement in pCR compared to docetaxel alone. However, exploratory analyses suggested that assessment of pre-treatment Ki67LI may be a useful tool in the identification of responders to preoperative docetaxel/capecitabine in early-stage breast cancer.
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Tsutsui T, Hori T, Takahashi F, Concannon PW. Ovulation compensatory function after unilateral ovariectomy in dogs. Reprod Domest Anim 2013; 47 Suppl 6:43-6. [PMID: 23279463 DOI: 10.1111/rda.12075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 07/02/2012] [Indexed: 11/29/2022]
Abstract
As a step towards elucidation of the timing and mechanism of the determination of the number of ovulated ova in dogs, we excised one ovary 2, 5 and 8 days after the beginning of vulval bleeding and examined whether the lost ovulation function, assessed by estimating the number of ovulated oocytes, would be compensated for by the remaining ovary. The number of ovulated ova was maintained by the remaining ovary in the group that underwent unilateral ovariectomy 2 days after the beginning of vulval bleeding. However, in the groups ovariectomized 5 or 8 days after the beginning of vulval bleeding, no compensation for the number of ova that would have been ovulated from the lost ovary was observed; ova were ovulated only from the follicles 3 mm or greater in diameter observed in the remaining ovary at unilateral ovariectomy. Thus, in dogs, the number of ovulated ova is considered to be determined within 5 days after the beginning of vulval bleeding.
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Affiliation(s)
- T Tsutsui
- International Institute of Small Animal Medicine, Bio Plus, AHB Inc, Tokyo, Japan.
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Toi M, Ohno S, Sato N, Masuda N, Sasano H, Takahashi F, Bando H, Iwata H, Morimoto T, Kamigaki S, Nakayama T, Murakami S, Nakamura S, Kuroi K, Aogi K, Kashiwaba M, Yamashita H, Hisamatsu K, Ito Y, Yamamoto Y, Ueno T, Fakhrejahani E, Yoshida N, Chow LWC. Abstract P1-14-02: Preoperative docetaxel (T) with or without capecitabine (X) following epirubicin, 5-fluorouracil and cyclophosphamide (FEC) in patients with operable breast cancer (OOTR N003): Results of comparative study and predictive marker analysis. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p1-14-02] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Objective: This preoperative study aimed to evaluate the efficacy of 4 cycles of TX compared with 4 cycles of T, following 4 cycles of FEC in operable breast cancer patients.
Methods: Women with operable breast cancer (T1C-3N0M0/T1-3N1M0) were randomly assigned to receive either T (75 mg/m2, q3) plus X (825 mg/m2 bid, days 1 to 14) or T alone (75 mg/m2, q3) after completion of FEC (5-fluorouracil 500 mg/m2, epirubicin 100 mg/m2, cyclophosphamide 500 mg/m2, q3). Patients who had disease progression on FEC were excluded from randomization. The primary endpoint was pathological complete response (pCR). Predictive factor analysis was conducted using clinicopathological markers such as hormone receptors, Ki67 labeling index (Ki67LI) and thymidine phosphorylase (TP).
Results: From November 2005 to October 2009, 504 patients were enrolled and 239 and 238 patients were assigned to TX and T group, respectively (median age 49 years, median tumor size 3.5 cm and node positive rate 56%). Treatment discontinuation was observed in 22% of TX group and 5% in T group (p < 0.0001). The major reasons for discontinuation were toxicity, refusal/ consent withdrawal and several others. No significant difference in pCR rate was shown between the two groups (TX 23% and T 24%, p = 0.748). Neither clinical response nor surgical outcome differed between TX and T. The pCR rate in patients who had therapy discontinuation or dose-reduction on TX was 23%, whereas pCR rate in those on T was 11%. A subpopulation treatment effect pattern plots method indicated a trend that TX may improve the pCR rate in patients having a middle range of pretreatment Ki67LI, such as 10%–20%. In the median follow-up time of 3.7 years, disease-free survival (DFS) was not different between TX and T (3-year DFS: 92% in TX and 91% in T; hazard ratio 0.907, 95%CI 0.528–1.557, p = 0.723). The frequency of major grade 3 or greater adverse events of TX and T were leukopenia, 36% and 34%, febrile neutropenia 8% and 5%, and hand-foot syndrome 15% and 2%, respectively.
According to the analysis for evaluating predictive values of biomarkers, a multivariate logistic regression analysis showed that HER2 (+/−: odds ratio 4.107, p < 0.0001), Ki67LI (continuous variables: 1.029, p = 0.003), hormone receptor status (+/−: 0.457, p = 0.009), stroma TP status (0.523, p = 0.02) and grade (1/3: 0.387, 2/3: 0.532, p = 0.047) had statistical significant values for predicting pCR. A multiple Cox model in landmark analysis showed that tumor size (p < 0.0001), cancer cell TP status (p = 0.005), pCR and posttreatment Ki67LI (p = 0.016), and age (p = 0.049) were associated with DFS significantly.
Conclusions: Addition of X to T showed no superiority to T alone following FEC in neoadjuvant treatment of these patients with operable breast cancer. Treatment discontinuation rate was significantly higher in TX than T group, however the pCR rate in patients in TX group who required treatment discontinuation or dose-reduction was similar to that in patients who completed as scheduled, which was different from T group. Determination of pre-/ post-treatment Ki67LI looks useful for predicting pCR and DFS.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P1-14-02.
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Affiliation(s)
- M Toi
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - S Ohno
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - N Sato
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - N Masuda
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - H Sasano
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - F Takahashi
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - H Bando
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - H Iwata
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - T Morimoto
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - S Kamigaki
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - T Nakayama
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - S Murakami
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - S Nakamura
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - K Kuroi
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - K Aogi
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - M Kashiwaba
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - H Yamashita
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - K Hisamatsu
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - Y Ito
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - Y Yamamoto
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - T Ueno
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - E Fakhrejahani
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - N Yoshida
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
| | - LWC Chow
- Organisation for Oncology and Translational Research (OOTR), Kyoto, Japan
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Miyaji K, Kasuga K, Takahashi F. Psychological effects of human interaction in mahjong: A heart-rate study. Int J Psychophysiol 2012. [DOI: 10.1016/j.ijpsycho.2012.06.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Takahashi F, Sun ZR, Fukushi K, Oshima Y, Yamamoto K. Enhanced removal of sodium salts supported by in-situ catalyst synthesis in a supercritical water oxidation process. Water Sci Technol 2012; 65:2034-2041. [PMID: 22592475 DOI: 10.2166/wst.2012.109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
For practical applications of supercritical water oxidation to wastewater treatment, the deposition of inorganic salts in supercritical phase must be controlled to prevent a reactor from clogging. This study investigated enhanced removal of sodium salts with titanium particles, serving as a salt trapper and a catalyst precursor, and sodium recovery by sub-critical water. When Na(2)CO(3) was tested as a model salt, sodium removal efficiency was higher than theoretically maximum efficiency defined by Na(2)CO(3) solubility. The enhanced sodium removal resulted from in-situ synthesis of sodium titanate, which could catalyse acetic acid oxidation. The kinetics of sodium removal was described well by a diffusion mass-transfer model combined with a power law-type rate model of sodium titanate synthesis. Titanium particles showed positive effect on sodium removal in the case of NaOH, Na(2)SO(4) and Na(3)PO(4). However, they had negligible effect for NaCl and negative effect for Na(2)CrO(4), respectively. More than 99% of trapped sodium was recovered by sub-critical water except for Na(2)CrO(4). In contrast, sodium recovery efficiency remained less than 50% in the case of Na(2)CrO(4). Reused titanium particles showed the same performance for enhanced sodium removal. Enhanced salt removal supported by in-situ catalyst synthesis has great potential to enable both salt removal control and catalytic oxidation.
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Affiliation(s)
- F Takahashi
- Faculty of Urban and Environmental Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
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Ban N, Takahashi F, Sato K, Endo A, Ono K, Hasegawa T, Yoshitake T, Katsunuma Y, Kai M. Development of a web-based CT dose calculator: WAZA-ARI. Radiat Prot Dosimetry 2011; 147:333-337. [PMID: 21849327 DOI: 10.1093/rpd/ncr333] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A web-based computed tomography (CT) dose calculation system (WAZA-ARI) is being developed based on the modern techniques for the radiation transport simulation and for software implementation. Dose coefficients were calculated in a voxel-type Japanese adult male phantom (JM phantom), using the Particle and Heavy Ion Transport code System. In the Monte Carlo simulation, the phantom was irradiated with a 5-mm-thick, fan-shaped photon beam rotating in a plane normal to the body axis. The dose coefficients were integrated into the system, which runs as Java servlets within Apache Tomcat. Output of WAZA-ARI for GE LightSpeed 16 was compared with the dose values calculated similarly using MIRD and ICRP Adult Male phantoms. There are some differences due to the phantom configuration, demonstrating the significance of the dose calculation with appropriate phantoms. While the dose coefficients are currently available only for limited CT scanner models and scanning options, WAZA-ARI will be a useful tool in clinical practice when development is finalised.
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Affiliation(s)
- N Ban
- Tokyo Healthcare University, 2-5-23 Higashigaoka, Meguro-ku, Tokyo 152-8558, Japan.
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Nomura H, Aoki D, Takahashi F, Katsumata N, Watanabe Y, Konishi I, Jobo T, Hatae M, Hiura M, Yaegashi N. Randomized phase II study comparing docetaxel plus cisplatin, docetaxel plus carboplatin, and paclitaxel plus carboplatin in patients with advanced or recurrent endometrial carcinoma: a Japanese Gynecologic Oncology Group study (JGOG2041). Ann Oncol 2011; 22:636-642. [DOI: 10.1093/annonc/mdq401] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Takahashi F, Chiba N, Tajima K, Hayashida T, Shimada T, Takahashi M, Moriyama H, Brachtel E, Edelman EJ, Ramaswamy S, Maheswaran S. Breast tumor progression induced by loss of BTG2 expression is inhibited by targeted therapy with the ErbB/HER inhibitor lapatinib. Oncogene 2011; 30:3084-95. [PMID: 21339742 DOI: 10.1038/onc.2011.24] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The B-cell translocation gene-2 (BTG2), a p53-inducible gene, is suppressed in mammary epithelial cells during gestation and lactation. In human breast cancer, decreased BTG2 expression correlates with high tumor grade and size, p53 status, blood and lymph vessel invasion, local and metastatic recurrence and decrease in overall survival, suggesting that suppression of BTG2 has a critical role in disease progression. To analyze the role of BTG2 in breast cancer progression, BTG2 expression was knocked down in mammary epithelial cells. Suppression of BTG2 enhances the motility of cells in vitro and tumor growth and metastasis in vivo. The effects of BTG2 knockdown are mediated through stabilization of the human epidermal growth factor receptor (HER) ligands neuregulin and epiregulin and activation of the HER2 and HER3 receptors, leading to elevated AKT phosphorylation. Suppression of HER activation using the tyrosine kinase inhibitor lapatinib abrogates the effects of BTG2 knockdown, including the increased cell migration observed in vitro and the enhancement of tumorigenesis and metastasis in vivo. These results link BTG2-dependent effects on tumor progression to ErbB receptor signaling, and raise the possibility that targeted inhibition of this pathway may be relevant in the treatment of breast cancers that have reduced BTG2 expression.
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Affiliation(s)
- F Takahashi
- Department of Surgery, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA
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Tsuda S, Sato T, Takahashi F, Satoh D, Endo A, Sasaki S, Namito Y, Iwase H, Ban S, Takada M. Analysis of the effect of structural materials in a wall-less tissue-equivalent proportional counter irradiated by 290 MeV u(-1) carbon beam. Radiat Prot Dosimetry 2011; 143:450-454. [PMID: 21183535 DOI: 10.1093/rpd/ncq536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Effects of structural materials in a wall-less tissue-equivalent proportional counter were evaluated based on the calculation of energy deposits by EGS5 and the measurement of lineal energy distributions using 290 MeV u(-1) carbon beams. It is found that the correction of measured data based on simulation is necessary for understanding the energy deposition spectra in the homogeneous condition in tissues.
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Affiliation(s)
- S Tsuda
- Japan Atomic Energy Agency, Shirakata-shirane 2-4, Tokai, Ibaraki 319-1195, Japan.
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Hayashida T, Takahashi F, Chiba N, Brachtel E, Jinno H, Kitagawa Y, Sgroi D, Maheswaran S. 226 HOXB9, a gene overexpressed in breast cancer, induces angiogenesis, invasion, and lung metastasis. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)70253-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Hayashida T, Hayashida T, Takahashi F, Chiba N, Brachtel E, Jinno H, Kitagawa Y, Maheswaran S. HOXB9 Promotes the Acquisition of Tumorigenic Phenotypes in Mammary Epithelial Cells. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-6145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background:The class I HOX gene family consists of 39 members with a shared highly conserved 61-amino acid homeodomain motif. HOX genes are important regulators of developmental processes, and their role in neoplastic transformation and tumor progression is increasingly recognized (Abate-Shen et al., Nat Rev Cancer, 2002; Cantile et al., Eur J Cancer, 2003). However, the molecular mechanisms by which HOX proteins promote tumorigenesis is not well understood. We recently, observed that HOXB9, a 9th HOX gene paralogue involved in mouse mammay gland development, is deregulated in breast cancer and enhanced expression correlated with high tumor grade. A role for elevated HoxB9 expression in breast tumor progression is demontrated by its ability to activate the ErbB and TGF-B pathways which influence tumor-associated phenotypes in cells.Methods and results:Overexpression of HOXB9 was found in 43% of primary breast cancer by RT-PCR and in situ hybridization (Figure 1A) and correlated with high tumor grade. Ectopic expression of HOXB9 in MCF10A mammary epithelial cells induced EMT, cell migration, invasion (Figure 1B, and 1C). It also increased the expression of angiogenic factors, which enhance the formation of new vessels in mouse dorsal air sac model. Conversely, genetic ablation of endogenous HOXB9 in MDA-MB-231 breast cancer cells suppresses their motility and angiogenic potential. Further, we confirmed that HOXB9-induced tumor phenotypes arise through the activation of both ErbB-AKT and TGFß signaling pathways. Finally, in mouse xenograft model, we observed that HOXB9 cooperates with activated H-Ras to transform mammary epithelial cells leading to large, vascularized and invasive tumors (Figure 2).Discussion:Our findings imply that overexpression of HOXB9 in human breast cancer contributes to tumor progression through activation of signaling pathways that alter both tumor-specific cell fates and tumor-stromal microenvironment, leading to increased invasion and metastasis. It is suggested that combined suppression of ErbB and TGFß signaling pathways to target breast cancers overexpressing HOXB9 may be effective in tumor inhibition.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 6145.
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Affiliation(s)
| | - T. Hayashida
- 2 Keio University, School of Medicine, Tokyo, Japan
| | | | - N. Chiba
- 1 Massachusetts General Hospital, MA,
| | | | - H. Jinno
- 2 Keio University, School of Medicine, Tokyo, Japan
| | - Y. Kitagawa
- 2 Keio University, School of Medicine, Tokyo, Japan
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Takahashi F, Shigemori Y, Seki A. Accurate dose assessment system for an exposed person utilising radiation transport calculation codes in emergency response to a radiological accident. Radiat Prot Dosimetry 2009; 133:35-43. [PMID: 19181661 DOI: 10.1093/rpd/ncp002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A system has been developed to assess radiation dose distribution inside the body of exposed persons in a radiological accident by utilising radiation transport calculation codes-MCNP and MCNPX. The system consists mainly of two parts, pre-processor and post-processor of the radiation transport calculation. Programs for the pre-processor are used to set up a 'problem-dependent' input file, which defines the accident condition and dosimetric quantities to be estimated. The program developed for the post-processor part can effectively indicate dose information based upon the output file of the code. All of the programs in the dosimetry system can be executed with a generally used personal computer and accurately give the dose profile to an exposed person in a radiological accident without complicated procedures. An experiment using a physical phantom was carried out to verify the availability of the dosimetry system with the developed programs in a gamma ray irradiation field.
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Affiliation(s)
- F Takahashi
- Japan Atomic Energy Agency (JAEA), Shirakata 2-4, Tokai-mura, Ibaraki 319-1195, Japan.
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Isonishi S, Yasuda M, Takahashi F, Katsumata N, Kimura E, Aoki D, Jobo T, Terauchi F, Tsuda H, Sugiyama T. Randomized phase III trial of conventional paclitaxel and carboplatin (c-TC) versus dose dense weekly paclitaxel and carboplatin (dd-TC) in women with advanced epithelial ovarian, fallopian tube, or primary peritoneal cancer: Japanese Gynecologic Oncology. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.5506] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Nomura H, Aoki D, Takahashi F, Katsumata N, Watanabe Y, Konishi I, Jobo T, Hatae M, Hiura M, Yaegashi N. Randomized phase II study comparing docetaxel plus cisplatin, docetaxel plus carboplatin, and paclitaxel plus carboplatin in patients with advanced or recurrent endometrial carcinoma: Japanese Gynecologic Oncology Group trial (JGOG2041). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.16526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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48
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Takahashi F, Endo A. Numerical system utilising a Monte Carlo calculation method for accurate dose assessment in radiation accidents. Radiat Prot Dosimetry 2007; 126:595-9. [PMID: 17510203 DOI: 10.1093/rpd/ncm121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A system utilising radiation transport codes has been developed to derive accurate dose distributions in a human body for radiological accidents. A suitable model is quite essential for a numerical analysis. Therefore, two tools were developed to setup a 'problem-dependent' input file, defining a radiation source and an exposed person to simulate the radiation transport in an accident with the Monte Carlo calculation codes-MCNP and MCNPX. Necessary resources are defined by a dialogue method with a generally used personal computer for both the tools. The tools prepare human body and source models described in the input file format of the employed Monte Carlo codes. The tools were validated for dose assessment in comparison with a past criticality accident and a hypothesized exposure.
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Affiliation(s)
- F Takahashi
- Research Group for Radiation Protection, Division of Environment and Radiation Sciences, Nuclear Science and Energy Directorate, Japan Atomic Energy Agency (JAEA), Shirakata 2-4, Tokai-mura, Ibaraki 319-1195, Japan.
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Nosho K, Shitani M, Takahashi F, Ikeda Y, Goto A, Yamamoto H, Arimura Y, Ishida T, Endo T, Sato M, Imai K. A case of primary gastric Burkitt-like lymphoma in the early stage diagnosed by endoscopic mucosal resection. Int J Colorectal Dis 2006; 21:188-9. [PMID: 15668784 DOI: 10.1007/s00384-004-0701-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/11/2004] [Indexed: 02/04/2023]
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Ui-Tei K, Ueda R, Zenno S, Takahashi F, Doi N, Naito Y, Yamamoto M, Hashimoto N, Takahashi K, Hamada T, Tokunaga T, Saigo K. RNA Interference Induced by Transient or Stable Expression of Hairpin Structures of Double-Stranded RNA in Drosophila and Mammalian Cells. Mol Biol 2004. [DOI: 10.1023/b:mbil.0000023739.63178.70] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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