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Fujioka H, Yasui M, Hamada S, Fukumi K, Takeda N, Kobayashi Y, Furuta T, Ueda M. Palladium-catalyzed C-C bond cleavage of N-cyclopropyl acylhydrazones. Org Biomol Chem 2024; 22:3262-3267. [PMID: 38568183 DOI: 10.1039/d4ob00349g] [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: 04/25/2024]
Abstract
Despite their utility as directing groups, the C-C bond cleavage of cyclopropanes utilizing hydrazones has not been explored. Herein, Pd-catalyzed C-C bond cleavage reaction of N-cyclopropyl acylhydrazones, followed by cycloisomerization to yield pyrazoles, has been developed. The protocol enables the synthesis of various α-pyrazole carbonyl compounds, which have a potential of biological activity. Control experiments and DFT calculations suggest that β-carbon elimination of a stable 6-membered chelate palladium complex occurs, generating a conjugated azine as a reaction intermediate for the following cycloisomerization.
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Affiliation(s)
- Hiroki Fujioka
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
| | - Motohiro Yasui
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.
| | - Kohei Fukumi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
| | - Norihiko Takeda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.
| | - Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan.
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Akai H, Yasaka K, Sugawara H, Furuta T, Tajima T, Kato S, Yamaguchi H, Ohtomo K, Abe O, Kiryu S. Faster acquisition of magnetic resonance imaging sequences of the knee via deep learning reconstruction: a volunteer study. Clin Radiol 2024:S0009-9260(24)00141-7. [PMID: 38614869 DOI: 10.1016/j.crad.2024.03.002] [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] [Received: 07/11/2023] [Revised: 12/29/2023] [Accepted: 03/02/2024] [Indexed: 04/15/2024]
Abstract
AIM To evaluate whether deep learning reconstruction (DLR) can accelerate the acquisition of magnetic resonance imaging (MRI) sequences of the knee for clinical use. MATERIALS AND METHODS Using a 1.5-T MRI scanner, sagittal fat-suppressed T2-weighted imaging (fs-T2WI), coronal proton density-weighted imaging (PDWI), and coronal T1-weighted imaging (T1WI) were performed. DLR was applied to images with a number of signal averages (NSA) of 1 to obtain 1DLR images. Then 1NSA, 1DLR, and 4NSA images were compared subjectively, and by noise (standard deviation of intra-articular water or medial meniscus) and contrast-to-noise ratio between two anatomical structures or between an anatomical structure and intra-articular water. RESULTS Twenty-seven healthy volunteers (age: 40.6 ± 11.9 years) were enrolled. Three 1DLR image sequences were obtained within 200 s (approximately 12 minutes for 4NSA image). According to objective evaluations, PDWI 1DLR images showed the smallest noise and significantly higher contrast than 1NSA and 4NSA images. For fs-T2WI, smaller noise and higher contrast were observed in the order of 4NSA, 1DLR, and 1NSA images. According to the subjective analysis, structure visibility, image noise, and overall image quality were significantly better for PDWI 1DLR than 1NSA images; moreover, the visibility of the meniscus and bone, image noise, and overall image quality were significantly better for 1DLR than 4NSA images. Fs-T2WI and T1WI 1DLR images showed no difference between 1DLR and 4NSA images. CONCLUSION Compared to PDWI 4NSA images, PDWI 1DLR images were of higher quality, while the quality of fs-T2WI and T1WI 1DLR images was similar to that of 4NSA images.
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Affiliation(s)
- H Akai
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan; Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan
| | - K Yasaka
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan; Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - H Sugawara
- Department of Diagnostic Radiology, McGill University, 1650 Cedar Avenue, Montreal, Quebec, H3G 1A4, Canada
| | - T Furuta
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - T Tajima
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan; Department of Radiology, International University of Health and Welfare Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo, 108-8329, Japan
| | - S Kato
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - H Yamaguchi
- Department of Radiology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - K Ohtomo
- International University of Health and Welfare, 2600-1 Kiakanemaru, Ohtawara, Tochigi, 324-8501, Japan
| | - O Abe
- Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan
| | - S Kiryu
- Department of Radiology, International University of Health and Welfare Narita Hospital, 852 Hatakeda, Narita, Chiba, 286-0124, Japan.
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Inoue T, Ota M, Amijima Y, Takahashi H, Hamada S, Nakamura S, Kobayashi Y, Sasamori T, Furuta T. Dual Chalcogen-Bonding Interactions for the Conformational Control of Urea. Chemistry 2023; 29:e202302139. [PMID: 37507838 DOI: 10.1002/chem.202302139] [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: 07/05/2023] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 07/30/2023]
Abstract
Dual chalcogen-bonding interactions is proposed as a novel means for the conformational control of urea derivatives. The formation of a chalcogen-bonding interaction at both sides of the urea carbonyl group was unambiguously confirmed by X-ray diffraction as well as computational studies including non-covalent interaction (NCI) plot index analysis, quantum theory of atoms in molecules (QTAIM) analysis, and natural bond orbital (NBO) analysis via DFT calculations. By virtue of this dual interaction, urea derivatives that bear chalcogen atoms (X=S and Se) adopt a planar structure via the carbonyl oxygen (O) with an X⋅⋅⋅O⋅⋅⋅X arrangement on the same side of the molecule. The rigidity of the conformational lock was evaluated using the molecular arrangement in the crystal and the rotational barrier of benzochalcogenophene ring, which indicated a stronger conformational lock in benzoselenophene than in benzothiophene urea derivatives. Furthermore, the acidity of the urea derivatives increases according to the Lewis-acidic properties of the chalcogen-bonding interactions, whereby benzoselenophene urea is more acidic than benzothiophene urea. Tweezer-shaped urea derivatives were prepared, and their stereostructure proved the viability of the conformational control for defining the location of the substituents on the urea framework.
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Affiliation(s)
- Takumi Inoue
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Moe Ota
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Yui Amijima
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Haru Takahashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Seikou Nakamura
- Department of Pharmacognosy, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Takahiro Sasamori
- Department of Chemistry Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
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Hamada S, Sumida M, Yamazaki R, Kobayashi Y, Furuta T. Oxidative Deprotection of Benzyl Protecting Groups for Alcohols by an Electronically Tuned Nitroxyl-Radical Catalyst. J Org Chem 2023; 88:12464-12473. [PMID: 37586039 DOI: 10.1021/acs.joc.3c01217] [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: 08/18/2023]
Abstract
The oxidative deprotection of benzyl (Bn) groups using nitroxyl-radical catalyst 1 and co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA) is reported. This catalyst is highly active for the oxidation of benzylic ethers because of the electronic tuning on account of the electron-withdrawing ester groups next to the catalytically active center. This catalytic system promotes deprotections at ambient temperature and has a broad substrate scope, including substrates possessing hydrogenation-sensitive functional groups, while the deprotection hardly proceeds when using well-known nitroxyl-radical catalysts such as 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO). The 1/PIFA system also promotes the deprotection of several benzylic protecting groups, including 2-naphthylmethyl (NAP) and 4-methylbenzyl (MBn) groups. Catalyst 1 was also effective for the direct synthesis of ketones and aldehydes from Bn ethers via deprotected alcohols using an excess of the co-oxidant PIFA.
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Affiliation(s)
- Shohei Hamada
- Laboratory of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Maiko Sumida
- Laboratory of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Rikako Yamazaki
- Laboratory of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Yusuke Kobayashi
- Laboratory of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Takumi Furuta
- Laboratory of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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Furuta T, Sakuda T, Yoshioka K, Arihiro K, Adachi N. Metastatic patellar bone tumor due to gastric cancer resembling a primary or secondary aneurysmal bone cyst: A case report. Int J Surg Case Rep 2023; 108:108379. [PMID: 37302174 PMCID: PMC10382741 DOI: 10.1016/j.ijscr.2023.108379] [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: 05/09/2023] [Revised: 05/31/2023] [Accepted: 05/31/2023] [Indexed: 06/13/2023] Open
Abstract
INTRODUCTION AND IMPORTANCE Patellar bone tumors are very rare, and most are benign or of intermediate type. In this report, we describe our experience of a metastatic patellar bone tumor caused by gastric cancer, which resembled a very rare primary or secondary aneurysmal bone cyst and review the literature. CASE PRESENTATION A 65-year-old man presented with severe pain in the patellar region and marked limitation of the knee joint range of motion. He had a history of gastric cancer; however, epidemiological, clinical, and imaging findings led us to strongly suspect an aneurysm-like bone cyst. Thus, we performed bone tumor curettage and autologous artificial bone grafting without biopsy because of the severe pain. Pathology results showed gastric cancer metastasis; hence, patellectomy and patellar tendon augmentation with femoral fascia were performed. The Musculoskeletal Tumor Society (MSTS) score was taken postoperatively to assess pain and function. CLINICAL DISCUSSION We experienced a very rare gastric cancer-related metastatic patellar bone tumor, which resembled a primary or secondary aneurysmal bone cyst in frequency and imaging findings. Patellectomy was ultimately performed, and the patient's MSTS score improved markedly. CONCLUSION Despite its very low frequency, patellar metastatic bone tumors must be taken into account without being misled by the frequency or imaging findings and a biopsy should necessarily be performed.
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Affiliation(s)
- T Furuta
- Department of Orthopaedic Surgery, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
| | - T Sakuda
- Department of Orthopaedic Surgery, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
| | - K Yoshioka
- Department of Orthopaedic Surgery, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
| | - K Arihiro
- Department of Pathology, Hiroshima University Hospital, Hiroshima, Japan.
| | - N Adachi
- Department of Orthopaedic Surgery, Hiroshima University, Graduate School of Biomedical and Health Sciences, Hiroshima, Japan.
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Foad M, Elboray E, Dardeer H, Kobayashi Y, Furuta T, Hamada S, Dohi T, Aly M. 1,3-Dipolar Cycloaddition of 3-Chromonyl-Substituted Glycine Imino Esters with Arylidenes and in situ Diastereodivergent via Retrocycloaddition. Chem Asian J 2023; 18:e202300215. [PMID: 37010444 DOI: 10.1002/asia.202300215] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/01/2023] [Accepted: 04/03/2023] [Indexed: 04/04/2023]
Abstract
1,3-Dipolar cycloaddition through in situ generation of azomethine ylide provides a straightforward and critically important sustainable approach for access to diverse pyrrolidine chemical space. Herein, we developed a metal-free AcOH-activated 1,3-dipolar cycloaddition protocol that permits the synthesis of uncommon pyrrolidine cycloadducts with excellent diastereoselectivity. The challenging substrates of 3-formylchromone, glycine ester.HCl and arylidene dipolarophile were reacted in the presence of AcONa, which played a dual role as a base and AcOH source, to deliver firstly endo-cycloadduct. Under prolonged reaction time at room temperature or heating; the endo-adduct underwent diastereodivergent via a sequence of retro-cycloaddition, stereomutation of the generated syn-dipole into anti-dipole and recycloaddition; to furnish the scarcely known exo'-cycloadduct with high diastereodivergency. The reaction worked well with a broad range of substrates and the stereochemistry of the obtained cycloadducts was determined without ambiguity using NMR- and X-ray analysis. Experimental and theoretical DFT calculation studies were performed to support the proposed reaction mechanism and elucidate the key role of AcOH in the process which seems more beneficial than other transition metal-catalyzed processes.
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Affiliation(s)
- Mohammed Foad
- South Valley University Faculty of Science, Chemistry, EGYPT
| | - Elghareeb Elboray
- Ritsumeikan Daigaku - Biwako Kusatsu Campus, College of Pharmaceutical sciences, 1-1-1 Nojihigashi, Kusatsu City, 525-8577, Shiga, JAPAN
| | - Hemat Dardeer
- South Valley University Faculty of Science, Chemistry, EGYPT
| | - Yusuke Kobayashi
- Kyoto Pharmaceutical University: Kyoto Yakka Daigaku, Chemistry, JAPAN
| | - Takumi Furuta
- Kyoto Pharmaceutical University: Kyoto Yakka Daigaku, Chemistry, JAPAN
| | - Shohei Hamada
- Kyoto Pharmaceutical University: Kyoto Yakka Daigaku, Chemistry, JAPAN
| | - Toshifumi Dohi
- Ritsumeikan University College of Pharmaceutical Sciences: Ritsumeikan Daigaku Yakugakubu Daigakuin Yakugaku Kenkyuka, Chemistry, JAPAN
| | - Moustafa Aly
- South Valley University Faculty of Science, Chemistry, EGYPT
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Koeduka T, Watanabe B, Shirahama K, Nakayasu M, Suzuki S, Furuta T, Suzuki H, Matsui K, Kosaka T, Ozaki SI. Biosynthesis of dillapiole/apiole in dill (Anethum graveolens): characterization of regioselective phenylpropene O-methyltransferase. Plant J 2023; 113:562-575. [PMID: 36534115 DOI: 10.1111/tpj.16068] [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] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
The phenylpropene volatiles dillapiole and apiole impart one of the characteristic aromas of dill (Anethum graveolens) weeds. However, very few studies have been conducted to investigate the chemical composition of volatile compounds from different developmental stages and plant parts of A. graveolens. In this study, we examined the distribution of volatile phenylpropenes, including dillapiole, in dill plants at various developmental stages. We observed that young dill seedlings accumulate high levels of dillapiole and apiole, whereas a negligible proportion was found in the flowering plants and dry seeds. Based on transcriptomics and co-expression approaches with phenylpropene biosynthesis genes, we identified dill cDNA encoding S-adenosyl-L-methionine-dependent O-methyltransferase 1 (AgOMT1), an enzyme that can convert 6- and 2-hydroxymyristicin to dillapiole and apiole, respectively, via the methylation of the ortho-hydroxy group. The AgOMT1 protein shows an apparent Km value of 3.5 μm for 6-hydroxymyristicin and is 75% identical to the anise (Pimpinella anisum) O-methyltransferase (PaAIMT1) that can convert isoeugenol to methylisoeugenol via methylation of the hydroxy group at the para-position of the benzene ring. AgOMT1 showed a preference for 6-hydroxymyristicin, whereas PaAIMT1 displayed a large preference for isoeugenol. In vitro mutagenesis experiments demonstrated that substituting only a few residues can substantially affect the substrate specificity of these enzymes. Other plants belonging to the Apiaceae family contained homologous O-methyltransferase (OMT) proteins highly similar to AgOMT1, converting 6-hydroxymyristicin to dillapiole. Our results indicate that apiaceous phenylpropene OMTs with ortho-methylating activity evolved independently of phenylpropene OMTs of other plants and the enzymatic function of AgOMT1 and PaAIMT1 diverged recently.
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Affiliation(s)
- Takao Koeduka
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Bunta Watanabe
- Chemistry Laboratory, The Jikei University School of Medicine, 8-3-1 Kokuryo, Chofu, Tokyo, 182-8570, Japan
| | - Konomi Shirahama
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Masaru Nakayasu
- Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Shiro Suzuki
- Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu City, Gifu, 501-1193, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto, 607-8414, Japan
| | - Hideyuki Suzuki
- Department of Research and Development, Hirata Corporation, 111 Hitotsugi, Ueki, Kita, Kumamoto-shi, Kumamoto, 861-0198, Japan
| | - Kenji Matsui
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Tomoyuki Kosaka
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
- Research Center for Thermotolerant Microbial Resources (RCTMR), Yamaguchi University, Yamaguchi, 753-8515, Japan
| | - Shin-Ichi Ozaki
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8515, Japan
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Murai T, Hamada S, Kobayashi Y, Sasamori T, Furuta T. Syntheses, and Structural and Physical Properties of Axially Chiral Biaryl Dicarboxylic Acids Bearing Chalcogen Atoms. Chem Pharm Bull (Tokyo) 2022; 70:605-615. [DOI: 10.1248/cpb.c22-00217] [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: 11/22/2022]
Affiliation(s)
- Takuya Murai
- Department of Pharamaceutical Chemistry, Kyoto Pharmaceutical University
| | - Shohei Hamada
- Department of Pharamaceutical Chemistry, Kyoto Pharmaceutical University
| | - Yusuke Kobayashi
- Department of Pharamaceutical Chemistry, Kyoto Pharmaceutical University
| | - Takahiro Sasamori
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba
| | - Takumi Furuta
- Department of Pharamaceutical Chemistry, Kyoto Pharmaceutical University
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Kimura T, Hamada S, Furuta T, Takemoto Y, Kobayashi Y. N-Acylimino-λ 3-iodanes from the Metathesis of Iodosoarenes and Nitriles for the Photoinduced C-H Perfluoroacylamination of (Hetero)Arenes. Org Lett 2022; 24:4835-4839. [PMID: 35758853 DOI: 10.1021/acs.orglett.2c02054] [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: 11/29/2022]
Abstract
An efficient and scalable synthesis of N-perfluoroacylimino-λ3-iodanes was achieved via an unprecedented metathesis between iodosoarenes and perfluoroalkanenitriles. The perfluoroacylamino groups of the iodanes could be introduced to aromatic and heteroaromatic rings using photoirradiation.
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Affiliation(s)
- Tomohiro Kimura
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo, Kyoto 607-8304, Japan
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, 1 Misasagishichono-cho, Yamashina, Kyoto 607-8412, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, 1 Misasagishichono-cho, Yamashina, Kyoto 607-8412, Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo, Kyoto 607-8304, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, 1 Misasagishichono-cho, Yamashina, Kyoto 607-8412, Japan
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Furuta T, Sakuda T, Oae K, Harada Y, Arihiro K, Adachi N. New special approach for shoulder stability after Malawer type IVB shoulder girdle resection: A case report. Int J Surg Case Rep 2022; 95:107189. [PMID: 35598340 PMCID: PMC9127565 DOI: 10.1016/j.ijscr.2022.107189] [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: 04/08/2022] [Revised: 04/23/2022] [Accepted: 05/08/2022] [Indexed: 11/16/2022] Open
Abstract
Introduction and importance Scapular prostheses are useful in shoulder stability after shoulder girdle resection for malignant bone tumors; however, they are difficult to obtain in Japan. Therefore, other methods must be considered, depending on the extent of resection. We report a case in which a clavicle-locking plate, Nesplon tape, and a proximal humeral prosthesis were used to ensure shoulder stability and preserve stable upper limb function. Case presentation A 56-year-old man presented with a large mass and edema over the entire right scapula, which caused severe pain, limited the shoulder's range of motion, and impaired function of the entire upper extremity. Clinical imaging and pathological findings indicated a diagnosis of conventional chondrosarcoma. Using the Malawer technique type IVB, we resected the shoulder girdle and secured shoulder stability with a clavicle-locking plate, Nesplon tape, and a proximal humeral prosthesis. To evaluate the patient, we obtained his Musculoskeletal Tumor Society (MSTS) and Disabilities of Arm, Shoulder, and Hand (DASH) scores 3 months postoperatively. Clinical discussion To preserve the function of the patient's elbow and hand, the stability of his shoulder was important. We could achieve this stability by using a prosthesis available in Japan. The patient's MSTT and DASH scores improved remarkably. Conclusion A clavicle-locking plate, Nesplon tape, and a proximal humeral prosthesis can be used to ensure shoulder stability after scapular girdle resection and can preserve or improve upper limb function.
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Murai T, Xing Y, Kurokawa M, Kuribayashi T, Nikaido M, Elboray EE, Hamada S, Kobayashi Y, Sasamori T, Kawabata T, Furuta T. One-Pot Preparation of ( NH)-Phenanthridinones and Amide-Functionalized [7]Helicene-like Molecules from Biaryl Dicarboxylic Acids. J Org Chem 2022; 87:5510-5521. [PMID: 35394787 DOI: 10.1021/acs.joc.1c02769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A one-pot transformation of biaryl dicarboxylic acids to (NH)-phenanthridinone derivatives based on a Curtius rearrangement and subsequent basic hydrolysis was developed. This method is also applicable for the preparation of optically active amide-functionalized [7]helicene-like molecules. Furthermore, aza[5]helicene derivatives with a phosphate moiety were isolated as a product of the Curtius rearrangement step in the case of substrates that bear chalcogen atoms. The stereostructures of these products, revealed by X-ray diffraction analysis, suggested that chalcogen-bonding and pnictogen-bonding interactions might contribute to their stabilization. The configurational stability of the helicene-like molecules and their chiroptical properties were further investigated.
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Affiliation(s)
- Takuya Murai
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Yongning Xing
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Mayu Kurokawa
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | | | - Masanori Nikaido
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Elghareeb E Elboray
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.,Chemistry Department, Faculty of Science, South Valley University, Qena 83523, Egypt
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Takahiro Sasamori
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tenodai 1-1-1, Tsukuba, Ibaraki 307-8571, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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Furuta T, Inoue T, Hamada S, Nakamura R, Sasamori T. Synthesis of Amide-Functionalized Thia[7]helicene-Like Molecule and Its Supramolecular Assembly in the Solid State. HETEROCYCLES 2022. [DOI: 10.3987/com-21-14603] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Hamada S, Yano K, Kobayashi Y, Kawabata T, Furuta T. Oxidaition of cyclic benzylic ethers by an electronically tuned nitroxyl radical. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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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14
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Kobayashi Y, Masakado S, Murai T, Hamada S, Furuta T, Takemoto Y. A bench-stable N-trifluoroacetyl nitrene equivalent for a simple synthesis of 2-trifluoromethyl oxazoles. Org Biomol Chem 2021; 19:6628-6632. [PMID: 34282812 DOI: 10.1039/d1ob00947h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
ortho-Nitro-substituted N-trifluoroacetyl imino-λ3-iodane is a bench-stable trifluoroacetyl nitrene precursor, in which intra- and intermolecular halogen bonding (XB) plays an important role. Potential synthetic applications of this novel precursor were explored.
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Affiliation(s)
- Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.
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15
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Furuta T, Xing Y, Nikaido M, Murai T, Hamada S, Kobayashi Y, Sasamori T, Kawabata T. Concise Synthesis of an Amide-Functionalized [7]Helicene-like Molecule via Intramolecular Amidation. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)40] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Taha AG, Elboray EE, Kobayashi Y, Furuta T, Abbas-Temirek HH, Aly MF. Nitro-Substituted Benzaldehydes in the Generation of Azomethine Ylides and Retro-1,3-Dipolar Cycloadditions. J Org Chem 2021; 86:547-558. [PMID: 33283511 DOI: 10.1021/acs.joc.0c02241] [Citation(s) in RCA: 1] [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] [Indexed: 11/29/2022]
Abstract
1,3-Dipolar cycloaddition of 2- and 3-nitrobenzaldehydes with 2-aminomethylpyridine and ethyl (2E)-2-cyano-3-(4-nitrophenyl)prop-2-enoate yielded endo-cycloadducts as the sole products under various reaction conditions. Fortuitously, 4-nitrobenzaldehyde behaved differently in three- and four-component cascades to produce a mixture of endo- and exo'-cycloadducts. This reaction is solvent- and temperature-dependent, and consequently, both the endo- and exo'-cycloadducts were synthesized in an excellent regio-, stereo-, and chemoselective fashion. Retro-1,3-dipolar cycloadditions of the endo-cycloadducts were conducted under mild reaction conditions, and the generated syn-dipoles were stereomutated into anti-dipoles which recycloadded with the dipolarophiles to provide the exo'-cycloadducts. Mechanistic studies were carried out to support the proposed mechanisms. Unprecedentedly, particular arylidene scaffolds participated as aldehyde or activated methylene precursors. Density functional theory calculations were performed to shed light on the importance of AcOH in the generation and isomerization of dipoles and to explain the high selectivity and the possibility of retro-cycloaddition.
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Affiliation(s)
- Ahmed G Taha
- Department of Chemistry, Faculty of Science, South Valley University, Qena 83523, Egypt
| | - Elghareeb E Elboray
- Department of Chemistry, Faculty of Science, South Valley University, Qena 83523, Egypt.,Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | | | - Moustafa F Aly
- Department of Chemistry, Faculty of Science, South Valley University, Qena 83523, Egypt
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17
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Murai T, Lu W, Kuribayashi T, Morisaki K, Ueda Y, Hamada S, Kobayashi Y, Sasamori T, Tokitoh N, Kawabata T, Furuta T. Conformational Control in Dirhodium(II) Paddlewheel Catalysts Supported by Chalcogen-Bonding Interactions for Stereoselective Intramolecular C–H Insertion Reactions. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03689] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takuya Murai
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Wenjie Lu
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | | | - Kazuhiro Morisaki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Yusuke Kobayashi
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Takahiro Sasamori
- Graduate School of Natural Sciences, Nagoya City University, Mizuho-ku, Nagoya, Aichi 467-8501, Japan
| | - Norihiro Tokitoh
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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18
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Nakagaw I, Park H, Kotsugi M, Furuta T, Omoto K, Nishimura F. Elective Carotid Stenting After Urgent Best Medical Treatment Suppresses Recurrent Stroke in Patients With Symptomatic Carotid Artery Severe Stenosis. J Vasc Surg 2020. [DOI: 10.1016/j.jvs.2020.06.004] [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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19
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Hamada S, Sugimoto K, Elboray EE, Kawabata T, Furuta T. Chemoselective Oxidation of p-Methoxybenzyl Ethers by an Electronically Tuned Nitroxyl Radical Catalyst. Org Lett 2020; 22:5486-5490. [PMID: 32633536 DOI: 10.1021/acs.orglett.0c01839] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxidation of p-methoxy benzyl (PMB) ethers was achieved using nitroxyl radical catalyst 1, which contains electron-withdrawing ester groups adjacent to the nitroxyl group. The oxidative deprotection of the PMB moieties on the hydroxy groups was observed upon treatment of 1 with 1 equiv of the co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA). The corresponding carbonyl compounds were obtained by treating the PMB-protected alcohols with 1 and an excess of PIFA.
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Affiliation(s)
- Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Koichi Sugimoto
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Elghareeb E Elboray
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.,Department of Chemistry, Faculty of Science, South Valley University, Qena, Egypt
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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20
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Takeuchi H, Fujimori Y, Ueda Y, Shibayama H, Nagaishi M, Yoshimura T, Sasamori T, Tokitoh N, Furuta T, Kawabata T. Solvent-Dependent Mechanism and Stereochemistry of Mitsunobu Glycosylation with Unprotected Pyranoses. Org Lett 2020; 22:4754-4759. [DOI: 10.1021/acs.orglett.0c01549] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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)
- Hironori Takeuchi
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yusuke Fujimori
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Hiromitsu Shibayama
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Masaru Nagaishi
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Tomoyuki Yoshimura
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takahiro Sasamori
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Norihiro Tokitoh
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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21
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Nishino R, Hamada S, Elboray EE, Ueda Y, Kawabata T, Furuta T. Axial chirality in biaryl N,N-dialkylaminopyridine derivatives bearing an internal carboxy group. Chirality 2020; 32:588-593. [PMID: 32134158 DOI: 10.1002/chir.23207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 01/15/2020] [Revised: 01/25/2020] [Accepted: 01/27/2020] [Indexed: 01/21/2023]
Abstract
Axial chirality in N,N-dimethylaminopyridines as well as N,N-dipropylaminopyridines bearing an internal carboxy group were evaluated based on their racemization barriers and circular dichroism spectra. The half-life of racemization of N,N-dipropylaminopyridine derivative 2 was estimated to be 19.7 days at 20°C. Its enantiomers isolated as optically active forms showed positive-negative and negative-positive Cotton effects for (+)-2 and (-)-2, respectively, from 310 to 210 nm. Furthermore, (-)-2 was applied as a chiral nucleophilic catalyst and exhibited asymmetric induction in acylative kinetic resolution of 1-(1-naphthyl)ethane-1-ol.
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Affiliation(s)
- Reiko Nishino
- Institute for Chemical Research, Kyoto University, Uji, Japan
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Elghareeb E Elboray
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Kyoto, Japan.,Chemistry Department, Faculty of Science, South Valley University, Qena, Egypt
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University, Uji, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Kyoto, Japan
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22
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Furuta T, Hamada S, Wang S, Murai T, Kawabata T, Xing Y, Inoue T, Ueda Y. Synthesis of Axially Chiral Binaphthothiophene δ-Amino Acid Derivatives Bearing Chalcogen Bonds. HETEROCYCLES 2020. [DOI: 10.3987/com-19-s(f)15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Hamada S, Sugimoto K, Iida M, Furuta T. Simple and rapid p-methoxybenzylation of hydroxy and amide groups at room temperature by NaOt-Bu and DMSO. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151277] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Matsuguma C, Wakiguchi H, Suzuki Y, Okada S, Furuta T, Ohnishi Y, Azuma Y, Ohga S, Hasegawa S. Dynamics of immunocyte activation during intravenous immunoglobulin treatment in Kawasaki disease. Scand J Rheumatol 2019; 48:491-496. [DOI: 10.1080/03009742.2019.1604992] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- C Matsuguma
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - H Wakiguchi
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Y Suzuki
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - S Okada
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - T Furuta
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Y Ohnishi
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - Y Azuma
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
| | - S Ohga
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
- Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - S Hasegawa
- Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Japan
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25
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Yanagi M, Ueda Y, Ninomiya R, Imayoshi A, Furuta T, Mishiro K, Kawabata T. Synthesis of 4-Deoxy Pyranosides via Catalyst-Controlled Site-Selective Toluoylation of Abundant Sugars. Org Lett 2019; 21:5006-5009. [DOI: 10.1021/acs.orglett.9b01549] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Masanori Yanagi
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Ryo Ninomiya
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Ayumi Imayoshi
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Kenji Mishiro
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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26
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Abstract
AbstractTheories explaining the dependence of characteristic X-ray intensity on particle size in heterogeneous materials are reviewed. Several discrepancies between the theories and between theory and experiment have been discovered. A new theory is proposed based on a more rigorous physical model. It is shown to explain well-established phenomena at least as precisely as do previous formulae. Excellent agreement is also obtained with new observations of the variation of characteristic X-ray intensity with packing degree and, in samples consisting of only one type of particle, with both packing degree and particle size. The same basic theory also predicts the observed variation of X-ray Intensity backscattered from or transmitted through a sample. It is also shown that similar results are obtained with particles suspended In a homogeneous matrix, such as an aqueous slurry.
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27
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Irie Y, Hanaki M, Murakami K, Imamoto T, Furuta T, Kawabata T, Kawase T, Hirose K, Monobe Y, Akagi KI, Yanagita RC, Irie K. Synthesis and biochemical characterization of quasi-stable trimer models of full-length amyloid β40 with a toxic conformation. Chem Commun (Camb) 2019; 55:182-185. [DOI: 10.1039/c8cc08618d] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The only trimer model to exhibit weak but significant neurotoxicity against SH-SY5Y cells was the one which was linked at position 38.
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Affiliation(s)
- Yumi Irie
- Division of Food Science and Biotechnology
- Graduate School of Agriculture
- Kyoto University
- Kyoto 606-8502
- Japan
| | - Mizuho Hanaki
- Division of Food Science and Biotechnology
- Graduate School of Agriculture
- Kyoto University
- Kyoto 606-8502
- Japan
| | - Kazuma Murakami
- Division of Food Science and Biotechnology
- Graduate School of Agriculture
- Kyoto University
- Kyoto 606-8502
- Japan
| | | | - Takumi Furuta
- Institute for Chemical Research
- Kyoto University
- Kyoto 611-0011
- Japan
| | - Takeo Kawabata
- Institute for Chemical Research
- Kyoto University
- Kyoto 611-0011
- Japan
| | | | | | - Yoko Monobe
- National Institute of Biomedical Innovation
- Health and Nutrition
- Osaka 567-0085
- Japan
| | - Ken-ichi Akagi
- National Institute of Biomedical Innovation
- Health and Nutrition
- Osaka 567-0085
- Japan
| | - Ryo C. Yanagita
- Department of Applied Biological Science
- Faculty of Agriculture
- Kagawa University
- Kagawa 761-0795
- Japan
| | - Kazuhiro Irie
- Division of Food Science and Biotechnology
- Graduate School of Agriculture
- Kyoto University
- Kyoto 606-8502
- Japan
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28
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Murai T, Xing Y, Kuribayashi T, Lu W, Guo JD, Yella R, Hamada S, Sasamori T, Tokitoh N, Kawabata T, Furuta T. Synthesis and Structural Properties of Axially Chiral Binaphthothiophene Dicarboxylic Acid. Chem Pharm Bull (Tokyo) 2018; 66:1203-1206. [PMID: 30504635 DOI: 10.1248/cpb.c18-00668] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Axially chiral binaphthothiophene dicarboxylic acid was prepared as a novel functionalized chiral dicarboxylic acid. The crystal structures of both the racemic form and its salt with chiral diamine revealed the intramolecular S···O interactions (chalcogen bonds) between the sulfur in the naphthothiophene rings and the oxygen of the carboxy groups. The negative-positive and the positive-negative Cotton effects from longer to shorter wavelengths were observed for (R)- and (S)-enantiomers, respectively, in the circular dichroism (CD) spectra.
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Affiliation(s)
- Takuya Murai
- Institute for Chemical Research, Kyoto University
| | | | | | - Wenjie Lu
- Institute for Chemical Research, Kyoto University
| | | | - Ramesh Yella
- Institute for Chemical Research, Kyoto University
| | - Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University
| | | | | | | | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University
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29
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Furuta T, Baba S, Yamade M, Uotani T, Kagami T, Suzuki T, Tani S, Hamaya Y, Iwaizumi M, Osawa S, Sugimoto K. High incidence of autoimmune gastritis in patients misdiagnosed with two or more failures of H. pylori eradication. Aliment Pharmacol Ther 2018; 48:370-377. [PMID: 29920721 DOI: 10.1111/apt.14849] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 02/12/2018] [Accepted: 05/23/2018] [Indexed: 12/16/2022]
Abstract
BACKGROUND Although autoimmune gastritis (AIG) is generally considered relatively rare, we frequently encounter AIG among patients at to our hospital who have experienced at least two episodes of Helicobacter pylori eradication failure. AIMS We investigated the incidence of AIG in consecutive patients who consulted our department for H. pylori eradication with reference to eradication history. METHODS A total of 404 consecutive patients who visited the H. pylori-specific out-patient unit of our hospital from June 2015 to June 2017 were enrolled. Of these, 137 were treatment-naive, 47 had failed treatment once (single failure), and 220 had failed treatment twice or more (multiple failures) by 13 C-UBT. Gastroscopy was performed in all patients. Culture tests of gastric mucosal samples were performed for H. pylori and other bacteria positive for urease activity. Anti-parietal cell antibody (APCA) was measured. Patients with severe atrophy in the gastric corpus and positivity for APCA were diagnosed as having AIG. RESULTS A total of 43 patients were diagnosed as having AIG, of whom two were treatment-naive (1.5%, 2/137), 1 failed eradication once (2.1% 1/47), and 40 failed treatment at least twice (18.2%, 40/220). The incidence of AIG was significantly higher in the multiple failure group than in the single failure or treatment-naive groups. Urease-positive bacteria, such as Klebsiella pneumoniae and alpha-streptococcus, were identified in 33 of the 35 AIG patients who underwent culture testing. CONCLUSION AIG patients were often misdiagnosed as refractory to eradication therapy, probably because achlorhydria in AIG might allow urease-positive bacteria other than H. pylori to colonise the stomach, causing positive 13 C-UBT results.
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Affiliation(s)
- T Furuta
- Center for Clinical Research, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - S Baba
- Department of Diagnostic Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - M Yamade
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - T Uotani
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - T Kagami
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - T Suzuki
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - S Tani
- Department of Endoscopic and Photodynamic Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Y Hamaya
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - M Iwaizumi
- Department of Laboratory Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - S Osawa
- Department of Endoscopic and Photodynamic Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - K Sugimoto
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
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30
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Nakayama Y, Shinohara M, Tani T, Kawaguchi T, Furuta T, Izawa T, Kaise H, Miyazaki W, Nakano Y. The Plasmin Heavy Chain - Urokinase Conjugate: A Specific Thrombolytic Agent. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1661684] [Citation(s) in RCA: 6] [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: 10/28/2022]
Abstract
SummaryLow molecular weight urokinase (LMW-UK) was coupled to the heavy chain of plasmin to make it able to bind to fibrin. The purified conjugate (PHC-UK conjugate), which consisted of equimolar concentrations of each starting material had a molecular weight of 93,600, bound tightly to fibrin-monomer-Sepharose and was not washed off with 1 M NaCl, but was eluted specifically with s-amino caproic acid. The conjugate showed higher fibrinolytic activity than HMW-UK. A control conjugate prepared by coupling human serum albumin to LMW-UK (HSA-UK conjugate) showed the same fibrinolytic activity as HMW-UK. The half-lives of these two conjugates in rabbits were about 3 times that of HMW-UK. In an experimental pulmonary embolism model in rabbits, the PHC-UK conjugate showed about 10 times higher thrombolytic activity than HMW-UK, while the HSA-UK conjugate showed similar thrombolytic activity as HMW-UK, and moreover caused severe systemic fibrinogen breakdown. Thus the significant increase in thrombolytic activity after injection of PHC-UK conjugate into rabbits may be due to its newly acquired fibrin binding activity, and not to increase in its half-life. It is concluded that the PHC-UK conjugate may be useful in treatment of thrombosis.
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Affiliation(s)
- Y Nakayama
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - M Shinohara
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - T Tani
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - T Kawaguchi
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - T Furuta
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - T Izawa
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - H Kaise
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - W Miyazaki
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
| | - Y Nakano
- Tokushima Research Institute, Otsuka Pharmaceutical Co. Ltd., Tokushima, Japan
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Tominaga K, Sakata Y, Kusunoki H, Odaka T, Sakurai K, Kawamura O, Nagahara A, Takeuchi T, Fujikawa Y, Oshima T, Kato M, Furuta T, Murakami K, Chiba T, Miwa H, Kinoshita Y, Higuchi K, Kusano M, Iwakiri R, Fujimoto K, Tack JF, Arakawa T. Rikkunshito simultaneously improves dyspepsia correlated with anxiety in patients with functional dyspepsia: A randomized clinical trial (the DREAM study). Neurogastroenterol Motil 2018; 30:e13319. [PMID: 29498457 DOI: 10.1111/nmo.13319] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [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: 12/11/2017] [Accepted: 01/26/2018] [Indexed: 02/05/2023]
Abstract
BACKGROUND Functional dyspepsia (FD), a heterogeneous disorder, involves multiple pathogenetic mechanisms. Developing treatments for FD has been challenging. We performed a randomized, placebo-controlled, double-blind clinical trial to determine the efficacy of rikkunshito, a Japanese herbal medicine, in FD patients. METHODS FD patients (n = 192) who met the Rome III criteria without Helicobacter pylori infection, predominant heartburn, and depression were enrolled at 56 hospitals in Japan. After 2 weeks of single-blind placebo treatment, 128 patients with continuous symptoms were randomly assigned to 8 weeks of rikkunshito (n = 64) or placebo (n = 61). The primary efficacy endpoint was global assessment of overall treatment efficacy (OTE). The secondary efficacy endpoints were improvements in upper gastrointestinal symptoms evaluated by the Patient Assessment of Upper Gastrointestinal Disorders-Symptom Severity Index (PAGI-SYM), the Global Overall Symptom scale (GOS), and the modified Frequency Scale for the Symptoms of Gastroesophageal Reflux Disease (m-FSSG), and psychological symptoms evaluated by the Hospital Anxiety and Depression Scale (HADS). KEY RESULTS Rikkunshito increased OTE compared to placebo at 8 weeks (P = .019). Rikkunshito improved upper gastrointestinal symptoms (PAGI-SYM, GOS, and m-FSSG) at 8 weeks, especially postprandial fullness/early satiety (P = .015 and P = .001) and bloating (P = .007 and P = .002) of the PAGI-SYM subscales at 4 weeks and 8 weeks. Improvement of HADS at 8 weeks (P = .027) correlated with those of PAGI-SYM (r = .302, P = .001), GOS (r = .186, P = .044), and m-FSSG (r = .462, P < .001), postprandial fullness/early satiety (r = .226, P = .014), dyspepsia (r = .215, P = .019), and PDS (r = .221, P = .016). CONCLUSION & INFERENCES Rikkunshito may be beneficial for FD patients to simultaneously treat gastrointestinal and psychological symptoms.
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Affiliation(s)
- K Tominaga
- Premier Developmental Research of Medicine, Osaka Medical College, Osaka, Japan
- Second Department of Internal Medicine, Osaka Medical College, Osaka, Japan
| | - Y Sakata
- Department of Internal Medicine, Saga Medical School, Saga, Japan
| | - H Kusunoki
- Department of General Medicine, Kawasaki Medical School, Kurashiki-city, Okayama, Japan
| | - T Odaka
- Odaka Medical and Gastrointestinal Clinic, Chiba, Japan
| | | | - O Kawamura
- Department of Endoscopy and Endoscopic Surgery, Gunma University Hospital, Maebashi, Gunma, Japan
| | - A Nagahara
- Department of Gastroenterology, Juntendo University Shizuoka Hospital, Shizuoka, Japan
| | - T Takeuchi
- Premier Developmental Research of Medicine, Osaka Medical College, Osaka, Japan
| | - Y Fujikawa
- Premier Developmental Research of Medicine, Osaka Medical College, Osaka, Japan
- Second Department of Internal Medicine, Osaka Medical College, Osaka, Japan
| | - T Oshima
- Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - M Kato
- National Hospital Organization Hakodate Hospital, Hakodate, Japan
| | - T Furuta
- Center for Clinical Research, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - K Murakami
- Department of Gastroenterology, Oita University Faculty of Medicine, Oita, Japan
| | - T Chiba
- Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Iwate, Japan
| | - H Miwa
- Division of Gastroenterology, Department of Internal Medicine, Hyogo College of Medicine, Hyogo, Japan
| | - Y Kinoshita
- Department of Gastroenterology and Hepatology, Shimane University School of Medicine, Izumo, Japan
| | - K Higuchi
- Second Department of Internal Medicine, Osaka Medical College, Osaka, Japan
| | - M Kusano
- Department of Endoscopy and Endoscopic Surgery, Gunma University Hospital, Maebashi, Gunma, Japan
| | - R Iwakiri
- Department of Internal Medicine, Saga Medical School, Saga, Japan
| | - K Fujimoto
- Department of Internal Medicine, Saga Medical School, Saga, Japan
| | - J F Tack
- University Hospitals Leuven, Leuven, Belgium
| | - T Arakawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
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Akizuki R, Maruhashi R, Eguchi H, Kitabatake K, Tsukimoto M, Furuta T, Matsunaga T, Endo S, Ikari A. Decrease in paracellular permeability and chemosensitivity to doxorubicin by claudin-1 in spheroid culture models of human lung adenocarcinoma A549 cells. Biochim Biophys Acta Mol Cell Res 2018; 1865:769-780. [PMID: 29524521 DOI: 10.1016/j.bbamcr.2018.03.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 02/07/2018] [Accepted: 03/02/2018] [Indexed: 12/19/2022]
Abstract
Chemotherapy resistance is a major problem in the treatment of cancer, but the underlying mechanisms are not fully understood. We found that the expression levels of claudin-1 (CLDN1) and 3, tight junctional proteins, are upregulated in cisplatin (CDDP)-resistant human lung adenocarcinoma A549 (A549R) cells. A549R cells showed cross-resistance to doxorubicin (DXR). Here, the expression mechanism and function of CLDN1 and 3 were examined. CLDN1 and 3 were mainly localized at tight junctions concomitant with zonula occludens (ZO)-1, a scaffolding protein, in A549 and A549R cells. The phosphorylation levels of Src, MEK, ERK, c-Fos, and Akt in A549R cells were higher than those in A549 cells. The expression levels of CLDN1 and 3 were decreased by LY-294002, a phosphoinositide 3-kinase (PI3K) inhibitor, and BAY 11-7082, an NF-κB inhibitor. The overexpression of CLDN1 and 3 decreased the paracellular permeability of DXR in A549 cells. Hypoxia levels in A549R and CLDN1-overexpressing cells (CLDN1/A549) were greater than those in A549, mock/A549, and CLDN3/A549 cells in a spheroid culture model. In contrast, accumulation in the region inside the spheroids and the toxicity of DXR in A549R and CLDN1/A549 cells were lower than those in other cells. Furthermore, the accumulation and toxicity of DXR were rescued by CLDN1 siRNA in A549R cells. We suggest that CLDN1 is upregulated by CDDP resistance through activation of a PI3K/Akt/NF-κB pathway, resulting in the inhibition of penetration of anticancer drugs into the inner area of spheroids.
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Affiliation(s)
- Risa Akizuki
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan
| | - Ryohei Maruhashi
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan
| | - Hiroaki Eguchi
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan
| | - Kazuki Kitabatake
- Department of Radiation Biosciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Japan
| | - Mitsutoshi Tsukimoto
- Department of Radiation Biosciences, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Japan
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Japan
| | - Toshiyuki Matsunaga
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan
| | - Satoshi Endo
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan
| | - Akira Ikari
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Japan.
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Sonoki H, Tanimae A, Furuta T, Endo S, Matsunaga T, Ichihara K, Ikari A. Caffeic acid phenethyl ester down-regulates claudin-2 expression at the transcriptional and post-translational levels and enhances chemosensitivity to doxorubicin in lung adenocarcinoma A549 cells. J Nutr Biochem 2018; 56:205-214. [PMID: 29597147 DOI: 10.1016/j.jnutbio.2018.02.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 09/01/2017] [Revised: 01/30/2018] [Accepted: 02/22/2018] [Indexed: 12/18/2022]
Abstract
Claudin-2 is highly expressed in human lung adenocarcinoma cells and involved in the promotion of proliferation. Here, we searched for a compound, which can decrease claudin-2 expression using lung adenocarcinoma A549 cells. In the screening using compounds included in royal jelly and propolis, the protein level of claudin-2 was dose-dependently decreased by caffeic acid phenethyl ester (CAPE), whereas the mRNA level and promoter activity were only decreased by 50 μM CAPE. These results suggest that CAPE down-regulates claudin-2 expression mediated by two different mechanisms. CAPE (50 μM) decreased the level of p-NF-κB, whereas it increased that of IκB. The CAPE-induced decrease in promoter activity of claudin-2 was blocked by the mutation in an NF-κB-binding site. The inhibition of NF-κB may be involved in the decrease in mRNA level of claudin-2. The CAPE (10 μM)-induced decrease in claudin-2 expression was inhibited by chloroquine, a lysosomal inhibitor. CAPE increased the expression and activity of protein phosphatase (PP) 1 and 2A. The CAPE-induced decrease in claudin-2 expression was blocked by cantharidin, a potent PPs inhibitor. The cell proliferation was suppressed by CAPE, which was partially rescued by ectopic expression of claudin-2. In addition, the toxicity and accumulation of doxorubicin in 3D spheroid cells were enhanced by CAPE, which was inhibited by ectopic expression of claudin-2. Taken together, CAPE down-regulates claudin-2 expression at the transcriptional and post-translational levels, and enhances sensitivity of cells to doxorubicin in 3D culture conditions. CAPE may be a useful adjunctive compound in the treatment of lung adenocarcinoma.
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Affiliation(s)
- Hiroyuki Sonoki
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Asami Tanimae
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan
| | - Satoshi Endo
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Toshiyuki Matsunaga
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan
| | - Kenji Ichihara
- Nagaragawa Research Center, API Co., Ltd., Gifu 502-0071, Japan
| | - Akira Ikari
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
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Arai K, Ueda Y, Morisaki K, Furuta T, Sasamori T, Tokitoh N, Kawabata T. Intermolecular chemo- and regioselective aromatic C-H amination of alkoxyarenes promoted by rhodium nitrenoids. Chem Commun (Camb) 2018; 54:2264-2267. [PMID: 29435532 DOI: 10.1039/c7cc09952e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Intermolecular aromatic C(sp2)-H amination promoted by neutral rhodium nitrenoids has been developed. The reactions proceeded with various oxygen-substituted arenes (1.5 equiv.) in a chemo- and regioselective manner. The aromatic C(sp2)-H amination took place at the para position of the oxygen substituent in the presence of benzylic C(sp3)-H bonds and/or C(sp3)-H bonds α to ethereal oxygen.
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Affiliation(s)
- Kenta Arai
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
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35
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Tani S, Watanabe H, Naito Y, Sakusabe T, Watanabe H, Nakaya J, Sasaki F, Numano T, Furuta T, Furuta T, Kimura M. High Speed Clinical Data Retrieval System with Event Time Sequence Feature. Methods Inf Med 2018; 47:560-8. [DOI: 10.3414/me9125] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Summary
Objectives:
This paper illustrates a high speed clinical data retrieving system, from 10 years of data of operating hospital information system for the purposes of research, evidence creation, patient safety, etc., even incorporating time sequence of causal relations.
Methods:
Total of 73,709,298 records of 10 years at Hamamatsu University Hospital (as of June 2008) are sent from HIS to retrieval system in HL7 v2.5 format. Hierarchical variable length database is used to install them.
Results:
A search for “listing patients who were prescribed Pravastatin (Mevalotin and generic drugs, any titer)” took 1.92 seconds. “Pravastatin (any) prescribed and recorded AST >150 within two weeks” took 112.22 seconds. Searching conditions can be set to be more complex, connected by Boolean operator and/or. This system called D*D is in operation at Hamamatsu University Hospital since August 2002. It is used for 48,518 times (monthly average of 703 searches). Neither searching, nor background export of data from HIS caused delay of routine operating CPOE.
Conclusions:
Search database outside of routine operating CPOE, with daily export of order data in HL7 v2.5 format, is proved to provide excellent search environment without causing trouble. Hierarchical representation gives high-speed search response, especially with time sequence of events.
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36
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Furuta T. Design and Synthesis of Biaryl Amino Acids and Related Catalysts with Molecular Recognition Properties. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.122] [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: 11/06/2022]
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Kawabata T, Hyakutake R, Yoshimura T, Ueda Y, Hayashi K, Furuta T. Asymmetric Synthesis of β-Lactams by Intramolecular Conjugate Addition of Serine and Cysteine Derivatives via Memory of Chirality. HETEROCYCLES 2018. [DOI: 10.3987/com-18-s(t)95] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Takeda H, Nakashima Y, Hosoi K, Ichimura K, Furuta T, Tomam M, Hatayama A, Ueda H, Yoshikawa M, Sakamoto M, Ichimura M, Imai T. Numerical Simulation Study for Background Plasma in the GAMMA 10 End-Mirror Cell. Fusion Science and Technology 2017. [DOI: 10.13182/fst13-a16972] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Takeda
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - K. Hosoi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - K. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - T. Furuta
- Science and Technology, Keio University, Yokohama, Kanagawa,223-8522
| | - M. Tomam
- Science and Technology, Keio University, Yokohama, Kanagawa,223-8522
| | - A. Hatayama
- Science and Technology, Keio University, Yokohama, Kanagawa,223-8522
| | - H. Ueda
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - M. Sakamoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
| | - T. Imai
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki, 305-8577
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Sawada Y, Toma M, Homma Y, Sato W, Furuta T, Yamoto S, Hatayama A. Modeling of Impurity Classical/Neoclassical Transport by Monte-Carlo Binary Collision Model. Fusion Science and Technology 2017. [DOI: 10.13182/fst13-a16952] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Sawada
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - M. Toma
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Y. Homma
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - W. Sato
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - T. Furuta
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - S. Yamoto
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - A. Hatayama
- Graduate school of Science and Technology, Keio University3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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Furuta T, Takeda H, Toma M, Sato W, Homma Y, Sawada Y, Nakashima Y, Hatayama A. Modeling of Plasma Transport in the Magnetic Mirror Configuration (GAMMA 10). Fusion Science and Technology 2017. [DOI: 10.13182/fst13-a16971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Furuta
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
| | - H. Takeda
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - M. Toma
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
| | - W. Sato
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
| | - Y. Homma
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
| | - Y. Sawada
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - A. Hatayama
- Graduate school of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama 223-8522, Japan
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Noguchi-Watanabe M, Sakurai K, Matsumoto Y, Yoshie S, Furuta T, Matsukura A, Ayako S, Yamamoto-Mitani N. EFFECT OF A WORKSHOP FOR HOMECARE PROVIDERS TO PROMOTE INTERPROFESSIONAL COLLABORATION IN JAPAN. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.5109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
| | | | | | | | | | | | - S. Ayako
- Kashiwa city, Kashiwa city, Japan
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Yamanaka T, Hirota Y, Oda A, Furuta T, Yoshie S, Matsumoto Y, Iijima K, Akishita M. FACTORS RELATED TO QOL AND WELL-BEING OF THE ELDERLY WHO NEED HOME CARE AND THEIR CAREGIVERS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4168] [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: 11/14/2022] Open
Affiliation(s)
- T. Yamanaka
- Center for Home Care Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan,
| | - Y. Hirota
- Center for Home Care Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan,
| | - A. Oda
- Home Clinic Kashiwa, Kashiwa, Japan,
| | | | - S. Yoshie
- Center for Home Care Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan,
| | - Y. Matsumoto
- Center for Home Care Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan,
| | - K. Iijima
- Institute of Gerontology, The University of Tokyo, Tokyo, Japan,
| | - M. Akishita
- Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Ono T, Date I, Imaoka T, Shingo T, Furuta T, Asari S, Ohmoto T. Evaluation of Intracerebral Grafting of Dopamine-Secreting PC12 Cells into Allogeneic and Xenogeneic Brain. Cell Transplant 2017; 6:511-3. [PMID: 9331503 DOI: 10.1177/096368979700600512] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The PC12 pheochromocytoma tumor cell line is derived from a rat adrenal medullary tumor and secretes dopamine. We have previously reported that grafted microencapsulated PC12 cells using agarose and poly(styrene sulfonic acid) survived in the xenogeneic brain without immunosuppression. To investigate whether unencapsulated PC12 cells form a tumor and how they provoke immunological reaction, PC12 cell suspension was implanted into the striatum of Sprague-Dawley rat (allogeneic graft) or guinea pig (xenogeneic graft) and histological analysis using Nissl stain and immunocytochemical analysis using antityrosine hydroxylase (TH) antibody were performed 1, 2, and 4 wk after transplantation. Host animals were not immunosuppressed. PC12 cells formed a mass 1 and 2 wk after transplantation both in allogeneic and xenogeneic brain. These grafted PC12 cells were immunoreactive to anti-TH antibody. Four weeks after transplantation, however, grafted PC12 cells in the allogeneic brain were only found within the restricted area near the site of implantation. In the xenogeneic brain, only the trace of grafted PC12 cells were found around the site of implantation 4 wk after transplantation. In both allogeneic and xenogeneic animals, a number of lymphocytes were found in and around the grafts at all period investigated. These findings indicate that PC12 cells could survive in the allogeneic or xenogeneic brain for 2 wk and were ultimately rejected by immunological reaction by 4 wk after transplantation. Implantation of encapsulated PC12 cells in the allogeneic or xenogeneic brain is considered a safe and effective method for delivering dopamine into the brain because PC12 cells will not form a tumor in the long-term even if capsules are damaged in some reason.
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Affiliation(s)
- T Ono
- Department of Neurological Surgery, Okayama University Medical School, Japan
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Marunaka K, Furukawa C, Fujii N, Kimura T, Furuta T, Matsunaga T, Endo S, Hasegawa H, Anzai N, Yamazaki Y, Yamaguchi M, Ikari A. The RING finger- and PDZ domain-containing protein PDZRN3 controls localization of the Mg 2+ regulator claudin-16 in renal tube epithelial cells. J Biol Chem 2017. [PMID: 28623232 DOI: 10.1074/jbc.m117.779405] [Citation(s) in RCA: 19] [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: 11/06/2022] Open
Abstract
Ion exchange in the renal tubules is fundamental to the maintenance of physiological ion levels. Claudin-16 (CLDN16) regulates the paracellular reabsorption of Mg2+ in the thick ascending limb of Henle's loop in the kidney, with dephosphorylation of CLDN16 increasing its intracellular distribution and decreasing paracellular Mg2+ permeability. CLDN16 is located in the tight junctions, but the mechanism regulating its localization is unclear. Using yeast two-hybrid systems, we found that CLDN16 binds to PDZRN3, a protein containing both RING-finger and PDZ domains. We also observed that the carboxyl terminus of the cytoplasmic CLDN16 region was required for PDZRN3 binding. PZDRN3 was mainly distributed in the cytosol of rat kidney cells and upon cell treatment with the protein kinase A inhibitor H-89, colocalized with CLDN16. H-89 also increased mono-ubiquitination and the association of CLDN16 with PDZRN3. Mono-ubiquitination levels of a K275A mutant were lower, and its association with PDZRN3 was reduced compared with wild-type (WT) CLDN16 and a K261A mutant, indicating that Lys-275 is the major ubiquitination site. An S217A mutant, a dephosphorylated form of CLDN16, localized to the cytosol along with PDZRN3 and the endosomal marker Rab7. PDZRN3 siRNA increased cell-surface localization of WT CLDN16 in H-89-treated cells or containing the S217A mutant and also suppressed CLDN16 endocytosis. Of note, H-89 decreased paracellular Mg2+ flux in WT CLDN16 cells, and PDZRN3 siRNA increased Mg2+ flux in the H-89-treated WT CLDN16 and S217A mutant cells. These results suggest that PDZRN3 mediates endocytosis of dephosphorylated CLDN16 and represents an important component of the CLDN16-trafficking machinery in the kidney.
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Affiliation(s)
- Kana Marunaka
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196
| | - Chisa Furukawa
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196
| | - Naoko Fujii
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196
| | - Toru Kimura
- Department of Pharmacology and Toxicology, Kyorin University School of Medicine, Tokyo 181-8611
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Kyoto 611-0011
| | - Toshiyuki Matsunaga
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196
| | - Satoshi Endo
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196
| | - Hajime Hasegawa
- Saitama Medical Center, Saitama Medical University, Saitama 350-8550
| | - Naohiko Anzai
- Department of Pharmacology, Chiba University Graduate School of Medicine, Chiba 321-0293
| | - Yasuhiro Yamazaki
- School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Masahiko Yamaguchi
- School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Akira Ikari
- Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196.
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45
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Sonoki H, Tanimae A, Endo S, Matsunaga T, Furuta T, Ichihara K, Ikari A. Kaempherol and Luteolin Decrease Claudin-2 Expression Mediated by Inhibition of STAT3 in Lung Adenocarcinoma A549 Cells. Nutrients 2017; 9:nu9060597. [PMID: 28608828 PMCID: PMC5490576 DOI: 10.3390/nu9060597] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Revised: 06/03/2017] [Accepted: 06/10/2017] [Indexed: 12/12/2022] Open
Abstract
Claudin-2 is highly expressed in human lung adenocarcinoma tissues and may be a novel target for cancer chemotherapy because knockdown of claudin-2 decreases cell proliferation. We found that flavonoids including kaempferol, chrysin, and luteolin concentration-dependently decrease claudin-2 expression in lung adenocarcinoma A549 cells. Claudin-2 expression is up-regulated by mitogen-activated protein kinase kinase (MEK)/ extracellular signal-regulated kinase (ERK)/c-Fos and phosphoinositide 3-kinase (PI3K)/Akt/nuclear factor-κB (NF-κB) pathways, but these activities were not inhibited by kaempferol, chrysin, and luteolin. Promoter deletion assay using luciferase reporter vector showed that kaempferol and luteolin inhibit the function of transcriptional factor that binds to the region between −395 and −144 of claudin-2 promoter. The decrease in promoter activity was suppressed by mutation in signal transducers and activators of transcription (STAT)-binding site, which is located between −395 and −144. The phosphorylation level of STAT3 was not decreased, but the binding of STAT3 on the promoter region is suppressed by kaempferol and luteolin in chromatin immunoprecipitation assay. The inhibition of cell proliferation caused by kaempferol and luteolin was partially recovered by ectopic claudin-2 expression. Taken together, kaempferol and luteolin decreased claudin-2 expression and proliferation in A549 cells mediated by the inhibition of binding of STAT3 on the promoter region of claudin-2. The intake of foods and nutrients rich in these flavonoids may prevent lung adenocarcinoma development.
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Affiliation(s)
- Hiroyuki Sonoki
- From the Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
| | - Asami Tanimae
- From the Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
| | - Satoshi Endo
- From the Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
| | - Toshiyuki Matsunaga
- From the Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan.
| | - Kenji Ichihara
- Nagaragawa Research Center, API Co., Ltd., Gifu 502-0071, Japan.
| | - Akira Ikari
- From the Laboratory of Biochemistry, Department of Biopharmaceutical Sciences, Gifu Pharmaceutical University, Gifu 501-1196, Japan.
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Yanagi M, Imayoshi A, Ueda Y, Furuta T, Kawabata T. Carboxylate Anions Accelerate Pyrrolidinopyridine (PPy)-Catalyzed Acylation: Catalytic Site-Selective Acylation of a Carbohydrate by in Situ Counteranion Exchange. Org Lett 2017; 19:3099-3102. [DOI: 10.1021/acs.orglett.7b01213] [Citation(s) in RCA: 30] [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: 01/22/2023]
Affiliation(s)
- Masanori Yanagi
- Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Ayumi Imayoshi
- Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Yoshihiro Ueda
- Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Takumi Furuta
- Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan
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47
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Nakada M, Dong Y, Furuta T, Sabit H, Kitabayashi T, Jiapaer S, Hirao A. P01.22 Identification of antipsychotic drug fluspirilene as a potential anti-glioma drug. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.098] [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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48
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Yoshida K, Hirata A, Hashimoto H, Imayoshi A, Ueda Y, Furuta T, Kawabata T. Organocatalytic chemoselective monoacylation of 1,n-linear disulfonamides. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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49
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Takeuchi H, Ueda Y, Furuta T, Kawabata T. Total Synthesis of Ellagitannins via Sequential Site-Selective Functionalization of Unprotected D-Glucose. Chem Pharm Bull (Tokyo) 2017; 65:25-32. [PMID: 28049912 DOI: 10.1248/cpb.c16-00436] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A short-step total synthesis of the natural glycosides pterocarinin C and tellimagrandin II (eugeniin) has been performed by sequential and site-selective functionalization of free hydroxy groups of unprotected D-glucose. The key reactions are β-selective glycosidation of a gallic acid derivative using unprotected D-glucose as a glycosyl donor and catalyst-controlled site-selective introduction of a galloyl group into the inherently less reactive hydroxy group of the glucoside.
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50
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Kasamatsu K, Yoshimura T, Mandi A, Taniguchi T, Monde K, Furuta T, Kawabata T. α-Arylation of α-Amino Acid Derivatives with Arynes via Memory of Chirality: Asymmetric Synthesis of Benzocyclobutenones with Tetrasubstituted Carbon. Org Lett 2017; 19:352-355. [DOI: 10.1021/acs.orglett.6b03533] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Koji Kasamatsu
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Tomoyuki Yoshimura
- Faculty
of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical,
and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Attila Mandi
- Frontier
Research Center for Advanced Material and Life Science, Faculty of
Advanced Life Science, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Tohru Taniguchi
- Frontier
Research Center for Advanced Material and Life Science, Faculty of
Advanced Life Science, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Kenji Monde
- Frontier
Research Center for Advanced Material and Life Science, Faculty of
Advanced Life Science, Hokkaido University, Kita 21 Nishi 11, Sapporo 001-0021, Japan
| | - Takumi Furuta
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Japan
| | - Takeo Kawabata
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Japan
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