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Nakano T, Kousaka N, Nakayama A, Kato Y, Takashima K, Tanabe G, Yoshimatsu M. Radical Nitrososulfonation of Propargyl Alcohols: Thiazolidine-2,4-dione-Assisted Synthesis of 5-Alykyl-4-sulfonylisoxazoles. Org Lett 2024; 26:1753-1757. [PMID: 38411088 DOI: 10.1021/acs.orglett.3c03674] [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: 02/28/2024]
Abstract
In this study, we discover a good NO/HNO precursor, N-hydroxypyridinesulfonamide, and the regioselective radical nitrososulfonylation reaction of propargyl alcohols. Direct and unique isoxazole synthesis afforded a good-to-high yield of 5-alkyl-3-aryl-4-pyridinesulfonylisoxazoles. Copper-catalyzed aerobic oxidation could efficiently proceed in the presence of thiazolidine-2,4-dione. This work provides a powerful method for the synthesis and functionalization of alkyl-substituted isoxazoles and explores a new investigation route for drug-drug discovery.
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Affiliation(s)
- Tomoki Nakano
- Department of Chemistry, Faculty of Education, Gifu University, Yan-agido 1-1, Gifu 501-1193, Japan
| | - Nami Kousaka
- Department of Chemistry, Faculty of Education, Gifu University, Yan-agido 1-1, Gifu 501-1193, Japan
| | - Aoi Nakayama
- Department of Chemistry, Faculty of Education, Gifu University, Yan-agido 1-1, Gifu 501-1193, Japan
| | - Yoshiaki Kato
- Department of Chemistry, Faculty of Education, Gifu University, Yan-agido 1-1, Gifu 501-1193, Japan
| | - Katsuki Takashima
- Faculty of Pharmacy, Kinki University, 3-4-1 Kowakae, 577-8502 Higashi-osaka, Osaka Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kinki University, 3-4-1 Kowakae, 577-8502 Higashi-osaka, Osaka Japan
| | - Mitsuhiro Yoshimatsu
- Department of Chemistry, Faculty of Education, Gifu University, Yan-agido 1-1, Gifu 501-1193, Japan
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Takashima K, Nakamura S, Nagayama M, Marumoto S, Ishikawa F, Xie W, Nakanishi I, Muraoka O, Morikawa T, Tanabe G. Role of the thiosugar ring in the inhibitory activity of salacinol, a potent natural α-glucosidase inhibitor. RSC Adv 2024; 14:4471-4481. [PMID: 38312722 PMCID: PMC10835759 DOI: 10.1039/d3ra08485j] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/23/2024] [Indexed: 02/06/2024] Open
Abstract
Herein, ring-cleaved (24) and truncated (25) analogues of an azasugar, 1-deoxynojirimycin (23), exhibited inhibitory activity (Ki = 4-10 μM) equal to that of the parent compound (1, Ki = 14 μM). Based on this structure-activity relationship (SAR), four ring-cleaved (26a-26c and 27c) and three truncated (28a-28c) analogues of salacinol (1), a potent thiosugar-ring-containing α-glucosidase inhibitor, were synthesised. Bioassay results revealed that all the synthetics were inactive, indicating that the 5-membered thiosugar ring of 1 played an essential role in the potent activities of sulfonium-type inhibitors. The present findings are interesting and important in understanding the function of salacinol, considering that the observed inhibitory activity trend was contrary to the SAR observed in aza-compounds (23, 24, and 25) in a previous study, which suggested that the cyclic structure did not contribute to their strong inhibitory activity.
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Affiliation(s)
- Katsuki Takashima
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Shinya Nakamura
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Maiko Nagayama
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Shinsuke Marumoto
- Joint Research Centre, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Fumihiro Ishikawa
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Weijia Xie
- State Key Laboratory of Natural Medicines, Department of Medicinal Chemistry, China Pharmaceutical University Nanjing 2100009 P. R. China
| | - Isao Nakanishi
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Osamu Muraoka
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Toshio Morikawa
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae, Higashi-osaka Osaka 577-8502 Japan
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Takashima K, Asai A, Ashidate M, Suzuki R, Marumoto S, Ishikawa F, Morikawa T, Tanabe G. Total Synthesis of Calanthoside, a Potential Hair Growth Stimulant: A Facile Synthetic Approach via One-Pot S- and O-Glucosidic Bond Formation. J Nat Prod 2023; 86:2672-2684. [PMID: 37964561 DOI: 10.1021/acs.jnatprod.3c00815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
The first total synthesis of calanthoside (1), which exhibits potent proliferative activity against human hair follicle dermal papilla cells, has been achieved in seven steps with an overall yield of 43% on a gram scale starting from anthranilic acid (11). The synthetic strategy features a one-pot process involving thioglucoside bond formation via nucleophilic substitution reaction and enol-glucosylation for building the S-,O-bisdesmoside structure of 1. Moreover, the one-pot reaction showed broad substrate adaptability to several sugar donors other than d-glucose, thus affording S,O-bisglycoside intermediates in ∼84% yield.
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Ishikawa F, Tsukumo N, Morishita E, Asamizu S, Kusuhara S, Marumoto S, Takashima K, Onaka H, Tanabe G. Biosynthetic diversification of non-ribosomal peptides through activity-based protein profiling of adenylation domains. Chem Commun (Camb) 2023; 59:9473-9476. [PMID: 37477345 DOI: 10.1039/d3cc02633g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
We describe activity-based protein profiling for analyzing the adenylation domains of non-ribosomal peptide synthetases (ABPP-NRPS) in bacterial proteomes. Using a range of non-proteoinogenic amino acid sulfamoyladenosines, the competitive format of ABPP-NRPS provided substrate tolerance toward non-proteinogenic amino acids. When coupled with precursor-directed biosynthesis, a non-proteinogenic amino acid (O-allyl-L-serine) was successfully incorporated into gramicidin S.
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Affiliation(s)
- Fumihiro Ishikawa
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Natsumi Tsukumo
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Erika Morishita
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Shumpei Asamizu
- Graduate School of Agricultural and Life Sciences and Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
| | - Saaya Kusuhara
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Shinsuke Marumoto
- Joint Research Center, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan
| | - Katsuki Takashima
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
| | - Hiroyasu Onaka
- Graduate School of Agricultural and Life Sciences and Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan.
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Takashima K, Teramachi M, Marumoto S, Ishikawa F, Manse Y, Morikawa T, Tanabe G. Structure–activity relationship study of 4,5-didehydroguadiscine, an aporphine alkaloid showing potent melanogenesis-inhibitory activity in B16 melanoma cells. Bioorg Med Chem Lett 2022; 78:129034. [DOI: 10.1016/j.bmcl.2022.129034] [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] [Received: 08/05/2022] [Revised: 10/03/2022] [Accepted: 10/17/2022] [Indexed: 11/02/2022]
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Takashima K. Total Synthesis of C19 Diterpene Alkaloid Talatisamine. J SYN ORG CHEM JPN 2022. [DOI: 10.5059/yukigoseikyokaishi.80.691] [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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Takashima K, Okada T, Kato A, Yamasaki Y, Sugouchi T, Akanuma S, Kubo Y, Hosoya K, Morita H, Ito T, Kodama T, Tanabe G, Toyooka N. Divergent Synthesis of Decahydroquinoline‐Type Poison‐Frog Alkaloids. ChemistrySelect 2022. [DOI: 10.1002/slct.202104533] [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: 11/08/2022]
Affiliation(s)
- Katsuki Takashima
- Faculty of Engineering University of Toyama 3190 Gofuku Toyama 930–8555 Japan
| | - Takuya Okada
- Faculty of Engineering University of Toyama 3190 Gofuku Toyama 930–8555 Japan
- Graduate School of Innovative Life Science University of Toyama 3190 Gofuku Toyama 930–8555 Japan
| | - Atsushi Kato
- Department of Hospital Pharmacy University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Yuhei Yamasaki
- Faculty of Pharmaceutical Sciences University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Takeshi Sugouchi
- Faculty of Pharmaceutical Sciences University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Shin‐ichi Akanuma
- Faculty of Pharmaceutical Sciences University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Yoshiyuki Kubo
- Faculty of Pharmaceutical Sciences University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Ken‐ichi Hosoya
- Faculty of Pharmaceutical Sciences University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Hiroyuki Morita
- Institute of Natural Medicine University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Takuya Ito
- Institute of Natural Medicine University of Toyama 2630 Sugitani Toyama 930–0194 Japan
- Faculty of Pharmacy Osaka Ohtani University Tondabayashi Osaka 584–8540 Japan
| | - Takeshi Kodama
- Institute of Natural Medicine University of Toyama 2630 Sugitani Toyama 930–0194 Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy Kindai University 3–4-1 Kowakae Higashi-osaka Osaka 577–8502 Japan
| | - Naoki Toyooka
- Faculty of Engineering University of Toyama 3190 Gofuku Toyama 930–8555 Japan
- Graduate School of Innovative Life Science University of Toyama 3190 Gofuku Toyama 930–8555 Japan
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Okada T, Wu N, Takashima K, Ishimura J, Morita H, Ito T, Kodama T, Yamasaki Y, Akanuma SI, Kubo Y, Hosoya KI, Tsuneki H, Wada T, Sasaoka T, Shimizu T, Sakai H, Dwoskin LP, Hussaini SR, Saporito RA, Toyooka N. Total Synthesis of Decahydroquinoline Poison Frog Alkaloids ent- cis-195A and cis-211A. Molecules 2021; 26:molecules26247529. [PMID: 34946611 PMCID: PMC8706607 DOI: 10.3390/molecules26247529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/18/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 11/21/2022] Open
Abstract
The total synthesis of two decahydroquinoline poison frog alkaloids ent-cis-195A and cis-211A were achieved in 16 steps (38% overall yield) and 19 steps (31% overall yield), respectively, starting from known compound 1. Both alkaloids were synthesized from the common key intermediate 11 in a divergent fashion, and the absolute stereochemistry of natural cis-211A was determined to be 2R, 4aR, 5R, 6S, and 8aS. Interestingly, the absolute configuration of the parent decahydroquinoline nuclei of cis-211A was the mirror image of that of cis-195A, although both alkaloids were isolated from the same poison frog species, Oophaga (Dendrobates) pumilio, from Panama.
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Affiliation(s)
- Takuya Okada
- Graduate School of Innovative Life Science, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
- Correspondence: (T.O.); (N.T.); Tel.: +81-76-445-6859 (N.T.)
| | - Naizhen Wu
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Katsuki Takashima
- Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan; (K.T.); (J.I.)
| | - Jungoh Ishimura
- Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan; (K.T.); (J.I.)
| | - Hiroyuki Morita
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (H.M.); (T.I.); (T.K.)
| | - Takuya Ito
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (H.M.); (T.I.); (T.K.)
- Faculty of Pharmacy, Osaka Ohtani University, Tondabayashi, Osaka 584-8540, Japan
| | - Takeshi Kodama
- Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (H.M.); (T.I.); (T.K.)
| | - Yuhei Yamasaki
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Shin-ichi Akanuma
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Yoshiyuki Kubo
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Ken-ichi Hosoya
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Hiroshi Tsuneki
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Tsutomu Wada
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Toshiyasu Sasaoka
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Takahiro Shimizu
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Hideki Sakai
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan; (N.W.); (Y.Y.); (S.-i.A.); (Y.K.); (K.-i.H.); (H.T.); (T.W.); (T.S.); (T.S.); (H.S.)
| | - Linda P. Dwoskin
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA;
| | - Syed R. Hussaini
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 S. Tucker Dr., Tulsa, OK 74104, USA;
| | - Ralph A. Saporito
- Department of Biology, John Carroll University, University Heights, OH 44118, USA;
| | - Naoki Toyooka
- Graduate School of Innovative Life Science, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
- Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan; (K.T.); (J.I.)
- Correspondence: (T.O.); (N.T.); Tel.: +81-76-445-6859 (N.T.)
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Ideta S, Johnston S, Yoshida T, Tanaka K, Mori M, Anzai H, Ino A, Arita M, Namatame H, Taniguchi M, Ishida S, Takashima K, Kojima KM, Devereaux TP, Uchida S, Fujimori A. Hybridization of Bogoliubov Quasiparticles between Adjacent CuO_{2} Layers in the Triple-Layer Cuprate Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{10+δ} Studied by Angle-Resolved Photoemission Spectroscopy. Phys Rev Lett 2021; 127:217004. [PMID: 34860085 DOI: 10.1103/physrevlett.127.217004] [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] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 07/08/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Hybridization of Bogoliubov quasiparticles (BQPs) between the CuO_{2} layers in the triple-layer cuprate high-temperature superconductor Bi_{2}Sr_{2}Cu_{2}Cu_{3}O_{10+δ} is studied by angle-resolved photoemission spectroscopy (ARPES). In the superconducting state, an anticrossing gap opens between the outer- and inner-BQP bands, which we attribute primarily to interlayer single-particle hopping with possible contributions from interlayer Cooper pairing. We find that the d-wave superconducting gap of both BQP bands smoothly develops with momentum without an abrupt jump in contrast to a previous ARPES study. Hybridization between the BQPs also gradually increases in going from the off nodal to the antinodal region, which is explained by the momentum dependence of the interlayer single-particle hopping. As possible mechanisms for the enhancement of the superconducting transition temperature, the hybridization between the BQPs as well as the combination of phonon modes of the triple CuO_{2} layers and spin fluctuations represented by a four-well model are discussed.
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Affiliation(s)
- S Ideta
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
- UVSOR-III Synchrotron, Institute for Molecular Science, Okazaki 444-8585, Japan
| | - S Johnston
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T Yoshida
- Department of Human and Environmental studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - K Tanaka
- UVSOR-III Synchrotron, Institute for Molecular Science, Okazaki 444-8585, Japan
| | - M Mori
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - H Anzai
- Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - A Ino
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
- Department of Education and Creation Engineering, Kurume Institute of Technology, Fukuoka 2286-66, Japan
| | - M Arita
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - H Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - M Taniguchi
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - S Ishida
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - K Takashima
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - K M Kojima
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
- J-PARC Center and Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan
- Centre for Molecular and Materials Science, TRIUMF, 4004 Vancouver, Canada
| | - T P Devereaux
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory and Stanford University, Menlo Park, California 94025, USA
- Department of Materials Science and Engineering Stanford University, Stanford, California 94305, USA
| | - S Uchida
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - A Fujimori
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Applied Physics, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
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Ishikawa F, Konno S, Takashima K, Kakeya H, Tanabe G. Inhibition of efflux pumps aids small-molecule probe-based fluorescence labeling and imaging in the Gram-negative bacterium Escherichia coli. Org Biomol Chem 2021; 19:8906-8911. [PMID: 34704577 DOI: 10.1039/d1ob01112j] [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: 11/21/2022]
Abstract
A major challenge in fluorescence imaging experiments, which are essential to determine protein activity, expression, and localization, is the penetration of small-molecule probes through the outer membrane permeability barrier of bacteria. Here, we describe a novel strategy for small-molecule probe-based fluorescence protein labeling and imaging in the Gram-negative bacterium Escherichia coli. We targeted a siderophore enterobactin biosynthetic enzyme EntE in E. coli. When coupled with an efflux pump inhibitor carbonyl cyanide m-chlorophenylhydrazone, small-molecule probes were able to efficiently enter the cells, leading to the fluorescence labeling and imaging of overproduced EntE in E. coli. This study demonstrates that the combination of small-molecule probes with appropriate efflux pump inhibitors may substantially enhance their interaction with the target proteins in live bacteria.
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Affiliation(s)
- Fumihiro Ishikawa
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Sho Konno
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Katsuki Takashima
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Hideaki Kakeya
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
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Ishikawa F, Konno S, Uchida C, Suzuki T, Takashima K, Dohmae N, Kakeya H, Tanabe G. Chemoproteomics profiling of surfactin-producing nonribosomal peptide synthetases in living bacterial cells. Cell Chem Biol 2021; 29:145-156.e8. [PMID: 34133952 DOI: 10.1016/j.chembiol.2021.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/06/2021] [Accepted: 05/26/2021] [Indexed: 01/09/2023]
Abstract
Much of our current knowledge on nonribosomal peptide synthetases (NRPSs) is based on studies in which the full NRPS system or each protein domain is expressed in heterologous hosts. Consequently, methods to detect the endogenous activity of NRPSs, under natural cellular conditions, are needed for the study of NRPS cell biology. Here, we describe the in vivo activity-based protein profiling (ABPP) for endogenous NRPSs and its applications to the study of their activities in bacteria. Remarkably, in vitro and in vivo ABPP in the context of the surfactin producer Bacillus subtilis enabled the visualization, tracking, and imaging of an endogenous SrfAB-NRPS with remarkable selectivity and sensitivity. Furthermore, in vivo, ABPP allowed the discovery of the degradation processes of the endogenous SrfAB-NRPS in the context of its native producer bacteria. Overall, this study deepens our understanding of the properties of NRPSs that cannot be addressed by conventional methods.
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Affiliation(s)
- Fumihiro Ishikawa
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Sho Konno
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Chiharu Uchida
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Takehiro Suzuki
- Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Katsuki Takashima
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Naoshi Dohmae
- Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hideaki Kakeya
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo, Kyoto 606-8501, Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
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12
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Iioka R, Yorozu K, Sakai Y, Kawai R, Hatae N, Takashima K, Tanabe G, Wasada H, Yoshimatsu M. Synthesis of Azepino[1,2‐
a
]indole‐10‐amines via [6+1] Annulation of Ynenitriles with Reformatsky Reagent. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Ryoya Iioka
- Department of Chemistry Faculty of Education Gifu University Yanagido 1–1 501-1193 Gifu Japan
| | - Kohei Yorozu
- Department of Chemistry Faculty of Education Gifu University Yanagido 1–1 501-1193 Gifu Japan
| | - Yoko Sakai
- Department of Chemistry Faculty of Education Gifu University Yanagido 1–1 501-1193 Gifu Japan
| | - Rika Kawai
- Department of Chemistry Faculty of Education Gifu University Yanagido 1–1 501-1193 Gifu Japan
| | - Noriyuki Hatae
- Faculty of Pharmaceutical Sciences Yokohama University of Pharmacy 601 Matano, Totsuka-ku 245-0066 Yokohama Kanagawa Japan
| | - Katsuki Takashima
- Faculty of Pharmacy Kinki University 3-4-1 Kowakae 577-8502 Higashi-osaka Osaka Japan
| | - Genzoh Tanabe
- Faculty of Pharmacy Kinki University 3-4-1 Kowakae 577-8502 Higashi-osaka Osaka Japan
| | - Hiroaki Wasada
- Department of Chemistry Faculty of Regional Study Gifu University Yanagido 1–1 501-1193 Gifu Japan
| | - Mitsuhiro Yoshimatsu
- Department of Chemistry Faculty of Education Gifu University Yanagido 1–1 501-1193 Gifu Japan
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13
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Ishikawa F, Kitayama H, Nakamura S, Takashima K, Nakanishi I, Tanabe G. Activity, Binding, and Modeling Studies of a Reprogrammed Aryl Acid Adenylation Domain with an Enlarged Substrate Binding Pocket. Chem Pharm Bull (Tokyo) 2021; 69:222-225. [PMID: 33518604 DOI: 10.1248/cpb.c20-00704] [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] [Indexed: 11/22/2022]
Abstract
The gatekeeping adenylation (A) domain of the non-ribosomal peptide synthetase (NRPS) selectively incorporates specific proteinogenic/non-proteinogenic amino acid into a growing peptide chain. The EntE of the enterobactin NRPS is a discrete aryl acid A-domain with 2,3-dihydroxybenzoic acid (DHB) substrate specificity. Reprogrammed EntE N235G variant possesses an enlarged substrate recognition site, and is capable of accepting non-native aryl acids. Biochemical characterization of this unique substrate recognition site should provide a better understanding of activi-site microenvironments. Here, we synthesized a non-hydrolysable adenylate analogue with 2-aminobenzoic acid (2-ABA), 3-aminobenzoic acid (3-ABA), and 4-aminobenzoic acid (4-ABA) and used them to calculate the apparent inhibition constants (Kiapp.). Dose-response experiments using 3-ABA-sulfamoyladenosine (AMS) provided Kiapp. values of 596 nM for wild-type EntE and 2.4 nM for the N235G variants. These results suggest that 3-amino group of benzoic acid plays an important role in substrate recognition by the N235G variant. These findings would help designing aryl acid substrates with substituents at the 2- and 3-positions.
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Affiliation(s)
- Fumihiro Ishikawa
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University
| | - Hinano Kitayama
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University
| | - Shinya Nakamura
- Computational Drug Design and Discovery Lab, Faculty of Pharmacy, Kindai University
| | - Katsuki Takashima
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University
| | - Isao Nakanishi
- Computational Drug Design and Discovery Lab, Faculty of Pharmacy, Kindai University
| | - Genzoh Tanabe
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University
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14
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Ishikawa F, Hirano A, Yoshimori Y, Nishida K, Nakamura S, Takashima K, Marumoto S, Ninomiya K, Nakanishi I, Xie W, Morikawa T, Muraoka O, Tanabe G. Ligand compatibility of salacinol-type α-glucosidase inhibitors toward the GH31 family. RSC Adv 2021; 11:3221-3225. [PMID: 35424309 PMCID: PMC8694024 DOI: 10.1039/d0ra10038b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 12/28/2020] [Indexed: 11/21/2022] Open
Abstract
We show that salacinol-type α-glucosidase inhibitors are ligand-compatible with the GH 31 family. Salacinol and its 3′-O-benzylated analogs inhibit human lysosomal α-glucosidase at submicromolar levels. Simple structure-activity relationship studies reveal that the salacinol side-chain stereochemistry significantly influences binding to GH31 α-glucosidases. Salacinol-type α-glucosidase inhibitors are ligand-compatible with the GH 31 family. Salacinol and its 3′-O-benzylated analogs inhibit human lysosomal α-glucosidase at submicromolar levels.![]()
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Affiliation(s)
- Fumihiro Ishikawa
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Aiko Hirano
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Yuuto Yoshimori
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Kana Nishida
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Shinya Nakamura
- Computational Drug Design and Discovery Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Katsuki Takashima
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Shinsuke Marumoto
- Joint Research Center, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Kiyofumi Ninomiya
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Isao Nakanishi
- Computational Drug Design and Discovery Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Weijia Xie
- State Key Laboratory of Natural Medicines, Department of Medicinal Chemistry, China Pharmaceutical University Nanjing 2100009 P. R. China
| | - Toshio Morikawa
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Osamu Muraoka
- Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Genzoh Tanabe
- Pharmaceutical Organic Chemistry Lab, Faculty of Pharmacy, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan.,Pharmaceutical Research and Technology Institute, Kindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
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15
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Ishikawa F, Nohara M, Takashima K, Tanabe G. Probing the Compatibility of an Enzyme-Linked Immunosorbent Assay toward the Reprogramming of Nonribosomal Peptide Synthetase Adenylation Domains. Chembiochem 2020; 21:3056-3061. [PMID: 32533653 DOI: 10.1002/cbic.202000206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/03/2020] [Revised: 04/28/2020] [Indexed: 01/26/2023]
Abstract
An important challenge in natural product biosynthesis is the biosynthetic design and production of artificial peptides. One of the most promising strategies is reprogramming adenylation (A) domains to expand the substrate repertoire of nonribosomal peptide synthetases (NRPSs). Therefore, the precise detection of subtle structural changes in the substrate binding pockets of A domains might accelerate their reprogramming. Here we show that an enzyme-linked immunosorbent assay (ELISA) using a combination of small-molecule probes can detect the effects of substrate binding pocket residue substitutions in A-domains. When coupled with a set of aryl acid A-domain variants (total of nine variants), the ELISA can analyze the subtle differences in their active-site architectures. Furthermore, the ELISA-based screening was able to identify the variants with substrate binding pockets that accepted a non-cognate substrate from an original pool of 45. These studies demonstrate that ELISA is a reliable platform for providing insights into the active-site properties of A-domains and can be applied for the reprogramming of NRPS A-domains.
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Affiliation(s)
- Fumihiro Ishikawa
- Laboratory of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Maya Nohara
- Laboratory of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Katsuki Takashima
- Laboratory of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
| | - Genzoh Tanabe
- Laboratory of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
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Takashima K, Yeoh GWJ, Chua HE, Ting PLM, Chong JY, Tan RKJ, Kaur N, Mohdar LH, Banerjee S, Chan RKW, Chen MI, Wong CS. Socioecological differences in factors associated with inconsistent condom use with female sex workers and casual partners: an observational study of heterosexual men attending an anonymous HIV testing clinic in Singapore. Sex Health 2019; 16:593-595. [PMID: 31615617 DOI: 10.1071/sh18230] [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: 12/03/2018] [Accepted: 05/02/2019] [Indexed: 11/23/2022]
Abstract
Sexual practices among heterosexual men may differ between female sex workers (FSWs) and casual partners. We surveyed 203 heterosexual men and investigated the attributes associated with inconsistent condom use among them. Lower educational attainment was positively associated with inconsistent condom use with FSWs (adjusted prevalence ratio (aPR) 2.63; P = 0.018) and casual partners (aPR 1.55; P = 0.022), whereas early age of sexual debut (aPR 3.00; P = 0.012) and alcohol use during sex (aPR 7.95; P < 0.001) were positively associated with inconsistent condom use with FSWs. Socioecological factors may explain such differences.
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Affiliation(s)
- K Takashima
- Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 11, Singapore 119228, Singapore
| | - G W J Yeoh
- Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 11, Singapore 119228, Singapore
| | - H E Chua
- Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 11, Singapore 119228, Singapore
| | - P L M Ting
- Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 11, Singapore 119228, Singapore
| | - J Y Chong
- Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 11, Singapore 119228, Singapore
| | - R K J Tan
- Saw Swee Hock School of Public Health, National University of Singapore, 12 Science Drive 2, #10-01, Singapore 117549, Singapore; and Corresponding author.
| | - N Kaur
- National Centre for Infectious Diseases, 16 Jalan Tan Tock Seng, Singapore 308442, Singapore
| | - L H Mohdar
- Action for AIDS Singapore, 9 Kelantan Lane #03-01, Singapore 208628, Singapore
| | - S Banerjee
- Action for AIDS Singapore, 9 Kelantan Lane #03-01, Singapore 208628, Singapore
| | - R K W Chan
- National Skin Centre, 1 Mandalay Road, Singapore 308205, Singapore
| | - M I Chen
- Saw Swee Hock School of Public Health, National University of Singapore, 12 Science Drive 2, #10-01, Singapore 117549, Singapore; and National Centre for Infectious Diseases, 16 Jalan Tan Tock Seng, Singapore 308442, Singapore
| | - C S Wong
- National Centre for Infectious Diseases, 16 Jalan Tan Tock Seng, Singapore 308442, Singapore
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Affiliation(s)
| | | | - Hiroaki Gouda
- School of Pharmacy, Showa University, Tokyo 142-8555, Japan
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18
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19
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Nakamura SI, Kim YH, Takashima K, Kimura A, Nagai K, Ichijo T, Sato S. Composition of the microbiota in forestomach fluids and feces of Japanese Black calves with white scours. J Anim Sci 2018; 95:3949-3960. [PMID: 28992019 DOI: 10.2527/jas2017.1431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The objective of this study was to characterize the composition of the forestomach and fecal microbiota in Japanese Black calves with white scours. Forestomach fluid, feces, and peripheral blood were collected from healthy calves ( = 5; age 10 ± 2 d) and scouring calves ( = 5; age 10 ± 1 d) on the day on which white scours occurred. The pH and concentrations of VFA, lactic acid, and ammonia nitrogen (NH-N) of the forestomach fluids were determined. Microbiota composition and gene copy numbers in the forestomach fluid and feces were analyzed by 454 pyrosequencing and quantitative real-time PCR (qPCR), respectively. The cytokine mRNA level in peripheral leukocytes was evaluated by qPCR. The pH of the forestomach fluid of the scouring calves tended to be higher than that of the healthy calves ( = 0.056). No significant difference was detected in the total VFA, lactic acid, or NH-N concentrations in the forestomach fluids of the 2 groups. Firmicutes, Bacteroidetes, and Proteobacteria were the predominant phyla in the forestomach fluid and feces. At the genus level, the relative abundance of in the forestomach fluid was significantly higher in the scouring calves ( < 0.05) and the relative abundance of in the feces was significantly higher than that in the forestomach in the healthy calves ( < 0.05). Furthermore, the bacterial diversity indices of feces were lower in the scouring calves. Quantitative PCR amplification using some of the primer pairs failed in the forestomach fluid and feces in both groups. These results suggested that fermentation in the forestomach may affect the occurrence of white scours, resulting in changes in the composition and diversity of the forestomach fluid and fecal microbiota in Japanese Black calves.
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Hisada S, Matsuda M, Takashima K, Yamabe-Mitarai Y. Structural analysis and martensitic transformation in equiatomic HfPd alloy. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2017.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Nakamura SI, Kim YH, Takashima K, Kimura A, Nagai K, Ichijo T, Sato S. Composition of the microbiota in forestomach fluids and feces of Japanese Black calves with white scours1. J Anim Sci 2017. [DOI: 10.2527/jas.2017.1431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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22
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Ohsawa S, Takashima K, Shibuya T, Yamamoto H. Recurrent haemarthroses after bilateral total knee arthroplasty for rheumatoid arthritis. Scand J Rheumatol 2015; 45:85-86. [PMID: 26402145 DOI: 10.3109/03009742.2015.1085086] [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: 11/13/2022]
Affiliation(s)
- S Ohsawa
- a Department of Physical Therapy , Osaka Yukioka College of Health Science , Osaka , Japan
| | - K Takashima
- b Department of Orthopaedic Surgery , Sumitomo Hospital , Osaka , Japan
| | - T Shibuya
- b Department of Orthopaedic Surgery , Sumitomo Hospital , Osaka , Japan
| | - H Yamamoto
- c Department of Radiology , Sumitomo Hospital , Osaka , Japan
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Satake H, Kotake T, Ito Y, Kitamoto H, Takashima K, Ogawa S, Masuo K, Fujita M, Inokuma T, Tsuji A. The Influence of KRAS Mutation Analysis Before Primary Chemotherapy for Unresectable and Recurrent Colorectal Cancer. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.131] [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: 11/14/2022] Open
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Matsumoto T, Ogawa S, Takashima K, Masuo K, Fukushima M, Wada M, Shimeno N, Inoue S, Tei H, Fujita M, Suginoshita Y, Okada A, Inokuma T. Clinical Analysis of Pericarditis Carcinomatosa in our Hospital. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32528-x] [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: 11/26/2022] Open
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Abstract
AbstractFatigue crack propagation tests at different stress ratios of 0.1 and 0.5 have been performed on microsized Ni-P amorphous alloy specimens to investigate the influence of stress ratio in the crack growth properties of microsized materials. The specimens tested were cantileverbeam-type with dimensions of 10 × 12 × 50 νm3 prepared by focused ion beam machining. Notches with a depth of 3 [m were introduced in all specimens. The entire set of fatigue tests as performed using a newly developed fatigue testing machine in air at room temperature. Fine stripes deduced to be striations were observed on the fatigue fracture surface. Careful measurements of the striation spacings were made. Fatigue crack propagation rate, that is striation spacing, is plotted as a function stress intensity factor range. Fatigue crack propagation rate at stress-ratios of 0.1 and 0.5 in microsized Ni-P amorphous alloy specimens are given by da/dN ∼ 1.3 × 10−8 ΔK;1.16 and da/dN ∼ 3.7 × 10−8 ΔK0.5, respectively. At a given ΔK, crack propagation rate at a stress ratio of 0.5 was higher than that at 0.1. It is considered that a decrease in crack propagation rate at stress ratio of 0.1 is due to adecrease in effective stress intensity factor range ΔKeff, by the effect of crack closure.
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Ichikawa Y, Maekawa S, Takashima K, Shimojo M, Higo Y, Swain MV. Fracture Behavior of Micro-Sized Ni-P Amorphous Alloy Specimens. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-605-273] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractFracture behavior of micro-sized Ni-P Amorphous alloy specimens has been investigated using a newly developed mechanical testing machine. Specimens with dimensions of 10 × 12 × 50 μm were prepared by focused ion beam machining. Two types of specimens with different crack geometries were prepared. One specimen has a notch with root radius is 0.25 μtm and the other has a fatigue pre-crack. The shapes of the loaddisplacement curves are different for each type of specimen. The fracture strength of the specimens with a notch is higher than that with a fatigue pre-crack and the fracture surfaces of the specimens are also different for each type of specimen. This may be due to the difference in stress concentration at the crack (notch) tip, and indicates that even a notch with a root radius of 0.25 μm is not able to be regarded as a crack for micro-sized specimens. Therefore, the introduction of a fatigue pre-crack is essential for the evaluation of fracture toughness for such micro-sized specimens.
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Ideta S, Takashima K, Hashimoto M, Yoshida T, Fujimori A, Anzai H, Fujita T, Nakashima Y, Ino A, Arita M, Namatame H, Taniguchi M, Ono K, Kubota M, Lu DH, Shen ZX, Kojima KM, Uchida S. Enhanced superconducting gaps in the trilayer high-temperature Bi2Sr2Ca2Cu3O(10+δ) cuprate superconductor. Phys Rev Lett 2010; 104:227001. [PMID: 20867198 DOI: 10.1103/physrevlett.104.227001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2009] [Indexed: 05/29/2023]
Abstract
We report the first observation of the multilayer band splitting in the optimally doped trilayer cuprate Bi2Sr2Ca2Cu3O(10+δ) (Bi2223) by angle-resolved photoemission spectroscopy. The observed energy bands and Fermi surfaces are originated from the outer and inner CuO2 planes (OP and IP). The OP band is overdoped with a large d-wave gap around the node of Δ0∼43 meV while the IP is underdoped with an even large gap of Δ0∼60 meV. These energy gaps are much larger than those for the same doping level of the double-layer cuprates, which leads to the large Tc in Bi2223. We propose possible origins of the large superconducting gaps for the OP and IP: (1) minimal influence of out-of-plane disorder and a proximity effect and (2) interlayer tunneling of Cooper pairs between the OP and IP.
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Affiliation(s)
- S Ideta
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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Takashima K, Matsunaga N, Yoshimatsu M, Hazeki K, Kaisho T, Uekata M, Hazeki O, Akira S, Iizawa Y, Ii M. Analysis of binding site for the novel small-molecule TLR4 signal transduction inhibitor TAK-242 and its therapeutic effect on mouse sepsis model. Br J Pharmacol 2009; 157:1250-62. [PMID: 19563534 PMCID: PMC2743844 DOI: 10.1111/j.1476-5381.2009.00297.x] [Citation(s) in RCA: 172] [Impact Index Per Article: 11.5] [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: 11/21/2008] [Revised: 02/17/2009] [Accepted: 03/10/2009] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE TAK-242, a novel synthetic small-molecule, suppresses production of multiple cytokines by inhibiting Toll-like receptor (TLR) 4 signalling. In this study, we investigated the target molecule of TAK-242 and examined its therapeutic effect in a mouse sepsis model. EXPERIMENTAL APPROACH Binding assay with [(3)H]-TAK-242 and nuclear factor-kappaB reporter assay were used to identify the target molecule and binding site of TAK-242. Bacillus calmette guerin (BCG)-primed mouse sepsis model using live Escherichia coli was used to estimate the efficacy of TAK-242 in sepsis. KEY RESULTS TAK-242 strongly bound to TLR4, but binding to TLR2, 3, 5, 9, TLR-related adaptor molecules and MD-2 was either not observed or marginal. Mutational analysis using TLR4 mutants indicated that TAK-242 inhibits TLR4 signalling by binding to Cys747 in the intracellular domain of TLR4. TAK-242 inhibited MyD88-independent pathway as well as MyD88-dependent pathway and its inhibitory effect was largely unaffected by lipopolysaccharide (LPS) concentration and types of TLR4 ligands. TAK-242 had no effect on the LPS-induced conformational change of TLR4-MD-2 and TLR4 homodimerization. In mouse sepsis model, although TAK-242 alone did not affect bacterial counts in blood, if co-administered with ceftazidime it inhibited the increases in serum cytokine levels and improved survival of mice. CONCLUSIONS AND IMPLICATIONS TAK-242 suppressed TLR4 signalling by binding directly to a specific amino acid Cys747 in the intracellular domain of TLR4. When co-administered with antibiotics, TAK-242 showed potent therapeutic effects in an E. coli-induced sepsis model using BCG-primed mice. Thus, TAK-242 may be a promising therapeutic agent for sepsis.
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Affiliation(s)
- K Takashima
- Pharmaceutical Research Division, Pharmacology Research Laboratories I, Takeda Pharmaceutical Company Limited, 2-17-85 Jusohonmachi, Yodogawa-ku, Osaka, Japan
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Tanaka R, Shimizu M, Hoshi K, Soda A, Saida Y, Takashima K, Yamane Y. Efficacy of open patch-grafting under cardiopulmonary bypass for pulmonic stenosis in small dogs. Aust Vet J 2009; 87:88-93. [DOI: 10.1111/j.1751-0813.2009.00389.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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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Yassumoto L, Osajima JA, Takashima K. Efeitos de oxidantes e sais inorgânicos na degradação fotocatalítica do herbicida imazetapir mediada por dióxido de titânio. Eclet Quím 2007. [DOI: 10.1590/s0100-46702007000100004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A degradação fotocatalítica de imazetapir, um herbicida da família das imidazolinonas, em suspensão aquosa de dióxido titânio foi investigada na presença de dois receptores de elétrons como persulfato de potássio e periodato de sódio, assim como na presença de dois sais inorgânicos como sulfato de sódio e dihidrogenofosfato de sódio a 30ºC. O modelo cinético de pseudo-primeira ordem foi empregado para discutir os resultados. O desaparecimento de imazetapir em função do tempo de irradiação foi analisado por cromatografia líquida de alta eficiência. Entre os dois oxidantes estudados a degradação foi mais rápida quando se adicionou o periodato de sódio, enquanto a presença do sulfato de sódio retarda a degradação de imazetapir mais que o dihidrogenofosfato na suspensão de TiO2.
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Takashima K, Higo Y, Nunomura S. Determination of the duration of transient phenomena by frequency-domain analysis of acoustic emission. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418618408234924] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Prieto G, Okumoto M, Takashima K, Katsura S, Mizuno A, Prieto O, Gay C. Nonthermal plasma reactors for the production of light hydrocarbon olefins from heavy oil. Braz J Chem Eng 2003. [DOI: 10.1590/s0104-66322003000100011] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- G. Prieto
- Toyohashi University of Technology Tempaku-cho, Japan
| | - M. Okumoto
- Toyohashi University of Technology Tempaku-cho, Japan
| | - K. Takashima
- Toyohashi University of Technology Tempaku-cho, Japan
| | - S. Katsura
- Toyohashi University of Technology Tempaku-cho, Japan
| | - A. Mizuno
- Toyohashi University of Technology Tempaku-cho, Japan
| | - O. Prieto
- National University of Tucumán, Argentine Republic
| | - C.R. Gay
- National University of Tucumán, Argentine Republic
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Takebe G, Takashima K, Saito Y, Hayashi T, Nagasawa S, Takahashi K. 4P-0966 Reduction of lipid hydroperoxides in oxidized LDL by extracellular glutathione peroxidase and selenoprotein P. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)91224-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Takashima K, Miyake H, Furuta RA, Fujisawa JI, Iizawa Y, Kanzaki N, Shiraishi M, Okonogi K, Baba M. Inhibitory effects of small-molecule CCR5 antagonists on human immunodeficiency virus type 1 envelope-mediated membrane fusion and viral replication. Antimicrob Agents Chemother 2001; 45:3538-43. [PMID: 11709336 PMCID: PMC90865 DOI: 10.1128/aac.45.12.3538-3543.2001] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [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: 11/20/2022] Open
Abstract
We established a human immunodeficiency virus type 1 (HIV-1) envelope (Env)-mediated membrane fusion assay and examined the small-molecule CCR5 antagonist TAK-779 and its derivatives for their inhibitory effects on HIV-1 Env-mediated membrane fusion and viral replication. The membrane fusion assay is based on HIV-1 long terminal repeat-directed beta-D-galactosidase reporter gene expression in CD4- and CCR5-expressed HeLa (MAGI-CCR5) cells after cocultivation with effector 293T cells expressing HIV-1 Env. Inhibition of HIV-1 replication was also determined in MAGI-CCR5 cells infected with the corresponding cell-free HIV-1. TAK-779 effectively suppressed R5 HIV-1 (strain JR-FL) Env-mediated membrane fusion as well as viral replication. Its 50% inhibitory concentrations (IC(50)s) for membrane fusion and viral replication were 0.87 +/- 0.11 and 1.4 +/- 0.1 nM, respectively. These values corresponded well to the IC(50) for (125)I-RANTES (regulated on activation, T cell expressed, and secreted) binding to CCR5 (1.4 nM). The inhibitory effects of 18 TAK-779 derivatives on membrane fusion differed from one compound to another. However, there was a close correlation among their inhibitory effects on membrane fusion, viral replication, and RANTES binding. The correlation coefficient between their IC(50)s for membrane fusion and viral replication was 0.881. Furthermore, since this assay depends on Env expressed in the effector cells, it is also applicable to the evaluation of CXCR4 antagonists. These results indicate that the HIV-1 Env-mediated membrane fusion assay is a useful tool for the evaluation of entry inhibitors.
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Affiliation(s)
- K Takashima
- Division of Human Retroviruses, Center for Chronic Viral Diseases, Faculty of Medicine, Kagoshima University, Kagoshima 890-8520, Japan
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Ozono S, Hinotsu S, Tabata S, Takashima K, Fujimoto K, Okajima E, Hirao Y, Ohashi Y, Akaza H, Fukushima S. Treated natural history of superficial bladder cancer. Jpn J Clin Oncol 2001; 31:536-40. [PMID: 11773261 DOI: 10.1093/jjco/hye114] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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: 11/14/2022] Open
Abstract
BACKGROUND The present study was conducted to examine the natural history of superficial bladder cancer. METHODS One hundred and forty-four patients with superficial bladder cancer who had been treated with transurethral resection of bladder tumor (TURBt) alone were analyzed. RESULTS The non-recurrence rate was 64.8% at 36 months and 61.2% at 60 months after TURBt. When the non-recurrence rate after TURBt was analyzed by background variables, the rate differed significantly between the solitary tumor group and the multiple tumor group. The tumor recurrence hazard curves for the entire population had one high peak before 500 days and another slight peak around 1500 days after TURBt. CONCLUSIONS These results will provide basic information useful when evaluating new regimens of intravesical instillation therapy for prophylaxis of superficial bladder cancer after our complete TURBt in the Nara Uro-Oncology Research Group.
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Affiliation(s)
- S Ozono
- Department of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522, Japan.
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Takashima K, Ozono S, Nakanou I, Ota M, Tanaka M, Tani M, Hirao K, Hirao Y, Kuwashima S, Hiasa Y. Strain variation in renal carcinogenesis by N-ethyl-N-hydroxyethylnitrosamine in F1 (Wistar-Fischer) rats. Cancer Lett 2001; 170:125-30. [PMID: 11463489 DOI: 10.1016/s0304-3835(01)00608-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The present study was conducted to compare the incidences of renal tumors in Wistar (W), Fischer (F) and F1 rats (WF: female Wistar rats x male Fischer rats; FW: female Fischer rats x male Wistar rats) induced by N-ethyl-N-hydroxyethylnitrosamine (EHEN). Levels of 8-OHdG in renal DNA were also investigated in Wistar and Fischer rats. After 2000 ppm of EHEN was administered orally for 2 weeks, the animals were fed basal diet until week 32. Wistar males and females demonstrated significantly higher sensitivity regarding induction of renal lesions, while both WF and FW rats had similar incidences, generally intermediate between those for the two parent strains. The formation of 8-OHdG was maximal 60-180 min after an intraperitoneal dose of 750 mg/kg to Wistar and Fischer rats, which correlates with the increase tending to the incidence of renal tumors in male and female Wistar and Fischer rats. The results suggest that EHEN induction of renal tumors is related to oxygen radical damage and that the genes in the Wistar strain responsible for the sensitivity are not inherited in a sex-dependent fashion, despite the male being more susceptible.
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Affiliation(s)
- K Takashima
- Department of Urology, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, Japan
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Matsumoto H, Sugiyama S, Shibazaki A, Tanaka R, Takashima K, Noishiki Y, Yamane Y. Experimental study of materials for patch graft on right ventricular outflow tract under extracorporeal circulation in dogs--comparison between Denacol EX-313-treated bovine jugular vein graft and expanded polytetrafluoroethylene (EPTFE) graft. J Vet Med Sci 2001; 63:961-5. [PMID: 11642283 DOI: 10.1292/jvms.63.961] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/22/2022] Open
Abstract
A comparison between a bovine jugular vein treated with a hydrophilic polyepoxy compound cross-linker (Denacol), and expanded polytetrafluoroethylene (EPTFE), an artificial material, as a patch graft for the reconstruction of the right ventricular outflow tract under extracorporeal circulation in dogs, as if they had pulmonic stenosis, was made. Hemodynamic and histological examinations were conducted two weeks after the transplantation. Hemodynamic problems were not observed in either the Denacol or EPTFE groups. Macroscopically, organization of new tissue on the graft surface was more marked in the EPTFE group than in the Denacol group, and newly-formed tissue was seen surrounding the border of the graft and burying it in the EPTFE group. In the Denacol group, microscopic findings revealed the presence of inflammatory cells and fibroblasts, and an invasion of the graft by collagen fibers and elastic fibers. In the EPTFE group, there was minimal cellular infiltration of the graft and a thick layer consisting of collagen fibers and fibroblasts was observed around the graft. These results indicated that two weeks after transplantation the graft was better assimilated and organized with blood vasculature in the patch graft in the Denacol group than in the EPTFE group.
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Affiliation(s)
- H Matsumoto
- Animal Clinical Research Foundation, Kurayoshi-shi, Tottori, Japan
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Matsuura S, Komatsu J, Hirano K, Yasuda H, Takashima K, Katsura S, Mizuno A. Real-time observation of a single DNA digestion by lambda exonuclease under a fluorescence microscope field. Nucleic Acids Res 2001; 29:E79. [PMID: 11504887 PMCID: PMC55863 DOI: 10.1093/nar/29.16.e79] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [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: 11/12/2022] Open
Abstract
A fluorescence microscopy technique has been developed to visualize the behavior of individual DNA and protein molecules. Real-time direct observation of a single DNA molecule can be used to investigate the dynamics of DNA-protein interactions, such as the DNA digestion reaction by lambda exonuclease. In conventional methods it is impossible to analyze the dynamics of an individual lambda exonuclease molecule on a DNA because they can only observe the average behavior of a number of exonuclease molecules. Observation of a single molecule, on the other hand, can reveal processivity and binding rate of an individual exonuclease molecule. To evaluate the dynamics of lambda exonuclease, a stained lambda DNA molecule with one biotinylated terminal was fixed on an avidin-coated coverslip and straightened using a d.c. electric field. Microscopic observation of digestion of a straightened DNA molecule by lambda exonuclease revealed that the DNA digestion rate was approximately 1000 bases/s and also demonstrated high processivity.
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Affiliation(s)
- S Matsuura
- Department of Ecological Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
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40
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Kimura S, Kawasaki S, Takashima K, Sasaki K. Physiological and pharmacological characteristics of quisqualic acid-induced K(+)-current response in the ganglion cells of Aplysia. Jpn J Physiol 2001; 51:511-21. [PMID: 11564288 DOI: 10.2170/jjphysiol.51.511] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The extracellular application of either quisqualic acid (QA) or Phe-Met-Arg-Phe-NH2 (FMRFamide) induces an outward current in identified neurons of Aplysia ganglion under voltage clamp. The time course of the QA-induced response is significantly slower than that induced by FMRFamide. The reversal potential for both responses was -92 mV and was shifted 17 mV in a positive direction for a twofold increase in the extracellular K(+) concentration. The QA-induced response was markedly depressed in the presence of Ba(2+), a blocker of inward rectifier K(+)-channel, whereas TEA, a Ca(2+)-activated K(+)-channel (BK(Ca)) blocker, or 4-AP, a transient K(+) (A)-channel blocker, had no effect on the response. The QA-induced K(+)-current was significantly suppressed by CNQX and GYKI52466, antagonists of non-NMDA receptors. However, the application of either kainate or AMPA, agonists for non-NMDA receptors, produced no type of response in the same neurons. The QA-induced K(+)-current response was not depressed at all by an intracellular injection of either guanosine 5'-O-(2-thiodiphosphate) (GDP-betaS) or guanosine 5'-O-(3-thiotriphosphate) (GTP-gammaS), but the FMRFamide-induced response was markedly blocked by both GDP-betaS and GTP-gammaS in the same cell. Furthermore, the QA- and FMRFamide-induced K(+)-current responses were both decreased markedly when the temperature was lowered to 15 degrees C, from 23 degrees C. These results suggested that the QA-induced K(+)-current response is produced by an activation of a novel type of QA-receptor and that this response is not produced by an activation of the G protein.
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Affiliation(s)
- S Kimura
- Department of Physiology and Advanced Medical Science Research Center, School of Medicine, Iwate Medical University, Morioka, 020-8505, Japan.
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Fujita R, Kimura S, Kawasaki S, Takashima K, Matsumoto M, Hirano H, Sasaki K. ATP suppresses the K(+) current responses to FSH and adenosine in the follicular cells of Xenopus oocyte. Jpn J Physiol 2001; 51:491-500. [PMID: 11564286 DOI: 10.2170/jjphysiol.51.491] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The application of either follicle-stimulating hormone (FSH) or adenosine (Ade) induces a K(+)-current response in the follicular cells surrounding a Xenopus oocyte under a voltage clamp. These K(+)-current responses are reported to be produced by an increase in intracellular cAMP. A previous application of ATP to the same cells markedly depressed the K(+)-current responses to FSH and Ade. Furthermore, a 2 min application of phorbol 12,13-dibutyrate (PDBu), an activator of protein kinase C (PKC), significantly depressed the K(+)-current responses to FSH and Ade, but it had no significant effect on the Cl(-)-current response to ATP. An application of either ATP or PDBu also depressed the K(+)-current response induced by intracellularly applied cAMP. In contrast to the effect of PDBu, the application of 1-octanol, an inhibitor of gap junction channel, significantly depressed both the Ade- and ATP-induced responses, indicating that the acting site of 1-octanol is different from that of PKC. The results suggest that the depressing effect of ATP on the FSH- and Ade-induced K(+)-current responses might be mediated by PKC activation and that the site of PKC action might be downstream of the cAMP production involved in the K(+) channel opening.
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Affiliation(s)
- R Fujita
- Department of Chemistry, School of Liberal Arts and Sciences, Iwate Medical University, Morioka, 020-0015, Japan.
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Aoki K, Nakanou I, Takashima K, Hirao K, Hiramatsu T, Fujimoto K, Kagebayashi Y, Ozono S, Hirao Y. [A case of renal cell carcinoma producing alpha-fetoprotein]. Hinyokika Kiyo 2001; 47:477-80. [PMID: 11523131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Renal cell carcinoma (RCC) producing alpha-fetoprotein (AFP) is a rare condition with only 11 cases reported in Japan to our knowledge. A 69-year-old man was admitted to our hospital for further examination of an incidental right renal tumor. Laboratory tests showed markedly increased serum level of AFP whereas both HBs antigen and anti-HCV antibody were negative. Computed tomography and magnetic resonance imaging imagings showed a right renal tumor but no tumor in liver, testis or lymph node. We performed right radical nephrectomy. Serum level of AFP declined within the normal range 7 weeks after nephrectomy according to its half-life curve. The tumor specimen was composed mainly of granular cells. Immunohistochemical examination of the tumor cells proved the presence of AFP in the cytoplasm. The possibility of AFP as a tumor marker of renal cell carcinoma in this case was presented.
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Affiliation(s)
- K Aoki
- Department of Urology, Hirao Hospital
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Fujii Y, Masuda Y, Takashima K, Ogasawara J, Machida N, Yamane Y, Chimura S, Awazu T, Yamane T, Wakao Y. Hypertrophic cardiomyopathy in two kittens. J Vet Med Sci 2001; 63:583-5. [PMID: 11411510 DOI: 10.1292/jvms.63.583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Two 2-month-old kittens presented with a loud cardiac murmur. One cat showed severe signs of heart failure such as respiratory effort and exercise intolerance. Echocardiography revealed left ventricular concentric hypertrophy and severe left ventricular outflow obstruction. They died at 5 and 12 months of age, respectively. Necropsy and histopathology confirmed hypertrophic cardiomyopathy.
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Affiliation(s)
- Y Fujii
- Department of Surgery 1, School of Veterinary Medicine, Azabu University, Kanagawa, Japan
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Horie S, Maeta H, Endo K, Ueta T, Takashima K, Terada T. Overexpression of p53 protein and MDM2 in papillary carcinomas of the thyroid: Correlations with clinicopathologic features. Pathol Int 2001; 51:11-5. [PMID: 11148457 DOI: 10.1046/j.1440-1827.2001.01159.x] [Citation(s) in RCA: 22] [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: 01/10/2023]
Abstract
Expression of p53 protein and MDM2 was evaluated in paraffin-embedded tissue from 78 patients with papillary carcinomas of the thyroid (PCT), in order to elucidate the relationship between them and their correlations with some clinicopathologic features implicated in tumor progression. These proteins were expressed in nuclei of tumor cells, but not in non-tumor cells. Staining was defined as positive when 10% or more of tumor cells expressed these proteins. The number of cases positive for p53 protein was 21/78 (27%), and that positive for MDM2 was 26/78 (33%). Co-overexpression of p53 protein and MDM2 was observed in 12/78 cases (15%). A significant positive relationship was found between them (P < 0.01); p53-positive cases tended to be also positive for MDM2 and vice versa. Statistical analysis revealed that overexpression of p53 protein significantly correlated with large tumor size (P = 0.0271) and the presence of capsular invasion (P = 0.04). There were significant positive correlations between tumor size and intrathyroidal invasion and between tumor size and capsular invasion in PCT, suggesting that p53 protein overexpression is associated only with tumor progression (tumor size). However, we could not find any significant correlations between MDM2 expression and clinicopathologic features. Our findings suggest that overexpression of p53 protein and MDM2 in papillary carcinoma of the thyroid is associated with the progression of the tumors, and that p53 may be a marker of the progression of PCT.
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Affiliation(s)
- S Horie
- Second Department of Pathology, Tottori University, Faculty of Medicine, 86 Nishi-cho, Yonago 683-8503, Tottori, Japan
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Nakayama K, Takashima K, Ishihara H, Shinomiya T, Kageyama M, Kanaya S, Ohnishi M, Murata T, Mori H, Hayashi T. The R-type pyocin of Pseudomonas aeruginosa is related to P2 phage, and the F-type is related to lambda phage. Mol Microbiol 2000; 38:213-31. [PMID: 11069649 DOI: 10.1046/j.1365-2958.2000.02135.x] [Citation(s) in RCA: 235] [Impact Index Per Article: 9.8] [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: 11/20/2022]
Abstract
Pseudomonas aeruginosa produces three types of bacteriocins: R-, F- and S-type pyocins. The S-type pyocin is a colicin-like protein, whereas the R-type pyocin resembles a contractile but non-flexible tail structure of bacteriophage, and the F-type a flexible but non-contractile one. As genetically related phages exist for each type, these pyocins have been thought to be variations of defective phage. In the present study, the nucleotide sequence of R2 pyocin genes, along with those for F2 pyocin, which are located downstream of the R2 gene cluster on the chromosome of P. aeruginosa PAO1, was analysed in order to elucidate the relationship between the pyocins and bacteriophages. The results clearly demonstrated that the R-type pyocin is derived from a common ancestral origin with P2 phage and the F-type from lambda phage. This notion was supported by identification of a lysis gene cassette similar to those for bacteriophages. The gene organization of the R2 and F2 pyocin gene cluster, however, suggested that both pyocins are not simple defective phages, but are phage tails that have been evolutionarily specialized as bacteriocins. A systematic polymerase chain reaction (PCR) analysis of P. aeruginosa strains that produce various subtypes of R and F pyocins revealed that the genes for every subtype are located between trpE and trpG in the same or very similar gene organization as for R2 and F2 pyocins, but with alterations in genes that determine the receptor specificity.
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Affiliation(s)
- K Nakayama
- Department of Bacteriology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
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46
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Tani M, Ozono S, Takashima K, Tanaka M, Ota M, Nagayoshi J, Yoshikawa M, Hirao Y, Okajima E. [The problem of a long-term follow up in patients with renal cell carcinoma]. Nihon Hinyokika Gakkai Zasshi 2000; 91:469-72. [PMID: 10826245 DOI: 10.5980/jpnjurol1989.91.469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
PURPOSE We investigated on a problem of long-term follow up in patients with renal cell carcinoma. PATIENTS AND METHODS A total of 287 patients with renal cell carcinoma treated in Nara Medical University and affiliated facilities from January 1980 to December 1990 were examined. And we investigated the trend of explanation to patients including 287 patients from 1991 to 1995. RESULTS Up to December 1995, there are 76 patients (26.5%) unable to be followed and 211 patients able to be followed. The former group patients were less declared cancer rather than the latter group patients. Of 76, 22 patients (28.9%) might misunderstand completely recovering from the cancer disease. For the recent 5 years, those patients who were declared cancer increased, and those patients who were explained benign disease decreased. CONCLUSION These results suggested that declaration of cancer is important for patients with renal cell carcinoma to be followed for a long-term.
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Affiliation(s)
- M Tani
- Department of Urology, Nara Medical University, Japan
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47
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Oide H, Minegishi A, Kobayashi S, Suzuki S, Takashima K. [Evaluation of p21 and lung resistance protein (LRP) as a factor suggesting breast cancer recurrence]. Nihon Geka Gakkai Zasshi 2000; 101:242. [PMID: 10809609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Oguchi Y, Matsumoto H, Masuda Y, Takashima H, Takashima K, Yamane Y. Balloon dilation of right ventricular outflow tract in a dog with tetralogy of Fallot. J Vet Med Sci 1999; 61:1067-9. [PMID: 10535516 DOI: 10.1292/jvms.61.1067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Balloon dilation was performed on a dog with tetralogy of Fallot. Immediately following balloon dilation, the peak systolic pressure gradient across the pulmonic valve declined from 97 to 63 mmHg. Doppler echocardiography following balloon dilation revealed increased pulmonary blood flow. Clinical symptoms obviously improved and the dog's improved condition was maintained for 4 months. There were no serious complications in performing the procedure. It was concluded that balloon dilation was a safe and effective treatment for a dog case with tetralogy of Fallot. Long-term follow-up studies will be required to identify the exact indications of balloon dilation for tetralogy of Fallot.
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Affiliation(s)
- Y Oguchi
- Tottori Animal Clinical Research Foundation, and Tokyo University of Agriculture and Technology, Japan
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49
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Ozono S, Kim SC, Takashima K, Tani Y, Okajima E, Hirao Y, Maruyama Y, Iwai A, Samma S, Momose H. [Intra-arterial chemotherapy for invasive bladder cancer]. Hinyokika Kiyo 1999; 45:133-7. [PMID: 10212788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
The present investigation was conducted to examine the effects of intra-arterial chemotherapy (IAC) for patients with invasive bladder cancer. A total of 37 patients were treated with IAC at Nara Medical University and its affiliated hospitals between January, 1993 and August, 1997. There were 27 patients in the poor risk group. The remaining 10 patients underwent anti-tumor IAC. Thirty of the 37 patients received chemotherapeutic agents via a reservoir, and the remaining 7 patients received a one-shot injection of agents followed by transcatheter arterial embolization (TAE). In the reservoir group, there were 18 patients who received IAC in combination with radiation therapy. As a result, reduction of tumor size was noted in 53%, and the 3-year cause-specific survival rate was 54% in all cases. There was a significant difference in the 3-year survival rate between the radiation-treated group and the group without radiation. The adverse events included anemia, leukopenia, thrombocytopenia and gastrointestinal symptoms, but none of them were severe. The results of the present study indicate that IAC is useful in the treatment of invasive bladder cancer for poor risk patients.
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Affiliation(s)
- S Ozono
- Department of Urology, Nara Medical University
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Kawai J, Takahashi M, Kato N, Takashima K, Miyazawa T. Comparison of a 1.0 molar and a 0.5 molar formulation of gadobutrol in dynamic MR imaging of the liver in rats with hepatocellular carcinoma. Magn Reson Imaging 1999; 17:91-7. [PMID: 9888402 DOI: 10.1016/s0730-725x(98)00144-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The efficacy of a 1.0 molar formulation of gadobutrol was compared with that of a 0.5 molar formulation in dynamic magnetic resonance (MR) imaging of the liver in rats with hepatocellular carcinoma (HCC). Seven nodules histologically identified as moderately differentiated HCC underwent dynamic study. In the normal parenchyma surrounding these tumors, the 0.5 molar and 1.0 molar formulations yielded similar enhancement patterns, with maximum enhancement value of approximately 35% at 20 to 40 s after injection. In the tumors, the 0.5 molar formulation induced approximately 65% enhancement, whereas the 1.0 molar formulation, used at the same dose as the 0.5 molar formulation, induced significantly higher enhancement until 10 min after injection with maximum enhancement of approximately 90%. These findings indicate that the 1.0 molar formulation could be more efficacious than the 0.5 molar formulation in dynamic MR studies of moderately differentiated HCC even when injected at the same dose.
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Affiliation(s)
- J Kawai
- Diagnostics Research Team, Basic Research Institute, Nihon Schering K.K., Osaka, Japan
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