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Nozaki H, Tange Y, Inada Y, Uchino T, Azuma N. Leakage of Endotoxins through the Endotoxin Retentive Filter: An in vitro Study. Blood Purif 2022; 51:831-839. [PMID: 35021168 DOI: 10.1159/000520792] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 11/06/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Ultrapurification of dialysis fluid has enabled highly efficient dialysis treatments. Online hemodiafiltration is one such treatment that uses a purified dialysis fluid as a supplemental fluid. In this method, an endotoxin retentive filter (ETRF) is used in the final step of dialysis fluid purification, with the aim of preventing leakage of endotoxins. Sodium hypochlorite and peracetic acid are used as disinfecting agents for the dialysis fluid pipes containing the ETRF; however, the effects of these agents on ETRF membrane pores have not been fully clarified. METHODS Water permeability (flux) and endotoxin permeability were assessed in 3 types of ETRFs made with different membrane materials: polyester polymer alloy (PEPA), polyether sulfone (PES), and polysulfone (PS). High-concentration sodium hypochlorite and 2 types of peracetic acid were used as disinfecting agents, and the changes in flux and the endotoxin sieving coefficient (SC) were measured. RESULTS After repeated use of high concentrations of sodium hypochlorite and peracetic acid, the PEPA and PES ETRFs did not permit passage of endotoxins, regardless of their flux. However, in the PS ETRF, the flux and endotoxin SC increased with the number of cleaning cycles. No differences were observed according to the concentration of peracetic acid disinfecting agents. CONCLUSION PEPA and PES ETRFs completely prevent endotoxin leakage and can be disinfected at concentrations higher than the conventionally recommended concentration without affecting pore expansion. Even new PS ETRFs have low levels of endotoxin leakage, which increase after disinfection cycles using sodium hypochlorite and peracetic acid.
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Affiliation(s)
- Hiroshi Nozaki
- Tokatsu-Clinic Hospital, Matsudo, Japan.,Graduate School of Health Sciences, Kyushu University of Health and Welfare, Nobeoka, Japan
| | - Yoshihiro Tange
- Graduate School of Health Sciences, Kyushu University of Health and Welfare, Nobeoka, Japan
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2
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Kanemura Y, Kanazawa M, Hashimoto S, Hayashi Y, Fujiwara E, Suzuki A, Ishii T, Goto M, Nozaki H, Inoue T, Takanari H. Assessment of skin inflammation using near-infrared Raman spectroscopy combined with artificial intelligence analysis in an animal model. Analyst 2022; 147:2843-2850. [DOI: 10.1039/d2an00193d] [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: 11/21/2022]
Abstract
Near-infrared (NIR) Raman spectroscopy was applied to detect skin inflammation in an animal model. Artificial intelligence (AI) analysis improved prediction accuracy for skin inflammation.
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Affiliation(s)
- Yohei Kanemura
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, 3-18-15, Kuramoto, Tokushima 770-8503, Japan
- Tokushima University, Faculty of Science and Technology, 2-1, Minami-Josanjima, Tokushima 770-8506, Japan
| | - Meiko Kanazawa
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, 3-18-15, Kuramoto, Tokushima 770-8503, Japan
- Tokushima University, Faculty of Medicine, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Satoru Hashimoto
- Division of Applied Chemistry, Faculty of Science and Technology, Oita University Graduate School of Engineering, 700, Dan-noharu, Oita 870-1124, Japan
| | - Yuri Hayashi
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, 3-18-15, Kuramoto, Tokushima 770-8503, Japan
- Tokushima University, Faculty of Medicine, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Erina Fujiwara
- Division of Applied Chemistry, Faculty of Science and Technology, Oita University Graduate School of Engineering, 700, Dan-noharu, Oita 870-1124, Japan
| | - Ayako Suzuki
- Division of Applied Chemistry, Faculty of Science and Technology, Oita University Graduate School of Engineering, 700, Dan-noharu, Oita 870-1124, Japan
| | - Takashige Ishii
- Division of DX Promotion, OEC Co., Ltd., 17-57, Higashi-Kasuga, Oita 870-0037, Japan
| | - Masakazu Goto
- Division of DX Promotion, OEC Co., Ltd., 17-57, Higashi-Kasuga, Oita 870-0037, Japan
| | - Hiroshi Nozaki
- Division of DX Promotion, OEC Co., Ltd., 17-57, Higashi-Kasuga, Oita 870-0037, Japan
| | - Takanori Inoue
- Division of Applied Chemistry, Faculty of Science and Technology, Oita University Graduate School of Engineering, 700, Dan-noharu, Oita 870-1124, Japan
| | - Hiroki Takanari
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, 3-18-15, Kuramoto, Tokushima 770-8503, Japan
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3
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Shiga T, Masuoka Y, Nozaki H. Observation of lithium stripping in super-concentrated electrolyte at potentials lower than regular Li stripping. RSC Adv 2021; 11:13359-13365. [PMID: 35423877 PMCID: PMC8697623 DOI: 10.1039/d1ra01490k] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 03/28/2021] [Indexed: 11/21/2022] Open
Abstract
Lithium plating/stripping was investigated under constant current mode using a copper powder electrode in a super-concentrated electrolyte of lithium bis(fluorosulfonyl)amide (LiFSA) with methylphenylamino-di(trifluoroethyl) phosphate (PNMePh) and vinylene carbonate (VC) as additives. Typical Li plating/stripping for Cu electrodes in organic electrolytes of conventional lithium batteries proceeds at potentials of several millivolts versus a Li counter electrode. In contrast, a large overpotential of hundreds of millivolts was observed for Li plating/stripping with the super-concentrated electrolyte. When Li stripping started immediately after Li plating and with no rest time between plating and stripping, two potential plateaus, i.e., two-step Li stripping, was observed. The potential plateau for the 1st stripping step appeared at -0.2 V versus a Li metal counter electrode. The electrical capacity for the 1st stripping step was 0.04 mA h cm-2, which indicates irregular Li stripping. Two-step Li stripping was also recorded using cyclic voltammetry. The electrochemical impedance spectroscopy (EIS) studies indicated that the two-step Li stripping behaviour reflected two different solid electrolyte interphases (SEIs) on electrodeposited Li in a Cu electrode. The SEI for the 1st-step stripping was in a transition period of the SEI formation. The open circuit voltage (OCV) relaxation with an order of tens of hours was detected after Li plating and before Li stripping. The in operando EIS study suggested a decrease of the charge transfer resistance in the Cu powder electrode during the OCV relaxation. Since the capacitance for the voltage relaxation was a dozen microfarads, it had a slight contribution to the 1st-step Li stripping behaviour. The voltage relaxation indicated the possibility that it is difficult for Li ions to be electrodeposited or that the Li plating is in a quasi-stable state.
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Affiliation(s)
- Tohru Shiga
- Toyota Central Research & Development Laboratories Inc. Yokomichi Nagakute-city Aichi-ken 480-1192 Japan
| | - Yumi Masuoka
- Toyota Central Research & Development Laboratories Inc. Yokomichi Nagakute-city Aichi-ken 480-1192 Japan
| | - Hiroshi Nozaki
- Toyota Central Research & Development Laboratories Inc. Yokomichi Nagakute-city Aichi-ken 480-1192 Japan
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4
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Ogihara N, Hasegawa M, Kumagai H, Nozaki H. Low-Resistance Mechanism of Nanoflake Crystalline Aromatic Dicarboxylates with Selective Defects for Safe and Fast Charging Negative Electrodes. ACS Nano 2021; 15:2719-2729. [PMID: 33525874 DOI: 10.1021/acsnano.0c08290] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Low resistance of Li-intercalated negative electrodes is important for the safe and fast charging required for large-scale batteries. Here, we demonstrated that nanosized two-dimensional crystalline aromatic dicarboxylate negative electrode materials synthesized via spray drying exhibit low internal resistances at approximately 0.7 V vs Li/Li+, while retaining flat potential profiles. The spray-dried sample with a hollow structure is crushed into nanoflakes during ink preparation for electrode coating and forms a uniform and highly dispersed electrode structure. The charge-discharge evaluation indicates that the nanoflake sample showed smaller charge-discharge polarization than the bulk sample with stable cycling characteristics, resulting in significant high-rate property enhancement. Charge-transfer resistance of the nanoflake sample exhibits the lowest value (ca. 2.2 Ω cm2) among those reported for existing intercalation electrodes (5.2 to 235 Ω cm2). In comparison of the negative electrodes, the estimated maximum current density without Li deposition (ca. 316 mA cm-2) is more than 1 order of magnitude higher than that for currently used graphite (ca. 11 mA cm-2) and is also higher than those for high-rate oxides (137-298 mA cm-2). The resistance-crystal correlation using multiple regression analysis predictions and its verification reveal that this low resistance is owing to an improved Li acceptability associated with selective structural defects induced by the loss of incorporated crystallized water during drying. The crystal plane exposed by the selective structural defects is perpendicular to electronic and ionic conduction directions inside the solid, resulting in improved kinetics. Therefore, the proposed negative electrode allows safe and fast charging, with easy scale-up and sustainable resources.
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Affiliation(s)
- Nobuhiro Ogihara
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Masaki Hasegawa
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Hitoshi Kumagai
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Hiroshi Nozaki
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
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5
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Shiga T, Masuoka Y, Nozaki H, Ohba N. Lithium-ion attack on yttrium oxide in the presence of copper powder during Li plating in a super-concentrated electrolyte. RSC Adv 2021; 11:6361-6366. [PMID: 35423138 PMCID: PMC8694813 DOI: 10.1039/d0ra10388h] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/20/2021] [Indexed: 12/02/2022] Open
Abstract
Li plating/stripping on Cu and Y2O3 (Cu + Y2O3) electrodes was examined in a super-concentrated electrolyte of lithium bis(fluorosulfonyl)amide and methylphenylamino-di(trifluoroethyl) phosphate. In principle, Li+ ions cannot intercalate into a Y2O3 crystal because its intercalation potential obtained from first-principles calculations is −1.02 V vs. Li+/Li. However, a drastic decrease in the electrode potential and a subsequent constant-potential region were observed during Li plating onto a Cu + Y2O3 electrode, suggesting that Li+ interacted with Y2O3. X-ray diffraction (XRD) patterns and X-ray absorption fine structure (XAFS) spectra of the Cu + Y2O3 electrodes after the Li plating were recorded to verify this phenomenon. The XRD and XAFS results indicated that the crystallinity of Y2O3 crystals was lowered because of attack by Li+ ions or that the Y2O3 crystal structure was broken while the +3 valence state of Y was maintained. When Li plating was conducted on a Cu + Y2O3 composite electrode in a super-concentrated electrolyte, a potential drop and subsequent potential plateau were observed, where Li plating occurs and Li+ attacks the Y2O3 crystals.![]()
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Affiliation(s)
- Tohru Shiga
- Toyota Central Research & Development Laboratories Inc
- Nagakute-city
- Japan
| | - Yumi Masuoka
- Toyota Central Research & Development Laboratories Inc
- Nagakute-city
- Japan
| | - Hiroshi Nozaki
- Toyota Central Research & Development Laboratories Inc
- Nagakute-city
- Japan
| | - Nobuko Ohba
- Toyota Central Research & Development Laboratories Inc
- Nagakute-city
- Japan
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Sugiyama J, Umegaki I, Nozaki H, Higemoto W, Hamada K, Takeshita S, Koda A, Shimomura K, Ninomiya K, Kubo MK. Nuclear Magnetic Field in Solids Detected with Negative-Muon Spin Rotation and Relaxation. Phys Rev Lett 2018; 121:087202. [PMID: 30192624 DOI: 10.1103/physrevlett.121.087202] [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] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/08/2018] [Indexed: 06/08/2023]
Abstract
Using an intense negative muon (μ^{-}) source, we have studied the internal magnetic fields in a powder sample of magnesium hydride (MgH_{2}). By extracting the signal from the μ^{-} captured on Mg nuclei, we found that the negative muon spin rotation and relaxation (μ^{-}SR) spectra clearly showed a Kubo-Toyabe-type relaxation, which indicates a random magnetic field at the Mg site. The field distribution width obtained is very consistent with the predicted value at the Mg site estimated by dipole field calculations, supporting our claim to have observed the nuclear magnetic fields of hydrogens in MgH_{2}. As is the case with μ^{+}SR, μ^{-}SR promises to soon be an indispensable tool for materials analyses.
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Affiliation(s)
- Jun Sugiyama
- Toyota Central Research & Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Izumi Umegaki
- Toyota Central Research & Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Hiroshi Nozaki
- Toyota Central Research & Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan
| | - Wataru Higemoto
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - Koji Hamada
- High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Soshi Takeshita
- High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Akihiro Koda
- High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Koichiro Shimomura
- High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan
| | - Kazuhiko Ninomiya
- Department of Chemistry, Graduate School of Science, Osaka University, Machikane, Osaka 560-0054, Japan
| | - M Kenya Kubo
- Department of Natural Sciences, College of Liberal Arts, International Christian University, Mitaka, Tokyo 181-8585, Japan
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7
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Konno T, Yoshida K, Mizuta I, Mizuno T, Kawarai T, Tada M, Nozaki H, Ikeda SI, Onodera O, Wszolek ZK, Ikeuchi T. Diagnostic criteria for adult-onset leukoencephalopathy with axonal spheroids and pigmented glia due to CSF1R mutation. Eur J Neurol 2017; 25:142-147. [PMID: 28921817 DOI: 10.1111/ene.13464] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [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: 05/15/2017] [Accepted: 09/07/2017] [Indexed: 02/02/2023]
Abstract
BACKGROUND AND PURPOSE To establish and validate diagnostic criteria for adult-onset leukoencephalopathy with axonal spheroids and pigmented glia (ALSP) due to colony-stimulating factor 1 receptor (CSF1R) mutation. METHODS We developed diagnostic criteria for ALSP based on a recent analysis of the clinical characteristics of ALSP. These criteria provide 'probable' and 'possible' designations for patients who do not have a genetic diagnosis. To verify its sensitivity and specificity, we retrospectively applied our criteria to 83 ALSP cases who had CSF1R mutations (24 of these were analyzed at our institutions and the others were identified from the literature), 53 cases who had CSF1R mutation-negative leukoencephalopathies and 32 cases who had cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) with NOTCH3 mutations. RESULTS Among the CSF1R mutation-positive cases, 50 cases (60%) were diagnosed as 'probable' and 32 (39%) were diagnosed as 'possible,' leading to a sensitivity of 99% if calculated as a ratio of the combined number of cases who fulfilled 'probable' or 'possible' to the total number of cases. With regard to specificity, 22 cases (42%) with mutation-negative leukoencephalopathies and 28 (88%) with CADASIL were correctly excluded using these criteria. CONCLUSIONS These diagnostic criteria are very sensitive for diagnosing ALSP with sufficient specificity for differentiation from CADASIL and moderate specificity for other leukoencephalopathies. Our results suggest that these criteria are useful for the clinical diagnosis of ALSP.
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Affiliation(s)
- T Konno
- Department of Neurology, Mayo Clinic, Jacksonville, FL, USA.,Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - K Yoshida
- Department of Brain Disease Research, Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - I Mizuta
- Department of Neurology, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto, Japan
| | - T Mizuno
- Department of Neurology, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto, Japan
| | - T Kawarai
- Department of Clinical Neuroscience, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - M Tada
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - H Nozaki
- Department of Medical Technology, School of Health Sciences Faculty of Medicine, Niigata University, Niigata, Japan
| | - S-I Ikeda
- Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Matsumoto, Nagano, Japan
| | - O Onodera
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Z K Wszolek
- Department of Neurology, Mayo Clinic, Jacksonville, FL, USA
| | - T Ikeuchi
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata, Japan
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8
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Mezaki N, Miura T, Ogaki K, Eriguchi M, Mizuno Y, Komatsu K, Yamazaki H, Ono N, Kawajiri S, Yamasaki R, Nozaki H, Kasuga K, Okuma Y, Kira J, Hara H, Onodera O, Ikeuchi T. LMNB1-related adult-onset autosomal dominant leukodystrophy: Genetic and clinical studies of four Japanese families. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Grochau-Wright ZI, Hanschen ER, Ferris PJ, Hamaji T, Nozaki H, Olson BJSC, Michod RE. Genetic basis for soma is present in undifferentiated volvocine green algae. J Evol Biol 2017; 30:1205-1218. [PMID: 28425150 PMCID: PMC5540444 DOI: 10.1111/jeb.13100] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Revised: 02/26/2017] [Accepted: 04/14/2017] [Indexed: 01/21/2023]
Abstract
Somatic cellular differentiation plays a critical role in the transition from unicellular to multicellular life, but the evolution of its genetic basis remains poorly understood. By definition, somatic cells do not reproduce to pass on genes and so constitute an extreme form of altruistic behaviour. The volvocine green algae provide an excellent model system to study the evolution of multicellularity and somatic differentiation. In Volvox carteri, somatic cell differentiation is controlled by the regA gene, which is part of a tandem duplication of genes known as the reg cluster. Although previous work found the reg cluster in divergent Volvox species, its origin and distribution in the broader group of volvocine algae has not been known. Here, we show that the reg cluster is present in many species without somatic cells and determine that the genetic basis for soma arose before the phenotype at the origin of the family Volvocaceae approximately 200 million years ago. We hypothesize that the ancestral function was involved in regulating reproduction in response to stress and that this function was later co-opted to produce soma. Determining that the reg cluster was co-opted to control somatic cell development provides insight into how cellular differentiation, and with it greater levels of complexity and individuality, evolves.
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Affiliation(s)
- Z I Grochau-Wright
- Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - E R Hanschen
- Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - P J Ferris
- Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
| | - T Hamaji
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Tokyo, Japan
| | - H Nozaki
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Tokyo, Japan
| | - B J S C Olson
- Division of Biology, Kansas State University, Manhattan, KS, USA
| | - R E Michod
- Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA
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10
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Umegaki I, Kawauchi S, Sawada H, Nozaki H, Higuchi Y, Miwa K, Kondo Y, Månsson M, Telling M, Coomer FC, Cottrell SP, Sasaki T, Kobayashi T, Sugiyama J. Li-ion diffusion in Li intercalated graphite C6Li and C12Li probed by μ+SR. Phys Chem Chem Phys 2017; 19:19058-19066. [DOI: 10.1039/c7cp02047c] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [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
We have demonstrated that a local magnetic probe, μ+SR, provides a self diffusion coefficient of Li in Li intercalated graphites.
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Affiliation(s)
| | | | | | | | - Yuki Higuchi
- Toyota Central R&D Laboratories, Inc
- Nagakute
- Japan
| | | | | | - Martin Månsson
- Department of Materials and Nanophysics, KTH Royal Institute of Technology
- SE-16440 Kista
- Sweden
| | - Mark Telling
- ISIS Muon Facility
- Rutherford Appleton Laboratory
- Didcot
- UK
| | | | | | | | | | - Jun Sugiyama
- Toyota Central R&D Laboratories, Inc
- Nagakute
- Japan
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11
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Konno T, Yoshida K, Mizuno T, Kawarai T, Tada M, Nozaki H, Ikeda SI, Nishizawa M, Onodera O, Wszolek ZK, Ikeuchi T. Clinical and genetic characterization of adult-onset leukoencephalopathy with axonal spheroids and pigmented glia associated with CSF1R mutation. Eur J Neurol 2016; 24:37-45. [PMID: 27680516 PMCID: PMC5215554 DOI: 10.1111/ene.13125] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 08/09/2016] [Indexed: 01/13/2023]
Abstract
Background and purpose The clinical characteristics of colony stimulating factor 1 receptor (CSF1R) related adult‐onset leukoencephalopathy with axonal spheroids and pigmented glia (ALSP) have been only partially elucidated. Methods Clinical data from CSF1R mutation carriers who had been seen at our institutions or reported elsewhere were collected and analysed using a specific investigation sheet to standardize the data. Results In all, 122 cases from 90 families with CSF1R mutations were identified. The mean age of onset was 43 years (range 18–78 years), the mean age at death was 53 years (range 23–84 years) and the mean disease duration was 6.8 years (range 1–29 years). Women had a significantly younger age of onset than men (40 vs. 47 years, P = 0.0006, 95% confidence interval 3.158–11.177). There was an age‐dependent penetrance that was significantly different between the sexes (P = 0.0013). Motor dysfunctions were the most frequent initial symptom in women whose diseases began in their 20s. Thinning of the corpus callosum, abnormal signalling in pyramidal tracts, diffusion‐restricted lesions and calcifications in the white matter were characteristic imaging findings of ALSP. The calcifications were more frequently reported in our case series than in the literature (54% vs. 3%). Seventy‐nine per cent of the mutations were located in the distal part of the tyrosine kinase domain of CSF1R (102 cases). There were no apparent phenotype−genotype correlations. Conclusions The characteristics of ALSP were clarified. The phenotype of ALSP caused by CSF1R mutations is affected by sex.
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Affiliation(s)
- T Konno
- Department of Neurology, Mayo Clinic, Jacksonville, FL, USA.,Department of Neurology, Niigata University, Niigata, Japan
| | - K Yoshida
- Department of Brain Disease Research, Shinshu University School of Medicine, Matsumoto, Japan
| | - T Mizuno
- Department of Neurology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - T Kawarai
- Department of Clinical Neuroscience, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - M Tada
- Department of Neurology, Niigata University, Niigata, Japan
| | - H Nozaki
- Department of Medical Technology, School of Health Sciences Faculty of Medicine, Niigata University, Niigata, Japan
| | - S-I Ikeda
- Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Matsumoto, Japan
| | - M Nishizawa
- Department of Neurology, Niigata University, Niigata, Japan
| | - O Onodera
- Department of Molecular Neuroscience, Niigata University, Niigata, Japan
| | - Z K Wszolek
- Department of Neurology, Mayo Clinic, Jacksonville, FL, USA
| | - T Ikeuchi
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata, Japan
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12
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Konno T, Broderick DF, Mezaki N, Isami A, Kaneda D, Tashiro Y, Tokutake T, Keegan BM, Woodruff BK, Miura T, Nozaki H, Nishizawa M, Onodera O, Wszolek ZK, Ikeuchi T. Diagnostic Value of Brain Calcifications in Adult-Onset Leukoencephalopathy with Axonal Spheroids and Pigmented Glia. AJNR Am J Neuroradiol 2016; 38:77-83. [PMID: 27633805 DOI: 10.3174/ajnr.a4938] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 07/20/2016] [Indexed: 11/07/2022]
Abstract
Adult-onset leukoencephalopathy with axonal spheroids and pigmented glia is a rare neurodegenerative disease resulting from mutations in the colony stimulating factor 1 receptor gene. Accurate diagnosis can be difficult because the associated clinical and MR imaging findings are nonspecific. We present 9 cases with intracranial calcifications distributed in 2 brain regions: the frontal white matter adjacent to the anterior horns of the lateral ventricles and the parietal subcortical white matter. Thin-section (1-mm) CT scans are particularly helpful in detection due to the small size of the calcifications. These calcifications had a symmetric "stepping stone appearance" in the frontal pericallosal regions, which was clearly visible on reconstructed sagittal CT images. Intrafamilial variability was seen in 2 of the families, and calcifications were seen at birth in a single individual. These characteristic calcification patterns may assist in making a correct diagnosis and may contribute to understanding of the pathogenesis of leukoencephalopathy.
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Affiliation(s)
- T Konno
- From the Departments of Neurology (T.K., Z.K.W.).,Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - D F Broderick
- Radiology (D.F.B.), Mayo Clinic Florida, Jacksonville, Florida
| | - N Mezaki
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - A Isami
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - D Kaneda
- Department of Neurology (D.K.), Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan.,Department of Neurology (D.K.), Osaka Red Cross Hospital, Osaka, Japan
| | - Y Tashiro
- Department of Neurology (Y.T.), National Hospital Organization Mito Medical Center, Ibaraki, Japan
| | - T Tokutake
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - B M Keegan
- Department of Neurology (B.M.K.), Mayo Clinic Rochester, Rochester, Minnesota
| | - B K Woodruff
- Department of Neurology (B.K.W.), Mayo Clinic Arizona, Scottsdale, Arizona
| | - T Miura
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - H Nozaki
- Medical Technology (H.N.), School of Health Sciences Faculty of Medicine, Niigata University, Niigata, Japan
| | - M Nishizawa
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - O Onodera
- Departments of Neurology (T.K., N.M., A.I., T.T., T.M., M.N., O.O.)
| | - Z K Wszolek
- From the Departments of Neurology (T.K., Z.K.W.)
| | - T Ikeuchi
- Molecular Genetics (T.I.), Brain Research Institute
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Hsu YH, Hirota A, Shima S, Nakagawa M, Nozaki H, Tada T, Nakayama M. Structure of Myrocin C, a New Diterpene Antibiotic Produced by a Strain ofMyrotheciumsp. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/00021369.1987.10868553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Okada K, Kawaide H, Miyamoto K, Miyazaki S, Kainuma R, Kimura H, Fujiwara K, Natsume M, Nojiri H, Nakajima M, Yamane H, Hatano Y, Nozaki H, Hayashi KI. HpDTC1, a Stress-Inducible Bifunctional Diterpene Cyclase Involved in Momilactone Biosynthesis, Functions in Chemical Defence in the Moss Hypnum plumaeforme. Sci Rep 2016; 6:25316. [PMID: 27137939 PMCID: PMC4853780 DOI: 10.1038/srep25316] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [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: 03/20/2016] [Accepted: 04/14/2016] [Indexed: 12/02/2022] Open
Abstract
Momilactones, which are diterpenoid phytoalexins with antimicrobial and allelopathic functions, have been found only in rice and the moss Hypnum plumaeforme. Although these two evolutionarily distinct plant species are thought to produce momilactones as a chemical defence, the momilactone biosynthetic pathway in H. plumaeforme has been unclear. Here, we identified a gene encoding syn-pimara-7,15-diene synthase (HpDTC1) responsible for the first step of momilactone biosynthesis in the moss. HpDTC1 is a bifunctional diterpene cyclase that catalyses a two-step cyclization reaction of geranylgeranyl diphosphate to syn-pimara-7,15-diene. HpDTC1 transcription was up-regulated in response to abiotic and biotic stress treatments. HpDTC1 promoter-GUS analysis in transgenic Physcomitrella patens showed similar transcriptional responses as H. plumaeforme to the stresses, suggesting that a common response system to stress exists in mosses. Jasmonic acid (JA), a potent signalling molecule for inducing plant defences, could not activate HpDTC1 expression. In contrast, 12-oxo-phytodienoic acid, an oxylipin precursor of JA in vascular plants, enhanced HpDTC1 expression and momilactone accumulation, implying that as-yet-unknown oxylipins could regulate momilactone biosynthesis in H. plumaeforme. These results demonstrate the existence of an evolutionarily conserved chemical defence system utilizing momilactones and suggest the molecular basis of the regulation for inductive production of momilactones in H. plumaeforme.
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Affiliation(s)
- Kazunori Okada
- Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Hiroshi Kawaide
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Koji Miyamoto
- Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya, 320-8551, Japan
| | - Sho Miyazaki
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Ryosuke Kainuma
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Honoka Kimura
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Kaoru Fujiwara
- Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Masahiro Natsume
- Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwaicho, Fuchu, Tokyo 183-8509, Japan
| | - Hideaki Nojiri
- Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Masatoshi Nakajima
- Department of Applied Biological Chemistry, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hisakazu Yamane
- Department of Biosciences, Teikyo University, 1-1 Toyosatodai, Utsunomiya, 320-8551, Japan
| | - Yuki Hatano
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
| | - Hiroshi Nozaki
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
| | - Ken-Ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
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15
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Tazawa S, Arai Y, Hotta S, Mitsui T, Nozaki H, Ichihara K. Discovery of a Novel Diterpene in Brown Propolis from the State of Parana, Brazil. Nat Prod Commun 2016; 11:201-205. [PMID: 27032202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
Propolis is a resinous substance collected by honeybees from certain plant sources. The components of propolis depend on the vegetation of the area in which apiculture is practiced. In Brazil, there are several types of propolis including 'green,' 'red' and 'brown'. Brazilian brown propolis from the state of Parana characteristically includes diterpenes, and we discovered a novel clerodane diterpene, rel-(5S,6S,8R,9R,10S,18R,19S)-18,19-epoxy-2-oxocleroda-3,12(E),14- triene-6,18,19-triol 18,19-diacetate 6-benzoate (3) and five known diterpenes (1, 2, 4, 5 and 6). The chemical structure of the novel diterpene 3 was determined using 1D- and 2D-NMR spectroscopic analyses. Furthermore, the activities of the isolated diterpenes on growth inhibition of several human cancer cell lines (LNCaP, MCF-7, DLD-1 and A549) were evaluated in vitro; diterpene 3 exhibited a potent inhibition of cell growth, and its activity was approximately 15 times higher than that of the other diterpenes.
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16
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Tazawa S, Arai Y, Hotta S, Mitsui T, Nozaki H, Ichihara K. Discovery of a Novel Diterpene in Brown Propolis from the State of Parana, Brazil. Nat Prod Commun 2016. [DOI: 10.1177/1934578x1601100218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Propolis is a resinous substance collected by honeybees from certain plant sources. The components of propolis depend on the vegetation of the area in which apiculture is practiced. In Brazil, there are several types of propolis including ‘green,’ ‘red’ and ‘brown'. Brazilian brown propolis from the state of Parana characteristically includes diterpenes, and we discovered a novel clerodane diterpene, rel-(5 S,6 S,8 R,9 R,10 S,18 R,19 S)-18,19-epoxy-2-oxocleroda-3,12( E),14-triene-6,18,19-triol 18,19-diacetate 6-benzoate (3) and five known diterpenes (1, 2, 4, 5 and 6). The chemical structure of the novel diterpene 3 was determined using 1D- and 2D-NMR spectroscopic analyses. Furthermore, the activities of the isolated diterpenes on growth inhibition of several human cancer cell lines (LNCaP, MCF-7, DLD-1 and A549) were evaluated in vitro; diterpene 3 exhibited a potent inhibition of cell growth, and its activity was approximately 15 times higher than that of the other diterpenes.
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Affiliation(s)
- Shigemi Tazawa
- Nagaragawa Research Center, API Co., Ltd., 692–3 Nagara, Gifu 502-0071, Japan
| | - Yasuko Arai
- Nagaragawa Research Center, API Co., Ltd., 692–3 Nagara, Gifu 502-0071, Japan
| | - Sho Hotta
- Nagaragawa Research Center, API Co., Ltd., 692–3 Nagara, Gifu 502-0071, Japan
| | - Taichi Mitsui
- Nagaragawa Research Center, API Co., Ltd., 692–3 Nagara, Gifu 502-0071, Japan
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1–1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1–1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Kenji Ichihara
- Nagaragawa Research Center, API Co., Ltd., 692–3 Nagara, Gifu 502-0071, Japan
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17
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Hayashi KI, Kusaka N, Yamasaki S, Zhao Y, Nozaki H. Development of 4-methoxy-7-nitroindolinyl (MNI)-caged auxins which are extremely stable in planta. Bioorg Med Chem Lett 2015; 25:4464-71. [PMID: 26364943 PMCID: PMC4683155 DOI: 10.1016/j.bmcl.2015.09.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 07/09/2015] [Accepted: 09/01/2015] [Indexed: 10/23/2022]
Abstract
Phytohormone auxin is a master regulator in plant growth and development. Regulation of cellular auxin level plays a central role in plant development. Auxin polar transport system modulates an auxin gradient that determines plant developmental process in response to environmental conditions and developmental programs. Photolabile caged auxins allow optical control of artificial auxin gradients at cellular resolution. Especially, two-photon uncaging system achieves high spatiotemporal control of photolysis reaction at two-photon cross-section. However, the development of caged versions of auxin has been limited by the instability of the caged auxins to higher plant metabolic activities. Here, we describe the synthesis and application of highly stable caged auxins, 4-methoxy-7-nitroindolinyl (MNI)-caged auxins. Natural auxin, indole 3-acetic acid, and two synthetic auxins, 1-NAA and 2,4-D were caged by MNI caging group. MNI-caged auxins showed a high stability in planta and a rapid release the original auxin when photolyzed. We demonstrated that optical control of auxin-responsive gene expression and auxin-related physiological responses by using MNI-caged auxins. We anticipate that MNI-caged auxins will be an effective tool for high-resolution control of endogenous auxin level.
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Affiliation(s)
- Ken-Ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan.
| | - Naoyuki Kusaka
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
| | - Soma Yamasaki
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
| | - Yunde Zhao
- Section of Cell and Developmental Biology, University of California at San Diego, La Jolla, CA 92093-0116, United States
| | - Hiroshi Nozaki
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
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18
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Mitsui T, Ishihara R, Hayashi KI, Matsuura N, Akashi H, Nozaki H. Cassane-type diterpenoids from Caesalpinia echinata (Leguminosae) and their NF-κB signaling inhibition activities. Phytochemistry 2015; 116:349-358. [PMID: 25886884 DOI: 10.1016/j.phytochem.2015.03.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [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: 10/02/2014] [Revised: 02/24/2015] [Accepted: 03/28/2015] [Indexed: 06/04/2023]
Abstract
Fourteen cassane-type diterpenoids, echinalides H-U, were isolated from the stem of Caesalpinia echinata Lam. (Leguminosae). The structures of the echinalides were elucidated by spectroscopic investigation, including 2D NMR spectroscopic analysis. The structures of echinalide H and echinalide T were further confirmed by single-crystal X-ray diffraction. The absolute configurations of echinalides H, I, J and K were determined by CD spectroscopy. Additionally, the absolute configurations of echinalide L and M were determined by chemical conversion from echinalide H. These compounds were evaluated for inhibitory activity against nuclear factor κB (NF-κB). Echinalide M showed the most potent inhibitory activity (47±11% at 5μM) toward NF-κB-responsive gene expression.
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Affiliation(s)
- Taichi Mitsui
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Risa Ishihara
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Ken-Ichiro Hayashi
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Nobuyasu Matsuura
- Department of Life Science, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Haruo Akashi
- Research Institute of Natural Sciences, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan
| | - Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama 700-0005, Japan.
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19
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Sugiyama J, Nozaki H, Harada M, Higuchi Y, Sakurai H, Ansaldo EJ, Brewer JH, Keller L, Pomjakushin V, Månsson M. Magnetic Ground State of Novel Zigzag Chain Compounds, NaCr2O4 and Ca1-xNaxCr2O4, Determined with Muons and Neutrons. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.phpro.2015.12.112] [Citation(s) in RCA: 4] [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: 11/15/2022]
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20
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Månsson M, Umegaki I, Nozaki H, Higuchi Y, Kawasaki I, Watanabe I, Sakurai H, Sugiyama J. Na-ion dynamics in Quasi-1D compound NaV2O4. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/551/1/012035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Månsson M, Nozaki H, Wikberg JM, Prša K, Sassa Y, Dahbi M, Kamazawa K, Sedlak K, Watanabe I, Sugiyama J. Lithium Diffusion & Magnetism in Battery Cathode Material LixNi1/3Co1/3Mn1/3O2. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/551/1/012037] [Citation(s) in RCA: 9] [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: 11/11/2022]
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22
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Ohira S, Yokogawa Y, Tsuji S, Mitsui T, Fukukawa T, Hayashi KI, Kuboki A, Matsuura N, Iinuma M, Nozaki H. New naphthoquinone and monoterpenoid from Plumbago zeylanica. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.10.016] [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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23
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Katayama A, Ina K, Nozaki H, Nakayama M. Structural Elucidation of Kurodainol, a Novel Halogenated Monoterpene from Sea Hare (Aplysia Kurodai). ACTA ACUST UNITED AC 2014. [DOI: 10.1080/00021369.1982.10865164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Murakami A, Ohigashi H, Nozaki H, Tada T, Kaji M, Koshimizu K. Possible Inhibitor of Tumor Promotion and Related Polyphenol fromLophira alata, a Medicinal Plant in Tropical West Africa. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/00021369.1991.10870696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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25
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Ohigashi H, Jisaka M, Takagaki T, Nozaki H, Tada T, Huffman MA, Nishida T, Kaji M, Koshimizu K. Bitter Principle and a Related Steroid Glucoside fromVernonia amygdalina, a Possible Medicinal Plant for Wild Chimpanzees. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/00021369.1991.10870699] [Citation(s) in RCA: 3] [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: 10/21/2022]
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26
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Nozaki H, Date S, Kondo H, Kiyohara H, Takaoka D, Tada T, Nakayama M. Ankalactone, a New α,β-Unsaturatedγ-Lactone fromMonascus anka. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/00021369.1991.10870637] [Citation(s) in RCA: 4] [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: 10/21/2022]
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27
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Mitsui T, Ishihara R, Hayashi KI, Sunadome M, Matsuura N, Nozaki H. New Cassane-Type Diterpenoids of Caesalpinia echinata (Leguminosae) Exhibiting NF-κB Inhibitory Activities. Chem Pharm Bull (Tokyo) 2014; 62:267-73. [DOI: 10.1248/cpb.c13-00812] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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)
- Taichi Mitsui
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Risa Ishihara
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Ken-ichiro Hayashi
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Mitsuhisa Sunadome
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Nobuyasu Matsuura
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
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28
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Shimizu T, Nozaki H, Tokuda Y. Steinert's disease. Case Reports 2013; 2013:bcr-2013-201846. [DOI: 10.1136/bcr-2013-201846] [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: 11/03/2022] Open
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29
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Ohira S, Takaya K, Mitsui T, Kido M, Kakumoto K, Hayashi KI, Kuboki A, Tani H, Ikeda S, Iinuma M, Akao Y, Nozaki H. New chalcone dimers from Caesalpinia ferrea Mart act as potent inhibitors of DNA topoisomerase II. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Nozaki H, Månsson M, Roessli B, Pomjakushin V, Kamazawa K, Ikedo Y, Fischer HE, Hansen TC, Yoshida H, Hiroi Z, Sugiyama J. Magnetic structure of the metallic triangular antiferromagnet Ag2NiO2. J Phys Condens Matter 2013; 25:286005. [PMID: 23793164 DOI: 10.1088/0953-8984/25/28/286005] [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] [Indexed: 06/02/2023]
Abstract
The magnetic structure of the metallic antiferromagnet Ag2NiO2 with the Néel temperature TN = 56 K has been investigated by means of a neutron diffraction technique using a powder sample in the temperature range between 5 and 65 K. The antiferromagnetic (AF) diffraction peaks are clearly observed below TN and can be indexed with the propagation vector [Formula: see text]. Based on the results of both a representational analysis and a Rietveld refinement of the magnetic peaks, the AF spin structure is determined as an A-type AF structure with ml = m0cos(2πk ⋅l), where ml is the moment at the lth Ni(3+) site and m0 = (0.31,0,0.65) μB at 5 K.
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Affiliation(s)
- Hiroshi Nozaki
- Toyota Central R & D Laboratories, Inc., 41-1 Yokomichi, Nagakute Aichi 480-1192, Japan.
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Mitsui T, Hayashi KI, Kawai M, Kido M, Tani H, Takaoka D, Matsuura N, Nozaki H. Culcitiolides E–J, Six New Eremophilane-Type Sesquiterpene Derivatives from Senecio culcitioides. Chem Pharm Bull (Tokyo) 2013; 61:816-22. [DOI: 10.1248/cpb.c13-00243] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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)
- Taichi Mitsui
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Ken-ichiro Hayashi
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Mikiko Kawai
- Graduate School of Science and Engineering, Ehime University
| | - Masahiro Kido
- Graduate School of Science and Engineering, Ehime University
| | - Hiroyuki Tani
- Graduate School of Science and Engineering, Ehime University
| | - Daisuke Takaoka
- Department of Chemistry, Faculty of General Education, Ehime University
| | - Nobuyasu Matsuura
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
| | - Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science
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32
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Sugiyama J, Mukai K, Harada M, Nozaki H, Miwa K, Shiotsuki T, Shindo Y, Giblin SR, Lord JS. Reactive surface area of the Lix(Co1/3Ni1/3Mn1/3)O2 electrode determined by μ+SR and electrochemical measurements. Phys Chem Chem Phys 2013; 15:10402-12. [DOI: 10.1039/c3cp51662h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hayashi KI, Kusaka N, Ando K, Mitsui T, Aoyama T, Nozaki H. Design and synthesis of photolabile caged cytokinin. Bioorg Med Chem Lett 2012; 22:5663-7. [PMID: 22832308 DOI: 10.1016/j.bmcl.2012.06.090] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 06/25/2012] [Accepted: 06/27/2012] [Indexed: 11/27/2022]
Abstract
Cytokinins are phytohormones that regulate diverse developmental processes throughout the life of a plant. trans-Zeatin, kinetin, benzyladenine and dihydrozeatin are adenine-type cytokinins that are perceived by the AHK cytokinin receptors. Endogenous cytokinin levels are critical for regulating plant development. To manipulate intracellular cytokinin levels, caged cytokinins were designed on the basis of the crystal structure of the AHK4 cytokinin receptor. The caged cytokinin was photolyzed to release the cytokinin molecule inside the cells and induce cytokinin-responsive gene expression. The uncaging of intracellular caged cytokinins demonstrated that cytokinin-induced root growth inhibition can be manipulated with photo-irradiation. This caged cytokinin system could be a powerful tool for cytokinin biology.
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Affiliation(s)
- Ken-ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan.
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Nozaki H, Hayashi KI, Kawai M, Mitsui T, Kido M, Tani H, Takaoka D, Uno H, Ohira S, Kuboki A, Matsuura N. Culcitiolides A-D, Four New Eremophilane-Type Sesquiterpene Derivatives from Senecio Culcitioides. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Four new eremophilane-type sesquiterpenes, culcitiolides A-D, were isolated from the stem of Senecio culcitioides Sch. Bip (Asteraceae). Their structures were established by detailed 2D NMR spectroscopic and single-crystal X-ray experiments. These compounds were assessed for inhibitory activity against nuclear factor κB (NF-κB). Culcitiolides C and D at 20 μM showed 97 and 100% inhibition of NF-κB activity, respectively.
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Affiliation(s)
- Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
| | - Ken-ichiro Hayashi
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
| | - Mikiko Kawai
- Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577 Japan
| | - Taichi Mitsui
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
| | - Masahiro Kido
- Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577 Japan
| | - Hiroyuki Tani
- Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577 Japan
| | - Daisuke Takaoka
- Department of Chemistry, Faculty of General Education, Ehime University, Matsuyama, 790-8577 Japan
| | - Hidemitsu Uno
- Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577 Japan
| | - Susumu Ohira
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
| | - Atsuto Kuboki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
| | - Nobuyasu Matsuura
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama, 700-0005 Japan
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Nozaki H, Hayashi KI, Kawai M, Mitsui T, Kido M, Tani H, Takaoka D, Uno H, Ohira S, Kuboki A, Matsuura N. Culcitiolides A-D, four new eremophilane-type sesquiterpene derivatives from Senecio culcitioides. Nat Prod Commun 2012; 7:427-430. [PMID: 22574434] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
Four new eremophilane-type sesquiterpenes, culcitiolides A-D, were isolated from the stem of Senecio culcitioides Sch. Bip (Asteraceae). Their structures were established by detailed 2D NMR spectroscopic and single-crystal X-ray experiments. These compounds were assessed for inhibitory activity against nuclear factor kappaB (NF-kappaB). Culcitiolides C and D at 20 microM showed 97 and 100% inhibition of NF-kappaB activity, respectively.
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Affiliation(s)
- Hiroshi Nozaki
- Department of Biological Chemistry, Faculty of Science, Okayama University of Science, Okayama 700-0005, Japan.
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Hayashi KI, Neve J, Hirose M, Kuboki A, Shimada Y, Kepinski S, Nozaki H. Rational design of an auxin antagonist of the SCF(TIR1) auxin receptor complex. ACS Chem Biol 2012; 7:590-8. [PMID: 22234040 DOI: 10.1021/cb200404c] [Citation(s) in RCA: 156] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The plant hormone auxin is a master regulator of plant growth and development. By regulating rates of cell division and elongation and triggering specific patterning events, indole 3-acetic acid (IAA) regulates almost every aspect of plant development. The perception of auxin involves the formation of a ternary complex consisting of an F-box protein of the TIR1/AFB family of auxin receptors, the auxin molecule, and a member the Aux/IAA family of co-repressor proteins. In this study, we identified a potent auxin antagonist, α-(phenylethyl-2-oxo)-IAA, as a lead compound for TIR1/AFB receptors by in silico virtual screening. This molecule was used as the basis for the development of a more potent TIR1 antagonist, auxinole (α-[2,4-dimethylphenylethyl-2-oxo]-IAA), using a structure-based drug design approach. Auxinole binds TIR1 to block the formation of the TIR1-IAA-Aux/IAA complex and so inhibits auxin-responsive gene expression. Molecular docking analysis indicates that the phenyl ring in auxinole would strongly interact with Phe82 of TIR1, a residue that is crucial for Aux/IAA recognition. Consistent with this predicted mode of action, auxinole competitively inhibits various auxin responses in planta. Additionally, auxinole blocks auxin responses of the moss Physcomitrella patens, suggesting activity over a broad range of species. Our works not only substantiates the utility of chemical tools for plant biology but also demonstrates a new class of small molecule inhibitor of protein-protein interactions common to mechanisms of perception of other plant hormones, such as jasmonate, gibberellin, and abscisic acid.
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Affiliation(s)
- Ken-ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan
| | - Joshua Neve
- Centre for Plant Sciences, University
of Leeds, Leeds LS2 9JT, United Kingdom
| | - Masakazu Hirose
- Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan
| | | | - Yukihisa Shimada
- RIKEN Plant Science Center, Tsurumi,
Yokohama, Kanagawa 230-0045, Japan
| | - Stefan Kepinski
- Centre for Plant Sciences, University
of Leeds, Leeds LS2 9JT, United Kingdom
| | - Hiroshi Nozaki
- Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan
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Sugiyama J, Mukai K, Nozaki H, Harada M, Kamazawa K, YutakaIkedo, Månsson M, Ofer O, Ansaldo EJ, Brewer JH, Chow KH, IsaoWatanabe, Miyake Y, Ohzuku T. Lithium Diffusion in Lithium-Transition-Metal Oxides Detected by μ+SR. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.phpro.2012.04.050] [Citation(s) in RCA: 5] [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: 10/28/2022]
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Sugai Y, Ueno Y, Hayashi KI, Oogami S, Toyomasu T, Matsumoto S, Natsume M, Nozaki H, Kawaide H. Enzymatic (13)C labeling and multidimensional NMR analysis of miltiradiene synthesized by bifunctional diterpene cyclase in Selaginella moellendorffii. J Biol Chem 2011; 286:42840-7. [PMID: 22027823 DOI: 10.1074/jbc.m111.302703] [Citation(s) in RCA: 39] [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: 11/06/2022] Open
Abstract
Diterpenes show diverse chemical structures and various physiological roles. The diversity of diterpene is primarily established by diterpene cyclases that catalyze a cyclization reaction to form the carbon skeleton of cyclic diterpene. Diterpene cyclases are divided into two types, monofunctional and bifunctional cyclases. Bifunctional diterpene cyclases (BDTCs) are involved in hormone and defense compound biosyntheses in bryophytes and gymnosperms, respectively. The BDTCs catalyze the successive two-step type-B (protonation-initiated cyclization) and type-A (ionization-initiated cyclization) reactions of geranylgeranyl diphosphate (GGDP). We found that the genome of a lycophyte, Selaginella moellendorffii, contains six BDTC genes with the majority being uncharacterized. The cDNA from S. moellendorffii encoding a BDTC-like enzyme, miltiradiene synthase (SmMDS), was cloned. The recombinant SmMDS converted GGDP to a diterpene hydrocarbon product with a molecular mass of 272 Da. Mutation in the type-B active motif of SmMDS abolished the cyclase activity, whereas (+)-copalyl diphosphate, the reaction intermediate from the conversion of GGDP to the hydrocarbon product, rescued the cyclase activity of the mutant to form a diterpene hydrocarbon. Another mutant lacking type-A activity accumulated copalyl diphosphate as the reaction intermediate. When the diterpene hydrocarbon was enzymatically synthesized from [U-(13)C(6)]mevalonate, all carbons were labeled with (13)C stable isotope (>99%). The fully (13)C-labeled product was subjected to (13)C-(13)C COSY NMR spectroscopic analyses. The direct carbon-carbon connectivities observed in the multidimensional NMR spectra demonstrated that the hydrocarbon product by SmMDS is miltiradiene, a putative biosynthetic precursor of tanshinone identified from the Chinese medicinal herb Salvia miltiorrhiza. Hence, SmMDS functions as a bifunctional miltiradiene synthase in S. moellendorffii. In this study, we demonstrate that one-dimensional and multidimensional (13)C NMR analyses of completely (13)C-labeled compound are powerful methods for biosynthetic studies.
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Affiliation(s)
- Yoshinori Sugai
- Institute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan
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Lai WC, Wang HC, Chen GY, Yang JC, Korinek M, Hsieh CJ, Nozaki H, Hayashi KI, Wu CC, Wu YC, Chang FR. Using the pER8:GUS reporter system to screen for phytoestrogens from Caesalpinia sappan. J Nat Prod 2011; 74:1698-1706. [PMID: 21800859 DOI: 10.1021/np100920q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Arabidopsis thaliana pER8:GUS, a low-cost, highly efficient, and convenient transgenic plant system, was used to assay the estrogen-like activity of 30 traditional Chinese medicines. The MeOH extract of Caesalpinia sappan exhibited significant bioactivity in this assay, and subsequent bioactivity-guided fractionation of the extract led to the isolation of one new compound, (S)-3,7-dihydroxychroman-4-one (1), and 10 known compounds. Both the plant pER8:GUS and in vitro estrogen response element reporter assays were used to evaluate the estrogenic activity of the isolated compounds, and these two systems produced comparable results. Compounds 6, 8, and 11 showed significant estrogenic activity comparable to genistein. These active compounds were determined to be nontoxic new sources of phytoestrogens. In addition, compounds 2 and 3 inhibited ERE transcription induced by 17β-estradiol. A docking model revealed that compounds 6, 8, and 11 showed high affinity to the estrogen receptor. The pER8:GUS reporter system was demonstrated to be a useful and effective technique in phytoestrogen discovery.
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Affiliation(s)
- Wan-Chun Lai
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan, Republic of China
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Nishimoto Y, Shibata M, Nihonmatsu M, Nozaki H, Shiga A, Shirata A, Yamane K, Kosakai A, Takahashi K, Nishizawa M, Onodera O, Suzuki N. A novel mutation in the HTRA1 gene causes CARASIL without alopecia. Neurology 2011; 76:1353-5. [PMID: 21482952 DOI: 10.1212/wnl.0b013e318215281d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Y Nishimoto
- Department of Neurology, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
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Mori T, Kikuzawa Y, Umemoto K, Nozaki H, Seno Y, Takeuchi H. Transistor Performance and Film Structure of Hexabenzocoronene Derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1091-aa11-41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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
AbstractHexabenzocoronene (HBC) derivatives that are designed to self-assemble into lamellar aggregates were synthesized. The derivatives were deposited as an active layer in an organic field-effect transistor (OFET) using vacuum sublimation. The dihexyl and tetrahexyl derivatives (2H-HBC, 4H-HBC) increased the field-effect mobilities and on/off ratios by a factor of 10 or more compared to unsubstituted HBC and hexahexyl-hexabenzocoronene (6H-HBC). The crystal and thin film structures were determined by powder x-ray diffraction and grazing incidence X-ray diffraction (GIXD). The data indicate that 2H-HBC and 4H-HBC self-assemble into lamellar aggregates. 2H-HBC forms layers of aromatic cores that are sandwiched by the layers of hexyl groups, which is a preferable crystal structure for carrier transport. The good OFET performance could be explained by the self-assembly in lamellar aggregates of 2H-HBC and 4H-HBC, in contrast to self-assembly in the columnar aggregate of 6H-HBC and the low self-assembling properties of unsubstituted HBC.
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Kawaide H, Hayashi KI, Kawanabe R, Sakigi Y, Matsuo A, Natsume M, Nozaki H. Identification of the single amino acid involved in quenching the ent-kauranyl cation by a water molecule in ent-kaurene synthase of Physcomitrella patens. FEBS J 2010; 278:123-33. [DOI: 10.1111/j.1742-4658.2010.07938.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Tsuda E, Yang H, Nishimura T, Uehara Y, Sakai T, Furutani M, Koshiba T, Hirose M, Nozaki H, Murphy AS, Hayashi KI. Alkoxy-auxins are selective inhibitors of auxin transport mediated by PIN, ABCB, and AUX1 transporters. J Biol Chem 2010; 286:2354-64. [PMID: 21084292 DOI: 10.1074/jbc.m110.171165] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Polar auxin movement is a primary regulator of programmed and plastic plant development. Auxin transport is highly regulated at the cellular level and is mediated by coordinated transport activity of plasma membrane-localized PIN, ABCB, and AUX1/LAX transporters. The activity of these transporters has been extensively analyzed using a combination of pharmacological inhibitors, synthetic auxins, and knock-out mutants in Arabidopsis. However, efforts to analyze auxin-dependent growth in other species that are less tractable to genetic manipulation require more selective inhibitors than are currently available. In this report, we characterize the inhibitory activity of 5-alkoxy derivatives of indole 3-acetic acid and 7-alkoxy derivatives of naphthalene 1-acetic acid, finding that the hexyloxy and benzyloxy derivatives act as potent inhibitors of auxin action in plants. These alkoxy-auxin analogs inhibit polar auxin transport and tropic responses associated with asymmetric auxin distribution in Arabidopsis and maize. The alkoxy-auxin analogs inhibit auxin transport mediated by AUX1, PIN, and ABCB proteins expressed in yeast. However, these analogs did not inhibit or activate SCF(TIR1) auxin signaling and had no effect on the subcellular trafficking of PIN proteins. Together these results indicate that alkoxy-auxins are inactive auxin analogs for auxin signaling, but are recognized by PIN, ABCB, and AUX1 auxin transport proteins. Alkoxy-auxins are powerful new tools for analyses of auxin-dependent development.
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Affiliation(s)
- Etsuko Tsuda
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama 700-0005, Japan
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Hayashi KI, Horie K, Hiwatashi Y, Kawaide H, Yamaguchi S, Hanada A, Nakashima T, Nakajima M, Mander LN, Yamane H, Hasebe M, Nozaki H. Endogenous diterpenes derived from ent-kaurene, a common gibberellin precursor, regulate protonema differentiation of the moss Physcomitrella patens. Plant Physiol 2010; 153:1085-97. [PMID: 20488896 PMCID: PMC2899919 DOI: 10.1104/pp.110.157909] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Gibberellins (GAs) are a group of diterpene-type plant hormones biosynthesized from ent-kaurene via ent-kaurenoic acid. GAs are ubiquitously present in seed plants. The GA signal is perceived and transduced by the GID1 GA receptor/DELLA repressor pathway. The lycopod Selaginella moellendorffii biosynthesizes GA and has functional GID1-DELLA signaling components. In contrast, no GAs or functionally orthologous GID1-DELLA components have been found in the moss Physcomitrella patens. However, P. patens produces ent-kaurene, a common precursor for GAs, and possesses a functional ent-kaurene synthase, PpCPS/KS. To assess the biological role of ent-kaurene in P. patens, we generated a PpCPS/KS disruption mutant that does not accumulate ent-kaurene. Phenotypic analysis demonstrates that the mutant has a defect in the protonemal differentiation of the chloronemata to caulonemata. Gas chromatography-mass spectrometry analysis shows that P. patens produces ent-kaurenoic acid, an ent-kaurene metabolite in the GA biosynthesis pathway. The phenotypic defect of the disruptant was recovered by the application of ent-kaurene or ent-kaurenoic acid, suggesting that ent-kaurenoic acid, or a downstream metabolite, is involved in protonemal differentiation. Treatment with uniconazole, an inhibitor of ent-kaurene oxidase in GA biosynthesis, mimics the protonemal phenotypes of the PpCPS/KS mutant, which were also restored by ent-kaurenoic acid treatment. Interestingly, the GA(9) methyl ester, a fern antheridiogen, rescued the protonemal defect of the disruption mutant, while GA(3) and GA(4), both of which are active GAs in angiosperms, did not. Our results suggest that the moss P. patens utilizes a diterpene metabolite from ent-kaurene as an endogenous developmental regulator and provide insights into the evolution of GA functions in land plants.
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Affiliation(s)
- Ken-ichiro Hayashi
- Department of Biochemistry, Okayama University of Science, Okayama 700-0005, Japan.
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Okamoto H, Kumai Y, Sugiyama Y, Mitsuoka T, Nakanishi K, Ohta T, Nozaki H, Yamaguchi S, Shirai S, Nakano H. Silicon Nanosheets and Their Self-Assembled Regular Stacking Structure. J Am Chem Soc 2010; 132:2710-8. [DOI: 10.1021/ja908827z] [Citation(s) in RCA: 178] [Impact Index Per Article: 12.7] [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)
- Hirotaka Okamoto
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Yoko Kumai
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Yusuke Sugiyama
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Takuya Mitsuoka
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Koji Nakanishi
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Toshiaki Ohta
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Hiroshi Nozaki
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Satoshi Yamaguchi
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Soichi Shirai
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
| | - Hideyuki Nakano
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan, and The SR Center, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan
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Sugiyama J, Mukai K, Ikedo Y, Nozaki H, Månsson M, Watanabe I. Li diffusion in LixCoO2 probed by muon-spin spectroscopy. Phys Rev Lett 2009; 103:147601. [PMID: 19905603 DOI: 10.1103/physrevlett.103.147601] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Indexed: 05/28/2023]
Abstract
The diffusion coefficient of Li+ ions (D(Li)) in the battery material LixCoO2 has been investigated by muon-spin relaxation (mu+SR). Based on experiments in zero and weak longitudinal fields at temperatures up to 400 K, we determined the fluctuation rate (nu) of the fields on the muons due to their interaction with the nuclear moments. Combined with susceptibility data and electrostatic potential calculations, clear Li+ ion diffusion was detected above approximately 150 K. The D(Li) estimated from nu was in very good agreement with predictions from first-principles calculations, and we present the mu+SR technique as an optimal probe to detect D(Li) for materials containing magnetic ions.
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Affiliation(s)
- Jun Sugiyama
- Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192 Japan.
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Umino Y, Nozaki H, Hamana H, Narita T. Novel anionic polyaddition of 2-trifluoromethylacrylate by double Michael reaction with ethyl cyanoacetate. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23613] [Citation(s) in RCA: 5] [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: 11/07/2022]
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Kusaka N, Maisch J, Nick P, Hayashi KI, Nozaki H. Manipulation of Intracellular Auxin in a Single Cell by Light with Esterase-Resistant Caged Auxins. Chembiochem 2009; 10:2195-202. [DOI: 10.1002/cbic.200900289] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Kusaka N, Maisch J, Nick P, Hayashi KI, Nozaki H. Cover Picture: Manipulation of Intracellular Auxin in a Single Cell by Light with Esterase-Resistant Caged Auxins (ChemBioChem 13/2009). Chembiochem 2009. [DOI: 10.1002/cbic.200990053] [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: 11/11/2022]
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