1
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Abstract
To develop a new nucleoside analogue applicable to oligonucleotide therapeutics, we designed a 4'-thio analogue of an LNA/BNA monomer. Synthesis of 4'-hydroxymethyl-4'-thioribonucleoside was achieved by a tandem ring-contraction-aldol reaction of a 5-thiopyranose derivative and the subsequent Pummerer-type thioglycosylation reaction of the corresponding sulfoxide. Treatment of 4'-hydroxymethyl-4'-thiopyrimidine nucleosides with diphenyl carbonate in the presence of catalytic NaHCO3 gave the desired 4'-thioLNA/BNA monomers, which were introduced into oligonucleotides.
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Affiliation(s)
- Rion Maeda
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Noriko Saito-Tarashima
- Graduate School of Pharmaceutical Science, Tokushima University, Shomachi 1-78-1, Tokushima 770-8505, Japan
| | - Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Noriaki Minakawa
- Graduate School of Pharmaceutical Science, Tokushima University, Shomachi 1-78-1, Tokushima 770-8505, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
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2
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Wakamatsu H, Takahashi A, Ishii A, Kikuchi Y, Sasaki M, Saito Y, Natori Y, Yoshimura Y. Palladium-Catalyzed Three-Component Coupling of Ynamides. Org Lett 2020; 22:5299-5303. [PMID: 32589438 DOI: 10.1021/acs.orglett.0c01426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A palladium-catalyzed regioselective three-component coupling of ynamides was developed. The reaction proceeded smoothly to furnish the desired products when carried out at 70 °C in acetonitrile/water with potassium carbonate in the presence of 2.5 mol % Pd2(dba)3·CHCl3 without a ligand. Various iodides and boronic acids were used in this reaction, and a carbon-carbon bond was formed with satisfactory regioselectivity from the ynamides.
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Affiliation(s)
- Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Ayano Takahashi
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Ayaka Ishii
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Youhei Kikuchi
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Madoka Sasaki
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Yukako Saito
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai 981-8558, Japan
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3
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Wakamatsu H, Itoh M, Natori Y, Yoshimura Y. Synthesis of 2'-aminouridine derivatives as an organocatalyst for Diels-Alder reaction. Nucleosides Nucleotides Nucleic Acids 2019; 39:365-383. [PMID: 31361181 DOI: 10.1080/15257770.2019.1646917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
To develop a novel asymmetric organocatalyst based on a ribonucleoside skeleton, we designed and synthesized 2'-aminouridine derivatives. The synthesized 2'-aminouridines having bulky substituents at both base and sugar moieties could catalyze the Diels-Alder reaction between cinnamaldehyde and cyclopentadiene. However, the optical purities of the resulting products were unexpectedly low.
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Affiliation(s)
- Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Moeko Itoh
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan
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4
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Natori Y, Sakuma T, Watanabe H, Wakamatsu H, Kato A, Adachi I, Takahata H, Yoshimura Y. Catalytic asymmetric synthesis of stereoisomers of 1-C-n-butyl-LABs for the SAR study of α-glucosidase inhibition. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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5
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Abstract
Many attempts have been made to synthesize structurally novel nucleoside derivatives in order to identify effective compounds for the treatment of tumors and virus-caused disease. At our laboratories, as part of our efforts to synthesize 4'-thionucleosides, we have identified and characterized biologically active nucleosides. During the course of our synthetic study, we developed the Pummerer-type thioglycosylation reaction. As a result, we synthesized a potent antineoplastic nucleoside, 1-(2-deoxy-2-fluoro-β-D-4-thio-arabino-furanosyl)cytosine (4'-thioFAC), and several novel 4'-thionucleosides that possess antiherpes virus activities.
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Affiliation(s)
- Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Yukako Saito
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
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6
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Wakamatsu H, Yoshimura Y, Sasaki Y, Kawahata M, Yamaguchi K. Synthesis of Various Heterocycles Having a Dienamide Moiety by Ring-Closing Metathesis of Ene-ynamides. SYNTHESIS-STUTTGART 2018. [DOI: 10.1055/s-0037-1609857] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Ring-closing metathesis (RCM) of ynamides, having alkene substituents of various lengths on the side chain, was demonstrated using the second-generation Grubbs catalyst. When the reaction of ene-ynamides was carried out in the presence of 5 mol% of the catalyst, RCM proceeded smoothly to give quinoline or isoquinoline derivatives having a dienamide unit in good yields. Furthermore, RCM of ene-ynamides, having one more carbon on the side chain, proceeded smoothly to provide seven-membered heterocycles having a dienamide component. Similarly, eight-membered heterocycles, diazocine and benzodiazocine, were also synthesized by RCM of ene-ynamides in good yields.
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Affiliation(s)
- Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Yoshimi Sasaki
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Masatoshi Kawahata
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University
- Laboratory of Pharmaceutical Sciences and Education, Showa Pharmaceutical University
| | - Kentaro Yamaguchi
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University
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7
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Yoshimura Y, Wakamatsu H, Natori Y, Saito Y, Minakawa N. Glycosylation reactions mediated by hypervalent iodine: application to the synthesis of nucleosides and carbohydrates. Beilstein J Org Chem 2018; 14:1595-1618. [PMID: 30013687 PMCID: PMC6037013 DOI: 10.3762/bjoc.14.137] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 06/15/2018] [Indexed: 12/23/2022] Open
Abstract
To synthesize nucleoside and oligosaccharide derivatives, we often use a glycosylation reaction to form a glycoside bond. Coupling reactions between a nucleobase and a sugar donor in the former case, and the reaction between an acceptor and a sugar donor of in the latter are carried out in the presence of an appropriate activator. As an activator of the glycosylation, a combination of a Lewis acid catalyst and a hypervalent iodine was developed for synthesizing 4'-thionucleosides, which could be applied for the synthesis of 4'-selenonucleosides as well. The extension of hypervalent iodine-mediated glycosylation allowed us to couple a nucleobase with cyclic allylsilanes and glycal derivatives to yield carbocyclic nucleosides and 2',3'-unsaturated nucleosides, respectively. In addition, the combination of hypervalent iodine and Lewis acid could be used for the glycosylation of glycals and thioglycosides to produce disaccharides. In this paper, we review the use of hypervalent iodine-mediated glycosylation reactions for the synthesis of nucleosides and oligosaccharide derivatives.
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Affiliation(s)
- Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai, 981-8558, Japan
| | - Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai, 981-8558, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai, 981-8558, Japan
| | - Yukako Saito
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Komatsushima 4-4-1, Aoba-ku, Sendai, 981-8558, Japan
| | - Noriaki Minakawa
- Graduate School of Pharmaceutical Science, Tokushima University, Shomachi 1-78-1, Tokushima, 770-8505, Japan
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8
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Wakamatsu H, Nitta K, Shoji N, Natori Y, Saito Y, Yoshimura Y. Practical Synthesis of 4'-Thioribonucleosides from L-Arabinose via Novel Reductive Ring-Contraction Reaction and Pummerer-Type Thioglycosylation. Curr Protoc Nucleic Acid Chem 2017; 71:1.43.1-1.43.12. [PMID: 29275538 DOI: 10.1002/cpnc.45] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The detailed practical synthesis of 4'-thionucleosides starting from L-arabinose is described here. 1,4-Anhydro-2,3-O-isopropylidene-4-thioribitol, which is the key intermediate for the synthesis of 4'-thionucleosides, is obtained from L-arabinose in several steps, including a novel reductive ring-contraction reaction. After oxidation of the key intermediate, the sulfoxide is subjected to Pummerer-type thioglycosylation in the presence of persilylated nucleobases to obtain the 4'-thioribonucleosides in good yield and β-selectively. © 2017 by John Wiley & Sons, Inc.
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Affiliation(s)
- Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Kozue Nitta
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Nozomi Shoji
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yukako Saito
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Japan
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9
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Wakamatsu H, Yoshimura Y, Yanagisawa R, Kimura S, Osawa N, Natori Y. Palladium-Catalyzed Regioselective Hydroarylation of Ynamides with Aryl Iodides: Easy Synthesis of Various Substituted Enamides Containing Stilbene Derivatives. Synlett 2017. [DOI: 10.1055/s-0036-1588874] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Palladium-catalyzed hydroarylation of ynamides has been developed. The desired coupling products were obtained in good yields and with high regioselectivities. Various aryl iodides can be used in this reaction, permitting the syntheses of many different kinds of enamides from ynamides.
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10
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Takahata H, Yoshimura Y, Kan-no H, Saito Y, Omoto S, Minato S, Wakamatsu H, Natori Y, Imamichi T. Synthesis of a Dihydropyranonucleoside Using an Oxidative Glycosylation Reaction Mediated by Hypervalent Iodine. SYNTHESIS-STUTTGART 2014. [DOI: 10.1055/s-0033-1340663] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hiroki Takahata
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Hiroya Kan-no
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Yukako Saito
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Shun Omoto
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Sakie Minato
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Hideaki Wakamatsu
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Yoshihiro Natori
- Faculty of Pharmaceutical Sciences, Tohoku Pharmaceutical University
| | - Tomozumi Imamichi
- Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research
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11
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Yoshiike F, Koizumi T, Kitaguchi Y, Hatayama O, Yasuo M, Sasabayashi M, Wakamatsu H, Fujimoto K, Kubo K. Phase I Trial of Nedaplatin and Paclitaxel for Patients with Non-Small Cell Lung Cancer. J Chemother 2013; 17:550-4. [PMID: 16323445 DOI: 10.1179/joc.2005.17.5.550] [Citation(s) in RCA: 4] [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: 10/31/2022]
Abstract
A phase I study was conducted to evaluate the maximum tolerated dose and feasibility of combination with nedaplatin (NDP) and paclitaxel in patients with non-small cell lung cancer (NSCLC). Fifteen patients under 75 years old, with unresectable NSCLC who had not previously received chemotherapy or radiotherapy, with a performance status of 0-1, were enrolled. The dose escalation levels (NDP/Paclitaxel; mg/m2 day 1) were 80/150 (level 1), 80/180 (level 2), 90/180 (level 3) and repeated every 28 days. All patients receiving level 3 had dose-limiting toxicity. One patient developed grade 4 neutropenia with infection, two had incomplete recovery of neutropenia and thrombocytopenia by the 28th day after the first cycle of chemotherapy. Non-hematologic toxicities, including nephrotoxicity, nausea/vomiting, alopecia, and hypersensitivity reaction, were tolerated. Three of the 15 patients achieved partial responses. We concluded that the recommended dose was paclitaxel 180 and NDP 80 mg/m2 due to the hematologic toxicity.
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Affiliation(s)
- F Yoshiike
- First Department of Internal Medicine, Shinshu University School of Medicine, Japan
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12
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Kiran Y, Wakamatsu H, Natori Y, Takahata H, Yoshimura Y. Design and synthesis of a nucleoside and a phosphonate analogue constructed on a branched-threo-tetrofuranose skeleton. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.05.062] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [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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13
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Saito Y, Yoshimura Y, Wakamatsu H, Takahata H. A facile synthesis of fully protected meso-diaminopimelic acid (DAP) and its application to the preparation of lipophilic N-acyl iE-DAP. Molecules 2013; 18:1162-73. [PMID: 23325104 PMCID: PMC6270281 DOI: 10.3390/molecules18011162] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/08/2013] [Accepted: 01/09/2013] [Indexed: 11/23/2022] Open
Abstract
Synthesis of beneficial protected meso-DAP 9 by cross metathesis of the Garner aldehyde-derived vinyl glycine 1b with protected allyl glycine 2 in the presence of Grubbs second-generation catalyst was performed. Preparation of lipophilic N-acyl iE-DAP as potent agonists of NOD 1-mediated immune response from 9 is described.
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Affiliation(s)
| | | | | | - Hiroki Takahata
- Author to whom correspondence should be addressed; E-Mail: ; Tel./Fax: +81-22-727-0144
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14
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Oie S, Arakawa J, Furukawa H, Matsumoto S, Matsuda N, Wakamatsu H. Microbial contamination of a disinfectant-soaked unwoven cleaning cloth. J Hosp Infect 2012; 82:61-3. [DOI: 10.1016/j.jhin.2012.06.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Accepted: 06/08/2012] [Indexed: 10/28/2022]
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15
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Wakamatsu H, Hareyama S, Takeshita M. Ring-opening metathesis and ring-closing metathesis of bicyclo[4.2.0]octene-ynes: Application to the synthesis of tricyclic compounds. ARKIVOC 2011. [DOI: 10.3998/ark.5550190.0012.409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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16
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Nishiyama M, Yoshida Y, Sato M, Nishioka M, Kato T, Kanai T, Ishiwata T, Wakamatsu H, Nakagawa S, Kawana A, Nonoyama S. Characteristics of paediatric patients with 2009 pandemic influenza A(H1N1) and severe, oxygen-requiring pneumonia in the Tokyo region, 1 September-31 October 2009. Euro Surveill 2010; 15:19659. [PMID: 20843469] [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: 05/29/2023] Open
Abstract
Few reports describe the features of 2009 pandemic influenza A(H1N1) pneumonia in children. We retrospectively reviewed 21 consecutive children admitted to hospital from September to October 2009 in the Tokyo region. The diagnosis of 2009 pandemic influenza A(H1N1) virus infection was based on positive results of real-time RT-PCR or rapid influenza antigen test. All patients were hospitalised for pneumonia with respiratory failure and severe hypoxia. The median interval from onset of influenza symptoms to admission was 14 hours (range: 5-72 hours) and the median interval from the onset of fever (≥38 degrees C) to hospitalisation was 8.5 hours (range: 0-36 hours). All patients required oxygen inhalation. Four patients required mechanical ventilation. Chest radiography revealed patchy infiltration or atelectasis in all patients. Antiviral agents and antibiotics were administrated to all patients. Antiviral agents were administered to 20 patients within 48 hours of influenza symptom onset. No deaths occurred during the study period. Paediatric patients with this pneumonia showed rapid aggravation of dyspnoea and hypoxia after the onset of influenza symptoms.
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MESH Headings
- Adolescent
- Anti-Bacterial Agents/therapeutic use
- Antiviral Agents/therapeutic use
- Child
- Child, Preschool
- Combined Modality Therapy
- Comorbidity
- Dyspnea/epidemiology
- Dyspnea/etiology
- Dyspnea/therapy
- Female
- Hospitalization
- Humans
- Hypoxia/epidemiology
- Hypoxia/etiology
- Hypoxia/therapy
- Influenza A Virus, H1N1 Subtype/isolation & purification
- Influenza, Human/complications
- Influenza, Human/drug therapy
- Influenza, Human/epidemiology
- Influenza, Human/virology
- Japan/epidemiology
- Male
- Oxygen Inhalation Therapy/statistics & numerical data
- Pneumonia, Viral/complications
- Pneumonia, Viral/diagnostic imaging
- Pneumonia, Viral/drug therapy
- Pneumonia, Viral/epidemiology
- Pneumonia, Viral/therapy
- Pneumonia, Viral/virology
- Pulmonary Atelectasis/epidemiology
- Pulmonary Atelectasis/etiology
- Pulmonary Atelectasis/therapy
- Radiography
- Respiration, Artificial/statistics & numerical data
- Respiratory Insufficiency/epidemiology
- Respiratory Insufficiency/etiology
- Respiratory Insufficiency/therapy
- Retrospective Studies
- Time Factors
- Urban Population/statistics & numerical data
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Affiliation(s)
- M Nishiyama
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan.
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Nishiyama M, Yoshida Y, Sato M, Nishioka M, Kato T, Kanai T, Ishiwata T, Wakamatsu H, Nakagawa S, Kawana A, Nonoyama S. Characteristics of paediatric patients with 2009 pandemic influenza A(H1N1) and severe, oxygen-requiring pneumonia in the Tokyo region, 1 September–31 October 2009. Euro Surveill 2010. [DOI: 10.2807/ese.15.36.19659-en] [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] [Indexed: 11/20/2022] Open
Abstract
Binary file ES_Abstracts_Final_ECDC.txt matches
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Affiliation(s)
- M Nishiyama
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - Y Yoshida
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - M Sato
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - M Nishioka
- Department of Paediatrics, Kawaguchi Municipal Medical Centre, Kawaguchi, Japan
| | - T Kato
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - T Kanai
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - T Ishiwata
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - H Wakamatsu
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
| | - S Nakagawa
- Department of Intensive care, National Centre for Child Health and Development, Tokyo, Japan
| | - A Kawana
- Department of Internal Medicine 2, Division of Infectious Disease and Pulmonary Medicine, National Defence Medical College, Tokorozawa, Japan
| | - S Nonoyama
- Department of Paediatrics, National Defence Medical College, Tokorozawa, Japan
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Wakamatsu H, Takeshita M. Copper-Free Sonogashira Cross-Coupling of Ynamides: Easy Access to Various Substituted Ynamides from Nonsubstituted Ynamides. Synlett 2010. [DOI: 10.1055/s-0030-1258023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Wakamatsu H, Sakagami M, Hanata M, Takeshita M, Mori M. Ring-Closing Metathesis of Ene-Ynamide: Application to the Synthesis of Medium-Sized Cyclic Dienamide. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.200900035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Wakamatsu H, Utsuki T, Mitaka C, Ohno K. Clinical system engineering of long-term automatic thermal control during brain hypothermia under changing conditions. Technol Health Care 2010; 18:181-201. [PMID: 20639595 DOI: 10.3233/thc-2010-0581] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Automatic control systems of brain temperature for water surface-cooling were first-ever applied to the brain hypothermic treatment of patients. A patient in ICU was regarded as a unity controlled system with an input (temperature of water into blanket) and an output (tympanic membrane temperature). The proposed algorithm of optimal-adaptive and fuzzy control laws inclusive of our developed cooling and warming machine were well confirmed during the hypothermic course to keep brain temperature of patients within its allowable range. It was well controlled without much influence due to room temperature, metabolic and circulatory change caused by various medical treatments including the effect of nonlinear and time-varying characteristics of individual patients. The clinical control of brain temperature was almost continuously performed in around 10 days, under the brain temperature between 35 degrees C and 37 degrees C scheduled by physicians according to the state of patients. Their state had been monitored during the therapeutic course of pharmacological treatment with almost everyday examinations by CT imaging, referring various vital signs inclusive of the temperature of urinary bladder with continuous measurement of intracranial pressure by a catheter placement in cerebral sinus. The patients had good recovery to their rehabilitation after mild hypothermia by the proposed automatic control systems.
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Affiliation(s)
- H Wakamatsu
- Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
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Wakamatsu H, Saito Y, Masubuchi M, Fujita R. Synthesis of Imidazolium-Tagged
Ruthenium Carbene Complex: Remarkable Activity and Reusability in
Regard to Olefin Metathesis in Ionic Liquids. Synlett 2008. [DOI: 10.1055/s-2008-1077888] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [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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Wakamatsu H, Sato Y, Fujita R, Mori M. Synthesis of Pyrrolizidine, Indolizidine, and Quinolizidine Derivatives Using Ruthenium-Catalyzed Ring-Opening Metathesis and Ring-Closing Metathesis of Cycloalkene-ynes. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600539] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sato Y, Satokawa H, Takase S, Misawa Y, Wakamatsu H, Sato Y, Yokoyama H. [Therapeutic strategies for acute type A aortic dissection]. Kyobu Geka 2007; 60:262-6. [PMID: 17416090] [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: 05/14/2023]
Abstract
We herein present the early and mid-term outcomes of therapeutic strategies for acute type A aortic dissection in our department. Subjects were 75 patients who were admitted to our department from January 2001 to October 2006. A total of 33 patients had thrombosed dissection: emergent surgery was indicated for cases in which the maximal ascending aortic diameter was > or =50 mm or when ulcer-like projection (ULP) was observed in the ascending aorta. Only 1 case of rupture-related death was observed, in a patient who had a maximal ascending aortic diameter of 52 mm and refused surgery. Although 8 patients were converted to surgery during the chronic phase, elective surgery was recommended in all cases. Surgery consisted of entry resection using open distal anastomosis under circulatory arrest at a bladder temperature of 25 degrees C, with antegrade cerebral perfusion into the 3 cervical branches of arch aorta based on bilateral axillary artery. In-hospital mortality of the 62 patients who underwent surgery was low (4.8%) and no dissection-related deaths were reported for the midterm outcomes. In addition, a low rate of cerebral infarction was observed among cases who had residual dissection of the brachiocephalic arteries after surgery. These findings demonstrate the validity of the therapeutic strategies in our department.
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Affiliation(s)
- Yoichi Sato
- Yoichi Sato et al., Department of Cardiovascular Surgery, School of Medicine, Fukushima Medical University, Fukushima, Japan
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Mori M, Wakamatsu H, Sato Y, Fujita R. ROM–RCM of azabicycloheptene derivatives—Study of products distribution by the substituent on alkyne. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2005.12.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mori M, Wakamatsu H, Saito N, Sato Y, Narita R, Sato Y, Fujita R. Synthesis of cyclic dienamide using ruthenium-catalyzed ring-closing metathesis of ene–ynamide. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.11.083] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [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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Fujita R, Yoshisuji T, Wakayanagi S, Wakamatsu H, Matsuzaki H. Synthesis of 5(6H)-Phenanthridones Using Diels-Alder Reaction of 3-Nitro-2(1H)-quinolones Acting as Dienophiles. Chem Pharm Bull (Tokyo) 2006; 54:204-8. [PMID: 16462064 DOI: 10.1248/cpb.54.204] [Citation(s) in RCA: 14] [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: 11/22/2022]
Abstract
Diels-Alder reactions of 3-nitro-2(1H)-quinolones with 1,3-butadiene derivatives were carried out to give the phenanthridone derivatives under both atmospheric and high pressure conditions. Furthermore, the reactivity of 3-substituted 2(1H)-quinolones acting as a dienophile with 2,3-dimethyl-1,3-butadiene was examined using molecular orbital (MO) calculation.
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Affiliation(s)
- Reiko Fujita
- Tohoku Pharmaceutical University, Sendai, Japan.
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Abstract
A novel Diels-Alder (DA) reaction with 4-nitro-1(2H)-isoquinolones acting as the dienophile afforded 5(6H)-phenanthridone derivatives. The DA reaction of 4-nitro-1(2H)-isoquinolone with 1-methoxy-1,3-butadiene gave biologically active 5(6H)-phenanthridone possessing in a high yield. Regioselectivity of 4-nitro-1(2H)-isoquinolones with 1-methoxy-3-silyloxy-1,3-butadiene was calculated using molecular orbital (MO) calculations.
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Mori M, Wakamatsu H, Tonogaki K, Fujita R, Kitamura T, Sato Y. Synthesis of Isoquinoline Derivatives Using ROM−RCM of Cyclobutene-yne. J Org Chem 2005; 70:1066-9. [PMID: 15675873 DOI: 10.1021/jo048214c] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Isoquinoline derivatives were synthesized from cyclobutenylmethylamine derivatives having an alkyne moiety in a tether using a second-generation ruthenium carbene complex under ethylene gas in good yields.
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Affiliation(s)
- Miwako Mori
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
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Blechert S, Buschmann N, Wakamatsu H. An Easily Assembled Highly Active Ruthenium Initiator for Olefin Metathesis. Synlett 2004. [DOI: 10.1055/s-2004-817777] [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: 10/26/2022]
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Sato Y, Imakuni N, Hirose T, Wakamatsu H, Mori M. Further studies on palladium-catalyzed bismetallative cyclization of enynes in the presence of Bu3SnSiMe3. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00601-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wakamatsu H, Noguchi S, Yamashita H, Yamashita H, Tamura S, Jinnouchi S, Nagamachi S, Futami S. Parathyroid scintigraphy with 99mTc-MIBI and 123I subtraction: a comparison with magnetic resonance imaging and ultrasonography. Nucl Med Commun 2003; 24:755-62. [PMID: 12813193 DOI: 10.1097/00006231-200307000-00004] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [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: 11/25/2022]
Abstract
The aim of this study was to evaluate the efficacy of 99mTc-MIBI and 123I subtraction scintigraphy for the detection of abnormal parathyroid glands to be referred for surgical treatment. Thirty-nine consecutive patients, including 35 primary and four secondary cases of hyperparathyroidism, were evaluated. 99mTc-MIBI/123I subtraction scintigraphy (MIBI/I) was performed on all patients, and the results were compared with delayed images of 99mTc-MIBI (D-MIBI), magnetic resonance imaging (MRI) and ultrasonography (US). The overall sensitivity of MIBI/I, MRI, US and D-MIBI was 55.9%, 43.4%, 50.8% and 39.0%, respectively. In cases of single-gland disease, the sensitivity of MIBI/I, MRI, US and D-MIBI was 62.1%, 48.3%, 55.2% and 44.8%, respectively. In cases of multi-gland disease, the sensitivity of MIBI/I, MRI, US and D-MIBI was 50.0%, 37.5%, 46.7% and 36.7%, respectively. In cases of parathyroid adenoma, the sensitivity of MIBI/I, MRI, US and D-MIBI was 71.4%, 50.0%, 71.4% and 50.0%, respectively. In cases of parathyroid hyperplasia, the sensitivity of MIBI/I, MRI, US and D-MIBI was 55.2%, 42.3%, 50.0% and 39.7%, respectively. It is concluded that 99mTc-MIBI/123I subtraction is more useful than the delayed imaging of 99mTc-MIBI, MRI and US.
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Affiliation(s)
- H Wakamatsu
- Department of Radiology, Noguchi Thyroid Clinic and Hospital Foundation, Oita, Japan.
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Affiliation(s)
- Hideaki Wakamatsu
- Institut für Chemie, Technische Universität Berlin Strasse des 17. Juni 135, 10623 Berlin, Germany
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Nakano Y, Gido T, Honda S, Maezawa A, Wakamatsu H, Yanagita T. Improved computed radiography image quality from a BaFl:Eu photostimulable phosphor plate. Med Phys 2002; 29:592-7. [PMID: 11991131 DOI: 10.1118/1.1462639] [Citation(s) in RCA: 18] [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: 11/07/2022] Open
Abstract
Recent advances in the design of photostimulable phosphor (PSP) plates for computed radiography (CR) systems have made it possible to manufacture plates made of BaFI:Eu phosphor material in the cassette form. The image quality of this plate, six BaF(Br,I):Eu plates, and one BaFBr:Eu plate were evaluated in terms of presampling modulation transfer function (MTF), normalized Wiener spectra (WSN), and detective quantum efficiency (DQE). Compared with the best-performing BaF(Br,I):Eu plate, the BaFI:Eu plate provided DQE that was higher, at spatial frequencies of 0.5, 1.0, and 2.0 cycles/mm, by 12% (21.8 versus 19.4), 13% (18.8 versus 16.7), and 11% (12.0 versus 10.8), respectively. Since presampling MTF values of the two plates were comparable, the BaFI:Eu plate's higher DQE is attributable to total WSN conversely being lower by 17% [8.65 x 10(-5) (mm2) versus 10.38 x 10(-5) (mm2)], 17% [5.85 x 10(-5) (mm2) versus 7.03 x 10(-5) (mm2)], and 12% [2.82 x 10(-5) (mm2) versus 3.19 x 10(-5) (mm2)] at the specified frequencies, respectively, primarily due to the contribution of x-ray quantum WSN. This jibes with the high x-ray absorption provided by the 27%-higher x-ray attenuation coefficients (7.54 versus 6.07, at 60 KeV) that BaFI offers over BaF(Br(0.85),I(0.15)), a result of the high atomic number of BaFI's exclusively iodine halide content. The results were consistent with earlier studies of several of these same plates and indicate that BaFI:Eu is a promising avenue to lower image noise and higher overall CR system image quality.
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Affiliation(s)
- Yasushi Nakano
- MG Imaging R&D Center, Konica Corporation, Hino-shi, Tokyo, Japan
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Affiliation(s)
- Hideaki Wakamatsu
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany
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Randl S, Gessler S, Wakamatsu H, Blechert S. Highly Selective Cross Metathesis with Acrylonitrile Using a Phosphine Free Ru-Complex. Synlett 2001. [DOI: 10.1055/s-2001-11393] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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42
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Wakamatsu H, Noguchi S, Yamashita H, Yamashita H, Tamura S, Jinnouchi S, Nagamachi S, Futami S. Technetium-99m tetrofosmin for parathyroid scintigraphy: a direct comparison with (99m)Tc-MIBI, (201)Tl, MRI and US. Eur J Nucl Med 2001; 28:1817-27. [PMID: 11734921 DOI: 10.1007/s002590100627] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this study was to evaluate the efficacy and role of technetium-99m tetrofosmin for the detection of abnormal parathyroid glands to be referred for surgical treatment. Twenty-eight consecutive patients, including 25 primary and 3 secondary cases of hyperparathyroidism, were evaluated. (99m)Tc-tetrofosmin/(99m)Tc-pertechnetate subtraction scintigraphy (TF/Tc) was performed on all patients, and the results were directly compared with those of (99m)Tc-methoxyisobutylisonitrile (MIBI)/(99m)Tc-pertechnetate subtraction scintigraphy (MIBI/Tc), (201)Tl/(99m)Tc-pertechnetate subtraction scintigraphy (Tl/Tc), magnetic resonance imaging (MRI) and ultrasonography (US). In cases of single-gland disease, the sensitivities of TF/Tc, MIBI/Tc, Tl/Tc, MRI and US were 63.2%, 68.4%, 57.9%, 55.6% and 63.2%, respectively. In cases of multi-gland disease, the sensitivities of TF/Tc, MIBI/Tc, Tl/Tc, MRI and US were 41.7%, 41.7%, 37.5%, 58.3% and 54.2%, respectively. In cases of parathyroid adenoma, the sensitivities of TF/Tc, MIBI/Tc, Tl/Tc, MRI and US were 68.8%, 75.0%, 68.8%, 62.5% and 75.0%, respectively. In cases of parathyroid hyperplasia, the sensitivities of TF/Tc, MIBI/Tc, Tl/Tc, MRI and US were 40.7%, 40.7%, 33.3%, 53.8% and 48.1%, respectively. It is concluded that, for the detection of abnormal parathyroid glands, (99m)Tc-tetrofosmin is as useful as (99m)Tc-MIBI and is more useful than (201)Tl.
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Affiliation(s)
- H Wakamatsu
- Department of Radiology, Noguchi Thyroid Clinic and Hospital Foundation, 6-33, Noguchi-Nakamachi, Beppu, Oita, Japan 874-0932.
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Affiliation(s)
- Miwako Mori
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Tomohiro Hirose
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Hideaki Wakamatsu
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Noriko Imakuni
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Yoshihiro Sato
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
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Wakamatsu H, Yoshinobu Y, Aida R, Moriya T, Akiyama M, Shibata S. Restricted-feeding-induced anticipatory activity rhythm is associated with a phase-shift of the expression of mPer1 and mPer2 mRNA in the cerebral cortex and hippocampus but not in the suprachiasmatic nucleus of mice. Eur J Neurosci 2001; 13:1190-6. [PMID: 11285016 DOI: 10.1046/j.0953-816x.2001.01483.x] [Citation(s) in RCA: 261] [Impact Index Per Article: 11.3] [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
Daily restricted feeding (RF) can produce food-entrainable oscillations in both intact and suprachiasmatic nucleus (SCN)-lesioned animals. Thus, there are two circadian rhythms, one of which is SCN-dependent and the other SCN-independent. Recently, it has been established that several mouse clock genes, such as mPer1, mPer2 and mPer3 are expressed in the SCN and other brain tissues. Although the role of mPer genes expressed in the SCN has recently been evaluated in the SCN-dependent rhythm, their function in the SCN-independent rhythm is still poorly understood. In order to understand the role of these genes in SCN-independent rhythm, we examined the expression pattern of mPer1 and mPer2 mRNA in each brain area of mice under RF. Mice were allowed access to food for 4 h during either the daytime under a light-dark cycle or the subjective daytime under constant dark. After 6 days of scheduled RF, the night-time or subjective night-time peak of mPer mRNA changed to a daytime peak in the cerebral cortex and hippocampus, with moderate expression in the striatum, pyriform cortex and paraventricular nucleus, and no expression in the SCN. The daytime peak in the cerebral cortex returned to a night-time peak after the release of RF to a free-feeding schedule. Although the basal rhythm of mPer expression disappeared in SCN-lesioned mice, RF produced mPer mRNA rhythm in the cerebral cortex of these mice. The present results provide evidence of an association between food-entrainable oscillations and the expression of mPer1 and mPer2 in the cerebral cortex and hippocampus.
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Affiliation(s)
- H Wakamatsu
- Department of Pharmacology and Brain Science, School of Human Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
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Hara R, Wan K, Wakamatsu H, Aida R, Moriya T, Akiyama M, Shibata S. Restricted feeding entrains liver clock without participation of the suprachiasmatic nucleus. Genes Cells 2001; 6:269-78. [PMID: 11260270 DOI: 10.1046/j.1365-2443.2001.00419.x] [Citation(s) in RCA: 425] [Impact Index Per Article: 18.5] [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
BACKGROUND There are two main stimuli that entrain the circadian rhythm, the light-dark cycle (LD) and restricted feeding (RF). Light-induced entrainment requires induction of the Per1 and Per2 genes in the suprachiasmatic nucleus (SCN), the locus of a main oscillator. In this experiment, we determined whether RF resets the expression of circadian clock genes in the mouse liver with or without participation of the SCN. RESULTS Mice were allowed access to food for 4 h during the daytime (7 h advance of feeding time) under LD or constant darkness (DD). The peaks of mPer1, mPer2, D-site-binding protein (Dbp) and cholesterol 7alpha-hydroxylase (Cyp7A) mRNA in the liver were advanced 6-12 h after 6 days of RF, whereas those in SCN were unaffected. The advance of mPer expression in the liver by RF was still observed in SCN-lesioned mice. A 7 h advance in the LD cycle advanced the peaks of clock gene expression in both the liver and SCN, whereas, a shift in the LD did not move the phase of the liver clock when the shift was carried out under a fixed RF schedule during the night-time. CONCLUSIONS These results suggest that restricted feeding strongly entrained the expression of circadian clock genes in the liver without the participation of an SCN clock function.
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Affiliation(s)
- R Hara
- Department of Pharmacology and Brain Science, School of Human Sciences and Advanced Research Center for Human Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
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Shimomura H, Moriya T, Sudo M, Wakamatsu H, Akiyama M, Miyake Y, Shibata S. Differential daily expression of Per1 and Per2 mRNA in the suprachiasmatic nucleus of fetal and early postnatal mice. Eur J Neurosci 2001; 13:687-93. [PMID: 11207804 DOI: 10.1046/j.0953-816x.2000.01438.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [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
It is well known that there are circadian rhythms of 2-deoxyglucose uptake and neuronal firing in the rat suprachiasmatic nucleus (SCN) during fetal and early postnatal periods. A core clock mechanism in the mouse SCN appears to involve a transcriptional feedback loop in which CLOCK and BMAL1 function as positive regulators and three mPeriod (mPer) genes play a role in negative feedback. Per genes expression occurs not only in the adult SCN but also in the fetal SCN. However, the developmental change in these genes remains unclear. In this experiment, we examined the day--night pattern of expression of Per1 and Per2 mRNA in the mouse SCN and cerebral cortex on embryonic day 17, postnatal day 3, and in young adult mice under a light-dark cycle. Daily rhythms of mRNA content were observed in mPer1 but not mPer2 in the fetal SCN. Interestingly, the expression of mPer2 in the SCN was high throughout the entire day, and a significant daily rhythm of this gene was observed on postnatal day 6. The expression pattern of SCN mPer1 in constant darkness was similar to that seen in the light-dark cycle. The present results suggest that the daily oscillation of mPer1 but not of mPer2 in the SCN in fetal and early postnatal mice may be associated with the daily rhythms of 2-deoxyglucose uptake and neuronal firing.
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Affiliation(s)
- H Shimomura
- Department of Pharmacology and Brain Science, School of Human Science, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
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Matsumoto M, Ohtake K, Wakamatsu H, Oka S, Kiyoshima T, Nakakimura K, Sakabe T. The time course of acquisition of ischemic tolerance and induction of heat shock protein 70 after a brief period of ischemia in the spinal cord in rabbits. Anesth Analg 2001; 92:418-23. [PMID: 11159244 DOI: 10.1097/00000539-200102000-00027] [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: 11/26/2022]
Abstract
We examined the time course of development of ischemic tolerance in the spinal cord and sought its mechanism exploring the expression of heat shock protein 70 (HSP70). Spinal cord ischemia was produced in rabbits by occlusion of the abdominal aorta. In Experiment 1, neurologic and histopathologic outcome was evaluated 48 h after prolonged ischemia (20 min) that was given 2 days, 4 days, or 7 days after a short period of ischemia (ischemic pretreatment) sufficient to abolish postsynaptic component of spinal cord evoked potentials. Control animals were given prolonged ischemia 4 days after sham operation. In Experiment 2, HSP70 expression in motor neurons after pretreatment without exposure to prolonged ischemia was examined by immunohistochemical staining. Ischemic pretreatment 4 days (but not 2 days or 7 days) before 20 min ischemia exhibited protective effects against spinal cord injury. In the cytoplasm, HSP70 immunoreactivity was mildly increased after 2, 4, and 7 days of ischemic pretreatment. However, the incidence of nuclear HSP70 immunoreactivity 2 days, 4 days, and 7 days after ischemic pretreatment was 2 of 6 animals, 4 of 6 animals, and 1 of 6 animals, respectively (none in the control group). These results suggest that ischemic tolerance is apparent 4 days after ischemic pretreatment and that HSP70 immunoreactivity in the nucleus may provide some insight into the mechanisms of ischemic tolerance in the spinal cord.
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Affiliation(s)
- M Matsumoto
- Department of Anesthesiology-Resuscitology, Yamaguchi University School of Medicine, Ube, Japan
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Wakamatsu H, Takahashi S, Moriya T, Inouye ST, Okamura H, Akiyama M, Shibata S. Additive effect of mPer1 and mPer2 antisense oligonucleotides on light-induced phase shift. Neuroreport 2001; 12:127-31. [PMID: 11201072 DOI: 10.1097/00001756-200101220-00033] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [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: 11/26/2022]
Abstract
It is well known that light induces both mPer1 and mPer2 mRNA in the suprachiasmatic nucleus. We have reported that mPer1 antisense oligonucleotides (ODNs) inhibited the light-induced phase delays of mouse locomotor rhythm. In this study, we asked whether both or either mPer1 or mPer2 expression is necessary to induce the phase shift. We examined the effects of inhibition of mRNA expression on light-induced phase delays of mouse circadian behavior rhythm. Light-induced phase delays were moderately attenuated by microinjection of mPer1 or mPer2 antisense ODN, but not by mPer3 antisense or mPer1, mPer2 scrambled ODNs, whereas following simultaneous injection of both mPer1 and mPer2 antisense ODNs they disappeared. The present results suggest that acute induction of mPer1 and mPer2 gene play an additive effect on photic entrainment.
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Affiliation(s)
- H Wakamatsu
- Department of Pharmacology and Brain Science, School of Human Sciences, Waseda University, Tokorozawa, Saitama, Japan
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Motohashi Y, Maeda A, Wakamatsu H, Higuchi S, Yuasa T. Circadian rhythm abnormalities of wrist activity of institutionalized dependent elderly persons with dementia. J Gerontol A Biol Sci Med Sci 2000; 55:M740-3. [PMID: 11129396 DOI: 10.1093/gerona/55.12.m740] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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: 11/13/2022] Open
Abstract
BACKGROUND The study objective was to clarify the descriptive characteristics of circadian rhythm abnormalities of wrist activity of the institutionalized elderly with dementia. METHODS We studied 82 elderly persons with dementia who were institutionalized in a long-term medical care facility. The ambulatory continuous monitoring of their wrist activity was conducted for 7 days at 1-minute intervals. The time series data were analyzed using the double-plotted chronogram, spectral analysis was performed using the fast Fourier transformation and periodogram analysis was performed as well. RESULTS The frequency of circadian rhythm abnormalities of wrist activity rhythm in elderly persons with dementia was 57.3% (47 out of 82). The abnormalities were classified into four categories: severely impaired circadian rhythm type with no boundary between day and night, free-running rhythm type, decreased circadian amplitude type, and accentuation of ultradian rhythm type. CONCLUSION This four-category classification system provides a scientific approach for studying the mechanisms of circadian activity rhythm abnormalities of elderly persons with dementia.
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Affiliation(s)
- Y Motohashi
- Department of Public Health, Akita University School of Medicine, Akita City, Japan.
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Yamashita A, Ishida K, Aratake K, Wakamatsu H, Kawata R, Kunihiro M, Sakabe T. [Perioperative management of endovascular stent graft placement for abdominal aortic aneurysm]. Masui 2000; 49:987-94. [PMID: 11025953] [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: 02/17/2023]
Abstract
We retrospectively examined the changes in hemodynamics, oxygen index and renal function along with the complications in 25 patients who had undergone endovascular stent graft placement (ESG) surgery for abdominal aortic aneurysm. During stent graft placement, mean arterial pressure decreased to 58 +/- 8 mmHg by increasing the dose of anesthetics and/or using vasodilators. Except for this intended hypotensive period, mean arterial pressure and heart rate were relatively stable and adequately maintained during surgical manipulation. Oxygenation index was well maintained. A patient with a high preoperative creatinine level underwent prophylactic hemodialysis postoperatively. In other patients except one who died in early postoperative period, both BUN and creatinine levels were kept within normal ranges. Four patients died postoperatively and the causes of the death in two patients are related to the surgical procedure; one with multiple emboli possibly due to released atheloma from the aortic wall during procedure, the other with sepsis due to infected stent graft. Although ESG is a well tolerated procedure, embolism is the most serious complication. Careful preoperative evaluation of the ascending arch and descending aortic wall and monitoring with transcranial doppler are necessary.
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Affiliation(s)
- A Yamashita
- Department of Anesthesiology-Resuscitology, Yamaguchi University School of Medicine, Ube
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