Updated on 2025/12/18

写真a

 
Kasai Shigenobu
 
Organization
- - Professor
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Research Interests

  • ROS (Reactive Oxygen Species)

  • サイトカインアッセイ

  • インピーダンス計測

  • 細胞機能計測用デバイス

  • バイオ素子

  • 呼吸バースト評価

  • SECM(走査型電気化学顕微鏡)

Research Areas

  • Nanotechnology/Materials / Green sustainable chemistry and environmental chemistry

  • Life Science / Pharmaceutical hygiene and biochemistry

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Biofunction and bioprocess engineering

Research History

  • 東北工業大学大学院 工学研究科電子工学専攻

    2018.4

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  • Tohoku Institute of Technology   Professor

    2010.4 - 2018.3

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  • Tohoku Institute of Technology   Associate Professor

    2007

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Professional Memberships

  • THE ELECTROCHEMICAL SOCIETY OF JAPAN

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  • JAPANESE SOCIETY FOR MEDICAL AND BIOLOGICAL ENGINEERING

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  • JAPANESE ASSOCIATION FOR ANIMAL CELL TECHNOLOGY

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  • THE CHEMICAL SOCIETY OF JAPAN

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Committee Memberships

  • 日本ポーラログラフ学会   評議員  

    2020.4 - 2025.3   

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  • 公益社団法人電気化学会 東北支部   幹事  

    2018.4   

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  • 公益社団法人電気化学会   理事  

    2018.4 - 2020.3   

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  • 電気化学会   代議員  

    2012.4 - 2017.3   

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    Committee type:Academic society

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  • 日本生体医工学会   ME技術教育委員  

    2011.4   

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    Committee type:Academic society

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Job Achievement

  • 入試部委員会 次長(副委員長)

    2012.4 - 2016.3

  • 環境情報工学専攻 専攻長

    2011.4 - 2017.3

  • 学生部委員会 次長(副委員長)

    2009.4 - 2012.3

Papers

  • Scanning Electrochemical Microscopy-Somatic Cell Count as a Method for Diagnosis of Bovine Mastitis Reviewed

    Shigenobu Kasai, Ankush Prasad, Ryoma Kumagai, Keita Takanohashi

    Biology   11 ( 4 )   549   2022.4

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The method to diagnose mastitis is generally the somatic cell count (SCC) by flow cytometry measurement. When the number of somatic cells in raw milk is 2.0 × 105 cells/mL or more, the condition is referred to as mastitis. In the current study, we created a milk cell chip that serves as an electrochemical method that can be easily produced and used utilizing scanning electrochemical microscopy (SECM). The microelectrode present in the cell chip scans, and the difference between the oxygen concentration near the milk cell chip and in bulk is measured as the oxygen (O2) reduction current. We estimated the relationship between respiratory activity and the number of somatic cells in raw milk as a calibration curve, using scanning electrochemical microscopy-somatic cell count (SECM-SCC). As a result, a clear correlation was shown in the range of 104 cells/mL to 106 cells/mL. The respiration rate (F) was estimated to be about 10–16 mol/s per somatic cell. We also followed the increase in oxygen consumption during the respiratory burst using differentiation inducer phorbol 12-myristate 13-acetate (PMA) as an early stage of mastitis, accompanied with an increase in immune cells, which showed similar results. In addition, we were able to discriminate between cattle with mastitis and without mastitis.

    DOI: 10.3390/biology11040549

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  • Reactive Oxygen Species Imaging in U937 Cells Reviewed

    Ankush Prasad, Michaela Sedlářová, Anastasiia Balukova, Alina Ovsii, Marek Rác, Michal Křupka, Shigenobu Kasai, Pavel Pospíšil

    Frontiers in Physiology   11   2020.10

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    Publishing type:Research paper (scientific journal)   Publisher:Frontiers Media SA  

    DOI: 10.3389/fphys.2020.552569

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  • Real-time imaging of photosynthetic oxygen evolution from spinach using LSI-based biosensor Reviewed International journal

    Shigenobu Kasai, Yamato Sugiura, Ankush Prasad, Kumi Y. Inoue, Teruya Sato, Tomohiro Honmo, Aditya Kumar, Pavel Pospíšil, Kosuke Ino, Yuka Hashi, Yoko Furubayashi, Masahki Matsudaira, Atsushi Suda, Ryota Kunikata, Tomokazu Matsue

    Scientific Reports   9 ( 1 )   12234 - 12234   2019.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    The light-driven splitting of water to oxygen (O2) is catalyzed by a protein-bound tetra-manganese penta-oxygen calcium (Mn4O5Ca) cluster in Photosystem II. In the current study, we used a large-scale integration (LSI)-based amperometric sensor array system, designated Bio-LSI, to perform two-dimensional imaging of light-induced O2 evolution from spinach leaves. The employed Bio-LSI chip consists of 400 sensor electrodes with a pitch of 250 μm for fast electrochemical imaging. Spinach leaves were illuminated to varying intensities of white light (400-700 nm) which induced oxygen evolution and subsequent electrochemical images were collected using the Bio-LSI chip. Bio-LSI images clearly showed the dose-dependent effects of the light-induced oxygen release from spinach leaves which was then significantly suppressed in the presence of urea-type herbicide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU). Our results clearly suggest that light-induced oxygen evolution can be monitored using the chip and suggesting that the Bio-LSI is a promising tool for real-time imaging. To the best of our knowledge, this report is the first to describe electrochemical imaging of light-induced O2 evolution using LSI-based amperometric sensors in plants.

    DOI: 10.1038/s41598-019-48561-y

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    Other Link: http://www.nature.com/articles/s41598-019-48561-y

  • 鉄ポルフィリン修飾電極を用いたデュアル型O2−•/NOセンサの構築 Reviewed

    松岡 涼, 小林 ちひろ, 黒澤 覚久, 鈴木 美咲, 中山 映里, 髙橋 明美, 青柳 重夫, 相川 達男, 近藤 剛史, 葛西 重信, 湯浅 真

    BUNSEKI KAGAKU   67 ( 9 )   511 - 517   2018.9

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  • A Reactive Oxygen/Nitrogen Species Sensor Fabricated from an Electrode Modified with a Polymerized Iron Porphyrin and a Polymer Electrolyte Membrane Reviewed

    R. Matsuoka, C. KobayashiI, A. Nakagawa, S.Aoyagi, T. Aikawa, T. Kondo, S.Kasai, M.Yuasa

    Analytical Sciences   33 ( 8 )   911 - 915   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society for Analytical Chemistry  

    We have developed an electrochemical reactive oxygen/nitrogen species sensor that can detect superoxide anion radicals (O<sub>2</sub><sup>&minus;&bull;</sup>) and nitric oxide (NO). The reactive oxygen/nitrogen species sensor was fabricated by surface modification of an electrode with polymerized iron tetrakis(3-thienyl)porphyrin (FeT3ThP), and it can detect either O<sub>2</sub><sup>&minus;&bull;</sup> or NO by switching the applied potential. Furthermore, we fabricated a sensor with improved selectivity by coating a Nafion<sup>&reg;</sup> film onto the poly(FeT3ThP)-modified electrode. An interference current caused by NO<sub>2</sub><sup>&minus;</sup> was seen for the poly(FeT3ThP)-modified electrode, while the interference current was significantly reduced at the Nafion<sup>&reg;</sup>/poly(FeT3ThP)-modified electrode, leading to improved selectivity for NO detection. The current response at the Nafion<sup>&reg;</sup>/poly(FeT3ThP)-modified electrode exhibited good linearity in the O<sub>2</sub><sup>&minus;&bull;</sup> and NO concentration ranges 1.3 &ndash; 4.1, and 0.5 &ndash; 10 &mu;M, respectively. The Nafion<sup>&reg;</sup>/poly(FeT3ThP)-modified and poly(FeT3ThP)-modified electrodes are highly versatile, because these electrodes can detect either O<sub>2</sub><sup>&minus;&bull;</sup> or NO by switching the applied potential. Since the Nafion<sup>&reg;</sup>/poly(FeT3ThP)-modified and poly(FeT3ThP)-modified electrodes contain no bio-derived compounds, the reactive oxygen/nitrogen species sensor should be safe even when it is used <i>in vivo</i>.

    DOI: 10.2116/analsci.33.911

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  • Real-time monitoring of superoxide anion radical generation in response to wounding: electrochemical study Reviewed

    Ankush Prasad, Aditya Kumar, Ryo Matsuoka, Akemi Takahashi, Ryo Fujii, Yamato Sugiura, Hiroyuki Kikuchi, Shigeo Aoyagi, Tatsuo Aikawa, Takeshi Kondo, Makoto Yuasa, Pavel Pospíšil, Shigenobu Kasai

    PeerJ   5   e3050 - e3050   2017.7

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    Publishing type:Research paper (scientific journal)   Publisher:PeerJ  

    <sec>
    <title>Background</title>
    The growth and development of plants is deleteriously affected by various biotic and abiotic stress factors. Wounding in plants is caused by exposure to environmental stress, mechanical stress, and via herbivory. Typically, oxidative burst in response to wounding is associated with the formation of reactive oxygen species, such as the superoxide anion radical (O<sub>2</sub><sup>•−</sup>), hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and singlet oxygen; however, few experimental studies have provided direct evidence of their detection in plants. Detection of O<sub>2</sub><sup>•−</sup> formation in plant tissues have been performed using various techniques including electron paramagnetic resonance spin-trap spectroscopy, epinephrine-adrenochrome acceptor methods, staining with dyes such as tetrazolium dye and nitro blue tetrazolium (NBT); however, kinetic measurements have not been performed. In the current study, we provide evidence of O<sub>2</sub><sup>•−</sup> generation and its kinetics in the leaves of spinach (<italic>Spinacia oleracea</italic>) subjected to wounding.


    </sec>
    <sec>
    <title>Methods</title>
    Real-time monitoring of O<sub>2</sub><sup>•−</sup> generation was performed using catalytic amperometry. Changes in oxidation current for O<sub>2</sub><sup>•−</sup> was monitored using polymeric iron-porphyrin-based modified carbon electrodes (<italic>φ</italic> = 1 mm) as working electrode with Ag/AgCl as the reference electrode.


    </sec>
    <sec>
    <title>Result</title>
    The results obtained show continuous generation of O<sub>2</sub><sup>•−</sup> for minutes after wounding, followed by a decline. The exogenous addition of superoxide dismutase, which is known to dismutate O<sub>2</sub><sup>•−</sup> to H<sub>2</sub>O<sub>2</sub>, significantly suppressed the oxidation current.


    </sec>
    <sec>
    <title>Conclusion</title>
    Catalytic amperometric measurements were performed using polymeric iron-porphyrin based modified carbon electrode. We claim it to be a useful tool and a direct method for real-time monitoring and precise detection of O<sub>2</sub><sup>•−</sup> in biological samples, with the potential for wide application in plant research for specific and sensitive detection of O<sub>2</sub><sup>•−</sup>.


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    DOI: 10.7717/peerj.3050

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    Other Link: https://peerj.com/articles/3050.xml

  • Scanning Electrochemical Microscopy Imaging during Respiratory Burst in Human Cell Reviewed

    Hiroyuki Kikuchi, Ankush Prasad, Ryo Matsuoka, Shigeo Aoyagi, Tomokazu Matsue, Shigenobu Kasai

    FRONTIERS IN PHYSIOLOGY   7   25   2016.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/fphys.2016.00025

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  • バイオLSIを用いた光合成活性イメージング

    杉浦 大和, 橋 由佳, 井上 久美, 伊野 浩介, 末永 智一, 葛西 重信

    電気関係学会東北支部連合大会講演論文集   2016   38 - 38   2016

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    Language:Japanese   Publisher:電気関係学会東北支部連合大会実行委員会  

    DOI: 10.11528/tsjc.2016.0_38

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  • Simultaneous Real-Time Monitoring of Oxygen Consumption and Hydrogen Peroxide Production in Cells Using Our Newly Developed Chip-Type Biosensor Device Reviewed

    Ankush Prasad, Hiroyuki Kikuchi, Kumi Y.Inoue, Makoto Suzuki, Yamato Sugiura, Tomoya Sugai, Amano Tomonori, Mika Tada, Masaki Kobayashi, Tomokazu Matsue, Shigenobu Kasai

    Frontiers in Physiology   7 ( 25 )   2016

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/fphys.2016.00109

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  • Detection of hydrogen peroxide in Photosystem II (PSII) using catalytic amperometric biosensor Reviewed

    Ankush Prasad, Aditya Kumar, Makoto Suzuki, Hiroyuki Kikuchi, Tomoya Sugai, Masaki Kobayashi, Pavel Pospisil, Mika Tada, Shigenobu Kasai

    FRONTIERS IN PLANT SCIENCE   6   862   2015.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3389/fpls.2015.00862

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  • Generation mechanism of radical species by tyrosine-tyrosinase reaction Reviewed

    Mika Tada, Masahiro Kohno, Shigenobu Kasai, Yoshimi Niwano

    Journal of Clinical Biochemistry and Nutrition   47 ( 2 )   162 - 166   2010.9

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    DOI: 10.3164/jcbn.10-48

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  • Electrochemical monitoring of hydrogen peroxide released from leucocytes on horseradish peroxidase redox polymer coated electrode chip Reviewed

    Kumi Y. Inoue, Kosuke Ino, Hitoshi Shiku, Shigenobu Kasai, Tomoyuki Yasukawa, Fumio Mizutani, Tomokazu Matsue

    Biosensors and Bioelectronics   25 ( 7 )   1723 - 1728   2010.3

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    DOI: 10.1016/j.bios.2009.12.014

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  • Maternal vitamin B12deficiency affects spermatogenesis at the embryonic and immature stages in rats Reviewed

    Toshiaki Watanabe, Shuhei Ebara, Sachiko Kimura, Kunihiko Maeda, Yoshitaka Watanabe, Hiroshi Watanabe, Shigenobu Kasai, Yoshihisa Nakano

    Congenital Anomalies   47 ( 1 )   9 - 15   2007.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/j.1741-4520.2006.00135.x

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  • Electrochemical monitoring of cellular signal transduction with a secreted alkaline phosphatase reporter system Reviewed

    Yu Suke Torisawa, Noriko Ohara, Kuniaki Nagamine, Shigenobu Kasai, Tomoyuki Yasukawa, Hitoshi Shiku, Tomokazu Matsue

    Analytical Chemistry   78 ( 22 )   7625 - 7631   2006.11

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    DOI: 10.1021/ac060737s

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  • Cytokine assay on a cellular chip by combining collagen gel embedded culture with scanning electrochemical microscopy Reviewed

    S Kasai, H Shiku, YS Torisawa, K Nagamine, T Yasukawa, T Watanabe, T Matsue

    ANALYTICA CHIMICA ACTA   566 ( 1 )   55 - 59   2006.4

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    DOI: 10.1016/j.aca.2006.02.061

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  • Real-time monitoring of reactive oxygen species production during differentiation of human monocytic cell lines (THP-1) Reviewed

    S Kasai, H Shiku, YS Torisawa, H Noda, J Yoshitake, T Shiraishi, T Yasukawa, T Watanabe, T Matsue, T Yoshimura

    ANALYTICA CHIMICA ACTA   549 ( 1-2 )   14 - 19   2005.9

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    DOI: 10.1016/j.aca.2005.06.034

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  • NAD(P)H oxidase plays a crucial role in PDGF-induced proliferation of hepatic stellate cells Reviewed

    Tohru Adachi, Hitoshi Togashi, Akihiko Suzuki, Shigenobu Kasai, Junitsu Ito, Kazuhiko Sugahara, Sumio Kawata

    Hepatology   41 ( 6 )   1272 - 1281   2005.6

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/hep.20719

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  • Respiration activity of single bovine embryos entrapped in a cone-shaped microwell monitored by scanning electrochemical microscopy Reviewed

    Hitoshi Shiku, Takuo Shiraishi, Shigeo Aoyagi, Yousuke Utsumi, Masahki Matsudaira, Hiroyuki Abe, Hiroyoshi Hoshi, Shigenobu Kasai, Hiroaki Ohya, Tomokazu Matsue

    Analytica Chimica Acta   522 ( 1 )   51 - 58   2004.9

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.aca.2004.06.054

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  • Proliferation assay on a silicon chip applicable for tumors extirpated from mammalians Reviewed

    Yusuke Torisawa, Hioshi Shiku, Shigenobu Kasai, Matsuhiko Nishizawa, Tomokazu Matsue

    International Journal of Cancer   109   302 - 308   2004.1

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    DOI: 10.1002/ijc.11693

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  • Characterization of the Peroxidase Activity of Single Algae Protoplasts by Scanning Electrochemical Microscopy Reviewed

    Huafang Zhou, Shigenobu Kasai, Hiroyuki Noda, Hiroaki Ohya-Nishiguchi, Hitoshi Shiku, Tomokazu Matsue

    Bulletin of the Chemical Society of Japan   76 ( 9 )   1757 - 1762   2003.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Chemical Society of Japan  

    DOI: 10.1246/bcsj.76.1757

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    Other Link: http://hdl.handle.net/10097/51672

  • Simultaneous detection of uric acid and glucose on a dual-enzyme chip using scanning electrochemical microscopy/scanning chemiluminescence microscopy Reviewed

    S Kasai, Y Hirano, N Motochi, H Shiku, M Nishizawa, T Matsue

    ANALYTICA CHIMICA ACTA   458 ( 2 )   263 - 270   2002.5

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    DOI: 10.1016/S0003-2670(02)00064-8

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  • Mapping peroxidase in plant tissues by scanning electrochemical microscopy Reviewed

    Huafang Zhou, Hitoshi Shiku, Shigenobu Kasai, Hiroyuki Noda, Tomokazu Matsue, Hiroaki Ohya-Nishiguchi, Hitoshi Kamada

    Bioelectrochemistry   54   151 - 156   2001.8

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  • Imaging localized horseradish peroxidase on a glass surface with scanning electrochemical/chemiluminescence microscopy Reviewed

    HF Zhou, S Kasai, T Matsue

    ANALYTICAL BIOCHEMISTRY   290 ( 1 )   83 - 88   2001.3

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    DOI: 10.1006/abio.2000.4941

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  • Immunoassay of the MRSA-related toxic protein, leukocidin, with scanning electrochemical microscopy Reviewed

    S Kasai, A Yokota, HF Zhou, M Nishizawa, K Niwa, T Onouchi, T Matsue

    ANALYTICAL CHEMISTRY   72 ( 23 )   5761 - 5765   2000.12

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    DOI: 10.1021/ac000895y

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  • Chemiluminescence Imaging of Localized Enzymes by Scanning Chemiluminescence Microscopy Reviewed

    Shigenobu Kasai, Huafang Zhou, Tomokazu Matsue

    Chemistry Letters   29 ( 3 )   200 - 201   2000.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Chemical Society of Japan  

    A novel scanning chemiluminescence microscopy (SCLM) was used for imaging localized horse radish peroxidase (HRP) or glucose oxidase (GOD) immobilized at a solid substrate. SCLM equips a scanning capillary tip (diameter, 1 μm) for injecting a small amount of luminol onto the substrate to generate localized chemiluminescence. The chemiluminescense induced by the enzyme-catalyzed reaction was detected with a photon-counter. Two-demensional mapping of the photon-counting intensity against the tip position gave images indicating the activity of immobilized HRP and GOD.

    DOI: 10.1246/cl.2000.200

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  • Imaging the Activity of Immobilized Horse Radish Peroxidase with Scanning Electrochemical/chemiluminescence Microscopy Reviewed

    H. Zhou, S. Kasai, T. Yasukawa, T. Matsue

    Electrochemistry   67 ( 12 )   1999.6

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Research Projects

  • The environmental pollution material which assumed NO produced by a cultured cell an index and a food composition

    Grant number:17550146  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YOSHITAKE Jun, SHIGENOBU Kasai, TOMOKAZU Matsuei

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    Grant amount:\3810000 ( Direct Cost: \3600000 、 Indirect Cost:\210000 )

    Since the endocrine and immune systems share portions of some intracellular signal pathways, endocrine disrupting chemicals (EDCs) are considered potential agents for influencing inflammatory responses. Here, we investigated the effect of EDCs on lipopolysaccharide (LPS)-induced NO production and NF-κB activation in the RAW264.7 mouse macrophage cell line. Five phenol-containing EDCs were investigated, namely bisphenol A (BPA), the alkyl phenols p-n-nonylphenol (NP) and p-n-octylphenol (OP), and the chlorinated phenols 2,4-dichrolophenol (DCP) and pentachlorophenol (PCP). Our results revealed that these chemicals dose-dependently suppressed LPS-induced NO production, as reflected by decreased NOx content. The suppressive effects of BPA, NP and OP, but not PCP or DCP, were blocked by the estrogen receptor (ER) inhibitor, ICI182780. ELISA-based quantification of the DNA-binding activity of free p65 NF-κB showed that LPS-induced NF-κB activation was significantly diminished by EDC treatment. Furthermore, immunocytochemical analysis of 8-nitroguanosine, a unique index of NO-mediated signaling, showed that 8-nitroguanosine formation increased in LPS-stimulated cells, but this increase was inhibited by the tested EDCs. These results demonstrate that EDCs suppress NO production and NF-κB activation in LPS-stimulated macrophages through ER-dependent (BPA, NP, OP) and -independent (PCP, DCP) pathways. The EDCs further inhibited 8-nitroguanosine formation, suggesting that they interfere with NO-mediated signaling. Thus, EDCs might play important roles in the inflammatory response and host defense system against foreign pathogens.

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  • Physiological action of nitric oxide produced by a stimulation of endotoxin from Helicobacter pylori on gastric mucosa

    Grant number:15590087  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YOSHIMURA Tetsuhiko, KASAI Shigenobu, MORITA Hidetoshi

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    Grant amount:\3600000 ( Direct Cost: \3600000 )

    Helicobacter pylori, a gram-negative bacterium, is the primary cause of gastritis and a major contributor to peptic ulcer disease. Despite its importance as a human pathogen, principal factor of pathogenicity of the bacterium remains to be identified Nitric oxide (NO) released due to the induction of Ca^<2+> independent isoform of nitric oxide synthase (iNOS) by lipopolysaocharide or endotoxin from a gram-negative bacterium bas been known to be deleterious to a gastric mucosa. In the present shady, to elucidate the physiological action of H.pylori LPS on gastric mucosa and the role of NO, we were carried out both in vivo and in vitro study by employing E.coli LPS as a control.
    1. IT pylori LPS was isolated from gram-order bacteria by the phenol-water extraction method, and then further purified by tine enzymatic digestion of RNA, DNA, and proteins.
    2. In vitro cross talk between products from iNOS and cyclooxygenase (COX) in the rat gastric mucosa during endotoxemia was examined in vivo. The results demonstrate that in the E cob LPS-treated rat gastric mucosa, PGE2, a COX product, enhances after activation of iNOS. The effect of COX activity on iNOS-NO pathway is important in the regulation of gastric mucosal integrity inflammatory states.
    3. We further elucidated the interaction of LPS with gastric epithelial cells by using a normal mouse gastric surface mucous cell line (GSM06). Our findings suggest that both LPSs from H.pylori and E.coli induce the iNOS and Toll-like receptor (TLR) 2 through the TLR 4 expressed constitutively in GSM06. This mechanism on TLR 2 induction can be crucial for maintenance of gastric mucosal integrity.

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  • EVELOPMENT OF MICROASSEY SYSTEM TO AIM AT ENVIRONMENTAL MONITORING.

    Grant number:14550775  2002 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KASAI Shigenobu, MATSUE Tomokazu, TAKANO Hirohisa, NODA Hiroyuki

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    Grant amount:\2700000 ( Direct Cost: \2700000 )

    1).Real-time monitoring of reactive oxygen species production during differentiation of human monocytic cell lines (THP-1)
    Human monocytic leukemia cell line, THP-1, is differentiated into macrophages by phorbol myristate acetate (PMA) treatment. We report real-time monitoring of reactive oxygen species (ROSs) and cytokines production during the differentiation process. The production of ROSs by THP-1 with several hours time scale has been detected using chemiluminescence's methods.
    2)Characterization of the Peroxidase Activity and hydrogen peroxide production of cell by SECM (scanning electrochemistry microscope)
    The peroxidase activity in a single protoplast of alga Bryopsis plumosa is quantitatively characterized by scanning electrochemical microscopy. The generation of ferriceniummethanol (FMA^+) at the protoplast surface is directly detected by the microelectrode tip scanned close to the sample surface in seawater containing ferrocenemethanol (FMA) and hydrogen peroxide an electron mediator and an enzyme-substrate, respectively.
    The macrophages consume oxygen and produce ROS which become hydrogen peroxide by a dismutation reaction. The amount of hydrogen peroxide can be measured by the current obtained when the microelectrode is brought to about 〜50μm from the macrophage surface.

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Teaching Experience