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Tanaka D, Zheng S, Furuya M, Kobayashi M, Fujita H, Akitsu T, Sekiguchi T, Shoji S. Efficient Separation of Methanol Single-Micron Droplets by Tailing Phenomenon Using a PDMS Microfluidic Device. Molecules 2024; 29:1949. [PMID: 38731440 PMCID: PMC11085517 DOI: 10.3390/molecules29091949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/11/2024] [Accepted: 04/17/2024] [Indexed: 05/13/2024] Open
Abstract
Microdroplet-based fluidic systems have the advantages of small size, short diffusion time, and no cross-contamination; consequently, droplets often provide a fast and precise reaction environment as well as an analytical environment for individual molecules. In order to handle diverse reactions, we developed a method to create organic single-micron droplets (S-MDs) smaller than 5 μm in diameter dispersed in silicone oil without surfactant. The S-MD generation microflow device consists of a mother droplet (MoD) generator and a tapered separation channel featuring multiple side channels. The tapered channel enhanced the shear forces to form tails from the MoDs, causing them to break up. Surface treatment with the fluoropolymer CYTOP protected PDMS fluid devices from organic fluids. The tailing separation of methanol droplets was accomplished without the use of surfactants. The generation of tiny organic droplets may offer new insights into chemical separation and help study the scaling effects of various chemical reactions.
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Affiliation(s)
- Daiki Tanaka
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, Tokyo 145-0065, Japan; (S.Z.); (S.S.)
| | - Shengqi Zheng
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, Tokyo 145-0065, Japan; (S.Z.); (S.S.)
| | - Masahiro Furuya
- Cooperative Major in Nuclear Energy, Waseda University, Tokyo 169-8555, Japan; (M.F.); (M.K.)
| | - Masashi Kobayashi
- Cooperative Major in Nuclear Energy, Waseda University, Tokyo 169-8555, Japan; (M.F.); (M.K.)
| | | | - Takashiro Akitsu
- Department of Chemistry, Faculty of Science, Tokyo University of Science, Tokyo 162-0825, Japan;
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo 162-0041, Japan;
| | - Shuichi Shoji
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, Tokyo 145-0065, Japan; (S.Z.); (S.S.)
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2
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Muta M, Kawakubo W, Yoon DH, Tanaka D, Sekiguchi T, Shoji S, Ito M, Hatada Y, Funatsu T, Iizuka R. Deformability-Based Microfluidic Microdroplet Screening to Obtain Agarolytic Bacterial Cells. Anal Chem 2023; 95:16107-16114. [PMID: 37877901 DOI: 10.1021/acs.analchem.3c02174] [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: 10/26/2023]
Abstract
Environmental microorganisms possess enzymes that can digest macromolecules such as agarose into smaller molecules that can be utilized for growth. These enzymes could be valuable for the effective utilization of global resources. However, since most of the microorganisms on Earth remain uncultured, there is significant untapped enzymatic potential in nature. Therefore, it is necessary to develop innovative tools and strategies for exploring these enzymatic resources. To address this, we developed a method for screening microbial cells that secrete hydrogel-degrading enzymes using deformability-based microfluidic microdroplet sorting. In this method, microbial cells are encapsulated as single cells in water-in-oil (W/O) microdroplets with a hydrogel whose shape becomes deformable as the hydrogel is progressively degraded into smaller molecules. Screening is achieved using a microfluidic device that passively sorts the deformed W/O microdroplets. Using this method, we successfully sorted agarose-containing microdroplets, encapsulating single bacterial cells that hydrolyzed agarose. This method can be used to screen various hydrogel-degrading microbial cells.
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Affiliation(s)
- Mikihisa Muta
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Wataru Kawakubo
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Mei Ito
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya-shi 369-0293, Saitama, Japan
| | - Yuji Hatada
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya-shi 369-0293, Saitama, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ryo Iizuka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Tanaka D, Ishihara J, Takahashi H, Kobayashi M, Miyazaki A, Kajiya S, Fujita R, Maekawa N, Yamazaki Y, Takaya A, Nakamura Y, Furuya M, Sekiguchi T, Shoji S. High-Efficiency Single-Cell Containment Microdevices Based on Fluid Control. Micromachines (Basel) 2023; 14:mi14051027. [PMID: 37241650 DOI: 10.3390/mi14051027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
In this study, we developed a comb-shaped microfluidic device that can efficiently trap and culture a single cell (bacterium). Conventional culture devices have difficulty in trapping a single bacterium and often use a centrifuge to push the bacterium into the channel. The device developed in this study can store bacteria in almost all growth channels using the flowing fluid. In addition, chemical replacement can be performed in a few seconds, making this device suitable for culture experiments with resistant bacteria. The storage efficiency of microbeads that mimic bacteria was significantly improved from 0.2% to 84%. We used simulations to investigate the pressure loss in the growth channel. The pressure in the growth channel of the conventional device was more than 1400 PaG, whereas that of the new device was less than 400 PaG. Our microfluidic device was easily fabricated by a soft microelectromechanical systems method. The device was highly versatile and can be applied to various bacteria, such as Salmonella enterica serovar Typhimurium and Staphylococcus aureus.
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Affiliation(s)
- Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Junichi Ishihara
- Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-0856, Japan
| | - Hiroki Takahashi
- Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-0856, Japan
- Molecular Chirality Research Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
- Plant Molecular Science Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
| | - Masashi Kobayashi
- School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 169-8555, Japan
| | - Aya Miyazaki
- School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 169-8555, Japan
| | - Satsuki Kajiya
- School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 169-8555, Japan
| | - Risa Fujita
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Naoki Maekawa
- Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Yuriko Yamazaki
- Department of Dermatology, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
- Department of Dermatology, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan
- Cutaneous Allergy and Host Defense, Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan
| | - Akiko Takaya
- Medical Mycology Research Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-0856, Japan
- Plant Molecular Science Center, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan
- Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba 260-8675, Japan
| | - Yuumi Nakamura
- Department of Dermatology, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
- Cutaneous Allergy and Host Defense, Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan
| | - Masahiro Furuya
- Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Waseda Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Shuichi Shoji
- School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 169-8555, Japan
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Kobayashi M, Akitsu T, Furuya M, Sekiguchi T, Shoji S, Tanii T, Tanaka D. Efficient Synthesis of a Schiff Base Copper(II) Complex Using a Microfluidic Device. Micromachines (Basel) 2023; 14:890. [PMID: 37421123 DOI: 10.3390/mi14040890] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 07/09/2023]
Abstract
The efficient synthesis of amino acid Schiff base copper(II) complexes using a microfluidic device was successfully achieved. Schiff bases and their complexes are remarkable compounds due to their high biological activity and catalytic function. Conventionally, products are synthesized under reaction conditions of 40 °C for 4 h using a beaker-based method. However, in this paper, we propose using a microfluidic channel to enable quasi-instantaneous synthesis at room temperature (23 °C). The products were characterized using UV-Vis, FT-IR, and MS spectroscopy. The efficient generation of compounds using microfluidic channels has the potential to significantly contribute to the efficiency of drug discovery and material development due to high reactivity.
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Affiliation(s)
- Masashi Kobayashi
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Takashiro Akitsu
- Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Masahiro Furuya
- Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Takashi Tanii
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan
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Shijo S, Tanaka D, Sekiguchi T, Ishihara JI, Takahashi H, Kobayashi M, Shoji S. Dielectrophoresis-Based Selective Droplet Extraction Microfluidic Device for Single-Cell Analysis. Micromachines (Basel) 2023; 14:706. [PMID: 36985113 PMCID: PMC10058699 DOI: 10.3390/mi14030706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/18/2023] [Accepted: 03/20/2023] [Indexed: 06/18/2023]
Abstract
We developed a microfluidic device that enables selective droplet extraction from multiple droplet-trapping pockets based on dielectrophoresis. The device consists of a main microchannel, five droplet-trapping pockets with side channels, and drive electrode pairs appropriately located around the trapping pockets. Agarose droplets capable of encapsulating biological samples were successfully trapped in the trapping pockets due to the difference in flow resistance between the main and side channels. Target droplets were selectively extracted from the pockets by the dielectrophoretic force generated between the electrodes under an applied voltage of 500 V. During their extraction from the trapping pockets, the droplets and their contents were exposed to an electric field for 400-800 ms. To evaluate whether the applied voltage could potentially damage the biological samples, the growth rates of Escherichia coli cells in the droplets, with and without a voltage applied, were compared. No significant difference in the growth rate was observed. The developed device enables the screening of encapsulated single cells and the selective extraction of target droplets.
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Affiliation(s)
- Seito Shijo
- Major in Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 145-0065, Japan; (M.K.)
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku, Tokyo 162-0041, Japan
| | - Jun-ichi Ishihara
- Medical Mycology Research Center, Chiba University, 181 Inohana, Chuo, Chiba 260-8673, Japan
| | - Hiroki Takahashi
- Medical Mycology Research Center, Chiba University, 181 Inohana, Chuo, Chiba 260-8673, Japan
- Molecular Chirality Research Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
- Plant Molecular Science Center, Chiba University, 181 Inohana, Chuo, Chiba 260-8673, Japan
| | - Masashi Kobayashi
- Major in Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 145-0065, Japan; (M.K.)
| | - Shuichi Shoji
- Major in Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 145-0065, Japan; (M.K.)
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6
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Chiu PF, Mok A, Leow J, Zhang K, Chiang C, Hsieh P, Lam W, Tsang W, Chan H, Fan Y, Lin T, Hayashi T, Kamoi K, Uno H, Letran J, Zhu Y, Wang H, Chan T, Huang C, Zhu G, Wu H, Chiong E, Ng C, Shoji S. The role of systematic biopsy in the era of MRI guided prostate biopsy in a multi-centre Asian cohort. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)00347-0] [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: 02/12/2023]
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7
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Yoshimura H, Tanaka D, Furuya M, Sekiguchi T, Shoji S. Controlling Microdroplet Inner Rotation by Parallel Carrier Flow of Sesame and Silicone Oils. Micromachines (Basel) 2021; 13:9. [PMID: 35056174 PMCID: PMC8781333 DOI: 10.3390/mi13010009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/13/2021] [Accepted: 12/15/2021] [Indexed: 06/14/2023]
Abstract
We developed a method for passively controlling microdroplet rotation, including interior rotation, using a parallel flow comprising silicone and sesame oils. This device has a simple 2D structure with a straight channel and T-junctions fabricated from polydimethylsiloxane. A microdroplet that forms upstream moves into the sesame oil. Then, the largest flow velocity at the interface of the two oil layers applies a rotational force to the microdroplet. A microdroplet in the lower oil rotates clockwise while that in the upper oil rotates anti-clockwise. The rotational direction was controlled by a simple combination of sesame and silicone oils. Droplet interior flow was visualized by tracking microbeads inside the microdroplets. This study will contribute to the efficient creation of chiral molecules for pharmaceutical and materials development by controlling rotational direction and speed.
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Affiliation(s)
- Hibiki Yoshimura
- Major in Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan;
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku, Tokyo 162-0041, Japan; (D.T.); (T.S.)
| | - Masahiro Furuya
- Cooperative Major in Nuclear Energy, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan;
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumakicho, Shinjuku, Tokyo 162-0041, Japan; (D.T.); (T.S.)
| | - Shuichi Shoji
- Major in Nanoscience and Nanoengineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan;
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8
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Hirabayashi T, Yasuhara S, Shoji S, Yamaguchi A, Abe H, Ueda S, Zhu H, Kondo T, Miyauchi M. Fabrication of Hydrogen Boride Thin Film by Ion Exchange in MgB 2. Molecules 2021; 26:molecules26206212. [PMID: 34684790 PMCID: PMC8540303 DOI: 10.3390/molecules26206212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 10/04/2021] [Accepted: 10/09/2021] [Indexed: 11/16/2022] Open
Abstract
In this study, hydrogen boride films are fabricated by ion-exchange treatment on magnesium diboride (MgB2) films under ambient temperature and pressure. We prepared oriented MgB2 films on strontium titanate (SrTiO3) substrates using pulsed laser deposition (PLD). Subsequently, these films were treated with ion exchangers in acetonitrile solution. TOF-SIMS analysis evidenced that hydrogen species were introduced into the MgB2 films by using two types of ion exchangers: proton exchange resin and formic acid. According to the HAXPES analysis, negatively charged boron species were preserved in the films after the ion-exchange treatment. In addition, the FT-IR analysis suggested that B-H bonds were formed in the MgB2 films following the ion-exchange treatment. The ion-exchange treatment using formic acid was more efficient compared to the resin treatment; with respect to the amount of hydrogen species introduced into the MgB2 films. These ion-exchanged films exhibited photoinduced hydrogen release as observed in a powder sample. Based on the present study, we expect to be able to control the morphology and hydrogen content of hydrogen boride thin films by optimising the ion-exchange treatment process, which will be useful for further studies and device applications.
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Affiliation(s)
- T. Hirabayashi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan; (T.H.); (S.Y.); (S.S.); (A.Y.)
- Department of Mechanical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
| | - S. Yasuhara
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan; (T.H.); (S.Y.); (S.S.); (A.Y.)
| | - S. Shoji
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan; (T.H.); (S.Y.); (S.S.); (A.Y.)
- Department of Materials Science & Engineering, Cornell University, Ithaca, NY 14853, USA
| | - A. Yamaguchi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan; (T.H.); (S.Y.); (S.S.); (A.Y.)
| | - H. Abe
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan;
| | - S. Ueda
- Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Hyogo 679-5148, Japan;
- Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, Tsukuba 305-0047, Japan
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan
| | - H. Zhu
- Department of Mechanical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
| | - T. Kondo
- Department of Materials Science and Tsukuba Research Center for Energy Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
- Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- Correspondence: (T.K.); (M.M.)
| | - M. Miyauchi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8552, Japan; (T.H.); (S.Y.); (S.S.); (A.Y.)
- Correspondence: (T.K.); (M.M.)
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Tanaka D, Kajiya S, Shijo S, Yoon DH, Furuya M, Nozaki Y, Fujita H, Sekiguchi T, Shoji S. Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels. Molecules 2021; 26:3707. [PMID: 34204558 PMCID: PMC8235478 DOI: 10.3390/molecules26123707] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/10/2021] [Accepted: 06/14/2021] [Indexed: 11/16/2022] Open
Abstract
In recent years, research on the application of microdroplets in the fields of biotechnology and chemistry has made remarkable progress, but the technology for the stable generation of single-micrometer-scale microdroplets has not yet been established. In this paper, we developed an efficient and stable single-micrometer-scale droplet generation device based on the fragmentation of droplet tails, called "tail thread mode", that appears under moderate flow conditions. This method can efficiently encapsulate microbeads that mimic cells and chemical products in passively generated single-micrometer-scale microdroplets. The device has a simple 2D structure; a T-junction is used for droplet generation; and in the downstream, multi-branch channels are designed for droplet deformation into the tail. Several 1-2 µm droplets were successfully produced by the tail's fragmentation; this continuous splitting was induced by the branch channels. We examined a wide range of experimental conditions and found the optimal flow rate condition can be reduced to one-tenth compared to the conventional tip-streaming method. A mold was fabricated by simple soft lithography, and a polydimethylsiloxane (PDMS) device was fabricated using the mold. Based on the 15 patterns of experimental conditions and the results, the key factors for the generation of microdroplets in this device were examined. In the most efficient condition, 61.1% of the total droplets generated were smaller than 2 μm.
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Affiliation(s)
- Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan; (D.H.Y.); (Y.N.); (T.S.)
| | - Satsuki Kajiya
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 145-0065, Japan; (S.K.); (S.S.); (M.F.); (S.S.)
| | - Seito Shijo
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 145-0065, Japan; (S.K.); (S.S.); (M.F.); (S.S.)
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan; (D.H.Y.); (Y.N.); (T.S.)
| | - Masahiro Furuya
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 145-0065, Japan; (S.K.); (S.S.); (M.F.); (S.S.)
| | - Yoshito Nozaki
- Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan; (D.H.Y.); (Y.N.); (T.S.)
| | - Hiroyuki Fujita
- Canon Medical Systems Corporation, 1385 Shimoishigami, Otawara-shi, Tochigi 324-8550, Japan;
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku-ku, Tokyo 162-0041, Japan; (D.H.Y.); (Y.N.); (T.S.)
| | - Shuichi Shoji
- Department of Electronic and Physical Systems, School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shin-juku-ku, Tokyo 145-0065, Japan; (S.K.); (S.S.); (M.F.); (S.S.)
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Kawamura M, Kuwae H, Kamibayashi T, Oshima J, Kasahara T, Shoji S, Mizuno J. Liquid/solution-based microfluidic quantum dots light-emitting diodes for high-colour-purity light emission. Sci Rep 2020; 10:14528. [PMID: 32883974 PMCID: PMC7471114 DOI: 10.1038/s41598-020-70838-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 02/20/2020] [Accepted: 07/10/2020] [Indexed: 11/20/2022] Open
Abstract
Organic light-emitting diodes (OLEDs) using a liquid organic semiconductor (LOS) are expected to provide extremely flexible displays. Recently, microfluidic OLEDs were developed to integrate and control a LOS in a device combined with microfluidic technology. However, LOS-based OLEDs show poor-colour-purity light emissions owing to their wide full width at half maximum (FWHM). Here we report liquid/solution-based microfluidic quantum dots light-emitting diodes (QLEDs) for high-colour-purity light emission. Microfluidic QLEDs contain liquid materials of LOS for a backlight and QDs solutions as luminophores. The microfluidic QLED exhibits red, green, and blue light emissions and achieves the highest light colour purity ever reported among LOS-based devices for green and red lights with narrow FWHMs of 26.2 nm and 25.0 nm, respectively. Additionally, the effect of the channel depth for the luminophore on the peak wavelength and FWHM is revealed. The developed device extends the capabilities of flexible microfluidic OLEDs-based and QDs-based displays.
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Affiliation(s)
- Masahiro Kawamura
- Department of Electronic and Physical Systems, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Hiroyuki Kuwae
- Department of Electronic and Physical Systems, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan. .,Research Organization for Nano and Life Innovation, Waseda University, 513 Waseda Tsurumaki, Shinjuku, Tokyo, 162-0041, Japan.
| | - Takumi Kamibayashi
- Department of Electronic and Physical Systems, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Juro Oshima
- Frontier Materials Research Department, Materials Research Laboratories, Nissan Chemical Corporation, Suzumi, Funabashi, Chiba, 274-0052, Japan
| | - Takashi Kasahara
- Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, Hosei University, Koganei, Tokyo, 184-8584, Japan
| | - Shuichi Shoji
- Department of Electronic and Physical Systems, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Jun Mizuno
- Research Organization for Nano and Life Innovation, Waseda University, 513 Waseda Tsurumaki, Shinjuku, Tokyo, 162-0041, Japan.,Organization for Regional Collaborative Research and Development, Tokyo University of Science, Suwa, Toyohira, Chino, Nagano, 391-0292, Japan
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11
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Tanaka D, Sawai S, Hattori S, Nozaki Y, Yoon DH, Fujita H, Sekiguchi T, Akitsu T, Shoji S. Microdroplet synthesis of azo compounds with simple microfluidics-based pH control. RSC Adv 2020; 10:38900-38905. [PMID: 35518427 PMCID: PMC9057350 DOI: 10.1039/d0ra06344d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 07/21/2020] [Accepted: 10/15/2020] [Indexed: 01/29/2023] Open
Abstract
Conventional solution-phase synthesis of azo compounds is complicated by the need for precise pH and temperature control, high concentrations of pH control reagents, and by-product removal. In this work, we exploited the advantages of microdroplet chemistry to realize the simple and highly efficient synthesis of an azo compound using microfluidics-based pH control. Owing to the small size of microdroplets, heat exchange between a microdroplet and its environment is extremely fast. Furthermore, chemical reactions in microdroplets occur rapidly due to the short diffusion distance and vortex flow. Formation of the azo compound reached completion in less than 3 s at room temperature, compared with 1 h at 0 °C under conventional conditions. pH control was simple, and the pH control reagent concentration could be reduced to less than one-tenth of that used in the conventional method. No by-products were generated, and thus this procedure did not require a recrystallization step. The time course of the chemical reaction was elucidated by observing the growth of azo compound microcrystals in droplets at various locations along the channel corresponding to different mixing times. Conventional solution-phase synthesis of azo compounds is complicated by the need for precise pH and temperature control, high concentrations of pH control reagents, and by-product removal. The microdroplet synthesis method has solved these problems.![]()
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Affiliation(s)
- Daiki Tanaka
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Shunsuke Sawai
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
| | - Shohei Hattori
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
| | - Yoshito Nozaki
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | | | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Takashiro Akitsu
- Department of Chemistry
- Faculty of Science
- Tokyo University of Science
- Tokyo 162-8601
- Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
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12
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Watanabe S, Matsumoto N, Koshio J, Ishida A, Tanaka T, Abe T, Ishikawa D, Shoji S, Nozaki K, Ichikawa K, Kondo R, Otsubo A, Aoki A, Kajiwara T, Koyama K, Miura S, Yoshizawa H, Kikuchi T. MA21.05 Phase II Trial of the Combination of Alectinib with Bevacizumab in ALK-Positive Nonsquamous Non-Small Cell Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.676] [Citation(s) in RCA: 4] [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: 11/17/2022]
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13
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Shoji S, Sawano M, Shiraishi Y, Ikemura N, Noma S, Suzuki M, Numasawa Y, Fukuda K, Kohsaka S. P6531Evidence-practice gap in the preprocedural risk assessment for contrast-induced acute kidney injury. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.1121] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Contrast-induced acute kidney injury (CI-AKI) is one of the frequently encountered and costly complications after percutaneous coronary intervention (PCI). Clinical practice guidelines strongly recommend that PCI patients should universally undergo preprocedural assessment for the risk of CI-AKI, and the contrast volume (CV) should be minimized to an achievable level, particularly among the high AKI risk patients. However, data on the CV use based on the comprehensive preprocedural risk assessment is still lacking.
Purpose
Our study aimed to 1) assess the impact of CV increase with the incidence of AKI among high AKI risk patients, and 2) retrospectively evaluate the used CV based on the preprocedural comprehensive risk assessment for patients undergoing PCI within multicenter longitudinal registry.
Methods
Between 2009 and 2018, 22,373 patients underwent PCI in 14 participating facilities, and consecutive patient data was registered. AKI was defined as a >0.3mg/dl absolute or >1.5-fold relative increase in post-PCI creatinine or new initiation of dialysis, based on the Acute Kidney Injury Network criteria. The post-procedural creatinine was defined as the highest value within 30 days after the indexed procedure. Congruent with the National Cardiovascular Data Registry (NCDR) definition, if more than 1 post-procedural creatinine level was measured, the highest value was used for determining AKI. We divided the patients into four groups according to quartile of NCDR AKI risk scores.
Results
Mean age of the patients were 68.7±11.1 years, and 79.1% were male. Mean CV use was 161.4±74.8ml. The incidence of CI-AKI was 8.9%, and was particularly high among high AKI risk patients (21.1%); CV (per 1ml linear increase) was directly associated with the occurrence of AKI (OR: 1.002 per unit in CV; 95% CI: 1.001–1.003; P<0.001) in these patients. CV during PCI decreased with the progression of chronic kidney disease (CKD), but it did not alter by the overall NCDR AKI risk score (Figure). After multivariable adjustment, CV was predicted by stage of CKD (−13.68ml; 95% CI: −12.05 to −15.30ml; P<0.001), but not by the value of pre-procedure prediction score (NCDR AKI risk score, P=0.575).
CV according to CKD/NCDR AKI risk score
Conclusions
Higher CV was directly associated with the occurrence of AKI among higher AKI risk patients. However, CV use was largely influenced by the stage of renal disease, and not with overall patient risk presented by contemporary risk scores. Our results have identified an important evidence-practice gap and emphasizes the importance of total preprocedural assessment to minimize CV and prevent subsequent AKI.
Acknowledgement/Funding
KAKENHI (16KK0186, 16H05215, 25460630, 25460777), Bayer, Daiichi Sankyo, Bristol-Myers Squibb, Teikoku Seiyaku, Sumitomo Dainippon, AstraZeneka, Pfizer
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Affiliation(s)
- S Shoji
- Keio University School of Medicine, Cardiology, Tokyo, Japan
| | - M Sawano
- Keio University School of Medicine, Cardiology, Tokyo, Japan
| | - Y Shiraishi
- Keio University School of Medicine, Cardiology, Tokyo, Japan
| | - N Ikemura
- Keio University School of Medicine, Cardiology, Tokyo, Japan
| | - S Noma
- Saiseikai Utsunomiya Hospital, Cardiology, Tochigi, Japan
| | - M Suzuki
- National Hospital Organization Saitama National Hospital, Cardiology, Saitama, Japan
| | - Y Numasawa
- Japanese Red Cross Ashikaga Hospital, Cardiology, Tochigi, Japan
| | - K Fukuda
- Keio University School of Medicine, Cardiology, Tokyo, Japan
| | - S Kohsaka
- Keio University School of Medicine, Cardiology, Tokyo, Japan
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14
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Yoon DH, Nozaki Y, Tanaka D, Sekiguchi T, Shoji S. Integration of Horizontal and Vertical Microfluidic Modules for Core-Shell Droplet Generation and Chemical Application. Micromachines (Basel) 2019; 10:E613. [PMID: 31540177 PMCID: PMC6780611 DOI: 10.3390/mi10090613] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/13/2019] [Accepted: 09/13/2019] [Indexed: 12/25/2022]
Abstract
This paper presents a method for utilizing three-dimensional microfluidic channels fully to realize multiple functions in a single device. The final device structure was achieved by combining three independent modules that consisted of horizontal and vertical channels. The device allowed for the one-step generation of water-in-oil-in-water droplets without the need for partial treatment of the polydimethylsiloxane channel surface using separate modules for generating water-in-oil droplets on the horizontal plane and oil-in-water droplets on the vertical plane. The second vertically structured module provided an efficient flow for the generation of highly wettable liquid droplets, and tuning of the first horizontally structured module enabled different modes of inner-core encapsulation within the oil shell. The successful integration of the vertical and horizontal channels for core-shell droplet generation and the chemical synthesis of a metal complex within the droplets were evaluated. The proposed approach of integrating independent modules will expand and enhance the functions of microfluidic platforms.
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Affiliation(s)
- Dong Hyun Yoon
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Yoshito Nozaki
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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15
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Yoon DH, Tanaka D, Sekiguchi T, Shoji S. Size-Dependent and Property-Independent Passive Microdroplet Sorting by Droplet Transfer on Dot Rails. Micromachines (Basel) 2018; 9:E513. [PMID: 30424446 PMCID: PMC6215178 DOI: 10.3390/mi9100513] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 10/09/2018] [Accepted: 10/09/2018] [Indexed: 11/16/2022]
Abstract
A fully passive microdroplet sorting method is presented in this paper. On the rails with dot patterns, the droplets were sorted in different ways depending on their size. However, the effect of droplet properties on the threshold size of the sorting was eliminated. The droplet positions on two railways and the Laplace pressure of the droplets on the dot patterns allowed selective droplet transfer according to size. Different gaps between the rails altered the threshold size of the transfer. However, the threshold size was independent of the droplet's surface tension and viscosity because the droplet transfer utilized only the droplet position and Laplace pressure without lateral flow to sort targets. This feature has a high potential for bio/chemical applications requiring categorization of droplet targets consisting of various mixtures as pre- or post-elements.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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16
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Masubuchi T, Endo M, Iizuka R, Iguchi A, Yoon DH, Sekiguchi T, Qi H, Iinuma R, Miyazono Y, Shoji S, Funatsu T, Sugiyama H, Harada Y, Ueda T, Tadakuma H. Construction of integrated gene logic-chip. Nat Nanotechnol 2018; 13:933-940. [PMID: 30038365 DOI: 10.1038/s41565-018-0202-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 06/14/2018] [Indexed: 06/08/2023]
Abstract
In synthetic biology, the control of gene expression requires a multistep processing of biological signals. The key steps are sensing the environment, computing information and outputting products1. To achieve such functions, the laborious, combinational networking of enzymes and substrate-genes is required, and to resolve problems, sophisticated design automation tools have been introduced2. However, the complexity of genetic circuits remains low because it is difficult to completely avoid crosstalk between the circuits. Here, we have made an orthogonal self-contained device by integrating an actuator and sensors onto a DNA origami-based nanochip that contains an enzyme, T7 RNA polymerase (RNAP) and multiple target-gene substrates. This gene nanochip orthogonally transcribes its own genes, and the nano-layout ability of DNA origami allows us to rationally design gene expression levels by controlling the intermolecular distances between the enzyme and the target genes. We further integrated reprogrammable logic gates so that the nanochip responds to water-in-oil droplets and computes their small RNA (miRNA) profiles, which demonstrates that the nanochip can function as a gene logic-chip. Our approach to component integration on a nanochip may provide a basis for large-scale, integrated genetic circuits.
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Affiliation(s)
- Takeya Masubuchi
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan
- Institute for Quantitative Biosciences, The University of Tokyo, Tokyo, Japan
| | - Masayuki Endo
- Graduate School of Science, Department of Chemistry, Kyoto University, Kyoto, Japan.
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan.
| | - Ryo Iizuka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Ayaka Iguchi
- Department of Nanoscience and Nanoengineering (ASE Graduate School), Waseda University, Tokyo, Japan
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
| | - Hao Qi
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan
- Department of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - Ryosuke Iinuma
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan
| | - Yuya Miyazono
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan
| | - Shuichi Shoji
- Department of Nanoscience and Nanoengineering (ASE Graduate School), Waseda University, Tokyo, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Hiroshi Sugiyama
- Graduate School of Science, Department of Chemistry, Kyoto University, Kyoto, Japan.
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan.
| | - Yoshie Harada
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan
- Institute for Protein Research, Osaka University, Osaka, Japan
| | - Takuya Ueda
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan.
| | - Hisashi Tadakuma
- Graduate School of Frontier Science, The University of Tokyo, Chiba, Japan.
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan.
- Institute for Protein Research, Osaka University, Osaka, Japan.
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17
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Yoon DH, Tanaka D, Sekiguchi T, Shoji S. Structural Formation of Oil-in-Water (O/W) and Water-in-Oil-in-Water (W/O/W) Droplets in PDMS Device Using Protrusion Channel without Hydrophilic Surface Treatment. Micromachines (Basel) 2018; 9:E468. [PMID: 30424401 PMCID: PMC6187530 DOI: 10.3390/mi9090468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 09/07/2018] [Accepted: 09/12/2018] [Indexed: 11/18/2022]
Abstract
This paper presents a simple method of droplet formation using liquids that easily wet polydimethylsiloxane (PDMS) surfaces without any surface treatment. Using only structural features and uniform flow focusing, Oil-in-Water (O/W) and Water-in-Oil-in-Water (W/O/W) droplets were formed in the full PDMS structure. Extrusion channel and three-dimensional flow focusing resulted in effective fluidic conditions for droplet formation and the droplet size could be precisely controlled by controlling the flow rate of each phase. The proposed structure can be utilized as an important element for droplet based research, as well as a droplet generator.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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18
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Sakamoto K, Kuwae H, Kobayashi N, Nobori A, Shoji S, Mizuno J. Highly flexible transparent electrodes based on mesh-patterned rigid indium tin oxide. Sci Rep 2018; 8:2825. [PMID: 29434296 PMCID: PMC5809474 DOI: 10.1038/s41598-018-20978-x] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [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: 11/15/2017] [Accepted: 01/24/2018] [Indexed: 11/18/2022] Open
Abstract
We developed highly bendable transparent indium tin oxide (ITO) electrodes with a mesh pattern for use in flexible electronic devices. The mesh patterns lowered tensile stress and hindered propagation of cracks. Simulations using the finite element method confirmed that the mesh patterns decreased tensile stress by over 10% because of the escaped strain to the flexible film when the electrodes were bent. The proposed patterned ITO electrodes were simply fabricated by photolithography and wet etching. The resistance increase ratio of a mesh-patterned ITO electrode after bending 1000 times was at least two orders of magnitude lower than that of a planar ITO electrode. In addition, crack propagation was stopped by the mesh pattern of the patterned ITO electrode. A mesh-patterned ITO electrode was used in a liquid-based organic light-emitting diode (OLED). The OLED displayed the same current density-voltage-luminance (J-V-L) curves before and after bending 100 times. These results indicate that the developed mesh-patterned ITO electrodes are attractive for use in flexible electronic devices.
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Affiliation(s)
- Kosuke Sakamoto
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Hiroyuki Kuwae
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Naofumi Kobayashi
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Atsuki Nobori
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Jun Mizuno
- Research Organization for Nano and Life Innovation, Waseda University, 513 Waseda Tsurumaki-cho, Shinjuku, Tokyo, 162-0041, Japan.
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Watanabe S, Tanaka H, Nozaki K, Sato M, Arita M, Mishina Y, Shoji S, Ichikawa K, Kondo R, Sakagami T, Koya T, Kikuchi T. P2.07-007 Retrospective Analysis of Antitumor Effects and Biomarkers of Nivolumab in NSCLC Patients with EGFR Mutations. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.11.066] [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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20
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Koyama K, Saida Y, Abe T, Satokata M, Mishina Y, Sato K, Shoji S, Tanaka T, Nozaki K, Ichikawa K, Miyabayashi T, Ota T, Fujimori F, Ito R, Kondo R, Hiura T, Okajima M, Miura S, Watanabe S, Matsumoto N, Tanaka H, Kikuchi T. P2.03-015 Efficacy of EGFR-TKIs for EGFR Mutant NSCLC Patients with Central Nervous System Metastases: A Retrospective Analysis. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1266] [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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21
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Fu W, Shigetou A, Shoji S, Mizuno J. Low-temperature direct heterogeneous bonding of polyether ether ketone and platinum. Materials Science and Engineering: C 2017. [DOI: 10.1016/j.msec.2017.05.058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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22
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Shoji S, Kohsaka S, Ueda I, Sawano M, Ikemura N, Katsuki T, Hiraide T, Maekawa Y, Yuasa S, Hayashida K, Noma S, Suzuki M, Numasawa Y, Miyata H, Fukuda K. 2033Incidence and predictors of stroke after percutaneous coronary intervention in the era of transradial intervention. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.2033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Suaebah E, Naramura T, Myodo M, Hasegawa M, Shoji S, Buendia JJ, Kawarada H. Aptamer-Based Carboxyl-Terminated Nanocrystalline Diamond Sensing Arrays for Adenosine Triphosphate Detection. Sensors (Basel) 2017; 17:s17071686. [PMID: 28753998 PMCID: PMC5539861 DOI: 10.3390/s17071686] [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] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 07/10/2017] [Accepted: 07/20/2017] [Indexed: 02/07/2023]
Abstract
Here, we propose simple diamond functionalization by carboxyl termination for adenosine triphosphate (ATP) detection by an aptamer. The high-sensitivity label-free aptamer sensor for ATP detection was fabricated on nanocrystalline diamond (NCD). Carboxyl termination of the NCD surface by vacuum ultraviolet excimer laser and fluorine termination of the background region as a passivated layer were investigated by X-ray photoelectron spectroscopy. Single strand DNA (amide modification) was used as the supporting biomolecule to immobilize into the diamond surface via carboxyl termination and become a double strand with aptamer. ATP detection by aptamer was observed as a 66% fluorescence signal intensity decrease of the hybridization intensity signal. The sensor operation was also investigated by the field-effect characteristics. The shift of the drain current–drain voltage characteristics was used as the indicator for detection of ATP. From the field-effect characteristics, the shift of the drain current–drain voltage was observed in the negative direction. The negative charge direction shows that the aptamer is capable of detecting ATP. The ability of the sensor to detect ATP was investigated by fabricating a field-effect transistor on the modified NCD surface.
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Affiliation(s)
- Evi Suaebah
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
| | - Takuro Naramura
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
| | - Miho Myodo
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
| | - Masataka Hasegawa
- Technology Research Association for Single Wall Carbon Nanotube (TASC), 1-1-1 Higashi, Tsukuba 305-8565, Japan.
| | - Shuichi Shoji
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
| | - Jorge J Buendia
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
| | - Hiroshi Kawarada
- Department of Nanoscience and Nanoengineering, School of Advanced Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
- Kagami Memorial Research Institute for Material Science and Technology, Shinjuku-ku, Tokyo 169-0051, Japan.
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Shoji S, Suzuki A, Conrado DJ, Peterson MC, Hey-Hadavi J, McCabe D, Rojo R, Tammara BK. Dissociated Agonist of Glucocorticoid Receptor or Prednisone for Active Rheumatoid Arthritis: Effects on P1NP and Osteocalcin Pharmacodynamics. CPT Pharmacometrics Syst Pharmacol 2017; 6:439-448. [PMID: 28556506 PMCID: PMC5529777 DOI: 10.1002/psp4.12201] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 04/05/2017] [Accepted: 04/10/2017] [Indexed: 11/29/2022]
Abstract
Fosdagrocorat (PF‐04171327), a dissociated agonist of the glucocorticoid receptor, has potent anti‐inflammatory activity in patients with rheumatoid arthritis with reduced adverse effects on bone health. To identify fosdagrocorat doses with bone formation marker changes similar to prednisone 5 mg, we characterized treatment‐related changes in amino‐terminal propeptide of type I collagen (P1NP) and osteocalcin (OC) with fosdagrocorat (1, 5, 10, or 15 mg) and prednisone (5 or 10 mg) in a phase II randomized trial (N = 323). The time course of markers utilized a mixed‐effects longitudinal kinetic‐pharmacodynamic model. Median predicted changes from baseline at week 8 with fosdagrocorat 5, 10, and 15 mg were −18, −22, and −22% (P1NP), and −7, −13, and −17% (OC), respectively. Changes with prednisone 5 and 10 mg were −15% and −18% (P1NP) and −10% and −17% (OC). The probability of fosdagrocorat doses up to 15 mg being noninferior to prednisone 5 mg for P1NP and OC changes was >90%.
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Affiliation(s)
- S Shoji
- Pfizer Japan Inc, Tokyo, Japan
| | | | | | | | | | - D McCabe
- Pfizer Inc, New York, New York, USA
| | - R Rojo
- Pfizer Inc, Groton, Connecticut, USA
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25
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Yoon DH, Kobayashi K, Tanaka D, Sekiguchi T, Shoji S. Simple microfluidic formation of highly heterogeneous microfibers using a combination of sheath units. Lab Chip 2017; 17:1481-1486. [PMID: 28301613 DOI: 10.1039/c7lc00157f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This paper presents the formation of complex cross-sectional microfibers using three-dimensional microfluidic devices. The compartments and shapes of core and shell layers in the microfibers were independently controlled via three-dimensional fluidic channels fabricated by the combination of sheath units. The number of layers is easily expanded by the stacking of these units. Therefore, the highly heterogeneous microfibers of alginate hydrogel are obtained in polydimethylsiloxane structures. This widely expandable method has great potential for the development of functional and complex fiber-shaped materials.
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Affiliation(s)
- D H Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
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26
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Abstract
A fully passive volume-dependent droplet sorter using repeated and multiple on-rail transfer of microdroplets in a cascade channel is presented in this research.
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Affiliation(s)
- D. H. Yoon
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
| | - Z. Xie
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
| | - D. Tanaka
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo
- Japan
| | - T. Sekiguchi
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo
- Japan
| | - S. Shoji
- Faculty of Science and Engineering
- Waseda University
- Tokyo
- Japan
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27
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Tanaka D, Sawai S, Yoon DH, Sekiguchi T, Akitsu T, Shoji S. Synthesis of an azo-Mn( ii) complex with mild pH control using a microfluidic device. RSC Adv 2017. [DOI: 10.1039/c7ra06089k] [Citation(s) in RCA: 5] [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: 11/21/2022] Open
Abstract
This study describes a new control method of pH for azo-Mn(ii) complexes that requiring an accurate pH control by fluidic device.
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Affiliation(s)
- Daiki Tanaka
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Shunsuke Sawai
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
| | - Takashiro Akitsu
- Department of Chemistry
- Faculty of Science
- Tokyo University of Science
- Tokyo 162-8601
- Japan
| | - Shuichi Shoji
- Research Organization for Nano & Life Innovation
- Waseda University
- Tokyo 162-0041
- Japan
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Kasahara T, Kuwae H, Kobayashi N, Nobori A, Oshima J, Shoji S, Mizuno J. Recent Advances in Research and Development of Microfluidic Organic Light-Emitting Devices. J PHOTOPOLYM SCI TEC 2017. [DOI: 10.2494/photopolymer.30.467] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | | | - Atsuki Nobori
- Faculty of Science and Engineering, Waseda University
| | - Juro Oshima
- Frontier Materials Research Department, Materials Research Laboratories, Nissan Chemical Industries, Ltd
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University
| | - Jun Mizuno
- Research Organization for Nano & Life Innovation, Waseda University
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29
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Isokawa M, Takatsuki K, Song Y, Shih K, Nakanishi K, Xie Z, Yoon DH, Sekiguchi T, Funatsu T, Shoji S, Tsunoda M. Liquid Chromatography Chip with Low-Dispersion and Low-Pressure-Drop Turn Structure Utilizing a Distribution-Controlled Pillar Array. Anal Chem 2016; 88:6485-91. [DOI: 10.1021/acs.analchem.6b01201] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Muneki Isokawa
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Katsuya Takatsuki
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Yanting Song
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Kailing Shih
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Kanki Nakanishi
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Zhimin Xie
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Dong Hyun Yoon
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Tetsushi Sekiguchi
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Takashi Funatsu
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Shuichi Shoji
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Makoto Tsunoda
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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30
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Abstract
A microfluidic stamping method to form functional shapes on a cross section in fiber-shaped flow is proposed. Microfluidic stamping and overstamping allow various cross sectional shapes on the 3D flow. The shapes can be controlled by a change in combination of structures and fluidic conditions which correspond to stamp type and stamping force.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo, 162-0041, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513 Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo, 162-0041, Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
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Nakamura K, Iizuka R, Nishi S, Yoshida T, Hatada Y, Takaki Y, Iguchi A, Yoon DH, Sekiguchi T, Shoji S, Funatsu T. Culture-independent method for identification of microbial enzyme-encoding genes by activity-based single-cell sequencing using a water-in-oil microdroplet platform. Sci Rep 2016; 6:22259. [PMID: 26915788 PMCID: PMC4768102 DOI: 10.1038/srep22259] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 02/10/2016] [Indexed: 12/22/2022] Open
Abstract
Environmental microbes are a great source of industrially valuable enzymes with potent and unique catalytic activities. Unfortunately, the majority of microbes remain unculturable and thus are not accessible by culture-based methods. Recently, culture-independent metagenomic approaches have been successfully applied, opening access to untapped genetic resources. Here we present a methodological approach for the identification of genes that encode metabolically active enzymes in environmental microbes in a culture-independent manner. Our method is based on activity-based single-cell sequencing, which focuses on microbial cells showing specific enzymatic activities. First, at the single-cell level, environmental microbes were encapsulated in water-in-oil microdroplets with a fluorogenic substrate for the target enzyme to screen for microdroplets that contain microbially active cells. Second, the microbial cells were recovered and subjected to whole genome amplification. Finally, the amplified genomes were sequenced to identify the genes encoding target enzymes. Employing this method, we successfully identified 14 novel β-glucosidase genes from uncultured bacterial cells in marine samples. Our method contributes to the screening and identification of genes encoding industrially valuable enzymes.
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Affiliation(s)
- Kazuki Nakamura
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ryo Iizuka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shinro Nishi
- Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Takao Yoshida
- Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Yuji Hatada
- Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Yoshihiro Takaki
- Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Ayaka Iguchi
- Department of NanoscieWnce and Nanoengineering (ASE Graduate School), Waseda University, 3-4-1 Okubo, Shinju-ku, Tokyo 169-8555, Japan
| | - Dong Hyun Yoon
- Department of NanoscieWnce and Nanoengineering (ASE Graduate School), Waseda University, 3-4-1 Okubo, Shinju-ku, Tokyo 169-8555, Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano &Life Innovation, Waseda University, 513, Waseda-tsurumaki-cho, Shinjuku-ku, Tokyo, 162-0041, Japan
| | - Shuichi Shoji
- Department of NanoscieWnce and Nanoengineering (ASE Graduate School), Waseda University, 3-4-1 Okubo, Shinju-ku, Tokyo 169-8555, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Tanaka D, Kawakubo W, Tsuda E, Mitsumoto Y, Yoon DH, Sekiguchi T, Akitsu T, Shoji S. Microfluidic synthesis of chiral salen Mn( ii) and Co( ii) complexes containing lysozyme. RSC Adv 2016. [DOI: 10.1039/c6ra09975k] [Citation(s) in RCA: 6] [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: 11/21/2022] Open
Abstract
Efficient microfluidic synthesis of chiral salen Mn(ii) and Co(ii) complexes containing lysozyme was achieved.
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Affiliation(s)
- Daiki Tanaka
- Research Organization for Nano & Life Innovation
- Waseda University
- 120-5 Research Development Center
- Tokyo 162-0041
- Japan
| | - Wataru Kawakubo
- Research Organization for Nano & Life Innovation
- Waseda University
- 120-5 Research Development Center
- Tokyo 162-0041
- Japan
| | - Erika Tsuda
- Department of Chemistry
- Faculty of Science
- Tokyo University of Science
- Tokyo 162-8601
- Japan
| | - Yuya Mitsumoto
- Department of Chemistry
- Faculty of Science
- Tokyo University of Science
- Tokyo 162-8601
- Japan
| | - Dong Hyun Yoon
- Research Organization for Nano & Life Innovation
- Waseda University
- 120-5 Research Development Center
- Tokyo 162-0041
- Japan
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation
- Waseda University
- 120-5 Research Development Center
- Tokyo 162-0041
- Japan
| | - Takashiro Akitsu
- Department of Chemistry
- Faculty of Science
- Tokyo University of Science
- Tokyo 162-8601
- Japan
| | - Shuichi Shoji
- Research Organization for Nano & Life Innovation
- Waseda University
- 120-5 Research Development Center
- Tokyo 162-0041
- Japan
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33
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Nagata Y, Inaba M, Imanishi Y, Okazaki H, Yamada S, Mori K, Shoji S, Koyama H, Okuno S. Increased undercarboxylated osteocalcin/intact osteocalcin ratio in patients undergoing hemodialysis. Osteoporos Int 2015; 26:1053-61. [PMID: 25403902 DOI: 10.1007/s00198-014-2954-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 10/27/2014] [Indexed: 01/24/2023]
Abstract
UNLABELLED Serum undercarboxylated osteocalcin (ucOC)/intact osteocalcin (iOC) ratio increased >1.0 in the patients undergoing hemodialysis, particularly in those with high bone turnover state. Consequently, serum ucOC/iOC ratio might lose its significance as a bone metabolic marker to indicate vitamin K deficiency in hemodialysis patients. INTRODUCTION Serum intact osteocalcin (iOC), undercarboxylated OC (ucOC), and the ucOC/iOC ratio are considered clinically relevant indices in pre-dialysis chronic kidney disease (CKD) and hemodialysis (HD) patients, despite their accumulation in uremic serum. METHODS Serum iOC and ucOC were measured along with serum intact parathyroid hormone (iPTH), bone alkaline phosphatase (BAP), and tartrate-resistant acid phosphatase (TRACP)-5b in 89 pre-dialysis CKD and 189 HD patients. RESULTS Serum iOC and ucOC showed significantly negative correlations with estimated glomerular filtration rate in pre-dialysis CKD patients, although serum ucOC/iOC ratio did not correlate. Serum ucOC was significantly greater in HD patients than in pre-dialysis CKD patients, while serum iOC did not differ significantly, resulting in serum ucOC/iOC ratio >1.0 in 135 (71.4%) out of 189 HD patients. HD patients with high serum ucOC/iOC ratio (>1.0) had a significantly younger age and significantly higher values of body mass index, serum creatinine, albumin, phosphate, iPTH, and TRACP-5b than those with low ucOC/iOC ratio (≤ 1.0). The baseline iPTH and P1NP correlated with the changes of the ucOC/iOC ratio during the 2 days of the inter-dialytic period. Multivariate analysis showed that log [ucOC/iOC] in HD patients was significantly associated with log [iPTH], log [BAP], or log [TRACP-5b]. CONCLUSIONS Serum ucOC/iOC ratio >1.0 was observed in as high as 71.4% of HD patients, preferentially with high bone turnover state, in comparison with pre-dialysis CKD patients. These data suggested that serum ucOC/iOC ratio might lose its significance as a bone metabolic marker to indicate vitamin K deficiency in HD patients.
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Affiliation(s)
- Y Nagata
- Department of Metabolism, Endocrinology and Molecular Medicine, Osaka City University Graduate School of Medicine, 1-4-3, Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan
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34
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Yoon DH, Wakui D, Nakahara A, Sekiguchi T, Shoji S. Selective droplet sampling using a minimum number of horizontal pneumatic actuators in a high aspect ratio and highly flexible PDMS device. RSC Adv 2015. [DOI: 10.1039/c4ra11254g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This paper presents a droplet sampling device driven by horizontal pneumatic actuators.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Daisuke Wakui
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Asahi Nakahara
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
| | - Tetsushi Sekiguchi
- Institute for Nanoscience and Nanoengineering
- Waseda University
- Tokyo 162-0041
- Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering
- Waseda University
- Tokyo 169-8555
- Japan
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35
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Hosokawa M, Hoshino Y, Nishikawa Y, Hirose T, Yoon DH, Mori T, Sekiguchi T, Shoji S, Takeyama H. Droplet-based microfluidics for high-throughput screening of a metagenomic library for isolation of microbial enzymes. Biosens Bioelectron 2014; 67:379-85. [PMID: 25194237 DOI: 10.1016/j.bios.2014.08.059] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 08/15/2014] [Accepted: 08/22/2014] [Indexed: 10/24/2022]
Abstract
This paper proposes a high-throughput, function-based screening approach of a metagenomic library for isolating novel microbial enzymes by droplet-based microfluidics. We used gel microdroplets (GMDs) dispersed in oil as picoliter-volume reaction vessels for lipolytic enzyme by encapsulating cells in individual GMDs. Using this approach, we monitored the growth of individual cells encapsulated in GMDs and assessed the enzyme reaction activities at the level of an individual GMD. We then applied this method to screen lipolytic enzyme genes from the metagenomic library constructed from soil collected from a quercus serrate forest of Mount Tsukuba, Ibaraki, Japan. In the workflow presented in this study, metagenomic library clones were encapsulated in 100-pL GMDs with a fluorogenic reporter substrate. A total of 67,000 metagenomic library clones can be screened in only 24 h with reduced consumption of reagents (i.e., <10 μL). As a result, we identified a novel lipolytic enzyme, EstT1, belonging to the EstD2 family of esterases and containing a putative signal peptide, which facilitates enzyme export and catalyzation of substrates in the periplasm. Our study demonstrates the potential of microfluidic GMDs as an efficient tool for metagenomic library screening of industrially relevant enzymes with the potential of significantly reducing the cost and time factors involved in successful practical application of microbial enzymes.
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Affiliation(s)
- Masahito Hosokawa
- Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan; Institute for Nanoscience and Nanotechnology, Waseda University, 513, Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), 5, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Yuri Hoshino
- Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Yohei Nishikawa
- Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan
| | - Tomotada Hirose
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Tetsushi Mori
- Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan; Institute for Nanoscience and Nanotechnology, Waseda University, 513, Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), 5, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
| | - Tetsushi Sekiguchi
- Institute for Nanoscience and Nanotechnology, Waseda University, 513, Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan
| | - Shuichi Shoji
- Institute for Nanoscience and Nanotechnology, Waseda University, 513, Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan; Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Haruko Takeyama
- Department of Life Science and Medical Bioscience, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan; Institute for Nanoscience and Nanotechnology, Waseda University, 513, Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan; Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST), 5, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan.
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36
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Yoon DH, Jamshaid A, Ito J, Nakahara A, Tanaka D, Akitsu T, Sekiguchi T, Shoji S. Active microdroplet merging by hydrodynamic flow control using a pneumatic actuator-assisted pillar structure. Lab Chip 2014; 14:3050-5. [PMID: 24961178 DOI: 10.1039/c4lc00378k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This paper describes a microdroplet merging device that can actively control the merging of various droplets under a wide range of flow conditions, using a simple structure. The microdroplets were trapped and merged in a wide chamber divided by pillars, and their behavior was controlled by two horizontal pneumatic microactuators. Hydrodynamic flow control by the actuation was evaluated numerically, and the trapping and merging of droplets were achieved experimentally and controlled via pressure applied to the microactuators. Furthermore, two independently generated droplets were merged under four different modes, ranging from no merging to four-droplet merging, with different ratios and volumes. The pneumatic actuators allowed not only the control of the number of merged droplets, but also a wide range of applied droplet volumes. The device was fabricated simply using a single-layer PDMS (polydimethylsiloxane) structure, and the continuous merging performance operated using only hydrodynamic flow control without any surfactant. Finally, chemical synthesis of a metal complex was performed by the droplet merging method. Crystallization of the complex was visualized in real time, and the synthesis was verified by ultraviolet-visible spectroscopy.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, Japan.
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Fusaro M, Giannini S, Miozzo D, Noale M, Tripepi G, Plebani M, Zaninotto M, Piccoli A, Vilei MT, Cristofaro R, Gallieni M, Hamamoto K, Inaba M, Okuno S, Imanishi Y, Ishimura E, Yamakawa T, Shoji S, Rothe HM, Eller P, Mayer G, Ketteler M, Kramar R, Shaheen F, Al Rukhaimi M, Alsahow A, Al-Ali F, Al Salmi I, Al Ghareeb S, Wang M, Bieber B, Robinson BM, Pisoni RL, Waniewski J, Debowska M, Wojcik-Zaluska A, Ksiazek A, Zaluska W, De Broe ME, Wilson RJ, Copley JB, Hiramtasu R, Ubara Y, Hoshino J, Takaichi K, Ghalli FG, Ghalli FG, Ibakkanavar R, Chess J, Roberts G, Riley S, Oliveira ASA, Carvalho CJB, Oliveira CBL, Pessoa CTBC, Leao RAS, Gueiros JEB, Gueiros APS, Okano K, Tsuruta Y, Hibi A, Tsukada M, Miwa N, Kimata N, Tsuchiya K, Akiba T, Nitta K, Mizobuchi M, Ogata H, Hosaka N, Sanada D, Arai N, Koiwa F, Kinugasa E, Shibata T, Akizawa T, Delanaye P, Krzesinski JM, Warling X, Moonen M, Smelten N, Medart L, Pottel H, Cavalier E, Delanaye P, Souberbielle JC, Gadisseur R, Dubois BE, Krzesinski JM, Cavalier E, Matias P, Jorge C, Mendes M, Azevedo A, Navarro D, Ferreira C, Amaral T, Aires I, Gil C, Ferreira A, Kikuchi H, Shimada H, Karasawa R, Suzuki M, An WS, Lee SM, Oh YJ, Son YK, De Paola L, Lombardi G, Panzino MT, Lombardi L, Reichel H, Hahn KM, Kohnle M, Guggenberger C, Delanna F, Sasaki N, Tsunoda M, Ikee R, Hashimoto N, Sola L, Leyun MN, Diaz JC, Sehabiague C, Gonzalez S, Alallon W, Bourbeau K, Lajoie C, Macway F, Fujii T, Suzuki S, Shinozaki M, Tanaka H, Klingele M, Seiler S, Poppleton A, Lepper P, Fliser D, Seidel R, Lun L, Liu D, Li X, Wei X, Miao J, Gao Z, Hu R, De Paola L, Lombardi G, Panzino MT, Lombardi L, Gros B, Galan A, Gonzalez-Parra E, Herrero JA, Echave M, Vegter S, Tolley K, Oyaguez I, Gutzwiller FS, Braunhofer PG, Szucs TD, Schwenkglenks M, Yilmaz VT, Ozdem S, Donmez L, Kocak H, Dinckan A, Cetinkaya R, Suleymanlar G, Ersoy FF. DIALYSIS BONE DISEASE. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu157] [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: 11/13/2022] Open
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Yoon DH, Numakunai S, Nakahara A, Sekiguchi T, Shoji S. Hydrodynamic on-rail droplet pass filter for fully passive sorting of droplet-phase samples. RSC Adv 2014. [DOI: 10.1039/c4ra08354g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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] Open
Abstract
A hydrodynamic droplet pass filter for droplet-phase sample sorting was developed in this study.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering
- Waseda University
- Tokyo, Japan
| | | | - Asahi Nakahara
- Faculty of Science and Engineering
- Waseda University
- Tokyo, Japan
| | - Tetsushi Sekiguchi
- Institute for Nanoscience and Nanoengineering
- Waseda University
- Tokyo, Japan
| | - Shuichi Shoji
- Faculty of Science and Engineering
- Waseda University
- Tokyo, Japan
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Inaba M, Okuno S, Imanishi Y, Ishimura E, Yamakawa T, Shoji S. Increased active PTH(1-84) fraction as a predictor of poor mortality in male hemodialysis patients. Osteoporos Int 2013; 24:2863-70. [PMID: 24030285 DOI: 10.1007/s00198-012-2245-x] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Accepted: 11/29/2012] [Indexed: 10/26/2022]
Abstract
UNLABELLED We reported previously that serum parathyroid hormone [PTH(1-84)]/intact PTH[PTH(1-84) + PTH(7-84)] ratio provides the better marker for parathyroid function and bone turnover state than serum PTH level itself. The present study demonstrated that higher PTH(1-84)/intact PTH ratio, but not serum PTH(1-84) and intact PTH, predicted higher all-cause mortality in 177 male hemodialysis patients. INTRODUCTION We reported that PTH(1-84)/intact PTH ratio provides a clinically relevant marker for parathyroid function and the resultant bone turnover state. The purpose of our study was to investigate the association of PTH(1-84)/intact PTH ratio with all-cause mortality (ACM) in male hemodialysis patients. METHODS The study was performed for 70 months. Serum PTH in 177 male hemodialysis patients was measured with PTH(1-84)-specific whole PTH assay and intact PTH assay which cross-reacts with N-truncated PTH including PTH(7-84). RESULTS The patients (n = 177) were divided into higher and lower halves based on serum levels of PTH(1-84)/intact PTH ratio (cutoff value, 0.484), intact PTH (143.8 pg/mL), and PTH(1-84) (64.1 pg/mL). In Kaplan-Meier analysis, the higher group in whole PTH/intact PTH ratio had significantly higher ACM than the lower group (P = 0.020 by log-rank test), in contrast with the insignificant difference between the higher and lower groups in intact PTH and PTH(1-84). Multivariate Cox regression hazard analysis identified higher log [PTH(1-84)/intact PTH ratio], but not log intact PTH or log PTH(1-84) as a significant independent predictor [hazard ratio 14.428 (95% CI 2.486-83.728)] for ACM after adjustment for various factors including age, hemodialysis duration, presence/absence of diabetes mellitus, BMI, log C-reactive protein, serum albumin, calcium, and phosphate. The association existed between log [PTH(1-84)/intact PTH ratio] and ACM in those without vitamin D administration (n = 95). CONCLUSION Higher PTH(1-84)/intact PTH ratio, which provides a relevant marker for parathyroid function, may be a significant predictor of ACM in male hemodialysis patients.
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Affiliation(s)
- M Inaba
- Department of Metabolism, Endocrinology and Molecular Medicine, Internal Medicine, Osaka City University Graduate School of Medicine, 1-4-3, Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan,
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Elewa U, Fernandez B, Egido J, Ortiz A, Kaifu K, Tahara N, Ueda S, Yamagishi SI, Takeuchi M, Okuda S, Buraczynska M, Zukowski P, Wacinski P, Ksiazek A, Wu HY, Peng YS, Hung KY, Wu KD, Tu YK, Chien KL, Papale M, Vocino G, Di Paolo S, Pontrelli P, Conserva F, Rocchetti MT, Grandaliano G, De Cosmo S, Gesualdo L, Prkacin I, Duvnjak L, Bulum T, Prkacin I, Duvnjak L, Bulum T, Dumann K, Horrmann B, Lammert A, Gorski M, Kramer B, Heid I, Boger C, Aggarwal HK, Jain D, Talapatra P, Lenghel AR, Moldovan D, Rusu CC, Rusu A, Rahaian R, Bondor CI, Kacso IM, Unal A, Kocyigit I, Yilmaz S, Eser B, Elmali F, Sipahioglu M, Tokgoz B, Oymak O, Velioglu A, Guler D, Arikan H, Koc M, Tuglular S, Ozener C, Pallayova M, Rayner HC, Taheri S, Dasgupta I, Fernandes FB, Fernandes AB, Febba ACDS, Vitalle MSDS, Jung F, Casarini DE, Liu F, Huang M, Fu P, Bulatovic A, Popovic J, Ille K, Jelic S, Beljic Zivkovic T, Dimkovic N, Kohli HS, Ramachandran R, Kumar S, Jha V, Sakhuja V, Hamamoto K, Inaba M, Yamada S, Yoda K, Imanishi Y, Emoto M, Okuno S, Shoji S, Silva A, Fragoso A, Pinho A, Silva C, Santos N, Faisca M, Neves PL, Capolongo G, Restivo A, Pluvio M, Capasso G, Bello BT, Mabayoje OM, Amira OC, Theodoridis M, Panagoutsos S, Roumeliotis A, Kantartzi K, Tsigalou C, Passadakis P, Vargemezis V, Deeb A, Zaoui P, Le Penven S, Tartry D, Ducher M, Fauvel JP, Angioi A, Asunis AM, Cao R, Atzeni A, Conti M, Floris M, Melis P, Pili G, Piras D, Piredda G, Pani A, Murata M, Ishikawa SE, Aoki A, Unal A, Kocyigit I, Cerci I, Dogan E, Arikan T, Sipahioglu M, Tokgoz B, Oymak O, Madziarska K, Letachowicz K, Golebiowski T, Zmonarski SC, Krajewska M, Letachowicz W, Penar J, Kusztal M, Augustyniak-Bartosik H, Klak R, Weyde W, Klinger M. Diabetes - clinical studies. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft112] [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: 11/12/2022] Open
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Hirata M, Tashiro Y, Aizawa K, Endo K, Hirata M, Tashiro Y, Endo K, Aizawa K, Serizawa K, Hirata M, Yogo K, Tashiro Y, Endo K, Cases A, Portoles J, Calls J, Martinez-Castelao A, Munar MA, Segarra A, Samouilidou E, Pantelias K, Petras D, Mpakirtzi T, Pipili C, Chatzivasileiou G, Vasiliou K, Denda E, Grapsa E, Tzanatos H, Shoji S, Inaba M, Tomosugi N, Okuno S, Ichii M, Yamakawa T, Kurihara S, Barsan L, Stanciu A, Stancu S, Capusa C, Bratescu L, Mircescu G, Barsan L, Stanciu A, Stancu S, Capusa C, Mircescu G, Kuo KL, Hung SC, Lee TS, Tarng DC, Nistor I, Covic A, Goldsmith D, Garrido P, Fernandes J, Ribeiro S, Vala H, Parada B, Alves R, Belo L, Costa E, Santos-Silva A, Reis F, Abdulnabi K, Ullah A, Abdulateef A, Howse M, Khalil A, Fouqueray B, Hoffmann M, Addison J, Manamley N, Stamopoulos D, Mpakirtzi N, Afentakis N, Grapsa E, Yu KH, Chou J, Klaus S, Schaddelee M, Kashiwa M, Takada A, Neff T, Galle J, Claes K, Di Giulio S, Guerin A, Herlitz H, Kiss I, Wirnsberger G, Manamley N, Addison J, Fouqueray B, Froissart M, Winearls C, Martinez Castelao A, Cases Amenos A, Torre Carballada A, Torralba Iranzo FJ, Bronsoms Artero JM, Toran Monserrat D, Valles Prats M, Merino JL, Espejo B, Bueno B, Amezquita Y, Paraiso V, Kiss Z, Kerkovits L, Ambrus C, Kulcsar I, Szegedi J, Benke A, Borbas B, Ferenczi S, Hengsperger M, Kazup S, Nagy L, Nemeth J, Rozinka A, Szabo T, Szelestei T, Toth E, Varga G, Wagner G, Zakar G, Gergely L, Kiss I, Exarchou K, Tanahill N, Anthoney A, Khalil A, Ahmed S, Capusa C, Oprican R, Stanciu A, Lipan M, Stancu S, Chirculescu B, Mircescu G, Ferenczi S, Roger S, Malecki R, Farouk M, Dellanna F, Thomas M, Manamley N, Touam M, Chantrel F, Bouiller M, Hurot JM, Raphael T, Testa A, Veillon S, Vendrely B, Masoumi Z, Ahmadpoor P, Ghaderian SMH, Nafar M, Samavat S, Samadian F, Poorrezagholi F, Shahidi M, Riccio E, Visciano B, Capuano I, Memoli A, Mozzillo G, Memoli B, Pisani A. Anaemia in CKD 1-5. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Okuno S, Ishimura E, Tsuboniwa N, Norimine K, Yamakawa K, Yamakawa T, Shoji S, Mori K, Nishizawa Y, Inaba M. Significant inverse relationship between serum undercarboxylated osteocalcin and glycemic control in maintenance hemodialysis patients. Osteoporos Int 2013; 24:605-12. [PMID: 22581293 DOI: 10.1007/s00198-012-2003-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 03/20/2012] [Indexed: 01/29/2023]
Abstract
SUMMARY Increased levels of serum undercarboxylated osteocalcin, which were associated with bone metabolism markers, correlated inversely with indices of glucose metabolism (plasma glucose, hemoglobin A1C, and glycated albumin) in hemodialysis patients with abnormalities of bone metabolism. INTRODUCTION Undercarboxylated osteocalcin (ucOC), a possible marker of bone metabolism and one of the osteoblast-specific secreted proteins, has recently been reported to be associated with glucose metabolism. We tested the hypothesis that ucOC levels are associated with indices of glucose metabolism in chronic hemodialysis patients with abnormalities of bone metabolism. METHODS Serum ucOC, bone alkaline phosphatase (BAP, a bone formation marker), and tartrate-resistant acid phosphatase-5b (TRACP-5b, a bone resorption marker) were measured in 189 maintenance hemodialysis patients (96 diabetics and 93 non-diabetics), and their relationships with glucose metabolism were examined. RESULTS ucOC correlated positively with BAP (ρ = 0.489, p < 0.0001), TRACP-5b (ρ = 0.585, p < 0.0001) and intact parathyroid hormone (iPTH; ρ = 0.621, p < 0.0001). Serum ucOC levels in the diabetic patients were lower than those of non-diabetic patients (p < 0.001), although there were no significant differences in serum BAP or TRACP-5b between diabetic and non-diabetic patients. Serum ucOC correlated negatively with plasma glucose (ρ = -0.303, p < 0.0001), hemoglobin A1C (ρ = -0.214, p < 0.01), and glycated albumin (ρ = -0.271, p < 0.001), although serum BAP or TRACP-5b did not. In multiple linear regression analysis, log [plasma glucose], log [hemoglobin A1C], and log [glycated albumin] were associated significantly with log [ucOC] after adjustment for age, gender, hemodialysis duration, and body mass index but were not associated with log [BAP], log [TRACP-5b], or log [intact PTH]. CONCLUSION Increased levels of serum ucOC, which were associated with bone metabolism markers, were inversely associated with indices of glucose metabolism in hemodialysis patients.
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Affiliation(s)
- S Okuno
- Kidney Center, Shirasagi Hospital, Osaka, Japan
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Okada A, Shoji S, Shinohara H, Goto H, Sunakawa H, Matsueda T, Usui A, Yamaguchi AA, Mizuno J. Fabrication of Low Dislocation Density GaN Template by Nano-channel FIELO Using Nanoimprint Lithography. J PHOTOPOLYM SCI TEC 2013. [DOI: 10.2494/photopolymer.26.69] [Citation(s) in RCA: 5] [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: 11/09/2022]
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Okuno S, Ishimura E, Norimine K, Tsuboniwa N, Kagitani S, Yamakawa K, Yamakawa T, Sato KK, Hayashi T, Shoji S, Nishizawa Y, Inaba M. Serum adiponectin and bone mineral density in male hemodialysis patients. Osteoporos Int 2012; 23:2027-35. [PMID: 21927917 DOI: 10.1007/s00198-011-1789-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 08/22/2011] [Indexed: 01/11/2023]
Abstract
SUMMARY Bone mineral density of the 1/3 distal radius, ultra-distal radius, and lumbar spine correlated significantly and negatively with serum adiponectin. There was a significant positive correlation between serum adiponectin and serum NTX. Thus, adiponectin may play a role in mineral and bone disorder in chronic kidney disease stage 5 dialysis (CKD 5D) patients. INTRODUCTION Serum adiponectin, an adipocyte-produced hormone, has been reported to correlate negatively with bone mineral density (BMD) in the general population. However, little is known about the association between adiponectin and BMD in patients with CKD. METHODS BMD of the 1/3 distal and ultra-distal radius, which are enriched with cortical and cancellous bone, respectively, and the lumbar spine was measured by dual X-ray absorptiometry in 114 Japanese male hemodialysis patients (age 61.0 ± 11.1 years; hemodialysis duration 6.6 ± 3.0 years; 43.9% diabetics). Serum total adiponectin, bone formation marker (bone alkaline phosphatase, BAP), and bone resorption marker (cross-linked N-telopeptide of type I collagen (NTX)) were measured. RESULTS The BMD of the 1/3 distal radius, ultra-distal radius, and lumbar spine correlated significantly and negatively with serum adiponectin level (r = -0.229, p = 0.014; r = -0.286, p = 0.002; r = -0.227, p = 0.013, respectively). In multiple linear regression analyses, serum adiponectin was significantly and independently associated with the BMD of the 1/3 distal radius (R(2) = 0.173, p < 0.001) and ultra-distal radius (R(2) = 0.278, p < 0.001) after adjustment of age, hemodialysis duration, body weight, %fat mass, and log [intact PTH], although it was not with the BMD of the lumbar spine. There was a significant positive correlation between serum adiponectin and serum NTX (r = 0.321, p < 0.001), although there was no significant correlation between serum adiponectin and serum BAP. CONCLUSION Increased levels of serum adiponectin were associated with decrease in BMD in male hemodialysis patients. Adiponectin may play a role in mineral and bone disorder, possibly in bone resorption, of patients with CKD 5D.
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Affiliation(s)
- S Okuno
- Kidney Center, Shirasagi Hospital, 7-11-23, Kumata, Higashisumiyoshi-ku, Osaka, 546-0002, Japan
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Song Y, Noguchi M, Takatsuki K, Sekiguchi T, Mizuno J, Funatsu T, Shoji S, Tsunoda M. Integration of pillar array columns into a gradient elution system for pressure-driven liquid chromatography. Anal Chem 2012; 84:4739-45. [PMID: 22540342 DOI: 10.1021/ac3001836] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A gradient elution system for pressure-driven liquid chromatography (LC) on a chip was developed for carrying out faster and more efficient chemical analyses. Through computational fluid dynamics simulations and an experimental study, we found that the use of a cross-Tesla structure with a 3 mm mixing length was effective for mixing two liquids. A gradient elution system using a cross-Tesla mixer was fabricated on a 20 mm × 20 mm silicon chip with a separation channel of pillar array columns and a sample injection channel. A mixed solution of water and fluorescein in methanol was delivered to the separation channel 7 s after the gradient program had been started. Then, the fluorescence intensity increased gradually with the increasing ratio of fluorescein, which showed that the gradient elution worked well. Under the gradient elution condition, the retention times of two coumarin dyes decreased with the gradient time. When the gradient time was 30 s, the analysis could be completed in 30 s, which was only half the time required compared to that required for an isocratic elution. Fluorescent derivatives of aliphatic amines were successfully separated within 110 s. The results show that the proposed system is promising for the analyses of complex biological samples.
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Affiliation(s)
- Yanting Song
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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Ishibashi K, Goto H, Kasahara T, Mizuno J, Shoji S. Large Area Nano Pattern Fabrication Using Improved Step and Repeat UV Nanoimprint. J PHOTOPOLYM SCI TEC 2012. [DOI: 10.2494/photopolymer.25.235] [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: 11/09/2022]
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Okubo M, Tsutsui Y, Ishibashi K, Li L, Shoji S, Mizuno J, Yanagisawa M. Development of a Roll Press UV Imprint Process for Replication of Microstructures on a Large and Thin Quartz Substrate. J PHOTOPOLYM SCI TEC 2012. [DOI: 10.2494/photopolymer.25.229] [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: 11/09/2022]
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Shinohara H, Kitagawa F, Mizuno J, Shoji S, Ohara O, Takahashi Y, Nakahara A, Otsuka K. XPS and NEXAFS studies of VUV/O3-treated aromatic polyurea and its application to microchip electrophoresis. IET Nanobiotechnol 2011; 5:136-42. [DOI: 10.1049/iet-nbt.2011.0006] [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: 11/19/2022] Open
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Edagawa Y, Watanabe T, Fujii M, Kawai K, Shoji S. Local stimulation-induced cell death on microfluidic analysis: implication for intracellular transmission of apoptotic impact. Neurosci Res 2011. [DOI: 10.1016/j.neures.2011.07.1497] [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: 11/24/2022]
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Uchida T, Nakano M, Hongo S, Shoji S, Nagata Y. MP-13.14 High-Intensity Focused Ultrasound for the Treatment of Localized Prostate Cancer: Ten-year Follow-up. Urology 2011. [DOI: 10.1016/j.urology.2011.07.313] [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: 10/16/2022]
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