1
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Goto S, Tsutsumi A, Lee Y, Hosojima M, Kabasawa H, Komochi K, Nagatoishi S, Takemoto K, Tsumoto K, Nishizawa T, Kikkawa M, Saito A. Cryo-EM structures elucidate the multiligand receptor nature of megalin. Proc Natl Acad Sci U S A 2024; 121:e2318859121. [PMID: 38771880 DOI: 10.1073/pnas.2318859121] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 04/19/2024] [Indexed: 05/23/2024] Open
Abstract
Megalin (low-density lipoprotein receptor-related protein 2) is a giant glycoprotein of about 600 kDa, mediating the endocytosis of more than 60 ligands, including those of proteins, peptides, and drug compounds [S. Goto, M. Hosojima, H. Kabasawa, A. Saito, Int. J. Biochem. Cell Biol. 157, 106393 (2023)]. It is expressed predominantly in renal proximal tubule epithelial cells, as well as in the brain, lungs, eyes, inner ear, thyroid gland, and placenta. Megalin is also known to mediate the endocytosis of toxic compounds, particularly those that cause renal and hearing disorders [Y. Hori et al., J. Am. Soc. Nephrol. 28, 1783-1791 (2017)]. Genetic megalin deficiency causes Donnai-Barrow syndrome/facio-oculo-acoustico-renal syndrome in humans. However, it is not known how megalin interacts with such a wide variety of ligands and plays pathological roles in various organs. In this study, we elucidated the dimeric architecture of megalin, purified from rat kidneys, using cryoelectron microscopy. The maps revealed the densities of endogenous ligands bound to various regions throughout the dimer, elucidating the multiligand receptor nature of megalin. We also determined the structure of megalin in complex with receptor-associated protein, a molecular chaperone for megalin. The results will facilitate further studies on the pathophysiology of megalin-dependent multiligand endocytic pathways in multiple organs and will also be useful for the development of megalin-targeted drugs for renal and hearing disorders, Alzheimer's disease [B. V. Zlokovic et al., Proc. Natl. Acad. Sci. U.S.A. 93, 4229-4234 (1996)], and other illnesses.
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Affiliation(s)
- Sawako Goto
- Department of Applied Molecular Medicine, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Yongchan Lee
- Department of the Biological Membrane Dynamics, Graduate School of Medical Life Science, Yokohama City University, Yokohama 230-0045, Japan
| | - Michihiro Hosojima
- Department of Clinical Nutrition Science, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
| | - Hideyuki Kabasawa
- Department of Clinical Nutrition Science, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
| | - Koichi Komochi
- Department of Clinical Nutrition Science, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
| | - Satoru Nagatoishi
- Medical Device Development and Regulation Research Center, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Kazuya Takemoto
- Department of Applied Molecular Medicine, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
| | - Kouhei Tsumoto
- Department of Bioengineering, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Tomohiro Nishizawa
- Department of the Biological Membrane Dynamics, Graduate School of Medical Life Science, Yokohama City University, Yokohama 230-0045, Japan
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Akihiko Saito
- Department of Applied Molecular Medicine, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City 951-8510, Japan
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2
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Bui HB, Watanabe S, Nomura N, Liu K, Uemura T, Inoue M, Tsutsumi A, Fujita H, Kinoshita K, Kato Y, Iwata S, Kikkawa M, Inaba K. Cryo-EM structures of human zinc transporter ZnT7 reveal the mechanism of Zn 2+ uptake into the Golgi apparatus. Nat Commun 2023; 14:4770. [PMID: 37553324 PMCID: PMC10409766 DOI: 10.1038/s41467-023-40521-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 07/27/2023] [Indexed: 08/10/2023] Open
Abstract
Zinc ions (Zn2+) are vital to most cells, with the intracellular concentrations of Zn2+ being tightly regulated by multiple zinc transporters located at the plasma and organelle membranes. We herein present the 2.2-3.1 Å-resolution cryo-EM structures of a Golgi-localized human Zn2+/H+ antiporter ZnT7 (hZnT7) in Zn2+-bound and unbound forms. Cryo-EM analyses show that hZnT7 exists as a dimer via tight interactions in both the cytosolic and transmembrane (TM) domains of two protomers, each of which contains a single Zn2+-binding site in its TM domain. hZnT7 undergoes a TM-helix rearrangement to create a negatively charged cytosolic cavity for Zn2+ entry in the inward-facing conformation and widens the luminal cavity for Zn2+ release in the outward-facing conformation. An exceptionally long cytosolic histidine-rich loop characteristic of hZnT7 binds two Zn2+ ions, seemingly facilitating Zn2+ recruitment to the TM metal transport pathway. These structures permit mechanisms of hZnT7-mediated Zn2+ uptake into the Golgi to be proposed.
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Affiliation(s)
- Han Ba Bui
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Satoshi Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, 980-8577, Japan
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Kehong Liu
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Tomoko Uemura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Michio Inoue
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Akihisa Tsutsumi
- Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Hiroyuki Fujita
- Advanced Research Laboratory, Canon Medical Systems Corporation, Otawara, 324-8550, Japan
| | - Kengo Kinoshita
- Department of System Bioinformatics, Graduate School of Information Sciences, Tohoku University, Sendai, Miyagi, 980-8579, Japan
- Department of Integrative Genomics, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Miyagi, 980-8573, Japan
| | - Yukinari Kato
- Graduate School of Medicine, Tohoku University, Sendai, 980-8575, Japan
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Masahide Kikkawa
- Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Kenji Inaba
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-8577, Japan.
- Department of Molecular and Chemical Life Sciences, Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, 980-8577, Japan.
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi, 980-8578, Japan.
- Medical Institute of Bioregulation, Kyushu University, Fukuoka, 812-8582, Japan.
- Core Research for Evolutional Science and Technology (CREST), Japan Agency for Medical Research and Development (AMED), Chiyoda-ku, Tokyo, Japan.
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3
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Takeda H, Busto JV, Lindau C, Tsutsumi A, Tomii K, Imai K, Yamamori Y, Hirokawa T, Motono C, Ganesan I, Wenz LS, Becker T, Kikkawa M, Pfanner N, Wiedemann N, Endo T. A multipoint guidance mechanism for β-barrel folding on the SAM complex. Nat Struct Mol Biol 2023; 30:176-187. [PMID: 36604501 DOI: 10.1038/s41594-022-00897-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 11/11/2022] [Indexed: 01/07/2023]
Abstract
Mitochondrial β-barrel proteins are essential for the transport of metabolites, ions and proteins. The sorting and assembly machinery (SAM) mediates their folding and membrane insertion. We report the cryo-electron microscopy structure of the yeast SAM complex carrying an early eukaryotic β-barrel folding intermediate. The lateral gate of Sam50 is wide open and pairs with the last β-strand (β-signal) of the substrate-the 19-β-stranded Tom40 precursor-to form a hybrid barrel in the membrane plane. The Tom40 barrel grows and curves, guided by an extended bridge with Sam50. Tom40's first β-segment (β1) penetrates into the nascent barrel, interacting with its inner wall. The Tom40 amino-terminal segment then displaces β1 to promote its pairing with Tom40's last β-strand to complete barrel formation with the assistance of Sam37's dynamic α-protrusion. Our study thus reveals a multipoint guidance mechanism for mitochondrial β-barrel folding.
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Affiliation(s)
- Hironori Takeda
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, Japan.,Nara Institute of Science and Technology, Ikoma, Japan
| | - Jon V Busto
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Caroline Lindau
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kentaro Tomii
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Kenichiro Imai
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan
| | - Yu Yamamori
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Takatsugu Hirokawa
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan.,Division of Biomedical Science, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Transborder Medical Research Center, University of Tsukuba, Tsukuba, Japan
| | - Chie Motono
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan.,Computational Bio Big-Data Open Innovation Laboratory, AIST, Waseda University, Tokyo, Japan
| | - Iniyan Ganesan
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Lena-Sophie Wenz
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany
| | - Thomas Becker
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nikolaus Pfanner
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany. .,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
| | - Nils Wiedemann
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany. .,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
| | - Toshiya Endo
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, Japan. .,Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto, Japan.
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4
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Takeda H, Busto JV, Lindau C, Tsutsumi A, Tomii K, Imai K, Yamamori Y, Hirokawa T, Motono C, Ganesan I, Wenz LS, Becker T, Kikkawa M, Pfanner N, Wiedemann N, Endo T. Author Correction: A multipoint guidance mechanism for β-barrel folding on the SAM complex. Nat Struct Mol Biol 2023; 30:233. [PMID: 36697808 DOI: 10.1038/s41594-023-00926-8] [Citation(s) in RCA: 1] [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: 01/26/2023]
Affiliation(s)
- Hironori Takeda
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, Japan.,Nara Institute of Science and Technology, Ikoma, Japan
| | - Jon V Busto
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Caroline Lindau
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kentaro Tomii
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Kenichiro Imai
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan
| | - Yu Yamamori
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Takatsugu Hirokawa
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan.,Division of Biomedical Science, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.,Transborder Medical Research Center, University of Tsukuba, Tsukuba, Japan
| | - Chie Motono
- Cellular and Molecular Biotechnology Research Institute, AIST, Tokyo, Japan.,Computational Bio Big-Data Open Innovation Laboratory, AIST, Waseda University, Tokyo, Japan
| | - Iniyan Ganesan
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Lena-Sophie Wenz
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Sanofi-Aventis Deutschland GmbH, Frankfurt, Germany
| | - Thomas Becker
- Institute of Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nikolaus Pfanner
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany. .,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
| | - Nils Wiedemann
- Institute of Biochemistry and Molecular Biology, Centre for Biochemistry and Molecular Cell Research, Faculty of Medicine, University of Freiburg, Freiburg, Germany. .,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany. .,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
| | - Toshiya Endo
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto, Japan. .,Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto, Japan.
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5
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Ogata Y, Fujieda Y, Oku K, Tsutsumi A. A case of Hashimoto's thyroiditis presented with heliotrope-like skin rash. Scand J Rheumatol 2022; 51:525-526. [PMID: 35658785 DOI: 10.1080/03009742.2022.2070971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Y Ogata
- Takikawa Municipal Hospital, Takikawa, Japan
| | - Y Fujieda
- Department of Rheumatology, Endocrinology, and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - K Oku
- Department of Rheumatology and Infectious Diseases, Kitasato University School of Medicine, Sagamihara, Japan
| | - A Tsutsumi
- Takikawa Municipal Hospital, Takikawa, Japan
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6
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Kobayashi T, Tsutsumi A, Kurebayashi N, Saito K, Kodama M, Sakurai T, Kikkawa M, Murayama T, Ogawa H. Molecular basis for gating of cardiac ryanodine receptor explains the mechanisms for gain- and loss-of function mutations. Nat Commun 2022; 13:2821. [PMID: 35595836 PMCID: PMC9123176 DOI: 10.1038/s41467-022-30429-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [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: 11/20/2021] [Accepted: 04/28/2022] [Indexed: 12/12/2022] Open
Abstract
Cardiac ryanodine receptor (RyR2) is a large Ca2+ release channel in the sarcoplasmic reticulum and indispensable for excitation-contraction coupling in the heart. RyR2 is activated by Ca2+ and RyR2 mutations are implicated in severe arrhythmogenic diseases. Yet, the structural basis underlying channel opening and how mutations affect the channel remains unknown. Here, we address the gating mechanism of RyR2 by combining high-resolution structures determined by cryo-electron microscopy with quantitative functional analysis of channels carrying various mutations in specific residues. We demonstrated two fundamental mechanisms for channel gating: interactions close to the channel pore stabilize the channel to prevent hyperactivity and a series of interactions in the surrounding regions is necessary for channel opening upon Ca2+ binding. Mutations at the residues involved in the former and the latter mechanisms cause gain-of-function and loss-of-function, respectively. Our results reveal gating mechanisms of the RyR2 channel and alterations by pathogenic mutations at the atomic level. Ryanodine receptor 2 (RyR2) is a Ca2+ release channel essential for cardiac excitation-contraction coupling. Here, the authors use structural and functional analysis to reveal RyR2 gating mechanism and its alterations by pathogenic mutations.
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Affiliation(s)
- Takuya Kobayashi
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nagomi Kurebayashi
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kei Saito
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
| | - Masami Kodama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Takashi Sakurai
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takashi Murayama
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, Tokyo, Japan.
| | - Haruo Ogawa
- Department of Structural Biology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan.
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7
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Obata J, Kawakami N, Tsutsumi A, Nasu E, Miyamoto K, Kikkawa M, Arai R. Icosahedral 60-meric porous structure of designed supramolecular protein nanoparticle TIP60. Chem Commun (Camb) 2021; 57:10226-10229. [PMID: 34523636 DOI: 10.1039/d1cc03114g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Supramolecular protein nanoparticles and nanocages have potential in a broad range of applications. Recently, we developed a uniform supramolecular protein nanoparticle, TIP60, symmmetrically self-assembled from fusion proteins of a pentameric Sm-like protein and a dimeric MyoX-coil domain. Herein, we report the icosahedral 60-meric structure of TIP60 solved using single-particle cryo-electron microscopy. Interestingly, the structure revealed 20 regular-triangle-like pores on the surface. TIP60 and its mutants have many modifiable sites on their exterior and interior surfaces. The TIP60 architecture will be useful in the development of biomedical and biochemical nanoparticles/nanocages for future applications.
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Affiliation(s)
- Junya Obata
- Department of Biomolecular Innovation, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Ueda, Nagano 386-8567, Japan. .,Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan
| | - Norifumi Kawakami
- Department of Bioscience and Informatics, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Erika Nasu
- Department of Bioscience and Informatics, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
| | - Kenji Miyamoto
- Department of Bioscience and Informatics, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Ryoichi Arai
- Department of Biomolecular Innovation, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Ueda, Nagano 386-8567, Japan. .,Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano 386-8567, Japan
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8
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Zhang Y, Watanabe S, Tsutsumi A, Kadokura H, Kikkawa M, Inaba K. Cryo-EM analysis provides new mechanistic insight into ATP binding to Ca 2+ -ATPase SERCA2b. EMBO J 2021; 40:e108482. [PMID: 34459010 DOI: 10.15252/embj.2021108482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 12/31/2022] Open
Abstract
Sarco/endoplasmic reticulum Ca2+ -ATPase (SERCA) 2b is a ubiquitous SERCA family member that conducts Ca2+ uptake from the cytosol to the ER. Herein, we present a 3.3 Å resolution cryo-electron microscopy (cryo-EM) structure of human SERCA2b in the E1·2Ca2+ state, revealing a new conformation for Ca2+ -bound SERCA2b with a much closer arrangement of cytosolic domains than in the previously reported crystal structure of Ca2+ -bound SERCA1a. Multiple conformations generated by 3D classification of cryo-EM maps reflect the intrinsically dynamic nature of the cytosolic domains in this state. Notably, ATP binding residues of SERCA2b in the E1·2Ca2+ state are located at similar positions to those in the E1·2Ca2+ -ATP state; hence, the cryo-EM structure likely represents a preformed state immediately prior to ATP binding. Consistently, a SERCA2b mutant with an interdomain disulfide bridge that locks the closed cytosolic domain arrangement displayed significant autophosphorylation activity in the presence of Ca2+ . We propose a novel mechanism of ATP binding to SERCA2b.
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Affiliation(s)
- Yuxia Zhang
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Satoshi Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Akihisa Tsutsumi
- Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroshi Kadokura
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Masahide Kikkawa
- Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kenji Inaba
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
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9
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Takeda H, Tsutsumi A, Nishizawa T, Lindau C, Busto JV, Wenz LS, Ellenrieder L, Imai K, Straub SP, Mossmann W, Qiu J, Yamamori Y, Tomii K, Suzuki J, Murata T, Ogasawara S, Nureki O, Becker T, Pfanner N, Wiedemann N, Kikkawa M, Endo T. Mitochondrial sorting and assembly machinery operates by β-barrel switching. Nature 2021; 590:163-169. [PMID: 33408415 DOI: 10.1038/s41586-020-03113-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 11/09/2020] [Indexed: 01/06/2023]
Abstract
The mitochondrial outer membrane contains so-called β-barrel proteins, which allow communication between the cytosol and the mitochondrial interior1-3. Insertion of β-barrel proteins into the outer membrane is mediated by the multisubunit mitochondrial sorting and assembly machinery (SAM, also known as TOB)4-6. Here we use cryo-electron microscopy to determine the structures of two different forms of the yeast SAM complex at a resolution of 2.8-3.2 Å. The dimeric complex contains two copies of the β-barrel channel protein Sam50-Sam50a and Sam50b-with partially open lateral gates. The peripheral membrane proteins Sam35 and Sam37 cap the Sam50 channels from the cytosolic side, and are crucial for the structural and functional integrity of the dimeric complex. In the second complex, Sam50b is replaced by the β-barrel protein Mdm10. In cooperation with Sam50a, Sam37 recruits and traps Mdm10 by penetrating the interior of its laterally closed β-barrel from the cytosolic side. The substrate-loaded SAM complex contains one each of Sam50, Sam35 and Sam37, but neither Mdm10 nor a second Sam50, suggesting that Mdm10 and Sam50b function as placeholders for a β-barrel substrate released from Sam50a. Our proposed mechanism for dynamic switching of β-barrel subunits and substrate explains how entire precursor proteins can fold in association with the mitochondrial machinery for β-barrel assembly.
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Affiliation(s)
- Hironori Takeda
- Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-motoyama, Kyoto, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Tomohiro Nishizawa
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Caroline Lindau
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Jon V Busto
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Lena-Sophie Wenz
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Sanofi Deutschland GmbH, Frankfurt am Main, Germany
| | - Lars Ellenrieder
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Novartis Pharma AG, Basel, Switzerland
| | - Kenichiro Imai
- Molecular Profiling Research Center for Drug Discovery (molprof), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan.,Cellular and Molecular Biotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Sebastian P Straub
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Faculty of Biology, University of Freiburg, Freiburg, Germany.,Sanofi-Aventis (Suisse) ag, Vernier, Switzerland
| | - Waltraut Mossmann
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Jian Qiu
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany.,Institute of Molecular Precision Medicine and Hunan Key Laboratory of Molecular Precision Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Yu Yamamori
- Artificial Intelligence Research Center (AIRC), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Kentaro Tomii
- Artificial Intelligence Research Center (AIRC), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan.,AIST-Tokyo Tech Real World Big-Data Computation Open Innovation Laboratory (RWBC-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Junko Suzuki
- Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-motoyama, Kyoto, Japan
| | - Takeshi Murata
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, Japan
| | - Satoshi Ogasawara
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, Japan
| | - Osamu Nureki
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Thomas Becker
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.,Institute for Biochemistry and Molecular Biology, Faculty of Medicine, University of Bonn, Bonn, Germany
| | - Nikolaus Pfanner
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Nils Wiedemann
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany.,BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Toshiya Endo
- Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-motoyama, Kyoto, Japan. .,Institute for Protein Dynamics, Kyoto Sangyo University, Kamigamo-motoyama, Kyoto, Japan.
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10
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Matoba K, Kotani T, Tsutsumi A, Tsuji T, Mori T, Noshiro D, Sugita Y, Nomura N, Iwata S, Ohsumi Y, Fujimoto T, Nakatogawa H, Kikkawa M, Noda NN. Atg9 is a lipid scramblase that mediates autophagosomal membrane expansion. Nat Struct Mol Biol 2020; 27:1185-1193. [PMID: 33106658 DOI: 10.1038/s41594-020-00518-w] [Citation(s) in RCA: 215] [Impact Index Per Article: 53.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/15/2020] [Indexed: 12/15/2022]
Abstract
The molecular function of Atg9, the sole transmembrane protein in the autophagosome-forming machinery, remains unknown. Atg9 colocalizes with Atg2 at the expanding edge of the isolation membrane (IM), where Atg2 receives phospholipids from the endoplasmic reticulum (ER). Here we report that yeast and human Atg9 are lipid scramblases that translocate phospholipids between outer and inner leaflets of liposomes in vitro. Cryo-EM of fission yeast Atg9 reveals a homotrimer, with two connected pores forming a path between the two membrane leaflets: one pore, located at a protomer, opens laterally to the cytoplasmic leaflet; the other, at the trimer center, traverses the membrane vertically. Mutation of residues lining the pores impaired IM expansion and autophagy activity in yeast and abolished Atg9's ability to transport phospholipids between liposome leaflets. These results suggest that phospholipids delivered by Atg2 are translocated from the cytoplasmic to the luminal leaflet by Atg9, thereby driving autophagosomal membrane expansion.
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Affiliation(s)
- Kazuaki Matoba
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, Japan
| | - Tetsuya Kotani
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takuma Tsuji
- Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | | | | | - Yuji Sugita
- RIKEN Cluster for Pioneering Research, Wako, Japan
- RIKEN Center for Computational Science, Kobe, Japan
- RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- RIKEN SPring-8 Center, Hyogo, Japan
| | - Yoshinori Ohsumi
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
| | - Toyoshi Fujimoto
- Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hitoshi Nakatogawa
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nobuo N Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, Japan.
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11
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Matoba K, Kotani T, Tsutsumi A, Tsuji T, Mori T, Noshiro D, Sugita Y, Nomura N, Iwata S, Ohsumi Y, Fujimoto T, Nakatogawa H, Kikkawa M, Noda NN. Author Correction: Atg9 is a lipid scramblase that mediates autophagosomal membrane expansion. Nat Struct Mol Biol 2020; 27:1209. [PMID: 33184515 DOI: 10.1038/s41594-020-00538-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
- Kazuaki Matoba
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, Japan
| | - Tetsuya Kotani
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takuma Tsuji
- Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | | | | | - Yuji Sugita
- RIKEN Cluster for Pioneering Research, Wako, Japan.,RIKEN Center for Computational Science, Kobe, Japan.,RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,RIKEN SPring-8 Center, Hyogo, Japan
| | - Yoshinori Ohsumi
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan
| | - Toyoshi Fujimoto
- Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hitoshi Nakatogawa
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, Japan
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Nobuo N Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, Japan.
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12
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Zhang Y, Inoue M, Tsutsumi A, Watanabe S, Nishizawa T, Nagata K, Kikkawa M, Inaba K. Cryo-EM structures of SERCA2b reveal the mechanism of regulation by the luminal extension tail. Sci Adv 2020; 6:eabb0147. [PMID: 32851169 PMCID: PMC7423393 DOI: 10.1126/sciadv.abb0147] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 06/26/2020] [Indexed: 06/02/2023]
Abstract
Sarco/endoplasmic reticulum Ca2+ ATPase (SERCA) pumps Ca2+ from the cytosol into the ER and maintains the cellular calcium homeostasis. Herein, we present cryo-electron microscopy (cryo-EM) structures of human SERCA2b in E1∙2Ca2+-adenylyl methylenediphosphonate (AMPPCP) and E2-BeF3 - states at 2.9- and 2.8-Å resolutions, respectively. The structures revealed that the luminal extension tail (LE) characteristic of SERCA2b runs parallel to the lipid-water boundary near the luminal ends of transmembrane (TM) helices TM10 and TM7 and approaches the luminal loop flanked by TM7 and TM8. While the LE served to stabilize the cytosolic and TM domain arrangement of SERCA2b, deletion of the LE rendered the overall conformation resemble that of SERCA1a and SERCA2a and allowed multiple conformations. Thus, the LE appears to play a critical role in conformational regulation in SERCA2b, which likely explains the different kinetic properties of SERCA2b from those of other isoforms lacking the LE.
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Affiliation(s)
- Yuxia Zhang
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Michio Inoue
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
- Core Research for Evolutional Science and Technology (CREST), Kawaguchi, Japan
| | - Akihisa Tsutsumi
- Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Satoshi Watanabe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
- Core Research for Evolutional Science and Technology (CREST), Kawaguchi, Japan
| | - Tomohiro Nishizawa
- Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kazuhiro Nagata
- Core Research for Evolutional Science and Technology (CREST), Kawaguchi, Japan
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - Masahide Kikkawa
- Core Research for Evolutional Science and Technology (CREST), Kawaguchi, Japan
- Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kenji Inaba
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
- Core Research for Evolutional Science and Technology (CREST), Kawaguchi, Japan
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13
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Watanabe K, Sakuraya A, Kawakami N, Imamura K, Ando E, Asai Y, Eguchi H, Kobayashi Y, Nishida N, Arima H, Shimazu A, Tsutsumi A. Work-related psychosocial factors and metabolic syndrome onset among workers: a systematic review and meta-analysis. Obes Rev 2018; 19:1557-1568. [PMID: 30047228 DOI: 10.1111/obr.12725] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/14/2018] [Accepted: 05/31/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Work-related psychosocial factors have been associated with metabolic syndrome. However, no systematic reviews or meta-analyses have evaluated this association. METHODS A systematic literature search was conducted, using PubMed, Embase, PsycINFO, PsycARTICLES and the Japan Medical Abstracts Society. Eligible studies included those that examined the previously mentioned association; had a longitudinal or prospective cohort design; were conducted among workers; provided sufficient data for calculating odds ratios, relative risks or hazard ratios with 95% confidence intervals; were original articles in English or Japanese; and were published no later than 2016. Study characteristics, exposure and outcome variables and association measures of studies were extracted by the investigators independently. RESULTS Among 4,664 identified studies, 8 were eligible for review and meta-analysis. The pooled risk of adverse work-related stress on metabolic syndrome onset was significant and positive (RR = 1.47; 95% CI, 1.22-1.78). Sensitivity analyses limiting only the effects of job strain and shift work also indicated a significant positive relationship (RR = 1.75; 95% CI, 1.09-2.79; and RR = 1.59; 95% CI, 1.00-2.54, P = 0.049 respectively). CONCLUSION This study reveals a strong positive association between work-related psychosocial factors and an elevated risk of metabolic syndrome onset. The effects of job strain and shift work on metabolic syndrome appear to be significant.
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Affiliation(s)
- K Watanabe
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - A Sakuraya
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Kawakami
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K Imamura
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - E Ando
- Department of Social and Environmental Health, Division of Environmental Medicine and Population Sciences, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Y Asai
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Eguchi
- Department of Public Health, Kitasato University School of Medicine, Sagamihara-shi, Kanagawa, Japan
| | | | - N Nishida
- Kyoto Industrial Health Association, Kyoto, Japan
| | - H Arima
- Department of Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - A Shimazu
- Center for Human and Social Sciences, Kitasato University College of Liberal Arts and Sciences, Sagamihara-shi, Kanagawa, Japan
| | - A Tsutsumi
- Department of Public Health, Kitasato University School of Medicine, Sagamihara-shi, Kanagawa, Japan
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14
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Hiramoto E, Tsutsumi A, Suzuki R, Matsuoka S, Arai S, Kikkawa M, Miyazaki T. The IgM pentamer is an asymmetric pentagon with an open groove that binds the AIM protein. Sci Adv 2018; 4:eaau1199. [PMID: 30324136 PMCID: PMC6179379 DOI: 10.1126/sciadv.aau1199] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 08/31/2018] [Indexed: 05/09/2023]
Abstract
Soluble immunoglobulin M (IgM) forms a pentamer containing a joining (J) chain polypeptide. While IgM pentamer has various immune functions, it also behaves as a carrier of circulating apoptosis inhibitor of macrophage (AIM; also called CD5L) protein that facilitates repair during different diseases. AIM binds to the IgM pentamer solely in the presence of the J chain. Here, using a single-particle negative-stain electron microscopy, we found that the IgM pentamer exhibits an asymmetric pentagon containing one large gap, which is markedly different from the textbook symmetric pentagon model. A single AIM molecule specifically fits into the gap, cross-bridging two IgM-Fc that form the edges of the gap through a disulfide bond at one side and a charge-based interaction at the other side. The discovery of the bona fide shape of the IgM pentamer advances our structural understanding of the pentameric IgM and its binding mode with AIM.
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Affiliation(s)
- Emiri Hiramoto
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Akihisa Tsutsumi
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Risa Suzuki
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Shigeru Matsuoka
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
- Corresponding author. (T.M.); (S.A.)
| | - Satoko Arai
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
- Corresponding author. (T.M.); (S.A.)
| | - Masahide Kikkawa
- Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Toru Miyazaki
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
- AMED-CREST, Japan Agency for Medical Research and Development, Tokyo, Japan
- Max Planck–The University of Tokyo Center for Integrative Inflammology, Tokyo, Japan
- Corresponding author. (T.M.); (S.A.)
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15
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Kasuya G, Nakane T, Yokoyama T, Jia Y, Inoue M, Watanabe K, Nakamura R, Nishizawa T, Kusakizako T, Tsutsumi A, Yanagisawa H, Dohmae N, Hattori M, Ichijo H, Yan Z, Kikkawa M, Shirouzu M, Ishitani R, Nureki O. Cryo-EM structures of the human volume-regulated anion channel LRRC8. Nat Struct Mol Biol 2018; 25:797-804. [DOI: 10.1038/s41594-018-0109-6] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 07/11/2018] [Indexed: 12/31/2022]
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16
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Tsutsumi A, Kajiki S, Muto T, Shimazu A, Okahara S, Ohdo K, Yoshikawa T, Mishiba T, Inoue A. 1152 Collecting and organising basic occupational health data for international comparisons. Epidemiology 2018. [DOI: 10.1136/oemed-2018-icohabstracts.380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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17
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Kawakami N, Imamura K, Asai Y, Watanabe K, Tsutsumi A, Shimazu A, Inoue A, Hiro H, Odagiri Y, Yoshikawa T, Yoshikawa E. 1211 The stress check program: an evaluation of the first-year implementation of the new national workplace mental health program in japan. Health Serv Res 2018. [DOI: 10.1136/oemed-2018-icohabstracts.444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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18
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Abstract
The relationship between presence of anti-β2-glycoprotein I autoantibodies (aβ2-GPI) and history of thrombosis is now widely known. However, differences in the methodology of aβ2-GPI detection have made the comparison of data from different laboratories extremely difficult. We discuss the significance of aβ2-GPI of the IgG, IgM and IgA isotypes, and our approach to developing an easier and more reproducible method for the detection of this autoantibody. In addition, we present data that shows that commercially available enzyme immunoassay plates differ regarding detectability of aβ2-GPI. Since the clinical significance of this heterogeneity is presently unclear, the set-up of the detection systems and interpretation of data need great care.
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Affiliation(s)
- A Tsutsumi
- Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Okayama University Medical School, Okayama, Japan
| | - K Ichikawa
- Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Okayama University Medical School, Okayama, Japan
| | - E Matsuura
- Department of Cell Chemistry, Institute of Molecular and Cellular Biology, Okayama University Medical School, Okayama, Japan
| | - T Koike
- Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Okayama University Medical School, Okayama, Japan
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19
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Izutsu T, Tsutsumi A, Sato T, Naqibullah Z, Wakai S, Kurita H. Nutritional and Mental Health Status of Afghan Refugee Children in Peshawar, Pakistan: A Descriptive Study. Asia Pac J Public Health 2016; 17:93-8. [PMID: 16425652 DOI: 10.1177/101053950501700206] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The study sought to ascertain and describe the physical and mental health states of Afghan refugee children after the terrorist attack on September 11, 2001 in the US and the aerial bombing of Afghanistan that followed. A cross-sectional survey was carried out in four refugee camps in Peshawar, Pakistan from February to March 2002, and comparisons among camps were made. A total of 70 males (mean age SD = 9.81 ±1.98 years old) and 30 females (7.94 ±2.07) answered a self-developed questionnaire on demographic data, traumatic events experience, living environment in the camps, and physical and mental health, through interviews. Anthropometric measures were measured and physical symptoms including anaemia and edema were assessed. Severe malnutrition was not shown and there were no significant differences in most nutritional and physical states among the camps. Nevertheless, in the newer camps more children experienced war related traumatic events. Mental symptoms were prevalent in all camps, though the characteristics of the symptoms differed among the camps. Asia Pac J Public Health 2005; 17(2): 93-98.
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Affiliation(s)
- T Izutsu
- Department of Forensic Psychiatry, National Institute of Mental Health, National Center of Neurology and Psychiatry, 1-7-3, Kohnodai, Ichikawa, Chiba 272-0827, Japan.
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20
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Abstract
Novel Rh-substituted hexaaluminate catalysts were prepared for the first time for N2O decomposition as a green propellant.
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Affiliation(s)
- R. Amrousse
- JAXA, Japan Aerospace Exploration Agency
- Sagamihara
- Japan
| | - A. Tsutsumi
- JAXA, Japan Aerospace Exploration Agency
- Sagamihara
- Japan
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21
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Abstract
BACKGROUND The association between overtime and depression is unclear and very few studies have examined the association between heavy overtime work, i.e. working more than 60 h per week, and depression. AIMS To examine the association between heavy overtime work and the onset of depressive disorder among male workers. METHODS A 1-year follow-up cohort study of male workers in a manufacturing company in Japan, between 2008 and 2009. Working hours, depressive disorder, assessed by the Center for Epidemiologic Studies Depression (CES-D) Scale (score ≥16 points), and covariates were measured at baseline and at follow-up. Participants who had depressive disorder at baseline were excluded. RESULTS At follow-up, 1194 participants aged between 18 and 71 years were analysed. Multiple logistic regression analysis revealed that the odds ratio for the new onset of depressive disorder was 4.5 (95% CI 1.8-11.1) times higher for employees working >60 h per week than for those working ≤50 h per week, when adjusted for age, lifestyle factors, work-related characteristics and socio-demographic characteristics at baseline and working hours at follow-up. However, the correlation between working 50.1 to 60 h per week and depressive disorder was not significant. The trend test of depressive disorder among groups by working hours was significant (P < 0.01). CONCLUSIONS Heavy overtime work is a risk factor for the new onset of depressive disorder in this population of male workers. Working >60 h per week may be the cut-off to screen for high-risk groups who need preventive action against depressive disorder.
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Affiliation(s)
- R Kato
- Department of Public Health, Dokkyo Medical University School of Medicine, Tochigi 321-0293, Japan,
| | - Y Haruyama
- Department of Public Health, Dokkyo Medical University School of Medicine, Tochigi 321-0293, Japan
| | - M Endo
- Department of Public Health, Dokkyo Medical University School of Medicine, Tochigi 321-0293, Japan
| | - A Tsutsumi
- Department of Public Health, Kitasato University School of Medicine, Kanagawa 252-0374, Japan
| | - T Muto
- Department of Public Health, Dokkyo Medical University School of Medicine, Tochigi 321-0293, Japan
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22
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Adachi Y, Tsutsumi A, Murata H, Takemura H, Chino Y, Takahashi R, Ebitsuka T, Sumida T. Behçet's disease accompanied by myelodysplastic syndrome with trisomy 8: two case reports and a review of 15 Japanese cases. Mod Rheumatol 2014; 13:90-4. [PMID: 24387124 DOI: 10.3109/s101650300015] [Citation(s) in RCA: 8] [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: 11/13/2022]
Abstract
Abstract We describe two cases of Behçet's disease associated with myelodysplastic syndrome (MDS) with trisomy 8. Both cases developed ulceration in the cecum as a gastrointestinal complication of Behçet's disease, after a diagnosis of MDS. We summarized recent case reports of Behçet's disease associated with myelodysplastic syndrome, and studied the clinical manifestations. Most cases showed trisomy 8 as a chromosomal abnormality. Gastrointestinal involvement without eye lesions seems to be characteristic of Behçet's disease associated with MDS.
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Affiliation(s)
- Y Adachi
- Division of Rheumatology, Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba , 1-1-1 Tennodai, Tsukuba 305-8575 , Japan
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23
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Yamagishi M, Nakano K, Miyake A, Yamochi T, Kagami Y, Tsutsumi A, Matsuda Y, Sato-Otsubo A, Muto S, Utsunomiya A, Yamaguchi K, Uchimaru K, Ogawa S, Watanabe T. Polycomb-mediated loss of miR-31 activates NIK-dependent NF-κB pathway in adult T cell leukemia and other cancers. Cancer Cell 2012; 21:121-35. [PMID: 22264793 DOI: 10.1016/j.ccr.2011.12.015] [Citation(s) in RCA: 214] [Impact Index Per Article: 17.8] [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: 11/03/2010] [Revised: 08/12/2011] [Accepted: 12/19/2011] [Indexed: 01/08/2023]
Abstract
Constitutive NF-κB activation has causative roles in adult T cell leukemia (ATL) caused by HTLV-1 and other cancers. Here, we report a pathway involving Polycomb-mediated miRNA silencing and NF-κB activation. We determine the miRNA signatures and reveal miR-31 loss in primary ATL cells. MiR-31 negatively regulates the noncanonical NF-κB pathway by targeting NF-κB inducing kinase (NIK). Loss of miR-31 therefore triggers oncogenic signaling. In ATL cells, miR-31 level is epigenetically regulated, and aberrant upregulation of Polycomb proteins contribute to miR-31 downregulation in an epigenetic fashion, leading to activation of NF-κB and apoptosis resistance. Furthermore, this emerging circuit operates in other cancers and receptor-initiated NF-κB cascade. Our findings provide a perspective involving the epigenetic program, inflammatory responses, and oncogenic signaling.
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Affiliation(s)
- Makoto Yamagishi
- Graduate School of Frontier Sciences, The University of Tokyo, Japan
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Yamagishi M, Nakano K, Yamochi T, Miyake A, Kagami Y, Tsutsumi A, Otsubo A, Ogawa S, Utsunomiya A, Yamaguchi K, Uchimaru K, Watanabe T. Genetic and epigenetic loss of miR-31 activates NIK-dependent NF-κB pathway in Adult T-cell Leukemia. Retrovirology 2011. [PMCID: PMC3112596 DOI: 10.1186/1742-4690-8-s1-a128] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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25
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Aziz M, Fushimi C, Kansha Y, Mochidzuki K, Kaneko S, Tsutsumi A, Matsumoto K, Hashimoto T, Kawamoto N, Oura K, Yokohama K, Yamaguchi Y, Kinoshita M. Innovative Energy-Efficient Biomass Drying Based on Self-Heat Recuperation Technology. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201100065] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Ota A, Masue T, Yasuda N, Tsutsumi A, Mino Y, Ohara H, Ono Y. Psychosocial job characteristics and smoking cessation: A prospective cohort study using the Demand-Control-Support and Effort-Reward Imbalance job stress models. Nicotine Tob Res 2010; 12:287-93. [DOI: 10.1093/ntr/ntp212] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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27
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Wang Y, Ito S, Chino Y, Goto D, Matsumoto I, Murata H, Tsutsumi A, Hayashi T, Uchida K, Usui J, Yamagata K, Sumida T. Laser microdissection-based analysis of cytokine balance in the kidneys of patients with lupus nephritis. Clin Exp Immunol 2009; 159:1-10. [PMID: 19807734 DOI: 10.1111/j.1365-2249.2009.04031.x] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
To determine the cytokine balance in patients with lupus nephritis (LN), we analysed kidney-infiltrating T cells. Renal biopsy samples from 15 systemic lupus erythematosus (SLE) patients were used. In accordance with the classification of International Society of Nephrology/Renal Pathology Society, they were categorized into Class III, Class III+V (Class III-predominant group, n = 4), Class IV, Class IV+V (Class IV-predominant group, n = 7) and Class V (n = 4) groups. The single-cell samples of both the glomelular and interstitial infiltrating cells were captured by laser-microdissection. The glomerular and interstitial infiltrating T cells produced interleukin (IL)-2, IL-4, IL-10, IL-13 and IL-17 cytokines in the Class III-predominant, Class IV-predominant and Class V groups. Interferon-gamma was detected only in the glomeruli of the Class III-predominant and Class V group samples. The expression level of IL-17 was correlated closely with clinical parameters such as haematuria, blood urea nitrogen level, SLE Disease Activity Index scores in both glomeruli and interstitium, urine protein level in glomeruli and serum creatinine and creatinine clearance levels in interstitium. This suggests that the glomerular infiltrating T cells might act as T helper type 1 (Th1), Th2 and Th17 cells while the interstitial infiltrating T cells, act as Th2 and Th17 cells in the Class III-predominant and Class V groups. In contrast, both the glomerular and interstitial infiltrating T cells might act as Th2 and Th17 cells in the Class IV-predominant group. The cytokine balances may be dependent upon the classification of renal pathology, and IL-17 might play a critical role in SLE development.
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Affiliation(s)
- Y Wang
- Division of Clinical Immunology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tennodai, Tsukuba, Japan
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Ito I, Kawasaki A, Ito S, Kondo Y, Sugihara M, Horikoshi M, Hayashi T, Goto D, Matsumoto I, Tsutsumi A, Takasaki Y, Hashimoto H, Matsuta K, Sumida T, Tsuchiya N. Replication of association between FAM167A(C8orf13)-BLK region and rheumatoid arthritis in a Japanese population. Ann Rheum Dis 2009; 69:936-7. [DOI: 10.1136/ard.2009.118760] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Tanaka-Watanabe Y, Matsumoto I, Iwanami K, Inoue A, Goto D, Ito S, Tsutsumi A, Sumida T. B cells play a crucial role as antigen-presenting cells and collaborate with inflammatory cytokines in glucose-6-phosphate isomerase-induced arthritis. Clin Exp Immunol 2008; 155:285-94. [PMID: 19032549 DOI: 10.1111/j.1365-2249.2008.03816.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Anti-glucose-6-phosphate isomerase (GPI) antibodies from K/BxN mice directly induce arthritis; however, the transfer of these antibodies from mice with GPI-induced arthritis does not induce arthritis. CD4(+) T cells play an important role in the induction and effector phase in this model; however, the roles of B cells and immunoglobulins (Igs) have not been elucidated. We investigated the roles of B cells and Igs in GPI-induced arthritis by using adoptive transfer system into SCID mice. Transfer of splenocytes of male DBA/1 mice immunized with GPI into SCID mice induced arthritis on day 6 in the latter, in association with the production of anti-GPI antibodies. Co-localization of C3 and IgG on the articular surface was identified in arthritic SCID mice. Inoculation of IgG (or anti-GPI antibodies) and CD19(+)-depleted splenocytes from arthritic DBA/1 mice induced arthritis in SCID mice, but not CD19(+)-depleted or CD4(+)-depleted splenocytes from DBA/1 mice. In vitro analysis of cytokine production by splenocytes from DBA/1 arthritic mice demonstrated production of large amounts of tumour necrosis factor (TNF)-alpha and interleukin (IL)-6 in an antigen-specific manner (P < 0.01), and production was dominated by CD19(+)-depleted than CD4(+)-depleted splenocytes (P < 0.05). Addition of IgG from DBA/1 arthritic mice to the culture enhanced TNF-alpha but not IL-6 production, and this effect was blocked by anti-Fcgamma receptor antibody. In vivo analysis of neutralization with TNF-alpha protected arthritis completely in SCID mice. Our results highlight the important role of B cells in GPI-induced arthritis as autoantibody producers, and these autoantibodies can trigger joint inflammation in orchestration with inflammatory cytokines, especially TNF-alpha.
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Affiliation(s)
- Y Tanaka-Watanabe
- Division of Clinical Immunology, Major of Advanced Biomedical Applications, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tennodai, Tsukuba, Japan
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Yoshiga Y, Goto D, Segawa S, Ohnishi Y, Matsumoto I, Ito S, Tsutsumi A, Taniguchi M, Sumida T. Invariant NKT cells produce IL-17 through IL-23-dependent and -independent pathways with potential modulation of Th17 response in collagen-induced arthritis. Int J Mol Med 2008; 22:369-374. [PMID: 18698497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
Invariant natural killer T (iNKT) cells play a protective role in the development of certain autoimmune diseases. However, their precise role in the pathogenesis of autoimmune arthritis remains unclear. In this study, we examined the possible contribution of iNKT cells in collagen-induced arthritis (CIA) by using iNKT cell-deficient mice (Jalpha281-/- mice). CIA in these mice was markedly suppressed and interleukin (IL)-17 production was reduced in a native type II collagen (CII)-specific T cell response. Draining lymph nodes of CII-immunized Jalpha281-/- mice contained a significantly low number of IL-17-producing T helper cells. To determine whether iNKT cells produce IL-17, we measured IL-17 by enzyme-linked immunosorbent assay in iNKT cells stimulated with the ligand, alpha-galactosylceramide (alpha-GalCer). Notably, splenocytes from Jalpha281-/- mice stimulated in this way were negative for IL-17, whereas those from C57BL/6 mice produced IL-17. Immunostaining for IL-17 in iNKT cells confirmed intracellular staining of the protein. RT-PCR analysis showed that iNKT cells expressed retinoid-related orphan receptor gammaT and IL-23 receptor. Moreover, cell sorting demonstrated that NK1.1- iNKT cells were the main producers of IL-17 compared with NK1.1+ iNKT cells. IL-17 production by iNKT cells was induced by IL-23-dependent and -independent pathways, since iNKT produced IL-17 when stimulated with either IL-23 or alpha-GalCer alone. Our findings indicate that iNKT cells are producers and activators of IL-17 via IL-23- dependent and -independent pathways, suggesting that they are key cells in the pathogenesis of CIA through IL-17.
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Affiliation(s)
- Y Yoshiga
- Division of Clinical Immunology, Major of Advanced Biomedical Applications, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
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Kobayashi K, Tada K, Itabe H, Ueno T, Liu PH, Tsutsumi A, Kuwana M, Yasuda T, Shoenfeld Y, de Groot PG, Matsuura E. Distinguished effects of antiphospholipid antibodies and anti-oxidized LDL antibodies on oxidized LDL uptake by macrophages. Lupus 2008; 16:929-38. [PMID: 18042586 DOI: 10.1177/0961203307084170] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Several interpretations have been made regarding the specificity of antiphospholipid antibodies and antibodies against oxidized low-density lipoprotein (oxLDL), but these are still controversial. In the present study, we delineated specificity of these two types of antibodies and analyzed their regulatory effect on oxLDL and/or beta( 2)-glycoprotein I (beta(2)GPI) binding to macrophages. Scavenger receptor-mediated binding of oxLDL (or its beta(2)GPI complexes) to macrophages was observed and the binding was partly prevented by beta( 2)GPI. The IgG monoclonal anti-beta(2)GPI antibody (WB-CAL-1), which was derived from NZW x BXSB F1 mouse (a model of antiphospholipid syndrome), significantly increased the oxLDL/beta(2)GPI binding to macrophages. In contrast, IgM anti-oxLDL natural antibody, EO6 (derived from apoe( -/-) mouse), prevented the binding. Different antigenic specificity of these antibodies to oxLDL and its beta(2)GPI complexes was also confirmed in TLC-ligand blot and ELISA. Thus, IgG anti-beta(2) GPI autoantibodies contribute to lipid metabolism (housekeeping of oxLDL by macrophages) whereas IgM natural anti-oxLDL antibodies may protect against atherogenesis. In addition, in vitro data suggest that relatively high dose of intravenous immunoglobulin preparations (mainly contain IgG anti-oxLDL antibodies) might also prevent atherogenesis by inhibiting the oxLDL binding to macrophages.
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Affiliation(s)
- K Kobayashi
- Department of Cell Chemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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Matsui H, Tsutsumi A, Sugihara M, Suzuki T, Iwanami K, Kohno M, Goto D, Matsumoto I, Ito S, Sumida T. Visfatin (pre-B cell colony-enhancing factor) gene expression in patients with rheumatoid arthritis: Figure 1. Ann Rheum Dis 2008; 67:571-2. [DOI: 10.1136/ard.2007.077578] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Nakamura Y, Wakamatsu E, Matsumoto I, Tomiita M, Kohno Y, Mori M, Yokota S, Goto D, Ito S, Tsutsumi A, Sumida T. High prevalence of autoantibodies to muscarinic-3 acetylcholine receptor in patients with juvenile-onset Sjogren syndrome. Ann Rheum Dis 2008; 67:136-7. [DOI: 10.1136/ard.2007.072421] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Affiliation(s)
- H. Y. Lin
- Department of Chemical System Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - W. Chen
- Department of Chemical System Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - A. Tsutsumi
- Department of Chemical System Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Ota A, Masue T, Yasuda N, Tsutsumi A, Mino Y, Ohara H. L0006 Null relationship between previous overcommitment to work and the future onset of insomnia among middle-aged workers: results from a prospective cohort study. Sleep Med 2007. [DOI: 10.1016/s1389-9457(07)70376-3] [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: 11/28/2022]
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Affiliation(s)
- J Freire-Moar
- Department of Molecular Immunology, Syntex Research, Palo Alto, California 94303
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Affiliation(s)
- A. Tsutsumi
- a Service de Chimie Physique, C.E.N. de Saclay , B.P. No. 2, 91190 , Gif-sur-Yvette , France
- b Department of Polymer Science , Faculty of Science, Hokkaido University , Sapporo , 060 , Japan
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38
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Kori Y, Matsumoto I, Zhang H, Yasukochi T, Hayashi T, Iwanami K, Goto D, Ito S, Tsutsumi A, Sumida T. Characterisation of Th1/Th2 type, glucose-6-phosphate isomerase reactive T cells in the generation of rheumatoid arthritis. Ann Rheum Dis 2006; 65:968-9. [PMID: 16769785 PMCID: PMC1798208 DOI: 10.1136/ard.2005.045286] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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39
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Naito Y, Matsumoto I, Wakamatsu E, Goto D, Ito S, Tsutsumi A, Sumida T. Altered peptide ligands regulate muscarinic acetylcholine receptor reactive T cells of patients with Sjögren's syndrome. Ann Rheum Dis 2006; 65:269-71. [PMID: 16410534 PMCID: PMC1798016 DOI: 10.1136/ard.2005.039065] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Y Naito
- Department of Internal Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba City, Ibaraki 305-8575, Japan
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Ohnishi Y, Tsutsumi A, Goto D, Itoh S, Matsumoto I, Taniguchi M, Sumida T. TCR Valpha14 natural killer T cells function as effector T cells in mice with collagen-induced arthritis. Clin Exp Immunol 2005; 141:47-53. [PMID: 15958069 PMCID: PMC1809413 DOI: 10.1111/j.1365-2249.2005.02817.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Natural killer (NK) T cells are a unique, recently identified cell population and are suggested to act as regulatory cells in autoimmune disorders. In the present study, designed to investigate the role of NKT cells in arthritis development, we attempted to induce arthritis by immunization of type II collagen (CIA) in Jalpha281 knock out (NKT-KO) and CD1d knock out (CD1d-KO) mice, which are depleted of NKT cells. From the results, the incidence of arthritis (40%) and the arthritis score (1.5 +/- 2.2 and 2.0 +/- 2.7) were reduced in NKT-KO and CD1d-KO mice compared to those in respective wild type mice (90%, 5.4 +/- 3.2 and 2.0 +/- 2.7, P < 0.01). Anti-CII antibody levels in the sera of NKT-KO and CD1d-KO mice were significantly decreased compared to the controls (OD values; 0.32 +/- 0.16 and 0.29 +/- 0.06 versus 0.58 +/- 0.08 and 0.38 +/- 0.08, P < 0.01). These results suggest that NKT cells play a role as effector T cells in CIA. Although the cell proliferative response and cytokine production in NKT-KO mice after the primary immunization were comparable to those in wild type mice, the ratios of both activated T or B cells were lower in NKT-KO mice than wild type mice after secondary immunization (T cells: 9.9 +/- 1.8% versus 16.0 +/- 3.4%, P < 0.01, B cells: 4.1 +/- 0.5% versus 5.1 +/- 0.7%, P < 0.05), suggesting that inv-NKT cells contribute to the pathogenicity in the development phase of arthritis. In addition, IL-4 and IL-1beta mRNA expression levels in the spleen during the arthritis development phase were lower in NKT-KO mice, while the IFN-gamma mRNA expression level was temporarily higher. These results suggest that inv-NKT cells influence cytokine production in arthritis development. In conclusion, inv-NKT cells may promote the generation of arthritis, especially during the development rather than the initiation phase.
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Affiliation(s)
- Y Ohnishi
- Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
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41
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Naito Y, Matsumoto I, Wakamatsu E, Goto D, Sugiyama T, Matsumura R, Ito S, Tsutsumi A, Sumida T. Muscarinic acetylcholine receptor autoantibodies in patients with Sjögren's syndrome. Ann Rheum Dis 2005; 64:510-1. [PMID: 15708912 PMCID: PMC1755406 DOI: 10.1136/ard.2004.025478] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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42
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Takahashi R, Tsutsumi A, Ohtani K, Muraki Y, Goto D, Matsumoto I, Wakamiya N, Sumida T. Association of mannose binding lectin (MBL) gene polymorphism and serum MBL concentration with characteristics and progression of systemic lupus erythematosus. Ann Rheum Dis 2005; 64:311-4. [PMID: 15647440 PMCID: PMC1755352 DOI: 10.1136/ard.2003.020172] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To determine whether occurrence, characteristics, and progression of systemic lupus erythematosus (SLE) are associated with polymorphism of the mannose binding lectin (MBL) gene and with serum MBL concentration. METHODS Codon 54 MBL gene polymorphism of 147 patients with SLE and 160 healthy controls was determined by polymerase chain reaction-restriction fragment length polymorphism. Serum concentration of MBL was measured by enzyme immunoassay. Fluctuations of serum MBL were analysed with respect to disease characteristics and activity. RESULTS Frequency of homozygosity for codon 54 minority allele was 6% (9/147) in patients with SLE, and significantly higher than in controls (p = 0.0294, Fisher's exact test). MBL polymorphism in patients with SLE was not significantly associated with disease characteristics or immunological phenotypes. Patients homozygous for the B allele tended to have a higher risk of infection during treatment. Levels of C3 and CH(50) were slightly, but significantly, associated with serum MBL concentration in patients with SLE homozygous for the majority allele. During the course of SLE, serum MBL concentration increased in 6/14 patients, and decreased in 7 after initiation of immunosuppressive treatment. CONCLUSIONS MBL gene polymorphism influences susceptibility to SLE, but has no direct effect on disease characteristics. Serum MBL levels fluctuate during the course of SLE in individual patients. MBL genotyping may be useful in assessing the risk of infection during treatment of SLE.
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Affiliation(s)
- R Takahashi
- Division of Rheumatology, Department of General Medicine, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-city, Ibaraki 305-8575, Japan
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Takahashi R, Tsutsumi A, Ohtani K, Goto D, Matsumoto I, Ito S, Wakamiya N, Sumida T. Anti-mannose binding lectin antibodies in sera of Japanese patients with systemic lupus erythematosus. Clin Exp Immunol 2004; 136:585-90. [PMID: 15147364 PMCID: PMC1809046 DOI: 10.1111/j.1365-2249.2004.02477.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Mannose-binding lectin (MBL) is a key element in innate immunity with functions and structure similar to that of complement C1q. It has been reported that MBL deficiency is associated with occurrence of systemic lupus erythematosus (SLE). We hypothesized that anti-MBL antibodies, if present, would affect the occurrence or disease course of SLE, by reduction of serum MBL levels, interference of MBL functions, or binding to MBL deposited on various tissues. To address this hypothesis, we measured the concentration of anti-MBL antibodies in sera of 111 Japanese SLE patients and 113 healthy volunteers by enzyme immunoassay. The titres of anti-MBL antibodies in SLE patients were significantly higher than those in healthy controls. When the mean + 2 standard deviations of controls was set as the cut off point, individuals with titres of anti-MBL antibodies above this level were significantly more frequent in SLE patients (9 patients) than in controls (2 persons). One SLE patient had an extremely high titre of this antibody. No associations of titres of anti-MBL antibodies and (i) genotypes of MBL gene, (ii) concentrations of serum MBL, or (iii) disease characteristics of SLE, were apparent. Thus, we have confirmed that anti-MBL antibodies are indeed present in sera of some patients with SLE, but the significance of these autoantibodies in the pathogenesis of SLE remains unclear.
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Affiliation(s)
- R Takahashi
- Division of Rheumatology, Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba, Tsukuba-city, Japan
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Kawaguchi K, Yashima K, Koda M, Tsutsumi A, Kitaoka S, Andachi H, Hosoda A, Kishimoto Y, Shiota G, Ito H, Murawaki Y. Fhit expression in human gastric adenomas and intramucosal carcinomas: correlation with Mlh1 expression and gastric phenotype. Br J Cancer 2004; 90:672-7. [PMID: 14760383 PMCID: PMC2409597 DOI: 10.1038/sj.bjc.6601601] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The fragile histidine triad (FHIT) gene, encompassing the FRA3B fragile site at chromosome 3p14.2, is a candidate tumour suppressor gene involved in a variety of tumours, including gastric carcinomas. Recently, it has been reported that the FHIT gene may be a target of damage in some of mismatch-deficient tumours. To clarify further the role of the Fhit protein in gastric carcinogenesis, we investigated whether Fhit expression in early gastric neoplasia is associated with mismatch repair protein expression and cellular phenotype. Fhit, Mlh1 and phenotypic expression were evaluated immunohistochemically in 87 early gastric neoplasias, comprising 32 adenomas and 55 intramucosal carcinomas, resected by endoscopic mucosal resection therapy. Significant loss or reduction of Fhit expression was noted in four (12.5%) of the 32 adenomas and 21 (38.2%) of the 55 intramucosal carcinomas. The rate of abnormal Fhit expression was significantly higher in intramucosal carcinomas than in adenomas (P=0.021). Moreover, reduced Fhit expression was found to be significantly associated with loss of Mlh1 expression in early gastric neoplasia (P=0.0011). Furthermore, we also detected a significant association between reduced Fhit expression and gastric phenotype (P=0.0018). These results suggested that reduced Fhit expression occurs in the early stage of gastric carcinogenesis and could be correlated with a lack of Mlh1 expression and gastric phenotype.
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Affiliation(s)
- K Kawaguchi
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - K Yashima
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan. E-mail:
| | - M Koda
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - A Tsutsumi
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - S Kitaoka
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - H Andachi
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
- Division of Organ Pathology, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - A Hosoda
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - Y Kishimoto
- Division of Pharmacotherapeutics, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - G Shiota
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - H Ito
- Division of Organ Pathology, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
| | - Y Murawaki
- Division of Medicine and Clinical Science, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
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Tsuchiya K, Tsutsumi A, Nakayama H, Ishida S, Ohtsuka H, Umemoto M. Displacive phase transformations and magnetic properties in Ni-Mn-Ga ferromagnetic shape memory alloys. ACTA ACUST UNITED AC 2003. [DOI: 10.1051/jp4:20031028] [Citation(s) in RCA: 6] [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: 11/14/2022]
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46
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Yoshida K, Tsutsumi A, Ohnishi Y, Akimoto T, Murata H, Sumida T. T cell epitopes of prothrombin in patients with antiphospholipid syndrome. Ann Rheum Dis 2003; 62:905-6. [PMID: 12922970 PMCID: PMC1754661 DOI: 10.1136/ard.62.9.905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Ohnishi Y, Tsutsumi A, Sumida T. Antibodies to type II collagen and their association with HLA DR1 alleles in Japanese patients with rheumatoid arthritis. Mod Rheumatol 2003; 13:69-72. [DOI: 10.3109/s101650300010] [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]
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Ohnishi Y, Tsutsumi A, Sumida T. Antibodies to type II collagen and their association with HLA DR1 alleles in Japanese patients with rheumatoid arthritis. Mod Rheumatol 2003. [DOI: 10.1007/s101650300010] [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: 11/30/2022]
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Tsutsumi A, Ebitsuka T, Murata H, Takemura H, Sumida T. An HLA-B27-positive patient diagnosed with ulcerative colitis 15 years after the onset of arthropathy. Mod Rheumatol 2002; 12:349-53. [PMID: 24384006 DOI: 10.3109/s101650200063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract A 28-year-old woman had persistent pain of both hip joints since the age of 13 years. X-ray analysis showed destructive changes in both hip joints and ossification of sacroiliitic joints. The patient had mild diarrhea and slight abdominal pain for 8 years. Blood-stained stool was not noticed. Barium enema showed changes consistent with the diagnosis of ulcerative colitis (UC). Inflammatory bowel syndrome should be considered in patients with persistent coxitis, even in the absence of severe abdominal symptoms.
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Affiliation(s)
- A Tsutsumi
- Division of Rheumatology, Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba , 1-1-1 Tennodai, Tsukuba 305-8575 , Japan
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Horita T, Tsutsumi A, Takeda T, Yasuda S, Takeuchi R, Amasaki Y, Ichikawa K, Atsumi T, Koike T. Significance of magnetic resonance imaging in the diagnosis of nodular regenerative hyperplasia of the liver complicated with systemic lupus erythematosus: a case report and review of the literature. Lupus 2002; 11:193-6. [PMID: 11999886 DOI: 10.1191/0961203302lu164cr] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nodular regenerative hyperplasia of the liver (NRH), characterized by multiple hepatic nodules in the absence of fibrosis, is a rare but important complication of systemic lupus erythematosus (SLE) associated with non-cirrhotic portal hypertension. The diagnosis of NRH is based on the pathological examination, and radiological findings of NRH are poorly documented. We report a case of a 40-year-old woman with SLE complicated with NRH. Sixteen years after diagnosis of SLE, esophageal varices were incidentally found and diagnosis of portal hypertension due to NRH was made by magnetic resonance imaging (MRI) and confirmed by needle liver biopsy. Although MRI showed the lesions as significant nodules, neither computed tomography nor ultrasonography could demonstrate the nodules. However, serial MRI showed significant enlargement of the nodules for 2 years Because NRH may lead to portal hypertension with life-threatening variceral haemorrhage in patients with SLE, MRI is a useful, non-invasive examination to screen the patients for its presence and follow-up. We reviewed the literature regarding NRH in SLE and discuss the management of the affected patients.
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Affiliation(s)
- T Horita
- Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Japan.
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