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Amekura H, Chettah A, Narumi K, Chiba A, Hirano Y, Yamada K, Yamamoto S, Leino AA, Djurabekova F, Nordlund K, Ishikawa N, Okubo N, Saitoh Y. Latent ion tracks were finally observed in diamond. Nat Commun 2024; 15:1786. [PMID: 38413643 PMCID: PMC10899563 DOI: 10.1038/s41467-024-45934-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 02/08/2024] [Indexed: 02/29/2024] Open
Abstract
Injecting high-energy heavy ions in the electronic stopping regime into solids can create cylindrical damage zones called latent ion tracks. Although these tracks form in many materials, none have ever been observed in diamond, even when irradiated with high-energy GeV uranium ions. Here we report the first observation of ion track formation in diamond irradiated with 2-9 MeV C60 fullerene ions. Depending on the ion energy, the mean track length (diameter) changed from 17 (3.2) nm to 52 (7.1) nm. High resolution scanning transmission electron microscopy (HR-STEM) indicated the amorphization in the tracks, in which π-bonding signal from graphite was detected by the electron energy loss spectroscopy (EELS). Since the melting transition is not induced in diamond at atmospheric pressure, conventional inelastic thermal spike calculations cannot be applied. Two-temperature molecular dynamics simulations succeeded in the reproduction of both the track formation under MeV C60 irradiations and the no-track formation under GeV monoatomic ion irradiations.
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Affiliation(s)
- H Amekura
- National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0003, Japan.
| | - A Chettah
- Department of Physics, LGMM laboratory, University of 20 Août 1955-Skikda, BP 26, route d'El Hadaiek-Skikda, Skikda, 21000, Algeria
| | - K Narumi
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
| | - A Chiba
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
| | - Y Hirano
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
| | - K Yamada
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
| | - S Yamamoto
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
| | - A A Leino
- Department of Physics and Helsinki Institute of Physics, University of Helsinki, PO Box 43, FI-00014, Helsinki, Finland
| | - F Djurabekova
- Department of Physics and Helsinki Institute of Physics, University of Helsinki, PO Box 43, FI-00014, Helsinki, Finland
| | - K Nordlund
- Department of Physics and Helsinki Institute of Physics, University of Helsinki, PO Box 43, FI-00014, Helsinki, Finland
| | - N Ishikawa
- Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, 319-1195, Japan
| | - N Okubo
- Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, 319-1195, Japan
| | - Y Saitoh
- Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology (QST), Takasaki, Gumma, 370-1292, Japan
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2
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Terada N, Saitoh Y, Saito M, Yamada T, Kamijo A, Yoshizawa T, Sakamoto T. Recent Progress on Genetically Modified Animal Models for Membrane Skeletal Proteins: The 4.1 and MPP Families. Genes (Basel) 2023; 14:1942. [PMID: 37895291 PMCID: PMC10606877 DOI: 10.3390/genes14101942] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/11/2023] [Accepted: 10/12/2023] [Indexed: 10/29/2023] Open
Abstract
The protein 4.1 and membrane palmitoylated protein (MPP) families were originally found as components in the erythrocyte membrane skeletal protein complex, which helps maintain the stability of erythrocyte membranes by linking intramembranous proteins and meshwork structures composed of actin and spectrin under the membranes. Recently, it has been recognized that cells and tissues ubiquitously use this membrane skeletal system. Various intramembranous proteins, including adhesion molecules, ion channels, and receptors, have been shown to interact with the 4.1 and MPP families, regulating cellular and tissue dynamics by binding to intracellular signal transduction proteins. In this review, we focus on our previous studies regarding genetically modified animal models, especially on 4.1G, MPP6, and MPP2, to describe their functional roles in the peripheral nervous system, the central nervous system, the testis, and bone formation. As the membrane skeletal proteins are located at sites that receive signals from outside the cell and transduce signals inside the cell, it is necessary to elucidate their molecular interrelationships, which may broaden the understanding of cell and tissue functions.
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Affiliation(s)
- Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano 390-8621, Japan
| | - Yurika Saitoh
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano 390-8621, Japan
- Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo 120-0045, Japan
| | - Masaki Saito
- School of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan;
| | - Tomoki Yamada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano 390-8621, Japan
| | - Akio Kamijo
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano 390-8621, Japan
- Division of Basic & Clinical Medicine, Nagano College of Nursing, Komagane City, Nagano 399-4117, Japan
| | - Takahiro Yoshizawa
- Division of Animal Research, Research Center for Advanced Science and Technology, Shinshu University, Matsumoto City, Nagano 390-8621, Japan
| | - Takeharu Sakamoto
- Department of Cancer Biology, Institute of Biomedical Science, Kansai Medical University, Hirakata City, Osaka 573-1010, Japan
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3
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Yamada T, Saitoh Y, Kametani K, Kamijo A, Sakamoto T, Terada N. Involvement of membrane palmitoylated protein 2 (MPP2) in the synaptic molecular complex at the mouse cerebellar glomerulus. Histochem Cell Biol 2022; 158:497-511. [PMID: 35854144 DOI: 10.1007/s00418-022-02137-6] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2022] [Indexed: 11/30/2022]
Abstract
We previously reported that the membrane skeletal protein 4.1G in the peripheral nervous system transports membrane palmitoylated protein 6 (MPP6), which interacts with the synaptic scaffolding protein Lin7 and cell adhesion molecule 4 (CADM4) in Schwann cells that form myelin. In the present study, we investigated the localization of and proteins related to MPP2, a highly homologous family protein of MPP6, in the cerebellum of the mouse central nervous system, in which neurons are well organized. Immunostaining for MPP2 was observed at cerebellar glomeruli (CG) in the granular layer after postnatal day 14. Using the high-resolution Airyscan mode of a confocal laser-scanning microscope, MPP2 was detected as a dot pattern and colocalized with CADM1 and Lin7, recognized as small ring/line patterns, as well as with calcium/calmodulin-dependent serine protein kinase (CASK), NMDA glutamate receptor 1 (GluN1), and M-cadherin, recognized as dot patterns, indicating the localization of MPP2 in the excitatory postsynaptic region and adherens junctions of granule cells. An immunoprecipitation analysis revealed that MPP2 formed a molecular complex with CADM1, CASK, M-cadherin, and Lin7. Furthermore, the Lin7 staining pattern showed small rings surrounding mossy fibers in wild-type CG, while it changed to the dot/spot pattern inside small rings detected with CADM1 staining in MPP2-deficient CG. These results indicate that MPP2 influences the distribution of Lin7 to synaptic cell membranes at postsynaptic regions in granule cells at CG, at which electric signals enter the cerebellum.
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Affiliation(s)
- Tomoki Yamada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Yurika Saitoh
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
- Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo, Japan
| | - Kiyokazu Kametani
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
| | - Akio Kamijo
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan
- Division of Basic and Clinical Medicine, Nagano College of Nursing, Komagane, Nagano, Japan
| | - Takeharu Sakamoto
- Department of Cancer Biology, Institute of Biomedical Science, Kansai Medical University, Hirakata, Osaka, Japan
| | - Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto, Nagano, 390-8621, Japan.
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Aikawa T, Miyazaki Y, Kihara S, Saitoh Y, Nishimura M, Stephan SL, Dewey CW. Vertebral stabilisation for thoracolumbar vertebral instability associated with cranial and caudal articular process anomalies in pugs: Seven cases (2010-2019). J Small Anim Pract 2022; 63:699-706. [PMID: 35577348 DOI: 10.1111/jsap.13505] [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: 10/24/2020] [Revised: 04/08/2022] [Accepted: 04/11/2022] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To describe the diagnostic findings, surgical technique and outcomes in seven pugs with thoracolumbar vertebral instability due to articular process anomalies. MATERIALS AND METHODS Records (2010 to 2019) of pugs with thoracolumbar vertebral instability associated with articular process anomalies that underwent decompressive laminectomy and vertebral stabilisation were reviewed. Data on preoperative and postoperative neurologic status, diagnostic findings, surgical techniques and outcomes were retrieved. RESULTS Seven dogs were presented with ambulatory or non-ambulatory paraparesis. Caudal articular process anomalies (three dogs) and concomitant cranial and caudal articular process anomalies (four dogs) were noted. Myelography (six dogs) or magnetic resonance imaging (one dog) showed none to severe spinal cord compression. Dynamic myelography in six dogs demonstrated nine distinct sites of spinal cord dimension reduction positioned in extension and/or flexion (mean reduction: 16.0%, range: 8.5 to 24.0%). These dynamic compressions were located at sites with articular process anomalies (seven sites) and sites with no articular process anomalies (two sites). Vertebral instability was confirmed by intraoperative spinal manipulation in all dogs. All dogs remained ambulatory with improved (five dogs) or static (two dogs) neurological deficits at the last follow-up (median: 16 months; range: 1.5 to 66 months). CLINICAL SIGNIFICANCE Dynamic myelography and/or intraoperative spinal manipulation demonstrated vertebral instabilities at sites with or without articular process anomalies on imaging. Decompressive laminectomy with vertebral stabilisation resulted in long-term neurological improvement in most dogs.
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Affiliation(s)
- T Aikawa
- Department of Surgery, Aikawa Veterinary Medical Center, Tokyo, Japan
| | - Y Miyazaki
- Department of Surgery, Aikawa Veterinary Medical Center, Tokyo, Japan
| | - S Kihara
- Department of Surgery, Aikawa Veterinary Medical Center, Tokyo, Japan
| | - Y Saitoh
- Department of Surgery, Aikawa Veterinary Medical Center, Tokyo, Japan
| | - M Nishimura
- Department of Surgery, Aikawa Veterinary Medical Center, Tokyo, Japan
| | - S L Stephan
- Department of Clinical Sciences, Cornell University College of Veterinary Medicine, Ithaca, New York, USA
| | - C W Dewey
- Elemental Pet Vets, Freeville, New York, USA
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5
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Saito M, Hirano M, Izumi T, Mori Y, Ito K, Saitoh Y, Terada N, Sato T, Sukegawa J. Cytoskeletal Protein 4.1G Is Essential for the Primary Ciliogenesis and Osteoblast Differentiation in Bone Formation. Int J Mol Sci 2022; 23:ijms23042094. [PMID: 35216233 PMCID: PMC8878336 DOI: 10.3390/ijms23042094] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 02/06/2022] [Accepted: 02/10/2022] [Indexed: 12/04/2022] Open
Abstract
The primary cilium is a hair-like immotile organelle with specific membrane receptors, including the receptor of Hedgehog signaling, smoothened. The cilium organized in preosteoblasts promotes differentiation of the cells into osteoblasts (osteoblast differentiation) by mediating Hedgehog signaling to achieve bone formation. Notably, 4.1G is a plasma membrane-associated cytoskeletal protein that plays essential roles in various tissues, including the peripheral nervous system, testis, and retina. However, its function in the bone remains unexplored. In this study, we identified 4.1G expression in the bone. We found that, in the 4.1G-knockout mice, calcium deposits and primary cilium formation were suppressed in the trabecular bone, which is preosteoblast-rich region of the newborn tibia, indicating that 4.1G is a prerequisite for osteoblast differentiation by organizing the primary cilia in preosteoblasts. Next, we found that the primary cilium was elongated in the differentiating mouse preosteoblast cell line MC3T3-E1, whereas the knockdown of 4.1G suppressed its elongation. Moreover, 4.1G-knockdown suppressed the induction of the cilia-mediated Hedgehog signaling and subsequent osteoblast differentiation. These results demonstrate a new regulatory mechanism of 4.1G in bone formation that promotes the primary ciliogenesis in the differentiating preosteoblasts and induction of cilia-mediated osteoblast differentiation, resulting in bone formation at the newborn stage.
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Affiliation(s)
- Masaki Saito
- Department of Molecular Pharmacology, Tohoku University School of Medicine, Sendai 980-8575, Japan; (M.H.); (T.I.); (T.S.)
- Correspondence: ; Tel.: +81-22-717-8207
| | - Marina Hirano
- Department of Molecular Pharmacology, Tohoku University School of Medicine, Sendai 980-8575, Japan; (M.H.); (T.I.); (T.S.)
- Department of Human Health and Nutrition, Shokei Gakuin University, Natori 981-1295, Japan;
| | - Tomohiro Izumi
- Department of Molecular Pharmacology, Tohoku University School of Medicine, Sendai 980-8575, Japan; (M.H.); (T.I.); (T.S.)
| | - Yu Mori
- Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (Y.M.); (K.I.)
| | - Kentaro Ito
- Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan; (Y.M.); (K.I.)
| | - Yurika Saitoh
- Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo 120-0045, Japan;
| | - Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto 390-0802, Japan;
| | - Takeya Sato
- Department of Molecular Pharmacology, Tohoku University School of Medicine, Sendai 980-8575, Japan; (M.H.); (T.I.); (T.S.)
| | - Jun Sukegawa
- Department of Human Health and Nutrition, Shokei Gakuin University, Natori 981-1295, Japan;
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6
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Fujiwara H, Umetsu RY, Kuroda F, Miyawaki J, Kashiuchi T, Nishimoto K, Nagai K, Sekiyama A, Irizawa A, Takeda Y, Saitoh Y, Oguchi T, Harada Y, Suga S. Detecting halfmetallic electronic structures of spintronic materials in a magnetic field. Sci Rep 2021; 11:18654. [PMID: 34545160 PMCID: PMC8452713 DOI: 10.1038/s41598-021-97992-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 09/01/2021] [Indexed: 11/09/2022] Open
Abstract
Band-gap engineering is one of the fundamental techniques in semiconductor technology and also applicable in next generation spintronics using the spin degree of freedom. To fully utilize the spintronic materials, it is essential to optimize the spin-dependent electronic structures in the operando conditions by applying magnetic and/or electric fields. Here we present an advanced spectroscopic technique to probe the spin-polarized electronic structures by using magnetic circular dichroism (MCD) in resonant inelastic soft X-ray scattering (RIXS) under an external magnetic field. Thanks to the spin-selective dipole-allowed transitions in RIXS-MCD, we have successfully demonstrated the direct evidence of the perfectly spin-polarized electronic structures for the prototypical halfmetallic Heusller alloy \documentclass[12pt]{minimal}
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\begin{document}$$\hbox {Co}_2\hbox {MnSi}$$\end{document}Co2MnSi. RIXS-MCD is a promising tool to probe the spin-dependent carriers and band-gap induced in the buried magnetic layers in an element specific way under the operando conditions.
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Affiliation(s)
- H Fujiwara
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
| | - R Y Umetsu
- Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai, Miyagi, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Sendai, Miyagi, 980-8577, Japan.,Center for Science and Innovation in Spintronics, 2-1-1 Katahira, Sendai, Miyagi, 980-8577, Japan
| | - F Kuroda
- SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - J Miyawaki
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.,Synchrotron Radiation Research Organization, The University of Tokyo, 1-1-1 Koto, Sayo-cho, Sayo, Hyogo, 679-5148, Japan.,Institute for Advanced Synchrotron Light Source, National Institutes for Quantum and Radiological Science and Technology, 6-6-11 Aoba, Sendai, Miyagi, 980-8579, Japan
| | - T Kashiuchi
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - K Nishimoto
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - K Nagai
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - A Sekiyama
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - A Irizawa
- SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
| | - Y Takeda
- Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo, 679-5148, Japan
| | - Y Saitoh
- Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Sayo, Hyogo, 679-5148, Japan
| | - T Oguchi
- SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.,Center for Spintronics Research Network, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - Y Harada
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.,Synchrotron Radiation Research Organization, The University of Tokyo, 1-1-1 Koto, Sayo-cho, Sayo, Hyogo, 679-5148, Japan
| | - S Suga
- SANKEN, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.,Forschungszentrum Jülich, PGI-6, 52425, Jülich, Germany
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7
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Amekura H, Toulemonde M, Narumi K, Li R, Chiba A, Hirano Y, Yamada K, Yamamoto S, Ishikawa N, Okubo N, Saitoh Y. Ion tracks in silicon formed by much lower energy deposition than the track formation threshold. Sci Rep 2021; 11:185. [PMID: 33420182 PMCID: PMC7794553 DOI: 10.1038/s41598-020-80360-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 12/15/2020] [Indexed: 11/09/2022] Open
Abstract
Damaged regions of cylindrical shapes called ion tracks, typically in nano-meters wide and tens micro-meters long, are formed along the ion trajectories in many insulators, when high energy ions in the electronic stopping regime are injected. In most cases, the ion tracks were assumed as consequences of dense electronic energy deposition from the high energy ions, except some cases where the synergy effect with the nuclear energy deposition plays an important role. In crystalline Si (c-Si), no tracks have been observed with any monomer ions up to GeV. Tracks are formed in c-Si under 40 MeV fullerene (C60) cluster ion irradiation, which provides much higher energy deposition than monomer ions. The track diameter decreases with decreasing the ion energy until they disappear at an extrapolated value of ~ 17 MeV. However, here we report the track formation of 10 nm in diameter under C60 ion irradiation of 6 MeV, i.e., much lower than the extrapolated threshold. The diameters of 10 nm were comparable to those under 40 MeV C60 irradiation. Furthermore, the tracks formed by 6 MeV C60 irradiation consisted of damaged crystalline, while those formed by 40 MeV C60 irradiation were amorphous. The track formation was observed down to 1 MeV and probably lower with decreasing the track diameters. The track lengths were much shorter than those expected from the drop of Se below the threshold. These track formations at such low energies cannot be explained by the conventional purely electronic energy deposition mechanism, indicating another origin, e.g., the synergy effect between the electronic and nuclear energy depositions, or dual transitions of transient melting and boiling.
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Affiliation(s)
- H Amekura
- National Institute for Materials Science (NIMS), Tsukuba, Japan.
| | | | - K Narumi
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
| | - R Li
- National Institute for Materials Science (NIMS), Tsukuba, Japan.,Shandong University, Jinan, China
| | - A Chiba
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
| | - Y Hirano
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
| | - K Yamada
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
| | - S Yamamoto
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
| | - N Ishikawa
- Japan Atomic Energy Agency, Tokai, Japan
| | - N Okubo
- Japan Atomic Energy Agency, Tokai, Japan
| | - Y Saitoh
- National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Japan
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8
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Saitoh Y, Miyazaki M, Tsuru A, Takahashi Y. REM sleep without atonia affects sleep architecture in multiple system atrophy. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.372] [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: 10/22/2022]
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9
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Shikin AM, Estyunin DA, Klimovskikh II, Filnov SO, Schwier EF, Kumar S, Miyamoto K, Okuda T, Kimura A, Kuroda K, Yaji K, Shin S, Takeda Y, Saitoh Y, Aliev ZS, Mamedov NT, Amiraslanov IR, Babanly MB, Otrokov MM, Eremeev SV, Chulkov EV. Nature of the Dirac gap modulation and surface magnetic interaction in axion antiferromagnetic topological insulator [Formula: see text]. Sci Rep 2020; 10:13226. [PMID: 32764583 PMCID: PMC7413556 DOI: 10.1038/s41598-020-70089-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/22/2020] [Indexed: 11/09/2022] Open
Abstract
Modification of the gap at the Dirac point (DP) in axion antiferromagnetic topological insulator [Formula: see text] and its electronic and spin structure have been studied by angle- and spin-resolved photoemission spectroscopy (ARPES) under laser excitation at various temperatures (9-35 K), light polarizations and photon energies. We have distinguished both large (60-70 meV) and reduced ([Formula: see text]) gaps at the DP in the ARPES dispersions, which remain open above the Neél temperature ([Formula: see text]). We propose that the gap above [Formula: see text] remains open due to a short-range magnetic field generated by chiral spin fluctuations. Spin-resolved ARPES, XMCD and circular dichroism ARPES measurements show a surface ferromagnetic ordering for the "large gap" sample and apparently significantly reduced effective magnetic moment for the "reduced gap" sample. These observations can be explained by a shift of the Dirac cone (DC) state localization towards the second Mn layer due to structural disturbance and surface relaxation effects, where DC state is influenced by compensated opposite magnetic moments. As we have shown by means of ab-initio calculations surface structural modification can result in a significant modulation of the DP gap.
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Affiliation(s)
- A. M. Shikin
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | - D. A. Estyunin
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | | | - S. O. Filnov
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
| | - E. F. Schwier
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - S. Kumar
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - K. Miyamoto
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - T. Okuda
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Hiroshima, Japan
| | - A. Kimura
- Department of Physical Sciences, Graduate School of Science, Hiroshima University, Hiroshima, Japan
| | - K. Kuroda
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - K. Yaji
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - S. Shin
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581 Japan
| | - Y. Takeda
- Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148 Japan
| | - Y. Saitoh
- Materials Sciences Research Center, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148 Japan
| | - Z. S. Aliev
- Azerbaijan State Oil and Industry University, AZ1010 Baku, Azerbaijan
- Institute of Physics, ANAS, AZ1143 Baku, Azerbaijan
| | | | - I. R. Amiraslanov
- Institute of Physics, ANAS, AZ1143 Baku, Azerbaijan
- Baku State University, AZ1148 Baku, Azerbaijan
| | - M. B. Babanly
- Baku State University, AZ1148 Baku, Azerbaijan
- Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143 Baku, Azerbaijan
| | - M. M. Otrokov
- Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastián, Basque Country Spain
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Basque Country Spain
| | - S. V. Eremeev
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
- Institute of Strength Physics and Materials Science, 634055 Tomsk, Russia
- Tomsk State University, 634050 Tomsk, Russia
| | - E. V. Chulkov
- Saint Petersburg State University, 198504 Saint Petersburg, Russia
- Tomsk State University, 634050 Tomsk, Russia
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Basque Country Spain
- Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain
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10
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Li R, Narumi K, Chiba A, Hirano Y, Tsuya D, Yamamoto S, Saitoh Y, Okubo N, Ishikawa N, Pang C, Chen F, Amekura H. Matrix-material dependence on the elongation of embedded gold nanoparticles induced by 4 MeV C 60 and 200 MeV Xe ion irradiation. Nanotechnology 2020; 31:265606. [PMID: 32155610 DOI: 10.1088/1361-6528/ab7e70] [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] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the elongation of embedded Au nanoparticles (NPs) in three different matrices, i.e. amorphous carbon (a-C), crystalline indium tin oxide (InxSn1-xOz; ITO) and crystalline calcium fluoride (CaF2), under irradiations of 4 MeV C60 + cluster ions and 200 MeV Xe14+ ions. Under 4 MeV C60 cluster irradiation, strong sputtering is induced in CaF2 layer so that the whole the layer was completely lost at a fluence of 5 × 1013 ions cm-2. Au NPs were partly observed in the SiO2, probably due to the recoil implantation. Amorphous carbon (a-C) layer exhibits low sputtering loss even under 4 MeV C60 irradiation. However, the elongation in a-C layer was low. While the ITO layer showed a certain decrease in thickness under 4 MeV C60 irradiation, large elongation of Au NPs was observed under both 4 MeV C60 and 200 MeV Xe irradiation. The ITO layer preserved the crystallinity even after large elongation was induced. This is the first report of the elongation of metal NPs in a crystalline matrix.
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Affiliation(s)
- R Li
- Hydrogen Materials Engineering Group, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0003, Japan. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
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11
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Nagashima S, Takeda K, Ohno N, Ishido S, Aoki M, Saitoh Y, Takada T, Tokuyama T, Sugiura A, Fukuda T, Matsushita N, Inatome R, Yanagi S. MITOL deletion in the brain impairs mitochondrial structure and ER tethering leading to oxidative stress. Life Sci Alliance 2019; 2:2/4/e201900308. [PMID: 31416892 PMCID: PMC6696985 DOI: 10.26508/lsa.201900308] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 08/01/2019] [Accepted: 08/01/2019] [Indexed: 12/27/2022] Open
Abstract
MITOL deletion in mouse brain impairs the morphology and ER tethering of mitochondria, resulting in enhanced oxidative stress. This study suggests a relationship between morphological abnormalities of mitochondria and developmental disorder. Mitochondrial abnormalities are associated with developmental disorders, although a causal relationship remains largely unknown. Here, we report that increased oxidative stress in neurons by deletion of mitochondrial ubiquitin ligase MITOL causes a potential neuroinflammation including aberrant astrogliosis and microglial activation, indicating that mitochondrial abnormalities might confer a risk for inflammatory diseases in brain such as psychiatric disorders. A role of MITOL in both mitochondrial dynamics and ER-mitochondria tethering prompted us to characterize three-dimensional structures of mitochondria in vivo. In MITOL-deficient neurons, we observed a significant reduction in the ER-mitochondria contact sites, which might lead to perturbation of phospholipids transfer, consequently reduce cardiolipin biogenesis. We also found that branched large mitochondria disappeared by deletion of MITOL. These morphological abnormalities of mitochondria resulted in enhanced oxidative stress in brain, which led to astrogliosis and microglial activation partly causing abnormal behavior. In conclusion, the reduced ER-mitochondria tethering and excessive mitochondrial fission may trigger neuroinflammation through oxidative stress.
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Affiliation(s)
- Shun Nagashima
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Keisuke Takeda
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Nobuhiko Ohno
- Department of Anatomy, Division of Histology and Cell Biology, School of Medicine, Jichi Medical University, Shimotsuke, Japan
| | - Satoshi Ishido
- Department of Microbiology, Hyogo College of Medicine, Nishinomiya, Japan
| | - Motohide Aoki
- Laboratory of Bioanalytical and Environmental Chemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Yurika Saitoh
- Department of Tokyo Physical Therapy, Faculty of Medical Science, Teikyo University of Science, Adachi-ku, Tokyo, Japan
| | - Takumi Takada
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Takeshi Tokuyama
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Ayumu Sugiura
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Toshifumi Fukuda
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Nobuko Matsushita
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Ryoko Inatome
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Shigeru Yanagi
- Laboratory of Molecular Biochemistry, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
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12
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Kamijo A, Saitoh Y, Sakamoto T, Kubota H, Yamauchi J, Terada N. Scaffold protein Lin7 family in membrane skeletal protein complex in mouse seminiferous tubules. Histochem Cell Biol 2019; 152:333-343. [PMID: 31410570 DOI: 10.1007/s00418-019-01807-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/02/2019] [Indexed: 01/22/2023]
Abstract
The membrane skeletal complex, protein 4.1G-membrane palmitoylated protein 6 (MPP6), is localized in spermatogonia and early spermatocytes of mouse seminiferous tubules. In this study, we investigated the Lin7 family of scaffolding proteins, which interact with MPP6. By immunohistochemistry, Lin7a and Lin7c were localized in germ cells, and Lin7c had especially strong staining in spermatogonia and early spermatocytes, characterized by staging of seminiferous tubules. By immunoelectron microscopy, Lin7 localization appeared under cell membranes in germ cells. The Lin7 staining pattern in seminiferous tubules was partially similar to that of 4.1G, cell adhesion molecule 1 (CADM1), and melanoma cell adhesion molecule (MCAM). Lin7-positive cells included type A spermatogonia, as revealed by double staining for Lin28a. Lin7 staining became weaker in MPP6-deficient mice by immunohistochemistry and western blotting, indicating that MPP6 transports and maintains Lin7 in germ cells. The histology of seminiferous tubules was unchanged in MPP6-deficient mice compared to that of wild-type mice. In cultured spermatogonial stem cells maintained with glial cell line-derived neurotropic factor (GDNF), Lin7 was clearly expressed and immunolocalized along cell membranes, especially at cell-cell junctions. Thus, Lin7 protein is expressed in germ cells, and Lin7, particularly Lin7c, is a useful marker for early spermatogenesis.
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Affiliation(s)
- Akio Kamijo
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto City, Nagano, 390-8621, Japan
| | - Yurika Saitoh
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto City, Nagano, 390-8621, Japan.,Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo, Japan
| | - Takeharu Sakamoto
- Division of Cellular and Molecular Biology, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan
| | - Hiroshi Kubota
- Laboratory of Cell and Molecular Biology, Department of Animal Science, School of Veterinary Medicine, Kitasato University, Towada, Aomori, Japan
| | - Junji Yamauchi
- Laboratory of Molecular Neuroscience and Neurology, School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji City, Tokyo, Japan
| | - Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, 3-1-1 Asahi, Matsumoto City, Nagano, 390-8621, Japan.
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13
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Kojima T, Aihara H, Kodashima Y, Makishima H, Nakiri S, Takada S, Shimada H, Ukai M, Ozga C, Holzapfel X, Schmidt P, Küstner-Wetekam C, Otto H, Bloβ D, Knie A, Ehresmann A, Yokoya A, Fujii K, Fukuda Y, Saitoh Y. NOVEL ANALYTICAL STUDY FOR REACTION INTERMEDIATES IN THE PRIMARY RADIATION INTERACTION OF DNA USING A SYNCHROTRON RADIATION-INDUCED LUMINESCENCE SPECTROSCOPY. Radiat Prot Dosimetry 2019; 183:32-35. [PMID: 30753692 DOI: 10.1093/rpd/ncy239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Indexed: 06/09/2023]
Abstract
To identify the precise molecular processes to induce DNA lesions, we attempt a novel spectroscopy of X-ray induced luminescence (XIL) using soft X-ray synchrotron radiation, which is a non-destructive analysis of the reaction intermediates in the elementary reaction pathway of damage induction and self-organized restoration. Using a liquid micro-jet technique to introduce aqueous samples in a vacuum chamber, we measure UV-visible luminescence from nucleotide solution as a function of the soft X-ray energy from the nitrogen to oxygen K-edge region. The XIL intensities for the nucleotide solutions are significantly enhanced in the soft X-ray region (410-530 eV) which is ascribed to the K-shell excitation/ionization of nitrogen atoms in the nucleobases. Furthermore, the XIL spectra do not show any signature of X-ray absorption near-edge structure (XANES) of the nucleobases. This is because the luminescence intensities collected from the integral area of the micro-jet only reflect the quantum yield of luminescence of the absorbed X-ray into UV-visible light irrespective of the absorption cross sections, i.e. of XANES. Thus the present result is the first evidence of luminescence as a result of X-ray absorption of aqueous nucleotides.
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Affiliation(s)
- T Kojima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Aihara
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - Y Kodashima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Makishima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - S Nakiri
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - S Takada
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Shimada
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - M Ukai
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - C Ozga
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - X Holzapfel
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - Ph Schmidt
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - C Küstner-Wetekam
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - H Otto
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - D Bloβ
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Knie
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Ehresmann
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Yokoya
- Center of Quantum beam Science, National Institute for Quantum and Radiological Science (QST), Naka-gun, Ibaraki, Japan
| | - K Fujii
- Center of Quantum beam Science, National Institute for Quantum and Radiological Science (QST), Naka-gun, Ibaraki, Japan
| | - Y Fukuda
- Synchrotron Radiation Research Center, Japan Atomic Energy Agency (JAEA), Sayo-gun, Hyougo, Japan
| | - Y Saitoh
- Synchrotron Radiation Research Center, Japan Atomic Energy Agency (JAEA), Sayo-gun, Hyougo, Japan
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14
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Hosomi K, Mori N, Mano T, Kishima H, Saitoh Y. Exploratory study of optimal conditions of repetitive transcranial magnetic stimulation of the primary motor cortex for chronic pain. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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15
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Abstract
Schmidt-Lanterman incisure (SLI) is a circular-truncated cone shape in the myelin internode that is a specific feature of myelinated nerve fibers formed in Schwann cells in the peripheral nervous system (PNS). The SLI circular-truncated cones elongate like spring at the narrow sites of beaded appearance nerve fibers under the stretched condition. In this chapter, we demonstrate various molecular complexes in SLI, and especially focus on membrane skeleton, protein 4.1G-membrane protein palmitoylated 6 (MPP6)-cell adhesion molecule 4 (CADM4). 4.1G was essential for the molecular targeting of MPP6 and CADM4 in SLI. Motor activity and myelin ultrastructures were abnormal in 4.1G-deficient mice, indicating the 4.1G function as a signal for proper formation of myelin in PNS. Thus, SLI probably has potential roles in the regulation of adhesion and signal transduction as well as in structural stability in Schwann cell myelin formation.
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Affiliation(s)
- Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan.
| | - Yurika Saitoh
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan
- Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo, Japan
| | - Akio Kamijo
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan
| | - Junji Yamauchi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Science, Hachioji, Tokyo, Japan
| | - Nobuhiko Ohno
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Aichi, Japan
- Department of Anatomy, Division of Histology and Cell Biology, Jichi Medical University, School of Medicine, Shimotsuke, Japan
| | - Takeharu Sakamoto
- Division of Cellular and Molecular Biology, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan
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16
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Saitoh Y, Kaneda K, Tokunaga Y, Murakawa M. Retraction notice to “Infusion of amino acid enriched solution hastens recovery from neuromuscular block caused by vecuronium” [Br J Anaesth 2001; 86: 814–821]. Br J Anaesth 2019; 122:155. [DOI: 10.1016/j.bja.2018.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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17
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Terada H, Saitoh Y, Kametani K, Sakaguchi M, Sakamoto T, Kamijo A, Terada N. Electron microscopic observation of photoreceptor cells in directly inserted anesthetized Drosophila into a high-pressure freezing unit. Microsc Res Tech 2018; 82:244-249. [PMID: 30582253 DOI: 10.1002/jemt.23166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 10/05/2018] [Accepted: 10/10/2018] [Indexed: 11/05/2022]
Abstract
The high-pressure freezing (HPF) technique is known to cryofix water-containing materials with little ice-crystal formation in deep depths compared with other freezing techniques. In this study, HPF for anesthetized living Drosophila was performed by placing them directly on the carrier of the HPF unit and exposing them to light. Frozen Drosophila were freeze substituted, and their compound eyes were examined by transmission electron microscopy. The ultrastructures of ommatidia composed of photoreceptor cells were well preserved. The location of the cytoplasmic organelles inside the photoreceptor cells was observed. In some photoreceptor cells in ommatidia of the light-exposed Drosphila, the cytoplasmic small granules were localized nearer the base of rhabdomeres, compared with those of the nonlight-exposed Drosophila. Thus, HPF with the direct insertion of living Drosophila under light exposure into the HPF machine enabled us to examine changes to functional structures of photoreceptor cells that occur within seconds.
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Affiliation(s)
- Hitomi Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan.,Division of Sciences, Shinshu University School of Education, Nagano City, Nagano, Japan
| | - Yurika Saitoh
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan.,Center for Medical Education, Teikyo University of Science, Adachi-ku, Tokyo, Japan
| | - Kiyokazu Kametani
- Department of Instrumental Analysis, Research Center for Human and Environmental Science, Shinshu University, Matsumoto City, Nagano, Japan
| | - Masahiko Sakaguchi
- Division of Sciences, Shinshu University School of Education, Nagano City, Nagano, Japan
| | - Takeharu Sakamoto
- Division of Molecular Pathology, The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, Japan
| | - Akio Kamijo
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan
| | - Nobuo Terada
- Health Science Division, Department of Medical Sciences, Shinshu University Graduate School of Medicine, Science and Technology, Matsumoto City, Nagano, Japan
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18
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Saitoh Y, Toyooka H, Amaha K. Retraction notice to "Recoveries of post-tetanic twitch and train-of-four responses after administration of vecuronium with different inhalation anaesthetics and neuroleptanaesthesia" [Br J Anaesth 1993; 70: 402-404]. Br J Anaesth 2018; 122:150. [PMID: 30579394 DOI: 10.1016/j.bja.2018.11.001] [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: 12/01/2022] Open
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief of British Journal of Anaesthesia. The study is retracted for the following reasons: Statistical analysis suggests that the data may be fabricated. Y Saitoh provided a statement in a personal communication to a member of the editorial board of British Journal of Anaesthesia that the study was not approved by the Institutional Review Board and that no evidence exists to support the study findings. Additionally, the Japanese Society of Anesthesiologists has recommended retraction of this article: http://www.anesth.or.jp/english/pdf/news20170925.pdf.
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Affiliation(s)
- Y Saitoh
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - H Toyooka
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - K Amaha
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
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19
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Saitoh Y, Toyooka H, Amaha K. Retraction notice to "Relationship between post-tetanic twitch and single twitch response after administration of vecuronium" [Br J Anaesth 1993; 71: 443-444]. Br J Anaesth 2018; 122:151. [PMID: 30579395 DOI: 10.1016/j.bja.2018.11.002] [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: 11/25/2022] Open
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief of British Journal of Anaesthesia. The study is retracted for the following reasons: Y Saitoh provided a statement in a personal communication to a member of the editorial board of British Journal of Anaesthesia that the study was not approved by the Institutional Review Board and that no evidence exists to support the study findings.
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Affiliation(s)
- Y Saitoh
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - H Toyooka
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - K Amaha
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
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20
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Saitoh Y, Kaneda K, Toyooka H, Amaha K. Retraction notice to "Post-tetanic count and single twitch height at the onset of reflex movement after administration of vecuronium under different types of anaesthesia" [Br J Anaesth 1994; 72: 688-690]. Br J Anaesth 2018; 122:152. [PMID: 30579396 DOI: 10.1016/j.bja.2018.11.003] [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: 10/27/2022] Open
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief of British Journal of Anaesthesia. The study is retracted for the following reasons: Y Saitoh provided a statement in a personal communication to a member of the editorial board of British Journal of Anaesthesia that the study was not approved by the Institutional Review Board and that no evidence exists to support the study findings.
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Affiliation(s)
- Y Saitoh
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - K Kaneda
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - H Toyooka
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
| | - K Amaha
- Department of Anaesthesiology and Critical Care Medicine, Faculty of Medicine, Tokyo Medical and Dental University 5-45, Yushima, 1-Chome, Bunkyo-ku, Tokyo 113, Japan
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21
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Kuroda Y, Fujino Y, Morita A, Tanioka Y, Suzuki V, Kawamura T, Ku Y, Saitoh Y. Successful 96-hour preservation of the canine pancreas. Transpl Int 2018. [DOI: 10.1111/tri.1992.5.s1.388] [Citation(s) in RCA: 2] [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: 11/29/2022]
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22
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Kuroda Y, Fujino Y, Morita A, Tanioka Y, Suzuki Y, Kawamura T, Ku Y, Saitoh Y. The mechanism of action of the two-layer (Euro-Collins' solution/perfluorochemical) cold storage method in canine pancreas preservation. Transpl Int 2018. [DOI: 10.1111/tri.1992.5.s1.391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Abstract
A review of the authors' experience on the use of Fluosol DA. This includes studies on animals and also clinical trials on patients.
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Affiliation(s)
- H. Ohyanagi
- First Department of Surgery, Kobe University, School of Medicine, Kobe, Japan
| | - Y. Saitoh
- First Department of Surgery, Kobe University, School of Medicine, Kobe, Japan
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24
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Saitoh S, Ohno N, Saitoh Y, Terada N, Shimo S, Aida K, Fujii H, Kobayashi T, Ohno S. Improved Serial Sectioning Techniques for Correlative Light-Electron Microscopy Mapping of Human Langerhans Islets. Acta Histochem Cytochem 2018; 51:9-20. [PMID: 29622846 PMCID: PMC5880804 DOI: 10.1267/ahc.17020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 11/29/2017] [Indexed: 01/19/2023] Open
Abstract
Combined analysis of immunostaining for various biological molecules coupled with investigations of ultrastructural features of individual cells is a powerful approach for studies of cellular functions in normal and pathological conditions. However, weak antigenicity of tissues fixed by conventional methods poses a problem for immunoassays. This study introduces a method of correlative light and electron microscopy imaging of the same endocrine cells of compact and diffuse islets from human pancreatic tissue specimens. The method utilizes serial sections obtained from Epon-embedded specimens fixed with glutaraldehyde and osmium tetroxide. Double-immunofluorescence staining of thick Epon sections for endocrine hormones (insulin and glucagon) and regenerating islet-derived gene 1 α (REG1α) was performed following the removal of Epoxy resin with sodium ethoxide, antigen retrieval by autoclaving, and de-osmification treatment with hydrogen peroxide. The immunofluorescence images of endocrine cells were superimposed with the electron microscopy images of the same cells obtained from serial ultrathin sections. Immunofluorescence images showed well-preserved secretory granules in endocrine cells, whereas electron microscopy observations demonstrated corresponding secretory granules and intracellular organelles in the same cells. In conclusion, the correlative imaging approach developed by us may be useful for examining ultrastructural features in combination with immunolocalisation of endocrine hormones in the same human pancreatic islets.
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Affiliation(s)
- Sei Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
- Present address: Section of Electron Microscopy, Supportive Center for Brain Research, National Institute for Physiological Sciences
| | - Nobuhiko Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Yurika Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Nobuo Terada
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
- Department of Occupational Therapy, School of Health Sciences, Shinshu University School of Medicine
| | - Satoshi Shimo
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Kaoru Aida
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Hideki Fujii
- First Department of Surgery, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Tetsuro Kobayashi
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Shinichi Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
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Abstract
Abstract:Multivariate analysis would be effective in finding the functional change from several variables obtained from multivariate biological signals. We applied this idea to the discrimination of sustained fatiguing contraction from negative ramp contraction. The time-series of eigenvalues were obtained from multidimensional biological variables by the Karhunen-Loève expansion. The results showed that, the first and second eigenvalues came close to each other during fatiguing contraction, whereas only the first eigenvalue was dominant during negative ramp contraction. Moreover, the factor loadings showed considerable difference between fatiguing contraction and negative ramp contraction. As a result, the muscular-fatigue-related functional change could be represented clearly by the time-series of proportions and factor loadings.
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Saitoh Y, Kiryu T, Okamoto K, Sakai K, Hori J. Band-Suppressed Restoration of X-Ray Images Blurred by Body Movement. Methods Inf Med 2018. [DOI: 10.1055/s-0038-1634282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Abstract:The restoration of X-ray images that have been blurred due to body movement are discussed. The observation system for these images is described using a mathematical model, and several restoration filters composed of a series of such models are proposed. These filters restore band-suppressed approximations of the original images. In addition, redundancy is introduced into these restoration filters in order to suppress additive noise. These filters are expanded to be applicable not only to parallel translations, but also to rotations by coordinate transformation. The proposed methods are applied to blurred X-ray images of a bone model of the elbow joint. The parameters of the restoration filter are estimated using a marker attached to the subject as a reference signal.
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Lai YC, Ushio N, Rahman MM, Katanoda Y, Ogihara K, Naya Y, Moriyama A, Iwanaga T, Saitoh Y, Sogawa T, Sunaga T, Momoi Y, Izumi H, Miyoshi N, Endo Y, Fujiki M, Kawaguchi H, Miura N. Aberrant expression of microRNAs and the miR-1/MET pathway in canine hepatocellular carcinoma. Vet Comp Oncol 2018; 16:288-296. [DOI: 10.1111/vco.12379] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 11/16/2017] [Accepted: 11/30/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Y.-C. Lai
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
- The United Graduate School of Veterinary Science; Yamaguchi University; Yamaguchi Japan
| | - N. Ushio
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
- The United Graduate School of Veterinary Science; Yamaguchi University; Yamaguchi Japan
| | - M. M. Rahman
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
- The United Graduate School of Veterinary Science; Yamaguchi University; Yamaguchi Japan
| | - Y. Katanoda
- Laboratory of Veterinary Diagnostic Imaging, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - K. Ogihara
- Laboratory of Pathology, School of Life and Environmental Science; Azabu University; Sagamihara Japan
| | - Y. Naya
- Laboratory of Pathology, School of Life and Environmental Science; Azabu University; Sagamihara Japan
| | - A. Moriyama
- Drug Safety Research Laboratories; Shin Nippon Biomedical Laboratories, Ltd.; Kagoshima Japan
| | - T. Iwanaga
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - Y. Saitoh
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - T. Sogawa
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - T. Sunaga
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - Y. Momoi
- Laboratory of Veterinary Diagnostic Imaging, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - H. Izumi
- Drug Safety Research Laboratories; Shin Nippon Biomedical Laboratories, Ltd.; Kagoshima Japan
| | - N. Miyoshi
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - Y. Endo
- Laboratory of Small Animal Internal Medicine, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - M. Fujiki
- Laboratory of Veterinary Surgery, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
| | - H. Kawaguchi
- Department of Hygiene and Health Promotion Medicine; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan
| | - N. Miura
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine; Kagoshima University; Kagoshima Japan
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28
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Saitoh Y, Murata M, Takahashi Y. Clinical relationship among anxiety, rapid eye movement sleep behavior disorder, and abnormal 123I-MIBG-scintigraphy in patients with Parkinson’s disease. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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29
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Suzuki M, Neumann A, Saitoh Y, Fujikake N, Wada K, Sango K, Nagai Y. Improvement of misfolding protein-induced neurodegeneration by dietary restriction in drosophila. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Hunuk B, Mugnai G, De Asmundis C, Velagic V, Saitoh Y, Cioconte G, Irfan G, Stroker E, Hacioglu E, De Regibus V, Moran D, Coutino-Moreno H, Cagac O, Chierchia G, Brugada P. P2324A novel high risk ECG feature in Brugada Syndrome Probands: Localized QRS prolongation on right precordial leads. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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31
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Katoh M, Wu B, Nguyen HB, Thai TQ, Yamasaki R, Lu H, Rietsch AM, Zorlu MM, Shinozaki Y, Saitoh Y, Saitoh S, Sakoh T, Ikenaka K, Koizumi S, Ransohoff RM, Ohno N. Polymorphic regulation of mitochondrial fission and fusion modifies phenotypes of microglia in neuroinflammation. Sci Rep 2017; 7:4942. [PMID: 28694451 PMCID: PMC5503944 DOI: 10.1038/s41598-017-05232-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 05/25/2017] [Indexed: 12/18/2022] Open
Abstract
Microglia are the resident macrophages of the central nervous system and play complex roles in the milieu of diseases including the primary diseases of myelin. Although mitochondria are critical for cellular functions and survival in the nervous system, alterations in and the roles of mitochondrial dynamics and associated signaling in microglia are still poorly understood. In the present study, by combining immunohistochemistry and 3D ultrastructural analyses, we show that mitochondrial fission/fusion in reactive microglia is differentially regulated from that in monocyte-derived macrophages and the ramified microglia of normal white matter in myelin disease models. Mouse cerebral microglia in vitro demonstrated that stimulation of TLR4 with lipopolysaccharide, widely used to examine microglial reactions, caused the activation of the mitochondrial fission protein, dynamin-related protein 1 (Drp1) and enhanced production of reactive oxygen species (ROS). The increase in the ROS level activated 5' adenosine monophosphate-activated protein kinase (AMPK), and facilitated elongation of mitochondria along the microtubule tracks. These results suggest that the polymorphic regulation of mitochondrial fission and fusion in reactive microglia is mediated by distinct signaling under inflammatory conditions, and modulates microglial phenotypes through the production of ROS.
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Affiliation(s)
- Mitsuhiko Katoh
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Bao Wu
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan.,Department of Histology and Embryology, Medical College of Chifeng University, Inner Mongolia, 024000, China
| | - Huy Bang Nguyen
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Truc Quynh Thai
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Ryo Yamasaki
- Neuroinflammation Research Center, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Haiyan Lu
- Neuroinflammation Research Center, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Anna M Rietsch
- Neuroinflammation Research Center, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Musab M Zorlu
- Neuroinflammation Research Center, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Youichi Shinozaki
- Neuropharmacology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Yurika Saitoh
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Sei Saitoh
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Takashi Sakoh
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Kazuhiro Ikenaka
- Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Aichi, 444-8787, Japan
| | - Schuichi Koizumi
- Neuropharmacology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan
| | - Richard M Ransohoff
- Neuroinflammation Research Center, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - Nobuhiko Ohno
- Departments of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, 409-3898, Japan. .,Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, Okazaki, Aichi, 444-8787, Japan.
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32
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Hagihara Y, Saitoh Y, Iwata H, Taki T, Hirano S, Arita N, Hayakawa T. Transplantation of Xenogeneic Cells Secreting β-Endorphin for Pain Treatment: Analysis of the Ability of Components of Complement to Penetrate through Polymer Capsules. Cell Transplant 2017; 6:527-30. [PMID: 9331506 DOI: 10.1177/096368979700600515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The permeation of components of complement and secreted peptides through polymer capsules (PM30, K6305, and K5708) were examined. To analyze permeability by complement, the degree of hemolysis of sensitized sheep erythrocytes (EA) (1 × 109/ml) enclosed in each type of capsule was examined after 24-h incubation in culture medium containing 10% human serum. PM30 and K6305 prevented the permeation of complement well, while K5708 did not. EA suspended in alginate prevented hemolysis even in K5708. Peptide permeation through the capsules was assessed by measuring the concentration of ACTH secreted by proopiomelanocortin (POMC)-gene-transfected-Neuro2A in the culture medium on days 4, 7, 14, 21, and 28 after encapsulation. The ACTH levels in the culture medium remained high until day 28. Alginate appeared to prevent the secretion, because ACTH levels decreased in alginate-suspended cells after day 14. The PM30-K6305 double capsules containing cell lines, Neuro2A, BHK21 (hamster fibroblasts), L929 (mouse fibroblasts), and HF-SKFII (human fibroblasts) were transplanted into the cerebrospinal fluid (CSF) space of the monkeys in the lumber region. The morphological examination showed the partial survival of Neuro2A, and BHK21 and HF-SKFII, which were cells concordant with the monkeys. On the other hand, L929 cells, which were discordant with the monkeys, could not survive at all. Because these results suggest that the complement components penetrate the polymer capsules, concordant cells are preferable for xenografting with polymer capsules into the CSF space.
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Affiliation(s)
- Y Hagihara
- Department of Neurosurgery, Osaka University Medical School, Japan
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33
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Saitoh Y, Satomi K, Terasawa M, Kobayashi Y, Kaneyama J, Yazaki Y, De Asmundis C, Brugada P, Yamashina A, Chierchia GB. P347Correlation between compound motor action potential and femoral venous pressure waveform as novel phrenic nerve monitoring. Europace 2017. [DOI: 10.1093/ehjci/eux141.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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35
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Hirata K, Yamada K, Chiba A, Narumi K, Saitoh Y. Characterization of secondary ion emission processes of sub-MeV C 60 ion impacts via analysis of statistical distributions of the emitted ion number. J Chem Phys 2016; 145:234311. [PMID: 28010077 DOI: 10.1063/1.4972061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report probability distributions of the number of secondary ions (SIs) emitted by sub-MeV C60 ion impacts on an organic polymer target and the characterization of their emission processes through the analysis of the distributions. The probability distributions were obtained by analyzing experimental SI counting data obtained by a time-of-flight SI mass spectrometer combined with pulsed primary ion beams, using an analytical model developed to derive the distributions from the experimental data. A series of probability distribution functions was investigated for ion impacts of C60 with sub-MeV energies (0.12-0.54 MeV), which can provide sufficient SIs per impact to determine the functions. Their complicated and undefined SI emission processes were characterized based on the determined functions.
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Affiliation(s)
- K Hirata
- National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - K Yamada
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
| | - A Chiba
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
| | - K Narumi
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
| | - Y Saitoh
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gumma 370-1292, Japan
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36
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Nihei N, Kanazawa T, Blas BL, Saitoh Y, Itagaki H, Pangilinan R, Matsuda H, Yasuraoka K. Soil factors influencing the distribution of Oncomelania quadrasi, the intermediate host of Schistosoma japonicum, on Bohol Island, Philippines. Annals of Tropical Medicine & Parasitology 2016. [DOI: 10.1080/00034983.1998.11813330] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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37
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Ohno S, Saitoh Y, Ohno N, Terada N. Renaissance of morphological studies: the examination of functional structures in living animal organs using the in vivo cryotechnique. Anat Sci Int 2016; 92:55-78. [DOI: 10.1007/s12565-016-0355-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 06/27/2016] [Indexed: 11/28/2022]
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38
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Nguyen HB, Thai TQ, Saitoh S, Wu B, Saitoh Y, Shimo S, Fujitani H, Otobe H, Ohno N. Conductive resins improve charging and resolution of acquired images in electron microscopic volume imaging. Sci Rep 2016; 6:23721. [PMID: 27020327 PMCID: PMC4810419 DOI: 10.1038/srep23721] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 03/14/2016] [Indexed: 11/09/2022] Open
Abstract
Recent advances in serial block-face imaging using scanning electron microscopy (SEM) have enabled the rapid and efficient acquisition of 3-dimensional (3D) ultrastructural information from a large volume of biological specimens including brain tissues. However, volume imaging under SEM is often hampered by sample charging, and typically requires specific sample preparation to reduce charging and increase image contrast. In the present study, we introduced carbon-based conductive resins for 3D analyses of subcellular ultrastructures, using serial block-face SEM (SBF-SEM) to image samples. Conductive resins were produced by adding the carbon black filler, Ketjen black, to resins commonly used for electron microscopic observations of biological specimens. Carbon black mostly localized around tissues and did not penetrate cells, whereas the conductive resins significantly reduced the charging of samples during SBF-SEM imaging. When serial images were acquired, embedding into the conductive resins improved the resolution of images by facilitating the successful cutting of samples in SBF-SEM. These results suggest that improving the conductivities of resins with a carbon black filler is a simple and useful option for reducing charging and enhancing the resolution of images obtained for volume imaging with SEM.
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Affiliation(s)
- Huy Bang Nguyen
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan
| | - Truc Quynh Thai
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan
| | - Sei Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan
| | - Bao Wu
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan
| | - Yurika Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan
| | - Satoshi Shimo
- Department of Occupational Therapy, Health Science University, Fujikawaguchiko, Yamanashi 401-0380, Japan
| | | | - Hirohide Otobe
- Asahi Kasei Chemicals Corporation, Kawasaki-city, Kanagawa 210-0863 Japan
| | - Nobuhiko Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo-city, Yamanashi 409-3898, Japan.,Center for Multidisciplinary Brain Research, National Institute for Physiological Sciences, Okazaki, Aichi 444-8787, Japan
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Saitoh Y, Hosomi K, Nakamura H, Shimizu T. The Japanese rTMS experience – Present and future. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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40
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Shimizu T, Maruo T, Hosomi K, Goto Y, Yokoe M, Kageyama Y, Yanagisawa T, Oshino S, Kishima H, Yoshimine T, Saitoh Y. Efficacy of repetitive transcranial stimulation with H-coil for treatment of intractable neuropathic pain in lower extremities. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.089] [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: 11/25/2022]
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41
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Thai TQ, Nguyen HB, Saitoh S, Wu B, Saitoh Y, Shimo S, Elewa YHA, Ichii O, Kon Y, Takaki T, Joh K, Ohno N. Rapid specimen preparation to improve the throughput of electron microscopic volume imaging for three-dimensional analyses of subcellular ultrastructures with serial block-face scanning electron microscopy. Med Mol Morphol 2016; 49:154-62. [DOI: 10.1007/s00795-016-0134-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 01/31/2016] [Indexed: 11/24/2022]
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42
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Ohno N, Katoh M, Saitoh Y, Saitoh S. Recent advancement in the challenges to connectomics. Microscopy (Oxf) 2015; 65:97-107. [PMID: 26671942 DOI: 10.1093/jmicro/dfv371] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 09/10/2015] [Accepted: 11/12/2015] [Indexed: 01/23/2023] Open
Abstract
Advancement of microscopic technologies established significant progress in our understanding of the brain. In the recent effort to elucidate the complete wiring map of the brain circuitry termed 'connectome', the different modalities of imaging technology, including those of light and electron microscopy, have started providing essential contribution in multiple organisms. The contribution would be impossible without the recent innovation in both acquisition and analyses of the big connectomic data. The current data demonstrated complicated networks with unidirectional and reciprocal connections of the cerebral circuits at the macroscopic and light microscopic ('mesoscopic') levels, and the unimaginable complexity of synaptic connections between axons and dendrites at the electron microscopic ('microscopic') level. At the same time, the data highlighted the necessity to make substantial advancement in methodology of the connectomic studies, including efficient handling and automated analyses of the acquired dataset. Further understanding about structural and functional connectome seems to be facilitated by combinations of the different imaging modalities. Such multidisciplinary approaches will give us the clues to address whether the complete connectome can elucidate fundamental mechanisms processing the basic and higher functions of human brains.
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Affiliation(s)
- Nobuhiko Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo-city, Yamanashi 409-3898, Japan
| | - Mitsuhiko Katoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo-city, Yamanashi 409-3898, Japan
| | - Yurika Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo-city, Yamanashi 409-3898, Japan
| | - Sei Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo-city, Yamanashi 409-3898, Japan
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Terada N, Saitoh Y, Kamijo A, Ohno S, Ohno N. Involvement of membrane skeletal molecules in the Schmidt-Lanterman incisure in Schwann cells. Med Mol Morphol 2015; 49:5-10. [PMID: 26541343 DOI: 10.1007/s00795-015-0125-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 10/27/2015] [Indexed: 12/21/2022]
Abstract
Membrane skeletal networks form a two-dimensional lattice structure beneath erythrocyte membranes. 4.1R-MPP (membrane palmitoylated protein) 1-glycophorin C is one of the basic molecular complexes of the membrane skeleton. An analogous molecular complex, 4.1G-MPP6-cell adhesion molecule 4 (CADM4), is incorporated into the Schmidt-Lanterman incisure (SLI), a truncated cone shape in the myelin internode that is a specific feature of myelinated nerve fibers formed in Schwann cells in the peripheral nervous system. In this review, the dynamic structure of peripheral nerve fibers under stretching conditions is demonstrated using in vivo cryotechnique. The structures of nerve fibers had a beaded appearance, and the heights of SLI circular-truncated cones increased at the narrow sites of nerve fibers under the stretched condition. The height of SLI-truncated cones was lower in 4.1G-deficient nerve fibers than in wild-type nerve fibers. 4.1G was essential for the molecular targeting of MPP6 and CADM4 in SLI. The signal transduction protein, Src, was also involved in the 4.1G-MPP6-CADM4 molecular complex. The phosphorylation of Src was altered by the deletion of 4.1G. Thus, we herein demonstrate a membrane skeletal molecular complex in SLI that has potential roles in the regulation of adhesion and signal transduction as well as in structural stability in Schwann cells.
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Affiliation(s)
- Nobuo Terada
- Division of Health Sciences, Shinshu University Graduate School of Medicine, 3-1-1 Asahi, Matsumoto City, Nagano, 390-8621, Japan.
| | - Yurika Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo City, Yamanashi, Japan
| | - Akio Kamijo
- Division of Health Sciences, Shinshu University Graduate School of Medicine, 3-1-1 Asahi, Matsumoto City, Nagano, 390-8621, Japan
| | - Shinichi Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo City, Yamanashi, Japan
| | - Nobuhiko Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 1110 Shimokato, Chuo City, Yamanashi, Japan
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Nguyen HB, Huang Z, Thai TQ, Wu B, Saitoh S, Saitoh Y, Ikenaka K, Ohno N. C1-P-02Analyses of mitochondrial changes in dysmyelinated axons. Microscopy (Oxf) 2015. [DOI: 10.1093/jmicro/dfv296] [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: 11/15/2022] Open
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Saitoh Y, Hamano A, Mochida K, Kakeya A, Uno M, Tsuruyama E, Ichikawa H, Tokunaga F, Utsunomiya A, Watanabe T, Yamaoka S. A20 targets caspase-8 and FADD to protect HTLV-I-infected cells. Leukemia 2015; 30:716-27. [PMID: 26437781 DOI: 10.1038/leu.2015.267] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 08/31/2015] [Accepted: 09/18/2015] [Indexed: 12/15/2022]
Abstract
Adult T-cell leukemia (ATL) arises from a human T-cell leukemia virus type I (HTLV-I)-infected cell and has few therapeutic options. Here, we have uncovered a previously unrecognized role for a ubiquitin-editing enzyme A20 in the survival of HTLV-I-infected cells. Unlike in lymphomas of the B-cell lineage, A20 is abundantly expressed in primary ATL cells without notable mutations. Depletion of A20 in HTLV-I-infected cells resulted in caspase activation, cell death induction and impaired tumorigenicity in mouse xenograft models. Mechanistically, A20 stably interacts with caspase-8 and Fas-associated via death domain (FADD) in HTLV-I-infected cells. Mutational studies revealed that A20 supports the growth of HTLV-I-infected cells independent of its catalytic functions and that the zinc-finger domains are required for the interaction with and regulation of caspases. These results indicate a pivotal role for A20 in the survival of HTLV-I-infected cells and implicate A20 as a potential therapeutic target in ATL.
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Affiliation(s)
- Y Saitoh
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - A Hamano
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - K Mochida
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - A Kakeya
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - M Uno
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan.,Department of Comprehensive Reproductive Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - E Tsuruyama
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - H Ichikawa
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - F Tokunaga
- Laboratory of Molecular Cell Biology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma, Japan
| | - A Utsunomiya
- Department of Hematology, Imamura Bun-in Hospital, Kagoshima, Japan
| | - T Watanabe
- Department of Medical Genome Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - S Yamaoka
- Department of Molecular Virology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
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Sekine Y, Saitoh Y, Koh E, Hata A, Suzuki H, Yoshino I. P-177CAN THE VERTEBRAL ARTERY BE SACRIFICED? TECHNICAL ASPECTS OF SUBCLAVIAN ARTERY RECONSTRUCTION FOR T4 LUNG CANCER. Interact Cardiovasc Thorac Surg 2015. [DOI: 10.1093/icvts/ivv204.177] [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: 11/14/2022] Open
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Miyamoto Y, Torii T, Takada S, Ohno N, Saitoh Y, Nakamura K, Ito A, Ogata T, Terada N, Tanoue A, Yamauchi J. Involvement of the Tyro3 receptor and its intracellular partner Fyn signaling in Schwann cell myelination. Mol Biol Cell 2015. [PMID: 26224309 PMCID: PMC4591693 DOI: 10.1091/mbc.e14-05-1020] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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] [Indexed: 01/06/2023] Open
Abstract
During early development of the peripheral nervous system, Schwann cell precursors proliferate, migrate, and differentiate into premyelinating Schwann cells. After birth, Schwann cells envelop neuronal axons with myelin sheaths. Although some molecular mechanisms underlying myelination by Schwann cells have been identified, the whole picture remains unclear. Here we show that signaling through Tyro3 receptor tyrosine kinase and its binding partner, Fyn nonreceptor cytoplasmic tyrosine kinase, is involved in myelination by Schwann cells. Impaired formation of myelin segments is observed in Schwann cell neuronal cultures established from Tyro3-knockout mouse dorsal root ganglia (DRG). Indeed, Tyro3-knockout mice exhibit reduced myelin thickness. By affinity chromatography, Fyn was identified as the binding partner of the Tyro3 intracellular domain, and activity of Fyn is down-regulated in Tyro3-knockout mice, suggesting that Tyro3, acting through Fyn, regulates myelination. Ablating Fyn in mice results in reduced myelin thickness. Decreased myelin formation is observed in cultures established from Fyn-knockout mouse DRG. Furthermore, decreased kinase activity levels and altered expression of myelination-associated transcription factors are observed in these knockout mice. These results suggest the involvement of Tyro3 receptor and its binding partner Fyn in Schwann cell myelination. This constitutes a newly recognized receptor-linked signaling mechanism that can control Schwann cell myelination.
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Affiliation(s)
- Yuki Miyamoto
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Tomohiro Torii
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Shuji Takada
- Department of Systems BioMedicine, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Nobuhiko Ohno
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi 409-3898, Japan
| | - Yurika Saitoh
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi 409-3898, Japan
| | - Kazuaki Nakamura
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Akihito Ito
- Research Center, Nissei Bilis, Koga, Shiga 528-0052, Japan
| | - Toru Ogata
- Department of Rehabilitation for the Movement Functions, National Rehabilitation Center for Persons with Disabilities Research Institute, Tokorozawa, Saitama 359-8555, Japan
| | - Nobuo Terada
- Graduate School of Medicine, Shinshu University, Matsumoto, Nagano 390-8621, Japan
| | - Akito Tanoue
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Setagaya, Tokyo 157-8535, Japan Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo, Tokyo 113-8510, Japan )
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Saitoh Y, Yoshimoto T, Kato S, Miwa N. Synergic carcinostatic effects of ascorbic acid and hyperthermia on Ehrlich ascites tumor cell. Exp Oncol 2015; 37:94-99. [PMID: 26112934] [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: 06/04/2023]
Abstract
AIM In this study, we evaluated the carcinostatic effects of combined ascorbic acid (AsA) and a capacitive-resistive electric transfer (CRet) hyperthermic apparatus-induced hyperthermic treatment on Ehrlich ascites tumor (EAT) cells. MATERIALS AND METHODS EAT cells were exposed to various AsA (0-10 mM) concentrations for 1 h; they subsequently underwent CRet treatment for 15 min at 42 °C. Cell viability was assessed by the WST-8 assay 24 h after the combined treatment. Reactive oxygen species involvement was evaluated using catalase and tempol; caspase-3/7 activation was determined by their fluorescent substrates; cell proliferation were estimated by time-lapse observation. The effect on the cell cycle was analyzed by flow cytometry. RESULTS Combined AsA and CRet treatment synergistically suppressed cell viability compared with either treatment alone, and these synergistically carcinostatic effects were evident even at noncytotoxic concentrations of AsA alone (≤ 2 mM). The carcinostatic effects of combined AsA and CRet treatment were attenuated in a dose-dependent manner by catalase addition, but not by the superoxide anion radical scavenger tempol. Time-lapse observation revealed that combined AsA and CRet treatment activated caspase-3/7 at 10-24 h after treatment, accompanied by significant cell growth suppression. Cell cycle analysis revealed that the rate of sub-G1-phase (apoptotic) cells was drastically increased at 12 h and 24 h, and that the G2/M-phase cells gradually increased at 6-24 h after treatment. CONCLUSION These results indicate that combined AsA and CRet treatment synergistically inhibits EAT cell growth through G2/M arrest and apoptosis induction via H2O2 generation at lower AsA concentrations; this carcinostatic effect cannot be exerted by AsA alone.
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Affiliation(s)
- Y Saitoh
- Laboratory of Bioscience & Biotechnology for Cell Function Control, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima 727-0023, Jap
| | - T Yoshimoto
- Laboratory of Bioscience & Biotechnology for Cell Function Control, Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima, 562 Nanatsuka, Shobara, Hiroshima 727-0023, Jap
| | - S Kato
- Radioisotope Facilities for Medical Science, Life Science Research Center, Mie University, 2-174 Edobashi, Tsu, Mie 514-8507, Japan
| | - N Miwa
- Department of Radiological Technology, Faculty of Health Sciences, Butsuryo College of Osaka, 3-33 Ohtorikita-machi, Sakai, Osaka 593-8324, Japan
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Kinoshita M, Tanaka H, Arita H, Goto Y, Oshino S, Watanabe Y, Yoshimine T, Saitoh Y. Pituitary-Targeted Dynamic Contrast-Enhanced Multisection CT for Detecting MR Imaging-Occult Functional Pituitary Microadenoma. AJNR Am J Neuroradiol 2015; 36:904-8. [PMID: 25593201 DOI: 10.3174/ajnr.a4220] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [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: 09/24/2014] [Accepted: 11/02/2014] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Although resection of a tumor by trans-sphenoidal surgery is considered the criterion standard for successful surgical treatment of functional pituitary microadenoma, MR imaging occasionally fails to visualize and identify the tumor and supplementary imaging modalities are necessary. We tested the possibility of dynamic contrast-enhanced multisection CT of the pituitary gland accompanying image reconstruction of contrast agent dynamics to identify the localizations of microadenomas and compared the diagnostic performance with conventional pituitary-targeted MR imaging. MATERIALS AND METHODS Twenty-eight patients with surgically confirmed functional pituitary microadenomas (including growth hormone-, adrenocorticotropic hormone-, and prolactin-secreting adenomas) who underwent pituitary-targeted dynamic contrast-enhanced multisection CT were retrospectively investigated. We undertook image reconstruction of the dynamics of the contrast agent around the pituitary gland in a voxelwise manner, visualizing any abnormality and enabling qualification of contrast dynamics within the tumor. RESULTS Fifteen cases were correctly diagnosed by MR imaging, while dynamic contrast-enhanced multisection CT correctly diagnosed 26 cases. The accuracy of localization was markedly better for adrenocorticotropic hormone-secreting microadenomas, increasing from 32% on MR imaging to 85% by dynamic contrast-enhanced multisection CT. Compared with the normal pituitary gland, adrenocorticotropic hormone-secreting adenoma showed the least difference in contrast enhancement of the different functional microadenomas. Images acquired at 45-60 seconds after contrast agent injection showed the largest difference in contrast enhancement between an adenoma and the normal pituitary gland. CONCLUSIONS Dynamic contrast-enhanced multisection CT combined with image reconstruction of the contrast-enhanced dynamics holds promise in detecting MR imaging-occult pituitary microadenomas.
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Affiliation(s)
- M Kinoshita
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.) Department of Neurosurgery (M.K.), Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
| | - H Tanaka
- Radiology (H.T., Y.W.), Osaka University Graduate School of Medicine, Osaka, Japan
| | - H Arita
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.)
| | - Y Goto
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.)
| | - S Oshino
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.)
| | - Y Watanabe
- Radiology (H.T., Y.W.), Osaka University Graduate School of Medicine, Osaka, Japan
| | - T Yoshimine
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.)
| | - Y Saitoh
- From the Departments of Neurosurgery (M.K., H.A., Y.G., S.O., T.Y., Y.S.) Department of Neuromodulation and Neurosurgery (Y.S.), Osaka University Graduate School of Medicine, Center of Medical Innovation and Translational Research, Osaka, Japan.
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50
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Fukasawa Y, Ohno N, Saitoh Y, Saigusa T, Arita J, Ohno S. Immunohistochemical and morphofunctional studies of skeletal muscle tissues with electric nerve stimulation by in vivo cryotechnique. Acta Histochem Cytochem 2015; 48:27-36. [PMID: 26019372 PMCID: PMC4427562 DOI: 10.1267/ahc.14068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 03/03/2015] [Indexed: 11/22/2022] Open
Abstract
In this study, morphological and immunohistochemical alterations of skeletal muscle tissues during persistent contraction were examined by in vivo cryotechnique (IVCT). Contraction of gastrocnemius muscles was induced by sciatic nerve stimulation. The IVCT was performed immediately, 3 min or 10 min after the stimulation start. Prominent ripples of muscle fibers or wavy deformation of sarcolemma were detected immediately after the stimulation, but they gradually diminished to normal levels during the stimulation. The relative ratio of sarcomere and A band lengths was the highest in the control group, but it immediately decreased to the lowest level and then gradually recovered at 3 min or 10 min. Although histochemical intensity of PAS reaction was almost homogeneous in muscle tissues of the control group or immediately after the stimulation, it decreased at 3 min or 10 min. Serum albumin was immunolocalized as dot-like patterns within some muscle fibers at 3 min stimulation. These patterns became more prominent at 10 min, and the dots got larger and saccular in some sarcoplasmic regions. However, IgG1 and IgM were immunolocalized in blood vessels under nerve stimulation conditions. Therefore, IVCT was useful to capture the morphofunctional and metabolic changes of heterogeneous muscle fibers during the persistent contraction.
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Affiliation(s)
- Yuki Fukasawa
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Nobuhiko Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Yurika Saitoh
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Takeshi Saigusa
- First Department of Physiology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Jun Arita
- First Department of Physiology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
| | - Shinichi Ohno
- Department of Anatomy and Molecular Histology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
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