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Sakai Y, Shirasaka T, Hioki K, Yamane S, Kinoshita E, Kato T. Effects of scan parameters on the accuracies of iodine quantification and hounsfield unit values in dual layer dual-energy head and neck computed tomography: A phantom study conducted in a hospital in Japan. Radiography (Lond) 2023; 29:838-844. [PMID: 37393738 DOI: 10.1016/j.radi.2023.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 06/14/2023] [Accepted: 06/18/2023] [Indexed: 07/04/2023]
Abstract
INTRODUCTION No study has investigated scan parameters in head and neck dual layer dual-energy computed tomography (DL-DECT). This study aimed to select the appropriate scan parameters in head and neck imaging by evaluating the scan parameter effects on the accuracies of CT numbers and conduct iodine quantification in DL-DECT. METHODS A multi-energy phantom was scanned using a dual layer CT (DLCT) scanner. Reference materials of iodine, blood, calcium, and adipose were used. A helical scan was performed by using reference and several protocols. Iodine density and virtual monochromatic images (VMIs) at the energy of 50, 70, and 100 keV were reconstructed. The iodine concentrations and CT numbers in each protocol were measured. Moreover, the absolute percentage errors (APEs) of iodine quantifications and CT numbers (reference vs. each protocol) were compared. Equivalence was observed when APEs between reference and each protocol was within 5%. Statistical analysis was performed using appropriate software. RESULTS The APEs between the high-tube-voltage and reference protocol were 23.7, 14.0, 8.8, and 8.1% for iodine reference materials with concentrations equal to 2, 5, 10, and 15 mg/ml, respectively. At 50 keV, APEs between the high-tube-voltage and reference protocols were greater than 5% except for calcium and adipose. At 100 keV, APEs between the high-tube-voltage and reference protocols were greater than 5% except for blood and calcium. CONCLUSIONS The high-tube-voltage protocol improved the accuracies of the measurement for iodine quantification and CT numbers. Additionally, the scanning parameters except for tube voltage had no effect on accuracies of iodine quantitation and CT numbers in the DLCT scanner. IMPLICATIONS FOR PRACTICE The use of the high-tube-voltage protocol will be recommended for more accurate material decomposition in head and neck DL-DECT.
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Affiliation(s)
- Y Sakai
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - T Shirasaka
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - K Hioki
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - S Yamane
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - E Kinoshita
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - T Kato
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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Shirasaka T, Kojima T, Yamane S, Mikayama R, Kawakubo M, Funatsu R, Kato T, Ishigami K, Funama Y. Effect of iodine concentration and body size on iodine subtraction in virtual non-contrast imaging: A phantom study. Radiography (Lond) 2023; 29:557-563. [PMID: 36965243 DOI: 10.1016/j.radi.2023.03.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 02/19/2023] [Accepted: 03/05/2023] [Indexed: 03/27/2023]
Abstract
INTRODUCTION Dual-energy computed tomography (DECT) can generate virtual non-contrast (VNC) images. Herein, we sought to improve the accuracy of VNC images by identifying the optimal slope of contrast media (SCM) for VNC-image generation based on the iodine concentration and subject's body size. METHODS We used DECT to scan a multi-energy phantom including four iodine concentration rods (15, 10, 5, and 2 mg/mL), and 240 VNC images (eight SCM ranging from 0.49 to 0.56 × three body sizes × ten scans) that were generated by three-material decomposition. The CT number of each iodine and solid water rod part was measured in each VNC image. The difference in the CT number between the iodine and the solid water rod part was calculated and compared using paired t-test or repeated measures ANOVA. RESULTS The SCM that achieved an absolute value of the difference in CT number of <5.0 Hounsfield units (HU) for all body sizes simultaneously was greater at lower iodine concentration (SCM of 0.5, 0.51, and 0.53 at 10, 5, and 2 mg/mL iodine, respectively). At an iodine concentration of 15 mg/mL, no SCM achieved an absolute difference of <5.0 HU in CT number for all body sizes simultaneously. At all iodine concentrations, the SCM achieving the minimal difference in the CT number increased with the increase in body size. CONCLUSION By adjusting the SCM according to the iodine concentration and body size, it is possible to generate VNC images with an accuracy of <5.0 HU. IMPLICATIONS FOR PRACTICE Improving the accuracy of VNC images minimizing incomplete iodine subtraction would make it possible to replace true non-contrast (TNC) images with VNC images and reduce the radiation dose.
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Affiliation(s)
- T Shirasaka
- Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto, 862-0976, Japan; Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - T Kojima
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan; Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - S Yamane
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - R Mikayama
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - M Kawakubo
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - R Funatsu
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - T Kato
- Division of Radiology, Department of Medical Technology, Kyushu University Hospital, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - K Ishigami
- Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi Ward, Fukuoka, 812-8582, Japan.
| | - Y Funama
- Department of Medical Radiation Sciences, Faculty of Life Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto, 862-0976, Japan.
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Muromachi S, Kida M, Morimoto M, Yamane S, Takeya S. Designing the structure and relevant properties of semiclathrate hydrates by partly asymmetric alkylammonium salts. Phys Chem Chem Phys 2022; 24:18198-18204. [PMID: 35866353 DOI: 10.1039/d2cp02625b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Semiclathrate hydrates are host-guest materials that form from ionic guests and water. There are numerous options for ionic guests, such as quaternary ammonium salts, to tune the functional properties of these materials such as melting temperature, fusion heat, and gas capacity and selectivity. To design these materials, the stabilization mechanism of the side chains of quaternary ammonium salts must be understood based on both thermodynamic and crystallographic properties and relevant host-guest dynamics. In this paper, we studied semiclathrate hydrates formed from n-propyl, tri-n-butylammonium bromide (N3444Br) and tri-n-butyl, n-pentylammonium bromide (N4445Br). Their cation side chains are decremented or incremented from tetra-n-butylammonium (N4444 or TBA), which is one of the best fits for semiclathrate hydrate structures. The use of the widely used tetra-n-butylammonium bromide (N4444Br or TBAB) as an ionic guest, an increment of the carbon chain, i.e., N4445Br, caused disorders in its hydrate structure due to the oversizing of the cation. This suitably oversized cation selectively stabilized the orthorhombic structure, whose hydration number is relatively high. As a result, the fusion heat at the congruent composition of the hydrate phase was higher than that of the widely used N4444Br (TBAB) hydrates. The N3444Br hydrate showed both significantly decreased melting temperature and fusion heat compared to the N4444Br (TBAB) hydrates. The phase behaviour of the N3444Br hydrate was found to be analogous to that of the N4444Br (TBAB) hydrates. It was demonstrated that the semiclathrate hydrate structures and relevant properties can be modified by adjusting the alkyl side chain length of quaternary ammonium salts.
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Affiliation(s)
- Sanehiro Muromachi
- Energy Process Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, 305-8569, Japan.
| | - Masato Kida
- Faculty of Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Hokkaido, Japan
| | - Masato Morimoto
- Energy Process Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, 305-8569, Japan.
| | - Shogo Yamane
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Satoshi Takeya
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Japan
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Yin C, Mukaida M, Horike S, Kirihara K, Yamane S, Zhang Z, Wei Q. Design and synthesis of proton-dopable organic semiconductors. RSC Adv 2022; 12:6748-6754. [PMID: 35424629 PMCID: PMC8981859 DOI: 10.1039/d2ra00216g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 02/19/2022] [Indexed: 01/30/2023] Open
Abstract
This paper shows how protonated 3,4-ethylene dioxythiophene moieties can be used as an end group to make organic conductors. An organic semiconductor 2,5-bis(5-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-3-dodecylthiophen-2-yl)thieno[3,2-b]thiophene is designed and synthesized. This molecule could be doped by protonic acid in both solution and solid-state, resulting in a broad absorption in the near-infrared range corresponding to polaron and bipolaron absorption. Electrical conductivity of ca. 0.1 S cm−1 was obtained at 100 °C (to avoid the water uptake by the acid). The adducts with protons bound at the end-thiophene α-position were confirmed by 1H Nuclear Magnetic Resonance spectra. The use of protonated 3,4-ethylenedioxythiophene moieties as an end group could be a promising approach to prepare organic conductors.![]()
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Affiliation(s)
- Chenzhu Yin
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 305-8572 Japan.,Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Masakazu Mukaida
- Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Shohei Horike
- Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan .,Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University 1-1 Rokkodai-cho Kobe 657-8501 Japan
| | - Kazuhiro Kirihara
- Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Shogo Yamane
- Research Institute for Sustainable Chemistry, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1, Tennodai Tsukuba Ibaraki 305-8572 Japan
| | - Qingshuo Wei
- Nanomaterials Research Institute, Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
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Muensterman DJ, Titaley IA, Peaslee GF, Minc LD, Cahuas L, Rodowa AE, Horiuchi Y, Yamane S, Fouquet TNJ, Kissel JC, Carignan CC, Field JA. Disposition of Fluorine on New Firefighter Turnout Gear. Environ Sci Technol 2022; 56:974-983. [PMID: 34961317 DOI: 10.1021/acs.est.1c06322] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Firefighter turnout gear is essential for reducing occupational exposure to hazardous chemicals during training and fire events. Per-and polyfluoroalkyl substances (PFASs) are observed in firefighter serum, and possible occupational sources include the air and dust of fires, aqueous film-forming foam, and turnout gear. Limited data exist for nonvolatile and volatile PFASs on firefighter turnout gear and the disposition of fluorine on the individual layers of turnout gear. Further implications for exposure to fluorine on turnout gear are not well understood. Three unused turnout garments purchased in 2019 and one purchased in 2008, were analyzed for 50 nonvolatile and 15 volatile PFASs by liquid chromatography quadrupole time-of-flight mass spectrometry (LC-qTOF-MS) and gas chromatography-mass spectrometry (GC-MS), respectively. Particle-induced gamma ray emission (PIGE), a surface technique, and instrumental neutron activation analysis (INAA), a bulk technique, were used to measure total fluorine. Bulk characterization of the layers by pyrolysis-GC/MS (py-GC/MS) was used to differentiate fluoropolymer (e.g., PTFE) films from textile layers finished with side-chain polymers. The outer layer, moisture barrier, and thermal layers of the turnout gear all yielded measured concentrations of volatile PFASs that exceeded nonvolatile PFAS concentrations, but the summed molar concentrations made up only a small fraction of total fluorine (0.0016-6.7%). Moisture barrier layers comprised a PTFE film, as determined by py-GC-MS, and gave the highest individual nonvolatile (0.159 mg F/kg) and volatile PFAS (20.7 mg F/kg) as well as total fluorine (122,000 mg F/kg) concentrations. Outer and thermal layers comprised aromatic polyamide-based fibers (aramid) treated with side-chain fluoropolymers and had lower levels of individual nonvolatile and volatile PFASs. Equal concentrations of total fluorine by both PIGE and INAA on the outer and thermal layers is consistent with treatment with a side-chain fluoropolymer coating. New turnout gear should be examined as a potential source of firefighter occupational exposure to nonvolatile and volatile PFASs in future assessments.
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Affiliation(s)
- Derek J Muensterman
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Ivan A Titaley
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331, United States
| | - Graham F Peaslee
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Leah D Minc
- Radiation Center, Oregon State University, Corvallis, Oregon 97311, United States
| | - Liliana Cahuas
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Alix E Rodowa
- Hollings Marine Laboratory, National Institute of Standards and Technology, Charleston, South Carolina 29412, United States
| | - Yuki Horiuchi
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Shogo Yamane
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Thierry N J Fouquet
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - John C Kissel
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, United States
| | - Courtney C Carignan
- Department of Food Science and Human Nutrition, Department of Pharmacology and Toxicology, Michigan State University, East Lansing, Michigan 48824, United States
| | - Jennifer A Field
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331, United States
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Yamane S, Nakamura S, Inoue R, Fouquet TNJ, Satoh T, Kinoshita K, Sato H. Determination of the Block Sequence of Linear Triblock Copolyethers Using Thermal Desorption/Pyrolysis Direct Analysis in Real-Time Mass Spectrometry. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01425] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shogo Yamane
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Sayaka Nakamura
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Ryota Inoue
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Thierry N. J. Fouquet
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Takaya Satoh
- JEOL, Ltd., 3-1-2, Musashino, Akishima, Tokyo 196-8558, Japan
| | | | - Hiroaki Sato
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Uchimaru T, Yamane S, Mizukado J, Tsuzuki S. Thermal stabilities and conformational behaviors of isocyanurates and cyclotrimerization energies of isocyanates: a computational study. RSC Adv 2020; 10:15955-15965. [PMID: 35493671 PMCID: PMC9052385 DOI: 10.1039/d0ra02463e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 03/03/2020] [Accepted: 04/06/2020] [Indexed: 11/21/2022] Open
Abstract
Computational investigations on how the thermochemical stabilities of isocyanurate molecules depend on the substituents on the nitrogen atoms in the isocyanurate ring have been described.
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Affiliation(s)
- Tadafumi Uchimaru
- Research Institute for Sustainable Chemistry
- National Institute of Advanced Industrial Science and Technology
- Tsukuba
- Japan
| | - Shogo Yamane
- Research Institute for Sustainable Chemistry
- National Institute of Advanced Industrial Science and Technology
- Tsukuba
- Japan
| | - Junji Mizukado
- Research Institute for Sustainable Chemistry
- National Institute of Advanced Industrial Science and Technology
- Tsukuba
- Japan
| | - Seiji Tsuzuki
- Research Center for Computational Design of Advanced Functional Materials
- National Institute of Advanced Industrial Science and Technology
- Tsukuba
- Japan
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Ata S, Yamane S, Hayashi Y, Kawauchi S, Mizukado J, Yamada T, Hata K. Improving the Acid and Base Resistance of Polyurethane Using Carbon Nanotubes. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Seisuke Ata
- CNT‐Application Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba‐shi Ibaraki‐ken 305‐8565 Japan
| | - Shogo Yamane
- Research Institute of Sustainable Chemistry National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba‐shi Ibaraki‐ken 305‐8565 Japan
| | - Yoshihiro Hayashi
- Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 1‐12‐1 Ookayama, Meguro‐Ku Tokyo 152‐8552 Japan
| | - Susumu Kawauchi
- Department of Chemical Science and Engineering School of Materials and Chemical Technology Tokyo Institute of Technology 1‐12‐1 Ookayama, Meguro‐Ku Tokyo 152‐8552 Japan
| | - Junji Mizukado
- Research Institute of Sustainable Chemistry National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba‐shi Ibaraki‐ken 305‐8565 Japan
| | - Takeo Yamada
- CNT‐Application Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba‐shi Ibaraki‐ken 305‐8565 Japan
| | - Kenji Hata
- CNT‐Application Research Center National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1‐1‐1 Higashi Tsukuba‐shi Ibaraki‐ken 305‐8565 Japan
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Ishida T, Kitagaki R, Yamane S, Hagihara H. Temperature dependence of structural alteration by ultraviolet irradiation in acrylic-urethane coatings studied by positron annihilation spectroscopy and solvent swelling behavior. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.02.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Yamane S, Suzuki Y, Mizukado J. Photostability of Poly(3-hexylthiophene) (P3HT) in P3HT:Fullerene Films: Effects of Dispersed Structures of Fullerene Derivatives. BCSJ 2018. [DOI: 10.1246/bcsj.20180087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shogo Yamane
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yasumasa Suzuki
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Junji Mizukado
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Chen L, Kutsuna S, Yamane S, Mizukado J. ESR spin trapping determination of the hydroperoxide concentration in polyethylene oxide (PEO) in aqueous solution. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2017.04.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Tachibana T, Kodama T, Yamane S, Makino R, Khan SI, Cline MA. Possible role of central interleukins on the anorexigenic effect of lipopolysaccharide in chicks. Br Poult Sci 2017; 58:305-311. [DOI: 10.1080/00071668.2017.1280774] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- T. Tachibana
- Department of Agrobiological Science, Faculty of Agriculture, Ehime University, Matsuyama, Japan
| | - T. Kodama
- Department of Agrobiological Science, Faculty of Agriculture, Ehime University, Matsuyama, Japan
| | - S. Yamane
- Department of Agrobiological Science, Faculty of Agriculture, Ehime University, Matsuyama, Japan
| | - R. Makino
- Department of Agrobiological Science, Faculty of Agriculture, Ehime University, Matsuyama, Japan
| | - S. I. Khan
- Department of Anatomy and Embryology, Ehime University Graduate School of Medicine, Toon 791-0212, Ehime, Japan
| | - M. A. Cline
- Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
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Yamane S, Ata S, Chen L, Sato H, Yamada T, Hata K, Mizukado J. Experimental analysis of stabilizing effects of carbon nanotubes (CNTs) on thermal oxidation of poly(ethylene glycol)–CNT composites. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.12.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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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Koda K, Hyakkoku K, Ogawa K, Takasu K, Imai S, Sakurai Y, Fujita M, Ono H, Yamamoto M, Fukuda I, Yamane S, Morita A, Asaki T, Kanemasa T, Sakaguchi G, Morioka Y. Sensitization of TRPV1 by protein kinase C in rats with mono-iodoacetate-induced joint pain. Osteoarthritis Cartilage 2016; 24:1254-62. [PMID: 26970286 DOI: 10.1016/j.joca.2016.02.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 02/10/2016] [Accepted: 02/26/2016] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To assess the functional changes of Transient receptor potential vanilloid 1 (TRPV1) receptor and to clarify its mechanism in a rat mono-iodoacetate (MIA)-induced joint pain model (MIA rats), which has joint degeneration with cartilage loss similar to osteoarthritis. METHODS Sensitization of TRPV1 in MIA rats was assessed by transient spontaneous pain behavior induced by capsaicin injection in knee joints and electrophysiological changes of dorsal root ganglion (DRG) neurons innervating knee joints in response to capsaicin. Mechanisms of TRPV1 sensitization were analyzed by a newly developed sandwich enzyme-linked immunosorbent assay that detects phosphorylated TRPV1, followed by functional and expression analyses of protein kinase C (PKC) in vivo and in vitro, which involves TRPV1 phosphorylation. RESULTS Pain-related behavior induced by intra-articular injection of capsaicin was significantly increased in MIA rats compared with sham rats. In addition, capsaicin sensitivity, evaluated by capsaicin-induced inward currents, was significantly increased in DRG neurons of MIA rats. Protein levels of TRPV1 remained unchanged, but phosphorylated TRPV1 at Ser800 increased in DRG neurons of MIA rats. Phosphorylated-PKCɛ (p-PKCɛ) increased and co-localized with TRPV1 in DRG neurons of MIA rats. Capsaicin-induced pain-related behavior in MIA rats was inhibited by intra-articular pretreatment of the PKC inhibitor bisindolylmaleimide I. In addition, intra-articular injection of the PKC activator phorbol 12-myristate 13-acetate increased capsaicin-induced pain-related behavior in normal rats. CONCLUSION TRPV1 was sensitized at the knee joint and at DRG neurons of MIA rats through PKC activation. Thus, TRPV1 sensitization might be involved in chronic pain caused by osteoarthritis.
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Affiliation(s)
- K Koda
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - K Hyakkoku
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - K Ogawa
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - K Takasu
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - S Imai
- Antibody Therapeutics, Discovery Research Laboratory for Innovative Frontier Medicines, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - Y Sakurai
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - M Fujita
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - H Ono
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - M Yamamoto
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - I Fukuda
- Biomarker, Biotechnology-Based Medicine, Discovery Research Laboratory for Innovative Frontier Medicines, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - S Yamane
- Antibody Therapeutics, Discovery Research Laboratory for Innovative Frontier Medicines, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - A Morita
- Biomarker, Biotechnology-Based Medicine, Discovery Research Laboratory for Innovative Frontier Medicines, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - T Asaki
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - T Kanemasa
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - G Sakaguchi
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
| | - Y Morioka
- Pain & Neuroscience, Discovery Research Laboratories for Core Therapeutic Areas, Shionogi & Co., Ltd., 1-1 Futaba-cho, 3-chome, Toyonaka, Osaka 561-0825, Japan.
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Sagara Y, Yamane S, Mitani M, Weder C, Kato T. Mechanoresponsive Luminescent Molecular Assemblies: An Emerging Class of Materials. Adv Mater 2016; 28:1073-95. [PMID: 26461848 DOI: 10.1002/adma.201502589] [Citation(s) in RCA: 435] [Impact Index Per Article: 54.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 07/19/2015] [Indexed: 05/05/2023]
Abstract
The possibility to change the molecular assembled structures of organic and organometallic materials through mechanical stimulation is emerging as a general and powerful concept for the design of functional materials. In particular, the photophysical properties such as photoluminescence color, quantum yield, and emission lifetime of organic and organometallic fluorophores can significantly depend on the molecular packing, enabling the development of molecular materials with mechanoresponsive luminescence characteristics. Indeed, an increasing number of studies have shown in recent years that mechanical force can be utilized to change the molecular arrangement, and thereby the optical response, of luminescent molecular assemblies of π-conjugated organic or organometallic molecules. Here, the development of such mechanoresponsive luminescent (MRL) molecular assemblies consisting of organic or organometallic molecules is reviewed and emerging trends in this research field are summarized. After a brief introduction of mechanoresponsive luminescence observed in molecular assemblies, the concept of "luminescent molecular domino" is introduced, before molecular materials that show turn-on/off of photoluminescence in response to mechanical stimulation are reviewed. Mechanically stimulated multicolor changes and water-soluble MRL materials are also highlighted and approaches that combine the concept of MRL molecular assemblies with other materials types are presented in the last part of this progress report.
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Affiliation(s)
- Yoshimitsu Sagara
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, Fribourg, CH-1700, Switzerland
| | - Shogo Yamane
- National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1, Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Masato Mitani
- Department of Chemistry and Biotechnology, School of Engineering, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Christoph Weder
- Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, Fribourg, CH-1700, Switzerland
| | - Takashi Kato
- Department of Chemistry and Biotechnology, School of Engineering, the University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Mizukado J, Sato H, Chen L, Suzuki Y, Yamane S, Aoyama Y, Suda H. High-resolution MALDI-TOF MS study on analysis of low-molecular-weight products from photo-oxidation of poly(3-hexylthiophene). J Mass Spectrom 2015; 50:1006-1012. [PMID: 28338270 DOI: 10.1002/jms.3614] [Citation(s) in RCA: 7] [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] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 04/13/2015] [Accepted: 05/09/2015] [Indexed: 06/06/2023]
Abstract
High-resolution matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectrometry (TOF MS) was used for the analysis of the low-molecular-weight products from the photo-oxidation of poly(3-hexylthiophene) (P3HT) in solution and thin film. Eight new peak series were observed in the low-mass range of the mass spectra of the products degraded in solution, and the formulas of the eight components were determined from the accurate mass. From SEC/MALDI-TOF MS, two components were identified as the degraded products, and the other six components were derived from the fragmentation of the degraded products during the MALDI process. A mechanism for the formation of these components was proposed on the basis of the results of MALDI-TOF MS. For the thin film degradation, a part of products in the solution degradation were observed, which supports that the oxidation of P3HT in solution and thin film proceeded in the same mechanism. This study shows that high-resolution MALDI-TOF MS is effective for the analysis of the low-molecular-weight products from P3HT photo-oxidation and expected to be feasible for the degradation analyses of other polymers. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Junji Mizukado
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Innovation in Sustainable Chemistry, Tsukuba, Ibaraki, 305-8565, Japan
| | - Hiroaki Sato
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Environmental Management Technology, Tsukuba, Ibaraki, 305-8569, Japan
| | - Liang Chen
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Innovation in Sustainable Chemistry, Tsukuba, Ibaraki, 305-8565, Japan
| | - Yasumasa Suzuki
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Innovation in Sustainable Chemistry, Tsukuba, Ibaraki, 305-8565, Japan
| | - Shogo Yamane
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Innovation in Sustainable Chemistry, Tsukuba, Ibaraki, 305-8565, Japan
| | - Yoshinori Aoyama
- National Institute of Advanced Industrial Science and Technology (AIST), Research Center for Photovoltaic Technologies, Tsukuba, Ibaraki, 305-8565, Japan
- Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Midori-ku, Yokohama, 226-8503, Japan
| | - Hiroyuki Suda
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Innovation in Sustainable Chemistry, Tsukuba, Ibaraki, 305-8565, Japan
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Abstract
To prevent insufficiency of the triceps after total elbow arthroplasty, we have, since 2008, used a triceps-sparing ulnar approach. This study evaluates the clinical results and post-operative alignment of the prosthesis using this approach. We reviewed 25 elbows in 23 patients. There were five men and 18 women with a mean age of 69 years (54 to 83). There were 18 elbows with rheumatoid arthritis, six with a fracture or pseudoarthrosis and one elbow with osteoarthritis. Post-operative complications included one intra-operative fracture, one elbow with heterotopic ossification, one transient ulnar nerve palsy, and one elbow with skin necrosis, but no elbow was affected by insufficiency of the triceps. Patients were followed for a mean of 42 months (24 to 77). The mean post-operative Japanese Orthopaedic Association Elbow Score was 90.8 (51 to 100) and the mean Mayo Elbow Performance score 93.8 (65 to 100). The mean post-operative flexion/extension of the elbow was 135°/-8°. The Manual Muscle Testing score of the triceps was 5 in 23 elbows and 2 in two elbows (one patient). The mean alignment of the implants examined by 3D-CT was 2.8° pronation (standard deviation (sd) 5.5), 0.3° valgus (sd 2.7), and 0.7° extension (sd 3.2) for the humeral component, and 9.3° pronation (sd 9.7), 0.3° valgus (sd 4.0), and 8.6° extension (sd 3.1) for the ulnar component. There was no radiolucent line or loosening of the implants on the final radiographs. The triceps-sparing ulnar approach allows satisfactory alignment of the implants, is effective in preventing post-operative triceps insufficiency, and gives satisfactory short-term results. Cite this article: 2015;97-B:1096–1101.
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Affiliation(s)
- N. Oizumi
- Hokushin Orthopaedic Hospital, 1-18
Kikusuimotomachi 3jo 3chome, Shiroishi-ku, Sapporo, 0030823, Japan
| | - N. Suenaga
- Hokushin Orthopaedic Hospital, 1-18
Kikusuimotomachi 3jo 3chome, Shiroishi-ku, Sapporo, 0030823, Japan
| | - C. Yoshioka
- Hokushin Higashi Hospital, 3-2
Fushiko 5-jou 3-chome, Higashi-ku, Sapporo, Hokkaido
007-0865, Japan
| | - S. Yamane
- Hokushin Higashi Hospital, 3-2
Fushiko 5-jou 3-chome, Higashi-ku, Sapporo, Hokkaido
007-0865, Japan
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Yamane S, Mizukado J, Takahashi T, Suzuki Y, Sakurai M, Hagihara H, Suda H. Fulleropyrrolidine Derivatives with Benzophenone Moiety as Electron Acceptors in Thermally Stable Organic Photovoltaic Devices. CHEM LETT 2015. [DOI: 10.1246/cl.141119] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shogo Yamane
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Junji Mizukado
- National Institute of Advanced Industrial Science and Technology (AIST)
| | | | - Yasumasa Suzuki
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Miho Sakurai
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Hideaki Hagihara
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Hiroyuki Suda
- National Institute of Advanced Industrial Science and Technology (AIST)
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19
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Affiliation(s)
- Shogo Yamane
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Junji Mizukado
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Yasumasa Suzuki
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Miho Sakurai
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Liang Chen
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Hiroyuki Suda
- National Institute of Advanced Industrial Science and Technology (AIST)
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20
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Chen L, Yamane S, Mizukado J, Suzuki Y, Kutsuna S, Uchimaru T, Suda H. ESR study of singlet oxygen generation and its behavior during the photo-oxidation of P3HT in solution. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.02.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [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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21
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Inoue M, Arakawa A, Yamane S, Kadonosono K. Long-term outcome of intravitreal ranibizumab treatment, compared with photodynamic therapy, in patients with polypoidal choroidal vasculopathy. Eye (Lond) 2013; 27:1013-20; quiz 1021. [PMID: 23970023 DOI: 10.1038/eye.2013.179] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 04/15/2013] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To evaluate the functional outcomes of patients with polypoidal choroidal vasculopathy (PCV) who underwent intravitreal ranibizumab (IVR) treatment, compared with photodynamic therapy (PDT), after at least 2 years. METHODS We retrospectively studied all the treatment-naïve patients with PCV who were scheduled to undergo IVR or PDT between August 2005 and June 2010. All the patients who had a 2-year or longer follow-up period were included in the study. The best-corrected visual acuity (BCVA) in the two groups was compared before treatment and at 3, 6, 12, 18 and 24 months after the initial treatment. The regression of the polyps was also assessed using indocyanine green angiography. RESULTS A total of 77 patients were included in this study. Thirty-three eyes were treated with IVR, and 44 eyes were treated with PDT. Although no significant differences between the two groups were observed at baseline or at 3, 6, and 12 months after treatment, a significantly better BCVA was seen in the IVR group, compared with the PDT group, at 18 and 24 months after treatment (P=0.035 and P=0.021, respectively). No significant difference in the rate of polyp regression was observed between the two groups (P=0.092). CONCLUSION IVR was well tolerated and maintained or improved the vision of patients with PCV, compared with PDT, as evaluated at 2-year follow-up examinations. PDT for the treatment of PCV might result in unfavorable outcomes, with no superiority to achieving the involution of polyps.
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Affiliation(s)
- M Inoue
- Department of Ophthalmology, Yokohama City University Medical Center, Yokohama, Japan
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22
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Harashima SI, Tanaka D, Yamane S, Ogura M, Fujita Y, Murata Y, Seike M, Koizumi T, Aono M, Wang Y, Inagaki N. Efficacy and safety of switching from basal insulin to sitagliptin in Japanese type 2 diabetes patients. Horm Metab Res 2013; 45:231-8. [PMID: 22972180 DOI: 10.1055/s-0032-1323763] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Basal-supported oral therapy (BOT) is often used to treat poorly controlled type 2 diabetes. However, patients sometimes experience nocturnal and early morning hypoglycemia. Thus, maintaining targeted glycemic control by BOT is limited in some patients. We assessed the efficacy and safety of replacing basal insulin by sitagliptin therapy in Japanese type 2 diabetes patients on BOT. Forty-nine subjects were sequentially recruited for the 52-week, prospective, single arm study. Patients on BOT therapy were switched from basal insulin to sitagliptin. The primary endpoint was change in HbA1c in 52 weeks. The secondary endpoints were dropout rate, changes in body weight, frequency of hypoglycemia, and relationship between change in HbA1c and insulin secretion capacity evaluated by glucagon loading test. The average dose of basal insulin was 15.0±8.4 units. Sixteen subjects (31.3%) were dropped because replacement by sitagliptin was less effective for glycemic control. In these subjects, diabetes duration was longer, FPG and HbA1c at baseline were higher, and insulin secretion capacity was lower. Change in HbA1c in 52 weeks was - 4 mmol/mol (95% CI - 5 to - 4 mmol/mol) (p<0.05). Change in body weight was - 0.71 kg (95% CI - 1.42 to - 0.004 kg) (p<0.05). Frequency of hypoglycemia was decreased from 1.21±1.05 to 0.06±0.24 times/month. HbA1c level was improved if C-peptide index (CPI) was over 1.19. In conclusion, basal insulin in BOT can be replaced by sitagliptin with a decrease in HbA1c level and frequency of hypoglycemia in cases where insulin secretion capacity was sufficiently preserved.
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Affiliation(s)
- S-I Harashima
- Department of Diabetes and Clinical Nutrition, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
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Yamane S, Sagara Y, Kato T. Steric effects on excimer formation for photoluminescent smectic liquid-crystalline materials. Chem Commun (Camb) 2013; 49:3839-41. [DOI: 10.1039/c3cc00072a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Kondo K, Inoue K, Fujiwara T, Yamane S, Yasutake D, Maeda M, Nagare H, Akao S, Ohtoshi K. Seasonal changes in the performance of a catch crop for mitigating diffuse agricultural pollution. Water Sci Technol 2013; 68:776-782. [PMID: 23985506 DOI: 10.2166/wst.2013.258] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An in situ technology for mitigating diffuse agricultural pollution using catch crops was developed for simultaneously preventing nitrate groundwater pollution, reducing nitrous oxide (N2O) gas emissions, and removing salts from the topsoil. Seasonal changes in the performance of a catch crop were investigated using lysimeters in a full-scale greenhouse experiment with 50 d cultivation of dent corn. Catch crop cultivation significantly reduced the leached mineral nitrogen by 89-91% in summer, 87-89% in spring, and 61-82% in winter, and it also significantly reduced the N2O emission by 68-84% in summer. The amounts of nitrogen uptake by the catch crop were remarkably higher than those of leached nitrogen and N2O emission in each season. Catch crop cultivation is a promising technology for mitigating diffuse agricultural pollution.
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Affiliation(s)
- K Kondo
- The United Graduate School of Agricultural Sciences, National University Corporation, Ehime University, 3-5-7 Tarumi, Matuyama 790-8566, Japan
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Nagare H, Fujiwara T, Inoue T, Akao S, Inoue K, Maeda M, Yamane S, Takaoka M, Oshita K, Sun X. Nutrient recovery from biomass cultivated as catch crop for removing accumulated fertilizer in farm soil. Water Sci Technol 2012; 66:1110-1116. [PMID: 22797242 DOI: 10.2166/wst.2012.291] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
As a result of long-term continuous use of fertilizers in farm land, a large amount of nutrients accumulate in the soil, increasing the risk of eutrophication or nitrate pollution of groundwater. For rehabilitating the farm soil and recovering nutrients such as nitrogen, phosphorus and potassium, a new system has been developed by our research group. This paper discusses the methodology of extracting nutrients from biomass in order to recover phosphorus and other nutrients in crystal form. Around 80% or higher extraction rates were achieved for phosphorus and potassium by soaking the powdered tissue in distilled water or 1% NaOH solution for 24 h. The extracted phosphorus and potassium act as a potential resource for recycled fertilizer or other industrial materials.
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Affiliation(s)
- H Nagare
- Graduate School of Environmental and Life Science, Okayama University, Tsushima-naka 3-1-1, Kita-ku, Okayama 700-8530, Japan.
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Ichikawa T, Nishiyama Y, Yamane S, Hayata S. UP-02.020 Safety and Efficacy of Holmium Laser Enucleation of the Prostate in Patients on Anticoagulant Therapy. Urology 2011. [DOI: 10.1016/j.urology.2011.07.838] [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: 10/16/2022]
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Suzuki H, Kondoh M, Li X, Takahashi A, Matsuhisa K, Matsushita K, Kakamu Y, Yamane S, Kodaka M, Isoda K, Yagi K. A toxicological evaluation of a claudin modulator, the C-terminal fragment of Clostridium perfringens enterotoxin, in mice. Pharmazie 2011; 66:543-546. [PMID: 21812332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Tight junctions (TJs) maintain cellular polarity between the apical and basolateral region of epithelial cells. Claudin, a tetra-transmembrane protein, plays a pivotal role in the barrier function of TJs. We previously found that a claudin modulator, the C-terminal fragment of Clostridium perfringens enterotoxin (C-CPE), may be a promising candidate for improving the mucosal absorption of drugs. C-CPE is a fragment of enterotoxin, and putative CPE claudin receptors are highly expressed in liver and kidney. The safety and antigenicity of C-CPE must be evaluated for future clinical application. Therefore, we evaluated whether C-CPE administration in mice leads to tissue injury or production of antibodies. Intravenous administration of C-CPE at 5 mg/kg, which is a more than 25-fold higher dose than that used in a murine mucosal absorption model, did not increase biochemical markers of liver and kidney injury even after 11 injections once a week. Nasal C-CPE administration (2 mg/kg) once a week for 11 administrations also did not increase these biochemical markers, but 6 administrations of C-CPE resulted in elevation of C-CPE-specific serum IgG. These results indicate that development of a less antigenic claudin modulator will be essential for future clinical application of a C-CPE-based mucosal absorption enhancer.
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Affiliation(s)
- H Suzuki
- Laboratory of Bio-Functional Molecular Chemistry, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
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Kawasaki Y, Harashima S, Sasaki M, Mukai E, Nakamura Y, Harada N, Toyoda K, Hamasaki A, Yamane S, Yamada C, Yamada Y, Seino Y, Inagaki N. Exendin-4 protects pancreatic beta cells from the cytotoxic effect of rapamycin by inhibiting JNK and p38 phosphorylation. Horm Metab Res 2010; 42:311-7. [PMID: 20213584 DOI: 10.1055/s-0030-1249035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
It has been reported that the immunosuppressant rapamycin decreases the viability of pancreatic beta cells. In contrast, exendin-4, an analogue of glucagon-like peptide-1, has been found to inhibit beta cell death and to increase beta cell mass. We investigated the effects of exendin-4 on the cytotoxic effect of rapamycin in beta cells. Incubation with 10 nM rapamycin induced cell death in 12 h in murine beta cell line MIN6 cells and Wistar rat islets, but not when coincubated with 10 nM exendin-4. Rapamycin was found to increase phosphorylation of c-Jun amino-terminal kinase (JNK) and p38 in 30 minutes in MIN6 cells and Wistar rat islets while exendin-4 decreased their phosphorylation. Akt and extracellular signal-regulated kinase (ERK) were not involved in the cytoprotective effect of exendin-4. These results indicate that exendin-4 may exert its protective effect against rapamycin-induced cell death in pancreatic beta cells by inhibiting JNK and p38 signaling.
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Affiliation(s)
- Y Kawasaki
- Department of Diabetes and Clinical Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Kato T, Shoji Y, Yoshio M, Yamane S, Yasuda T. Functional Soft Materials: Nanostructured Liquid Crystals and Self-Assembled Fibrous Aggregates. J SYN ORG CHEM JPN 2010. [DOI: 10.5059/yukigoseikyokaishi.68.1169] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kishimoto-Yamada K, Itioka T, Sakai S, Momose K, Nagamitsu T, Kaliang H, Meleng P, Chong L, Hamid Karim AA, Yamane S, Kato M, Reid CAM, Nakashizuka T, Inoue T. Population fluctuations of light-attracted chrysomelid beetles in relation to supra-annual environmental changes in a Bornean rainforest. Bull Entomol Res 2009; 99:217-227. [PMID: 18976509 DOI: 10.1017/s000748530800624x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In Southeast Asian tropical rainforests, two events, severe droughts associated with the El Niño-Southern Oscillation and general flowering, a type of community-wide mass flowering, occur at irregular, supra-annual intervals. The relationship between these two supra-annual events and patterns of insect population fluctuations has yet to be clearly elucidated. Leaf beetles (Chrysomelidae) are major herbivores and flower-visitors of canopy trees, affecting their growth and reproduction and, in turn, affected by tree phenology; but their population fluctuations in the Southeast Asian tropics have not been extensively investigated. We examined population fluctuation patterns of the 34 most dominant chrysomelid species in relation to the two supra-annual events by conducting monthly light-trapping over seven years in a lowland dipterocarp forest in Borneo. Our results showed large community variation in population fluctuation patterns and a supra-annual (between-year) variation in abundance for most of the dominant chrysomelids that was significantly larger than the annual (within-year) variation. Specifically, in response to a severe drought in 1998, chrysomelid species exhibited different population responses. These results show that population fluctuations of individual species, rather than the entire assemblage, must be analyzed to determine the effects of changes in environmental conditions on the structure of insect assemblages in the tropics, especially in regions where supra-annual environmental changes are relatively more important than seasonal changes.
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Affiliation(s)
- K Kishimoto-Yamada
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan.
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Yamane S, Sagara Y, Kato T. A thermoresponsive photoluminescent smectic liquid crystal: change of photoluminescent color on the smectic–smectic phase transition. Chem Commun (Camb) 2009:3597-9. [DOI: 10.1039/b902848j] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Nakamura-Kikuoka S, Takahi K, Tsuboi H, Toyosaki-Maeda T, Maeda-Tanimura M, Wakasa C, Kikuchi N, Norioka S, Iwasaki M, Matsutani T, Itoh T, Yamane S, Takemoto H, Tsuruta Y, Shimaoka Y, Yukioka M, Suzuki R, Ochi T. Limited VH gene usage in B-cell clones established with nurse-like cells from patients with rheumatoid arthritis. Rheumatology (Oxford) 2005; 45:549-57. [PMID: 16368734 DOI: 10.1093/rheumatology/kei170] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES Nurse-like stromal cells (NLC) in synovia and bone marrow of patients with rheumatoid arthritis (RA) can support pseudoemperipolesis, protect from apoptosis and enhance immunoglobulin production of peripheral blood B cells isolated from healthy individuals, suggesting the profound contribution of hyperactivation of B cells in RA. In the course of establishing RA-NLC from RA patients, we observed the growth of B cells in the presence of RA-NLC. METHODS We cloned B cells from the synovium or bone marrow of RA patients using the limiting dilution technique. For established clones, nucleotide sequences of immunoglobulin and surface antigens were investigated. To investigate the dependence of these clones on NLC, differences in the proliferation and the amount of immunoglobulin produced in the presence or absence of NLC were compared. Immunocytochemical staining of various cells was performed using the antibody these clones produced. RESULTS Nine B-cell clones established from RA patients showed RA-NLC-dependent growth. These B-cell clones expressed CD19, CD20, CD38, CD39 and CD40, suggesting that the cloned cells were mature and activated. All clones secreted immunoglobulins in culture media, which were specific for intracellular components of various cell lines, including RA-NLC. Interestingly, we found limited usage of immunoglobulin heavy-chain variable regions (VH) among B-cell clones from RA patients. These repertoires were reported to be detected preferentially in fetal livers. CONCLUSION The present study provides a novel insight into the involvement of RA-NLC in the immunopathogenesis of RA via an autoreactive B cell development and/or activation mechanism.
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Tsuboi H, Matsui Y, Hayashida K, Yamane S, Maeda-Tanimura M, Nampei A, Hashimoto J, Suzuki R, Yoshikawa H, Ochi T. Tartrate resistant acid phosphatase (TRAP) positive cells in rheumatoid synovium may induce the destruction of articular cartilage. Ann Rheum Dis 2003; 62:196-203. [PMID: 12594102 PMCID: PMC1754448 DOI: 10.1136/ard.62.3.196] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [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: 12/16/2022]
Abstract
OBJECTIVE To examine the role of tartrate resistant acid phosphatase (TRAP) positive mononuclear and multinucleated cells in the destruction of articular cartilage in patients with rheumatoid arthritis (RA). METHODS The presence of TRAP positive cells in the synovial tissue of patients with RA was examined by enzyme histochemistry and immunohistochemistry. Expression of mRNAs for matrix metalloproteinases (MMPs) was assessed by the reverse transcriptase-polymerase chain reaction (RT-PCR) and northern blot analysis. Production of MMPs by mononuclear and multinucleated TRAP positive cells was examined by immunocytochemistry, enzyme linked immunosorbent assay (ELISA) of conditioned medium, and immunohistochemistry of human RA synovial tissue. In addition, a cartilage degradation assay was performed by incubation of (35)S prelabelled cartilage discs with TRAP positive cells. RESULTS TRAP positive mononuclear cells and multinucleated cells were found in proliferating synovial tissue adjacent to the bone-cartilage interface in patients with RA. Expression of MMP-2 (gelatinase A), MMP-9 (gelatinase B), MMP-12 (macrophage metalloelastase), and MMP-14 (MT1-MMP) mRNA was detected in TRAP positive mononuclear and multinucleated cells by both RT-PCR and northern blot analysis. Immunocytochemistry for these MMPs showed that MMP-2 and MMP-9 were produced by both TRAP positive mononuclear and multinucleated cells, whereas MMP-12 and MMP-14 were produced by TRAP positive multinucleated cells. MMP-2 and MMP-9 were detected in the conditioned medium of TRAP positive mononuclear cells. TRAP positive mononuclear cells also induced the release of (35)S from prelabelled cartilage discs. CONCLUSION This study suggests that TRAP positive mononuclear and multinucleated cells located in the synovium at the cartilage-synovial interface produce MMP-2 and MMP-9, and may have an important role in articular cartilage destruction in patients with RA.
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Affiliation(s)
- H Tsuboi
- Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
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Niimi Y, Ishiguro Y, Nakata Y, Goto T, Morita S, Yamane S. Platelet adhesion to heparin coated oxygenator fibers under in vitro static conditions: impact of temperature. ASAIO J 2001; 47:361-4. [PMID: 11482487 DOI: 10.1097/00002480-200107000-00013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Heparin coating of cardiopulmonary bypass (CPB) circuitry may attenuate the platelet consumption associated with CPB. We investigated the effect of temperature on the interaction between platelet and heparin coated surfaces under in vitro static conditions. Heparin coated and non coated oxygenator fibers were incubated with heparinized whole blood at 37 degrees C and 22 degrees C. The incubation time was set at 30, 60, 180, and 300 minutes. The number of platelets adhering to each fiber was assessed with enzyme immunoassay using monoclonal antibody against platelet receptor protein CD 61(GPIIbIIIa). As an index of platelet activation, plasma soluble(s) P-selectin levels were measured by enzyme-linked immunosorbent assay. Under normothermia, the number of adherent platelets on the non coated surface increased significantly after 300 min of incubation. Platelet adhesion was reduced significantly by heparin coating of the surface and was kept constant after 300 min. Under hypothermia, heparin coating was also associated with significant reduction of platelet adhesion. The levels of sP-selectin did not correlate with the extent of platelet adhesion. Our results suggest that heparin coating is effective in decreasing platelet adhesion to the synthetic surface tested regardless of the temperature under static conditions. Inhibition of platelet activation on the heparin coated surface may be masked by standard dose heparinization.
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Affiliation(s)
- Y Niimi
- Department of Anesthesia, Teikyo University Ichihara Hospital, Chiba, Japan
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35
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Yamaguchi K, Sawada T, Yamane S, Haga S, Ikeda K, Igata-Yi R, Yoshiki K, Matsuoka M, Okabe H, Horii Y, Nawa Y, Waltrip RW, Carbone KM. Synthetic peptide-based electrochemiluminescence immunoassay for anti-Borna disease virus p40 and p24 antibodies in rat and horse serum. Ann Clin Biochem 2001; 38:348-55. [PMID: 11471876 DOI: 10.1258/0004563011900867] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [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: 11/18/2022]
Abstract
Borna disease virus (BDV) is a neurotropic pathogen that infects a wide variety of vertebrates. We have developed a new electrochemiluminescence immunoassay (ECLIA) for the detection of antibodies to BDV, using three synthetic peptides corresponding to the amino acid residues 3-20 and 338-358 of p40 and 59-79 of p24 peptide of BDV. Using the ECLIA, we examined serum samples for the presence of anti-BDV antibodies in 20 rats (experimentally BDV-infected and uninfected) and 38 horses (13 US horses, experimentally infected and uninfected, and 25 Japanese horses, feral and domestic). The ECLIA, performed in a double-blind manner, detected anti-BDV antibodies in rats with a history of BDV infection, giving results that were in agreement with indirect immunofluorescence assay and/or Western blot (WB) analysis. The ECLIA also correctly identified all three experimentally infected horses and four domestic American horses that were seropositive for BDV antibodies by WB. Among the Japanese horses, at least two out of 10 feral and six out of 15 domestic horses were seropositive for BDV. In most of these cases, the specificity of immunoreactivity was verified by blocking with soluble p40 and p24 peptides.
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Affiliation(s)
- K Yamaguchi
- Blood Transfusion Service, Kumamoto University School of Medicine, Japan.
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36
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Kanayama M, Hashimoto T, Shigenobu K, Harada M, Oha F, Ohkoshi Y, Tada H, Yamamoto K, Yamane S. Adjacent-segment morbidity after Graf ligamentoplasty compared with posterolateral lumbar fusion. J Neurosurg 2001; 95:5-10. [PMID: 11453431 DOI: 10.3171/spi.2001.95.1.0005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Of concern to spine surgeons are accelerated degenerative changes of motion segments located above and below where spinal fusion has been performed. Graf artificial ligament stabilization has been developed to avoid the adverse effect of spinal fusion. The object of this study was to assess the adjacent-segment morbidity of Graf ligamentoplasty compared with posterolateral fusion (PF) in which instrumentation was used. METHODS Data obtained in 45 patients who underwent L4-5 Graf ligamentoplasty (18 patients) or PF with instrumentation (27 patients) were reviewed retrospectively. The minimum follow-up period was 5 years. In the PF group a solid fusion rate of 92.6% was achieved. Radiographic evaluation included assessment of lumbar sagittal alignment, range of motion (ROM), and adjacent-disc degeneration. Adjacent-segment morbidity was clinically assessed by determining the reoperation rate. Graf ligamentoplasty maintained regional lordosis and flexibility (13 degrees in L4-5 lordosis; 4.4 degrees in L4-5 ROM). Although there was no difference in preoperative adjacent-disc condition between the two groups, radiographic evidence of adjacent-disc deterioration was observed more frequently in patients in the PF group than the Graf group (25% and 6% at L1-2; 38% and 6% at L2-3; 38% and 18% at L3-4; and 43% and 18% at L5-sacrum, respectively). One case in the Graf group (5.6%) and five cases in the PF group (18.5%) required additional surgeries for adjacent-segment lesions. CONCLUSIONS Graf ligamentoplasty cannot completely replace spinal fusion. In a well-selected group of patients, however, it was shown to maintain lumbar mobility and sagittal alignment, and it decreased the risk of adjacent-segment deterioration compared with PF with instrumentation.
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Affiliation(s)
- M Kanayama
- Department of Orthopaedic Surgery, Hakodate Central General Hospital, Hokkaido, Japan.
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Hashimoto T, Oha F, Shigenobu K, Kanayama M, Harada M, Ohkoshi Y, Tada H, Yamamoto K, Yamane S. Mid-term clinical results of Graf stabilization for lumbar degenerative pathologies. a minimum 2-year follow-up. Spine J 2001; 1:283-9. [PMID: 14588333 DOI: 10.1016/s1529-9430(01)00028-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Spinal fusion has some adverse effects, such as nonunion and pain at the site of grafted bone, and fusion with rigid spinal instrumentation especially may have the possibility of increasing mechanical stress on the segments adjacent to the site of fusion. The theory of the Graf system is that it will decrease adjacent disc deterioration because of maintenance of regional lordosis with flexibility and restriction of the motion of unstable segments without rigid spinal fusion. PURPOSE To assess the clinical and radiologic results of Graf stabilization for lumbar degenerative disorders with minimal or mild instability. STUDY DESIGN This is a retrospective study examining the mid-term results of Graf stabilization. PATIENT SAMPLE In total, 59 patients underwent Graf ligamentoplasty and adequate decompression from April 1993 to September 1997. The subjects were 30 men and 29 women, and the mean age at the time of surgery was 60.6 years, ranging from 23 to 82 years. The average follow-up period was 3 years and 5 months, ranging from 2 years to 5 years and 10 months. OUTCOME MEASURES We evaluated the surgical results using a scoring system, a visual analog scale, and radiological measurements. METHODS The results were assessed according to a clinical scoring system established by the Japanese Orthopaedic Association (JOA score) and ratings based on a visual analog scale. Through analysis of x-ray images, the sagittal alignment (regional lordosis) and the range of motion (ROM) of the stabilized segments were measured in all cases, and the percentage of segments slipping and posterior disc height were determined for 29 patients with degenerative spondylolisthesis. RESULTS Clinical scores and low back pain ratings based on a visual analog scale were significantly improved at the time of final follow-up compared with the preoperative values. Regional alignment of the operative segments was maintained in lordosis at the time of final follow-up. Preoperative ROM was significantly reduced at the time of final follow-up. There were no statistical differences in percentage of slippage or percentage of posterior disc height between the final follow-up values and the preoperative values. CONCLUSIONS Our clinical results indicate that the Graf system is a suitable treatment option for mild and early lumbar degenerative diseases with minimum flexion instability of less than 10 degrees.
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Affiliation(s)
- T Hashimoto
- Department of Orthopaedic Surgery, Hakodate Central General Hospital, Honcho 33-2, Hakodate City, Hokkaido 040-8585, Japan.
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Hozumi S, Yamane S. Incubation ability of the functional envelope in paper wasp nests (Hymenopteta, Vespidae, Polistes ): I. Field measurements of nest temperature using paper models. J ETHOL 2001. [DOI: 10.1007/s101640170016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Yoshida R, Yoshioka T, Yamane S, Matsutani T, Toyosaki-Maeda T, Tsuruta Y, Suzuki R. A new method for quantitative analysis of the mouse T-cell receptor V region repertoires: comparison of repertoires among strains. Immunogenetics 2000; 52:35-45. [PMID: 11132155 DOI: 10.1007/s002510000248] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
We developed an adaptor ligation PCR-based microplate hybridization assay (MHA) to analyze the repertoires of mouse T-cell receptor (TCR) alpha- and beta-chain variable regions (TCRAV and TCRBV). RNA is transcribed to cDNA and an adaptor is ligated to the 5' end of the cDNA, which is then used as a template for PCR with an adaptor-specific 3' primer and a constant region-specific 5' primer. After hybridization of PCR products with TCRAV-and TCRBV-specific probes on the microplate, quantitative ELISA was carried out. The entire TCRAV or TCRBV repertoires could be analyzed using a single 96-well plate in triplicate and completed in less than 4 h. The assay results demonstrated the high level of specificity and reproducibility of this method. Furthermore, MHA results correlated well with those of fluorescence-activated cell sorting. This method may provide important information about various T-cell-associated diseases including autoimmune disease. The influence of the MHC on mouse TCR repertoires was next studied using the newly developed mouse TCRAV and TCRBV repertoire assay. The analysis in six strains showed no significant correlation between MHC haplotypes and TCRAV and TCRBV repertoires. However, large differences among strains was observed in TCRBV, but not in TCRAV repertoires. There were also large differences within same strain in TCRBV, but not in TCRAV repertoires, indicating differences in individuals independent of genetic factors. These data suggest that TCRBV repertoires are more susceptible than TCRAV repertoires not only to genetic factors but also some environmental factors.
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MESH Headings
- Animals
- Base Sequence
- Cloning, Molecular
- DNA Probes
- DNA, Complementary
- Genetic Variation
- Mice
- Mice, Inbred AKR
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Mice, Inbred C57BL
- Mice, Inbred DBA
- Molecular Sequence Data
- Nucleic Acid Hybridization
- Receptors, Antigen, T-Cell, alpha-beta/genetics
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Affiliation(s)
- R Yoshida
- Department of Immunology, Shionogi & Co Ltd, Settsu-shi, Osaka, Japan
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Toyonaga S, Nakatsu T, Murakami T, Kusachi S, Mashima K, Tominaga Y, Yamane S, Uesugi T, Kanai H, Tsuji T. Effects of cilostazol on heart rate and its variation in patients with atrial fibrillation associated with bradycardia. J Cardiovasc Pharmacol Ther 2000; 5:183-91. [PMID: 11150407 DOI: 10.1054/jcpt.2000.8696] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
BACKGROUND Heart-rate (HR) variability is an important predictor of mortality in patients with heart disease. We examined the effects of cilostazol, a quinolinone derivative, on HR and HR variability in patients with chronic atrial fibrillation associated with bradycardia episodes. PATIENTS AND METHODS Thirteen patients with chronic atrial fibrillation associated with bradycardia episodes (minimal HR <40/min and/or pauses, ie, episodes with an RR interval > 2.5 sec) received cilostazol (100 or 200 mg/day) orally for at least 2 months and 24-hour Holter electrocardiography was performed before and after the start of cilostazol administration. RESULTS Minimal HR was significantly increased, by an average of 14 beats/min (bpm), at 3.3 +/- 0.8 weeks (mean +/- SD) after the start of cilostazol treatment. The number of pauses was significantly decreased. As a consequence, mean HR was increased by an average of 18 bpm. Maximal HR was also increased by an average of 19 bpm. The circadian variation of the HR, determined by cosine fitting, was not changed by cilostazol treatment. The time-domain HR variabilities, ie, the SD of the mean RR interval and the SD of the 5-minute mean RR intervals, were also unchanged. New York Heart Association functional class was significantly improved and the plasma atrial natriuretic polypeptide level was significantly decreased after the initiation of cilostazol treatment. CONCLUSION Cilostazol improves the slow HR episodes associated with chronic atrial fibrillation and maintains the HR circadian variation and time-domain variability, indicating that cilostazol has therapeutic utility for the treatment of the slow HR associated with chronic atrial fibrillation.
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Affiliation(s)
- S Toyonaga
- Departments of Internal Medicine I, Faculty of Medicine, and Medical Technology, Faculty of Health Sciences, Okayama University Medical School, Okayama, Japan
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Ishida H, Kaneda Y, Yamane S, Sawada T, Plautz GE, Matsumura T. Allogeneic class I major histocompatibility complex gene transfer in murine neuroblastoma in vivo. Anticancer Res 1999; 19:5367-73. [PMID: 10697563] [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: 02/15/2023]
Abstract
In vivo intratumoral gene transfer of allogeneic class I major histocompatibility complex (MHC) genes augments the immune response against weak tumor antigens. In this study, mice inoculated with the allogeneic MHC molecule (H-2Kb), had transduced-murine neuroblastoma C1300S3 cells showed prolonged survival relative to non-transduced or neo transduced tumors (p < 0.005). Interestingly, direct in vivo gene transfer of H-2Kb plasmid DNA complexed with HVJ-liposomes into S3 tumors was highly efficient, resulting in transduction of 8% of the interstitial cells within the tumor but rarely within tumor cells. Regression of established tumors and prolonged survival occurred in 50% of mice injected with H-2Kb, in contrast to no tumor regression in mice receiving control plasmid (p < 0.005). This study concludes that interstitial cells could serve as an important target of intratumoral gene transfer, and further that HVJ-liposome complexes could be a vehicle for in vivo gene transfer.
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Affiliation(s)
- H Ishida
- Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan
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Niimi Y, Ichinose F, Ishiguro Y, Terui K, Uezono S, Morita S, Yamane S. The effects of heparin coating of oxygenator fibers on platelet adhesion and protein adsorption. Anesth Analg 1999; 89:573-9. [PMID: 10475283 DOI: 10.1097/00000539-199909000-00006] [Citation(s) in RCA: 8] [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: 11/26/2022]
Abstract
UNLABELLED Platelet adhesion on the cardiopulmonary bypass oxygenator membrane is associated with impaired hemostasis. We investigated the effects of heparin coating of the oxygenator membrane on protein adsorption and platelet adhesion on the surface. Noncoated and heparin-coated polypropylene membranes were incubated in whole blood with small- (1 U/mL) or large-dose (5 U/mL) heparin as an anticoagulant for 3 h at 37 degrees C. The amount of platelets adhering on each fiber was assessed by using enzyme immunoassays using monoclonal antibodies directed against CD42b (GP Ib) and CD61 (GP IIb/IIIa). Platelet activation was assessed by measuring plasma guanosine monophosphate 140 levels. The amount and composition of the adsorbed proteins on the surface were analyzed by using a bicinchoninic acid protein assay and by using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western blotting technique. The heparin coating of the fibers significantly reduced platelet adhesion on the surface. However, platelet activation was reduced by heparin coating only with small-dose heparinization. The adsorption of platelet adhesive proteins such as fibrinogen and von Willebrand factor was not altered, whereas that of fibronectin was increased by heparin coating. We conclude that heparin coating of the oxygenator fibers can decrease platelet adhesion without affecting adsorption of major adhesive proteins. Surface heparin coating is associated with an increased fibronectin adsorption on the fibers. IMPLICATIONS Heparin coating can reduce platelet adhesion and activation in the presence of small-dose heparinization, potentially reducing the inflammatory response and activation of thrombosis and fibrinolysis.
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Affiliation(s)
- Y Niimi
- Department of Anesthesiology, Teikyo University School of Medicine, Ichihara Hospital, Chiba, Japan
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Abstract
When we see a person's face, we can easily recognize their species, individual identity and emotional state. How does the brain represent such complex information? A substantial number of neurons in the macaque temporal cortex respond to faces. However, the neuronal mechanisms underlying the processing of complex information are not yet clear. Here we recorded the activity of single neurons in the temporal cortex of macaque monkeys while presenting visual stimuli consisting of geometric shapes, and monkey and human faces with various expressions. Information theory was used to investigate how well the neuronal responses could categorize the stimuli. We found that single neurons conveyed two different scales of facial information in their firing patterns, starting at different latencies. Global information, categorizing stimuli as monkey faces, human faces or shapes, was conveyed in the earliest part of the responses. Fine information about identity or expression was conveyed later, beginning on average 51 ms after global information. We speculate that global information could be used as a 'header' to prepare destination areas for receiving more detailed information.
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Affiliation(s)
- Y Sugase
- Electrotechnical Laboratory, Umezono, Tsukuba, Japan.
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Ono K, Tsuji H, Torita S, Yamane S, Tominaga H, Masuda K, Okudaira H, Tajiri E, Kawamura T. [Invasive amebiasis at an institution for the mentally retarded in Hyogo Prefecture]. Rinsho Byori 1999; 47:669-75. [PMID: 10442047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
An outbreak of amebiasis caused by Entamoeba histolytica occurred at an institution for mentally retarded persons in Hyogo Prefecture. Twelve out of a total of 49 admitted persons exhibited E. histolytica cysts in their stool, and 13 including persons in whom no cysts had been detected showed positive serological reactions for E. histolytica infection. However, neither the cyst nor the antibody against the organism was detected in the staff members of the institution. Indirect fluorescence antibody test and sandwich enzyme-linked immunosorbent assay with a monoclonal antibody specific for pathogenic strains of E. histolytica revealed that all trophozoite strains grown from cysts in stool samples from five patients were pathogenic. Epidemiological analysis strongly suggested that a patient in the institution had been infected with an organism from a patient outside the institution, and that infection may have spread among the admitted persons due to abnormal behavior. Administration of metronidazole resulted in effective elimination of the cysts from the stool of the cyst-carriers.
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Affiliation(s)
- K Ono
- Division of Microbiology, Hyogo Prefectural Institute of Public Health, Kobe
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45
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Tomigahara Y, Onogi M, Kaneko H, Nakatsuka I, Yamane S. Metabolism of 7-fluoro-6-(3,4,5,6-tetrahydrophthalimido)-4- (2-propynyl)-2H-1,4-benzoxazin-3(4H)-one (S-53482, flumioxazin) in the rat: II. Identification of reduced metabolites. J Agric Food Chem 1999; 47:2429-2438. [PMID: 10794647 DOI: 10.1021/jf981007r] [Citation(s) in RCA: 8] [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] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
On single oral administration of (14)C-S-53482 [7-fluoro-6-(3,4,5, 6-tetrahydrophthalimido)-4-(2-propynyl)-2H-1,4-benzoxazin-3( 4H)-one, Flumioxazin] labeled at the 1- and 2-positions of tetrahydrophthaloyl group to rats at 1 (low dose) or 100 (high dose) mg/kg, the radiocarbon was almost completely eliminated within 7 days after administration in both groups with generally very low residual (14)C tissue levels. The predominant excretion route was via the feces. The major fecal and urinary metabolites involved reduction or sulfonic acid addition reactions at the 1,2-double bond of the 3,4,5,6-tetrahydrophthalimide moiety and hydroxylation of the cyclohexene or cyclohexane ring. One urinary and four fecal metabolites were identified using chromatographic techniques and spectroanalyses (NMR and MS). Three of five identified metabolites were unique forms, reduced at the 1,2-double bond of the 3,4,5, 6-tetrahydrophthalimide moiety. On the basis of the metabolites identified in this study, the metabolic pathways of S-53482 in rats are proposed. To specify tissues forming reduced metabolites, an in vitro study was conducted. Reduction was found to take place in red blood cells.
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Affiliation(s)
- Y Tomigahara
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., Kasugade-Naka, Konohana-Ku, Osaka, Japan
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Yamane S, Shirai C, Arimoto A, Komura E, Ohmisono Y, Sawada T, Matsumura T. Disseminated retinoblastoma successfully treated with myeloablative chemotherapy--implication for molecular detection of minimal residual disease. Bone Marrow Transplant 1999; 23:971-4. [PMID: 10338057 DOI: 10.1038/sj.bmt.1701740] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A useful marker for detecting minimal residual disease (MRD) has not been established yet in retinoblastoma. We assessed neuroendocrine protein gene product 9.5 (PGP9.5) expression, one of the markers for detecting MRD in neuroblastoma, in a patient with disseminated retinoblastoma. A 3-year-old boy with disseminated retinoblastoma in multiple bones and marrow was referred to our hospital. He received intensive treatment and has maintained CR for 48 months following myeloablative chemotherapy with hematopoietic stem cell transplantation (SCT). PGP9.5 expression was serially assessed by RT-PCR in peripheral blood mononuclear cells (PBMC), bone marrow cells (BMC) and mobilized peripheral blood stem cells (PBSC). Initially, his BMC consisted of 96% tumor cells which were proved to express PGP9.5 by RT-PCR. Moreover, PBMC were found to be positive for PGP9.5 indicating the presence of tumor cells in the peripheral blood. After intensive chemotherapy, PGP9.5 expression became negative in both PBMC and BMC. Prior to SCT, PBSC and BMC transplants were confirmed negative for PGP9.5 expression. It is suggested that PGP9.5 expression is a useful marker for evaluating therapeutic effects as well as detecting MRD in retinoblastoma.
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Affiliation(s)
- S Yamane
- Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan
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Nakajima N, Ishihara K, Hamada H, Yamane S, Nakamura K, Furuya T. Multi-enzymatic glucosylation using Eucalyptus UDP-glucosyltransferase coupled UDPglucose-fermentation by bakers' yeast. Biosci Biotechnol Biochem 1999; 63:934-6. [PMID: 10380636 DOI: 10.1271/bbb.63.934] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The enzymatic synthesis of glucoside compounds using a membrane-associated UDP-glucosyltransferase fraction from Eucalyptus perriniana cultured cells as a water-insoluble catalyst (N. Nakajima, et. al., J. Ferment. Bioeng., 84 (5), pp. 455-460, 1997) has been effectively done by coupling UDPglucose-fermentation by bakers' yeast. For example, beta-thujaplicin (hinokitiol) and p-aminobenzoic acid were converted respectively to their corresponding beta-D-monoglucosides with the conversion rate of around 24-26% by the multi-enzymatic system with UDPglucose as a glucose donor, which is produced by yeast cells from glucose and 5'-UMP. Addition of either cellobiose, a substrate of beta-glucosidase, or DL-1,2-anhydro-myo-inositol, an inhibitor for the enzyme in the reaction mixture, could increased the yield of these beta-D-monoglucosides. This new enzymatic system could also be used for the synthesis of flavonoid glucosides such as isoquercitrin (quercetin 3-O-beta-D-glucoside).
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Affiliation(s)
- N Nakajima
- Department of Nutritional Science, Okayama Prefectural University, Japan.
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Ohkoshi Y, Ohkoshi M, Nagasaki S, Ono A, Hashimoto T, Yamane S. The effect of cryotherapy on intraarticular temperature and postoperative care after anterior cruciate ligament reconstruction. Am J Sports Med 1999; 27:357-62. [PMID: 10352774 DOI: 10.1177/03635465990270031601] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The objective of this study was to elucidate how cryotherapy after anterior cruciate ligament reconstruction affects intraarticular temperature and clinical results. A prospective and randomized study was performed on 21 knees of 21 patients. The ligament reconstruction was performed by single-incision arthroscopy using autogenous hamstring tendon. On completion of the surgery, thermosensors were implanted in the suprapatellar pouch and the intracondylar notch, and the intraarticular temperature was monitored while the joint was cooled. Cooling was performed in one group at 5 degrees C (N = 7) and in another at 10 degrees C (N = 7), for 48 hours. A control group (N = 7) did not undergo cryotherapy. The cooled groups showed three temperature phases: a low-temperature phase immediately after the ligament reconstruction, followed by a temperature-rising phase and a thermostatic phase. The control group had no low-temperature phase and immediately entered a thermostatic phase. During the low-temperature phase in the treated groups, the temperature of the suprapatellar pouch and of the intercondylar notch were significantly lower than the body temperature. The pain score and the number of times an analgesic had to be administered were both significantly lower in the 10 degrees C group than in the control group. Blood loss was significantly less in the 5 degrees C group than in the control group.
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Affiliation(s)
- Y Ohkoshi
- Department of Orthopaedic Surgery, Hakodate Central General Hospital, Japan
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Yamane S, Motohashi K, Suzuki H, Matsugane T, Nobuto T, Azuma N, Nishide T, Suzuki M. ICAM-1 AND VCAM-1 EXPRESSION IN FAMILIAL HYPERCHOLESTEROLEMIA PATIENTS WHO UNDERWENT LONG-TERM DFPP TREATMENT. ASAIO J 1999. [DOI: 10.1097/00002480-199903000-00288] [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] Open
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Abstract
CD63 and CD62P have been recognized as platelet activation markers. This study investigated the secretion of these antigens to compare the platelet activation between a newly developed stainless steel leukocyte filter (SSLF) and 7 polyester or polyurethane commercially available leukocyte filters. Flow cytometry demonstrated that the SSLF initiated significantly smaller effects in terms of mean fluorescence intensity of CD63 (p<0.03) and of the amount of CD62P expressing platelets (p<0.002) compared to the polyurethane filters. However, there was no statistical difference between the SSLF and polyester filters. The result of this study suggests that the SSLF caused less platelet activation than the polyurethane filters and has biocompatible characteristics comparable to the currently available polyester filters. Stainless steel was selected because of its physicochemical conductivity. With these results, further evaluation of the SSLF will be continued in an attempt to develop an active immunomodulator using this unique characteristic.
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Affiliation(s)
- K Fukunaga
- Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA.
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