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Onuki S, Kawai Y, Masunaga H, Ohta N, Kikuchi R, Ashizawa M, Nabae Y, Matsumoto H. All-Perfluorosulfonated-Ionomer Composite Membranes Containing Blow-Spun Fibers: Effect of a Thin Fiber Framework on Proton Conductivity and Mechanical Properties. ACS Appl Mater Interfaces 2024; 16:10682-10691. [PMID: 38381136 PMCID: PMC10910440 DOI: 10.1021/acsami.3c17643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 01/30/2024] [Accepted: 02/05/2024] [Indexed: 02/22/2024]
Abstract
In this study, thin fiber composite polymer electrolyte membranes (PEMs) were prepared using short side-chain perfluorosulfonic acid (PFSA) ionomers, Aquivion, to create composite PEMs with improved proton conductivity and improved mechanical properties. PFSA thin fiber webs prepared by blow spinning and successive hot pressing were used as the porous substrate. Herein, PFSA ionomers were used for both the substrate and the matrix of the composite PEMs, and their structures, properties, and fuel cell performance were characterized. By adding the PFSA thin fiber webs to the matrix, the proton conductivity was enhanced and the mechanical properties were slightly improved. The prepared PFSA thin fiber composite PEM showed better FC performance than that of the pristine PFSA one for the high-temperature low-humidity condition in addition to the low-temperature high-humidity one. To the best of our knowledge, this is the first report on the all PFSA composite membranes containing a PFSA thin fiber framework.
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Affiliation(s)
- Shuta Onuki
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yoshiki Kawai
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hiroyasu Masunaga
- Japan
Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Noboru Ohta
- Japan
Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Ryohei Kikuchi
- Materials
Analysis Division, Open Facility Center, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Minoru Ashizawa
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuta Nabae
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hidetoshi Matsumoto
- Department
of Materials Science and Engineering, Tokyo
Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Yokoyama S, Kikuchi R, Matsuyama H, Ohashi K, Watarai R, Hayashi G, Numata Y, Hagiwara T, Kobayashi T, Ando Y, Matsushita T. M022 Performance evaluation of microslide and open channel on VITROS XT 7600 – Establish a clinical testing system for clinical chemistry in the event of a disaster-. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Kikuchi R, Naotake T, Maruyama S, Murohara T, Matsushita T. T287 The change for qualitative balance of vascular endothelial growth factor-a may contribute to therapeutic efficacy for an anti-neutrophil cytoplasmic antibody associated vasculitis subtypes. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.113] [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: 12/01/2022]
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Karatsu K, Kikuchi R, Kanazawa T, Nakamura A, Miyazaki H. Sphenoparietal sinus and superficial middle cerebral vein thrombosis: A case report and review of literature. Neurochirurgie 2021; 68:432-436. [PMID: 34537210 DOI: 10.1016/j.neuchi.2021.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/28/2021] [Accepted: 09/07/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND Cerebral venous sinus thrombosis is rare and might be overlooked by healthcare providers. It often occurs in the transverse sinuses, superior sagittal sinus, and the vein of Trolard. Sphenoparietal sinus (SPS) and/or superficial middle cerebral vein (SMCV) thrombosis is rare and only 12 cases reported in the literature. CASE DESCRIPTION We report a 47-year-old woman with iron deficiency anemia associated with myoma uteri who developed left SPS and SMCV thrombosis. She presented with sudden unconsciousness, right hemiplegia, and aphasia. Brain computed tomography showed subcortical hemorrhages in the left frontal and temporal lobes. Magnetic resonance imaging did not reveal the cause of the bleeding. Although antihypertensive treatment with nicardipine was initiated, she deteriorated into coma the next day and underwent emergency decompressive craniectomy. Thrombosis of the SMCV was identified during surgery. Re-examination of preoperative T2 star-weighted imaging revealed thrombosis of the SPS and SMCV. CONCLUSION All but one of the reviewed cases had the thrombosis develop on the left side, which may be attributed to anatomical and brain functional laterality. When an edematous change or cortical hemorrhage of unknown cause is encountered within the perisylvian region, especially on the left side, the possibility of SPS and SMCV thrombosis should be considered.
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Affiliation(s)
- K Karatsu
- Department of Neurosurgery, National Hospital Organization Tochigi Medical Center, 1-10-37, Nakatomatsuri, Utsunomiya, Tochigi, Japan.
| | - R Kikuchi
- Department of Neurosurgery, Hiratsuka City Hospital, 1-19-1, Minamihara, Hiratsuka, Kanagawa, Japan
| | - T Kanazawa
- Department of Neurosurgery, National Hospital Organization Tochigi Medical Center, 1-10-37, Nakatomatsuri, Utsunomiya, Tochigi, Japan
| | - A Nakamura
- Department of Neurosurgery, Hiratsuka City Hospital, 1-19-1, Minamihara, Hiratsuka, Kanagawa, Japan
| | - H Miyazaki
- Department of Neurosurgery, Hiratsuka City Hospital, 1-19-1, Minamihara, Hiratsuka, Kanagawa, Japan
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Kikuchi R, Ishiwari M, Takoi H, Kono Y, Yoshimura A, Abe S. Pulmonary intravascular lymphoma mimicking hypersensitivity pneumonitis. Pulmonology 2020; 26:409-412. [PMID: 32622735 DOI: 10.1016/j.pulmoe.2020.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Revised: 02/08/2020] [Accepted: 03/06/2020] [Indexed: 11/30/2022] Open
Affiliation(s)
- R Kikuchi
- Department of Respiratory Medicine, Tokyo Medical University Hospital, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan.
| | - M Ishiwari
- Department of Respiratory Medicine, Tokyo Medical University Hospital, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan
| | - H Takoi
- Department of Respiratory Medicine, Tokyo Medical University Hospital, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan
| | - Y Kono
- Department of Respiratory Medicine, Tokyo Medical University Hospital, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan
| | - A Yoshimura
- Department of Clinical Oncology, Tokyo Medical University Hospital, Tokyo, Japan
| | - S Abe
- Department of Respiratory Medicine, Tokyo Medical University Hospital, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo, Japan
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Kikuchi R, Sukhbaatar A, Sakamoto M, Mori S, Kodama T. A model system for studying superselective radiotherapy of lymph node metastasis in mice with swollen lymph nodes. Clin Transl Radiat Oncol 2019; 20:53-57. [PMID: 31886422 PMCID: PMC6921225 DOI: 10.1016/j.ctro.2019.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 04/24/2019] [Accepted: 05/15/2019] [Indexed: 11/25/2022] Open
Abstract
It is difficult to irradiate individual mouse lymph nodes (LNs) 1–2 mm in diameter. A maximum single dose is <8 Gy for whole-body irradiation of wild-type mice. We succeeded in applying radiation (8 Gy) to a single LN in mice with swollen LNs. Radiation-induced abscopal effects were observed in mice with swollen LNs.
Utilizing mice with swollen lymph nodes, we succeeded in irradiating individual metastatic lymph nodes through a hole in a lead shield. This system enabled us to increase the radiation dose to >8 Gy (the lethal dose for total-body irradiation) and evaluate both direct and abscopal antitumor effects.
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Affiliation(s)
- Ryohei Kikuchi
- Laboratory of Biomedical Engineering for Cancer, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Ariunbuyan Sukhbaatar
- Laboratory of Biomedical Engineering for Cancer, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, 1-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
| | - Maya Sakamoto
- Department of Oral Diagnosis, Tohoku University Hospital, 1-1 Seiryo, Aoba, Sendai, Miyagi 980-8574, Japan
| | - Shiro Mori
- Laboratory of Biomedical Engineering for Cancer, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Department of Oral and Maxillofacial Surgery, Tohoku University Hospital, 1-1 Seiryo, Aoba, Sendai, Miyagi 980-8574, Japan
| | - Tetsuya Kodama
- Laboratory of Biomedical Engineering for Cancer, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan.,Biomedical Engineering Cancer Research Center, Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo, Aoba, Sendai, Miyagi 980-8575, Japan
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Matsuoka S, Tsutsumi Y, Kikuchi R, Ito S, Teshima T. Gene Polymorphism of Tacrolimus-Metabolizing Enzymes Associated With Impaired Absorption of Tacrolimus Following Allogeneic Hematopoietic Stem Cell Transplantation: A Case Report. Transplant Proc 2019; 51:998-1001. [PMID: 30979494 DOI: 10.1016/j.transproceed.2019.01.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2018] [Revised: 12/25/2018] [Accepted: 01/17/2019] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To elucidate the mechanisms by which orally administered tacrolimus was not absorbed in a patient following allogeneic hematopoietic stem cell transplantation. CLINICAL COURSE A 17-year-old girl with acute myeloid leukemia underwent HLA-haploidentical peripheral blood stem cell transplantation following fludarabine, busulfan, and total-body irradiation. Graft-vs-host disease prophylaxis was post-transplant cyclophosphamide, followed by intravenous tacrolimus and mycophenolate mofetil. When tacrolimus was switched to oral administration, its blood level declined rapidly, resulting in development of acute graft-vs-host disease, which was ameliorated by switching back to intravenous administration. METHODS/RESULTS To elucidate if impaired tacrolimus absorption could be related to genetic polymorphism of tacrolimus-metabolizing enzymes, we analyzed gene polymorphisms of cytochrome P450 3A4, cytochrome P450 3A5, and multidrug resistance 1 (MDR1). The patient had wild-type cytochrome P450 3A4 (*1/*1) and variant-type cytochrome P450 3A5 (*3/*3), while MDR1 genes (2677A/G, 3435C/C) were wild-type. CONCLUSION Wild-type MDR1 gene product P-glycoprotein expressed in the intestine reduces drug absorption from the gastrointestinal tract and may have contributed to low blood levels of tacrolimus in this patient when tacrolimus was orally administered.
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Affiliation(s)
- S Matsuoka
- Department of Hematology, Hakodate Municipal Hospital, Hakodate, Japan.
| | - Y Tsutsumi
- Department of Hematology, Hakodate Municipal Hospital, Hakodate, Japan
| | - R Kikuchi
- Department of Hematology, Faculty of Medicine, Hokkaido University, Sapporo, Japan
| | - S Ito
- Department of Hematology, Hakodate Municipal Hospital, Hakodate, Japan
| | - T Teshima
- Department of Hematology, Faculty of Medicine, Hokkaido University, Sapporo, Japan
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Sudo Y, Kawai R, Sakai H, Kikuchi R, Nabae Y, Hayakawa T, Kakimoto MA. Star-Shaped Thermoresponsive Polymers with Various Functional Groups for Cell Sheet Engineering. Langmuir 2018; 34:653-662. [PMID: 29257892 DOI: 10.1021/acs.langmuir.7b04213] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This study demonstrates the facile preparation of poly(N-isopropylacrylamide) (PNIPAM)-immobilized Petri dishes by drop-casting a star-shaped copolymer of hyperbranched polystyrene (HBPS) possessing PNIPAM arms (HBPS-g-PNIPAM) functionalized with polar groups. HBPS was synthesized via reversible addition-fragmentation chain transfer (RAFT) self-condensing vinyl polymerization (SCVP), and HBPS polymers with different terminal structures were prepared by changing the monomer structure. HBPS-g-PNIPAM was synthesized by the grafting of PNIPAM from each terminal of HBPS. To tune the cell adhesion and detachment properties, polar functional groups such as carboxylic acid and dimethylamino groups were introduced to HBPS-g-PNIPAM. Based on surface characterization using scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS), and contact angle measurements, the advantage of the hyperbranched structure for the PNIPAM immobilization was evident in terms of the uniformity, stability, and thermoresponsiveness. Successful cell sheet harvesting was demonstrated on dishes coated with HBPS-g-PNIPAM. In addition, the cell adhesion and detachment properties could be tuned by the introduction of polar functional groups.
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Affiliation(s)
- Yu Sudo
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology , 2-12-1 S8-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryuki Kawai
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology , 2-12-1 S8-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hideaki Sakai
- Zellech Inc. , Studio3 10F, KFC-Bldg., 1-6-1, Yokoami, Sumida-ku, Tokyo 130-0015, Japan
| | - Ryohei Kikuchi
- Ookayama Materials Analysis Division, Technical Department, Tokyo Institute of Technology , 2-12-1 S7-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yuta Nabae
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology , 2-12-1 S8-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Teruaki Hayakawa
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology , 2-12-1 S8-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Masa-Aki Kakimoto
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology , 2-12-1 S8-26, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Yoshimura K, Fujii J, Yutsudo T, Kikuchi R, Soejima T, Shirahata S, Yoshida S. No Direct Effects of Shiga Toxin 1 and 2 on the Aggregation of Human Platelets In Vitro. Thromb Haemost 2017. [DOI: 10.1055/s-0037-1615248] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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10
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Kikuchi R, Kawamura M. Korbinian Brodmann's scientific profile, and academic works. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.986] [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: 11/28/2022]
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Sano M, Kikuchi R, Shinji H, Akemi T, Nagumo K. Three cases of stroke with proprioceptive dysfunction following lesions to area 3a and the medial precentral knob. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
Two new nitrile-containing diamine monomers, 4-[bis(4-aminophenyl)amino]benzonitrile and 4-[4-(1-cyanopropoxy)phenyl]2,6-bis(4-aminophenyl)pyridine were synthesized. The diamine monomers were reacted with various tetracarboxylic dianhydrides, followed by cyclodehydration (imidization) without isolation to produce a series of novel polyimides with pendant nitrile groups on the side chain. The polymers were obtained in quantitative yields with high molecular weight. Among them, polymers derived from ODPA and 6FDA showed good solubility, they could dissolve in polar solvents such as DMF, NMP, DMSO and even pyridine and m-cresol. These tough, transparent and flexible polyimide films had a tensile strength of 80–120 MPa, an elongation at break of 4–12% and a tensile modulus of 1.2–2.3 GPa. The polymers obtained exhibited high glass transition temperatures between 305 and 360 C. Moreover, they were fairly stable up to a temperature around or above 400 C and lost 10% weight in the range of 500–590 C and 470–580 C in nitrogen and air, respectively. Together the dielectric constants of the polyimides were measured to be 3.10–3.73 at 10 GHz. On the other hand, blank polyimides with no – CN groups were also prepared for comparison and the results revealed that the nitrile group affected the thermal property of polyimides as well as the electrical properties. Introduction of the –CN groups would increase the glass transition temperature and also the dielectric constant.
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Affiliation(s)
| | - Ryohei Kikuchi
- Department of Organic & Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Masa-Aki Kakimoto
- Department of Organic & Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Mitsutoshi Jikei
- Department of Material-Process Engineering Applied Chemistry for Environments, Akita University, Tegata Gakuen-machi, Akita-shi, Akita 010-8520, Japan
| | - Akio Takahashi
- Advanced Research Laboratory, Hitachi, Ltd. (MD#446)1-1, Omika-cho 7-chome, Hitachi-shi Ibaraki-ken 319-1292, Japan
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Abstract
As for selective CO methanation over heterogeneous catalysts, numerous investigations of the reaction mechanism and catalyst development are reviewed.
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Affiliation(s)
- S. Tada
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo 113–8656
- Japan
| | - R. Kikuchi
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo 113–8656
- Japan
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Itoh M, Kikuchi R, Uruma T, Tsuji T, Kuroda Y, Watanabe H, Nakamura H, Aoshiba K. All-in-one imaging of polymyositis, lung cancer and its metastatic lesions by fluorine 18 fluorodeoxyglucose positron emission tomography/computed tomography. Acta Reumatol Port 2014; 39:283-284. [PMID: 25326410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- M Itoh
- Tokyo Medical University Ibaraki Medical Center
| | - R Kikuchi
- Tokyo Medical University Ibaraki Medical Center
| | - T Uruma
- Tokyo Medical University Ibaraki Medical Center
| | - T Tsuji
- Tokyo Medical University Ibaraki Medical Center
| | - Y Kuroda
- Tokyo Medical University Ibaraki Medical Center
| | - H Watanabe
- Tokyo Medical University Ibaraki Medical Center
| | - H Nakamura
- Tokyo Medical University Ibaraki Medical Center
| | - K Aoshiba
- Tokyo Medical University Ibaraki Medical Center
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Tada S, Kikuchi R. Preparation of Ru nanoparticles on TiO2using selective deposition method and their application to selective CO methanation. Catal Sci Technol 2014. [DOI: 10.1039/c3cy00723e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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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Castro-Domínguez B, Leelachaikul P, Takagaki A, Sugawara T, Kikuchi R, Oyama S. Perfluorocarbon-based supported liquid membranes for O2/N2 separation. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.05.023] [Citation(s) in RCA: 7] [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: 10/26/2022]
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Ohsumi A, Chen F, Sakamoto J, Nakajima D, Hijiya K, Motoyama H, Okita K, Horita K, Kikuchi R, Yamada T, Sakai H, Bando T, Date H. 228 Therapeutic Effect of Surfactant Inhalation on Lungs Donated after Cardiac Death in a Canine Lung Transplantation Model. J Heart Lung Transplant 2012. [DOI: 10.1016/j.healun.2012.01.235] [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: 10/28/2022] Open
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Miyake RK, King JT, Kikuchi R, Duarte FH, Davidson JRP, Oba C. Role of injection pressure, flow and sclerosant viscosity in causing cutaneous ulceration during sclerotherapy. Phlebology 2012; 27:383-9. [PMID: 22316599 DOI: 10.1258/phleb.2011.011076] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The objective of the study is to evaluate the viscosity of popular sclerosants and their flow hydrodynamics through a syringe/needle to further discuss Miyake's old, venous-capillary reflux theory, using additional objective data. The following sclerosing agents were tested in the study: 75% dextrose (D75%); 50% dextrose (D50%); 5% ethanolamine oleate (Etha5%); 0.5% laureth-9 (Aet0.5%) and 0.1% sodium tetradecyl sulphate (STS0.1%). Using 5 mL syringes and 27G needles, the resulting pressures and flows for each sclerosant agent were measured. To do this, a three-way stopcock was connected between the syringe and the needle so that an arm of the stopcock could be used to measure injection pressures with a digital monitor in 1 mmHg increments. Two trials were performed: in trial 1, the syringe was attached to a Samtronic 680 infusion pump and in trial 2, the solutions were injected manually. The observed sclerosant viscosities were as follows: D75%: 0.28 Poise; D50%: 0.12 Poise; Etha5%: 0.10 Poise; Aet0.5%: 0.07 Poise; and STS0.1%: 0.04 Poise. In trial 1 (constant flow), it was observed that D75%, which had the highest viscosity of the sclerosants tested, had the highest pressure readings. In trial 2 (constant pressure), the flow obtained with the D75% solution was lower than the flow of the other solutions. In conclusion, based on the rabbit study theory, vessel size and sclerosant viscosity and strength, not extravasation, play a role in causing ulceration from injection sclerotherapy. As a result, they all affect the potential of venous-capillary reflux being caused by sclerotherapy injection and, thus, the risk of postsclerotherapeutic cutaneous ulceration.
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Kikuchi Y, Takano M, Goto T, Kouta H, Kikuchi R, Kudoh K, Kita T, Furuya K, Umayahara K, Takizawa K. Effects of weekly bevacizumab and paclitaxel/carboplatin with or without sorafenib on heavily pretreated patients with recurrent or persistent cervical cancer. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kouta H, Kudoh K, Takano M, Kikuchi R, Kita T, Goto T, Furuya K, Kikuchi Y. The role of bevacizumab in combination with pegylated liposomal doxorubicin in patients with platinum-resistant recurrent or refractory ovarian cancers. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Kikuchi Y, Kudoh K, Takano M, Kikuchi R, Kita T, Hamada Y, Nagao S, Fujiwara K, Shiozawa T, Aoki D. Effects of treatment by temsirolimus on patients with clear cell carcinoma of the ovary. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.5086] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Maeda R, Hayakawa T, Tokita M, Kikuchi R, Kouki J, Kakimoto MA, Urushibata H. Double liquid crystalline side-chain type block copolymers for hierarchically ordered nanostructures: Synthesis and morphologies in the bulk and thin film. REACT FUNCT POLYM 2009. [DOI: 10.1016/j.reactfunctpolym.2009.03.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kikuchi Y, Kouta H, Kikuchi R, Takano M, Kita T, Kudoh K, Aoki D, Sugiyama T, Isonishi S. Effects of weekly bevacizumab and pegylated liposomal doxorubicin in heavily pretreated patients with recurrent or progressed ovarian cancer. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.5547] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
5547 Background: Vascular endothelial growth factor (VEGF) plays a central role in tumor angiogenesis and is regarded a promising therapeutic target. Bevacizumab (A) has significant antitumor activity in combination with cytotoxic agents. Currently, pegylated liposomal doxorubicin (D) is provided as one of the standard treatment options in recurrent ovarian cancer. Thus, we attempted to determine effects in combination of A and D for heavily pretreated patients with recurrent or progressed ovarian cancer. Methods: Twenty-two patients with heavily pretreated (more than one regimen or more than 6 cycles by paclitaxerl and carboplatin) received at least more than 3 cycles of weekly A-D consisting of A: 2 mg/kg and D: 10 mg/m2 (3 weeks, one week rest). The primary endpoint was response according to CA 125 and response evaluation criteria in solid tumor (RECIST) criteria. Results: Of 22 patients evaluable for CA 125 response, 7 (32%) had a response (decrease of >50%), and 8 (36%) patients had not progressed (doubling of CA 125) following 6 months on treatment. In RECIST evaluation, 2 (9%) patients had complete remission (CR) and 6 (27%) had partial remission (PR), resulting in 55% clinical benefit rate (CBR). Progression free interval (PFI) showed more than 6 months. Any hematological adverse effect was not observed in the present study. Gastrointestinal perforation was observed in only one case and was conservatively treated. Although nasal bleeding was frequently observed, no treatment was required. A induced hypertension was also observed and manageable. Hand-foot syndrome seemed due to D was seen in 3 of 22 patients and treatment was required in only one case. Conclusions: B seemed to enhance effect of D. This is the first study of weekly A-D in heavily pretreated ovarian cancer patients. Weekly A-D warrants further clinical study in such clinical settings. No significant financial relationships to disclose.
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Affiliation(s)
- Y. Kikuchi
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - H. Kouta
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - R. Kikuchi
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - M. Takano
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - T. Kita
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - K. Kudoh
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - D. Aoki
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - T. Sugiyama
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
| | - S. Isonishi
- Ohki Memorial Kikuchi Cancer Clinic for Women, Tokorozawa, Japan; National Defense Medical College, Tokorozawa, Japan; Teikyou University School of Medicine, Tokyo, Japan; Nishisaitama Central Hospital, Tokorozawa, Japan; Keio University School of Medicine, Tokyo, Japan; Iwate Medical University, Morioka, Japan; Jikei University School of Medicine, Tokyo, Japan
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Kikuchi R, Amaral PBD. Conceptual schematic for capture of biomethane released from hydroelectric power facilities. Bioresour Technol 2008; 99:5967-5971. [PMID: 18053710 DOI: 10.1016/j.biortech.2007.10.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Revised: 10/12/2007] [Accepted: 10/17/2007] [Indexed: 05/25/2023]
Abstract
Though dam-related biomethane was identified in the 1960s, its capture has not been sufficiently discussed. Captured biomethane could be burned to produce energy, and the burning of biomethane turns the carbon in it into CO(2) that is far less potent as a greenhouse gas; this paper therefore aims to technically discuss the capture/use of dam-related biomethane. A great amount of bubbles would be formed by the rapid drop in water pressure (i.e. cavitation) after turbine passage, so it is proposed to capture methane-bearing bubbles by means of a flow tube for adjusting residence time and hydrophilic screens for trapping these bubbles. The results from the performed calculation show that biomethane can be trapped in a yield of 60%.
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Affiliation(s)
- R Kikuchi
- Departamento de Ciências Exactas e do Ambiente (CERNAS), ESAC - Instituto Politécnico de Coimbra, Bencanta, 3040-316 Coimbra, Portugal.
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25
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Yamada Y, Hirai T, Kikuchi R, Hayakawa T, Kakimoto MA. Adsorption of Hyperbranched Polysiloxysilane Modified with Triethoxy Group onto the Silicon Wafer. HIGH PERFORM POLYM 2008. [DOI: 10.1177/0954008307081213] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Triethoxysilyl functionalized hyperbranched polsiloxysilanes at the focal (FT-HBPSs) and terminal (TT-HBPSs) positions were synthesized to investigate adsorption behavior onto a silicon wafer surface. The surface of the silicon wafer adsorbed with the HBPSs was characterized by X-ray photoelectron spectroscopy, atomic force microscopy (AFM), static and dynamic water contact angle measurements. The AFM images indicated the formation size of dot-like structures were approximately 200 nm. The presence of vinyl terminal groups of FT-HBPSs permitted conversion of the surface from a non-polar hydrocarbon to a polar hydroxylated or carboxylated structures. After the polarity was changed, the surface properties were also studied using the above surface analysis techniques. The dynamic contact angle measurement indicated that the silicon wafer surface modified by FT-HBPSs was more hydrophilic in water than TT-HBPS. This behavior can be explained by the difference of connecting points between HBPS and the silicon wafer surface.
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Affiliation(s)
- Yasuko Yamada
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Tomoyasu Hirai
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryohei Kikuchi
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Teruaki Hayakawa
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Masa-Aki Kakimoto
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-26, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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26
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Wu S, Hayakawa T, Kikuchi R, Grunzinger SJ, Kakimoto MA, Oikawa H. Synthesis and Characterization of Semiaromatic Polyimides Containing POSS in Main Chain Derived from Double-Decker-Shaped Silsesquioxane. Macromolecules 2007. [DOI: 10.1021/ma070547z] [Citation(s) in RCA: 178] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shouming Wu
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Teruaki Hayakawa
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryohei Kikuchi
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Stephen J. Grunzinger
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Masa-aki Kakimoto
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8552, Japan
| | - Hisao Oikawa
- Goi Research Center, Chisso Petrochemical Corporation, 5-1 Goi-Kaigan, Ichihara, Chiba 290-8551, Japan
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27
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Okazaki K, Sakamoto K, Kikuchi R, Saito A, Togashi E, Kuginuki Y, Matsumoto S, Hirai M. Mapping and characterization of FLC homologs and QTL analysis of flowering time in Brassica oleracea. Theor Appl Genet 2007; 114:595-608. [PMID: 17136371 DOI: 10.1007/s00122-006-0460-6] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Accepted: 11/06/2006] [Indexed: 05/12/2023]
Abstract
The FLC gene product is an inhibitor of flowering in Arabidopsis. FLC homologs in Brassica species are thought to control vernalization. We cloned four FLC homologs (BoFLCs) from Brassica oleracea. Three of these, BoFLC1, BoFLC3 and BoFLC5, have been previously characterized. The fourth novel sequence displayed 98% sequence homology to the previously identified gene BoFLC4, but also showed 91% homology to BrFLC2 from Brassica rapa. Phylogenetic analysis showed that this clone belongs to the FLC2 clade. Therefore, we designated this gene BoFLC2. Based on the segregation of RFLP, SRAP, CAPS, SSR and AFLP loci, a detailed linkage map of B. oleracea was constructed in the F(2) progeny obtained from a cross of B. oleracea cv. Green Comet (broccoli; non-vernalization type) and B. oleracea cv. Reiho (cabbage; vernalization type), which covered 540 cM, 9 major linkage groups. Six quantitative trait loci (QTL) controlling flowering time were detected. BoFLC1, BoFLC3 and BoFLC5 were not linked to the QTLs controlling flowering time. However, the largest QTL effect was located in the region where BoFLC2 was mapped. Genotyping of F(2 )plants at the BoFLC2 locus showed that most of the early flowering plants were homozygotes of BoFLC-GC, whereas most of the late- and non-flowering plants were homozygotes of BoFLC-Rei. The BoFLC2 homologs present in plants of the non-vernalization type were non-functional, due to a frameshift in exon 4. Moreover, duplications and deletions of BoFLC2 were detected in broccoli and a rapid cycling line, respectively. These results suggest that BoFLC2 contributes to the control of flowering time in B. oleracea.
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Affiliation(s)
- K Okazaki
- Faculty of Agriculture, Niigata University, Niigata 950-2181, Japan.
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28
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Isowa N, Kikuchi R, Kosaba S. [Diaphragmatic hernia by blunt trauma]. Kyobu Geka 2006; 59:1023-6. [PMID: 17058666] [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: 05/12/2023]
Abstract
Two cases of diaphragmatic hernia by blunt trauma were experienced. One patient was a 21-year-old man who had been injured in a car collision 4 days before was transferred to our division from another hospital. Another patient was a 66-year-old man who was admitted in an emergency after a fall from a height. Both patients were suspected from chest X-ray and computed tomography (CT) to have traumatic rupture of left diaphragm, and were successfully performed repair of the diaphragm by thoracic approach. Since the diagnosis of ruptured diaphragm is frequently missed in the acute phase, a careful scrutiny of the chest X-ray is required. Laparotomy is the operative approach of choice in the case with the associated abdominal injuries. On the other hand, thoracotomy is selected for the patients accompanied with the lung injury or in the latent phase. Although diaphragmatic rupture can be managed by the appropriate treatment, the associated injuries or complications are responsible for the high mortality.
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Affiliation(s)
- Noritaka Isowa
- Division of Thoracic Surgery, Matsue Red Cross Hospital, Matsue, Japan
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29
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Kikuchi R, Murakami M, Sobue S, Iwasaki T, Hagiwara K, Takagi A, Kojima T, Asano H, Suzuki M, Banno Y, Nozawa Y, Murate T. Ewing's sarcoma fusion protein, EWS/Fli-1 and Fli-1 protein induce PLD2 but not PLD1 gene expression by binding to an ETS domain of 5' promoter. Oncogene 2006; 26:1802-10. [PMID: 16964281 DOI: 10.1038/sj.onc.1209973] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [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: 11/09/2022]
Abstract
It was reported that short interfering RNA (siRNA) of EWS/Fli-1 downregulated phospholipase D (PLD)2 in Ewing's sarcoma (EWS) cell line, suggesting that PLD2 is the target of aberrant transcription factor, EWS/Fli-1. Here, we further investigated the regulation of PLD2 gene expression by EWS/Fli-1 and Fli-1 in another EWS cell line, and also in EWS/Fli-1- or Fli-1-transfected cell line. EWS/Fli-1- or Fli-1-overexpressed cells showed higher PLD2 but not PLD1 protein expression and enhanced cell proliferation as compared to mock transfectant. The treatment of these cells with 1-butanol or siRNA of PLD2 inhibited cell growth, suggesting the pivotal role of PLD in cell growth promotion. PLD2 but not PLD1 mRNA level was also increased in EWS/Fli-1 or Fli-1-transfectants. After determining the transcription initiation points, we cloned the 5' promoter of both PLD1 and PLD2 and analysed promoter activities. Results showed that EWS/Fli-1 and Fli-1 increase PLD2 gene expression by binding to an erythroblast transformation-specific domain (-126 to -120 bp from the transcription initiation site) of PLD2 promoter, which is the minimal and most powerful region. Electrophoresis mobility shift assay using truncated proteins showed that both DNA-binding domain and trans-activating domain were necessary for the enhanced gene expression of PLD2.
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Affiliation(s)
- R Kikuchi
- Nagoya University Graduate School of Medicine, Nagoya University School of Health Sciences, Nagoya, Aichi, Japan
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30
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Sobue S, Iwasaki T, Sugisaki C, Nagata K, Kikuchi R, Murakami M, Takagi A, Kojima T, Banno Y, Akao Y, Nozawa Y, Kannagi R, Suzuki M, Abe A, Naoe T, Murate T. Quantitative RT-PCR analysis of sphingolipid metabolic enzymes in acute leukemia and myelodysplastic syndromes. Leukemia 2006; 20:2042-6. [PMID: 16990773 DOI: 10.1038/sj.leu.2404386] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Hoshikawa T, Ikebe T, Kikuchi R, Eguchi K. Effects of electrolyte in dye-sensitized solar cells and evaluation by impedance spectroscopy. Electrochim Acta 2006. [DOI: 10.1016/j.electacta.2006.01.053] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Hayakawa T, Seino M, Goseki R, Hirai T, Kikuchi R, Kakimoto MA, Tokita M, Yokoyama H, Horiuchi S. Fabrication of Hierarchically Ordered Hybrid Structures over Multiple Length Scales via Direct Etching of Self-Organized Polyhedral Oligomeric Silsesquioxane (POSS) Functionalized Block Copolymer Films. Polym J 2006. [DOI: 10.1295/polymj.pj2005140] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Seino M, Yokomachi K, Hayakawa T, Kikuchi R, Kakimoto MA, Horiuchi S. Preparation of poly(N-isopropylacrylamide) grafted silica bead using hyperbranched polysiloxysilane as polymer brush and application to temperature-responsive HPLC. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.01.027] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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Moriyama H, Kawahara K, Noguchi T, Kikuchi R, Wada S, Takeno S, Kashima K. Primary extramedullary plasmacytoma of the small intestine. A case report and review of the literature. J Exp Clin Cancer Res 2006; 25:129-34. [PMID: 16761629] [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: 05/10/2023]
Abstract
A case of primary extramedullary plasmacytoma of the small intestine in a 73-year-old Japanese woman was reported. The patient underwent local resection of the tumor, and showed no signs of local recurrence or dissemination of the disease after 28 months follow-up. The tumor cells had relatively large nuclei with distinct nucleoli and wide and slightly basophilic cytoplasm with a high N/C ratio which showed the morphology of atypical plasma cells. Immunohistochemical examination revealed that the tumor cells contained IgG gamma-type immunoglobulin in their cytoplasm but they did not contain IgA, IgM, IgD, and kappa-light chains. The tumor cells were also positive for CD79a and CD138 and negative for LCA, CD20 and CD45RO. These findings clearly indicated this case to be plasmacytoma.
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Affiliation(s)
- H Moriyama
- Department of Oncological Science (Surgery II), Faculty of Medicine, The University of Oita, Oita, Japan.
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35
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Takahashi A, Kakimoto MA, Tsurumi TA, Hao J, Li L, Kikuchi R, Miwa T, Ohno T, Yamada S, Takezawa Y. Polymer-Ceramic Nanocomposites Based on New Concepts for Embedded Capacitor. ACTA ACUST UNITED AC 2006. [DOI: 10.1541/ieejfms.126.1160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
| | | | | | | | - Li Li
- Tokyo Instetute of Technology
| | | | - Takao Miwa
- Hitachi., Ltd., Hitachi Research Laboratory
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36
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Li Li, Takahashi A, Jianjun Hao, Kikuchi R, Hayakawa T, Tsurumi TA, Kakimoto MA. Novel polymer-ceramic nanocomposite based on new concepts for embedded capacitor application (I). ACTA ACUST UNITED AC 2005. [DOI: 10.1109/tcapt.2005.859740] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [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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37
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Matsui T, Kukino T, Kikuchi R, Eguchi K. An Intermediate Temperature Proton-Conducting Electrolyte Based on a CsH2PO4 / SiP2O7 Composite. ACTA ACUST UNITED AC 2005. [DOI: 10.1149/1.1883906] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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38
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Ito S, Isowa N, Kikuchi R, Hasegawa S, Inui K, Wada H. [Mediastinal seminoma difficult to differentiate from thymoma through preoperative biopsy; report of a case]. Kyobu Geka 2004; 57:1070-3. [PMID: 15510825] [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: 05/01/2023]
Abstract
A case of a 36-year-old male patient with mediastinal seminoma is presented. He consulted a physician with a complaint of back pain and an abnormal shadow was detected on chest X-ray. Chest computed tomography (CT) scan revealed a pulmonary nodule and an anteriormediastinal mass. Preoperative percutaneous needle biopsy suggested that the tumor was similar to thymoma. Complete surgical excision of the mediastinal mass was performed. Immunohistochemical studies showed positive staining of the tumor cells with placental alkaline phosphatase. The final diagnosis was seminoma. Additional postoperative chemotherapy (cisplatin + etoposide) was done. He is alive and well 34 months after the operation.
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Affiliation(s)
- Shinya Ito
- Department of Thoracic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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39
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Hong CS, Jikei M, Kikuchi R, Kakimoto MA. Chemically Amplified Photosensitive Polybenzoxazoles Based ontert-Butoxycarbonyl Protected Hyperbranched Poly(o-hydroxyamide)s. Macromolecules 2003. [DOI: 10.1021/ma021692+] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Kikuchi R, Noguchi T, Takeno S, Funada Y, Moriyama H, Uchida Y. Nuclear BAG-1 expression reflects malignant potential in colorectal carcinomas. Br J Cancer 2002; 87:1136-9. [PMID: 12402153 PMCID: PMC2376197 DOI: 10.1038/sj.bjc.6600579] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2002] [Revised: 07/29/2002] [Accepted: 08/15/2002] [Indexed: 12/13/2022] Open
Abstract
BAG-1 is a recently identified Bcl-2-interacting anti-apoptotic protein. The aim of our study was to investigate the immunohistochemical staining pattern of BAG-1 protein in patients with colorectal cancer and examine associations of BAG-1 expression with various clinicopathological factors and patient survival. Tumour samples were collected from 86 patients diagnosed with colorectal cancer. There was significant variation in the immunohistochemical staining patterns for BAG-1, including absent staining and staining of either the cytoplasm, nucleus or both. Twenty-one colorectal carcinomas (24.4%) exhibited a nuclear staining pattern whilst 56 (65.1%) exhibited cytoplasmic staining. The percentage of cases exhibiting nuclear BAG-1 positivity was significantly higher in distant metastasis-positive cases (55.6%) than in distant metastasis-negative cases (20.8%; P=0.036). Overall survival was significantly shorter for patients with tumours exhibiting BAG-1 positive nuclei than those with absent nuclear BAG-1-staining (P=0.011). In addition, the multivariate cox proportional hazard models indicated that nuclear BAG-1 expression was the only independent prognostic variable for mortality (P=0.013). These studies demonstrate that nuclear BAG-1 expression is a useful predictive factor for distant metastasis and a poor prognosis in patients with colorectal cancer.
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Affiliation(s)
- R Kikuchi
- Department of Surgery II, Oita Medical University, 1-1 Idaigaoka, Hasama-machi, Oita 879-5593, Japan.
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Takeno S, Noguchi T, Takahashi Y, Kikuchi R, Uchida Y, Yokoyama S. Immunohistochemical and clinicopathologic analysis of response to neoadjuvant therapy for esophageal squamous cell carcinoma. Dis Esophagus 2002; 14:149-54. [PMID: 11553227 DOI: 10.1046/j.1442-2050.2001.00174.x] [Citation(s) in RCA: 10] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Recently, neoadjuvant chemotherapy combined with radiation (NAT) has been used in the active treatment of progressive esophageal cancer (T4). However, many patients are resistant to supplemental therapy, and it is necessary to to be aware that side-effects may occur. Accordingly, to minimize adverse reactions and cost, it is important to determine the indications for NAT. We investigated 34 patients with T4 esophageal squamous cell carcinoma and examined the relation between the effects of NAT and immunohistochemical or additional clinicopathologic factors. There was no relation between clinicopathologic factors and immunohistochemical findings (p53 or hsp27 expression), and no clinicopathologic factors showed a relation to a supplemental therapeutic effect. In addition, there was no correlation between p53 staining and therapeutic effects (P=0.734). In contrast, there was a correlation (P=0.0058) between hsp27 staining and therapeutic effect. In conclusion, the usefulness of hsp27 immunostaining in predicting the therapeutic effect of NAT was confirmed in T4 esophageal squamous cell carcinoma.
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Affiliation(s)
- S Takeno
- Department of Surgery II, Oita Medical University, Oita, Japan.
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Takeno S, Noguchi T, Kikuchi R, Sato T, Uchida Y, Yokoyama S. Analysis of early (pT1) gastric cancer with submucosal invasion: surgical management and possibility to schedule less invasive surgery. Ann Surg Oncol 2001; 8:605-10. [PMID: 11508623 DOI: 10.1007/s10434-001-0605-4] [Citation(s) in RCA: 12] [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]
Abstract
BACKGROUND Early gastric cancer (EGC) is one of the popular targets of less invasive surgery. The aim of the present study is to clarify the possibility of scheduling a less invasive surgery for EGC cases with submucosal (SM) invasion. METHODS Eighty cases of EGC with SM invasion were analyzed clinicopathologically and immunohistochemically. Correlations between factors that reflect cancer progression and data from endoscopic examination were investigated. RESULTS Thirteen cases (16.3%) showed lymph node metastasis and the numbers of metastasis-positive lymph nodes ranged from 1 to 18. Two cases showed lymph node metastasis not only in the perigastric area, but also along the left gastric artery and the common hepatic artery. Only the tumor size showed a significant correlation with lymph node metastasis (P = .014) using the data from preoperative endoscopic examination. With respect to p53 overexpression, there was no significant correlation with pathologic factors in EGC with SM invasion. The simple protuberance types that were <2 cm in diameter had no lymph node metastasis. CONCLUSIONS It seems difficult to predict the progression of EGC with SM invasion from the data currently obtained by preoperative endoscopic examination. It was suggested that less invasive surgery could be scheduled only for simple protuberance type cases that were <2 cm in diameter. Radical gastrectomy and D2 lymph node dissection is required, in open surgery or laparoscopic surgery, for any other type of EGC with SM invasion.
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Affiliation(s)
- S Takeno
- Department of Surgery II, Oita Medical University, Japan.
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Abstract
The major contributors to global acidification are sulfur oxides and nitrogen oxides emitted mostly by the burning of fossil fuels. From the scientific point of view, it is necessary to make a clear distinction between sulfur dioxide and sulfur trioxide when referring to sulfur oxides. These two air pollutants have different properties. This paper reports the following aspects: the strong effect of sulfur trioxide on local human health (a case study of asthma in Yokkaichi), the problem of corrosion caused by sulfur trioxide, the difference in analytical methods for determining sulfur dioxide concentrations and sulfur trioxide concentrations, and the difference in removal methods for sulfur dioxide and sulfur trioxide. An important initiative at the third European conference of environment ministers was that the issue of human health related to local air pollution should be given priority over that of global pollution. The declines in the emissions of sulfur dioxide and nitrogen oxides have mainly been effective in reducing acidification due to long-range transport. The reduction in sulfur trioxide may be more effective in improving local human health mentioned in the initiative.
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Affiliation(s)
- R Kikuchi
- Department of Basic Science and Environment, Escola Superior Agraria de Coimbra, Polytechnic Institute of Coimbra, Portugal
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Takeno S, Noguchi T, Kikuchi R, Wada S, Sato T, Uchida Y. Immunohistochemical study of leukocyte infiltration and expression of hsp70 in esophageal squamous cell carcinoma. Oncol Rep 2001; 8:585-90. [PMID: 11295085 DOI: 10.3892/or.8.3.585] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
It is reported that macrophages and CD4+ or CD8+ cytotoxic T cells have an important role in the suppression of cancer progression. The aim of this study was to clarify these immune responses in patients with esophageal cancer. We enrolled 28 patients with pT2 esophageal cancer that had been resected without preoperative adjuvant therapy. The correlations between the numbers of infiltrating CD4+, CD8+ and CD68+ cells, the expression of heat shock protein 70 (hsp70) and a variety of clinicopathologic factors were analyzed. The numbers of CD8+ T cells and CD68+ macrophages showed a significant positive correlation with tumor diameter (p = 0.01, p = 0.037) and the expression of hsp70 (p = 0.01, p = 0.02) and a negative correlation with lymph node metastasis (p = 0.0079, p < 0.0001). The expression of hsp70 exhibited a negative correlation with lymph node metastasis (p = 0.023). CD8+ T cells and CD68+ macrophages might have a suppressive function against esophageal cancer progression. Our results suggested that hsp70 might play an important role in the presentation of tumor specific antigens.
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Affiliation(s)
- S Takeno
- Department of Surgery II, Oita Medical University, Hasama-machi, Oita 879-5593, Japan.
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Abstract
BACKGROUND Patients with stage IV gastric cancer usually have a poor prognosis, but some patients with resectable cancer survive for more than 5 years. We aimed to study the correlation of protein expression and survival in resectable stage IV gastric cancer. PATIENTS AND METHODS Tissue samples of 42 patients with resectable stage IV gastric cancer were stained immunohistochemically for the mutant p53 protein and heat shock protein-27 (hsp27). The correlation between protein expression and clinicopathological factors was investigated. Furthermore, prognostic value of each factor was analyzed. RESULTS Univariate analysis showed that pN factors (Japanese classification, P = .028; International Union Against Cancer classification, P = .024), blood vessel invasion (P = .043), hsp27 overexpression (P = .019), and the index of p53 and hsp27 overexpression (P = .0026) had a prognostic influence. Only Lauren classification, however, revealed the prognostic influence in multivariate analysis (P = .046). CONCLUSIONS These results suggest that immunostaining of tumor specimens for p53 and hsp27 and clinicopathological analysis may help predict the survival of patients with resectable stage IV gastric cancer.
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Affiliation(s)
- S Takeno
- Department of Surgery II, Oita Medical University, Japan
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Adzuhata T, Inotsume J, Okamura T, Kikuchi R, Ozeki T, Kajikawa M, Ogawa N. Evaluation of ionic pollutants of acid fog and rain using a factor analysis and back trajectories. ANAL SCI 2001; 17:71-6. [PMID: 11993680 DOI: 10.2116/analsci.17.71] [Citation(s) in RCA: 17] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Fog and rain water samples were collected at the same time in the Akita Hachimantai mountain range in northern Japan from June to September in 1998 and 1999. The various ion concentrations in these samples were analyzed, and the fog droplet sizes were measured for each fog event. As the fog droplet size increased, the ion concentration decreased. The slope of log-log plots of the concentration versus the droplet size differed with the kind of ion. In order to characterize the air pollutant, moreover, these data were quantitatively analyzed by an oblique rotational factor analysis. We found that three factors were extracted as the air pollutant source: (NH4)2SO4, acids (HNO3 + H2SO4) and sea-salt. Combining the factor analysis with the 72 h back-trajectory at 850 hPa level, we found that the contribution of each factor varied with the transport pattern of air masses.
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Affiliation(s)
- T Adzuhata
- Faculty of Engineering and Resource Science, Akita University, Japan.
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Abstract
PURPOSE We evaluated the usefulness of magnetic resonance imaging for the preoperative diagnosis of deep anorectal abscesses. METHODS Subjects were 21 patients with deep anorectal abscesses. Deep anorectal abscesses were classified into two types, ischiorectal and pelvirectal, according to their location. Patients were also classified into a single abscess group, which showed either an ischiorectal or pelvirectal abscess, and a double abscess group, which showed both ischiorectal and pelvirectal abscesses. The final diagnosis was made from surgical findings, and the types of deep anorectal abscesses determined by digital examination and magnetic resonance imaging were compared. RESULTS Sensitivity of ischiorectal abscesses (20 lesions) with digital examination and magnetic resonance imaging was 75 and 95 percent, respectively, and that of pelvirectal abscesses (10 lesions) with digital examination and magnetic resonance imaging was 60 and 70 percent, respectively. Sensitivity of the magnetic resonance imaging was significantly higher than that of digital examination in ischiorectal abscesses. Diagnostic accuracy of digital examination and magnetic resonance imaging were both 83 percent in the single abscess group (12 patients), whereas in the double abscess group (9 patients) it was 22 and 78 percent, respectively. The rate of accurate diagnosis of magnetic resonance imaging compared with digital examination in the double abscess group was significantly higher than that in the single abscess group. CONCLUSION Magnetic resonance imaging was useful for diagnosing and differentiating ischiorectal and pelvirectal abscesses.
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Affiliation(s)
- R Maruyama
- Coloproctology Center, Takano Hospital, Kumamoto, Japan
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Chaki O, Yoshikata I, Kikuchi R, Nakayama M, Uchiyama Y, Hirahara F, Gorai I. The predictive value of biochemical markers of bone turnover for bone mineral density in postmenopausal Japanese women. J Bone Miner Res 2000; 15:1537-44. [PMID: 10934652 DOI: 10.1359/jbmr.2000.15.8.1537] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.1] [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: 11/18/2022]
Abstract
To examine the predictive value of biochemical markers of bone turnover for bone loss pre- and postmenopausally, we measured two markers of bone formation, bone-specific alkaline phosphatase (BALP) and intact osteocalcin (OC); four markers of bone resorption, urinary cross-linked N-telopeptides of type I collagen (NTx), type I collagen C-telopeptide breakdown products (CTx), hydroxylysylpyridinoline (HP) and lysylpyridinoline (LP); serum OC N-terminal (OC-N); and two serum cytokines, soluble interleukin-6 receptor (sIL-6R) and IL-1r antagonist at baseline and 1 year, as well as lumbar spine bone mineral density (BMD) at baseline and 1, 2, 3, 4, and 5 years after trial in 82 premenopausal (44.8 +/- 5.4 years old) and 325 postmenopausal (60.2 +/- 6.1 years old) healthy Japanese women. In premenopausal women, stratification of the baseline value of each biochemical marker into quartiles did not cause any significant difference in the change in BMD. Stratification of the NTx baseline value in postmenopausal women showed significant differences in rate of bone loss to the first year among those subjects with each quartile (Q1 [0.28 +/- 0.28%], Q2 [-0.32 +/- 0.34%], Q3 [-1.50 +/- 0.31%], and Q4 [-2.43 +/- 0.35%]) except for the difference between Q1 and Q2. The predictive value of NTx for BMD was greater in early postmenopausal women within 5 years after menopause than in late postmenopausal women with more than 5 years since menopause (YSM). Quartile analysis of the other biochemical markers and serum cytokines did not show any significant capacity for differentiating between bone loss rates. Moreover, when the changes in the lumbar spine BMD to the second and third years were stratified into quartiles by the baseline NTx, the ratios of bone loss to the second and the third years were significantly higher in those women with higher NTx (Q4; -3.15 +/- 0.56% and -4.06 +/- 0.57%, respectively) than in those with lower NTx (Q1; -0.74 +/- 0.44% and -1.03 +/- 0.51%, respectively). In conclusion, baseline urinary NTx was the most sensitive predictor of bone loss in the lumbar spine after 1, 2, and 3 years. Markers of bone resorption can be used clinically to predict future BMD in postmenopausal women.
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Affiliation(s)
- O Chaki
- Department of Obstetrics and Gynecology, Yokohama City University School of Medicine, Japan
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Abstract
We investigated whether the expression of membrane-type-1 matrix metalloproteinase (MT1-MMP), matrix metalloproteinase-2 (MMP-2) and tissue inhibitor of metalloproteinase-2 (TIMP-2) was consistent with the proposed roles of these proteins in promoting metastasis in colorectal cancer. The expression of MT1-MMP was significantly more frequent in deeply invasive carcinomas (P = 0.007) and in cases of vascular invasion (P = 0.02). The frequency of detection of MMP-2 in the stroma was much greater in vascular invasion-positive cases (42%) than in negative cases (20%; P = 0.02). The rate of detection of TIMP-2 in tumour cell cytoplasm increased with the depth of invasion (P = 0.03). TIMP-2 in the stroma was found more frequently in tumours with lymphatic invasion and lymph node metastasis (P < 0.05). Significant correlations were found between detection of MT1-MMP and MMP-2 in tumour cell cytoplasm (P < 0.05), of MT1-MMP and TIMP-2 in tumour cell cytoplasm (P < 0.01), and of MMP-2 and TIMP-2 in tumour cell cytoplasm (P < 0.01). Immunohistochemical detection of MT1-MMP and TIMP-2 might be useful for monitoring infiltration in colorectal carcinoma but is not correlated with distant metastases.
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Affiliation(s)
- R Kikuchi
- Department of Surgery II, Oita Medical University, Japan
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Higashi T, Miura K, Kikuchi R, Shimada K, Hiyamizu H, Ooi H, Iwabuchi Y, Hatakeyama S, Kubodera N. Characterization of new conjugated metabolites in bile of rats administered 24,25-dihydroxyvitamin D(3) and 25-hydroxyvitamin D(3). Steroids 2000; 65:281-94. [PMID: 10751640 DOI: 10.1016/s0039-128x(00)00087-8] [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: 11/17/2022]
Abstract
The characterization of new conjugated vitamin D metabolites in rat bile was performed using HPLC, liquid chromatography/tandem mass spectrometry combined derivatization, and GC-MS. After the administration of 24,25-dihydroxyvitamin D(3) to rats, 23, 25-dihydroxy-24-oxovitamin D(3) 23-glucuronide, 3-epi-24, 25-dihydroxyvitamin D(3) 24-glucuronide, and 24,25-dihydroxyvitamin D(3) 3-sulfate were obtained as new biliary metabolites together with 24,25-dihydroxyvitamin D(3) 3- and 24-glucuronides. The above metabolites, except 24,25-dihydroxyvitamin D(3) 3-glucuronide, were obtained from rats dosed with 25-hydroxyvitamin D(3). 23, 25-Dihydroxyvitamin D(3) 23-glucuronide was also obtained from the bile of rats administered 25-hydroxyvitamin D(3) in addition to its 3-glucuronide, 25-glucuronide, and 3-sulfate. Thus, it was found that 24,25-dihydroxyvitamin D(3) and 25-hydroxyvitamin D(3) were directly conjugated as glucuronide and sulfate, whereas at the C-23 position, they were hydroxylated and then conjugated. Furthermore, we found that the C-3 epimerization acts as one of the important pathways in vitamin D metabolism.
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Affiliation(s)
- T Higashi
- Faculty of Pharmaceutical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Japan
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