1
|
Aoki T, Ota Y, Izawa K, Osawa Y, Seta S, Tsuda B. Correlation of preference- and profile-based quality of life of Japanese oral cancer patients during the perioperative period measured using EQ-5D-5L and FACT-H&N. Int J Oral Maxillofac Surg 2021; 51:992-999. [PMID: 34551875 DOI: 10.1016/j.ijom.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: 03/16/2021] [Revised: 07/02/2021] [Accepted: 09/03/2021] [Indexed: 10/20/2022]
Abstract
The EuroQol 5-dimension 5-level (EQ-5D-5L) instrument is among the most used preference-based quality of life (QOL) measures for cost-utility analysis. Each dimension is evaluated on five levels. The aim of this study was to clarify whether the EQ-5D-5L, which consists of only five items, correlates with profile-based QOL measures in Japanese oral cancer patients during the perioperative period. One hundred participants with oral cancer undergoing radical therapy completed QOL assessments before treatment, at treatment completion, and 1 and 3 months after treatment using the EQ-5D-5L and Functional Assessment of Cancer Therapy - Head & Neck instrument (FACT-H&N, Japanese version). To clarify how the EQ-5D-5L reflects the FACT-H&N, multiple regression analyses were performed using FACT-H&N subscales. The ceiling effect of the EQ-5D-5L was investigated. The EQ-5D-5L moderately correlated with the FACT-H&N over the entire perioperative period (rs = 0.586, P < 0.01). In the multiple regression analysis, the EQ-5D-5L was strongly reflected in the physical wellbeing subscale of the FACT-H&N, excluding social wellbeing. The pre-treatment EQ-5D-5L score was decreased owing to the impacts of the dimensions of pain/discomfort and anxiety/depression. The EQ-5D-5L did not have a ceiling effect in oral cancer patients. The EQ-5D-5L appears to generally correlate with the FACT-H&N for oral cancer patients during the perioperative period.
Collapse
Affiliation(s)
- T Aoki
- Department of Oral and Maxillofacial Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
| | - Y Ota
- Department of Oral and Maxillofacial Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - K Izawa
- Department of Oral and Maxillofacial Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - Y Osawa
- Department of Oral and Maxillofacial Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - S Seta
- Department of Oral and Maxillofacial Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - B Tsuda
- Department of Breast and Endocrine Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| |
Collapse
|
2
|
Keino D, Kondoh K, Kim Y, Sudo A, Ohyama R, Morimoto M, Nihira H, Izawa K, Iwaki-Egawa S, Mori T, Kinoshita A. Successful treatment with cyclosporine and anti-tumour necrosis factor agent for deficiency of adenosine deaminase-2. Scand J Rheumatol 2020; 50:243-245. [PMID: 32720851 DOI: 10.1080/03009742.2020.1772868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- D Keino
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan.,Division of Hematology and Oncology, Kanagawa Children`s Medical Center, Yokohama, Japan
| | - K Kondoh
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - Y Kim
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - A Sudo
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - R Ohyama
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - M Morimoto
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - H Nihira
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - K Izawa
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - S Iwaki-Egawa
- Department of Life Sciences, Hokkaido Pharmaceutical University School of Pharmacy, Hokkaido, Japan
| | - T Mori
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| | - A Kinoshita
- Department of Pediatrics, St Marianna University School of Medicine Hospital, Kanagawa, Japan
| |
Collapse
|
3
|
Izawa K, Shirakura K, Kakiuchi K, Funahashi N, Maekawa N, Hino N, Tanaka T, Doi T, Okada Y. PRC2 Components Maintain DNA Hypermethylation of the Upstream Promoter and Regulate Robo4 Expression in Endothelial Cells. Biol Pharm Bull 2020; 43:742-746. [DOI: 10.1248/bpb.b19-01014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Kohei Izawa
- Graduate School of Pharmaceutical Sciences, Osaka University
| | | | - Koji Kakiuchi
- Graduate School of Pharmaceutical Sciences, Osaka University
| | | | - Naoki Maekawa
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Nobumasa Hino
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Toru Tanaka
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Takefumi Doi
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Yoshiaki Okada
- Graduate School of Pharmaceutical Sciences, Osaka University
| |
Collapse
|
4
|
Noguchi YT, Nakamura M, Hino N, Nogami J, Tsuji S, Sato T, Zhang L, Tsujikawa K, Tanaka T, Izawa K, Okada Y, Doi T, Kokubo H, Harada A, Uezumi A, Gessler M, Ohkawa Y, Fukada SI. Cell-autonomous and redundant roles of Hey1 and HeyL in muscle stem cells: HeyL requires Hes1 to bind diverse DNA sites. Development 2019; 146:dev.163618. [DOI: 10.1242/dev.163618] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 01/31/2019] [Indexed: 12/20/2022]
Abstract
The undifferentiated state of muscle stem (satellite) cells (MuSCs) is maintained by the canonical Notch pathway. Although three bHLH transcriptional factors, Hey1, HeyL, and Hes1, are considered to be potential effectors of the Notch pathway exerting anti-myogenic effects, neither HeyL nor Hes1 inhibits myogenic differentiation of myogenic cell lines. Furthermore, whether these factors work redundantly or cooperatively is unknown. Here, we showed cell-autonomous functions of Hey1 and HeyL in MuSCs using conditional and genetic null mice. Analysis of cultured MuSCs revealed anti-myogenic activity of both HeyL and Hes1. We found that HeyL forms heterodimeric complexes with Hes1 in living cells. Moreover, our ChIP-Seq experiments demonstrated that, compared with HeyL alone, HeyL-Hes1 heterodimer bound with high affinity to specific sites in the chromatin including the cis-element of Hey1. Finally, the analyses of myogenin promoter activity showed that HeyL and Hes1 acted synergistically to suppress myogenic differentiation. Collectively, those results suggest that HeyL and Hey1 function redundantly in MuSCs, and that HeyL requires Hes1 for effective DNA binding and biological activity.
Collapse
Affiliation(s)
- Yu-taro Noguchi
- Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Miki Nakamura
- Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Nobumasa Hino
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Jumpei Nogami
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Sayaka Tsuji
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takahiko Sato
- Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Lidan Zhang
- Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kazutake Tsujikawa
- Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Toru Tanaka
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kohei Izawa
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yoshiaki Okada
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takefumi Doi
- Laboratory of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiroki Kokubo
- Department of Cardiovascular Physiology and Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima 734-8551, Japan
| | - Akihito Harada
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Akiyoshi Uezumi
- Department of Geriatric Medicine, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo 173-0015, Japan
| | - Manfred Gessler
- Developmental Biochemistry, Theodor-Boveri-Institute / Biocenter, and Comprehensive Cancer Center Mainfranken, University of Wuerzburg, 97074 Wuerzburg, Germany
| | - Yasuyuki Ohkawa
- Division of Transcriptomics, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - So-ichiro Fukada
- Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| |
Collapse
|
5
|
Tanaka T, Izawa K, Maniwa Y, Okamura M, Okada A, Yamaguchi T, Shirakura K, Maekawa N, Matsui H, Ishimoto K, Hino N, Nakagawa O, Aird WC, Mizuguchi H, Kawabata K, Doi T, Okada Y. ETV2-TET1/TET2 Complexes Induce Endothelial Cell-Specific Robo4 Expression via Promoter Demethylation. Sci Rep 2018; 8:5653. [PMID: 29618782 PMCID: PMC5884809 DOI: 10.1038/s41598-018-23937-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 03/23/2018] [Indexed: 01/18/2023] Open
Abstract
Although transcription factors regulating endothelial cell (EC)-specific gene expression have been identified, it is not known how those factors induce EC-specificity. We previously reported that DNA hypomethylation of the proximal promoter elicits EC-specific expression of Roundabout4 (Robo4). However, the mechanisms establishing EC-specific hypomethylation of the Robo4 promoter remain unknown. In this study, we demonstrated that the hypermethylated Robo4 proximal promoter is demethylated as human iPS cells differentiate into endothelial cells. Reporter assays demonstrated that ETV2, an ETS family transcription factor, bound to ETS motifs in the proximal promoter and activated Robo4 expression. Immunoprecipitation demonstrated direct interaction between ETV2 and methylcytosine-converting enzymes TET1 and TET2. Adenoviral expression of ETV2-TET1/TET2 complexes demethylated the Robo4 promoter and induced Robo4 expression in non-ECs. In summary, we propose a novel regulatory model of EC-specific gene expression via promoter demethylation induced by ETV2-TET1/TET2 complexes during endothelial differentiation.
Collapse
Affiliation(s)
- Toru Tanaka
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Kohei Izawa
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Yusuke Maniwa
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Maki Okamura
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Atsumasa Okada
- Laboratory of Stem Cell Regulation, National Institutes of Biomedical Innovation, Health and Nutrition, Ibaraki City, Osaka, 567-0085, Japan
| | - Tomoko Yamaguchi
- Laboratory of Stem Cell Regulation, National Institutes of Biomedical Innovation, Health and Nutrition, Ibaraki City, Osaka, 567-0085, Japan
| | - Keisuke Shirakura
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Naoki Maekawa
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Hayato Matsui
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Kenji Ishimoto
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Nobumasa Hino
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Osamu Nakagawa
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita City, Osaka, 565-8565, Japan
| | - William C Aird
- Center for Vascular Biology Research and Division of Molecular and Vascular Medicine, Beth Israel Deaconess Medical Center, Boston, MA, 02215, USA
| | - Hiroyuki Mizuguchi
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Kenji Kawabata
- Laboratory of Stem Cell Regulation, National Institutes of Biomedical Innovation, Health and Nutrition, Ibaraki City, Osaka, 567-0085, Japan
| | - Takefumi Doi
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan
| | - Yoshiaki Okada
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita City, Osaka, 565-0871, Japan.
| |
Collapse
|
6
|
Nihira H, Nakagawa K, Izawa K, Kawai T, Yasumi T, Nishikomori R, Nambu M, Miyagawa-Hayashino A, Nomura T, Kabashima K, Ito M, Iwaki-Egawa S, Sasahara Y, Nakayama M, Heike T. Fever of unknown origin with rashes in early infancy is indicative of adenosine deaminase type 2 deficiency. Scand J Rheumatol 2017; 47:170-172. [DOI: 10.1080/03009742.2017.1324912] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- H Nihira
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - K Nakagawa
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - K Izawa
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - T Kawai
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - T Yasumi
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - R Nishikomori
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - M Nambu
- Department of Pediatrics, Tenri Hospital, Tenri, Japan
| | - A Miyagawa-Hayashino
- Department of Diagnostic Pathology, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - T Nomura
- Department of Dermatology, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - K Kabashima
- Department of Dermatology, Faculty of Medicine, Kyoto University, Kyoto, Japan
| | - M Ito
- Department of Life Sciences, Hokkaido Pharmaceutical University School of Pharmacy, Sapporo, Japan
| | - S Iwaki-Egawa
- Department of Life Sciences, Hokkaido Pharmaceutical University School of Pharmacy, Sapporo, Japan
| | - Y Sasahara
- Department of Pediatrics, Faculty of Medicine, Tohoku University, Sendai, Japan
| | - M Nakayama
- Kazusa DNA Research Institute, Kisarazu, Japan
| | - T Heike
- Department of Pediatrics, Faculty of Medicine, Kyoto University, Kyoto, Japan
| |
Collapse
|
7
|
Tanaka T, Maekawa N, Kashio T, Izawa K, Ishiba R, Shirakura K, Ishimoto K, Hino N, Aird WC, Doi T, Okada Y. Tumor Necrosis Factor α Induces the Expression of the Endothelial Cell-Specific Receptor Roundabout4 through the Nuclear Factor-κB Pathway. Biol Pharm Bull 2017; 40:504-509. [DOI: 10.1248/bpb.b16-00938] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Toru Tanaka
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Naoki Maekawa
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Taito Kashio
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Kohei Izawa
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Ryosuke Ishiba
- Graduate School of Pharmaceutical Sciences, Osaka University
| | | | - Kenji Ishimoto
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Nobumasa Hino
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - William C. Aird
- Center for Vascular Biology Research and Division of Molecular and Vascular Medicine, Beth Israel Deaconess Medical Center
| | - Takefumi Doi
- Graduate School of Pharmaceutical Sciences, Osaka University
| | - Yoshiaki Okada
- Graduate School of Pharmaceutical Sciences, Osaka University
| |
Collapse
|
8
|
Kanameishi S, Nakamizo S, Endo Y, Fujisawa A, Dainichi T, Tanaka T, Izawa K, Nishikomori R, Kabashima K. High level of serum human interleukin-18 in a patient with pyogenic arthritis, pyoderma gangrenosum and acne syndrome. J Eur Acad Dermatol Venereol 2016; 31:e115-e116. [PMID: 27505688 DOI: 10.1111/jdv.13856] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- S Kanameishi
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - S Nakamizo
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Singapore Immunology Network (SIgN) and Institute of Medical Biology, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| | - Y Endo
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - A Fujisawa
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Dainichi
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - T Tanaka
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Izawa
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - R Nishikomori
- Department of Pediatrics, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - K Kabashima
- Department of Dermatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.,Singapore Immunology Network (SIgN) and Institute of Medical Biology, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore
| |
Collapse
|
9
|
Taupin M, Knebel G, Matsuda TD, Lapertot G, Machida Y, Izawa K, Brison JP, Flouquet J. Thermal Conductivity through the Quantum Critical Point in YbRh_{2}Si_{2} at Very Low Temperature. Phys Rev Lett 2015; 115:046402. [PMID: 26252699 DOI: 10.1103/physrevlett.115.046402] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Indexed: 06/04/2023]
Abstract
The thermal conductivity of YbRh_{2}Si_{2} has been measured down to very low temperatures under field in the basal plane. An additional channel for heat transport appears below 30 mK, both in the antiferromagnetic and paramagnetic states, respectively, below and above the critical field suppressing the magnetic order. This excludes antiferromagnetic magnons as the origin of this additional contribution to thermal conductivity. Moreover, this low temperature contribution prevails a definite conclusion on the validity or violation of the Wiedemann-Franz law at the field-induced quantum critical point.
Collapse
Affiliation(s)
- M Taupin
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - G Knebel
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - T D Matsuda
- Advanced Science Research Center, JAEA, Tokai, Ibaraki 319-1195, Japan
- Department of Physics, Tokyo Metropolitan University 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan
| | - G Lapertot
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Izawa
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - J-P Brison
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| | - J Flouquet
- Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France
| |
Collapse
|
10
|
Saito T, Izawa K, Omori Y, Watanabe S. Functional independence and difficulty scale: instrument development and validity evaluation. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1242] [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: 11/29/2022]
|
11
|
Takahashi T, Yamada S, Tanabe K, Izawa K, Itoh H, Murayama M. Cardiopulmonary responses at various angles of cycle backrest inclination. J Jpn Phys Ther Assoc 2015; 2:31-6. [PMID: 25792911 DOI: 10.1298/jjpta.2.31] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/1998] [Accepted: 01/30/1999] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to evaluate cardiopulmonary responses during submaximal cycle exercise at various angles of backrest inclination. Ten healthy Japanese men of mean age 25.9 yrs, height 170.6 cm, and body mass 66.1 kg, performed cycle exercises at a constant workload which reached the anaerobic threshold, at 20 degrees, 40 degrees, and 60 degrees of backrest inclination from the vertical plane, but the angle between the seat and back rest was kept at 110 degrees. The results were as follows: 1) Both cardiac output and stroke volume showed a higher value at the resting control state and during exercise as the backrest angle increased. 2) Oxygen consumption, carbon dioxide output, heart rate, gas exchange ratio, and oxygen pulse were not affected by the angle of backrest inclination. 3) Tidal volume at 20 degrees of backrest inclination was higher than at 60 degrees. 4) No significant differences were found in minute ventilation between each backrest angle. These findings suggest that changes in the backrest angle significantly alter cardiopulmonary parameters at rest and during exercise; in particular, an angle difference of 40 degrees may be enough to alter tidal volume, cardiac output and stroke volume, but not the minute ventilation.
Collapse
Affiliation(s)
- T Takahashi
- Department of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kanagawa-ken 216, Japan
| | - S Yamada
- Department of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kanagawa-ken 216, Japan
| | - K Tanabe
- Department of 2nd Internal Medicine, St. Marianna University School of Medicine, Kanagawa-ken 216, Japan
| | - K Izawa
- Department of Rehabilitation Medicine, St. Marianna University School of Medicine Hospital, Kanagawa-ken 216, Japan
| | - H Itoh
- Department of 2nd Internal Medicine, St. Marianna University School of Medicine, Kanagawa-ken 216, Japan
| | - M Murayama
- Department of 2nd Internal Medicine, St. Marianna University School of Medicine, Kanagawa-ken 216, Japan
| |
Collapse
|
12
|
Yoneda M, Izawa K, Wakitani S, Nakasato S, Hayashida K, Nakagawa S. Diagnostic imaging of unstable superior glenoid labral detachment: a comparison between MR arthrography and unenhanced MRI. Mod Rheumatol 2014; 11:140-4. [DOI: 10.3109/s101650170026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
13
|
Nakagawa K, Shimura N, Shirasaki Y, Yamagishi M, Izawa K, Nishikomori R, Kawai T, Yasumi T, Heike T, Ohara O. PW02-029 - Single cell fluorescent immunoassay of CINCA/NOMID. Pediatr Rheumatol Online J 2013. [PMCID: PMC3952168 DOI: 10.1186/1546-0096-11-s1-a170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
14
|
Kawai T, Nishikomori R, Awaya M, Nakagawa K, Izawa K, Yasumi T, Ohara O, Heike T. P03-023 – Autoinflammatory diseases database in Japan. Pediatr Rheumatol Online J 2013. [PMCID: PMC3953057 DOI: 10.1186/1546-0096-11-s1-a221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
15
|
Machida Y, Tomokuni K, Izawa K, Lapertot G, Knebel G, Brison JP, Flouquet J. Verification of the Wiedemann-Franz law in YbRh2Si2 at a quantum critical point. Phys Rev Lett 2013; 110:236402. [PMID: 25167518 DOI: 10.1103/physrevlett.110.236402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 02/04/2013] [Indexed: 06/03/2023]
Abstract
The thermal conductivity measurements are performed on the heavy-fermion compound YbRh(2)Si(2) down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B(c)=0.66 T∥c axis. In the limit as T→0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP despite the destruction of the standard signature of Fermi liquid. Our results place strong constraints on models that attempt to describe the nature of the unconventional quantum criticality of YbRh(2)Si(2).
Collapse
Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Tomokuni
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - K Izawa
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | - G Lapertot
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - G Knebel
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - J-P Brison
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| | - J Flouquet
- SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France
| |
Collapse
|
16
|
Venmathi Maran B, Tang D, Madinabeitia I, Izawa K, Ohtsuka S, Jang D, Nagasawa K. Redescription of Pseudacanthocanthopsis secunda(Yamaguti and Yamasu, 1960) (Copepoda: Chondracanthidae) parasitic on marine fishes from the Seto Inland Sea, Japan and the East China Sea off Japan and Korea. J NAT HIST 2013. [DOI: 10.1080/00222933.2012.738831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
17
|
Machida Y, Tomokuni K, Ogura C, Izawa K, Kuga K, Nakatsuji S, Lapertot G, Knebel G, Brison JP, Flouquet J. Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh2Si2: a comparative study. Phys Rev Lett 2012; 109:156405. [PMID: 23102346 DOI: 10.1103/physrevlett.109.156405] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 07/25/2012] [Indexed: 06/01/2023]
Abstract
The thermoelectric coefficients have been measured down to a very low temperature for the Yb-based heavy-fermion compounds β-YbAlB4 and YbRh2Si2, often considered as model systems for the local quantum criticality case. We observe a striking difference in the behavior of the Seebeck coefficient S in the vicinity of their respective quantum critical point (QCP). Approaching the critical field, S/T is enhanced in β-YbAlB4, but drastically reduced in YbRh2Si2. The ratio of thermopower to specific heat remains constant for β-YbAlB4, but it is significantly reduced near the QCP in YbRh2Si2. In both systems, on the other hand, the Nernst coefficient shows a diverging behavior near the QCP. The interplay between valence and magnetic quantum criticality and the additional possibility of a Lifshitz transition crossing the critical field under magnetic field are discussed as the origin of the different behaviors of these compounds.
Collapse
Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Machida Y, Itoh A, So Y, Izawa K, Haga Y, Yamamoto E, Kimura N, Onuki Y, Tsutsumi Y, Machida K. Twofold spontaneous symmetry breaking in the heavy-fermion superconductor UPt3. Phys Rev Lett 2012; 108:157002. [PMID: 22587277 DOI: 10.1103/physrevlett.108.157002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Indexed: 05/31/2023]
Abstract
The field-orientation dependent thermal conductivity of the heavy-fermion superconductor UPt3 was measured down to very low temperatures and under magnetic fields throughout the distinct superconducting phases: B and C phases. In the C phase, a striking twofold oscillation of the thermal conductivity within the basal plane is resolved reflecting the superconducting gap structure with a line of node along the a axis. Moreover, we find an abrupt vanishing of the oscillation across a transition to the B phase, as a clear indication of a change of gap symmetries. We also identify extra two line nodes below and above the equator in both B and C phases. From these results together with the symmetry consideration, the gap function of UPt3 is determined as a E(1u) representation characterized by a combination of two line nodes at the tropics and point nodes at the poles.
Collapse
Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Izawa K, Nishikomori R, Tanikaze N, Saito MK, Goldbach-Mansky R, Aksentijevich I, Yasumi T, Kawai T, Nakahata T, Heike T, Ohara O. Diagnosis of NLRP3 somatic mosaicism in CINCA/NOMID patients using next-generation sequencing. Pediatr Rheumatol Online J 2011. [PMCID: PMC3194660 DOI: 10.1186/1546-0096-9-s1-p292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
20
|
Abe J, Nishikomori R, Izawa K, Awaya T, Kawai T, Yasumi T, Heike T, Hiragi N, Hiragi T. Clinical heterogeneity among a three-generation Japanese family with D18N TREX1 mutation for Aicardi-Goutières syndrome / familial chilblain lupus. Pediatr Rheumatol Online J 2011. [PMCID: PMC3194642 DOI: 10.1186/1546-0096-9-s1-p276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
21
|
Machida Y, Sakai S, Izawa K, Okuyama H, Watanabe T. Enhanced quasiparticle heat conduction in the multigap superconductor Lu2Fe3Si5 . Phys Rev Lett 2011; 106:107002. [PMID: 21469825 DOI: 10.1103/physrevlett.106.107002] [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: 09/13/2010] [Indexed: 05/30/2023]
Abstract
Thermal transport measurements have been made on the Fe-based superconductor Lu2Fe3Si5 (T(c) ∼ 6 K) down to a very low temperature T(c)/120. The field and temperature dependences of the thermal conductivity confirm the multigap superconductivity with fully opened gaps on the whole Fermi surfaces. In comparison to MgB2, Lu2Fe3Si5 reveals a remarkably enhanced quasiparticle heat conduction in the mixed state. The results can be interpreted as a consequence of the unequal weight of the Fe 3d-electron character among the distinct bands.
Collapse
Affiliation(s)
- Y Machida
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | | | | | | | | |
Collapse
|
22
|
Minobe K, Ono R, Matsumine A, Shibata-Minoshima F, Izawa K, Oki T, Kitaura J, Iino T, Takita J, Iwamoto S, Hori H, Komada Y, Uchida A, Hayashi Y, Kitamura T, Nosaka T. Expression of ADAMTS4 in Ewing's sarcoma. Int J Oncol 2010; 37:569-81. [PMID: 20664926 DOI: 10.3892/ijo_00000706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ewing's sarcoma (EWS) is a malignant bone tumor that frequently occurs in teenagers. Genetic mutations which cause EWS have been investigated, and the most frequent one proved to be a fusion gene between EWS gene of chromosome 22 and the FLI1 gene of chromosome 11. However, a limited numbers of useful biological markers for diagnosis of EWS are available. In this study, we identified ADAMTS4 (a disintegrin and metalloproteinase with thrombospondin motifs) as a possible tumor marker for EWS using the retrovirus-mediated signal sequence trap method. ADAMTS4 is a secreted protein of 837 amino acids with a predicted molecular mass of 98-100 kDa. It is a member of metalloprotease family, is expressed mainly in cartilage and brain, and regulates the degradation of aggrecans. ADAMTS4 has been suggested to be involved in arthritic diseases and gliomas. Herein, we show that ADAMTS4 mRNA was expressed in all primary EWS samples and all EWS-derived cell lines examined, while its expression was detected only in small subpopulations of other solid tumors. Furthermore, ADAMTS4 expression was found to be regulated by EWS-FLI1 fusion gene-dependent manner. We also demonstrated that ADAMTS4 protein was highly expressed in tumor samples of the patients with EWS by using immunohistochemistry. These results suggest that ADAMTS4 is a novel tumor marker for EWS.
Collapse
Affiliation(s)
- K Minobe
- Department of Microbiology and Molecular Genetics, Mie University Graduate School of Medicine, Tsu, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Iguchi Y, Ishii J, Nakayama H, Ishikura A, Izawa K, Tanaka T, Ogino C, Kondo A. Control of signalling properties of human somatostatin receptor subtype-5 by additional signal sequences on its amino-terminus in yeast. J Biochem 2010; 147:875-84. [DOI: 10.1093/jb/mvq023] [Citation(s) in RCA: 26] [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: 11/13/2022] Open
|
24
|
Kurabayashi H, Kanai N, Sato Y, Izawa K, Yamazaki H, Aoki T, Ota Y. P.306 Analysis of metastasis to the oro-maxillofacial region. J Craniomaxillofac Surg 2008. [DOI: 10.1016/s1010-5182(08)72094-8] [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: 10/21/2022] Open
|
25
|
Izawa K, Behnia K, Matsuda Y, Shishido H, Settai R, Onuki Y, Flouquet J. Thermoelectric response near a quantum critical point: the case of CeCoIn5. Phys Rev Lett 2007; 99:147005. [PMID: 17930708 DOI: 10.1103/physrevlett.99.147005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2007] [Indexed: 05/25/2023]
Abstract
We present a study of thermoelectric coefficients in CeCoIn5 down to 0.1 K and up to 16 T in order to probe the thermoelectric signatures of quantum criticality. In the vicinity of the field-induced quantum critical point, the Nernst coefficient nu exhibits a dramatic enhancement without saturation down to the lowest measured temperature. The dimensionless ratio of the Seebeck coefficient to the electronic specific heat shows a minimum at a temperature close to threshold of the quasiparticle formation. Close to Tc(H), in the vortex-liquid state, the Nernst coefficient behaves anomalously in puzzling contrast with other superconductors and standard vortex dynamics.
Collapse
Affiliation(s)
- K Izawa
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo, Japan
| | | | | | | | | | | | | |
Collapse
|
26
|
Ota Y, Aoki T, Karakida K, Yamazaki H, Otsuru M, Izawa K, Kaneko K, Naito H, Shiiki K. P.233 Infratemporal fossa dissection for oral cancer accompanied by pterygoid muscles invasion: Resectability and long-term results. J Craniomaxillofac Surg 2006. [DOI: 10.1016/s1010-5182(06)60741-5] [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] Open
|
27
|
Aoki T, Yamaguchi H, Naito H, Shiiki K, Izawa K, Ota Y, Sakamoto H, Kaneko A. Premedication with cyclooxygenase-2 inhibitor meloxicam reduced postoperative pain in patients after oral surgery. Int J Oral Maxillofac Surg 2006; 35:613-7. [PMID: 16540287 DOI: 10.1016/j.ijom.2006.01.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2005] [Revised: 08/22/2005] [Accepted: 01/30/2006] [Indexed: 11/26/2022]
Abstract
The efficacy of the selective cyclooxygenase-2 (COX-2) inhibitor meloxicam for treatment of postoperative oral surgical pain was assessed in a randomized controlled trial. Patients undergoing unilateral mandibular 3rd molar extraction surgery were allocated to 3 groups, A, B and C. After oral premedication of meloxicam 10 mg in group A, ampiroxicam 27 mg in group B and placebo in group C, surgery was completed within 30 min under local anaesthesia using 2% lidocaine. For postoperative pain relief the patients were allowed to take oral loxoprofen (60 mg per tablet). Postoperative pain was evaluated at the clinic on the 1st, 7th and 14th postoperative day (POD) using a visual analogue scale (VAS), as was the number of loxoprofen tablets consumed, and the results were compared among the 3 groups with statistical significance of P<0.05. VAS scores on 1 POD were significantly lower in group A than in group C. Loxoprofen consumption on the day of surgery and 1 POD was significantly lower in group A than in group C (P<0.01). Total analgesic consumption was significantly lower in groups A and B than in group C (P<0.02). The COX-2 inhibitor, meloxicam 10 mg used for premedication reduced postoperative pain compared with control in oral surgery.
Collapse
Affiliation(s)
- T Aoki
- Department of Oral and Maxillofacial Surgery, Tokai University Hachioji Hospital, Hachioji, Tokyo, Japan.
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Kang X, Xiao X, Harata M, Bai Y, Nakazaki Y, Soda Y, Kurita R, Tanaka T, Komine F, Izawa K, Kunisaki R, Setoyama M, Nishimori H, Natsume A, Sunamura M, Lozonshi L, Saitoh I, Tokino T, Asano S, Nakamura Y, Tani K. Antiangiogenic activity of BAI1 in vivo: implications for gene therapy of human glioblastomas. Cancer Gene Ther 2005; 13:385-92. [PMID: 16244591 DOI: 10.1038/sj.cgt.7700898] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Glioblastomas are the most common primary brain tumors in adults. These tumors exhibit a high degree of vascularization, and malignant progression from astrocytoma to glioblastoma is often accompanied by increased angiogenesis and the upregulation of vascular endothelial growth factor and its receptors. In this study, we investigated the in vivo antiangiogenic and antitumor effects of brain-specific angiogenesis inhibitor 1 (BAI1) using human glioblastoma cell lines. Glioblastoma cells were transduced with an adenoviral vector encoding BAI1 (AdBAI1), and Northern and Western blot analyses, respectively, demonstrated BAI1 mRNA and protein expression in the transduced tumor cells. Using an in vivo neovascularization assay, we found that angiogenesis surrounding AdBAI1-transduced glioblastoma cells transplanted into transparent skinfold chambers of SCID mice was significantly impaired compared to control treated cells. Additionally, in vivo inoculation with AdBAI1 of established subcutaneous or intracerebral transplanted tumors significantly impaired tumor growth and promoted increased mouse survival. Morphologically, the tumors exhibited signs of impaired angiogenesis, such as extensive necrosis and reduced intratumoral vascular density. Taken together, these data strongly indicate that BAI1 may be an excellent gene therapy candidate for the treatment of brain tumors, especially human glioblastomas.
Collapse
Affiliation(s)
- X Kang
- Division of Molecular Therapy, Advanced Clinical Research Center, The University of Tokyo, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Seyfarth G, Brison JP, Méasson MA, Flouquet J, Izawa K, Matsuda Y, Sugawara H, Sato H. Multiband superconductivity in the heavy fermion compound PrOs4Sb12. Phys Rev Lett 2005; 95:107004. [PMID: 16196955 DOI: 10.1103/physrevlett.95.107004] [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] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Indexed: 05/04/2023]
Abstract
The thermal conductivity of the heavy fermion superconductor Pr(Os(4)Sb(12) was measured down to T(c)/40 throughout the vortex state. At lowest temperatures and for magnetic fields H approximately 0.07H(c2), already 40% of the normal state thermal conductivity is restored. This behavior (similar to that observed in MgB2) is a clear signature of multiband superconductivity in this compound.
Collapse
|
30
|
Izawa K, Kasahara Y, Matsuda Y, Behnia K, Yasuda T, Settai R, Onuki Y. Line nodes in the superconducting gap function of noncentrosymmetric CePt3Si. Phys Rev Lett 2005; 94:197002. [PMID: 16090199 DOI: 10.1103/physrevlett.94.197002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2004] [Indexed: 05/03/2023]
Abstract
The superconducting gap structure of recently discovered heavy fermion CePt(3)Si without spatial inversion symmetry was investigated by thermal transport measurements down to 40 mK. In zero field a residual T-linear term was clearly resolved as T --> 0, with a magnitude in good agreement with the value expected for a residual normal fluid with a nodal gap structure, together with a T2 dependence at high temperatures. With an applied magnetic field, the thermal conductivity grows rapidly, in dramatic contrast to fully gapped superconductors, and exhibits one-parameter scaling with T/sqrt[H]. These results place an important constraint on the order parameter symmetry; that is, CePt(3)Si is most likely to have line nodes.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba, Japan
| | | | | | | | | | | | | |
Collapse
|
31
|
Behnia K, Bel R, Kasahara Y, Nakajima Y, Jin H, Aubin H, Izawa K, Matsuda Y, Flouquet J, Haga Y, Onuki Y, Lejay P. Thermal transport in the hidden-order state of URu2Si2. Phys Rev Lett 2005; 94:156405. [PMID: 15904167 DOI: 10.1103/physrevlett.94.156405] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2004] [Indexed: 05/02/2023]
Abstract
We present a study of thermal conductivity in the normal state of the heavy-fermion superconductor URu2Si2. Ordering at 18 K leads to a steep increase in thermal conductivity and (in contrast with all other cases of magnetic ordering in heavy-fermion compounds) to an enhancement of the Lorenz number. By linking this observation to several other previously reported features, we conclude that most of the carriers disappear in the ordered state and this leads to a drastic increase in both the phononic and electronic mean free path.
Collapse
Affiliation(s)
- K Behnia
- Laboratoire de Physique Quantique (CNRS), ESPCI, 10 Rue de Vauquelin, 75231 Paris, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Huxley AD, Measson MA, Izawa K, Dewhurst CD, Cubitt R, Grenier B, Sugawara H, Flouquet J, Matsuda Y, Sato H. Flux-line lattice distortion in PrOs4Sb12. Phys Rev Lett 2004; 93:187005. [PMID: 15525200 DOI: 10.1103/physrevlett.93.187005] [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] [Subscribe] [Scholar Register] [Received: 05/28/2004] [Indexed: 05/24/2023]
Abstract
We report that the flux-line lattice in the cubic superconductor Pr(Os4Sb12 is strongly distorted from an ideal hexagonal lattice at very low temperatures in a small applied field. We attribute this to the presence of gap nodes in the superconducting state on at least some Fermi-surface sheets.
Collapse
Affiliation(s)
- A D Huxley
- DRFMC/SPSMS, CEA-Grenoble, 38054 Grenoble, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Bel R, Behnia K, Nakajima Y, Izawa K, Matsuda Y, Shishido H, Settai R, Onuki Y. Giant Nernst effect in CeCoIn5. Phys Rev Lett 2004; 92:217002. [PMID: 15245310 DOI: 10.1103/physrevlett.92.217002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2003] [Indexed: 05/24/2023]
Abstract
We present a study of Nernst and Seebeck coefficients of the heavy-fermion superconductor CeCoIn5. Below 18 K, concomitant with a field-dependent Seebeck coefficient, a large sublinear Nernst signal emerges with a magnitude drastically exceeding what is expected for a multiband Fermi-liquid metal. In the mixed state, in contrast with all other superconductors studied before, this signal overwhelms the one associated with the motion of superconducting vortices. The results point to a hitherto unknown source of transverse thermoelectricity in strongly interacting electrons.
Collapse
Affiliation(s)
- R Bel
- Laboratoire de Physique Quantique (CNRS), ESPCI, 10 Rue de Vauquelin, 75231 Paris, France
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Maruyama T, Kozai S, Takamatsu S, Izawa K. Introduction of a benzoyl group onto 6-chloropurine riboside in aqueous solution and its application to the synthesis of nucleoside derivatives. Nucleic Acids Symp Ser 2003:103-4. [PMID: 12903289 DOI: 10.1093/nass/44.1.103] [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] [Indexed: 11/14/2022]
Abstract
A benzoyl group was introduced onto the 3'-hydroxyl group of 6-chloropurine riboside by treatment with benzoic anhydride in the presence of a base in aqueous solution. The product (3b) was converted to 9-(2,3-Di-deoxy-2-fluoro-beta-D-threo-pentofuranosyl)adenine (1, FddA) in 6 steps, including radical deoxygenation.
Collapse
Affiliation(s)
- T Maruyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | | | | | | |
Collapse
|
35
|
Bai Y, Soda Y, Izawa K, Tanabe T, Kang X, Tojo A, Hoshino H, Miyoshi H, Asano S, Tani K. Effective transduction and stable transgene expression in human blood cells by a third-generation lentiviral vector. Gene Ther 2003; 10:1446-57. [PMID: 12900759 DOI: 10.1038/sj.gt.3302026] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Difficulty in gene transduction of human blood cells, including hematopoietic stem cells, has hampered the development of gene therapy applications for hematological disorders, encouraging the development and use of new gene delivery systems. In this study, we used a third-generation self-inactivating (SIN) lentiviral vector system based on human immunodeficiency virus type 1 (HIV-1) to improve transduction efficiency and prevent vector-related toxicity. The transduction efficiency of the HIV-1-based vector was compared directly with the Moloney murine leukemia virus (MLV) SIN vector in human leukemia cell lines. Initial transduction efficiencies were almost 100% for the HIV and less than 50% for the MLV vectors. Similar results were observed in 11 types of primary cells obtained from leukemia or myeloma patients. Transgene expression persisted for 8 weeks in cells transduced with the HIV vector, but declined with the MLV vector. In addition, resting peripheral blood lymphocytes and CD34(+) hematopoietic cells were transduced successfully with the HIV vector, but not with the MLV vector. Finally, we confirmed vector gene integration in almost all colony-forming cells transduced with the HIV vector, but not with the MLV vector. In conclusion, this lentiviral vector is an excellent gene transduction system for human blood cells because of its high gene transduction and host chromosome integration efficiency.
Collapse
Affiliation(s)
- Y Bai
- Division of Molecular Therapy, Advanced Clinical Research Center, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Izawa K, Nakajima Y, Goryo J, Matsuda Y, Osaki S, Sugawara H, Sato H, Thalmeier P, Maki K. Multiple superconducting phases in new heavy fermion superconductor PrOs4Sb12. Phys Rev Lett 2003; 90:117001. [PMID: 12688955 DOI: 10.1103/physrevlett.90.117001] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2002] [Indexed: 05/24/2023]
Abstract
The superconducting gap structure of recently discovered heavy fermion superconductor PrOs4Sb12 was investigated by using thermal transport measurements in magnetic field rotated relative to the crystal axes. We demonstrate that a novel change in the symmetry of the superconducting gap function occurs deep inside the superconducting state, giving a clear indication of the presence of two distinct superconducting phases with twofold and fourfold symmetries. We infer that the gap functions in both phases have a point node singularity, in contrast to the familiar line node singularity observed in almost all unconventional superconductors.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Tateishi M, Ohashi K, Kobayashi K, Hashimoto T, Yamaguchi J, Fujioka H, Izawa K, Masada M. Interindividual variation in the ratio between plasma morphine and its metabolites in cancer patients. Int J Clin Pharmacol Res 2003; 23:75-82. [PMID: 15018021] [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: 04/29/2023]
Abstract
In 25 cancer patients treated with slow-release oral morphine and in 10 cancer patients treated with continuous infusion of morphine, plasma steady-state concentrations of morphine (M), morphine-3-glucuronide (M-3-G) and morphine-6-glucuronide (M-6-G) were determined by high-performance liquid chromatography. Blood samples were withdrawn at 0, 2 and 6 h after oral administration in patients treated with slow-release oral morphine and once or twice a day in patients treated with continuous infusion of morphine. In four cancer patients treated with continuous infusion of morphine, in order to analyze chronopharmacokinetic variability, the M-3-G/M ratio was observed at 12:00 h and 24:00 h. No significant changes were observed in M-3-G/M ratios and M-6-G ratios at 0, 2, and 6 h after oral administration of morphine. The M-3-G/M ratio (38.6 +/- 25.7) in the oral morphine group was significantly higher than that (15.3 +/- 12.9) in the continuous infusion group (p < 0.01). There was an approximately 10-fold interindividual variation in the M-3-G/M ratio both in the continuous infusion group and in the oral morphine group. These results suggest that the activity of UDP glucuronosyltransferase 2B7 in the intestinal metabolism of morphine may play an active part in a large interindividual variation in the ratio of metabolites to morphine. Further studies are needed to clarify this hypothesis.
Collapse
Affiliation(s)
- M Tateishi
- Department of Hospital Pharmacy, National Fukuokahigashi Hospital, Koga, Japan
| | | | | | | | | | | | | | | |
Collapse
|
38
|
Izawa K, Kamata K, Nakajima Y, Matsuda Y, Watanabe T, Nohara M, Takagi H, Thalmeier P, Maki K. Gap function with point nodes in borocarbide superconductor YNi2B2C. Phys Rev Lett 2002; 89:137006. [PMID: 12225056 DOI: 10.1103/physrevlett.89.137006] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2002] [Indexed: 05/23/2023]
Abstract
To determine the superconducting gap function of YNi2B2C, the c-axis thermal conductivity kappa(zz) was measured in H rotated in various directions. The angular variation of kappa(zz) in H rotated within the ab plane shows a peculiar fourfold oscillation with narrow cusps. The amplitude of this fourfold oscillation becomes very small when H is rotated conically around the c axis with a tilt angle of 45 degrees. These results provide the first compelling evidence that the gap function has point nodes located along the a and b axes. This unprecedented gap structure challenges the current view on the pairing mechanism.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Izawa K, Okuyama T, Fueno T. Electrophilic additions to dienes. V. Orientation and kinetic secondary isotope effects in the addition of 2,4-dinitrobenzenesulfenyl chloride to phenylallene. J Am Chem Soc 2002. [DOI: 10.1021/ja00793a067] [Citation(s) in RCA: 14] [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: 11/28/2022]
|
40
|
Okabayashi H, Izawa K, Yamamoto T, Masuda H, Nishio E, O'Connor CJ. Surface structure of silica gel reacted with 3-mercaptopropyltriethoxysilane and 3-aminopropyltriethoxysilane: formation of the S-S bridge structure and its characterization by Raman scattering and diffuse reflectance Fourier transform spectroscopic studies. Colloid Polym Sci 2002. [DOI: 10.1007/s003960100585] [Citation(s) in RCA: 29] [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: 10/27/2022]
|
41
|
Izawa K, Yamaguchi H, Sasaki T, Matsuda Y. Superconducting gap structure of kappa-(BEDT-TTF)2Cu(NCS)2 probed by thermal conductivity tensor. Phys Rev Lett 2002; 88:027002. [PMID: 11801028 DOI: 10.1103/physrevlett.88.027002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2001] [Indexed: 05/23/2023]
Abstract
The thermal conductivity of organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2 (Tc = 10.4 K) has been studied in a magnetic field rotating within the 2D superconducting planes with high alignment precision. At low temperatures ( T < or = 0.5 K), a clear fourfold symmetry in the angular variation, which is characteristic of a d-wave superconducting gap with nodes along the directions rotated 45 degrees relative to the b and c axes of the crystal, was resolved. The determined nodal structure is inconsistent with recent theoretical predictions of superconductivity induced by the antiferromagnetic spin fluctuation.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | | | | | | |
Collapse
|
42
|
Takamatsu S, Maruyama T, Katayama S, Hirose N, Naito M, Izawa K. Synthesis of 9-(2,3-dideoxy-2-fluoro-beta-D-threo-pentofuranosyl)adenine (FddA) via a purine 3'-deoxynucleoside. J Org Chem 2001; 66:7469-77. [PMID: 11681963 DOI: 10.1021/jo0158985] [Citation(s) in RCA: 15] [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: 11/30/2022]
Abstract
A synthesis of 9-(2,3-dideoxy-2-fluoro-beta-D-threo-pentofuranosyl)adenine (1, FddA) via a 6-chloro-9-(3-deoxy-beta-D-erythro-pentofuranosyl)-9H-purine (9), which was readily obtained from inosine (5), is described. Fluorination at the C2'-beta position of the purine 3'-deoxynucleoside with diethylaminosulfur trifluoride was improved by the introduction of a 6-chloro group and proceeded in moderate yield. Purine 3'-deoxynucleoside derivatives were also subjected to nucleophilic reactions with triethylamine trihydrofluoride and gave the desired fluorinated nucleoside in good yield. The safety and yield of the fluorination process were greatly improved by the use of triethylamine trihydrofluoride. The influence of the sugar ring conformation and 6-chloro group on the rate of the nucleophilic reaction against elimination are also discussed.
Collapse
Affiliation(s)
- S Takamatsu
- AminoScience Laboratories, Ajinomoto Co., Inc. 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki, Kanagawa 210-8681, Japan
| | | | | | | | | | | |
Collapse
|
43
|
Anderson K, Seneviratne AM, Izawa K, Atkinson BL, Potter HG, Rodeo SA. Augmentation of tendon healing in an intraarticular bone tunnel with use of a bone growth factor. Am J Sports Med 2001; 29:689-98. [PMID: 11734478 DOI: 10.1177/03635465010290060301] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.3] [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
We hypothesized that an exogenous bone growth factor could augment healing of a tendon graft in a bone tunnel in a rabbit anterior cruciate ligament-reconstruction model. Seventy rabbits underwent bilateral anterior cruciate ligament reconstructions with a semitendinosus tendon graft. One limb received a collagen sponge carrier vehicle containing a mixture of bone-derived proteins while the contralateral limb was treated with either no sponge or a sponge without bone-derived proteins. The reconstruction was evaluated at 2, 4, or 8 weeks with histologic, biomechanical, and magnetic resonance imaging analysis. Histologic analysis demonstrated that specimens treated with bone-derived proteins had a more consistent, dense interface tissue and closer apposition of new bone to the graft, with occasional formation of a fibrocartilaginous interface, when compared with control specimens. The treated specimens had significantly higher load-to-failure rates than did control specimens. Treatment with bone-derived proteins resulted in an average increase in tensile strength of 65%. The treated specimens were stronger than control specimens at each time point, but the difference was greatest at 8 weeks. On the basis of signal characteristics and new bone formation, magnetic resonance imaging was useful for predicting which limb was treated, the site of failure, and the limbs with higher load-to-failure values. This study demonstrates the potential for augmenting tendon healing in an intraarticular bone tunnel using an osteoinductive growth factor.
Collapse
Affiliation(s)
- K Anderson
- William Clay Ford Center for Athletic Medicine, Detroit, Michigan 48202, USA
| | | | | | | | | | | |
Collapse
|
44
|
Izawa K, Yamaguchi H, Matsuda Y, Shishido H, Settai R, Onuki Y. Angular position of nodes in the superconducting gap of quasi-2D heavy-fermion superconductor CeCoIn5. Phys Rev Lett 2001; 87:057002. [PMID: 11497799 DOI: 10.1103/physrevlett.87.057002] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2001] [Indexed: 05/23/2023]
Abstract
The thermal conductivity of the heavy-fermion superconductor CeCoIn5 has been studied in a magnetic field rotating within the 2D planes. A clear fourfold symmetry of the thermal conductivity which is characteristic of a superconducting gap with nodes along the ( +/- pi,+/- pi) directions is resolved. The thermal conductivity measurement also reveals a first-order transition at H(c2), indicating a Pauli limited superconducting state. These results indicate that the symmetry most likely belongs to d(x(2)-y(2)), implying that the anisotropic antiferromagnetic fluctuation is relevant to the superconductivity.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | | | | | | | | | | |
Collapse
|
45
|
Yoneda M, Izawa K, Wakitani S, Nakasato S, Hayashida K, Nakagawa S. Diagnostic imaging of unstable superior glenoid labral detachment: a comparison between MR arthrography and unenhanced MRI. Mod Rheumatol 2001. [DOI: 10.1007/s101650170026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
46
|
Takamatsu S, Izawa K, Maruyama T, Katayama S, Hirose N, De Clercq E. Synthesis and in vitro antiviral activity evaluation of 9-(2-azido-2,3-dideoxy-beta-D-threo-pentofuranosyl)adenine derivatives. Nucleosides Nucleotides Nucleic Acids 2001; 20:1053-7. [PMID: 11562957 DOI: 10.1081/ncn-100002490] [Citation(s) in RCA: 2] [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: 11/03/2022]
Abstract
9-(2-Azido-2,3-dideoxy-beta-D-threo-pentofuranosyl)adenine derivatives (1a-e) containing a lipophilic function at the N-6 position in the purine ring were prepared and evaluated for their antiviral activity. The compounds 1a-e turned out to be inactive as antiviral agents.
Collapse
Affiliation(s)
- S Takamatsu
- AminoScience Laboratories, Ajinomoto Co., Inc. 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki, Kanagawa 210-8681, Japan
| | | | | | | | | | | |
Collapse
|
47
|
Hibino H, Tani K, Sugiyama H, Suzuki S, Wu MS, Izawa K, Hase H, Nakazaki Y, Tanabe T, Ooi J, Izeki T, Tojo A, Saitoh I, Tanioka Y, Asano S. Haematopoietic progenitor cells from the common marmoset as targets of gene transduction by retroviral and adenoviral vectors. Eur J Haematol 2001; 66:272-80. [PMID: 11380607 DOI: 10.1034/j.1600-0609.2001.066004272.x] [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: 11/23/2022]
Abstract
To establish a new non-human primate model for human cytokine and gene therapy, we characterized lymphocytes and haematopoietic progenitor cells of the small New World monkey, the common marmoset. We first assessed the reactions of marmoset bone marrow (BM) and peripheral blood (PB) cells to mouse anti-human monoclonal antibodies (mAbs) for the purpose of isolating marmoset lymphocytes and haematopoietic progenitor cells. Both cell fractions stained with CD4 and CD8 mAbs were identified as lymphocytes by cell proliferation assay and morphological examination. Myeloid-specific mAbs such as CD14 and CD33 did not react with marmoset BM and PB cells. No available CD34 and c-kit mAbs could be used to purify the marmoset haematopoietic progenitor cells. Furthermore, we studied the in vitro transduction of the bacterial beta-galactosidase (LacZ) gene into CFU-GM derived from marmoset BM using retroviral and adenoviral vectors. The transduction efficiency was increased by using a mixed culture system consisting of marmoset BM stromal cells and retroviral producer cells. It was also possible to transduce LacZ gene into marmoset haematopoietic progenitor cells with adenoviral vectors as well as retroviral vectors. The percentage of adenovirally transduced LacZ-positive clusters was 15% at day 4 (multiplicity of infection=200), but only 1-2% at day 14. The differential use of viral vector systems is to be recommended in targeting different diseases. Our results suggested that marmoset BM progenitor cells were available to examine the transduction efficiency of various viral vectors in vitro.
Collapse
Affiliation(s)
- H Hibino
- Department of Hematology/Oncology, Institute of Medical Science, The University of Tokyo, Central Institute for Experimental Animals Laboratories Inc., Kawasaki, Kanagawa, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Izawa K, Takahashi H, Yamaguchi H, Matsuda Y, Suzuki M, Sasaki T, Fukase T, Yoshida Y, Settai R, Onuki Y. Superconducting gap structure of spin-triplet superconductor Sr2RuO4 studied by thermal conductivity. Phys Rev Lett 2001; 86:2653-2656. [PMID: 11290003 DOI: 10.1103/physrevlett.86.2653] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2000] [Indexed: 05/23/2023]
Abstract
To clarify the superconducting gap structure of the spin-triplet superconductor Sr2RuO4, the in-plane thermal conductivity has been measured as a function of relative orientations of the thermal flow, the crystal axes, and a magnetic field rotating within the 2D RuO2 planes. The in-plane variation of the thermal conductivity is incompatible with any model with line nodes vertical to the 2D planes and indicates the existence of horizontal nodes. These results place strong constraints on models that attempt to explain the mechanism of the triplet superconductivity.
Collapse
Affiliation(s)
- K Izawa
- Institute for Solid State Physics, University of Tokyo, Chiba, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Izawa K, Shibata A, Matsuda Y, Kato Y, Takeya H, Hirata K, van Der Beek CJ, Konczykowski M. Low energy quasiparticle excitation in the vortex state of borocarbide superconductor yni2b2c. Phys Rev Lett 2001; 86:1327-1330. [PMID: 11178075 DOI: 10.1103/physrevlett.86.1327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2000] [Indexed: 05/23/2023]
Abstract
We measured the heat capacity C(p) and microwave surface impedance Z(s) in the vortex state of YNi2B2C. In contrast to conventional s-wave superconductors, C(p) shows a square root[H] dependence. This square root[H] dependence persists even after the introduction of the columnar defects which change the electronic structure of the vortex core regime and destroy the regular vortex lattice. On the other hand, flux flow resistivity is nearly proportional to H. These results indicate that the vortex state of YNi2B2C is fundamentally different from the conventional s-wave counterparts, in that the delocalized quasiparticle states around the vortex core are important, similar to d-wave superconductors.
Collapse
Affiliation(s)
- K Izawa
- Institute of Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581, Japan
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Kobayashi K, Yamaguchi J, Mizoe A, Isomoto I, Koshiishi T, Izawa K, Kanematsu T. Successful treatment of bleeding due to ileal varices in a patient with hepatocellular carcinoma. Eur J Gastroenterol Hepatol 2001; 13:63-6. [PMID: 11204813 DOI: 10.1097/00042737-200101000-00012] [Citation(s) in RCA: 18] [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: 01/04/2023]
Abstract
This case report concerns a 62-year-old female who was known to have cirrhosis. An endoscopic examination showed no evidence of haemorrhaging due to either oesophageal or gastric varices. Angiographic studies demonstrated extravasation from the ileal varices. There was a prominent arterio-portal shunt in the liver, and the shunt was considered to be a contributing factor to induce portal hypertension and variceal bleeding in the ileum. Therefore, transcatheter arterial embolization was performed, but was unsuccessful. As a result, the patient underwent a laparotomy, and a dilatating ileocaecal vein and a communicating ovarian vein were selectively ligated. Following the procedure, the haemorrhaging stopped and she then recovered. The patient is doing well 21 months after surgery at the time of writing.
Collapse
Affiliation(s)
- K Kobayashi
- Department of Surgery, National Saga Hospital, Japan
| | | | | | | | | | | | | |
Collapse
|