101
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Nishino S, Watanabe N, Kuriyama N, Ogata K, Kimura T, Matsuura H, Furugen M, Koiwaya H, Ashikaga K, Shibata Y. P2739Right ventricular infarction: incidence, hemodynamics and clinical impact in the era of primary percutaneous coronary intervention. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2739] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Nishino
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - N Watanabe
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - N Kuriyama
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - K Ogata
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - T Kimura
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - H Matsuura
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - M Furugen
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - H Koiwaya
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - K Ashikaga
- Miyazaki Medical Association Hospital, Miyazaki, Japan
| | - Y Shibata
- Miyazaki Medical Association Hospital, Miyazaki, Japan
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102
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Matsuura H, Senoo A. Herpes zoster and Hutchinson's sign. QJM 2018; 111:483. [PMID: 29346660 DOI: 10.1093/qjmed/hcy011] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Matsuura
- Department of General Internal Medicine, Kurashiki Central Hospital, 1-1-1, Miwa, Kurashiki-city, Okayama 710-8602, Japan and Department of General Internal Medicine, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - A Senoo
- Department of Dermatology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
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103
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Sagawa H, Hoshino S, Yoshioka K, Ding WG, Omatsu-Kanbe M, Nakagawa M, Maruo Y, Matsuura H. Postnatal developmental changes in the sensitivity of L-type Ca 2+ channel to inhibition by verapamil in a mouse heart model. Pediatr Res 2018; 83:1207-1217. [PMID: 29554082 DOI: 10.1038/pr.2018.46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 01/29/2018] [Indexed: 11/09/2022]
Abstract
BackgroundIn the clinical setting, verapamil is contraindicated in neonates and infants, because of the perceived risk of hypotension or bradyarrhythmia. However, it remains unclear whether there is an age-dependent difference in the sensitivity of cardiac L-type Ca2+ channel current (ICa,L) to inhibition by verapamil.MethodsVentricular myocytes were enzymatically dissociated from the hearts of six different age groups (0, 7, 14, 21, 28 days, and 10-15 weeks) of mice, using a similar Langendorff-perfusion method. Whole-cell patch-clamp technique was applied to examine the sensitivity of ICa,L to inhibition, by three classes of structurally different L-type Ca2+ channel antagonists.ResultsVerapamil, nifedipine, and diltiazem concentration-dependently blocked the ventricular ICa,L in all six age groups. However, although nifedipine and diltiazem blocked ventricular ICa,L with a similar potency in all age groups, verapamil more potently blocked ventricular ICa,L in day 0, day 7, day 14, and day 21 mice, than in day 28, and 10-15-week mice.ConclusionIn a mouse heart model, ventricular ICa,L before the weaning age (~21 days of age) exhibited a higher sensitivity to inhibition by verapamil than that after the weaning age, which may explain one possible mechanism associated with the development of verapamil-induced hypotension in human neonates and infants.
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Affiliation(s)
- Hironori Sagawa
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Shinsuke Hoshino
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Kengo Yoshioka
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Masao Nakagawa
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Yoshihiro Maruo
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
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104
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Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
| | - A Senoo
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
| | - M Saito
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
| | - Y Hamanaka
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
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105
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Affiliation(s)
- H Matsuura
- Department of General Internal Medicine, Kurashiki Central Hospital, 1-1-1, Miwa, Kurashiki-City, Okayama 710-8602
- Department of General Internal Medicine, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-City, Kagawa 769-1695, Japan
| | - M Uegami
- Department of General Internal Medicine, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-City, Kagawa 769-1695, Japan
| | - N Matsuo
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-City, Kagawa 769-1695, Japan
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106
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Kumagai M, Nishikawa K, Matsuura H, Umezawa T, Matsuda F, Okino T. Antioxidants from the Brown Alga Dictyopteris undulata. Molecules 2018; 23:E1214. [PMID: 29783698 PMCID: PMC6099395 DOI: 10.3390/molecules23051214] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 03/31/2018] [Revised: 05/15/2018] [Accepted: 05/16/2018] [Indexed: 12/22/2022] Open
Abstract
An investigation of anti-oxidative compounds from the brown alga Dictyopteris undulata has led to the isolation and identification of isozonarol, isozonarone, chromazonarol, zonaroic acid and isozonaroic acid. Their structures were identified by comparison of MS and NMR spectra. Full NMR assignment and absolute configuration of isozonaroic acid are described. Isozonarol showed the most potent 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity among the compounds isolated.
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Affiliation(s)
- Momochika Kumagai
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
- Japan Food Research Laboratories, Ibaraki, Osaka 567-0085, Japan.
| | - Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
| | - Hiroshi Matsuura
- National Institute of Technology, Asahikawa College, Asahikawa 071-8142, Japan.
| | - Taiki Umezawa
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Fuyuhiko Matsuda
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
| | - Tatsufumi Okino
- Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan.
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan.
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107
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Matsuura H, Yamaji Y. Response to letter to editor from Dr O.M.P. Jolobe. QJM 2018; 111:351. [PMID: 29161438 DOI: 10.1093/qjmed/hcx212] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Matsuura
- From the Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - Y Yamaji
- From the Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
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108
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Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-City, Kagawa 769-1695, Japan
| | - H Yasuhara
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-City, Kagawa 769-1695, Japan
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109
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Ozawa J, Ohno S, Saito H, Saitoh A, Matsuura H, Horie M. A novel CACNA1C mutation identified in a patient with Timothy syndrome without syndactyly exerts both marked loss- and gain-of-function effects. HeartRhythm Case Rep 2018; 4:273-277. [PMID: 30023270 PMCID: PMC6050422 DOI: 10.1016/j.hrcr.2018.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Junichi Ozawa
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Japan.,Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Seiko Ohno
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Japan.,Center for Epidemiologic Research in Asia, Shiga University of Medical Science, Otsu, Japan
| | - Hideki Saito
- Department of Cardiology, Seirei Hamamatsu General Hospital, Hamamatsu, Japan
| | - Akihiko Saitoh
- Department of Pediatrics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Minoru Horie
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Japan
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110
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Toyoda F, Ding WG, Matsuura H. Correction to: Heterogeneous functional expression of the sustained inward Na + current in guinea pig sinoatrial node cells. Pflugers Arch 2018; 470:979. [PMID: 29480330 DOI: 10.1007/s00424-018-2129-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Dr. Wei-Guang Ding's given name and family name were inadvertently interchanged initially. The correct names are as shown above.
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Affiliation(s)
- Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan.
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan
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111
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Matsuura H, Nagasaka Y. Soret forced Rayleigh scattering instrument for simultaneous detection of two-wavelength signals to measure Soret coefficient and thermodiffusion coefficient in ternary mixtures. Rev Sci Instrum 2018; 89:024903. [PMID: 29495814 DOI: 10.1063/1.5013292] [Citation(s) in RCA: 3] [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: 11/13/2017] [Accepted: 01/15/2018] [Indexed: 06/08/2023]
Abstract
We describe an instrument for the measurement of the Soret and thermodiffusion coefficients in ternary systems based on the transient holographic grating technique, which is called Soret forced Rayleigh scattering (SFRS) or thermal diffusion forced Rayleigh scattering (TDFRS). We integrated the SFRS technique and the two-wavelength detection technique, which enabled us to obtain two different signals to determine the two independent Soret coefficients and thermodiffusion coefficients in ternary systems. The instrument has been designed to read the mass transport simultaneously by two-wavelength lasers with wavelengths of λ = 403 nm and λ = 639 nm. The irradiation time of the probing lasers is controlled to reduce the effect of laser absorption to the sample with dye (quinizarin), which is added to convert the interference pattern of the heating laser of λ = 532 nm to the temperature grating. The result of the measurement of binary benchmark mixtures composed of 1,2,3,4-tetrahydronaphthalene (THN), isobutylbenzene (IBB), and n-dodecane (nC12) shows that the simultaneous two-wavelength observation of the Soret effect and the mass diffusion are adequately performed. To evaluate performance in the measurement of ternary systems, we carried out experiments on the ternary benchmark mixtures of THN/IBB/nC12 with the mass fractions of 0.800/0.100/0.100 at a temperature of 298.2 K. The Soret coefficient and thermodiffusion coefficient agreed with the ternary benchmark values within the range of the standard uncertainties (23% for the Soret coefficient of THN and 30% for the thermodiffusion coefficient of THN).
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Affiliation(s)
- H Matsuura
- School of Integrated Design Engineering, Keio University, 3-14-1, Hiyoshi, 223-8522 Yokohama, Japan
| | - Y Nagasaka
- Department of System Design Engineering, Keio University, 3-14-1, Hiyoshi, 223-8522 Yokohama, Japan
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112
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Affiliation(s)
- H Matsuura
- Department of GIM, Mitoyo, General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - Y Yamaji
- Department of Respiratory Medicine, Yamaji Respiratory Medicine Clinic, 4112-1, Oonohara, Oonohara-cho, Kanonji-city, Kagawa 769-1611, Japan
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113
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Affiliation(s)
- H Matsuura
- Department of GIM, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa, 769-1695, Japan
| | - T Nakamura
- Department of Diagnostic Radiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa, 769-1695 Japan
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114
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Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - A Imagawa
- Imagawa Medical clinic, Gastroenterology, 285-3, Takeda, Kasada, Toyonaka-cho, Mitoyo-city, Kagawa 769-1503, Japan
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115
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Okamura S, Kawaminami T, Matsuura H, Fusetani N, Goshima S. Correction to: Behavioral assay and chemical characters of female sex pheromones in the hermit crab Pagurus filholi. J ETHOL 2018; 36:213. [PMID: 31305604 PMCID: PMC5924660 DOI: 10.1007/s10164-017-0535-7] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Saori Okamura
- 1Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Takuma Kawaminami
- 1Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Hiroshi Matsuura
- 1Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Nobuhiro Fusetani
- 2Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Seiji Goshima
- 3Division of Marine Resource and Environmental Science, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan.,4Present Address: Fisheries Science Center, Hokkaido University Museum, Hakodate, Hokkaido 041-8611 Japan
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116
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Okamura S, Kawaminami T, Matsuura H, Fusetani N, Goshima S. Behavioral assay and chemical characters of female sex pheromones in the hermit crab Pagurus filholi. J ETHOL 2017; 35:169-176. [PMID: 29225402 PMCID: PMC5711989 DOI: 10.1007/s10164-017-0507-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/10/2017] [Indexed: 11/18/2022]
Abstract
Males of the hermit crab Pagurus filholi perform assessment behavior toward females, as a preliminary step of precopulatory guarding, during the reproductive season. It is known that such behavior is elicited by female sex pheromones, but the compounds involved have never been characterized in this species. Several experiments were conducted to develop a reliable bioassay along with purification procedures to identify potential compounds with pheromonal activity in Pagurus filholi. We developed a bioassay protocol to assess pheromonal activity by using an empty shell with cotton containing either artificial seawater (control) or test water. We measured and compared the time duration of male assessment behavior toward each shell if the test water contained female sex pheromones. Ultra-filtering of seawater samples potentially containing pheromones showed that the compound was <1 kDa in molecular weight. Males showed precopulatory assessment behavior toward “female conditioned” water samples treated with open column purification and eluted with MeOH, suggesting that compounds triggering male behavior were low polar molecules. Molecules with pheromonal activity were not volatile after freeze drying, effective even after heating to 90 °C, and remained active in seawater at 12 °C even after 6 days from sample collection, which suggests a rather stable characteristic of the female sex pheromones of this species.
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Affiliation(s)
- Saori Okamura
- Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Takuma Kawaminami
- Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Hiroshi Matsuura
- Laboratory of Marine Biology, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Nobuhiro Fusetani
- Division of Marine Life Science, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan
| | - Seiji Goshima
- Division of Marine Resource and Environmental Science, Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611 Japan.,Present Address: Fisheries Science Center, Hokkaido University Museum, Hakodate, Hokkaido 041-8611 Japan
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117
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Toyoda F, Ding WG, Matsuura H. Heterogeneous functional expression of the sustained inward Na + current in guinea pig sinoatrial node cells. Pflugers Arch 2017; 470:481-490. [PMID: 29197941 DOI: 10.1007/s00424-017-2091-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 11/08/2017] [Accepted: 11/21/2017] [Indexed: 11/26/2022]
Abstract
The sustained inward Na+ current (I st) identified in the sinoatrial node (SAN) cell has been suggested to play a pivotal role in cardiac pacemaking. However, the composition of cells in the SAN is heterogeneous and cell-to-cell variability in the magnitude of I st remains to be fully characterized. The present study investigated the current density of I st in morphologically different types of pacemaker cells dissociated from guinea pig SAN. I st was preferentially detected in spontaneously active spindle or spider-shaped cells, but was less well expressed in larger-sized elongated spindle-type cells and practically absent in clearly striated atrial-like cells, despite clear expression of the funny current (I f). The current density of I st in spindle and spider cells varied from 0.7 to 1.6 pA pF-1 and was significantly reduced in non-beating cells with similar morphologies. By linear regression analysis, we identified a positive correlation between the current densities of I st and the L-type Ca2+ current (I Ca,L), which was specifically observed in spindle and spider cells. These cells exhibited a more negative voltage for half maximal I Ca,L activation than atrial-like cells, suggesting a variable ratio between CaV1.2- and CaV1.3-mediated I Ca,L in SAN cells. Consistent single-cell transcript measurements confirmed a higher relative expression of CaV1.3, which activates at more negative potentials, in spindle cells than in atrial-like cells. Taken together, these results can be interpreted as indicating that I st plays a specific role in primary pacemaker cells and that its presence is closely correlated with functional levels of CaV1.3-mediated I Ca,L.
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Affiliation(s)
- Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan.
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Seta Tsukinowa, Otsu, Shiga, 520-2192, Japan
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118
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Matsuura H, Yasuhara H. Crohn's disease: bamboo joint-like appearance. QJM 2017; 110:845. [PMID: 29025009 DOI: 10.1093/qjmed/hcx169] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Matsuura
- Gastroenterology Outpatients Department, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - H Yasuhara
- Gastroenterology Outpatients Department, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
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119
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Fukumoto D, Ding WG, Wada Y, Fujii Y, Ichikawa M, Takayama K, Fukuyama M, Kato K, Itoh H, Makiyama T, Omatsu-Kanbe M, Matsuura H, Horie M, Ohno S. Novel intracellular transport-refractory mutations in KCNH2 identified in patients with symptomatic long QT syndrome. J Cardiol 2017; 71:401-408. [PMID: 29146210 DOI: 10.1016/j.jjcc.2017.10.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 09/29/2017] [Accepted: 10/10/2017] [Indexed: 01/30/2023]
Abstract
BACKGROUND Missense mutations in KCNH2, a gene encoding the Kv11.1 channel, cause long QT syndrome (LQTS) type 2 primarily by disrupting the intracellular transport of Kv11.1 to the plasma membrane. The present study aimed to clarify the functional changes by two novel KCNH2 missense mutations. METHODS We performed genetic screening of three unrelated symptomatic LQTS probands with family histories of cardiac symptoms. Chinese hamster ovary cells were transfected with wild-type (WT) and/or mutant KCNH2 plasmid and examined by patch-clamp technique. Immunostaining and confocal microscopy were performed to evaluate the intracellular localization of WT and homozygous mutant Kv11.1 in human embryonic kidney cells. For the study of trafficking rescue, we used low-temperature incubation (30°C). We also examined pharmacological rescue of homozygous mutant Kv11.1 current in cells treated with E-4031 or dofetilide. RESULTS We identified two novel KCNH2 missense mutations, G785D and T826I. Electrophysiological study showed that both mutant channels were nonfunctional in homozygous condition and reduced current densities by half in heterozygous condition compared with WT Kv11.1. Heterozygous Kv11.1-G785D produced a significant positive shift in activation and a significant negative shift in inactivation, whereas heterozygous Kv11.1-T826I caused no kinetic changes. Immunostaining revealed that both were transport-refractory mutations. Incubation at 30°C rescued plasma membrane expression of Kv11.1-T826I but not G785D. We confirmed low-temperature-induced restoration of homozygous Kv11.1-T826I transport by functional current measurements. In contrast, incubation with E-4031 or dofetilide failed to produce measurable currents in both homozygous mutant channels. CONCLUSIONS Two novel KCNH2 mutations disrupted the intracellular transport of Kv11.1. Low-temperature incubation rescued plasma membrane expression of Kv11.1-T826I but not G785D. Both mutations exerted loss-of-function effects on Kv11.1 and explained the phenotypes of the mutation carriers.
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Affiliation(s)
- Daisuke Fukumoto
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Wei-Guang Ding
- Department of Physiology, Division of Cell Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Yuko Wada
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Yusuke Fujii
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Mari Ichikawa
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Koichiro Takayama
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Megumi Fukuyama
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Koichi Kato
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hideki Itoh
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Takeru Makiyama
- Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Division of Cell Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Division of Cell Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Minoru Horie
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Seiko Ohno
- Department of Cardiovascular and Respiratory Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan; Center for Epidemiologic Research in Asia, Shiga University of Medical Science, Otsu, Shiga, Japan.
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Affiliation(s)
- H Matsuura
- Department of GIM, Mitoyo General Hospital, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan; H. Jinno, Department of Gastroenterology, Mitoyo General Hospital, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
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121
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Matsuura H, Shimanouchi Y. Steeple sign and acute laryngotracheobronchitis. QJM 2017; 110:767. [PMID: 29025139 DOI: 10.1093/qjmed/hcx156] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Matsuura
- Department of Pediatrics, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa, 769-1695 Japan
| | - Y Shimanouchi
- Department of GIM, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa, 769-1695 Japan
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122
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Affiliation(s)
- H Matsuura
- Department of Dermatology, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695
| | - A Senoo
- Department of GIM, Mitoyo General Hospital, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
| | - M Saitou
- Department of GIM, Mitoyo General Hospital, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
| | - Y Hamanaka
- Department of GIM, Mitoyo General Hospital, 708 Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
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123
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Sabirov RZ, Merzlyak PG, Okada T, Islam MR, Uramoto H, Mori T, Makino Y, Matsuura H, Xie Y, Okada Y. The organic anion transporter SLCO2A1 constitutes the core component of the Maxi-Cl channel. EMBO J 2017; 36:3309-3324. [PMID: 29046334 DOI: 10.15252/embj.201796685] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 09/08/2017] [Accepted: 09/12/2017] [Indexed: 11/09/2022] Open
Abstract
The maxi-anion channels (MACs) are expressed in cells from mammals to amphibians with ~60% exhibiting a phenotype called Maxi-Cl. Maxi-Cl serves as the most efficient pathway for regulated fluxes of inorganic and organic anions including ATP However, its molecular entity has long been elusive. By subjecting proteins isolated from bleb membranes rich in Maxi-Cl activity to LC-MS/MS combined with targeted siRNA screening, CRISPR/Cas9-mediated knockout, and heterologous overexpression, we identified the organic anion transporter SLCO2A1, known as a prostaglandin transporter (PGT), as a key component of Maxi-Cl. Recombinant SLCO2A1 exhibited Maxi-Cl activity in reconstituted proteoliposomes. When SLCO2A1, but not its two disease-causing mutants, was heterologously expressed in cells which lack endogenous SLCO2A1 expression and Maxi-Cl activity, Maxi-Cl currents became activated. The charge-neutralized mutant became weakly cation-selective with exhibiting a smaller single-channel conductance. Slco2a1 silencing in vitro and in vivo, respectively, suppressed the release of ATP from swollen C127 cells and from Langendorff-perfused mouse hearts subjected to ischemia-reperfusion. These findings indicate that SLCO2A1 is an essential core component of the ATP-conductive Maxi-Cl channel.
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Affiliation(s)
- Ravshan Z Sabirov
- International Collaborative Research Project, National Institute for Physiological Sciences, Okazaki, Japan.,Laboratory of Molecular Physiology, Institute of Bioorganic Chemistry, Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
| | - Petr G Merzlyak
- International Collaborative Research Project, National Institute for Physiological Sciences, Okazaki, Japan.,Laboratory of Molecular Physiology, Institute of Bioorganic Chemistry, Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
| | - Toshiaki Okada
- International Collaborative Research Project, National Institute for Physiological Sciences, Okazaki, Japan.,Division of Cell Signaling, National Institute for Physiological Sciences, Okazaki, Japan
| | - Md Rafiqul Islam
- International Collaborative Research Project, National Institute for Physiological Sciences, Okazaki, Japan
| | - Hiromi Uramoto
- Department of Health and Nutrition, Jin-ai University, Echizen, Japan
| | - Tomoko Mori
- Core Research Facilities, National Institute for Basic Biology, Okazaki, Japan
| | - Yumiko Makino
- Core Research Facilities, National Institute for Basic Biology, Okazaki, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Yu Xie
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Yasunobu Okada
- International Collaborative Research Project, National Institute for Physiological Sciences, Okazaki, Japan .,Department of Physiology, Kyoto Prefectural University of Medicine, Kyoto, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa, Japan
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124
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Matsuura H, Itogawa M, Hasegawa Y, Ishizu T. Lindsay's nail. QJM 2017; 110:681. [PMID: 29087527 DOI: 10.1093/qjmed/hcx127] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa, 769-1695, Japan
| | - M Itogawa
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa, 769-1695, Japan
| | - Y Hasegawa
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa, 769-1695, Japan
| | - T Ishizu
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa, 769-1695, Japan
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125
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Affiliation(s)
- H Matsuura
- GIM, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
| | - M Nakatsu
- GIM, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji, Kagawa 769-1695, Japan
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126
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Nagasumi S, Matsuura H, Katayama K, Otsuka T, Goto M, Nakagawa S. Study on Tritium Production Using a High-Temperature Gas-Cooled Reactor for Fusion Reactors: Evaluation of Tritium Outflow by Non-Equilibrium Diffusion Simulations. Fusion Science and Technology 2017. [DOI: 10.1080/15361055.2017.1352424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- S. Nagasumi
- Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, 744 Motooka, Fukuoka 819-0395, Japan
| | - H. Matsuura
- Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, 744 Motooka, Fukuoka 819-0395, Japan
| | - K. Katayama
- Kyushu University, Department of Advanced Energy Engineering Science, Kasuga, Japan
| | - T. Otsuka
- Kindai University, Department of Electrical and Electronic Engineering, Higashi Osaka, Japan
| | - M. Goto
- Japan Atomic Energy Agency, 4002 Oarai, Ibaraki 311-1393, Japan
| | - S. Nakagawa
- Japan Atomic Energy Agency, 4002 Oarai, Ibaraki 311-1393, Japan
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127
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Matsuura H, Senoo A, Saito M, Hamanaka Y. Green nail syndrome. QJM 2017; 110:609. [PMID: 28911027 DOI: 10.1093/qjmed/hcx114] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- H Matsuura
- Department of GIM, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - A Senoo
- Department of Dermatology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - M Saito
- Department of Dermatology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - Y Hamanaka
- Department of Dermatology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
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128
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Nakashima Y, Sakamoto M, Takeda H, Ichimura K, Hosoi K, Oki K, Yoshikawa M, Nishino N, Matsuura H, Hirata M, Ichimura M, Kariya T, Katanuma I, Kohagura J, Minami R, Numakura T, Ikezoe R, Akabane Y, Kigure S, Nagatsuka Y, Takahashi S, Ueda H, Imai T. First Results and Future Research Plan of Divertor Simulation Experiments Using D-Module in the End-Cell of the GAMMA 10/PDX Tandem Mirror. Fusion Science and Technology 2017. [DOI: 10.13182/fst13-a16881] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Nakashima
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - M. Sakamoto
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - H. Takeda
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - K. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - K. Hosoi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - K. Oki
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - M. Yoshikawa
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - N. Nishino
- Graduate school of Engineering, Hiroshima University, Hiroshima 739-8527, Japan
| | - H. Matsuura
- Radiation Research Center, Osaka Prefecture University, Osaka 599-8570, Japan
| | - M. Hirata
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - M. Ichimura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - T. Kariya
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - I. Katanuma
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - J. Kohagura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - R. Minami
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - T. Numakura
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - R. Ikezoe
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - Y. Akabane
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - S. Kigure
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - Y. Nagatsuka
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - S. Takahashi
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - H. Ueda
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
| | - T. Imai
- Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 3005-8577, Japan
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129
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Kurihara K, Kado S, Matsuura H, Shikama T, Iida Y, Chung KS, Tanaka S. Development of a Thermal Probe Method for Heat Flux and Ion Temperature Measurement in the Divertor Simulator MAP-II. Fusion Science and Technology 2017. [DOI: 10.13182/fst07-a1365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- K. Kurihara
- School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - S. Kado
- High Temperature Plasma Center, The University of Tokyo, Japan
| | - H. Matsuura
- Graduate School of Engineering, Osaka Prefecture University, Japan
| | - T. Shikama
- School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - Y. Iida
- School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
| | - K.-S. Chung
- High Temperature Plasma Center, The University of Tokyo, Japan
| | - S. Tanaka
- School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
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130
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Matsuura H, Yasumoto T, Kouchi S, Nakaya H, Shimakawa S, Nakao Y, Goto M, Nakagawa S, Nishikawa M. Study of Tritium Production for Fusion Reactors Using High-Temperature Gas-Cooled Reactors. Fusion Science and Technology 2017. [DOI: 10.13182/fst12-a13431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Matsuura
- Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - T. Yasumoto
- Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - S. Kouchi
- Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - H. Nakaya
- Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - S. Shimakawa
- Japan Atomic Energy Agency, 4002 Oarai, Ibaraki 319-1393, Japan
| | - Y. Nakao
- Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan
| | - M. Goto
- Japan Atomic Energy Agency, 4002 Oarai, Ibaraki 319-1393, Japan
| | - S. Nakagawa
- Japan Atomic Energy Agency, 4002 Oarai, Ibaraki 319-1393, Japan
| | - M. Nishikawa
- Graduate School of Engineering Science, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan
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131
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Koiwaya H, Watanabe N, Ashikaga K, Nishino S, Ogata K, Nakama T, Matsuura H, Furugen M, Kuriyama N, Shibata Y. P4301Which should we choose as the anticoagulants for atrial fibrillation patients with coronary stenting? Warfarin vs. non-vitamin K-antagonist oral anticoagulants. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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132
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Fukumoto D, Ohno S, Wada Y, Fujii Y, Ichikawa M, Takayama K, Fukuyama M, Makiyama T, Itoh H, Ding W, Matsuura H, Horie M. 972Novel intracellular transport-refractory mutations in KCNH2 identified in symptomatic long QT syndrome patients. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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133
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Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
| | - Y Yamaji
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji City, Kagawa 769-1695, Japan
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134
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Koiwaya H, Watanabe N, Kuriyama N, Nishino S, Ogata K, Nakama T, Matsuura H, Furugen M, Shibata Y. P2072Independent predictors of the recurrent restenosis after paclitaxel-coated balloon angioplasty for in-stent restenosis. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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135
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Affiliation(s)
- H Matsuura
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - A Takaishi
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - N Oonishi
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - Y Nakano
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - K Kagawa
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - N Matsuo
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - T Yamaji
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - Y Kato
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
| | - K Hayashi
- Department of Cardiology, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan
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136
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Fujii Y, Matsumoto Y, Hayashi K, Ding WG, Tomita Y, Fukumoto D, Wada Y, Ichikawa M, Sonoda K, Ozawa J, Makiyama T, Ohno S, Yamagishi M, Matsuura H, Horie M, Itoh H. Contribution of a KCNH2 variant in genotyped long QT syndrome: Romano–Ward syndrome under double mutations and acquired long QT syndrome under heterozygote. J Cardiol 2017; 70:74-79. [DOI: 10.1016/j.jjcc.2016.09.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/09/2016] [Accepted: 09/23/2016] [Indexed: 01/08/2023]
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137
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Matsuura H, Moritou Y, Kinoshita T, Asano Y, Mashima S, Hayashi K. Diospyrobezoar and a fondness for persimmons. QJM 2017; 110:401-402. [PMID: 28339942 DOI: 10.1093/qjmed/hcx039] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
| | - Y Moritou
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
| | - T Kinoshita
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
| | - Y Asano
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
| | - S Mashima
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
| | - K Hayashi
- Mitoyo General Hospital, 708, Himehama, Toyohama-Cho, Kanonji City, Kagawa 769-1695, Japan.
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138
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Affiliation(s)
- H Matsuura
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan.
| | - A Senoo
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan.
| | - M Saito
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan.
| | - Y Hamanaka
- Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa 769-1695, Japan.
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139
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Nakao Y, Senmyo N, Nakamura N, Matsuura H, Johzaki T, Voronchev VT. On the Possibility of Electron Degeneracy Diagnostics in Laser-Imploded DT Fuel for Fast Ignition. Fusion Science and Technology 2017. [DOI: 10.13182/fst09-a8932] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Nakao
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;
| | - N. Senmyo
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;
| | - N. Nakamura
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;
| | - H. Matsuura
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;
| | - T. Johzaki
- Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - V. T. Voronchev
- Institute of Nuclear Physics, Moscow State University, Moscow 119991, Russia
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140
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141
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Matsuura H, Moritou Y. Gastric anisakiasis. QJM 2017; 110:251. [PMID: 28062739 DOI: 10.1093/qjmed/hcx009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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142
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Omatsu-Kanbe M, Nozuchi N, Nishino Y, Mukaisho KI, Sugihara H, Matsuura H. Identification of cardiac progenitors that survive in the ischemic human heart after ventricular myocyte death. Sci Rep 2017; 7:41318. [PMID: 28120944 PMCID: PMC5264617 DOI: 10.1038/srep41318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 12/19/2016] [Indexed: 12/21/2022] Open
Abstract
Atypically-shaped cardiomyocytes (ACMs) are beating heart cells identified in the cultures of cardiomyocyte-removed fractions obtained from adult mouse hearts. Since ACMs spontaneously develop into beating cells in the absence of hormones or chemicals, these cells are likely to be a type of cardiac progenitors rather than stem cells. “Native ACMs” are found as small interstitial cells among ventricular myocytes that co-express cellular prion protein (PrP) and cardiac troponin T (cTnT) in mouse and human heart tissues. However, the endogenous behavior of human ACMs is unclear. In the present study, we demonstrate that PrP+ cTnT+ cells are present in the human heart tissue with myocardial infarction (MI). These cells were mainly found in the border of necrotic cardiomyocytes caused by infarcts and also in the hibernating myocardium subjected to the chronic ischemia. The ratio of PrP+ cTnT+ cells to the total cells observed in the normal heart tissue section of mouse and human was estimated to range from 0.3–0.8%. Notably, living human PrP+ cTnT+ cells were identified in the cultures obtained at pathological autopsy despite exposure to lethal ischemic conditions for hours after death. These findings suggest that ACMs could survive in the ischemic human heart and develop into a sub-population of cardiac myocytes.
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Affiliation(s)
- Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Nozomi Nozuchi
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Yuka Nishino
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Ken-Ichi Mukaisho
- Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Hiroyuki Sugihara
- Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
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143
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Ushida H, Katayama K, Matsuura H, Yamamoto R, Fukada S, Goto M, Nakagawa S. Tritium permeation behavior through pyrolytic carbon in tritium production using high-temperature gas-cooled reactor for fusion reactors. Nuclear Materials and Energy 2016. [DOI: 10.1016/j.nme.2016.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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144
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Wang S, Ding WG, Bai JY, Toyoda F, Wei MJ, Matsuura H. Regulation of human cardiac Kv1.5 channels by extracellular acidification. Pflugers Arch 2016; 468:1885-1894. [PMID: 27796577 DOI: 10.1007/s00424-016-1890-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 09/15/2016] [Accepted: 09/30/2016] [Indexed: 10/20/2022]
Abstract
Human Kv1.5 channels (hKv1.5) conduct the ultra-rapid delayed rectifier potassium current (I Kur), which plays an important role in action potential repolarization of atrial myocytes. The present study was undertaken to examine the effects of acidic pH on hKv1.5 wild-type (WT) and its pore mutant channels heterologously expressed in Chinese hamster ovary (CHO) cells using site-directed mutagenesis combined with whole-cell patch-clamp technique. Both extracellular and intracellular acidifications equally and reversely reduced the amplitude of hKv1.5 currents. The extracellular acidification significantly shifted the voltage dependence of current activation to more depolarized potentials and accelerated deactivation kinetics of the current. The ancillary β subunits Kvβ1.3 and Kvβ1.2, known to modify the pharmacological sensitivities of hKv1.5, enhanced the extracellular proton-induced inhibitory effect on hKv1.5 current. In addition, several mutants (T462C, T479A, T480A, and I508A) exhibited significantly higher sensitivity to acidic pH-induced inhibition compared with WT channel, whereas the inhibitory effect of acidic pH was markedly reduced in H463G mutant. These observations indicate that (1) extracellular acidification modifies hKv1.5 gating and activity, (2) β subunits and several residues (T462, T479, T480, and I508) play critical roles in determining the sensitivity of the channel to acidic exposure, and (3) H463 may be a critical sensor for the channel inhibition by extracellular protons.
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Affiliation(s)
- Shuang Wang
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan.,Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Jia-Yu Bai
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan
| | - Min-Jie Wei
- Department of Pharmacology, School of Pharmacy, China Medical University, Shenyang, China.
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, 520-2192, Japan.
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145
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Kumagai K, Toyoda F, Staunton C, Maeda T, Okumura N, Matsuura H, Matsusue Y, Imai S, Barrett-Jolley R. Activation of a chondrocyte volume-sensitive Cl(-) conductance prior to macroscopic cartilage lesion formation in the rabbit knee anterior cruciate ligament transection osteoarthritis model. Osteoarthritis Cartilage 2016; 24:1786-1794. [PMID: 27266646 PMCID: PMC5756537 DOI: 10.1016/j.joca.2016.05.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/29/2016] [Accepted: 05/25/2016] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The anterior cruciate ligament transection (ACLT) rabbit osteoarthritis (OA) model confers permanent knee instability and induces joint degeneration. The degeneration process is complex, but includes chondrocyte apoptosis and OA-like loss of cartilage integrity. Previously, we reported that activation of a volume-sensitive Cl(-) current (ICl,vol) can mediate cell shrinkage and apoptosis in rabbit articular chondrocytes. Our objective was therefore to investigate whether ICl,vol was activated in the early stages of the rabbit ACLT OA model. DESIGN Adult Rabbits underwent unilateral ACLT and contralateral arthrotomy (sham) surgery. Rabbits were euthanized at 2 or 4 weeks. Samples were analyzed histologically and with assays of cell volume, apoptosis and electrophysiological characterization of ICl,vol. RESULTS At 2 and 4 weeks post ACLT cartilage appeared histologically normal, nevertheless cell swelling and caspase 3/7 activity were both significantly increased compared to sham controls. In cell-volume experiments, exposure of chondrocytes to hypotonic solution led to a greater increase in cell size in ACLT compared to controls. Caspase-3/7 activity, an indicator of apoptosis, was elevated in both ACLT 2wk and 4wk. Whole-cell currents were recorded with patch clamp of chondrocytes in iso-osmotic and hypo-osmotic external solutions under conditions where Na(+), K(+) and Ca(2+) currents were minimized. ACLT treatment resulted in a large increase in hypotonic-activated chloride conductance. CONCLUSION Changes in chondrocyte ion channels take place prior to the onset of apparent cartilage loss in the ACLT rabbit model of OA. Further studies are needed to investigate if pharmacological inhibition of ICl,vol decreases progression of OA in animal models.
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Affiliation(s)
- K. Kumagai
- Department of Musculoskeletal Biology, Institute of Aging and Chronic Disease, University of Liverpool, UK,Department of Orthopedic Surgery, Shiga University of Medical Science, Japan
| | - F. Toyoda
- Department of Physiology, Shiga University of Medical Science, Japan
| | - C.A. Staunton
- Department of Musculoskeletal Biology, Institute of Aging and Chronic Disease, University of Liverpool, UK
| | - T. Maeda
- Department of Orthopedic Surgery, Shiga University of Medical Science, Japan
| | - N. Okumura
- Department of Orthopedic Surgery, Shiga University of Medical Science, Japan
| | - H. Matsuura
- Department of Physiology, Shiga University of Medical Science, Japan
| | - Y. Matsusue
- Department of Orthopedic Surgery, Shiga University of Medical Science, Japan
| | - S. Imai
- Department of Orthopedic Surgery, Shiga University of Medical Science, Japan
| | - R. Barrett-Jolley
- Department of Musculoskeletal Biology, Institute of Aging and Chronic Disease, University of Liverpool, UK,Address correspondence and reprint requests to: R. Barrett-Jolley, Department of Musculoskeletal Biology, Institute of Aging and Chronic Disease, University of Liverpool, UK.Department of Musculoskeletal BiologyInstitute of Aging and Chronic DiseaseUniversity of LiverpoolUK
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146
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Kuré K, Matsuura H, Imagawa T, Nitta Y. Experimentelle und pathologische Studien über die progressive Muskelatrophie. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/bf02622794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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147
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Odagiri K, Fujiwara T, Andoh K, Kinno Y, Matsuura H, Tsukuda M. Single Exposure Dual-Energy Subtraction Radiography of the Upper Airways Using Computed Radiography. Acta Radiol 2016. [DOI: 10.1177/028418519203300320] [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: 11/16/2022]
Affiliation(s)
- K. Odagiri
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
| | - T. Fujiwara
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
| | - K. Andoh
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
| | - Y. Kinno
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
| | - H. Matsuura
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
| | - M. Tsukuda
- Departments of Diagnostic Radiology and Head and Neck Surgery, Kanagawa Cancer Center, Yokohama City, Japan
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148
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Kojima A, Bai JY, Ito Y, Ding WG, Kitagawa H, Matsuura H. Serum albumin attenuates the open-channel blocking effects of propofol on the human Kv1.5 channel. Eur J Pharmacol 2016; 783:117-26. [DOI: 10.1016/j.ejphar.2016.04.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/26/2016] [Accepted: 04/28/2016] [Indexed: 11/29/2022]
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149
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Maeda T, Toyoda F, Imai S, Tanigawa H, Kumagai K, Matsuura H, Matsusue Y. Lidocaine induces ROCK-dependent membrane blebbing and subsequent cell death in rabbit articular chondrocytes. J Orthop Res 2016; 34:754-62. [PMID: 26519731 DOI: 10.1002/jor.23092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 10/22/2015] [Indexed: 02/04/2023]
Abstract
Local anesthetics are administered intraarticularly for pain control in orthopedic clinics and surgeries. Although previous studies have shown that local anesthetics can be toxic to chondrocytes, the underlying cellular mechanisms remain unclear. The present study investigates acute cellular responses associated with lidocaine-induced toxicity to articular chondrocytes. Rabbit articular chondrocytes were exposed to lidocaine and their morphological changes were monitored with live cell microscopy. The viability of chondrocytes was evaluated using a fluorescence based LIVE/DEAD assay. Acute treatment of chondrocytes with lidocaine (3-30 mM) induced spherical protrusions on the cell surface (so called "membrane blebbing") in a time- and concentration-dependent manner. The concentration-response relationship for the lidocaine effect was shifted leftward by elevating extracellular pH, as expected for the non-ionized lidocaine being involved in the bleb formation. ROCK (Rho-kinase) inhibitors Y-27632 and fasudil completely prevented the lidocaine-induced membrane blebbing, suggesting that ROCK activation is required for bleb formation. Caspase-3 levels were unchanged by 10 mM lidocaine (p = 0.325) and a caspase inhibitor z-VAD-fmk did not affect the lidocaine-induced blebbing (p = 0.964). GTP-RhoA levels were significantly increased (p < 0.001), but Rho inhibitor-1 failed to suppress the membrane blebbing (p = 0.875). Lidocaine (30 mM) reduced the cell viability of isolated chondrocytes (p < 0.001) and in situ chondrocytes (p < 0.001). The chondrotoxicity was attenuated by pretreatment of cells with ROCK inhibitors or a myosin-II inhibitor blebbistatin (p < 0.001). These findings suggest that lidocaine induces ROCK-dependent membrane blebbing and thereby produces a cytotoxic effect on chondrocytes. © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:754-762, 2016.
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Affiliation(s)
- Tsutomu Maeda
- Department of Orthopedic Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan.,Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Futoshi Toyoda
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Shinji Imai
- Department of Orthopedic Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hitoshi Tanigawa
- Department of Orthopedic Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan.,Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Kousuke Kumagai
- Department of Orthopedic Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Yoshitaka Matsusue
- Department of Orthopedic Surgery, Shiga University of Medical Science, Otsu, Shiga, Japan
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150
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Sadanaga N, Morinaga K, Matsuura H. Secondary reconstruction with a transverse colon covered with a pectoralis major muscle flap and split thickness skin grafts for an esophageal defect and wide skin defects of the anterior chest wall. Surg Case Rep 2016; 1:22. [PMID: 26943390 PMCID: PMC4747962 DOI: 10.1186/s40792-015-0020-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 01/14/2015] [Indexed: 11/12/2022] Open
Abstract
Necrosis of a reconstructed organ after esophagectomy is a rare postoperative complication. However, in case this complication develops, severe infectious complications can occur, and subsequent surgical reconstruction is quite complicated. To treat esophageal conduit necrosis after esophageal reconstruction with the terminal ileum and ascending colon, we reconstructed the esophagus using a transverse colon, which was covered with a pectoralis major muscle flap to reinforce the anastomotic site. In addition, split thickness skin grafts were applied to the wide skin defect to cover the reconstructed organs at the antesternal route. Widely extended split thickness skin grafts can adhere to the reconstructed organs without excessive tension. Therefore, this method enabled successful treatment of an esophageal defect and wide skin defects of the anterior chest wall.
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Affiliation(s)
- Noriaki Sadanaga
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.
| | - Keigo Morinaga
- Department of Plastic Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.
| | - Hiroshi Matsuura
- Department of Surgery, Saiseikai Fukuoka General Hospital, 1-3-46 Tenjin, Chuo-ku, Fukuoka, 810-0001, Japan.
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