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Zhang J, Shen S, Puggioni D, Wang M, Sha H, Xu X, Lyu Y, Peng H, Xing W, Walters LN, Liu L, Wang Y, Hou D, Xi C, Pi L, Ishizuka H, Kotani Y, Kimata M, Nojiri H, Nakamura T, Liang T, Yi D, Nan T, Zang J, Sheng Z, He Q, Zhou S, Nagaosa N, Nan CW, Tokura Y, Yu R, Rondinelli JM, Yu P. A correlated ferromagnetic polar metal by design. Nat Mater 2024:10.1038/s41563-024-01856-6. [PMID: 38605196 DOI: 10.1038/s41563-024-01856-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 03/11/2024] [Indexed: 04/13/2024]
Abstract
Polar metals have recently garnered increasing interest because of their promising functionalities. Here we report the experimental realization of an intrinsic coexisting ferromagnetism, polar distortion and metallicity in quasi-two-dimensional Ca3Co3O8. This material crystallizes with alternating stacking of oxygen tetrahedral CoO4 monolayers and octahedral CoO6 bilayers. The ferromagnetic metallic state is confined within the quasi-two-dimensional CoO6 layers, and the broken inversion symmetry arises simultaneously from the Co displacements. The breaking of both spatial-inversion and time-reversal symmetries, along with their strong coupling, gives rise to an intrinsic magnetochiral anisotropy with exotic magnetic field-free non-reciprocal electrical resistivity. An extraordinarily robust topological Hall effect persists over a broad temperature-magnetic field phase space, arising from dipole-induced Rashba spin-orbit coupling. Our work not only provides a rich platform to explore the coupling between polarity and magnetism in a metallic system, with extensive potential applications, but also defines a novel design strategy to access exotic correlated electronic states.
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Affiliation(s)
- Jianbing Zhang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - Shengchun Shen
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - Danilo Puggioni
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Meng Wang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - Haozhi Sha
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
- MOE Key Laboratory of Advanced Materials, Tsinghua University, Beijing, China
| | - Xueli Xu
- High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Yingjie Lyu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - Huining Peng
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - Wandong Xing
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
- MOE Key Laboratory of Advanced Materials, Tsinghua University, Beijing, China
| | - Lauren N Walters
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Linhan Liu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
- MOE Key Laboratory of Advanced Materials, Tsinghua University, Beijing, China
| | - Yujia Wang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
| | - De Hou
- High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Chuanying Xi
- High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Li Pi
- High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Hiroaki Ishizuka
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
| | - Yoshinori Kotani
- Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute, Hyogo, Japan
| | - Motoi Kimata
- Institute of Materials Research, Tohoku University, Sendai, Japan
| | - Hiroyuki Nojiri
- Institute of Materials Research, Tohoku University, Sendai, Japan
| | - Tetsuya Nakamura
- International Center for Synchrotron Radiation Innovation Smart, Tohoku University, Sendai, Japan
| | - Tian Liang
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
- Frontier Science Center for Quantum Information, Beijing, China
| | - Di Yi
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
| | - Tianxiang Nan
- School of Integrated Circuits, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing, China
| | - Jiadong Zang
- Department of Physics and Astronomy, University of New Hampshire, Durham, NH, USA
| | - Zhigao Sheng
- High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei, China
| | - Qing He
- Department of Physics, Durham University, Durham, UK
| | - Shuyun Zhou
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China
- Frontier Science Center for Quantum Information, Beijing, China
| | - Naoto Nagaosa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
- Department of Applied Physics, University of Tokyo, Tokyo, Japan
| | - Ce-Wen Nan
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China
| | - Yoshinori Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
- Department of Applied Physics, University of Tokyo, Tokyo, Japan
| | - Rong Yu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China.
- MOE Key Laboratory of Advanced Materials, Tsinghua University, Beijing, China.
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA.
| | - Pu Yu
- State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, China.
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan.
- Frontier Science Center for Quantum Information, Beijing, China.
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2
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Helm T, Kimata M, Sudo K, Miyata A, Stirnat J, Förster T, Hornung J, König M, Sheikin I, Pourret A, Lapertot G, Aoki D, Knebel G, Wosnitza J, Brison JP. Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe 2. Nat Commun 2024; 15:37. [PMID: 38167667 PMCID: PMC10761692 DOI: 10.1038/s41467-023-44183-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
The potential spin-triplet heavy-fermion superconductor UTe2 exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μ0Hm ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to Hm. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above Hm. In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of μ0Hc2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above Hm in the angular range around 30° caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above Hm.
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Affiliation(s)
- Toni Helm
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Kenta Sudo
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Atsuhiko Miyata
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Julia Stirnat
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Tobias Förster
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Jacob Hornung
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Markus König
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Ilya Sheikin
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042, Grenoble, France
| | - Alexandre Pourret
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Gerard Lapertot
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - Georg Knebel
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Joachim Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Jean-Pascal Brison
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
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3
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Sakai H, Tokiwa Y, Opletal P, Kimata M, Awaji S, Sasaki T, Aoki D, Kambe S, Tokunaga Y, Haga Y. Field Induced Multiple Superconducting Phases in UTe_{2} along Hard Magnetic Axis. Phys Rev Lett 2023; 130:196002. [PMID: 37243663 DOI: 10.1103/physrevlett.130.196002] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/19/2022] [Accepted: 04/04/2023] [Indexed: 05/29/2023]
Abstract
The superconducting (SC) phase diagram in uranium ditelluride is explored under magnetic fields (H) along the hard magnetic b axis using a high-quality single crystal with T_{c}=2.1 K. Simultaneous electrical resistivity and ac magnetic susceptibility measurements discern low- and high-field SC (LFSC and HFSC, respectively) phases with contrasting field-angular dependence. Crystal quality increases the upper critical field of the LFSC phase, but the H^{*} of ∼15 T, at which the HFSC phase appears, is always the same through the various crystals. A phase boundary signature is also observed inside the LFSC phase near H^{*}, indicating an intermediate SC phase characterized by small flux pinning forces.
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Affiliation(s)
- H Sakai
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Tokiwa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - P Opletal
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - M Kimata
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - S Awaji
- High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - T Sasaki
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - D Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
| | - S Kambe
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Tokunaga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Y Haga
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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4
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Ogawa S, Kimata M, Tomiyama M, Satoh M. Heritability and genetic correlation estimates of semen production traits with litter traits and pork production traits in purebred Duroc pigs. J Anim Sci 2022; 100:6535633. [PMID: 35201314 PMCID: PMC9030147 DOI: 10.1093/jas/skac055] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 01/13/2022] [Accepted: 02/23/2022] [Indexed: 11/30/2022] Open
Abstract
We estimated heritabilities of semen production traits and their genetic correlations with litter traits and pork production traits in purebred Duroc pigs. Semen production traits were semen volume, sperm concentration, proportion of morphologically normal sperms, total number of sperm, and total number of morphologically normal sperm. Litter traits at farrowing were total number born, number born alive, number stillborn, total litter weight at birth, mean litter weight at birth, and piglet survival rate at birth. Litter traits at weaning were litter size at weaning, total litter weight at weaning, mean litter weight at weaning, and piglet survival rate from birth to weaning. Pork production traits were average daily gain, backfat thickness, and loin muscle area. We analyzed 45,913 semen collection records of 896 boars, 6,950 farrowing performance records of 1,400 sows, 2,237 weaning performance records of 586 sows, and individual growth performance records of 9,550 animals measured at approximately 5 mo of age. Heritabilities were estimated using a single-trait animal model. Genetic correlations were estimated using a 2-trait animal model. Estimated heritabilities of semen production traits ranged from 0.20 for sperm concentration to 0.29 for semen volume and were equal to or higher than those of litter traits, ranging from 0.06 for number stillborn and piglet survival rate at birth to 0.25 for mean litter weight at birth, but lower than those of pork production traits, ranging from 0.50 for average daily gain to 0.63 for backfat thickness. In many cases, the absolute values of estimated genetic correlations between semen production traits and other traits were smaller than 0.3. These estimated genetic parameters provide useful information for establishing a comprehensive pig breeding scheme. Genetic parameters of 5 semen production traits, 10 litter traits, and 3 pork production traits in purebred Duroc pigs was estimated. Heritabilities of semen production traits ranged from 0.20 for sperm concentration to 0.29 for semen volume and were equal to or higher than those of litter traits, ranging from 0.06 for number stillborn and piglet survival rate at birth to 0.25 for mean litter weight at birth, but lower than those of pork production traits, ranging from 0.50 for average daily gain to 0.63 for backfat thickness. In many cases, the absolute values of genetic correlations between semen production traits and other traits were smaller than 0.3. These estimated genetic parameters provide useful information for establishing a comprehensive pig breeding scheme.
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Affiliation(s)
- S Ogawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572, Japan
| | - M Kimata
- CIMCO Corporation, Koto-ku, Tokyo 136-0071, Japan
| | - M Tomiyama
- CIMCO Corporation, Koto-ku, Tokyo 136-0071, Japan
| | - M Satoh
- Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 980-8572, Japan
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5
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Kimata M, Sasabe N, Kurita K, Yamasaki Y, Tabata C, Yokoyama Y, Kotani Y, Ikhlas M, Tomita T, Amemiya K, Nojiri H, Nakatsuji S, Koretsune T, Nakao H, Arima TH, Nakamura T. X-ray study of ferroic octupole order producing anomalous Hall effect. Nat Commun 2021; 12:5582. [PMID: 34552070 PMCID: PMC8458343 DOI: 10.1038/s41467-021-25834-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 08/29/2021] [Indexed: 11/21/2022] Open
Abstract
Recently found anomalous Hall, Nernst, magnetooptical Kerr, and spin Hall effects in the antiferromagnets Mn3X (X = Sn, Ge) are attracting much attention for spintronics and energy harvesting. Since these materials are antiferromagnets, the origin of these functionalities is expected to be different from that of conventional ferromagnets. Here, we report the observation of ferroic order of magnetic octupole in Mn3Sn by X-ray magnetic circular dichroism, which is only predicted theoretically so far. The observed signals are clearly decoupled with the behaviors of uniform magnetization, indicating that the present X-ray magnetic circular dichroism is not arising from the conventional magnetization. We have found that the appearance of this anomalous signal coincides with the time reversal symmetry broken cluster magnetic octupole order. Our study demonstrates that the exotic material functionalities are closely related to the multipole order, which can produce unconventional cross correlation functionalities.
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Affiliation(s)
- Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan.
| | - Norimasa Sasabe
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Kensuke Kurita
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - Yuichi Yamasaki
- Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan
- Center for Emergent Matter Science (CEMS), RIKEN, Wako, 351-0198, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo, 102-0076, Japan
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, 305-0801, Japan
| | - Chihiro Tabata
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan
| | - Yuichi Yokoyama
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Yoshinori Kotani
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Muhammad Ikhlas
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Takahiro Tomita
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Kenta Amemiya
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, 305-0801, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
- Department of Physics, University of Tokyo, Hongo, Tokyo, 113-0033, Japan
- The Institute for Quantum Matter, Johns Hopkins University, Baltimore, MD, 21218, USA
- Trans-scale Quantum Science Institute, University of Tokyo, Hongo, Tokyo, 113-8654, Japan
| | - Takashi Koretsune
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
| | - Hironori Nakao
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, 305-0801, Japan
| | - Taka-Hisa Arima
- Center for Emergent Matter Science (CEMS), RIKEN, Wako, 351-0198, Japan
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan
| | - Tetsuya Nakamura
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
- International Center for Synchrotron Radiation Innovation Smart, Tohoku University, Sendai, Miyagi, 980-8577, Japan
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6
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Sasabe N, Kimata M, Nakamura T. Presence of X-Ray Magnetic Circular Dichroism Signal for Zero-Magnetization Antiferromagnetic State. Phys Rev Lett 2021; 126:157402. [PMID: 33929244 DOI: 10.1103/physrevlett.126.157402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 02/12/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
X-ray magnetic circular dichroism (XMCD) is generally not observed for antiferromagnetic (AFM) states because XMCD signals from the antiparallelly coupled spins cancel each other. In this Letter, we theoretically show the presence of an XMCD signal from compensated two-dimensional triangle AFM structures on a Kagome lattice. The calculation reveals the complete correspondence between the XMCD spectra and the sign of the spin chirality: the XMCD signal only appears when the spin chirality is negative. This XMCD signal originates from the different absorption coefficients of the three sublattices reflecting different charge density anisotropies and directions of spin and orbital magnetic moments.
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Affiliation(s)
- Norimasa Sasabe
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - Tetsuya Nakamura
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
- Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-8577, Japan
- International Center for Synchrotron Radiation Innovation Smart, Tohoku University, Sendai, Miyagi 980-8577, Japan
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7
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Kimata M, Chen H, Kondou K, Sugimoto S, Muduli PK, Ikhlas M, Omori Y, Tomita T, MacDonald AH, Nakatsuji S, Otani Y. Magnetic and magnetic inverse spin Hall effects in a non-collinear antiferromagnet. Nature 2019; 565:627-630. [DOI: 10.1038/s41586-018-0853-0] [Citation(s) in RCA: 168] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 10/25/2018] [Indexed: 11/09/2022]
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8
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Sakurai T, Kimura S, Kimata M, Nojiri H, Awaji S, Okubo S, Ohta H, Uwatoko Y, Kudo K, Koike Y. Development and application of 2.5 GPa-25 T high-pressure high-field electron spin resonance system using a cryogen-free superconducting magnet. J Magn Reson 2018; 296:1-4. [PMID: 30165264 DOI: 10.1016/j.jmr.2018.08.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/20/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
We have developed a high-pressure electron spin resonance probe and successfully installed into the world's highest-field cryogen-free superconducting magnet having a maximum central field of 24.6 T. The high pressure of 2.5 GPa is achieved by the specially designed piston-cylinder pressure cell using THz-wave-transparent components. In the first application of this high-pressure high-field ESR system, we observed that the orthogonal dimer spin system SrCu2(BO3)2 undergoes a quantum phase transition from the dimer singlet ground to the plaquette singlet ground states.
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Affiliation(s)
- T Sakurai
- Research Facility Center for Science and Technology, Kobe University, Nada, Kobe 657-8501, Japan.
| | - S Kimura
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - M Kimata
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - H Nojiri
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - S Awaji
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - S Okubo
- Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501, Japan
| | - H Ohta
- Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501, Japan
| | - Y Uwatoko
- Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
| | - K Kudo
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - Y Koike
- Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
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Suzawa S, Yokouchi N, Baba A, Yamane K, Kim T, Kimata M, Sugawara I, Murayama H. OBSTACLES TO CONTINUE STAYING AT HOME IN JAPAN: VIEWPOINTS OF OLDER PERSONS, FAMILY CAREGIVERS AND CARE SPECIALISTS. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2464] [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: 11/12/2022] Open
Affiliation(s)
| | | | - A Baba
- The University of Tokyo, Tokyo, Japan
| | - K Yamane
- The University of Tokyo, Tokyo, Japan
| | - T Kim
- The University of Tokyo, Tokyo, Japan
| | - M Kimata
- Institute of Gerontology, The University of Tokyo, Tokyo, Japan
| | - I Sugawara
- Institute of Gerontology, The University of Tokyo, Tokyo, Japan
| | - H Murayama
- Institute of Gerontology, The University of Tokyo
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10
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Sumikawa Y, Baba A, Fukui C, Kimata M, Murayama H, Sugawara I. DECISION-MAKING PROCESS REGARDING RELOCATION TO A GROUP HOME FOR PERSONS WITH DEMENTIA. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.405] [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: 11/13/2022] Open
Affiliation(s)
- Y Sumikawa
- Department of Community Health Nursing, School of Health Sciences and Nursing, Graduate School of Medicine, The University of Tokyo
| | - A Baba
- The University of Tokyo, Tokyo, Japan
| | - C Fukui
- Department of Family Nursing, School of Health Sciences and Nursing, Graduate School of Medicine,The University of Tokyo
| | - M Kimata
- Institute of Gerontology, The University of Tokyo, Tokyo, Japan
| | - H Murayama
- Institute of Gerontology, The University of Tokyo
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11
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Abstract
For a long time, there were no efficient ways of controlling antiferromagnets. Quite a strong magnetic field was required to manipulate the magnetic moments because of a high molecular field and a small magnetic susceptibility. It was also difficult to detect the orientation of the magnetic moments since the net magnetic moment is effectively zero. For these reasons, research on antiferromagnets has not been progressed as drastically as that on ferromagnets which are the main materials in modern spintronic devices. Here we show that the magnetic moments in NiO, a typical natural antiferromagnet, can indeed be controlled by the spin torque with a relatively small electric current density (~4 × 107 A/cm2) and their orientation is detected by the transverse resistance resulting from the spin Hall magnetoresistance. The demonstrated techniques of controlling and detecting antiferromagnets would outstandingly promote the methodologies in the recently emerged “antiferromagnetic spintronics”. Furthermore, our results essentially lead to a spin torque antiferromagnetic memory.
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Affiliation(s)
- Takahiro Moriyama
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan. .,Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka, 560-8531, Japan.
| | - Kent Oda
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Takuo Ohkochi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, 679-5198, Japan
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Teruo Ono
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan.,Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka, 560-8531, Japan
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12
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Kimata M. ROLE AWARENESS OF HOME-VISIT NURSES IN MULTIDISCIPLINARY COLLABORATION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1620] [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: 11/13/2022] Open
Affiliation(s)
- M. Kimata
- Institute of Gerontology, The University of Tokyo, Tokyo, Bunkyo-ku, Japan
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13
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Sugii K, Shimozawa M, Watanabe D, Suzuki Y, Halim M, Kimata M, Matsumoto Y, Nakatsuji S, Yamashita M. Thermal Hall Effect in a Phonon-Glass Ba_{3}CuSb_{2}O_{9}. Phys Rev Lett 2017; 118:145902. [PMID: 28430491 DOI: 10.1103/physrevlett.118.145902] [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] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Indexed: 06/07/2023]
Abstract
A distinct thermal Hall signal is observed in a quantum spin liquid candidate Ba_{3}CuSb_{2}O_{9}. The transverse thermal conductivity shows a power-law temperature dependence below 50 K, where a spin gap opens. We suggest that because of the very low longitudinal thermal conductivity and the thermal Hall signals, a phonon Hall effect is induced by strong phonon scattering of orphan Cu^{2+} spins formed in the random domains of the Cu^{2+}-Sb^{5+} dumbbells in Ba_{3}CuSb_{2}O_{9}.
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Affiliation(s)
- K Sugii
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - M Shimozawa
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - D Watanabe
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Suzuki
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - M Halim
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - M Kimata
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Matsumoto
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - S Nakatsuji
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
| | - M Yamashita
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan
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14
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Tajima H, Nishioka Y, Sato S, Suzuki T, Kimata M. Magnetic field effects of photocarrier generation in bulk heterojunctions at low temperature. Dalton Trans 2016; 45:16616-16623. [PMID: 27484333 DOI: 10.1039/c6dt02132h] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an experimental investigation of the magnetic field effect (MFE) in polymer bulk heterojunction devices at temperatures below 10 K using photocarrier extraction by linearly increasing voltages. The examined devices were composed of an active layer of poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester. In the experiments, the delay time (td) dependence of the MFE was investigated in detail. For td < 80 μs, a positive MFE was observed in the field region B < 0.1 T and a negative MFE was observed for B > 0.2 T. For td > 8 ms, only a positive MFE proportional to B2 was observed. For the photocurrent pulse detected immediately after light irradiation, the MFE was negligibly small. In a high magnetic field of 15 T, a significant MFE exceeding 80% was observed at 1.8 K for td = 800 ms. We discuss the results based on a model of triplet-singlet (or singlet-triplet) conversion in the magnetic field and estimate the exchange integral for the charge-transfer exciton in this photovoltaic cell.
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Affiliation(s)
- H Tajima
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan.
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15
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Niimi Y, Kimata M, Omori Y, Gu B, Ziman T, Maekawa S, Fert A, Otani Y. Strong Suppression of the Spin Hall Effect in the Spin Glass State. Phys Rev Lett 2015; 115:196602. [PMID: 26588404 DOI: 10.1103/physrevlett.115.196602] [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] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Indexed: 06/05/2023]
Abstract
We have measured spin Hall effects in spin glass metals, CuMnBi alloys, with the spin absorption method in the lateral spin valve structure. Far above the spin glass temperature T(g) where the magnetic moments of Mn impurities are randomly frozen, the spin Hall angle of a CuMnBi ternary alloy is as large as that of a CuBi binary alloy. Surprisingly, however, it starts to decrease at about 4T(g) and becomes as little as 7 times smaller at 0.5T(g). A similar tendency was also observed in anomalous Hall effects in the ternary alloys. We propose an explanation in terms of a simple model considering the relative dynamics between the localized moment and the conduction electron spin.
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Affiliation(s)
- Y Niimi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - M Kimata
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - Y Omori
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
| | - B Gu
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
| | - T Ziman
- Institut Laue Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France
- LPMMC (UMR 5493), Université Grenoble Alpes and CNRS, 25 rue des Martyrs, B.P. 166, 38042 Grenoble, France
| | - S Maekawa
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
- ERATO, Japan Science and Technology Agency, Sendai 980-8577, Japan
| | - A Fert
- Unité Mixte de Physique CNRS/Thales, 91767 Palaiseau France associée à l'Université de Paris-Sud, 91405 Orsay, France
| | - Y Otani
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8581, Japan
- RIKEN-CEMS, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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16
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Isono T, Kamo H, Ueda A, Takahashi K, Kimata M, Tajima H, Tsuchiya S, Terashima T, Uji S, Mori H. Gapless quantum spin liquid in an organic spin-1/2 triangular-lattice κ-H3(Cat-EDT-TTF)2. Phys Rev Lett 2014; 112:177201. [PMID: 24836269 DOI: 10.1103/physrevlett.112.177201] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Indexed: 06/03/2023]
Abstract
We report the results of SQUID and torque magnetometry of an organic spin-1/2 triangular-lattice κ-H(3)(Cat-EDT-TTF)(2). Despite antiferromagnetic exchange coupling at 80-100 K, we observed no sign of antiferromagnetic order down to 50 mK owing to spin frustration on the triangular lattice. In addition, we found nearly temperature-independent susceptibility below 3 K associated with Pauli paramagnetism. These observations suggest the development of gapless quantum spin liquid as the ground state. On the basis of a comparative discussion, we point out that the gapless quantum spin liquid states in organic systems share a possible mechanism, namely the formation of a band with a Fermi surface possibly attributed to spinons.
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Affiliation(s)
- Takayuki Isono
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Hiromichi Kamo
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Akira Ueda
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | | | - Motoi Kimata
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Hiroyuki Tajima
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Satoshi Tsuchiya
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Taichi Terashima
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Shinya Uji
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
| | - Hatsumi Mori
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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17
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Uji S, Kodama K, Sugii K, Takahide Y, Terashima T, Kurita N, Tsuchiya S, Kohno M, Kimata M, Yamamoto K, Yakushi K. Kosterlitz-Thouless-type transition in a charge ordered state of the layered organic conductor α-(BEDT-TTF)2I3. Phys Rev Lett 2013; 110:196602. [PMID: 23705731 DOI: 10.1103/physrevlett.110.196602] [Citation(s) in RCA: 2] [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: 11/08/2012] [Indexed: 06/02/2023]
Abstract
The current-voltage characteristics in the charge order state of the two-dimensional organic conductor α-(BEDT-TTF)(2)I(3) exhibit power law behavior at low temperatures. The power law is understood in terms of the electric-field-dependent potential between electrons and holes, which are thermally excited from the charge order state. The power law exponent steeply changes from 1 to 3 in the range from 30 to 45 K with decreasing temperature, thereby suggesting the occurrence of a Kosterlitz-Thouless-type transition; many (few) unbound electron-hole pairs are thermally excited above (below) the transition. The effects of the finite size and interlayer coupling on the power law behavior are discussed.
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Affiliation(s)
- S Uji
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
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18
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Amano K, Ishiguchi M, Aikawa T, Kimata M, Kishi N, Fujimaki T, Murakami A, Kogo M. Cleft Lip in Oculodentodigital Dysplasia Suggests Novel Roles for Connexin43. J Dent Res 2012; 91:38S-44S. [DOI: 10.1177/0022034512447952] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Oculodentodigital Dysplasia (ODDD) is a rare syndrome involving anomalies in eye, tooth, and digit formation, caused by mutations in CX43/ GJA1. In addition to classic dental features, ODDD includes oral and craniofacial accessory symptoms such as characteristic facial appearance and cleft palate. However, there have been no reports of ODDD accompanied by cleft lip. Herein we report, for the first time, a male, sporadic, Asian proband presenting bilateral cleft lip. By direct sequence analysis, our proband was diagnosed as having ODDD with a heterozygous mutation, codon 142 G>A in GJA1 and CX43E48K. We excluded the possibility of pathogenic mutations in B3GALTL, BMP4, TFAP2A, PVRL1, IRF6, and MSX1. To address how CX43/ GJA1 is related to cleft lip, we performed immunohistochemistry using mouse and human mid-facial tissue. CX43 expression was detected in the nasal compartment and nasal and maxillary processes at murine developmental stage E12.5. Furthermore, CX43 expression was found in the epithelial tissue inside the human subepithelial cleft lip that completes epithelial fusion. Therefore, we suggest that CX43/ GJA1 is involved in lip formation. Our case report of ODDD with a bilateral cleft lip suggests that CX43/ GJA1 might be a novel candidate gene for syndromic cleft lip.
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Affiliation(s)
- K. Amano
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
- Department of Developmental Biology, Harvard School of Dental Medicine, Boston, MA, USA
| | - M. Ishiguchi
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - T. Aikawa
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - M. Kimata
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - N. Kishi
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
| | - T. Fujimaki
- Department of Ophthalmology, Juntendo University School of Medicine, Tokyo, Japan
| | - A. Murakami
- Department of Ophthalmology, Juntendo University School of Medicine, Tokyo, Japan
| | - M. Kogo
- The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan
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19
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Kimata M, Terashima T, Kurita N, Satsukawa H, Harada A, Kodama K, Takehana K, Imanaka Y, Takamasu T, Kihou K, Lee CH, Kito H, Eisaki H, Iyo A, Fukazawa H, Kohori Y, Harima H, Uji S. Cyclotron resonance and mass enhancement by electron correlation in KFe2As2. Phys Rev Lett 2011; 107:166402. [PMID: 22107409 DOI: 10.1103/physrevlett.107.166402] [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] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Indexed: 05/31/2023]
Abstract
Cyclotron resonance (CR) measurements for the Fe-based superconductor KFe(2)As(2) are performed. One signal for CR is observed, and is attributed to the two-dimensional α Fermi surface at the Γ point. We found a large discrepancy in the effective masses of CR [(3.4±0.05)m(e) (m(e) is the free-electron mass)] and de Haas-van Alphen results, a direct evidence of mass enhancement due to electronic correlation. A comparison of the CR and de Haas-van Alphen results shows that both intra- and interband electronic correlations contribute to the mass enhancement in KFe(2)As(2).
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Affiliation(s)
- Motoi Kimata
- National Institute for Materials Science (NIMS), Ibaraki, Japan
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20
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Harada A, Enomoto K, Takahide Y, Kimata M, Yakabe T, Kodama K, Satsukawa H, Kurita N, Tsuchiya S, Terashima T, Uji S. Flow of a single magnetic vortex in a submicron-size superconducting Al disk controlled by radio-frequency currents. Phys Rev Lett 2011; 107:077002. [PMID: 21902419 DOI: 10.1103/physrevlett.107.077002] [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] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Indexed: 05/31/2023]
Abstract
We report the first observation of a single-vortex flow in a mesoscopic superconductor. A flow of a single vortex is successfully controlled by an rf current superimposed on a dc current, evidence of which is provided by voltage steps in current-voltage (I-V) characteristics. Irrespective of the number of vortices confined to the disk, we unambiguously observe that when a single vortex inside the disk is driven out of the disk, another vortex enters the disk similarly to two balls colliding in billiards: only one vortex passes through the Al disk at the same time in mesoscopic systems.
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Affiliation(s)
- Atsushi Harada
- National Institute for Materials Science, Ibaraki, Japan
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21
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Uji S, Kimata M, Moriyama S, Yamada J, Graf D, Brooks JS. Density-of-state oscillation of quasiparticle excitation in the spin density wave phase of (TMTSF)2ClO4. Phys Rev Lett 2010; 105:267201. [PMID: 21231708 DOI: 10.1103/physrevlett.105.267201] [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] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Indexed: 05/30/2023]
Abstract
Systematic measurements of the magnetocaloric effect, heat capacity, and magnetic torque under a high magnetic field up to 35 T are performed in the spin density wave (SDW) phase of a quasi-one-dimensional organic conductor (TMTSF)2ClO4. In the SDW phase above 26 T, where the quantum Hall effect is broken, rapid oscillations (ROs) in these thermodynamic quantities are observed, which provides clear evidence of the density-of-state (DOS) oscillation near the Fermi level. The resistance is semiconducting and the heat capacity divided by temperature is extrapolated to zero at 0 K in the SDW phase, showing that all the energy bands are gapped, and there is no DOS at the Fermi level. The results show that the ROs are ascribed to the DOS oscillation of the quasiparticle excitation.
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Affiliation(s)
- S Uji
- National Institute for Materials Science, Tsukuba, Ibaraki, Japan
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22
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Kimata M, Terashima T, Kurita N, Satsukawa H, Harada A, Kodama K, Sato A, Imai M, Kihou K, Lee CH, Kito H, Eisaki H, Iyo A, Saito T, Fukazawa H, Kohori Y, Harima H, Uji S. Quasi-two-dimensional Fermi surfaces and coherent interlayer transport in KFe₂As₂. Phys Rev Lett 2010; 105:246403. [PMID: 21231539 DOI: 10.1103/physrevlett.105.246403] [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] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Indexed: 05/30/2023]
Abstract
We report the results of the angular-dependent magnetoresistance oscillations (AMROs), which can determine the shape of bulk Fermi surfaces (FSs) in quasi-two-dimensional (Q2D) systems, in a highly hole-doped Fe-based superconductor KFe2As2 with Tc ≈ 3.7 K. From the AMROs, we determined the two Q2D FSs with rounded-square cross sections, correspond to 12% and 17% of the first Brillouin zone. The rounded-squared shape of the FS cross section is also confirmed by the analyses of the interlayer transport under in-plane fields. From the obtained FS shape, we infer the character of the 3d orbitals that contribute to the FSs.
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Affiliation(s)
- M Kimata
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
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23
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Terashima T, Kimata M, Kurita N, Satsukawa H, Harada A, Hazama K, Imai M, Sato A, Kihou K, Lee CH, Kito H, Eisaki H, Iyo A, Saito T, Fukazawa H, Kohori Y, Harima H, Uji S. Comment on "Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2". Phys Rev Lett 2010; 104:259701-259702. [PMID: 20867420 DOI: 10.1103/physrevlett.104.259701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Indexed: 05/29/2023]
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Ohmichi E, Mizuno N, Kimata M, Ohta H, Osada T. High-frequency electron spin resonance system using a microcantilever and a pulsed magnetic field. Rev Sci Instrum 2009; 80:013904. [PMID: 19191444 DOI: 10.1063/1.3069287] [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] [Indexed: 05/27/2023]
Abstract
A novel technique of high-frequency electron spin resonance (ESR) in a pulsed magnetic field is presented. Our technique is based on the magnetic detection of a magnetization change associated with the ESR absorption using a microcantilever. We successfully observed ESR signals of a microcrystal (mass approximately 1 microg) in the millimeter-wave region up to 130 GHz in pulsed magnetic fields of up to 2.4 T. This result corresponds to the spin sensitivity of approximately 10(11) spins/G, which is four orders of magnitude better than that of conventional transmission-type ESR techniques.
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Affiliation(s)
- E Ohmichi
- Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
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Ohmichi E, Mizuno N, Kimata M, Ohta H. Magnetic detection of high-resolution electron spin resonance using a microcantilever in the millimeter-wave region up to 240 GHz. Rev Sci Instrum 2008; 79:103903. [PMID: 19044725 DOI: 10.1063/1.2988834] [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: 05/27/2023]
Abstract
Highly sensitive magnetic detection of electron spin resonance (ESR) using a microcantilever is presented. By combining a modulation technique with the use of a piezoresistive cantilever, we successfully observed ESR signals of a tiny single crystal (mass<1 microg) of Co Tutton salt, Co(NH(4))(2)(SO(4))(2) x 6 H(2)O, in the frequency region of 80-240 GHz. The achieved spin sensitivity was approximately 10(9) spins/G at 4.5 K, providing promising applications to high-resolution and high-sensitivity terahertz ESR.
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Affiliation(s)
- E Ohmichi
- Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
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26
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Echigo T, Kimata M. The hydrogen bonds in transition metal oxalate complexes: influence of Jahn–Teller distortion. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308085760] [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: 11/10/2022] Open
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27
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Hoshino M, Kimata M, Nishida N, Shimizu M, Akasaka T. First report of natural oxyallanite: oxidation and dehydration during welding of volcanic tuff. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308084250] [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: 11/10/2022] Open
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28
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Ishida N, Kimata M. Hydronium ion in Al-bearing fluorapophyllite. Acta Crystallogr A 2007. [DOI: 10.1107/s0108767307093804] [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: 11/11/2022] Open
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29
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Ohta H, Kimata M, Okubo S, Ohmichi E, Osada T. Highly Sensitive Detection of Pulsed Field ESR Using a Cantilever at Low Temperature. ACTA ACUST UNITED AC 2006. [DOI: 10.1063/1.2355337] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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30
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Kyono A, Kimata M, Hatta T. Light-induced degradation dynamics in realgar (As 4S 4). Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305083984] [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: 11/10/2022] Open
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31
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Echigo T, Kimata M, Kyono A. Crystal structures of Rb 2(C 2O 4).H 2O and Tl 2(C 2O 4): application of valence matching rule. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305084023] [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: 11/10/2022] Open
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Inagaki N, Nakai N, Kimata M, Kawasaki H, Nagai H. Recovery of purification-associated reduction in antigen-induced histamine release from rat peritoneal mast cells. Biol Pharm Bull 2001; 24:829-34. [PMID: 11456125 DOI: 10.1248/bpb.24.829] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Immunoglobulin E (IgE)-dependent histamine release from purified rat peritoneal mast cells (PMC) is very low in comparison to that from a non-purified preparation (PEC). The reduced histamine release from PMC is recovered or potentiated by reconstitution with separated non-mast cells (NMC). In the present study, further characterization was undertaken to elucidate the mechanisms involved. Sensitized mast cells were recovered from peritoneal cavities of rats, and purified by density gradient centrifugation with Percoll. Effects of NMC reconstitution, membrane fraction of NMC, NMC incubation supernatant, adhesion molecules and extracellular matrix proteins on IgE-dependent histamine release from PMC were examined. IgE-dependent histamine release was significantly potentiated by NMC reconstitution to PMC. The potentiation was dependent on the concentration of NMC reconstituted and reached a plateau after 30 min incubation. Increasing concentration of PMC did not affect the histamine release. Membrane fraction prepared from NMC also potentiated PMC histamine release in a dose-dependent manner. The potentiation reached a plateau in 5 min. Furthermore, incubation supernatant of NMC potentiated PMC histamine release. Antibodies against intercellular adhesion molecule (ICAM)-1, lymphocyte function-associated antigen (LFA)-1, very late activation antigen (VLA)-1, VLA-4 and VLA-6, and fibronectin did not affect the potentiation of PMC histamine release by NMC reconstitution. Fibronectin, laminin and collagen failed to potentiate PMC histamine release. These results indicate that the membrane component(s) of NMC in the rat peritoneal cavity seems to modulate IgE-dependent histamine release from peritoneal mast cells of rats, and that the active molecule(s) may be released from NMC. Adhesion molecules such as ICAM-1, LFA-1 and VLA are not involved.
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Affiliation(s)
- N Inagaki
- Department of Pharmacology, Gifu Pharmaceutical University, Japan.
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Kimata M, Abe T, Yamaguchi I, Mito K, Tsunematsu M, Inagaki N, Nagai H. Prednisolone inhibits an IgE-mediated late-phase allergic cutaneous reactionby interfering with the activation of mast cells in mice. Pharmacology 2001; 62:17-22. [PMID: 11150918 DOI: 10.1159/000056067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Epicutaneous antigen challenge in passively sensitized mice with IgE produces a biphasic cutaneous response which peaks 1 h (immediate-phase reaction) and 24 h (late-phase reaction; LPR) after the antigen challenge. In this model, anaphylactic degranulation and interleukin 6 (IL-6) expression between 4 and 8 h are observed in resident mast cells as the preceding stage of LPR. Prednisolone at a dose of 3 mg kg(-1) clearly inhibited the LPR when administered 2 h before and 4 h after antigen challenge. Slight or no inhibition of LPR was observed by prednisolone administered 6-12 h after challenge. Histologically, prednisolone treatment 2 h before antigen challenge completely inhibited edema and inflammatory cell infiltration, while treatment at 6 h did not at all. In order to investigate the relationship between inhibition of LPR by prednisolone and mast cell activation, the effects of prednisolone on degranulation of mast cells and IL-6 expression in mast cells were investigated. 8 h after antigen challenge, prednisolone clearly inhibited the increase in the number of anaphylactic degranulated and IL-6-positive mast cells by administration 2 h before challenge, but did not affect it by administration 6 h after challenge. These data indicate that the inhibitory mechanism of prednisolone on LPR, at least, involves the inhibition of mast cell activation before LPR.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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Otani Y, Ohgami M, Igarashi N, Kimata M, Kubota T, Kumai K, Kitajima M, Mukai M. Laparoscopic wedge resection of gastric submucosal tumors. Surg Laparosc Endosc Percutan Tech 2000. [PMID: 10872521 DOI: 10.1097/00129689-200002000-00005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Minimally invasive surgery has revolutionized the treatment of gastrointestinal tumors. Submucosal tumors (SMTs) of the stomach can be resected using laparoscopic techniques. Between 1993 and 1997, laparoscopic wedge resection was performed in 34 patients with an SMT of the stomach. The tumors ranged from 8 to 60 mm in diameter. All surgical margins were clear. The average operative time was 131 minutes. Most of the patients began eating on the first postoperative day and were discharged within 5 to 7 days. Histopathologic examination of the tumors showed gastrointestinal stromal tumor (n = 14), ectopic pancreas (n = 7), leiomyosarcoma (n = 4), schwannoma (n = 3), carcinoid (n = 2), leiomyoma (n = 2), an inflammatory lesion caused by parasites (n = 1), and cyst (n = 1). No recurrences were observed over the 5-year follow-up period. A solid SMT of the stomach larger than 20 mm in diameter can be treated using laparoscopic wedge resection.
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Affiliation(s)
- Y Otani
- Department of Surgery, School of Medicine, Keio University, Tokyo, Japan
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36
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Kimata M, Inagaki N, Kato T, Miura T, Serizawa I, Nagai H. Roles of mitogen-activated protein kinase pathways for mediator release from human cultured mast cells. Biochem Pharmacol 2000; 60:589-94. [PMID: 10874134 DOI: 10.1016/s0006-2952(00)00354-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Human cultured mast cells (HCMC) secrete histamine, sulfidoleukotrienes (LTs), and prostaglandin D(2) (PGD(2)), and produce a variety of cytokines after aggregation of high-affinity receptors for IgE (FcepsilonRI). With respect to the mitogen-activated protein kinase (MAPK) family, extracellular signal-regulated kinases (ERKs), c-Jun NH(2)-terminal kinases (JNKs), and p38 mitogen-activated protein kinase (p38 MAPK) are known. To investigate the roles of these kinase pathways for mediator release from human mast cells, we examined the participation of the activation of these kinases in mediator release, using 1,4-diamino-2, 3-dicyano-1,4-bis(2-aminophenylthio)butadiene (U0126), an ERK pathway inhibitor, and 4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)1H-imid azo le (SB203580), a p38 MAPK pathway inhibitor. U0126 inhibited ERK activation, LT and PGD(2) release, and granulocyte macrophage-colony stimulating factor (GM-CSF) production after stimulation of HCMC. SB203580, on the other hand, potentiated JNK activation and GM-CSF production. The findings of the present study demonstrated that: (i) the release of arachidonic acid metabolites is mediated by the ERK pathway; (ii) GM-CSF production may be driven by both the ERK and JNK pathways; and (iii) the p38 MAPK pathway negatively regulates the JNK pathway. This suggests that MAPK pathways play important roles in mediator release from human mast cells.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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Okamura S, Urakami K, Kimata M, Aoshima T, Shimamoto S, Moriyama R, Makino S. The N-terminal prepeptide is required for the production of spore cortex-lytic enzyme from its inactive precursor during germination of Clostridium perfringens S40 spores. Mol Microbiol 2000; 37:821-7. [PMID: 10972804 DOI: 10.1046/j.1365-2958.2000.02047.x] [Citation(s) in RCA: 20] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A spore cortex-lytic enzyme of Clostridium perfringens S40 is synthesized during sporulation as a precursor consisting of four domains. After cleavage of an N-terminal preregion and a C-terminal proregion, inactive proenzyme (termed C35) is converted to active enzyme by processing of an N-terminal prosequence with germination-specific protease (GSP) during germination. The present results demonstrated that the cleaved N-terminal prepeptide remained associated with C35. After the isolated complex was denatured and dissociated in 6 M urea solution, removal of urea regenerated a prepeptide-C35 complex which produces active enzyme when incubated with GSP. However, isolated C35 alone could not be activated by GSP. The prepeptide-C35 complex was more heat stable than active enzyme. Thus, non-covalent attachment of the prepeptide to C35 is required to assist correct folding of C35 and to stabilize its conformation, suggesting that the prepeptide functions as an intramolecular chaperone. Recombinant proteins, which have prepeptide covalently bonded to C35, were processed by GSP as well as the in vivo prepeptide-C35 complex, and the full length of the N-terminal presequence was needed to fulfil its role. Although the C-terminal prosequence is present as an independent domain which is not involved in the activation process of the enzyme, it appears that the N-terminal prosequence contributes to the regulation of enzyme activity as an inhibitor of the enzyme.
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Affiliation(s)
- S Okamura
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Japan
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Nagai H, Abe T, Yamaguchi I, Mito K, Tsunematsu M, Kimata M, Inagaki N. Role of mast cells in the onset of IgE-mediated late-phase cutaneous response in mice. J Allergy Clin Immunol 2000; 106:S91-8. [PMID: 10887340 DOI: 10.1067/mai.2000.106778] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND In mice that are passively sensitized to IgE, cutaneous antigen challenge produces a biphasic response with peaks at 1 and 24 hours after challenge. OBJECTIVE We investigated the role of mast cells in the IgE-mediated late-phase reaction in mice. METHODS We histologically and ultrastructurally investigated the morphologic changes of mast cells during the biphasic responses. RESULTS Degranulation of mast cells, which was observed between 4 and 24 hours after challenge, reached a peak at 8 hours. Piecemeal degranulation was seen during the immediate phase reaction. The number of IL-6-positive mast cells was increased after 4 hours in both IgE-sensitized and unsensitized mice, but positive cells showed a greater increase in sensitized mice and reached a peak after 8 hours. With in situ hybridization experiments, mast cells were positive for IL-6 messenger RNA at 6 hours after challenge. CONCLUSION These findings indicate that anaphylactic degranulation of mast cells and the expression of IL-6 mRNA within 4 hours after antigen challenge are important for the onset of the late-phase allergic cutaneous reaction in mice.
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Affiliation(s)
- H Nagai
- Department of Pharmacology, Gifu Pharmaceutical University, Japan
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39
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Kimata M, Kubota T, Otani Y, Ohgami M, Ishikawa Y, Yokoyama T, Issiki S, Abe S, Egawa T, Tokuyama J, Wada N, Kumai K, Kitajima M, Mukai M. Gastrointestinal stromal tumors treated by laparoscopic surgery: report of three cases. Surg Today 2000; 30:177-80. [PMID: 10664344 DOI: 10.1007/s005950050038] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Three cases of gastrointestinal stromal tumors (GIST) were treated by a laparoscopic wedge resection of the stomach. The tumor characteristics were confirmed to be nonepithelial, nonlymphomatous, nonmyogenic, and nonneurogenic gastrointestinal neoplasms with an uncertain origin which were CD34-positive and actin- and S-100-negative. The malignant potential was estimated based on the mitotic figures and growth rates. The results suggest that laparoscopic surgery is an adequate strategy for gastric submucosal tumors including GIST, and also indicates this technique to be a curative, safe, and minimally invasive procedure for both diagnosis and treatment.
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Affiliation(s)
- M Kimata
- Department of Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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Kimata M, Shichijo M, Miura T, Serizawa I, Inagaki N, Nagai H. Effects of luteolin, quercetin and baicalein on immunoglobulin E-mediated mediator release from human cultured mast cells. Clin Exp Allergy 2000; 30:501-8. [PMID: 10718847 DOI: 10.1046/j.1365-2222.2000.00768.x] [Citation(s) in RCA: 212] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Flavonoids have a variety of activities including anti-allergic activities, and are known to inhibit histamine release from human basophils and murine mast cells. OBJECTIVE The effects of luteolin, a flavone, on the immunoglobulin (Ig) E-mediated allergic mediator release from human cultured mast cells (HCMCs) were investigated and compared with those of baicalein and quercetin. METHODS HCMCs were sensitized with IgE, and then treated with flavonoids before challenge with antihuman IgE. The amount of released mediators was determined as was mobilization of intracellular Ca2+ concentration, protein kinase C (PKC) translocation and phosphorylation of intracellular proteins were detected after anti-IgE stimulation. RESULTS Luteolin, baicalein and quercetin inhibited the release of histamine, leukotrienes (LTs), prostaglandin D2 (PGD2), and granulocyte macrophage-colony stimulating factor (GM-CSF) from HCMC in a concentration-dependent manner. Additionally, the three flavonoids inhibited A23187-induced histamine release. As concerns Ca2+ signalling, luteolin and quercetin inhibited Ca2+ influx strongly, although baicalein did slightly. With regard to PKC signalling, luteolin and quercetin inhibited PKC translocation and PKC activity strongly, although baicalein did slightly. The suppression of Ca2+ and PKC signallings might contribute to the inhibition of mediator release. The activation of extracellular signal-regulated kinases (ERKs) and c-Jun NH2-terminal kinase (JNK), that were activated just before the release of LTs and PGD2 and GM-CSF mRNA expression in IgE-mediated signal transduction events, were clearly suppressed by luteolin and quercetin. In contrast, the flavonoids did not affect the activation of p38 mitogen-activated protein kinase (p38 MAPK) pathway. CONCLUSION These results indicate that luteolin is a potent inhibitor of human mast cell activation through the inhibition of Ca2+ influx and PKC activation.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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41
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Yokoyama T, Otani Y, Kurihara N, Sakurai Y, Kameyama K, Suzuki H, Igarashi N, Kimata M, Wada N, Kubota T, Kumai K, Kitajima M. Matrix metalloproteinase expression in cultured human gastric wall fibroblasts--interactions with Helicobacter pylori isolated from patients with ulcers. Aliment Pharmacol Ther 2000; 14 Suppl 1:193-8. [PMID: 10807424 DOI: 10.1046/j.1365-2036.2000.014s1193.x] [Citation(s) in RCA: 20] [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: 12/08/2022]
Abstract
BACKGROUND Matrix metalloproteinases (MMPs), enzymes capable of degrading collagens and other extracellular matrix components, have been implicated in gastric ulcer formation. However, the effect on MMP expression of Helicobacter pylori, also implicated in these lesions, has not been studied to our knowledge. AIM To seek links between H. pylori and MMP expression likely to affect gastric ulcer formation. After fibroblasts from human gastric wall were cocultured with H. pylori. concentrations of MMP-1 and -2 in the medium were determined by enzyme-linked immunosorbent assays. RESULTS Whereas MMP-1 was not detected in media from fibroblasts or H. pylori culture alone, MMP-1 was detected in cocultures (P<0.01). Similar amounts of MMP-2 were detected in medium from fibroblasts cultured alone and with H. pylori. No MMP-2 production by H. pylori cultured alone was detected. CONCLUSIONS MMP-1 appears to be important in gastric ulcer pathogenesis, and MMP-1 induction by H. pylori may impede gastric ulcer healing.
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Affiliation(s)
- T Yokoyama
- Department of Surgery, School of Medicine, Keio University, Tokyo, Japan
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Otani Y, Ohgami M, Igarashi N, Kimata M, Kubota T, Kumai K, Kitajima M, Mukai M. Laparoscopic wedge resection of gastric submucosal tumors. Surg Laparosc Endosc Percutan Tech 2000; 10:19-23. [PMID: 10872521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Minimally invasive surgery has revolutionized the treatment of gastrointestinal tumors. Submucosal tumors (SMTs) of the stomach can be resected using laparoscopic techniques. Between 1993 and 1997, laparoscopic wedge resection was performed in 34 patients with an SMT of the stomach. The tumors ranged from 8 to 60 mm in diameter. All surgical margins were clear. The average operative time was 131 minutes. Most of the patients began eating on the first postoperative day and were discharged within 5 to 7 days. Histopathologic examination of the tumors showed gastrointestinal stromal tumor (n = 14), ectopic pancreas (n = 7), leiomyosarcoma (n = 4), schwannoma (n = 3), carcinoid (n = 2), leiomyoma (n = 2), an inflammatory lesion caused by parasites (n = 1), and cyst (n = 1). No recurrences were observed over the 5-year follow-up period. A solid SMT of the stomach larger than 20 mm in diameter can be treated using laparoscopic wedge resection.
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Affiliation(s)
- Y Otani
- Department of Surgery, School of Medicine, Keio University, Tokyo, Japan
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Abstract
The anti-allergic action of luteolin was investigated in the rodent experimental allergic models. In the present study, the effects of luteolin were compared to those of baicalein, quercetin, and prednisolone. Luteolin as well as baicalein, quercetin, and prednisolone inhibited the IgE antibody-mediated biphasic cutaneous reaction (immediate phase reaction and late phase reaction) in mice. However, these compounds did not affect the histamine-, serotonin-, and platelet activating factor-induced cutaneous reactions in rats. In an in vitro study, luteolin, baicalein, and quercetin inhibited IgE-mediated histamine release from bone marrow-derived cultured murine mast cells (BMMC) and rat peritoneal mast cells. These compounds also inhibited IgE-mediated TNF-alpha and IL-6 production from BMMC. From these results, luteolin inhibited the IgE-mediated biphasic cutaneous reaction mainly by the inhibition of histamine and cytokine release from mast cells, but not through mediator antagonistic effects.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Japan
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Otani Y, Kubota T, Sakurai Y, Igarashi N, Yokoyama T, Kimata M, Wada N, Kameyama K, Kumai K, Okada Y, Kitajima M. Expression of matrix metalloproteinases in gastric carcinoma and possibility of clinical application of matrix metalloproteinase inhibitor in vivo. Ann N Y Acad Sci 1999; 878:541-3. [PMID: 10415767 DOI: 10.1111/j.1749-6632.1999.tb07721.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Y Otani
- Department of Surgery, School of Medicine, Keio University, Tokyo, Japan.
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45
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Shichijo M, Inagaki N, Kimata M, Serizawa I, Saito H, Nagai H. Role of cyclic 3',5'-adenosine monophosphate in the regulation of chemical mediator release and cytokine production from cultured human mast cells. J Allergy Clin Immunol 1999; 103:S421-8. [PMID: 10329844 DOI: 10.1016/s0091-6749(99)70157-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Cultured human mast cells are known to resemble human lung mast cells in terms of the profiles of intracellular protease, the characteristics of histamine release, and the pharmacologic properties. OBJECTIVE The role of cyclic 3',5'-adenosine monophosphate (cAMP) in chemical mediator release and cytokine production by human mast cells was determined. METHODS We investigated the effects of cAMP-elevating agents on IgE-mediated chemical mediator release and cytokine production by cultured human mast cells. We also examined the relationship between intracellular cAMP levels and the inhibition of chemical mediator release or cytokine production by various drugs. RESULTS beta-agonists significantly suppressed IgE-mediated release of histamine, leukotrienes, and PGD2 (chemical mediators) and the production of GM-CSF, IL-5 and macrophage inflammatory protein-1alpha (cytokines). Phosphodiesterase inhibitors (theophylline, rolipram, and cilostazol) had no effect on chemical mediators but suppressed cytokine production. Dibutyryl cAMP significantly suppressed both chemical mediator release and cytokine production, suggesting that their induction was regulated by intracellular cAMP. Elevation of cAMP by beta-agonists at 10 minutes after treatment correlated well with the inhibition of histamine release. There was a significant relationship between cAMP elevation at 180 minutes and the inhibition of GM-CSF production at 360 minutes by beta-agonists, rolipram, or cilostazol. Although 100 micromol/L theophylline significantly inhibited GM-CSF production, it had no effect on cAMP. CONCLUSION Elevation of cAMP may be responsible for the inhibitory effect of beta-agonists, rolipram, and cilostazol on chemical mediator release and cytokine production by cultured human mast cells. In contrast, theophylline may inhibit GM-CSF production independently of cAMP.
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Affiliation(s)
- M Shichijo
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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46
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Kimata M, Shichijo M, Miura T, Serizawa I, Inagaki N, Nagai H. Ca2+ and protein kinase C signaling for histamine and sulfidoleukotrienes released from human cultured mast cells. Biochem Biophys Res Commun 1999; 257:895-900. [PMID: 10208881 DOI: 10.1006/bbrc.1999.0557] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Human cultured mast cells (HCMC) release histamine and sulfidoleukotrienes (LTs) upon IgE-FcepsilonRI-mediated mast cell activation. We analyzed the Ca2+ and PKC signaling in HCMC and compared it to that in rodent mast cells. In HCMC, after IgE-mediated stimulation, an elevation of [Ca2+]i and PKC translocation to the membrane fraction was observed. As concerns Ca2+ signaling, 1) IgE-mediated histamine and LTs release was abolished after Ca2+ depletion, and the reconstitution of Ca2+ recovered the release of histamine and LTs. As regards PKC signaling, 1) staurosporine inhibited IgE-mediated mediator release. 2) PKC-downregulated mast cells did not release histamine and LTs. A23187 and PMA synergistically potentiated the activation of extracellular-regulated kinase and synergistically induced histamine and LTs release. These results demonstrated that HCMC might be useful for analysis of the signal transduction pathway for mediator release, such as histamine and LTs.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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Shichijo M, Inagaki N, Nakai N, Kimata M, Nakahata T, Serizawa I, Iikura Y, Saito H, Nagai H. The effects of anti-asthma drugs on mediator release from cultured human mast cells. Clin Exp Allergy 1998; 28:1228-36. [PMID: 9824389 DOI: 10.1046/j.1365-2222.1998.00394.x] [Citation(s) in RCA: 57] [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: 11/20/2022]
Abstract
BACKGROUND A method for generating human mast cells in vitro was recently established. Little is known about the pharmacological profiles of allergic mediator release from cultured mast cells. OBJECTIVE The main objective was to investigate the nature of cultured mast cells from a pharmacological point of view. We examined the effect of anti-asthma drugs on the release of histamine, sulfidoleukotrienes (LTs) and prostaglandin D2 (PGD2) from the cultured mast cells. METHODS Using the method established by Saito et al. we cultured cord blood mononuclear cells in the presence of 80 ng/mL stem cell factor (SCF), 50 ng/mL interleukin-6 (IL-6) and 300 nmol/L prostaglandin E2 (PGE2), and obtained almost pure (> 99%) mast cells. We sensitized cultured mast cells with immunoglobulin E (IgE)-rich serum, and then treated them with some anti-asthma drugs before challenge with anti-human IgE. Released histamine, LTs and PGD2 were measured by high-performance liquid chromatography, commercial enzyme-linked immunosorbent assay (ELISA) and enzyme immunoassay (EIA) systems, respectively. RESULTS The cultured mast cells released histamine, LTs and PGD2 following immunological stimulation through IgE. The mast cell stabilizing agents disodium cromoglycate (DSCG, 1 mmol/L) and azelastine (100 micromol/L) significantly inhibited the release of these three mediators. The beta-adrenoceptor agonists isoproterenol, salbutamol, and clenbuterol also inhibited all three mediators' release in a concentration-dependent manner. The non-selective and selective phosphodiesterase (PDE) inhibitors theophylline, rolipram, and cilostazol had no significant effect on mediator release at clinically useful concentrations. BAY x 1005 (a 5-lipoxygenase-activating protein inhibitor) inhibited the LTs release, whereas indomethacin (a cyclo-oxygenase I and II inhibitor) and NS-398 (a cyclo-oxygenase II inhibitor) inhibited PGD2 release. CONCLUSIONS The present results indicate that cultured mast cells release histamine, LTs and PGD2 following IgE crosslinking. Anti-asthma drugs showed a characteristic suppression of the release of each mediator. The suppressive actions of these drugs are similar to their pharmacological actions on human lung mast cells. These results suggest that cultured mast cells are useful for the analysis of function and pharmacological profiles of lung mast cells.
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Affiliation(s)
- M Shichijo
- Department of Pharmacology, Gifu Pharmaceutical University, Gifu, Japan
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48
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Kimata M, Shichijo M, Daikoku M, Inagaki N, Mori H, Nagai H. Pharmacological modulation of LPS-induced MIP-1 alpha production by peripheral blood mononuclear cells. Pharmacology 1998; 56:230-6. [PMID: 9597689 DOI: 10.1159/000028202] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In the present study, we investigated the effects of some anti-asthmatic drugs on the production of the CC chemokine, macrophage inflammatory protein-1 alpha (MIP-1 alpha), in response to lipopolysaccharide (LPS) by peripheral blood mononuclear cells (PBMC). MIP-1 alpha production was induced by LPS in a concentration-dependent fashion and reached the maximum at 10 micrograms/ml LPS (27.5 +/- 2.3 ng MIP-1 alpha/10(6) PBMC). At a submaximal concentration of LPS (1 microgram/ml), the release of MIP-1 alpha increased with time and reached the maximum 24 h after LPS stimulation. Actinomycin D and cycloheximide inhibited MIP-1 alpha production completely, but glucocorticoids did not completely inhibit MIP-1 alpha production, with a maximum inhibition of 70%. We examined the effect of beta-stimulants and phosphodiesterase inhibitors, which upregulate intracellular cyclic AMP levels, on MIP-1 alpha production. When PBMC were treated with beta-stimulants alone, beta-stimulants showed a slightly inhibitory effect on MIP-1 alpha production. However, the coadministration of roliplam significantly potentiated the inhibitory effect of beta-stimulants on MIP-1 alpha production. Moreover, db-cAMP suppressed MIP-1 alpha production dose-dependently. The above data indicate that the production of MIP-1 alpha is regulated by cyclic AMP and that cyclic AMP could provide a useful target for therapeutic treatment in asthmatic diseases and other diseases where MIP-1 alpha is involved in their etiology.
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Affiliation(s)
- M Kimata
- Department of Pharmacology, Gifu Pharmaceutical University, Japan
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Iikura Y, Otuka T, Sakamoto Y, Kimata M, Akasawa A, Uekusa T, Saito H, Sakaguchi N, Koya N, Matsumoto K. Study of clinical effects of immunotherapy in childhood asthma. Arb Paul Ehrlich Inst Bundesamt Sera Impfstoffe Frankf A M 1998:45-55. [PMID: 9383891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Tachimoto H, Ebisawa M, Iikura Y, Kimata M, Mori K, Sakaguchi N, Akasawa A, Nakajima T, Saito H. Activated human mast cells release factors supporting eosinophil survival in vitro. Int Arch Allergy Immunol 1997; 113:293-4. [PMID: 9130554 DOI: 10.1159/000237578] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- H Tachimoto
- Department of Allergy, National Children's Medical Research Center, Setagaya-ku, Tokyo, Japan
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