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  • 1
    Publication Date: 2013-01-03
    Description: Author(s): L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, and A. Hirohata Understanding the effect of the interface on electrical spin injection is of great importance for the development of semiconductor spintronics. Fe/GaAs(001) is one of the leading systems for exploring these effects due to the small lattice mismatch. We report on the correlation between the experimen... [Phys. Rev. B 87, 024401] Published Wed Jan 02, 2013
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 2
    Publication Date: 2011-06-22
    Description: Nitric oxide (NO) physiologically regulates numerous cellular responses through S-nitrosylation of protein cysteine residues. We performed antibody-array screening in conjunction with biotin-switch assays to look for S-nitrosylated proteins. Using this combination of techniques, we found that phosphatase with sequence homology to tensin (PTEN) is selectively S-nitrosylated by low concentrations of NO at a specific cysteine residue (Cys-83). S-nitrosylation of PTEN (forming SNO-PTEN) inhibits enzymatic activity and consequently stimulates the downstream Akt cascade, indicating that Cys-83 is a critical site for redox regulation of PTEN function. In ischemic mouse brain, we observed SNO-PTEN in the core and penumbra regions but found SNO-Akt, which is known to inhibit Akt activity, only in the ischemic core. These findings suggest that low concentrations of NO, as found in the penumbra, preferentially S-nitrosylate PTEN, whereas higher concentrations of NO, known to exist in the ischemic core, also S-nitrosylate Akt. In the penumbra, inhibition of PTEN (but not Akt) activity by S-nitrosylation would be expected to contribute to cell survival by means of enhanced Akt signaling. In contrast, in the ischemic core, SNO-Akt formation would inhibit this neuroprotective pathway. In vitro model systems support this notion. Thus, we identify unique sites of PTEN and Akt regulation by means of S-nitrosylation, resulting in an “on–off” pattern of control of Akt signaling.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 3
    Publication Date: 2012-04-10
    Description: Author(s): H. Saito, S. Ejiri, S. Aoki, T. Hatsuda, K. Kanaya, Y. Maezawa, H. Ohno, and T. Umeda [Phys. Rev. D 85, 079902] Published Mon Apr 09, 2012
    Keywords: Errata
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 4
    Publication Date: 2012-07-11
    Description: Dendritic cells (DCs) are composed of multiple subsets that play a dual role in inducing immunity and tolerance. However, it is unclear how CD205+ conventional DCs (cDCs) control immune responses in vivo. Here we generated knock-in mice with the selective conditional ablation of CD205+ cDCs. CD205+ cDCs contributed to antigen-specific priming of CD4+ T cells under steady-state conditions, whereas they were dispensable for antigen-specific CD4+ T-cell responses under inflammatory conditions. In contrast, CD205+ cDCs were required for antigen-specific priming of CD8+ T cells to generate cytotoxic T lymphocytes (CTLs) mediated through cross-presentation. Although CD205+ cDCs were involved in the thymic generation of CD4+ regulatory T cells (Tregs), they maintained the homeostasis of CD4+ Tregs and CD4+ effector T cells in peripheral and mucosal tissues. On the other hand, CD205+ cDCs were involved in the inflammation triggered by Toll-like receptor ligand as well as bacterial and viral infections. Upon microbial infections, CD205+ cDCs contributed to the cross-priming of CD8+ T cells for generating antimicrobial CTLs to efficiently eliminate pathogens, whereas they suppressed antimicrobial CD4+ T-cell responses. Thus, these findings reveal a critical role for CD205+ cDCs in the regulation of T-cell immunity and homeostasis in vivo.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 5
    Publication Date: 2011-11-15
    Description: Author(s): H. Ohno, S. Aoki, S. Ejiri, K. Kanaya, Y. Maezawa, H. Saito, and T. Umeda (WHOT-QCD Collaboration) [Phys. Rev. D 84, 094504] Published Mon Nov 14, 2011
    Keywords: Strong interactions & Lattice methods
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 6
    Publication Date: 2011-09-09
    Description: Author(s): H. Saito, S. Ejiri, S. Aoki, T. Hatsuda, K. Kanaya, Y. Maezawa, H. Ohno, and T. Umeda (WHOT-QCD Collaboration) We study the quark mass dependence of the finite temperature QCD phase transition in the heavy quark region using an effective potential defined through the probability distribution function of the average plaquette. Performing a simulation of SU(3) pure gauge theory, we first confirm that the distr... [Phys. Rev. D 84, 054502] Published Thu Sep 08, 2011
    Keywords: Strong interactions & Lattice methods
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 7
    Publication Date: 2014-03-12
    Description: Author(s): M. Ono, J. Ishihara, G. Sato, S. Matsuzaka, Y. Ohno, and H. Ohno We obtained strain and electric field gradient (EFG) in an n-GaAs/Al0.3Ga0.7As (110) quantum well (QW) by optically detected nuclear magnetic resonance (NMR). The dependence of the quadrupolar splitting on an angle between the QW plane and a static magnetic field provided the crystalline-orientation... [Phys. Rev. B 89, 115308] Published Tue Mar 11, 2014
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 8
    Publication Date: 2014-08-09
    Description: We investigate electric-field effects on the effective magnetic anisotropy energy density K eff and the Gilbert damping constant α in Ta/CoFeB/MgO structures with CoFeB thickness t ranging from 1.4 to 1.8 nm by ferromagnetic resonance. The electric field-induced modulation ratio of the areal energy density K eff t does not depend on the CoFeB thickness, indicating that the electric-field effect on the magnetic anisotropy originates from the modulation of CoFeB/MgO-interfacial magnetic anisotropy. A clear electric-field modulation of α is observed for the structure with t  = 1.4 nm, and almost no modulation for the structures with t  ≥ 1.5 nm.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 9
    Publication Date: 2014-08-12
    Description: Author(s): A. Bazavov, H.-T. Ding, P. Hegde, O. Kaczmarek, F. Karsch, E. Laermann, Y. Maezawa, Swagato Mukherjee, H. Ohno, P. Petreczky, C. Schmidt, S. Sharma, W. Soeldner, and M. Wagner Unobserved hadrons - specifically those made of strange quarks - provide insight into lattice QCD calculations near the Quark Gluon Plasma phase transition. [Phys. Rev. Lett. 113, 072001] Published Mon Aug 11, 2014
    Keywords: Elementary Particles and Fields
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 10
    Publication Date: 2013-11-15
    Description: Gut commensal microbes shape the mucosal immune system by regulating the differentiation and expansion of several types of T cell. Clostridia, a dominant class of commensal microbe, can induce colonic regulatory T (Treg) cells, which have a central role in the suppression of inflammatory and allergic responses. However, the molecular mechanisms by which commensal microbes induce colonic Treg cells have been unclear. Here we show that a large bowel microbial fermentation product, butyrate, induces the differentiation of colonic Treg cells in mice. A comparative NMR-based metabolome analysis suggests that the luminal concentrations of short-chain fatty acids positively correlates with the number of Treg cells in the colon. Among short-chain fatty acids, butyrate induced the differentiation of Treg cells in vitro and in vivo, and ameliorated the development of colitis induced by adoptive transfer of CD4(+) CD45RB(hi) T cells in Rag1(-/-) mice. Treatment of naive T cells under the Treg-cell-polarizing conditions with butyrate enhanced histone H3 acetylation in the promoter and conserved non-coding sequence regions of the Foxp3 locus, suggesting a possible mechanism for how microbial-derived butyrate regulates the differentiation of Treg cells. Our findings provide new insight into the mechanisms by which host-microbe interactions establish immunological homeostasis in the gut.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Furusawa, Yukihiro -- Obata, Yuuki -- Fukuda, Shinji -- Endo, Takaho A -- Nakato, Gaku -- Takahashi, Daisuke -- Nakanishi, Yumiko -- Uetake, Chikako -- Kato, Keiko -- Kato, Tamotsu -- Takahashi, Masumi -- Fukuda, Noriko N -- Murakami, Shinnosuke -- Miyauchi, Eiji -- Hino, Shingo -- Atarashi, Koji -- Onawa, Satoshi -- Fujimura, Yumiko -- Lockett, Trevor -- Clarke, Julie M -- Topping, David L -- Tomita, Masaru -- Hori, Shohei -- Ohara, Osamu -- Morita, Tatsuya -- Koseki, Haruhiko -- Kikuchi, Jun -- Honda, Kenya -- Hase, Koji -- Ohno, Hiroshi -- England -- Nature. 2013 Dec 19;504(7480):446-50. doi: 10.1038/nature12721. Epub 2013 Nov 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan [3]. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan [3] Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan [4]. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] Institute for Advanced Biosciences, Keio University, Yamagata 997-0052, Japan [3]. ; RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan. ; Institute for Advanced Biosciences, Keio University, Yamagata 997-0052, Japan. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] Graduate School of Medical Life Science, Yokohama City University, Kanagawa 230-0045, Japan. ; Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan. ; The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan. ; Preventative Health National Research Flagship, CSIRO Food and Nutritional Sciences, South Australia 5000, Australia. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan [3] Graduate School of Medical Life Science, Yokohama City University, Kanagawa 230-0045, Japan. ; 1] Graduate School of Medical Life Science, Yokohama City University, Kanagawa 230-0045, Japan [2] RIKEN Center for Sustainable Resource Science, Kanagawa 230-0045, Japan. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan. ; 1] RIKEN Center for Integrative Medical Sciences (IMS-RCAI), Kanagawa 230-0045, Japan [2] The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan [3] PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan [4].〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24226770" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylation/drug effects ; Adoptive Transfer ; Animals ; Butyrates/analysis/*metabolism/pharmacology ; *Cell Differentiation/drug effects ; Colitis/drug therapy/pathology ; Colon/cytology/*immunology/metabolism/*microbiology ; Conserved Sequence ; Female ; *Fermentation ; Forkhead Transcription Factors/genetics ; Germ-Free Life ; Histones/metabolism ; Homeostasis/drug effects ; Intestinal Mucosa/cytology/immunology ; Lymphocyte Count ; Magnetic Resonance Spectroscopy ; Male ; Metabolome ; Mice ; Promoter Regions, Genetic/drug effects ; *Symbiosis ; T-Lymphocytes, Regulatory/*cytology/drug effects/immunology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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