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Hasegawa T, Utsunomiya A, Chino T, Kasamatsu H, Shimizu T, Matsushita T, Obara T, Ishii N, Ogasawara H, Ikeda W, Imai T, Oyama N, Hasegawa M. Anti-CX3CL1 (fractalkine) monoclonal antibody attenuates lung and skin fibrosis in sclerodermatous graft-versus-host disease mouse model. Arthritis Res Ther 2024; 26:94. [PMID: 38702742 PMCID: PMC11067205 DOI: 10.1186/s13075-024-03307-8] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 03/10/2024] [Indexed: 05/06/2024] Open
Abstract
BACKGROUND Systemic sclerosis (SSc) is an autoimmune disease characterized by vascular injury and inflammation, followed by excessive fibrosis of the skin and other internal organs, including the lungs. CX3CL1 (fractalkine), a chemokine expressed on endothelial cells, supports the migration of macrophages and T cells that express its specific receptor CX3CR1 into targeted tissues. We previously reported that anti-CX3CL1 monoclonal antibody (mAb) treatment significantly inhibited transforming growth factor (TGF)-β1-induced expression of type I collagen and fibronectin 1 in human dermal fibroblasts. Additionally, anti-mouse CX3CL1 mAb efficiently suppressed skin inflammation and fibrosis in bleomycin- and growth factor-induced SSc mouse models. However, further studies using different mouse models of the complex immunopathology of SSc are required before the initiation of a clinical trial of CX3CL1 inhibitors for human SSc. METHODS To assess the preclinical utility and functional mechanism of anti-CX3CL1 mAb therapy in skin and lung fibrosis, a sclerodermatous chronic graft-versus-host disease (Scl-cGVHD) mouse model was analyzed with immunohistochemical staining for characteristic infiltrating cells and RNA sequencing assays. RESULTS On day 42 after bone marrow transplantation, Scl-cGVHD mice showed increased serum CX3CL1 level. Intraperitoneal administration of anti-CX3CL1 mAb inhibited the development of fibrosis in the skin and lungs of Scl-cGVHD model, and did not result in any apparent adverse events. The therapeutic effects were correlated with the number of tissue-infiltrating inflammatory cells and α-smooth muscle actin (α-SMA)-positive myofibroblasts. RNA sequencing analysis of the fibrotic skin demonstrated that cGVHD-dependent induction of gene sets associated with macrophage-related inflammation and fibrosis was significantly downregulated by mAb treatment. In the process of fibrosis, mAb treatment reduced cGVHD-induced infiltration of macrophages and T cells in the skin and lungs, especially those expressing CX3CR1. CONCLUSIONS Together with our previous findings in other SSc mouse models, the current results indicated that anti-CX3CL1 mAb therapy could be a rational therapeutic approach for fibrotic disorders, such as human SSc and Scl-cGVHD.
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Affiliation(s)
- Takumi Hasegawa
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Akira Utsunomiya
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Takenao Chino
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Hiroshi Kasamatsu
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Tomomi Shimizu
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Takashi Matsushita
- Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, 920-8641, Japan
| | | | - Naoto Ishii
- KAN Research Institute, Inc, Kobe, Hyogo, 650-0047, Japan
| | | | - Wataru Ikeda
- KAN Research Institute, Inc, Kobe, Hyogo, 650-0047, Japan
- IDDK Co., Ltd, Tokyo, 135-0047, Japan
| | - Toshio Imai
- KAN Research Institute, Inc, Kobe, Hyogo, 650-0047, Japan
- Advanced Therapeutic Target Discovery, Department of Gastroenterology, Kobe University Graduate School of Medicine, Kobe, Hyogo, 650-0047, Japan
| | - Noritaka Oyama
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan
| | - Minoru Hasegawa
- Department of Dermatology, Division of Medicine, Faculty of Medical Sciences, University of Fukui, Fukui, 910-1193, Japan.
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Procter TD, Ogasawara H, Spruin S, Wijayasri S, Abraham N, Blaser C, Hutchings K, Shaw A, Ogunnaike-Cooke S. Thrombosis with thrombocytopenia syndrome (TTS) following adenovirus vector COVID-19 vaccination in Canada. Vaccine 2023:S0264-410X(23)01159-3. [PMID: 37806804 DOI: 10.1016/j.vaccine.2023.09.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 09/01/2023] [Accepted: 09/29/2023] [Indexed: 10/10/2023]
Abstract
INTRODUCTION Identifying and monitoring adverse events following vaccination contributed to the safety and effectiveness of COVID-19 mass vaccination campaigns. In March 2021, international reports emerged of an adverse event following vaccination with adenovirus vector COVID-19 vaccines (ChAdOx1-S [recombinant] and Ad26.COV2.S) of thrombosis with low platelet counts, referred to as thrombosis with thrombocytopenia syndrome (TTS). We described TTS reports in Canada following adenovirus vector COVID-19 vaccines and investigated whether the observed number of events were higher than expected. METHODS Reports of TTS following receipt of ChAdOx1-S [recombinant] or Ad26.COV2.S meeting the Canadian case definition for TTS and diagnostic certainty levels 1-3 of the Brighton Collaboration case definition, submitted to the Canadian Adverse Events Following Immunization Surveillance System and Canada Vigilance Database between February 26, 2021 and October 31, 2022 were included. Demographics and characteristics of the TTS reports are described along with an analysis comparing the observed number of reports to the expected number. RESULTS As of October 31, 2022, 56 reports of TTS following administration of ChAdOx1-S [recombinant] and no reports following Ad26.COV2.S vaccines were reported in Canada, of which 37 had functionally positive anti-PF4 antibodies. The median age was 56 years; males accounted for 54 % of reports. Five deaths were reported. The observed number of reports exceeded the expected for all ages and sexes combined, as well as for males aged 30-49 and 60-69 years, and females aged 40-59 years. CONCLUSION Based on international surveillance data, Canada evaluated a statistical signal of TTS following adenovirus vector vaccines. The investigation of this signal demonstrated how post-market vaccine safety surveillance systems were successful in investigating rare adverse events during the rollout of COVID-19 vaccines in Canada. As adenovirus vector vaccines continue to be administered, characterization of the association between the vaccine and TTS informs immunization programs and policies.
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Affiliation(s)
- T D Procter
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada.
| | - H Ogasawara
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - S Spruin
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - S Wijayasri
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - N Abraham
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - C Blaser
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - K Hutchings
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - A Shaw
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
| | - S Ogunnaike-Cooke
- Centre for Immunization Surveillance, Public Health Agency of Canada, Ottawa, ON, Canada
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Motoi S, Uesugi M, Obara T, Moriya K, Arita Y, Ogasawara H, Soejima M, Imai T, Kawano T. Serum APOA4 Pharmacodynamically Represents Administered Recombinant Human Hepatocyte Growth Factor (E3112). Int J Mol Sci 2021; 22:4578. [PMID: 33925510 PMCID: PMC8123842 DOI: 10.3390/ijms22094578] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 04/22/2021] [Accepted: 04/22/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Hepatocyte growth factor (HGF) is an endogenously induced bioactive molecule that has strong anti-apoptotic and tissue repair activities. In this research, we identified APOA4 as a novel pharmacodynamic (PD) marker of the recombinant human HGF (rh-HGF), E3112. METHODS rh-HGF was administered to mice, and their livers were investigated for the PD marker. Candidates were identified from soluble proteins and validated by using human hepatocytes in vitro and an animal disease model in vivo, in which its c-Met dependency was also ensured. RESULTS Among the genes induced or highly enhanced after rh-HGF exposure in vivo, a soluble apolipoprotein, Apoa4, was found to be induced by rh-HGF in the murine liver. By using primary cultured human hepatocytes, the significant induction of human APOA4 was observed at the mRNA and protein levels, and it was inhibited in the presence of a c-Met inhibitor. Although mice constitutively expressed Apoa4 mRNA in the small intestine and the liver, the liver was the primary organ affected by administered rh-HGF to strongly induce APOA4 in a dose- and c-Met-dependent manner. Serum APOA4 levels were increased after rh-HGF administration, not only in normal mice but also in anti-Fas-induced murine acute liver failure (ALF), which confirmed the pharmacodynamic nature of APOA4. CONCLUSIONS APOA4 was identified as a soluble PD marker of rh-HGF with c-Met dependency. It should be worthwhile to clinically validate its utility through clinical trials with healthy subjects and ALF patients.
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Affiliation(s)
- Sotaro Motoi
- Eisai Product Creation Systems, KAN Product Creation Unit, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 3002635, Japan; (S.M.); (M.S.)
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Mai Uesugi
- Medicine Creation, Neurology Business Group, Translational Medicine Department, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 3002635, Japan; (M.U.); (T.O.)
| | - Takashi Obara
- Medicine Creation, Neurology Business Group, Translational Medicine Department, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 3002635, Japan; (M.U.); (T.O.)
| | - Katsuhiro Moriya
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Yoshihisa Arita
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Hideaki Ogasawara
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Motohiro Soejima
- Eisai Product Creation Systems, KAN Product Creation Unit, Eisai Co., Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 3002635, Japan; (S.M.); (M.S.)
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Toshio Imai
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
| | - Tetsu Kawano
- KAN Research Institute, Inc., 6-8-2 Minatojima-Minamimachi, Chuo-Ku, Kobe, Hyogo 6500047, Japan; (K.M.); (Y.A.); (H.O.); (T.I.)
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Ito D, Taguchi R, Deguchi M, Ogasawara H, Inoue E. Extensive splicing changes in an ALS/FTD transgenic mouse model overexpressing cytoplasmic fused in sarcoma. Sci Rep 2020; 10:4857. [PMID: 32184412 PMCID: PMC7078223 DOI: 10.1038/s41598-020-61676-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 02/13/2020] [Indexed: 12/13/2022] Open
Abstract
Mutations in RNA-binding proteins (RBPs) such as TAR DNA-binding protein 43 (TDP-43) and fused in sarcoma (FUS) are associated with amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). Recent evidence suggests that RNA dysregulation mediated by aberrant RBPs may play a critical role in neurodegeneration, but the underlying molecular mechanisms are largely unknown. In this study, we performed whole transcriptome profiling of various brain tissues of a transgenic (Tg) mouse model of ALS/FTD overexpressing the exogenous nuclear localization signal deletion mutant of human FUS (ΔNLS-FUS) to investigate changes associated with the early stages of ALS/FTD. Although there were not many differences in expression profiles between wild-type and Tg mice, we found that Sema3g was significantly upregulated in the frontal cortex and hippocampus of Tg mice. Interestingly, analysis of alternative splicing events identified widespread exons that were differentially regulated in Tg mice in a tissue-specific manner. Our study thus identified aberrant splicing regulation mediated by mutant FUS during the early stages of ALS/FTD. Targeting this aberrant splicing regulation represents a potential therapeutic strategy for ALS/FTD.
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Affiliation(s)
- Daisuke Ito
- Departments of Neurology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan.
| | - Ryota Taguchi
- KAN Research Institute, Inc., 6-8-2 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
| | - Maki Deguchi
- KAN Research Institute, Inc., 6-8-2 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
| | - Hideaki Ogasawara
- KAN Research Institute, Inc., 6-8-2 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
| | - Eiji Inoue
- KAN Research Institute, Inc., 6-8-2 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
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Luong VH, Utsunomiya A, Chino T, Doanh LH, Matsushita T, Obara T, Kuboi Y, Ishii N, Machinaga A, Ogasawara H, Ikeda W, Kawano T, Imai T, Oyama N, Hasegawa M. Inhibition of the Progression of Skin Inflammation, Fibrosis, and Vascular Injury by Blockade of the CX 3 CL1/CX 3 CR1 Pathway in Experimental Mouse Models of Systemic Sclerosis. Arthritis Rheumatol 2019; 71:1923-1934. [PMID: 31173491 DOI: 10.1002/art.41009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 06/04/2019] [Indexed: 12/24/2022]
Abstract
OBJECTIVE To assess the preclinical efficacy and mechanism of action of an anti-CX3 CL1 monoclonal antibody (mAb) in systemic sclerosis (SSc). METHODS Cultured human dermal fibroblasts were used to evaluate the direct effect of anti-CX3 CL1 mAb on fibroblasts. In addition, bleomycin-induced and growth factor-induced models of SSc were used to investigate the effect of anti-CX3 CL1 mAb on leukocyte infiltration, collagen deposition, and vascular damage in the skin. RESULTS Anti-CX3 CL1 mAb treatment significantly inhibited Smad3 phosphorylation (P < 0.05) and expression of type I collagen and fibronectin 1 (P < 0.01) in dermal fibroblasts stimulated with transforming growth factor β1 (TGFβ1). In the bleomycin model, daily subcutaneous bleomycin injection increased serum CX3 CL1 levels (P < 0.05) and augmented lesional CX3 CL1 expression. Simultaneous administration of anti-CX3 CL1 mAb or CX3 CR1 deficiency significantly suppressed the dermal thickness, collagen content, and capillary loss caused by bleomycin (P < 0.05). Injection of bleomycin induced expression of pSmad3 and TGFβ1 in the skin, which was inhibited by anti-CX3 CL1 mAb. Further, the dermal infiltration of CX3 CR1+ cells, macrophages (inflammatory and alternatively activated [M2-like] subsets), and CD3+ cells significantly decreased following anti-CX3 CL1 mAb therapy (P < 0.05), as did the enhanced skin expression of fibrogenic molecules, such as thymic stromal lymphopoietin and secreted phosphoprotein 1 (P < 0.05). However, the treatment did not significantly reduce established skin fibrosis. In the second model, simultaneous anti-mCX3 CL1 mAb therapy significantly diminished the skin fibrosis induced by serial subcutaneous injection of TGFβ and connective tissue growth factor (P < 0.01). CONCLUSION Anti-CX3 CL1 mAb therapy may be a novel approach for treating early skin fibrosis in inflammation-driven fibrotic skin disorders such as SSc.
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Affiliation(s)
- Vu H Luong
- University of Fukui, Fukui, Japan, and Hanoi Medical University, Hanoi, Vietnam
| | | | | | - Le H Doanh
- Hanoi Medical University, Hanoi, Vietnam
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6
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Hasegawa M, Luong V, Utsunomiya A, Chino T, Oyama N, Matsushita T, Obara T, Kuboi Y, Ishii N, Machinaga A, Ogasawara H, Ikeda W, Imai T. LB1141 Anti-mouse CX3CL1 monoclonal antibody therapy in mouse models of systemic sclerosis. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.06.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Kuboi Y, Nishimura M, Ikeda W, Nakatani T, Seki Y, Yamaura Y, Ogawa K, Hamaguchi A, Muramoto K, Mizuno K, Ogasawara H, Yamauchi T, Yasuda N, Onodera H, Imai T. Blockade of the fractalkine-CX3CR1 axis ameliorates experimental colitis by dislodging venous crawling monocytes. Int Immunol 2019; 31:357. [PMID: 31002334 DOI: 10.1093/intimm/dxz035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yoshikazu Kuboi
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan.,Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | - Miyuki Nishimura
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Wataru Ikeda
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Tomoya Nakatani
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Yukie Seki
- Research Institute, EA Pharma Co., Ltd., Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa, Japan
| | - Yui Yamaura
- Research Institute, EA Pharma Co., Ltd., Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa, Japan
| | - Kana Ogawa
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Akiko Hamaguchi
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Kenzo Muramoto
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan.,Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan.,Medical Communication Section, Medical Division, Eisai Co., Ltd., Bunkyo-ku, Tokyo, Japan
| | - Keiko Mizuno
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Hideaki Ogasawara
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
| | - Toshihiko Yamauchi
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan.,Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | - Nobuyuki Yasuda
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan.,Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | - Hiroshi Onodera
- Photon Science Center of the University of Tokyo, Department of Electrical Engineering and Information System, Graduate School of Engineering, Bunkyo-ku, Tokyo, Japan
| | - Toshio Imai
- KAN Research Institute Inc., Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, Japan
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8
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Kuboi Y, Nishimura M, Ikeda W, Nakatani T, Seki Y, Yamaura Y, Ogawa K, Hamaguchi A, Muramoto K, Mizuno K, Ogasawara H, Yamauchi T, Yasuda N, Onodera H, Imai T. Blockade of the fractalkine–CX3CR1 axis ameliorates experimental colitis by dislodging venous crawling monocytes. Int Immunol 2019; 31:287-302. [DOI: 10.1093/intimm/dxz006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 01/17/2019] [Indexed: 12/12/2022] Open
Affiliation(s)
- Yoshikazu Kuboi
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
- Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | | | - Wataru Ikeda
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
| | | | - Yukie Seki
- Research Institute, EA Pharma Co., Ltd., Kawasaki-ku, Kawasaki-shi, Kanagawa, Japan
| | - Yui Yamaura
- Research Institute, EA Pharma Co., Ltd., Kawasaki-ku, Kawasaki-shi, Kanagawa, Japan
| | - Kana Ogawa
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
| | | | - Kenzo Muramoto
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
- Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
- Medical Communication Section, Medical Division, Eisai Co., Ltd., Bunkyo-ku, Tokyo, Japan
| | - Keiko Mizuno
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
| | | | - Toshihiko Yamauchi
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
- Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | - Nobuyuki Yasuda
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
- Tsukuba Research Laboratories, Eisai Co., Ltd., Tsukuba, Ibaraki, Japan
| | - Hiroshi Onodera
- Photon Science Center of the University of Tokyo, Department of Electrical Engineering and Information System, Graduate School of Engineering, Bunkyo-ku, Tokyo, Japan
| | - Toshio Imai
- KAN Research Institute Inc., Chuo-ku, Kobe, Hyogo, Japan
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Muroya S, Ogasawara H, Nohara K, Oe M, Ojima K, Hojito M. PSVII-25 Grazing-induced transcriptomic changes in bovine biceps femoris muscle, subcutaneous fat, and liver mRNAs and plasma exosome microRNAs. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.783] [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)
- S Muroya
- Institute of Livestock and Grassland Science, NARO, Tsukuba, Ibaraki, Japan
| | | | - K Nohara
- Kitasato University,Hokkaido, Japan
| | - M Oe
- Institute of Livestock and Grassland Science, NARO, Tsukuba, Ibaraki, Japan
| | - K Ojima
- Institute of Livestock and Grassland Science, NARO, Tsukuba, Ibaraki, Japan
| | - M Hojito
- Kitasato University,Hokkaido, Japan
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Tatemoto K, Nozaki Y, Tsuda R, Kaneko S, Tomura K, Furuno M, Ogasawara H, Edamura K, Takagi H, Iwamura H, Noguchi M, Naito T. Endogenous protein and enzyme fragments induce immunoglobulin E-independent activation of mast cells via a G protein-coupled receptor, MRGPRX2. Scand J Immunol 2018; 87:e12655. [PMID: 29484687 DOI: 10.1111/sji.12655] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 02/20/2018] [Indexed: 12/31/2022]
Abstract
Mast cells play a central role in inflammatory and allergic reactions by releasing inflammatory mediators through 2 main pathways, immunoglobulin E-dependent and E-independent activation. In the latter pathway, mast cells are activated by a diverse range of basic molecules (collectively known as basic secretagogues) through Mas-related G protein-coupled receptors (MRGPRs). In addition to the known basic secretagogues, here, we discovered several endogenous protein and enzyme fragments (such as chaperonin-10 fragment) that act as bioactive peptides and induce immunoglobulin E-independent mast cell activation via MRGPRX2 (previously known as MrgX2), leading to the degranulation of mast cells. We discuss the possibility that MRGPRX2 responds various as-yet-unidentified endogenous ligands that have specific characteristics, and propose that MRGPRX2 plays an important role in regulating inflammatory responses to endogenous harmful stimuli, such as protein breakdown products released from damaged or dying cells.
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Affiliation(s)
- K Tatemoto
- Department of Molecular Physiology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Y Nozaki
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - R Tsuda
- Department of Molecular Physiology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - S Kaneko
- Department of Molecular Physiology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - K Tomura
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - M Furuno
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - H Ogasawara
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - K Edamura
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - H Takagi
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - H Iwamura
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - M Noguchi
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
| | - T Naito
- Pharmaceutical Frontier Research Laboratories, Japan Tobacco Inc., Yokohama, Japan
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11
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Ohno K, Manjanath A, Kawazoe Y, Hatakeyama R, Misaizu F, Kwon E, Fukumura H, Ogasawara H, Yamada Y, Zhang C, Sumi N, Kamigaki T, Kawachi K, Yokoo K, Ono S, Kasama Y. Extensive first-principles molecular dynamics study on Li encapsulation into C 60 and its experimental confirmation. Nanoscale 2018; 10:1825-1836. [PMID: 29308793 DOI: 10.1039/c7nr07237f] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The aim of increasing the production ratio of endohedral C60 by impinging foreign atoms against C60 is a crucial matter of the science and technology employed towards industrialization of these functional building block materials. Among these endohedral fullerenes, Li+@C60 exhibits a wide variety of physical and chemical phenomena and has the potential to be applicable in areas spanning the medical field to photovoltaics. However, currently, Li+@C60 can be experimentally produced with only ∼1% ratio using the plasma shower method with a 30 eV kinetic energy provided to the impinging Li+ ion. From extensive first-principles molecular dynamics simulations, it is found that the maximum production ratio of Li+@C60 per hit is increased to about 5.1% (5.3%) when a Li+ ion impinges vertically on a six-membered ring of C60 with 30 eV (40 eV) kinetic energy, although many C60 molecules are damaged during this collision. On the contrary, when it impinges vertically on a six-membered ring with 10 eV kinetic energy, the production ratio remains at 1.3%, but the C60 molecules are not damaged at all. On the other hand, when the C60 is randomly oriented, the production ratio reduces to about 3.7 ± 0.5%, 3.3 ± 0.5%, and 0.2 ± 0.03% for 30 eV, 40 eV, and 10 eV kinetic energy, respectively. Based on these observations we demonstrate the possibility of increasing the production ratio by fixing six-membered rings atop C60 using the Cu(111) substrate or UV light irradiation. In order to assess the ideal experimental production ratio, the 7Li solid NMR spectroscopy measurement is also performed for the multilayer randomly oriented C60 sample irradiated by Li+ using the plasma shower method combined with inductively coupled plasma atomic emission spectroscopy (ICP-AES). Time-of-flight mass spectroscopy measurements are also performed to cross check whether Li+@C60 molecules are produced in the sample. The resulting experimental estimate, 4% for 30 eV incident kinetic energy, fully agrees with our simulation results mentioned above, suggesting the consistency and accuracy of our simulations and experiments.
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Affiliation(s)
- K Ohno
- Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - A Manjanath
- Department of Physics, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
| | - Y Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, 6-6-4 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan and Department of Physics and Nanotechnology, SRM University, Kattankulathur 603203, Tamil Nadu, India
| | - R Hatakeyama
- Department of Electronic Engineering, Tohoku University, 6-6-5 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - F Misaizu
- New Industry Creation Hatchery Center, Tohoku University, 6-6-4 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan and Department of Chemistry, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - E Kwon
- New Industry Creation Hatchery Center, Tohoku University, 6-6-4 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan and Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - H Fukumura
- Department of Chemistry, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - H Ogasawara
- Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Y Yamada
- Division of Applied Physics, University of Tsukuba, 1-1-1 Ten'nodai, Tsukuba, Ibaraki 305-8573, Japan
| | - C Zhang
- Division of Applied Physics, University of Tsukuba, 1-1-1 Ten'nodai, Tsukuba, Ibaraki 305-8573, Japan
| | - N Sumi
- Division of Applied Physics, University of Tsukuba, 1-1-1 Ten'nodai, Tsukuba, Ibaraki 305-8573, Japan
| | - T Kamigaki
- Idea International Corporation, 1-15-35 Sagigamori, Aoba-ku, Sendai 981-0922, Japan
| | - K Kawachi
- Idea International Corporation, 1-15-35 Sagigamori, Aoba-ku, Sendai 981-0922, Japan
| | - K Yokoo
- Idea International Corporation, 1-15-35 Sagigamori, Aoba-ku, Sendai 981-0922, Japan
| | - S Ono
- Idea International Corporation, 1-15-35 Sagigamori, Aoba-ku, Sendai 981-0922, Japan
| | - Y Kasama
- Idea International Corporation, 1-15-35 Sagigamori, Aoba-ku, Sendai 981-0922, Japan
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12
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Sato H, Muraoka S, Kusunoki N, Masuoka S, Yamada S, Ogasawara H, Imai T, Akasaka Y, Tochigi N, Takahashi H, Tsuchiya K, Kawai S, Nanki T. Resistin upregulates chemokine production by fibroblast-like synoviocytes from patients with rheumatoid arthritis. Arthritis Res Ther 2017; 19:263. [PMID: 29191223 PMCID: PMC5709830 DOI: 10.1186/s13075-017-1472-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [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: 09/11/2017] [Accepted: 11/13/2017] [Indexed: 02/05/2023] Open
Abstract
Background Adipokines are bioactive hormones secreted by adipose tissues. Resistin, an adipokine, plays important roles in the regulation of insulin resistance and inflammation. Resistin levels are known to be increased in the serum and synovial fluid of rheumatoid arthritis (RA) patients. However, the pathogenic role of resistin in RA has not yet been elucidated. Methods The expression of resistin and adenylate cyclase-associated protein 1 (CAP1), a receptor for resistin, was examined immunohistochemically in synovial tissue. CAP1 expression in in vitro cultured fibroblast-like synoviocytes (FLSs) was assessed with a reverse transcription-polymerase chain reaction (PCR) and western blotting. The gene expression of resistin-stimulated FLSs was evaluated by RNA sequencing (RNA-Seq) and quantitative real-time PCR. Concentrations of chemokine (C-X-C motif) ligand (CXCL) 8, chemokine (C-C motif) ligand (CCL) 2, interleukin (IL)-1β, IL-6 and IL-32 in culture supernatants were measured by enzyme-linked immunosorbent assay. Small interfering RNA (siRNA) for CAP1 was transfected into FLSs in order to examine inhibitory effects. Results The expression of resistin and CAP1 in synovial tissue was stronger in RA than in osteoarthritis (OA). Resistin was expressed by macrophages in the RA synovium, while CAP1 was expressed by macrophages, FLSs and endothelial cells. In vitro cultured RA FLSs also expressed CAP1. RNA-Seq revealed that the expression levels of 18 molecules were more than twofold higher in resistin-stimulated FLSs than in unstimulated FLSs. Seven chemokines, CXCL1, CXCL2, CXCL3, CXCL5, CXCL6, CXCL8, and CCL2, were included among the 18 molecules. Increases induced in the expression of CXCL1, CXCL8, and CCL2 by the resistin stimulation were confirmed by real-time PCR. The stimulation with resistin increased the protein levels of CXCL8 and CCL2 produced by RA FLSs, and the upregulated expression of CXCL8 was inhibited by the abrogation of CAP1 by siRNA for CAP1. Production of IL-6 by FLSs was also increased by resistin. Expression of IL-1β and IL-32 was not detected by ELISA. Conclusions Resistin contributes to the pathogenesis of RA by increasing chemokine production by FLSs via CAP1 in synovial tissue.
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Affiliation(s)
- Hiroshi Sato
- Department of Internal Medicine, Graduate School of Medicine, Toho University, Tokyo, Japan.,Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Sei Muraoka
- Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Natsuko Kusunoki
- Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Shotaro Masuoka
- Department of Internal Medicine, Graduate School of Medicine, Toho University, Tokyo, Japan.,Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Soichi Yamada
- Department of Internal Medicine, Graduate School of Medicine, Toho University, Tokyo, Japan.,Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan
| | - Hideaki Ogasawara
- KAN Research Institute Inc, 6-8-2 Minatojima-minamimachi, Chuo-Ku, Kobe, 650-0047, Japan
| | - Toshio Imai
- KAN Research Institute Inc, 6-8-2 Minatojima-minamimachi, Chuo-Ku, Kobe, 650-0047, Japan
| | - Yoshikiyo Akasaka
- Unit of Regenerative Diseases Research, Division of Research Promotion and Development, Advanced Medical Research Center, Toho University Graduate School of Medicine, Tokyo, Japan
| | - Naobumi Tochigi
- Department of Surgical Pathology, Toho University School of Medicine, Tokyo, Japan
| | - Hiroshi Takahashi
- Department of Orthopedic Surgery, Toho University School of Medicine, Tokyo, Japan
| | - Kazuaki Tsuchiya
- Department of Orthopedic Surgery, Toho University School of Medicine, Tokyo, Japan
| | - Shinichi Kawai
- Department of Inflammation and Pain Control Research, Toho University School of Medicine, Tokyo, Japan
| | - Toshihiro Nanki
- Department of Internal Medicine, Graduate School of Medicine, Toho University, Tokyo, Japan. .,Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-Nishi, Ota-ku, Tokyo, 143-8541, Japan.
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13
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LaRue J, Krejčí O, Yu L, Beye M, Ng ML, Öberg H, Xin H, Mercurio G, Moeller S, Turner JJ, Nordlund D, Coffee R, Minitti MP, Wurth W, Pettersson LGM, Öström H, Nilsson A, Abild-Pedersen F, Ogasawara H. Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru. J Phys Chem Lett 2017; 8:3820-3825. [PMID: 28759996 DOI: 10.1021/acs.jpclett.7b01549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The direct elucidation of the reaction pathways in heterogeneous catalysis has been challenging due to the short-lived nature of reaction intermediates. Here, we directly measured on ultrafast time scales the initial hydrogenation steps of adsorbed CO on a Ru catalyst surface, which is known as the bottleneck reaction in syngas and CO2 reforming processes. We initiated the hydrogenation of CO with an ultrafast laser temperature jump and probed transient changes in the electronic structure using real-time X-ray spectroscopy. In combination with theoretical simulations, we verified the formation of CHO during CO hydrogenation.
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Affiliation(s)
- J LaRue
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
- Schmid College of Science and Technology, Chapman University , One University Drive, Orange, California 92866, United States
- Fritz-Haber Institute of the Max-Planck-Society , Faradayweg 4-6, D-14195 Berlin, Germany
| | - O Krejčí
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
- Faculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University in Prague , V Holešovičkách 2, 180 00, Prague, Czech Republic
- Institute of Physics of the Czech Academy of Sciences , Cukrovarnická 10, 162 53, Prague, Czech Republic
| | - L Yu
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University , Stanford, California 95305, United States
| | - M Beye
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - M L Ng
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - H Öberg
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | - H Xin
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University , Stanford, California 95305, United States
| | - G Mercurio
- University of Hamburg and Center for Free Electron Laser Science , Luruper Chausse 149, D-22761 Hamburg, Germany
| | - S Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - D Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - R Coffee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - M P Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - W Wurth
- University of Hamburg and Center for Free Electron Laser Science , Luruper Chausse 149, D-22761 Hamburg, Germany
- DESY Photon Science , Notkestrasse 85, 22607 Hamburg, Germany
| | - L G M Pettersson
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | - H Öström
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | - A Nilsson
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | - F Abild-Pedersen
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - H Ogasawara
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
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14
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Nilsson A, LaRue J, Öberg H, Ogasawara H, Dell'Angela M, Beye M, Öström H, Gladh J, Nørskov J, Wurth W, Abild-Pedersen F, Pettersson L. Catalysis in real time using X-ray lasers. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.02.018] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Abstract
The incompressible pyrite form of group 14 elemental pernitrides synthesized at high pressures and high temperatures.
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Affiliation(s)
- K. Niwa
- Department of Materials Physics
- Nagoya University
- Nagoya
- Japan
| | - H. Ogasawara
- Department of Crystalline Materials Science
- Nagoya University
- Nagoya
- Japan
| | - M. Hasegawa
- Department of Materials Physics
- Nagoya University
- Nagoya
- Japan
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16
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Hayasaka M, Ogasawara H, Hotta Y, Tsukagoshi K, Kimura O, Kura T, Tarumi T, Muramatsu H, Endo T. Nutritional assessment using stable isotope ratios of carbon and nitrogen in the scalp hair of geriatric patients who received enteral and parenteral nutrition formulas. Clin Nutr 2016; 36:1661-1668. [PMID: 27847116 DOI: 10.1016/j.clnu.2016.10.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 10/14/2016] [Accepted: 10/17/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND & AIMS The δ13C and δ15N values in the scalp hair of geriatric patients in Japan who received the enteral or parenteral nutrition formula were measured to assess nutritional status. METHODS The relations among δ13C, δ15N, calorie intake, BMI, albumin concentration, total cholesterol (T-CHO) and geriatric nutritional risk index (GNRI) in the patients were investigated. Furthermore, the enrichment of δ13C and δ15N from the nutrients to the hair was investigated. RESULTS The δ13C values in the hair of patients who received enteral nutrition decreased with decreases in the calories received, while the δ15N values increased, suggesting malnutrition in some patients with a low calorie intake due to a negative nitrogen balance. The distribution of patients with a low calorie intake (below 20 kcal/kg/day) when δ13C was plotted against δ15N differed from that of control subjects, but the distribution of patients with a high calorie intake (above 20 kcal/kg/day) was similar to that of control subjects. No significant differences were observed in BMI, albumin concentration, T-CHO or GNRI between the low and high calorie groups. The enrichment of δ13C and δ15N from the enteral nutrients to the hair were inversely correlated with the δ13C and δ15N in the enteral nutrients. The enrichment levels of δ13C and δ15N tended to be higher and lower, respectively, in the high calorie group. On the other hand, the δ13C and δ15N values in the hair of patients who received parenteral nutrition were higher and lower than those in the control subjects and in the patients who received enteral nutrition, respectively, reflecting the higher δ13C and lower δ15N contents of the parenteral nutrients. CONCLUSIONS The δ13C and δ15N values in the hair of patients who received enteral nutrition may be effective indicators for evaluating the long-term nutritional status of geriatric patients. A calorie intake of 20 kcal/kg/day may be a cut-off value for malnutrition in Japanese geriatric patients receiving enteral nutrition. However, caution is necessary when dealing with patients switching from parental nutrition as parenteral nutrition resulted in different changes in δ13C and δ15N. The enrichment levels of δ13C and δ15N from the enteral nutrients to the hair may be inversely correlated with the δ13C and δ15N values of enteral nutrients and vary according to the calorie intake.
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Affiliation(s)
- M Hayasaka
- Sapporo Higashi-Tokushukai Hospital, N33-E14, Higashi-ku, Sapporo, Hokkaido 065-0033, Japan
| | - H Ogasawara
- Sapporo Minami-Seishu Hospital, 1-2-20, Satozuka, Kiyota-Ku, Sapporo, Hokkaido 004-0801, Japan
| | - Y Hotta
- Hokusei Hospital, W3-2-10, Sinkawa, Kita-Ku, Sapporo, Hokkaido 001-0933, Japan
| | - K Tsukagoshi
- Hijirigaoka Hospital, 214-22, Funaoka, Date, Hokkaido 052-0014, Japan
| | - O Kimura
- School of Pharmaceutical Science, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
| | - T Kura
- Naganuma Municipal Hospital, 2-2-1 Chuo, Naganuma, Yubari, Hokkaido 069-1332, Japan
| | - T Tarumi
- Hokusei Hospital, W3-2-10, Sinkawa, Kita-Ku, Sapporo, Hokkaido 001-0933, Japan
| | - H Muramatsu
- Rumoi City Hospital, 2-16 Shinonome, Rumoi, Hokkaido 077-8511, Japan
| | - T Endo
- School of Pharmaceutical Science, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
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17
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Ogasawara H. Matching pseudocounts for interval estimation of binomial and Poisson parameters. COMMUN STAT-THEOR M 2016. [DOI: 10.1080/03610926.2014.941492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- H. Ogasawara
- Department of Information and Management Science, Otaru University of Commerce, Otaru, Japan
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18
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Kataoka K, Nagata Y, Kitanaka A, Shiraishi Y, Shimamura T, Yasunaga JI, Totoki Y, Chiba K, Sato-Otsubo A, Nagae G, Ishii R, Muto S, Kotani S, Watatani Y, Takeda J, Sanada M, Tanaka H, Suzuki H, Sato Y, Shiozawa Y, Yoshizato T, Yoshida K, Makishima H, Iwanaga M, Ma G, Nosaka K, Hishizawa M, Itonaga H, Imaizumi Y, Munakata W, Ogasawara H, Sato T, Sasai K, Muramoto K, Penova M, Kawaguchi T, Nakamura H, Hama N, Shide K, Kubuki Y, Hidaka T, Kameda T, Nakamaki T, Ishiyama K, Miyawaki S, Yoon SS, Tobinai K, Miyazaki Y, Takaori-Kondo A, Matsuda F, Takeuchi K, Nureki O, Aburatani H, Watanabe T, Shibata T, Matsuoka M, Miyano S, Shimoda K, Ogawa S. Integrated molecular analysis of adult T cell leukemia/lymphoma. Nat Genet 2015; 47:1304-15. [PMID: 26437031 DOI: 10.1038/ng.3415] [Citation(s) in RCA: 575] [Impact Index Per Article: 63.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 09/09/2015] [Indexed: 12/11/2022]
Abstract
Adult T cell leukemia/lymphoma (ATL) is a peripheral T cell neoplasm of largely unknown genetic basis, associated with human T cell leukemia virus type-1 (HTLV-1) infection. Here we describe an integrated molecular study in which we performed whole-genome, exome, transcriptome and targeted resequencing, as well as array-based copy number and methylation analyses, in a total of 426 ATL cases. The identified alterations overlap significantly with the HTLV-1 Tax interactome and are highly enriched for T cell receptor-NF-κB signaling, T cell trafficking and other T cell-related pathways as well as immunosurveillance. Other notable features include a predominance of activating mutations (in PLCG1, PRKCB, CARD11, VAV1, IRF4, FYN, CCR4 and CCR7) and gene fusions (CTLA4-CD28 and ICOS-CD28). We also discovered frequent intragenic deletions involving IKZF2, CARD11 and TP73 and mutations in GATA3, HNRNPA2B1, GPR183, CSNK2A1, CSNK2B and CSNK1A1. Our findings not only provide unique insights into key molecules in T cell signaling but will also guide the development of new diagnostics and therapeutics in this intractable tumor.
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Affiliation(s)
- Keisuke Kataoka
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yasunobu Nagata
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akira Kitanaka
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Yuichi Shiraishi
- Laboratory of DNA Information Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Teppei Shimamura
- Division of Systems Biology, Center for Neurological Disease and Cancer, Graduate School of Medicine, Nagoya University, Nagoya, Japan
| | - Jun-Ichirou Yasunaga
- Laboratory of Virus Control, Institute for Virus Research, Kyoto University, Kyoto, Japan
| | - Yasushi Totoki
- Division of Cancer Genomics, National Cancer Center Research Institute, Tokyo, Japan
| | - Kenichi Chiba
- Laboratory of DNA Information Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Aiko Sato-Otsubo
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Genta Nagae
- Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Ryohei Ishii
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Satsuki Muto
- Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Shinichi Kotani
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yosaku Watatani
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - June Takeda
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masashi Sanada
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Advanced Diagnosis, Clinical Research Center, Nagoya Medical Center, Nagoya, Japan
| | - Hiroko Tanaka
- Laboratory of DNA Information Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Hiromichi Suzuki
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yusuke Sato
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yusuke Shiozawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tetsuichi Yoshizato
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kenichi Yoshida
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hideki Makishima
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masako Iwanaga
- Department of Frontier Life Science, Nagasaki University Graduate School of Biomedical Science, Nagasaki, Japan
| | - Guangyong Ma
- Laboratory of Virus Control, Institute for Virus Research, Kyoto University, Kyoto, Japan
| | - Kisato Nosaka
- Department of Hematology, Kumamoto University School of Medicine, Kumamoto, Japan
| | - Masakatsu Hishizawa
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hidehiro Itonaga
- Department of Hematology, Sasebo City General Hospital, Sasebo, Japan
| | - Yoshitaka Imaizumi
- Department of Hematology, Atomic Bomb Disease and Hibakusya Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Wataru Munakata
- Department of Hematology, National Cancer Center Hospital, Tokyo, Japan
| | | | | | - Ken Sasai
- KAN Research Institute, Inc., Kobe, Japan
| | | | - Marina Penova
- Center for Genomic Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takahisa Kawaguchi
- Center for Genomic Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiromi Nakamura
- Division of Cancer Genomics, National Cancer Center Research Institute, Tokyo, Japan
| | - Natsuko Hama
- Division of Cancer Genomics, National Cancer Center Research Institute, Tokyo, Japan
| | - Kotaro Shide
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Yoko Kubuki
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Tomonori Hidaka
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Takuro Kameda
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Tsuyoshi Nakamaki
- Division of Hematology, Department of Medicine, Showa University School of Medicine, Tokyo, Japan
| | - Ken Ishiyama
- Department of Hematology and Oncology, Kanazawa University Hospital, Kanazawa, Japan
| | - Shuichi Miyawaki
- Division of Hematology, Department of Internal Medicine, Tokyo Metropolitan Ohtsuka Hospital, Tokyo, Japan
| | - Sung-Soo Yoon
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Kensei Tobinai
- Department of Hematology, National Cancer Center Hospital, Tokyo, Japan
| | - Yasushi Miyazaki
- Department of Hematology, Atomic Bomb Disease and Hibakusya Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Akifumi Takaori-Kondo
- Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Fumihiko Matsuda
- Center for Genomic Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kengo Takeuchi
- Pathology Project for Molecular Targets, Cancer Institute, Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Osamu Nureki
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Aburatani
- Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
| | - Toshiki Watanabe
- Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan
| | - Tatsuhiro Shibata
- Division of Cancer Genomics, National Cancer Center Research Institute, Tokyo, Japan.,Laboratory of Molecular Medicine, Human Genome Center, The institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Masao Matsuoka
- Laboratory of Virus Control, Institute for Virus Research, Kyoto University, Kyoto, Japan
| | - Satoru Miyano
- Laboratory of DNA Information Analysis, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kazuya Shimoda
- Department of Gastroenterology and Hematology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Seishi Ogawa
- Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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19
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Öberg H, Gladh J, Marks K, Ogasawara H, Nilsson A, Pettersson LGM, Öström H. Indication of non-thermal contribution to visible femtosecond laser-induced CO oxidation on Ru(0001). J Chem Phys 2015; 143:074701. [PMID: 26298142 DOI: 10.1063/1.4928646] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We studied CO oxidation on Ru(0001) induced by 400 nm and 800 nm femtosecond laser pulses where we find a branching ratio between CO oxidation and desorption of 1:9 and 1:31, respectively, showing higher selectivity towards CO oxidation for the shorter wavelength excitation. Activation energies computed with density functional theory show discrepancies with values extracted from the experiments, indicating both a mixture between different adsorbed phases and importance of non-adiabatic effects on the effective barrier for oxidation. We simulated the reactions using kinetic modeling based on the two-temperature model of laser-induced energy transfer in the substrate combined with a friction model for the coupling to adsorbate vibrations. This model gives an overall good agreement with experiment except for the substantial difference in yield ratio between CO oxidation and desorption at 400 nm and 800 nm. However, including also the initial, non-thermal effect of electrons transiently excited into antibonding states of the O-Ru bond yielded good agreement with all experimental results.
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Affiliation(s)
- H Öberg
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - J Gladh
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - K Marks
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - H Ogasawara
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A Nilsson
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - L G M Pettersson
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - H Öström
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
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20
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Abstract
Using x-ray photoelectron spectroscopy we observe the breaking of the strong interatomic bond in molecular CO at low temperature on a stepped Cu surface. Since the electronic structure of Cu does not allow for the splitting of CO at such low temperatures it suggests that there may be a less obvious pathway for the process. Through x-ray photoelectron spectroscopy we can clearly identify products associated with the dissociation of CO and the subsequent formation of stable graphitic carbon on the surface. However, the dissociation of CO can be inhibited when the stepped Cu surface is kept clean from surface carbon. These observations imply that the reaction is driven by the presence of small amounts of weakly bound carbon at the surface. Density-functional theory calculations confirm that carbon atoms on a stepped Cu surface indeed are the preferred adsorption sites for CO, which increases the stabilization of CO on the surface and weakens the C-O bond. This results in the breaking of the C-O bond at the step edge via the Boudouard reaction (2CO(ads)→C(ads)+CO(2)) with a barrier of 0.71 eV.
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Affiliation(s)
- M L Ng
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - F Abild-Pedersen
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S Kaya
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - F Mbuga
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H Ogasawara
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Nilsson
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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21
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Xin H, LaRue J, Öberg H, Beye M, Dell'Angela M, Turner JJ, Gladh J, Ng ML, Sellberg JA, Kaya S, Mercurio G, Hieke F, Nordlund D, Schlotter WF, Dakovski GL, Minitti MP, Föhlisch A, Wolf M, Wurth W, Ogasawara H, Nørskov JK, Öström H, Pettersson LGM, Nilsson A, Abild-Pedersen F. Strong Influence of Coadsorbate Interaction on CO Desorption Dynamics on Ru(0001) Probed by Ultrafast X-Ray Spectroscopy and Ab Initio Simulations. Phys Rev Lett 2015; 114:156101. [PMID: 25933322 DOI: 10.1103/physrevlett.114.156101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Indexed: 06/04/2023]
Abstract
We show that coadsorbed oxygen atoms have a dramatic influence on the CO desorption dynamics from Ru(0001). In contrast to the precursor-mediated desorption mechanism on Ru(0001), the presence of surface oxygen modifies the electronic structure of Ru atoms such that CO desorption occurs predominantly via the direct pathway. This phenomenon is directly observed in an ultrafast pump-probe experiment using a soft x-ray free-electron laser to monitor the dynamic evolution of the valence electronic structure of the surface species. This is supported with the potential of mean force along the CO desorption path obtained from density-functional theory calculations. Charge density distribution and frozen-orbital analysis suggest that the oxygen-induced reduction of the Pauli repulsion, and consequent increase of the dative interaction between the CO 5σ and the charged Ru atom, is the electronic origin of the distinct desorption dynamics. Ab initio molecular dynamics simulations of CO desorption from Ru(0001) and oxygen-coadsorbed Ru(0001) provide further insights into the surface bond-breaking process.
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Affiliation(s)
- H Xin
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 95305, USA
| | - J LaRue
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - H Öberg
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - M Beye
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
| | - M Dell'Angela
- University of Hamburg and Center for Free Electron Laser Science, Luruper Chausse 149, D-22761 Hamburg, Germany
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Gladh
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - M L Ng
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J A Sellberg
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - S Kaya
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - G Mercurio
- University of Hamburg and Center for Free Electron Laser Science, Luruper Chausse 149, D-22761 Hamburg, Germany
| | - F Hieke
- University of Hamburg and Center for Free Electron Laser Science, Luruper Chausse 149, D-22761 Hamburg, Germany
| | - D Nordlund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M P Minitti
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A Föhlisch
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
- Fakultät für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
| | - M Wolf
- Fritz-Haber Institute of the Max-Planck-Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - W Wurth
- University of Hamburg and Center for Free Electron Laser Science, Luruper Chausse 149, D-22761 Hamburg, Germany
- DESY Photon Science, Notkestrasse 85, 22607 Hamburg, Germany
| | - H Ogasawara
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J K Nørskov
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 95305, USA
| | - H Öström
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - L G M Pettersson
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
| | - A Nilsson
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Department of Physics, AlbaNova University Center, Stockholm University, SE-10691 Stockholm, Sweden
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - F Abild-Pedersen
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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22
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Dell'Angela M, Anniyev T, Beye M, Coffee R, Föhlisch A, Gladh J, Kaya S, Katayama T, Krupin O, Nilsson A, Nordlund D, Schlotter WF, Sellberg JA, Sorgenfrei F, Turner JJ, Öström H, Ogasawara H, Wolf M, Wurth W. Vacuum space charge effects in sub-picosecond soft X-ray photoemission on a molecular adsorbate layer. Struct Dyn 2015; 2:025101. [PMID: 26798795 PMCID: PMC4711610 DOI: 10.1063/1.4914892] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 03/03/2015] [Indexed: 06/05/2023]
Abstract
Vacuum space charge induced kinetic energy shifts of O 1s and Ru 3d core levels in femtosecond soft X-ray photoemission spectra (PES) have been studied at a free electron laser (FEL) for an oxygen layer on Ru(0001). We fully reproduced the measurements by simulating the in-vacuum expansion of the photoelectrons and demonstrate the space charge contribution of the high-order harmonics in the FEL beam. Employing the same analysis for 400 nm pump-X-ray probe PES, we can disentangle the delay dependent Ru 3d energy shifts into effects induced by space charge and by lattice heating from the femtosecond pump pulse.
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Affiliation(s)
| | - T Anniyev
- SUNCAT Center for Interface Science and Catalysis , SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - R Coffee
- LCLS, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - J Gladh
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | - S Kaya
- SUNCAT Center for Interface Science and Catalysis , SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - T Katayama
- SUNCAT Center for Interface Science and Catalysis , SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | | | - D Nordlund
- SSRL, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - F Sorgenfrei
- Physics Department and Center for Free-Electron Laser Science, Universität Hamburg , 22607 Hamburg, Germany
| | - J J Turner
- Linac Coherent Light Source, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - H Öström
- Department of Physics, AlbaNova University Center, Stockholm University , SE-10691 Stockholm, Sweden
| | | | - M Wolf
- Fritz-Haber Institute , Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany
| | - W Wurth
- Physics Department and Center for Free-Electron Laser Science, Universität Hamburg , 22607 Hamburg, Germany
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23
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Öström H, Öberg H, Xin H, LaRue J, Beye M, Dell’Angela M, Gladh J, Ng ML, Sellberg JA, Kaya S, Mercurio G, Nordlund D, Hantschmann M, Hieke F, Kühn D, Schlotter WF, Dakovski GL, Turner JJ, Minitti MP, Mitra A, Moeller SP, Föhlisch A, Wolf M, Wurth W, Persson M, Nørskov JK, Abild-Pedersen F, Ogasawara H, Pettersson LGM, Nilsson A. Probing the transition state region in catalytic CO oxidation on Ru. Science 2015; 347:978-82. [DOI: 10.1126/science.1261747] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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24
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Tokano Y, Ogasawara H, Ando S, Fujii T, Kaneko H, Tamura N, Yano T, Hirokawa K, Fukazawa T, Murashima A, Kobayashi S, Sekigawa I, Takasaki Y, Iida N, Hashimoto H. Cyclosporin A therapy for interstitial pneumonitis associated with rheumatic disease. Mod Rheumatol 2014; 12:305-10. [DOI: 10.3109/s101650200054] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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25
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Schiros T, Andersson KJ, MacNaughton J, Gladh J, Matsuda A, Öström H, Takahashi O, Pettersson LGM, Nilsson A, Ogasawara H. Unique water-water coordination tailored by a metal surface. J Chem Phys 2013; 138:234708. [DOI: 10.1063/1.4809680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Beye M, Anniyev T, Coffee R, Dell'Angela M, Föhlisch A, Gladh J, Katayama T, Kaya S, Krupin O, Møgelhøj A, Nilsson A, Nordlund D, Nørskov JK, Öberg H, Ogasawara H, Pettersson LGM, Schlotter WF, Sellberg JA, Sorgenfrei F, Turner JJ, Wolf M, Wurth W, Oström H. Selective ultrafast probing of transient hot chemisorbed and precursor states of CO on Ru(0001). Phys Rev Lett 2013; 110:186101. [PMID: 23683223 DOI: 10.1103/physrevlett.110.186101] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/03/2013] [Indexed: 05/19/2023]
Abstract
We have studied the femtosecond dynamics following optical laser excitation of CO adsorbed on a Ru surface by monitoring changes in the occupied and unoccupied electronic structure using ultrafast soft x-ray absorption and emission. We recently reported [M. Dell'Angela et al. Science 339, 1302 (2013)] a phonon-mediated transition into a weakly adsorbed precursor state occurring on a time scale of >2 ps prior to desorption. Here we focus on processes within the first picosecond after laser excitation and show that the metal-adsorbate coordination is initially increased due to hot-electron-driven vibrational excitations. This process is faster than, but occurs in parallel with, the transition into the precursor state. With resonant x-ray emission spectroscopy, we probe each of these states selectively and determine the respective transient populations depending on optical laser fluence. Ab initio molecular dynamics simulations of CO adsorbed on Ru(0001) were performed at 1500 and 3000 K providing insight into the desorption process.
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Affiliation(s)
- M Beye
- SIMES, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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Kitagawa Y, Kikuchi S, Arita Y, Nishimura M, Mizuno K, Ogasawara H, Kawano T, Ochiai T, Otsuji E, Imai T. Inhibition of CCL20 increases mortality in models of mouse sepsis with intestinal apoptosis. Surgery 2013; 154:78-88. [PMID: 23601903 DOI: 10.1016/j.surg.2013.02.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Accepted: 02/07/2013] [Indexed: 10/27/2022]
Abstract
BACKGROUND CC chemokine ligand 20 (CCL20) and CC chemokine receptor 6 are believed to stimulate the recruitment of neutrophils and activation of macrophages against bacterial pathogens through the activation of T helper cells. We analyzed the role of CCL20 in the acute phase of sepsis. METHODS The effect of a neutralizing, anti-mouse CCL20 monoclonal antibody (mAb) was examined in 2 murine models of sepsis: Cecal ligation and puncture (CLP) and Escherichia coli peritonitis. Immune cell migration, bacterial clearance, and expression of 17 cytokines and 5 chemokines were quantified in E coli-induced peritonitis. Expression of CCL20 in various tissues was determined, and apoptotic cells in jejunum were measured. RESULTS Anti-CCL20 mAb increased mortality in CLP and E coli peritonitis (P = .029 and .024, respectively by Kaplan-Meier method and log-rank test). The 48-hour survival rate in anti-CCL20 mAb- and control immunoglobulin (Ig)G-treated mice was 37% (11/30) vs 62% (18/29) in CLP and 28% (11/40) vs 48% (19/40) in bacterial peritonitis. Neutralization of CCL20 showed no effect on leukocyte infiltration into the peritoneal cavity or bacterial clearance at 24 hours. CCL20 was induced strongly and predominantly in jejunum after bacterial infection, and neutralizing CCL20 increased apoptosis of epithelial cells in jejunum crypt. Inhibition of CCL20 increased serum tumor necrosis factor (TNF)-α (3.3-fold greater than control mice) and decreased serum interleukin (IL)-1α and IL-6. CONCLUSION Neutralization of CCL20 before induction of sepsis increased mortality during sepsis accompanied with increasing epithelial apoptosis in the jejunum and augmenting serum TNF-α.
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Kurosaki E, Ogasawara H. Ipragliflozin and other sodium-glucose cotransporter-2 (SGLT2) inhibitors in the treatment of type 2 diabetes: preclinical and clinical data. Pharmacol Ther 2013; 139:51-9. [PMID: 23563279 DOI: 10.1016/j.pharmthera.2013.04.003] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 03/01/2013] [Indexed: 02/08/2023]
Abstract
Sodium-glucose cotransporter-2 (SGLT2) is expressed in the proximal tubules of the kidneys and plays a key role in renal glucose reabsorption. A novel class of antidiabetic medications, SGLT2-selective inhibitors attempt to improve glycemic control in diabetics by preventing glucose from being reabsorbed through SGLT2 and re-entering circulation. Ipragliflozin is an SGLT2 inhibitor in Phase 3 clinical development for the treatment of type 2 diabetes mellitus (T2DM). In this review, we summarize recent animal and human studies on ipragliflozin and other SGLT2 inhibitors including dapagliflozin, canagliflozin, empagliflozin, tofogliflozin, and luseogliflozin. These agents all show potent and selective SGLT2 inhibition in vitro and reduce blood glucose levels and HbA1c in both diabetic animal models and patients with T2DM. SGLT2 inhibitors offer several advantages over other classes of hypoglycemic agents. Due to their insulin-independent mode of action, SGLT2 inhibitors provide steady glucose control without major risk for hypoglycemia and may also reverse β-cell dysfunction and insulin resistance. Other favorable effects of SGLT2 inhibitors include a reduction in both body weight and blood pressure. SGLT2 inhibitors are safe and well tolerated and can easily be combined with other classes of antidiabetic medications to achieve tighter glycemic control. The long-term safety and efficacy of these agents are under evaluation.
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Dell'Angela M, Anniyev T, Beye M, Coffee R, Fohlisch A, Gladh J, Katayama T, Kaya S, Krupin O, LaRue J, Mogelhoj A, Nordlund D, Norskov JK, Oberg H, Ogasawara H, Ostrom H, Pettersson LGM, Schlotter WF, Sellberg JA, Sorgenfrei F, Turner JJ, Wolf M, Wurth W, Nilsson A. Real-Time Observation of Surface Bond Breaking with an X-ray Laser. Science 2013; 339:1302-5. [DOI: 10.1126/science.1231711] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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30
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Gladh J, Öberg H, Li J, Ljungberg MP, Matsuda A, Ogasawara H, Nilsson A, Pettersson LGM, Öström H. X-ray emission spectroscopy and density functional study of CO/Fe(100). J Chem Phys 2012; 136:034702. [DOI: 10.1063/1.3675834] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Miller DJ, Öberg H, Kaya S, Sanchez Casalongue H, Friebel D, Anniyev T, Ogasawara H, Bluhm H, Pettersson LGM, Nilsson A. Oxidation of Pt(111) under near-ambient conditions. Phys Rev Lett 2011; 107:195502. [PMID: 22181624 DOI: 10.1103/physrevlett.107.195502] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Indexed: 05/31/2023]
Abstract
The oxidation of Pt(111) at near-ambient O2 pressures has been followed in situ using x-ray photoelectron spectroscopy (XPS) and ex situ using x-ray absorption spectroscopy (XAS). Polarization-dependent XAS signatures at the O K edge reveal significant temperature- and pressure-dependent changes of the Pt-O interaction. Oxide growth commences via a PtO-like surface oxide that coexists with chemisorbed oxygen, while an ultrathin α-PtO2 trilayer is identified as the precursor to bulk oxidation. These results have important implications for understanding the chemical state of Pt in catalysis.
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Affiliation(s)
- D J Miller
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA
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Ogasawara H, Kawato M. The protein kinase Mζ network as a bistable switch to store neuronal memory. BMC Syst Biol 2010; 4:181. [PMID: 21194445 PMCID: PMC3022653 DOI: 10.1186/1752-0509-4-181] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2010] [Accepted: 12/31/2010] [Indexed: 11/10/2022]
Abstract
Background Protein kinase Mζ (PKMζ), the brain-specific, atypical protein kinase C isoform, plays a key role in long-term maintenance of memory. This molecule is essential for long-term potentiation of the neuron and various modalities of learning such as spatial memory and fear conditioning. It is unknown, however, how PKMζ stores information for long periods of time despite molecular turnover. Results We hypothesized that PKMζ forms a bistable switch because it appears to constitute a positive feedback loop (PKMζ induces its local synthesis) part of which is ultrasensitive (PKMζ stimulates its synthesis through dual pathways). To examine this hypothesis, we modeled the biochemical network of PKMζ with realistic kinetic parameters. Bifurcation analyses of the model showed that the system maintains either the up state or the down state according to previous inputs. Furthermore, the model was able to reproduce a variety of previous experimental results regarding synaptic plasticity and learning, which suggested that it captures the essential mechanism for neuronal memory. We proposed in vitro and in vivo experiments that would critically examine the validity of the model and illuminate the pivotal role of PKMζ in synaptic plasticity and learning. Conclusions This study revealed bistability of the PKMζ network and supported its pivotal role in long-term storage of memory.
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Affiliation(s)
- Hideaki Ogasawara
- National Institute of Information and Communications Technology, 2-2-2, Hikaridai, Seika, Kyoto 619-0288, Japan.
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33
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Miller DJ, Öberg H, Näslund LÅ, Anniyev T, Ogasawara H, Pettersson LGM, Nilsson A. Low O2 dissociation barrier on Pt(111) due to adsorbate–adsorbate interactions. J Chem Phys 2010; 133:224701. [DOI: 10.1063/1.3512618] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Schiros T, Takahashi O, Andersson KJ, Öström H, Pettersson LGM, Nilsson A, Ogasawara H. The role of substrate electrons in the wetting of a metal surface. J Chem Phys 2010; 132:094701. [DOI: 10.1063/1.3292681] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Ogasawara H, Kageyama M, Yamaji K, Takasaki Y. The possibility that autoimmune disease can be induced by a molecular mimicry mechanism between autoantigen and human endogenous retrovirus. Lupus 2009; 19:111-3. [PMID: 19884218 DOI: 10.1177/0961203309106767] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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36
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Abstract
A persistent decrease in synaptic efficacy, called long-term depression (LTD), of the parallel fiber-Purkinje cell synapse is thought to underlie some forms of learning and memory in the cerebellum. Simulation studies predicted that mitogen-activated protein kinase and protein kinase C would mutually activate each other and make a bistable positive feedback loop, thereby providing a molecular basis for LTD. This claim stimulated experimenters to successfully demonstrate the feedback loop and its pivotal role in cerebellar LTD.
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Affiliation(s)
- Hideaki Ogasawara
- National Institute of Information and Communications Technology, Seika, Kyoto, Japan.
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37
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Tatarkhanov M, Fomin E, Salmeron M, Andersson K, Ogasawara H, Pettersson LGM, Nilsson A, Cerdá JI. The structure of mixed H2O-OH monolayer films on Ru(0001). J Chem Phys 2009; 129:154109. [PMID: 19045178 DOI: 10.1063/1.2988903] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Scanning tunneling microscopy (STM) and x-ray absorption spectroscopy (XAS) have been used to study the structures produced by water on Ru(0001) at temperatures above 140 K. It was found that while undissociated water layers are metastable below 140 K, heating above this temperature produces drastic transformations, whereby a fraction of the water molecules partially dissociate and form mixed H(2)O-OH structures. X-ray photoelectron spectroscopy and XAS revealed the presence of hydroxyl groups with their O-H bond essentially parallel to the surface. STM images show that the mixed H(2)O-OH structures consist of long narrow stripes aligned with the three crystallographic directions perpendicular to the close-packed atomic rows of the Ru(0001) substrate. The internal structure of the stripes is a honeycomb network of H-bonded water and hydroxyl species. We found that the metastable low temperature molecular phase can also be converted to a mixed H(2)O-OH phase through excitation by the tunneling electrons when their energy is 0.5 eV or higher above the Fermi level. Structural models based on the STM images were used for density functional theory optimizations of the stripe geometry. The optimized geometry was then utilized to calculate STM images for comparison with the experiment.
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Affiliation(s)
- M Tatarkhanov
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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38
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Ogasawara H, Kawato M. A dynamical system analysis of a putative long-term memory trace, protein kinase Mζ. Neurosci Res 2009. [DOI: 10.1016/j.neures.2009.09.724] [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: 11/24/2022]
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39
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Nagai Y, Ogasawara H, Taketa Y, Aso H, Tanaka S, Kanaya T, Watanabe K, Ohwada S, Muneta Y, Yamaguchi T. Bovine anterior pituitary progenitor cell line expresses interleukin (IL)-18 and IL-18 receptor. J Neuroendocrinol 2008; 20:1233-41. [PMID: 18761716 DOI: 10.1111/j.1365-2826.2008.01779.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the anterior pituitary gland, inflammatory mediators regulate cell function through an immuno-endocrine pathway. Recent studies have shown that undifferentiated stem cells act as immunomodulators. These studies prompted us to establish a progenitor cell line from the bovine anterior pituitary gland and to detail its function. First, we localised interleukin (IL)-18 by immunohistochemistry to the marginal cell layer of Rathke's pouch that is assumed to embody a stem/progenitor cell compartment of the postnatal pituitary gland. A cloned anterior pituitary-derived cell line from the bovine anterior pituitary gland was established from single cell clone by the limiting dilution method and was designated as bovine anterior pituitary-derived cell line (BAPC)-1. BAPC-1 cells constantly expressed mRNAs for IL-18 and IL-18 receptor, and grew steadily and rapidly in the medium containing epidermal growth factor and basic fibroblast growth factor. The cell line also expressed the mRNAs for the stem/progenitor cell- related factors such as Nanog, Oct-4, Ptch1, Nestin, Notch1, Hes1, Lrp and Fzd4, and the mRNAs for embryonic pituitary-related factors, such as Lhx3, PitX1 and Pit-1. The nuclei of BAPC-1 were immunostained positively for Pit-1, Hes1 and beta-catenin antibodies. Furthermore, BAPC-1 cells expressed mRNAs for cytokine such as IL-1alpha, IL-6, IL-7, IL-12 and IL-15. Stimulation of BAPC-1 cells with IL-18 increased expression of mRNAs for IL-1alpha, IL-6, IL-1beta and IL-8. At day 6 in culture, BAPC-1 cells also express growth hormone mRNA. These results strongly suggest that BAPC-1 is a stem/progenitor cell line and modulates the immuno-endocrine function of the anterior pituitary cells through its cytokine production.
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Affiliation(s)
- Y Nagai
- Laboratory of Functional Morphology, Graduate School of Agricultural Science, Tohoku University, Aoba-ku, Sendai, Japan
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40
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Abstract
Long-term depression (LTD) at parallel fiber-Purkinje cell (PF-PC) synapses is thought to be the cellular correlate of cerebellar associative learning. The molecular processes are, in brief, phosphorylation of AMPA-type glutamate receptors (AMPARs) and their subsequent removal from the surface of the PF-PC synapse. In order to elucidate the fundamental mechanisms for cerebellar LTD and further the understanding of its computational role, we have investigated its systems biology and proposed the following hypotheses, some of which have already been experimentally verified: (1) due to the mitogen-activated protein kinase (MAPK)-protein kinase C (PKC) positive feedback loop, phosphorylation of AMPARs is an all-or-none event; (2) the inositol 1,4,5-triphosphate receptor detects concurrent PF and climbing fiber inputs, forming the cellular basis for associative learning, and (3) the local concentration of nitric oxide in the PC dendrite reflects the relevance of a given context, enabling context-dependent selection of learning modules within the cerebellum. In this review, we first introduce theoretical studies on cerebellar LTD, mainly focusing on our own published work, followed by a discussion of the effects of stochasticity, localization, diffusion, and scaffolding. Neurons embody two features that are apparently contradictory, yet necessary for synaptic memory: stability and plasticity. We will also present models for explaining how neurons solve this dilemma. In the final section, we propose a conceptual model in which a cascade of excitable dynamics with different time scales, i.e., Ca(2+)-induced Ca(2+) release, the MAPK-PKC positive feedback loop, and protein kinase Mzeta (PKMzeta)-induced PKMzeta synthesis, provides a mechanism for stable memory that is still amenable to modifications.
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Affiliation(s)
- Hideaki Ogasawara
- National Institute of Information and Communications Technology, Kyoto, Japan.
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41
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Nordlund D, Odelius M, Bluhm H, Ogasawara H, Pettersson L, Nilsson A. Electronic structure effects in liquid water studied by photoelectron spectroscopy and density functional theory. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.096] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Nordlund D, Ogasawara H, Bluhm H, Takahashi O, Odelius M, Nagasono M, Pettersson LGM, Nilsson A. Probing the electron delocalization in liquid water and ice at attosecond time scales. Phys Rev Lett 2007; 99:217406. [PMID: 18233257 DOI: 10.1103/physrevlett.99.217406] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2007] [Indexed: 05/23/2023]
Abstract
We determine electron delocalization rates in liquid water and ice using core-hole decay spectroscopy. The hydrogen-bonded network delocalizes the electrons in less than 500 as. Broken or weak hydrogen bonds--in the liquid or at the surface of ice--provide states where the electron remains localized longer than 20 fs. These asymmetrically bonded water species provide electron traps, acting as a strong precursor channel to the hydrated electron.
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Affiliation(s)
- D Nordlund
- Stanford Synchrotron Radiation Laboratory, P.O. Box 20450 Stanford, California 94309, USA
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Öström H, Ogasawara H, Näslund LÅ, Andersson K, Pettersson LGM, Nilsson A. Geometric and electronic structure of methane adsorbed on a Pt surface. J Chem Phys 2007; 127:144702. [DOI: 10.1063/1.2781470] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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44
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Ogasawara H. Asymptotic expansion and asymptotic robustness of the normal-theory estimators in the random regression model. J STAT COMPUT SIM 2007. [DOI: 10.1080/10629360600679383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Tanaka K, Khiroug L, Santamaria F, Doi T, Ogasawara H, Ellis-Davies GCR, Kawato M, Augustine GJ. Ca2+ requirements for cerebellar long-term synaptic depression: role for a postsynaptic leaky integrator. Neuron 2007; 54:787-800. [PMID: 17553426 DOI: 10.1016/j.neuron.2007.05.014] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2006] [Revised: 03/30/2007] [Accepted: 05/16/2007] [Indexed: 11/23/2022]
Abstract
Photolysis of a caged Ca(2+) compound was used to characterize the dependence of cerebellar long-term synaptic depression (LTD) on postsynaptic Ca(2+) concentration ([Ca(2+)](i)). Elevating [Ca(2+)](i) was sufficient to induce LTD without requiring any of the other signals produced by synaptic activity. A sigmoidal relationship between [Ca(2+)](i) and LTD indicated a highly cooperative triggering of LTD by Ca(2+). The duration of the rise in [Ca(2+)](i) influenced the apparent Ca(2+) affinity of LTD, and this time-dependent behavior could be described by a leaky integrator process with a time constant of 0.6 s. A computational model, based on a positive-feedback cycle that includes protein kinase C and MAP kinase, was capable of simulating these properties of Ca(2+)-triggered LTD. Disrupting this cycle experimentally also produced the predicted changes in the Ca(2+) dependence of LTD. We conclude that LTD arises from a mechanism that integrates postsynaptic Ca(2+) signals and that this integration may be produced by the positive-feedback cycle.
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Affiliation(s)
- Keiko Tanaka
- Department of Neurobiology, Duke University Medical Center, Box 3209, Durham, NC 27710, USA
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46
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Sekigawa I, Kawasaki M, Ogasawara H, Kaneda K, Kaneko H, Takasaki Y, Ogawa H. DNA methylation: its contribution to systemic lupus erythematosus. Clin Exp Med 2007; 6:99-106. [PMID: 17061057 DOI: 10.1007/s10238-006-0103-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2006] [Accepted: 08/22/2006] [Indexed: 10/24/2022]
Abstract
Recent studies on epigenetics, including the methylation of DNA and the enzymes regulating methylation, seem likely to contribute to understanding the pathogenesis of autoimmune diseases such as systemic lupus erythematosus (SLE). In fact, the relationship between DNA methylation and SLE has long been the subject of investigation. To obtain a deeper understanding of the role of DNA methylation in the onset of SLE, we reviewed the findings reported in the literature and our own data about DNA methylation and SLE. Various studies have indicated the possible importance of DNA methylation, especially hypomethylation, in the aetiology of SLE. Epigenetic studies may provide clues for elucidating the pathogenesis of SLE and for developing new strategies to treat this disease.
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Affiliation(s)
- I Sekigawa
- Department of Internal Medicine, Juntendo University Urayasu Hospital, 2-1-1 Tomioka, Urayasu-shi, Chiba, 279-0021, Japan.
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Ogasawara H, Doi T, Doya K, Kawato M. Nitric oxide regulates input specificity of long-term depression and context dependence of cerebellar learning. PLoS Comput Biol 2006; 3:e179. [PMID: 17222054 PMCID: PMC1769409 DOI: 10.1371/journal.pcbi.0020179] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Accepted: 11/07/2006] [Indexed: 11/18/2022] Open
Abstract
Recent studies have shown that multiple internal models are acquired in the cerebellum and that these can be switched under a given context of behavior. It has been proposed that long-term depression (LTD) of parallel fiber (PF)–Purkinje cell (PC) synapses forms the cellular basis of cerebellar learning, and that the presynaptically synthesized messenger nitric oxide (NO) is a crucial “gatekeeper” for LTD. Because NO diffuses freely to neighboring synapses, this volume learning is not input-specific and brings into question the biological significance of LTD as the basic mechanism for efficient supervised learning. To better characterize the role of NO in cerebellar learning, we simulated the sequence of electrophysiological and biochemical events in PF–PC LTD by combining established simulation models of the electrophysiology, calcium dynamics, and signaling pathways of the PC. The results demonstrate that the local NO concentration is critical for induction of LTD and for its input specificity. Pre- and postsynaptic coincident firing is not sufficient for a PF–PC synapse to undergo LTD, and LTD is induced only when a sufficient amount of NO is provided by activation of the surrounding PFs. On the other hand, above-adequate levels of activity in nearby PFs cause accumulation of NO, which also allows LTD in neighboring synapses that were not directly stimulated, ruining input specificity. These findings lead us to propose the hypothesis that NO represents the relevance of a given context and enables context-dependent selection of internal models to be updated. We also predict sparse PF activity in vivo because, otherwise, input specificity would be lost. The cerebellum is essential for coordinated movements. The skills for executing such movements are acquired in modules of the cerebellum, and the appropriate modules in which to store the skill for a certain movement are selected according to the environment, or the context, where the movement is made. We are interested in the molecular mechanisms that enable context-dependent cerebellar learning. In search of the key molecules, we combined established simulation models of Purkinje cells, the only output neurons in the cerebellar cortex, and constructed a new model. Using computer simulation, we found that nitric oxide is likely to have a pivotal role in context-dependent learning. Our simulation also provides insights into how sparse sensory information is coded in the cerebellar cortex. These findings have led us to propose the experimentally testable hypothesis that the relevance of a given context to learning modules is represented by the concentration of nitric oxide.
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Schiros T, Haq S, Ogasawara H, Takahashi O, Öström H, Andersson K, Pettersson L, Hodgson A, Nilsson A. Structure of water adsorbed on the open Cu(110) surface: H-up, H-down, or both? Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.08.048] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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49
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Koshitani T, Uehara Y, Yasu T, Yamashita Y, Kirishima T, Yoshinami N, Takaaki J, Shintani H, Kashima K, Ogasawara H, Katsuma Y, Okanoue T. Endoscopic management of pancreaticopleural fistulas: a report of three patients. Endoscopy 2006; 38:749-51. [PMID: 16586252 DOI: 10.1055/s-2006-925062] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 12/13/2022]
Abstract
Pancreaticopleural fistulas are a rare complication of acute or chronic pancreatitis, and are usually treated by surgery. We report three patients whose pancreaticopleural fistulas were successfully treated by endoscopic retrograde cholangiopancreatography and drainage (stenting, nasopancreatic drainage). In one patient a pancreatic pseudocyst persisted despite successful initial closure of the leak using this method and, as it was also suspected to be infected, additional drainage of the pseudocyst was required. Endotherapy of pancreaticopleural fistulas could obviate the need for surgery when conventional medical treatment has failed in this condition.
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Affiliation(s)
- T Koshitani
- Department of Gastroenterology, Kyoto City Hospital, Kyoto, Japan.
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50
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Oström H, Ogasawara H, Näslund LA, Pettersson LGM, Nilsson A. Physisorption-induced C-H bond elongation in methane. Phys Rev Lett 2006; 96:146104. [PMID: 16712100 DOI: 10.1103/physrevlett.96.146104] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Indexed: 05/09/2023]
Abstract
Physisorption of methane to a Pt surface was studied by x-ray absorption spectroscopy in combination with density functional theory spectrum calculations. The experiment shows new electronic states appearing upon physisorption. We find that these states are due to orbital mixing causing charge polarization as a means to minimize Pauli repulsion. The results can be explained by elongation of 1 C-H bond by 0.09 A in the physisorbed state even though no covalent chemical bond is formed.
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Affiliation(s)
- H Oström
- Stockholm University, AlbaNova University Center, Fysikum, SE-106 91 Stockholm, Sweden
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