1
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Abe Y, Murase T, Mitsuma M, Shinba Y, Yamashita H, Ikematsu K. Dynamics of somatostatin 4 receptor expression during chronic-stress loading and its potential as a chronic-stress marker. Sci Rep 2024; 14:10045. [PMID: 38698013 PMCID: PMC11066077 DOI: 10.1038/s41598-024-58621-7] [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: 10/24/2023] [Accepted: 04/01/2024] [Indexed: 05/05/2024] Open
Abstract
Chronic stress has been implicated in mental illnesses and depressive behaviors. Somatostatin 4 receptor (SSTR4) has been shown to mediate anxiolytic and depression-like effects. Here, we aimed to explore the potential of SSTR4 as a diagnostic marker for chronic stress in mice. The mice were divided into single stress, chronic restraint stress, and control groups, and Sstr4 mRNA expression in the pituitary, lungs, and thymus, its protein expression in the thymus, were analyzed. Compared to controls, Sstr4 mRNA expression decreased significantly in the pituitary gland of the chronic and single-stress groups (P = 0.0181 and 0.0022, respectively) and lungs of the single-stress group (P = 0.0124), whereas it significantly increased in the thymus of the chronic-stress group (P = 0.0313). Thymic SSTR4 expression did not decrease significantly in stress groups compared to that in the control group (P = 0.0963). These results suggest that SSTR4 expression fluctuates in response to stress. Furthermore, Sstr4 mRNA expression dynamics in each organ differed based on single or chronic restraint stress-loading periods. In conclusion, this study suggests that investigating SSTR4 expression in each organ could allow for its use as a stress marker to estimate the stress-loading period and aid in diagnosing chronic stress.
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Affiliation(s)
- Yuki Abe
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan
| | - Takehiko Murase
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan.
- Department of Forensic Medicine, Faculty of Medicine, Kagawa University, 1750-1, Miki, Kita, Kagawa, 761-0793, Japan.
| | - Masahide Mitsuma
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan
| | - Yoriko Shinba
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan
| | - Hiromi Yamashita
- Division of Forensic Dental Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523, Japan
| | - Kazuya Ikematsu
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, 1-12-4, Sakamoto, Nagasaki, 852-8523, Japan
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2
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Shun K, Matsukawa S, Mori K, Yamashita H. Specific Hydrogen Spillover Pathways Generated on Graphene Oxide Enabling the Formation of Non-Equilibrium Alloy Nanoparticles. Small 2024; 20:e2306765. [PMID: 38072797 DOI: 10.1002/smll.202306765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 10/14/2023] [Indexed: 05/12/2024]
Abstract
The phenomenon of hydrogen spillover is investigated as a means of realizing a hydrogen-based society for over half a century. Herein, a graphene oxide having a precisely tuned architecture via calcination in air to introduce ether groups onto basal planes along with carbon defects is reported. This material provides specific pathways for the spillover of atomic hydrogen and has practical applications with regard to the synthesis of non-equilibrium solid-solution alloy nanoparticles. A combination of experimental work and simulations confirmed that the presence of ether groups associated with carbon defects facilitated hydrogen spillover within the basal planes of this graphene oxide. This enhanced hydrogen spillover ability, in turn, enables the simultaneous reduction of Ru3+ and Ni2+ ions to form RuNi alloy nanoparticles under hydrogen reduction conditions. Energy dispersive X-ray and X-ray absorption near edge structure simulations establish that this strategy forms unique alloy nanoparticles each comprising a Ru core with a RuNi solid-solution shell having a hexagonal close-packed structure. These non-equilibrium RuNi alloy nanoparticles exhibit greater catalytic activity than monometallic Ru nanoparticles during the hydrolysis of ammonia borane.
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Affiliation(s)
- Kazuki Shun
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Satoshi Matsukawa
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka, 565-0871, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka, 565-0871, Japan
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3
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Bando K, Yamashita H, Hattori F. An Automated Culture System for Maintaining and Differentiating Human-Induced Pluripotent Stem Cells. J Vis Exp 2024. [PMID: 38345218 DOI: 10.3791/65672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2024] Open
Abstract
Human induced pluripotent stem cells (hiPSCs) with infinite self-proliferating ability have been expected to have applications in numerous fields, including the elucidation of rare disease pathologies, the development of new medicines, and regenerative medicine aiming to restore damaged organs. Despite this, the social implementation of hiPSCs is still limited. This is partly because of the difficulty of reproducing differentiation in culture, even with advanced knowledge and sophisticated technical skills, due to the high sensitivity of iPSCs to minute environmental changes. The application of an automated culture system can solve this issue. Experiments with high reproducibility independent of a researcher's skill can be expected according to a shared procedure across various institutes. Although several automated culture systems that can maintain iPSC cultures and induce differentiation have been developed previously, these systems are heavy, large, and costly because they make use of humanized, multi-articulated robotic arms. To improve on the above issues, we developed a new system using a simple x-y-z axis slide rail system, allowing it to be more compact, lighter, and cheaper. Furthermore, the user can easily modify parameters in the new system to develop new handling tasks. Once a task is established, all the user needs to do is prepare the iPSC, supply the reagents and consumables needed for the desired task in advance, select the task number, and specify the time. We confirmed that the system could maintain iPSCs in an undifferentiated state through several passages without feeder cells and differentiate into various cell types, including cardiomyocytes, hepatocytes, neural progenitors, and keratinocytes. The system will enable highly reproducible experiments across institutions without the need for skilled researchers and will facilitate the social implementation of hiPSCs in a wider range of research fields by diminishing the obstacles for new entries.
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Affiliation(s)
- Kazunori Bando
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine;
| | - Hiromi Yamashita
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine
| | - Fumiyuki Hattori
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine
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4
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Li K, Kuwahara Y, Yamashita H. Hollow carbon-based materials for electrocatalytic and thermocatalytic CO 2 conversion. Chem Sci 2024; 15:854-878. [PMID: 38239694 PMCID: PMC10793651 DOI: 10.1039/d3sc05026b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 12/05/2023] [Indexed: 01/22/2024] Open
Abstract
Electrocatalytic and thermocatalytic CO2 conversions provide promising routes to realize global carbon neutrality, and the development of corresponding advanced catalysts is important but challenging. Hollow-structured carbon (HSC) materials with striking features, including unique cavity structure, good permeability, large surface area, and readily functionalizable surface, are flexible platforms for designing high-performance catalysts. In this review, the topics range from the accurate design of HSC materials to specific electrocatalytic and thermocatalytic CO2 conversion applications, aiming to address the drawbacks of conventional catalysts, such as sluggish reaction kinetics, inadequate selectivity, and poor stability. Firstly, the synthetic methods of HSC, including the hard template route, soft template approach, and self-template strategy are summarized, with an evaluation of their characteristics and applicability. Subsequently, the functionalization strategies (nonmetal doping, metal single-atom anchoring, and metal nanoparticle modification) for HSC are comprehensively discussed. Lastly, the recent achievements of intriguing HSC-based materials in electrocatalytic and thermocatalytic CO2 conversion applications are presented, with a particular focus on revealing the relationship between catalyst structure and activity. We anticipate that the review can provide some ideas for designing highly active and durable catalytic systems for CO2 valorization and beyond.
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Affiliation(s)
- Kaining Li
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Osaka 565-0871 Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Osaka 565-0871 Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University 2-1 Yamada-oka, Suita Osaka 565-0871 Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Osaka 565-0871 Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University 2-1 Yamada-oka, Suita Osaka 565-0871 Japan
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5
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Yamashita H, Hattori F. Application of Live Mitochondria Staining in Cell-Sorting to Purify Hepatocytes Derived from Human Induced Pluripotent Stem Cells. J Vis Exp 2023. [PMID: 38108371 DOI: 10.3791/65777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023] Open
Abstract
Human embryonic stem (ES) and induced pluripotent stem (iPS) cells have potential applications in cell-based regenerative medicine for treating severely diseased organs due to their unlimited proliferation and pluripotent properties. However, differentiating human ES/iPS cells into 100% pure target cell types is challenging due to their high sensitivity to the environment. Tumorigenesis after transplantation is caused by contaminated, proliferating, and undifferentiated cells, making high-purification technology essential for the safe realization of regenerative medicine. To mitigate the risk of tumorigenesis, a high-purification technology has been developed for human iPS cell-derived hepatocytes. The method employs FACS (fluorescence-activated cell sorting) using a combination of high mitochondrial content and the cell-surface marker ALCAM (activated leukocyte cell adhesion molecule) without genetic modification. 97% ± 0.38% (n = 5) of the purified hepatocytes using this method exhibited albumin protein expression. This article aims to provide detailed procedures for this method, as applied to the most current two-dimensional differentiation method for human iPS cells into hepatocytes.
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Affiliation(s)
- Hiromi Yamashita
- Innovative Regenerative Medicine, Graduate School of Medicine, Kansai Medical University;
| | - Fumiyuki Hattori
- Innovative Regenerative Medicine, Graduate School of Medicine, Kansai Medical University
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6
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Yasuda M, Kato T, Okano M, Yamashita H, Matsuoka Y, Shirouzu Y, Fujioka T, Hattori F, Tsuji S, Kaneko K, Hitomi H. Efficient protocol for the differentiation of kidney podocytes from induced pluripotent stem cells, involving the inhibition of mTOR. Sci Rep 2023; 13:20010. [PMID: 37973990 PMCID: PMC10654390 DOI: 10.1038/s41598-023-47087-8] [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: 03/01/2023] [Accepted: 11/08/2023] [Indexed: 11/19/2023] Open
Abstract
The mechanistic/mammalian target of rapamycin (mTOR) is involved in a wide range of cellular processes. However, the role of mTOR in podocytes remains unclear. In this study, we aimed to clarify the role of mTOR in podocyte differentiation from human induced pluripotent stem cells (hiPSCs) and to establish an efficient differentiation protocol for human podocytes. We generated podocytes from hiPSCs by modifying protocol. The expression of the podocyte-specific slit membrane components nephrin and podocin was measured using PCR, western blotting, flow cytometry, and immunostaining; and the role of mTOR was evaluated using inhibitors of the mTOR pathway. Nephrin and podocin were found to be expressed in cells differentiated from hiPSCs, and their expression was increased by mTOR inhibitor treatment. S6, a downstream component of the mTOR pathway, was also found to be involved in podocyte differentiation. we evaluated its permeability to albumin, urea, and electrolytes. The induced podocytes were permeable to the small molecules, but only poorly permeable to albumin. We have shown that the mTOR pathway is involved in podocyte differentiation. Our monolayer podocyte differential protocol, using an mTOR inhibitor, provides a novel in vitro model for studies of kidney physiology and pathology.
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Affiliation(s)
- Masahiro Yasuda
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
| | - Tadashi Kato
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
- Division of Nephrology, Department of Medicine, Showa University School of Medicine, Tokyo, Japan
| | - Mai Okano
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
| | - Hiromi Yamashita
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Yoshikazu Matsuoka
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Yasumasa Shirouzu
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Tatsuya Fujioka
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Fumiyuki Hattori
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan
| | - Shoji Tsuji
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
| | - Kazunari Kaneko
- Department of Pediatrics, Kansai Medical University, Osaka, Japan
| | - Hirofumi Hitomi
- Department of iPS Stem Cell Regenerative Medicine, Kansai Medical University, 2-5-1 Shin-Machi, Hirakata, Osaka, 573-1010, Japan.
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7
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Mori K, Fujita T, Hata H, Kim HJ, Nakano T, Yamashita H. Surface Chemical Engineering of a Metal 3D-Printed Flow Reactor Using a Metal-Organic Framework for Liquid-Phase Catalytic H 2 Production from Hydrogen Storage Materials. ACS Appl Mater Interfaces 2023; 15:51079-51088. [PMID: 37879041 DOI: 10.1021/acsami.3c10945] [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] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
The accurate positioning of metal-organic frameworks (MOFs) on the surface of other materials has opened up new possibilities for the development of multifunctional devices. We propose here a postfunctionalization approach for three-dimensional (3D)-printed metallic catalytic flow reactors based on MOFs. The Cu-based reactors were immersed into an acid solution containing an organic linker for the synthesis of MOFs, where Cu2+ ions dissolved in situ were assembled to form MOF crystals on the surface of the reactor. The resultant MOF layer served as a promising interface that enabled the deposition of catalytically active metal nanoparticles (NPs). It also acted as an efficient platform to provide carbonous layers via simple pyrolysis under inert gas conditions, which further enabled functionalization with organic modifiers and metal NPs. Cylindrical-shaped catalytic flow reactors with four different cell densities were used to investigate the effect of the structure of the reactors on the catalytic production of H2 from a liquid-phase hydrogen storage material. The activity increased with an increasing internal surface area but decreased in the reactor with the smallest cell size despite its high internal surface area. The results of fluid dynamics studies indicated that the effect of pressure loss becomes more pronounced as the pore size decreases.
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Affiliation(s)
- Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Anisotropic Design & Additive Manufacturing Research Center, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Tatsuya Fujita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiroto Hata
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hyo-Jin Kim
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takayoshi Nakano
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Anisotropic Design & Additive Manufacturing Research Center, Osaka University, 2-1, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
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8
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Nakatsuka R, Kato T, Zhang R, Uemura Y, Sasaki Y, Matsuoka Y, Shirouzu Y, Fujioka T, Yamashita H, Hattori F, Nozaki T, Ogata H, Hitomi H. The Induction of Parathyroid Cell Differentiation from Human Induced Pluripotent Stem Cells Promoted Via TGF-α/EGFR Signaling. Stem Cells Dev 2023; 32:670-680. [PMID: 37639359 DOI: 10.1089/scd.2023.0130] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023] Open
Abstract
The parathyroid gland plays an essential role in mineral and bone metabolism. Cultivation of physiological human parathyroid cells has yet to be established and the method by which parathyroid cells differentiate from pluripotent stem cells remains uncertain. Therefore, it has been hard to clarify the mechanisms underlying the onset of parathyroid disorders, such as hyperparathyroidism. In this study, we developed a new method of parathyroid cell differentiation from human induced pluripotent stem (iPS) cells. Parathyroid cell differentiation occurred in accordance with embryologic development. Differentiated cells, which expressed the parathyroid hormone, adopted unique cell aggregation similar to the parathyroid gland. In addition, these differentiated cells were identified as calcium-sensing receptor (CaSR)/epithelial cell adhesion molecule (EpCAM) double-positive cells. Interestingly, stimulation with transforming growth factor-α (TGF-α), which is considered a causative molecule of parathyroid hyperplasia, increased the CaSR/EpCAM double-positive cells, but this effect was suppressed by erlotinib, which is an epidermal growth factor receptor (EGFR) inhibitor. These results suggest that TGF-α/EGFR signaling promotes parathyroid cell differentiation from iPS cells in a similar manner to parathyroid hyperplasia.
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Affiliation(s)
- Ryusuke Nakatsuka
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
- Department of Pharmacology, Faculty of Dentistry, Osaka Dental University, Osaka, Japan
| | - Tadashi Kato
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
- Division of Nephrology, Department of Medicine, Showa University, Tokyo, Japan
- Department of Internal Medicine, Showa University Northern Yokohama Hospital, Kanagawa, Japan
| | - Rong Zhang
- Division of Cancer Immunotherapy, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Chiba, Japan
| | - Yasushi Uemura
- Division of Cancer Immunotherapy, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Chiba, Japan
| | - Yuka Sasaki
- Department of Pharmacology, Faculty of Dentistry, Osaka Dental University, Osaka, Japan
| | - Yoshikazu Matsuoka
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
| | - Yasumasa Shirouzu
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
| | - Tatsuya Fujioka
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
| | - Hiromi Yamashita
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
| | - Fumiyuki Hattori
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
| | - Tadashige Nozaki
- Department of Pharmacology, Faculty of Dentistry, Osaka Dental University, Osaka, Japan
| | - Hiroaki Ogata
- Department of Internal Medicine, Showa University Northern Yokohama Hospital, Kanagawa, Japan
| | - Hirofumi Hitomi
- Department of iPS Stem Cell Regenerative Medicine, Faculty of Medicine, Kansai Medical University, Osaka, Japan
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9
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Hashimoto N, Mori K, Matsuzaki S, Iwama K, Kitaura R, Kamiuchi N, Yoshida H, Yamashita H. Sub-nanometric High-Entropy Alloy Cluster: Hydrogen Spillover Driven Synthesis on CeO 2 and Structural Reversibility. JACS Au 2023; 3:2131-2143. [PMID: 37654591 PMCID: PMC10466320 DOI: 10.1021/jacsau.3c00210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 07/05/2023] [Accepted: 07/06/2023] [Indexed: 09/02/2023]
Abstract
High-entropy alloy (HEA) nanoparticles (NPs) have attracted significant attention as promising catalysts owing to the various unique synergistic effects originating from the nanometer-scale, near-equimolar mixing of five or more components to produce single-phase solid solutions. However, the study of sub-nanometer HEA clusters having sizes of less than 1 nm remains incomplete despite the possibility of novel functions related to borderline molecular states with discrete quantum energy levels. The present work demonstrates the synthesis of CeO2 nanorods (CeO2-NRs) on which sub-nanometer CoNiCuZnPd HEA clusters were formed with the aid of a pronounced hydrogen spillover effect on readily reducible CeO2 (110) facets. The CoNiCuZnPd HEA sub-nanoclusters exhibited higher activity during the reduction of NO by H2 even at low temperatures compared with the corresponding monometallic catalysts. These clusters also showed a unique structural reversibility in response to repeated exposure to oxidative/reductive conditions, based on the sacrificial oxidation of the non-noble metals. Both experimental and theoretical analyses established that multielement mixing in quantum-sized regions endowed the HEA clusters with entirely novel catalytic properties.
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Affiliation(s)
- Naoki Hashimoto
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kohsuke Mori
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
- Innovative
Catalysis Science Division, Institute for Open and Transdisciplinary
Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Shuichiro Matsuzaki
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Kazuki Iwama
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Ryota Kitaura
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Naoto Kamiuchi
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Hideto Yoshida
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Hiromi Yamashita
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
- Innovative
Catalysis Science Division, Institute for Open and Transdisciplinary
Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
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10
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Mori K, Shimoji Y, Yamashita H. Improved Low-Temperature Hydrogen Production from Aqueous Methanol Based on Synergism between Cationic Pt and Interfacial Basic LaO x. ChemSusChem 2023; 16:e202300283. [PMID: 37183559 DOI: 10.1002/cssc.202300283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/25/2023] [Accepted: 05/15/2023] [Indexed: 05/16/2023]
Abstract
Aqueous phase reforming of methanol (APRM) is simple, inexpensive and provides a high hydrogen gravimetric density of 18.8 wt. %, and so is superior to traditional gas-phase reactions performed at relatively high temperatures. In the present work, the interface between Pt nanoparticles and a TiN support was modified using a highly dispersed amorphous LaOx phase. The resulting Pt/LaOx /TiO(N) exhibited enhanced activity and long-term stability during the APRM reaction under base-free conditions compared with Pt catalysts supported on unmodified TiN or crystalline La2 O3 . The interfacial amorphous LaOx phase promoted the deposition of small Pt nanoparticles having a narrow size distribution, and also generated electron-deficient Pt. An assessment of kinetic isotope data and theoretical investigations demonstrated that the cationic Pt nanoparticles facilitated the cleavage of O-H and C-H bonds in methanol while the amorphous LaOx enhanced the dissociation of water, thus enabling the water-gas shift reaction under mild conditions.
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Affiliation(s)
- Kohsuke Mori
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yuki Shimoji
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Hiromi Yamashita
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
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11
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Matsuda M, Murase T, Komaki M, Shinba Y, Mitsuma M, Abe Y, Yamashita H, Yukawa N, Ikematsu K. Immunohistochemical study of chicken fat clots: Investigation of the formation mechanism. Leg Med (Tokyo) 2023; 61:102208. [PMID: 36738553 DOI: 10.1016/j.legalmed.2023.102208] [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: 12/01/2022] [Revised: 01/09/2023] [Accepted: 01/16/2023] [Indexed: 01/21/2023]
Abstract
In forensic practice, the presence of chicken fat clots (CFCs) in the heart and/or large blood vessels of cadavers has been empirically used to estimate the time from the onset of fatal events to death. However, little scientific evidence of its significance exists, and the mechanism of its formation has not been elucidated. CFCs contain large amounts of leukocytes; thus, we hypothesized that leukocytes might contribute to their formation. Since leukocytes, especially neutrophils, are considered to be involved in blood coagulation through the formation of neutrophil extracellular traps (NETs), we aimed to investigate whether NETs are related to the formation of CFCs through immunohistochemistry. Most cells in the CFCs were myeloperoxidase- and neutrophil elastase-positive, strongly suggesting that they were neutrophils. Since chromatin is released extracellularly during NET formation, immunostaining was performed against some types of histones in CFCs. A certain number of neutrophils in CFCs showed positive extra-nuclear and extracellular signals of histones. In addition, citrullination of histone H3, which is considered important for histone release, was immunohistochemically detected in some neutrophils. These results suggest that neutrophils may affect the formation of CFCs through histone release. Although it was not clear how and when citrullination and extracellular release of histones in CFCs occur in this study, our findings provide insights into the events occurring at the time of death in a human body.
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Affiliation(s)
- Maiko Matsuda
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Takehiko Murase
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan.
| | - Mizuki Komaki
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Yoriko Shinba
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Masahide Mitsuma
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Yuki Abe
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Hiromi Yamashita
- Division of Forensic Dental Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
| | - Nobuhiro Yukawa
- Section of Legal Medicine, Department of Social Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Kazuya Ikematsu
- Division of Forensic Pathology and Science, Department of Medical and Dental Sciences, Graduate School of Biomedical Sciences, School of Medicine, Nagasaki University, Japan
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12
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Zhang T, Pan Z, Wang J, Qian X, Yamashita H, Bian Z, Zhao Y. Homogeneous Carbon Dot-Anchored Fe(III) Catalysts with Self-Regulated Proton Transfer for Recyclable Fenton Chemistry. JACS Au 2023; 3:516-525. [PMID: 36873695 PMCID: PMC9975837 DOI: 10.1021/jacsau.2c00644] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/15/2022] [Accepted: 12/27/2022] [Indexed: 05/19/2023]
Abstract
Fenton chemistry has been widely studied in a broad range from geochemistry, chemical oxidation to tumor chemodynamic therapy. It was well established that Fe3+/H2O2 resulted in a sluggish initial rate or even inactivity. Herein, we report the homogeneous carbon dot-anchored Fe(III) catalysts (CD-COOFeIII) wherein CD-COOFeIII active center activates H2O2 to produce hydroxyl radicals (•OH) reaching 105 times larger than that of the Fe3+/H2O2 system. The key is the •OH flux produced from the O-O bond reductive cleavage boosting by the high electron-transfer rate constants of CD defects and its self-regulated proton-transfer behavior probed by operando ATR-FTIR spectroscopy in D2O and kinetic isotope effects, respectively. Organic molecules interact with CD-COOFeIII via hydrogen bonds, promoting the electron-transfer rate constants during the redox reaction of CD defects. The antibiotics removal efficiency in the CD-COOFeIII/H2O2 system is at least 51 times large than the Fe3+/H2O2 system under equivalent conditions. Our findings provide a new pathway for traditional Fenton chemistry.
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Affiliation(s)
- Ting Zhang
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China
| | - Zhelun Pan
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China
| | - Jianying Wang
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China
| | - Xufang Qian
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China
| | - Hiromi Yamashita
- Division
of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita565-0871, Osaka, Japan
| | - Zhenfeng Bian
- The
Education Ministry Key Lab. of Resource Chemistry, Shanghai Key Laboratory
of Rare Earth Functional Materials, Shanghai
Normal University, 100
Guilin Road, Shanghai200234, China
| | - Yixin Zhao
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China
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13
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Nishimoto R, Kodama C, Yamashita H, Hattori F. Human Induced Pluripotent Stem Cell-Derived Keratinocyte-Like Cells for Research on Protease-Activated Receptor 2 in Nonhistaminergic Cascades of Atopic Dermatitis . J Pharmacol Exp Ther 2023; 384:248-253. [PMID: 36351795 DOI: 10.1124/jpet.122.001412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/13/2022] [Accepted: 10/06/2022] [Indexed: 11/11/2022] Open
Abstract
Keratinocytes are the most abundant cells in the epidermis, and as part of the frontline immunologic defense system, keratinocytes function as a barrier to exogenous attacks. Protease-activated receptor 2 (PAR2) is expressed in human keratinocytes and activated in several inflammatory conditions, such as atopic dermatitis (AD). In this study, we demonstrated the differentiation of human induced pluripotent stem cell into keratinocytes by the improved, robust differentiation procedure and confirmed that human induced pluripotent stem cell-derived keratinocyte-like cells (iKera) express PAR2, which is activated by external addition of the ligand peptide and trypsin. The activation of PAR2 led to the release of calcium from intracellular calcium storage, followed by the release of the proinflammatory cytokine tumor necrosis factor α Moreover, PAR2 antagonist I-191 (CAS No. 1690172-25-8) inhibited calcium release in a dose-dependent manner. This is the first study to demonstrate that iKera expresses a functional PAR2 protein. Furthermore, our results indicate crosstalk between the PAR2- and IL-4-mediated inflammatory axes in iKera, suggesting that iKera can be used as a platform for a broad range of mechanism-targeted drug screening in AD. SIGNIFICANCE STATEMENT: This is the first study to provide evidence that human induced pluripotent stem cell-derived keratinocyte-like cells (iKera) express functional protease-activated receptor 2 (PAR2). Furthermore, this study demonstrated in iKera that the IL-4 inflammatory axis can crosstalk with the PAR2-mediated inflammatory axis in keratinocytes. To the best of our knowledge, this is the first report to indicate that iKera can be used for research and as a drug screening platform for atopic dermatitis.
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Affiliation(s)
- Rio Nishimoto
- Innovative Regenerative Medicine, Kansai Medical University, Graduate School of Medicine, Osaka, Japan (R.N., C.K., H.Y., F.H.) and Osaka College of High-Technology, Osaka, Japan (R.N., C.K.)
| | - Chinatsu Kodama
- Innovative Regenerative Medicine, Kansai Medical University, Graduate School of Medicine, Osaka, Japan (R.N., C.K., H.Y., F.H.) and Osaka College of High-Technology, Osaka, Japan (R.N., C.K.)
| | - Hiromi Yamashita
- Innovative Regenerative Medicine, Kansai Medical University, Graduate School of Medicine, Osaka, Japan (R.N., C.K., H.Y., F.H.) and Osaka College of High-Technology, Osaka, Japan (R.N., C.K.)
| | - Fumiyuki Hattori
- Innovative Regenerative Medicine, Kansai Medical University, Graduate School of Medicine, Osaka, Japan (R.N., C.K., H.Y., F.H.) and Osaka College of High-Technology, Osaka, Japan (R.N., C.K.)
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14
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Verma P, Mori K, Kuwahara Y, Manzoli M, Morandi S, Fukuhara C, Raja R, Yamashita H. Amine functionalization within hierarchically‐porous zeotype framework for plasmonic catalysis over PdAu nanoparticles. ChemCatChem 2023. [DOI: 10.1002/cctc.202201182] [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: 01/04/2023]
Affiliation(s)
- Priyanka Verma
- Shizuoka Daigaku Chemical Engineering 3-5-1 Johuku 4328561 Hamamatsu JAPAN
| | - Kohsuke Mori
- Osaka University: Osaka Daigaku Materials and Manufacturing Science JAPAN
| | - Yasutaka Kuwahara
- Osaka University: Osaka Daigaku Materials and Manufacturing Science JAPAN
| | - Maela Manzoli
- University of Turin: Universita degli Studi di Torino Drug Science and Technology, NIS Center and INSTM Reference Center ITALY
| | - Sara Morandi
- University of Turin: Universita degli Studi di Torino Department of Chemistry, NIS Center and INSTM Reference Center ITALY
| | - Choji Fukuhara
- Shizuoka Daigaku Applied Chemistry and Biochemical Engineering JAPAN
| | - Robert Raja
- University of Southampton Chemistry UNITED KINGDOM
| | - Hiromi Yamashita
- Osaka University: Osaka Daigaku Materials and Manufacturing Science JAPAN
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15
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Bando K, Yamashita H, Tsumori M, Minoura H, Okumura K, Hattori F. Compact automated culture machine for human induced pluripotent stem cell maintenance and differentiation. Front Bioeng Biotechnol 2022; 10:1074990. [PMID: 36524054 PMCID: PMC9744792 DOI: 10.3389/fbioe.2022.1074990] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 10/20/2022] [Accepted: 11/11/2022] [Indexed: 08/06/2023] Open
Abstract
The technologies used to generate human induced pluripotent stem cell (iPSC) from somatic cells potentially enable the wide application of iPSC-derived differentiated cells in industrial research fields as a replacement for animals. However, as highly trained individuals are required to obtain reproducible results, this approach has limited social implementation. In the research field of iPSC, it is believed that documentable information is not enough for reproducing the quality of the differentiated cells. Therefore, automated culture machines for cell processing should make the starting of iPSC-using researches easier. We developed a programmable all-in-one automated culture machine, with dense and compact constitution that fits within a normal biosafety cabinet (200 mm wide, 233 mm height, and 110 mm depth). This instrument was fabricated using novel x-y-z-axes-rail-system, such as an overhead traveling crane, in a factory, which served as the main handling machinery. This machine enabled stable and efficient expansion of human iPSC under the feeder-free condition, without karyotype alterations, and simultaneously differentiated the cells into various cell types, including cardiomyocytes, hepatocytes, neural progenitors, and keratinocytes. Overall, this machine would facilitate the social implementation of human pluripotent stem cells and contribute to the accumulation of sharable knowledge for the standardization of the entire handling processes of iPSC in pharmaceutical, food, and cosmetic research.
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Affiliation(s)
- Kazunori Bando
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine, Osaka, Japan
| | - Hiromi Yamashita
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine, Osaka, Japan
| | - Motomu Tsumori
- New Business Promotion Center, Panasonic Production Engineering Co., Ltd., Osaka, Japan
| | - Hayase Minoura
- New Business Promotion Center, Panasonic Production Engineering Co., Ltd., Osaka, Japan
| | - Koji Okumura
- New Business Promotion Center, Panasonic Production Engineering Co., Ltd., Osaka, Japan
| | - Fumiyuki Hattori
- Innovative Regenerative Medicine, Kansai Medical University Graduate School of Medicine, Osaka, Japan
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16
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Kondo Y, Honda K, Kuwahara Y, Mori K, Kobayashi H, Yamashita H. Boosting Photocatalytic Hydrogen Peroxide Production from Oxygen and Water Using a Hafnium-Based Metal–Organic Framework with Missing-Linker Defects and Nickel Single Atoms. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04940] [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: 11/23/2022]
Affiliation(s)
- Yoshifumi Kondo
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
| | - Kotaro Honda
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama332-0012, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
| | - Hisayoshi Kobayashi
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka565-0871, Japan
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17
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Kondo Y, Kuwahara Y, Mori K, Yamashita H. Design of metal-organic framework catalysts for photocatalytic hydrogen peroxide production. Chem 2022. [DOI: 10.1016/j.chempr.2022.10.007] [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: 11/06/2022]
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18
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Abe M, Yamashita H, Jinno S, Custance O, Toki H. Reduction of noise induced by power supply lines using phase-locked loop. Rev Sci Instrum 2022; 93:113704. [PMID: 36461473 DOI: 10.1063/5.0124433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/09/2022] [Indexed: 06/17/2023]
Abstract
An experimental implementation for the reduction of power-line noise in delicate signal detection is presented. This implementation improves the signal-to-noise ratio without limiting the bandwidth of the measurement. A sinusoidal wave and its harmonics, both synchronized with the frequency of the power line, are used to cancel out the power supply noise induced in the measurement signal. The wave and the harmonics are generated via a phase-locked loop implementation. Their amplitude and phase are adjusted, and then they are added to the measurement signal using a series of operational amplifiers to compensate for the noise. Although we applied this method to the particular case of scanning tunneling microscopy measurements, considerably improving the image quality, our implementation can be applied to other measurement systems for which noise from the power lines can compromise the signal detection.
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Affiliation(s)
- M Abe
- Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-Cho, Toyonaka, Osaka 560-8531, Japan
| | - H Yamashita
- Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-Cho, Toyonaka, Osaka 560-8531, Japan
| | - S Jinno
- Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-Cho, Toyonaka, Osaka 560-8531, Japan
| | - O Custance
- National Institute of Materials Science (NIMS), Sengen 1-2-1, Tsukuba 305-0047, Japan
| | - H Toki
- Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama-Cho, Toyonaka, Osaka 560-8531, Japan
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19
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Chen Y, Guan S, Ge H, Chen X, Xu Z, Yue Y, Yamashita H, Yu H, Li H, Bian Z. Photocatalytic Dissolution of Precious Metals by TiO2 through Photogenerated Free Radicals. Angew Chem Int Ed Engl 2022; 61:e202213640. [DOI: 10.1002/anie.202213640] [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] [Received: 09/15/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Yao Chen
- Fudan University Chemistry Shanghai Normal University, no. 100 Guilin Road, Xuhui District, Shanghai CHINA
| | | | - Hao Ge
- Osaka University: Osaka Daigaku Graduate School of Engineering JAPAN
| | - Xiang Chen
- Shanghai Normal University Chemistry CHINA
| | | | | | - Hiromi Yamashita
- Osaka University: Osaka Daigaku Graduate School of Engineering JAPAN
| | - Han Yu
- Shanghai Normal University Chemistry CHINA
| | - Hexing Li
- Shanghai Normal University Chemistry CHINA
| | - Zhenfeng Bian
- Shanghai Normal University Chemistry No. 100, Guilin Road 200234 Shanghai CHINA
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20
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Chen Y, Guan S, Ge H, Chen X, Xu Z, Yue Y, Yamashita H, Yu H, Li H, Bian Z. Photocatalytic Dissolution of Precious Metals by TiO2 through Photogenerated Free Radicals. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202213640] [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: 11/07/2022]
Affiliation(s)
- Yao Chen
- Fudan University Chemistry Shanghai Normal University, no. 100 Guilin Road, Xuhui District, Shanghai CHINA
| | | | - Hao Ge
- Osaka University: Osaka Daigaku Graduate School of Engineering JAPAN
| | - Xiang Chen
- Shanghai Normal University Chemistry CHINA
| | | | | | - Hiromi Yamashita
- Osaka University: Osaka Daigaku Graduate School of Engineering JAPAN
| | - Han Yu
- Shanghai Normal University Chemistry CHINA
| | - Hexing Li
- Shanghai Normal University Chemistry CHINA
| | - Zhenfeng Bian
- Shanghai Normal University Chemistry No. 100, Guilin Road 200234 Shanghai CHINA
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21
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Nagumo Y, Kimura T, Ishikawa H, Sekino Y, Maruo K, Mathis B, Takemura M, Kageyama Y, Ushijima H, Kawai T, Yamashita H, Azuma H, Naiki T, Kobayashi Y, Inokuchi J, Osawa T, Kita Y, Tsuzuki T, Hashimoto K, Nishiyama H. 1740P Bladder preservation therapy in combination with atezolizumab and radiation therapy for invasive bladder cancer (BPT-ART): An open-label, single-arm, multicenter, phase II trial. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1818] [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: 11/01/2022] Open
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22
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Wen Y, Zhang T, Wang J, Pan Z, Wang T, Yamashita H, Qian X, Zhao Y. Electrochemical Reactors for Continuous Decentralized H 2 O 2 Production. Angew Chem Int Ed Engl 2022; 61:e202205972. [PMID: 35698896 DOI: 10.1002/anie.202205972] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 04/24/2022] [Indexed: 12/21/2022]
Abstract
The global utilization of H2 O2 is currently around 4 million tons per year and is expected to continue to increase in the future. H2 O2 is mainly produced by the anthraquinone process, which involves multiple steps in terms of alkylanthraquinone hydrogenation/oxidation in organic solvents and liquid-liquid extraction of H2 O2 . The energy-intensive and environmentally unfriendly anthraquinone process does not meet the requirements of sustainable and low-carbon development. The electrocatalytic two-electron (2 e- ) oxygen reduction reaction (ORR) driven by renewable energy (e.g. solar and wind power) offers a more economical, low-carbon, and greener route to produce H2 O2 . However, continuous and decentralized H2 O2 electrosynthesis still poses many challenges. This Minireview first summarizes the development of devices for H2 O2 electrosynthesis, and then introduces each component, the assembly process, and some optimization strategies.
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Affiliation(s)
- Yichan Wen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Ting Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jianying Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Zhelun Pan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Tianfu Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, 565-0871, Japan
| | - Xufang Qian
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yixin Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
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23
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Ge H, Kuwahara Y, Yamashita H. Development of defective molybdenum oxides for photocatalysis, thermal catalysis, and photothermal catalysis. Chem Commun (Camb) 2022; 58:8466-8479. [PMID: 35861347 DOI: 10.1039/d2cc02658a] [Citation(s) in RCA: 1] [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] [Indexed: 12/21/2022]
Abstract
The localized surface plasmon resonance (LSPR) of noble metals has been investigated for decades for applications in various catalysis reactions and optical research studies, but its development has been hampered by inefficient light absorption and high costs. In comparison, the creation of less expensive semiconductors (metal oxides) with strong plasmonic absorption is an appealing option, particularly defective molybdenum oxide (HxMoO3-y) has received considerable attention and investigation as a promising plasmonic material for a variety of catalytic reactions (photocatalysis, thermocatalysis, photothermal catalysis, etc.).The LSPR effect of HxMoO3-y can be tuned throughout a broad spectrum range from visible to near-infrared (NIR) by altering the doping amount by electrochemical control, chemical reduction, or photochemical control. Notably, defects (oxygen vacancies) in HxMoO3-y arise in conjunction with the LSPR effect, resulting in the formation of unique and useful active sites in a range of catalytic processes. In this review, we explore the formation mechanism of HxMoO3-y with plasmonic features and discuss its applications in photocatalysis, thermocatalysis, and photothermal catalysis.
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Affiliation(s)
- Hao Ge
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan.
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan. .,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.,JST, PRESTO, 4-1-8 Hon-Cho, Kawaguchi, Saitama 332-0012, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan. .,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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24
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Yamashita H, Xiao FS, Zhang J. The 1st Japan-China Symposium on Catalysis (1stJCSC), Virtual (Osaka, Japan), October 10–12, 2021. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Murase T, Shinba Y, Mitsuma M, Abe Y, Yamashita H, Ikematsu K. Wound age estimation based on chronological changes in chitinase 3-like protein 1 expression. Leg Med (Tokyo) 2022; 59:102128. [DOI: 10.1016/j.legalmed.2022.102128] [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] [Received: 05/31/2022] [Revised: 07/07/2022] [Accepted: 07/27/2022] [Indexed: 11/27/2022]
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26
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Uchida N, Hiraoka K, Sujino T, Yamashita H, Ishikawa T, Kawai K. P-199 Effect of the area of oocyte perivitelline space on the fertilization and embryo development following intracytoplasmic sperm injection. Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Study question
Does the area of oocyte perivitelline space have an effect on fertilization and embryo development following intracytoplasmic sperm injection?
Summary answer
The area of oocyte perivitelline space has not an effect on the fertilization but the embryo development following intracytoplasmic sperm injection.
What is known already
Oocyte perivitelline space has a lot of variation at intracytoplasmic sperm injection (ICSI). Some researchers reported that the characteristics of perivitelline space (large or small) affect embryo development, pregnancy, and implantation. However, these studies did not accurately calculate the area of perivitelline space. Therefore, little information is available on the effect of the area of oocyte perivitelline space on fertilization and embryo development following ICSI. The purpose of this study was to calculate and classify the area of oocyte perivitelline space and investigate the effect of the area of perivitelline space on fertilization and embryo development following ICSI.
Study design, size, duration
1. We retrospectively investigated 634 mature oocytes that were conducted ICSI between January 2021 and December 2021. The area of each oocyte perivitelline space was defined from between the area of circle calculated from the inner layer of zona pellucida and cytoplasm and divided into 3 groups (-9%, 10-19%, 20%-).
2. We retrospectively calculated the diameter of an inner layer of zona pellucida and cytoplasm and compared it with the 3 groups (-9%, 10-19%, 20%-).
Participants/materials, setting, methods
1. The fertilization, survival, good quality day-3 embryo, blastocyst, good quality blastocyst rates following ICSI were compared with the 3 groups (-9%, 10-19%, 20%-).
2. The average diameter of an inner layer of zona pellucida and cytoplasm of each oocyte for the 3 groups (-9%, 10-19%, 20%-) were compared.
The data were analyzed by Fisher’s exact test, residual analysis, one-way ANOVA test, with Bonferroni correction as appropriate to determine the statistical differences among groups.
Main results and the role of chance
1. The survival rates of perivitelline space -9%, 10-19%, 20%- groups were 100% (109/109), 96% (363/378), 94% (138/147), the fertilization rates were 89% (97/109), 88% (331/378), 86% (127/147), the good quality day-3 embryo rates were 56% (54/97), 70% (232/331), 70% (89/127) respectively. No significant difference was observed between these comparison items. The blastocyst rates of perivitelline space -9%, 10-19%, 20%- groups were 51% (47/92), 69% (222/321), 82% (93/114), the good quality blastocyst rates were 22% (20/92), 40% (129/321), 52% (59/114) respectively. The blastocyst and good quality blastocyst rates of perivitelline space -9% group showed significantly lower results. On the other hand, the blastocyst and good quality blastocyst rates of perivitelline space 20%- group showed significantly higher results.
2. The average diameter of an inner layer of zona pellucida of perivitelline space -9%, 10-19%, 20%- groups were 125 ± 4 µm, 129 ± 5 µm, 136 ± 6 µm, the average diameter of the cytoplasm of perivitelline space were 121 ± 4 µm, 119 ± 4 µm, 118 ± 4 µm respectively. Significant differences were observed in all pairs of groups of the average diameter of an inner layer of zona pellucida and cytoplasm.
Limitations, reasons for caution
The area of oocyte perivitelline space was calculated at only one plane.
Wider implications of the findings
Oocytes with narrow perivitelline space might have a wide region of adhesive between the cytoplasm surface and an inner layer of the zona pellucida which resulted in a smaller diameter of the zona pellucida and lower blastocyst rate by forming cytoplasmic fragments (Yumoto K et al. JARG. 2020 ;37(6):1349-1354.).
Trial registration number
Not Applicable
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Affiliation(s)
- N Uchida
- Kameda IVF Clinic Makuhari, ART Laboratory , Chiba, Japan
| | - K Hiraoka
- Kameda IVF Clinic Makuhari, ART Laboratory , Chiba, Japan
| | - T Sujino
- Kameda IVF Clinic Makuhari, ART Laboratory , Chiba, Japan
| | - H Yamashita
- H.U. Group Research Institute G.K., Research Laboratory , Tokyo, Japan
| | - T Ishikawa
- Tokyo Medical and Dental University, Comprehensive Reproductive Medicine , Tokyo, Japan
| | - K Kawai
- Kameda IVF Clinic Makuhari, ART Laboratory , Chiba, Japan
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27
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Wen Y, Zhang T, Wang J, Pan Z, Wang T, Yamashita H, Qian X, Zhao Y. Electrochemical reactors for continuously decentralized H2O2 production. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202205972] [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: 11/08/2022]
Affiliation(s)
- Yichan Wen
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Ting Zhang
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Jianying Wang
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Zhelun Pan
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Tianfu Wang
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Hiromi Yamashita
- Shanghai Jiao Tong University Division of Materials and Manufacturing Science, Graduate School of Engineering CHINA
| | - Xufang Qian
- Shanghai Jiao Tong University School of Environmental Science and Engineering CHINA
| | - Yixin Zhao
- Shanghai Jiao Tong University Environmental Science and Engineering 800 Dongchuan Road 44106 Shanghai CHINA
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28
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Tamaki K, Verma P, Yoshii T, Shimojitosho T, Kuwahara Y, Mori K, Yamashita H. Design of Au nanorods-based plasmonic catalyst in combination with nanohybrid Pd-rGO layer for boosting CO2 hydrogenation to formic acid under visible light irradiation. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.06.010] [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: 11/02/2022]
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29
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Verma P, Tamaki K, Shimojitosho T, Yoshii T, Kuwahara Y, Mori K, Yamashita H. Size effects in plasmonic gold nanorod based Pd-rGO hybrid catalyst for promoting visible-light-driven Suzuki-Miyaura coupling reaction. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.05.028] [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: 11/02/2022]
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30
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Maruta H, Abe R, Yamashita H. Effect of Long-Term Supplementation with Acetic Acid on the Skeletal Muscle of Aging Sprague Dawley Rats. Int J Mol Sci 2022; 23:ijms23094691. [PMID: 35563082 PMCID: PMC9101554 DOI: 10.3390/ijms23094691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/14/2022] [Accepted: 04/21/2022] [Indexed: 12/10/2022] Open
Abstract
Mitochondrial function in skeletal muscle, which plays an essential role in oxidative capacity and physical activity, declines with aging. Acetic acid activates AMP-activated protein kinase (AMPK), which plays a key role in the regulation of whole-body energy by phosphorylating key metabolic enzymes in both biosynthetic and oxidative pathways and stimulates gene expression associated with slow-twitch fibers and mitochondria in skeletal muscle cells. In this study, we investigate whether long-term supplementation with acetic acid improves age-related changes in the skeletal muscle of aging rats in association with the activation of AMPK. Male Sprague Dawley (SD) rats were administered acetic acid orally from 37 to 56 weeks of age. Long-term supplementation with acetic acid decreased the expression of atrophy-related genes, such as atrogin-1, muscle RING-finger protein-1 (MuRF1), and transforming growth factor beta (TGF-β), activated AMPK, and affected the proliferation of mitochondria and type I fiber-related molecules in muscles. The findings suggest that acetic acid exhibits an anti-aging function in the skeletal muscles of aging rats.
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Affiliation(s)
- Hitomi Maruta
- Department of Nutritional Science, Faculty of Health and Welfare Science, Okayama Prefectural University, 111 Kuboki, Soja 719-1197, Okayama, Japan;
| | - Reina Abe
- Graduate School of Health and Welfare Science, Okayama Prefectural University, 111 Kuboki, Soja 719-1197, Okayama, Japan;
| | - Hiromi Yamashita
- Department of Nutritional Science, Faculty of Health and Welfare Science, Okayama Prefectural University, 111 Kuboki, Soja 719-1197, Okayama, Japan;
- Graduate School of Health and Welfare Science, Okayama Prefectural University, 111 Kuboki, Soja 719-1197, Okayama, Japan;
- Correspondence: ; Tel.: +81-866-94-2150
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31
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Hashim ZH, Kuwahara Y, Hanaki A, Mohamed AR, Yamashita H. Synthesis of a CaO-Fe2O3-SiO2 composite from a dephosphorization slag for adsorption of CO2. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.03.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Zhang T, Wen Y, Pan Z, Kuwahara Y, Mori K, Yamashita H, Zhao Y, Qian X. Overcoming Acidic H 2O 2/Fe(II/III) Redox-Induced Low H 2O 2 Utilization Efficiency by Carbon Quantum Dots Fenton-like Catalysis. Environ Sci Technol 2022; 56:2617-2625. [PMID: 35098712 DOI: 10.1021/acs.est.1c06276] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Fenton reaction has important implications in biology- and environment-related remediation. Hydroxyl radicals (•OH) and hydroxide (OH-) were formed by a reaction between Fe(II) and hydrogen peroxide (H2O2). The acidic H2O2/Fe(II/III) redox-induced low H2O2 utilization efficiency is the bottleneck of Fenton reaction. Electron paramagnetic resonance, surface-enhanced Raman scattering, and density functional theory calculation indicate that the unpaired electrons in the defects of carbon quantum dots (CQDs) and the carboxylic groups at the edge have a synergistic effect on CQDs Fenton-like catalysis. This leads to a 33-fold higher H2O2 utilization efficiency in comparison with Fe(II)/H2O2 Fenton reaction, and the pseudo-first-order reaction rate constant (kobs) increases 38-fold that of Fe(III)/H2O2 under equivalent conditions. The replacement of acidic H2O2/Fe(II/III) redox with CQD-mediated Fe(II/III) redox improves the sluggish Fe(II) generation. Highly effective production of •OH in CQDs-Fe(III)/H2O2 dramatically decreases the selectivity of toxic intermediate benzoquinone. The inorganic ions and dissolved organic matter (DOM) in real groundwater show negligible effects on the CQDs Fenton-like catalysis process. This work presents a process with a higher efficiency of utilization of H2O2in situ chemical oxidation (ISCO) to remove persistent organic pollutants.
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Affiliation(s)
- Ting Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
| | - Yichan Wen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
| | - Zhelun Pan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yixin Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P.R. China
| | - Xufang Qian
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P.R. China
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33
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Yin H, Chen Z, Peng Y, Xiong S, Li Y, Yamashita H, Li J. Dual Active Centers Bridged by Oxygen Vacancies of Ruthenium Single‐Atom Hybrids Supported on Molybdenum Oxide for Photocatalytic Ammonia Synthesis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Haibo Yin
- State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China
| | - Zhen Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China
| | - Shangchao Xiong
- State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China
| | - Yadong Li
- Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Osaka 565-0871 Japan
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 P. R. China
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34
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Yin H, Zhao X, Xiong S, Peng Y, Chen Z, Wang R, Wen M, Luo J, Yamashita H, Li J. New insight on electroreduction of nitrate to ammonia driven by oxygen vacancies-induced strong interface interactions. J Catal 2022. [DOI: 10.1016/j.jcat.2021.12.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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35
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Yamazaki Y, Toyonaga T, Doshita N, Mori K, Kuwahara Y, Yamazaki S, Yamashita H. Crystal Facet Engineering and Hydrogen Spillover-Assisted Synthesis of Defective Pt/TiO 2-x Nanorods with Enhanced Visible Light-Driven Photocatalytic Activity. ACS Appl Mater Interfaces 2022; 14:2291-2300. [PMID: 34967219 DOI: 10.1021/acsami.1c20148] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Hydrogen spillover can assist the introduction of defects such as Ti3+ and concomitant oxygen vacancies (VO) in a TiO2 crystal, thereby inducing a new level below the conduction band to improve the conductivity of photogenerated electrons and the visible light absorption property of TiO2. Meanwhile, crystal facet engineering offers a promising approach to achieve improved activity by influencing the recombination step of the photogenerated electrons and holes. In this study, with the aim of achieving enhanced visible light-driven photocatalytic activity, rutile TiO2 nanorods with different aspect ratios were synthesized by crystal facet engineering, and Pt-deposited TiO2-x nanorods (Pt/TNR) were then obtained via reduction treatment assisted by hydrogen spillover. The reduction treatment at 200 °C induced the formation of surface Ti3+ exclusively, whereas surface Ti3+ and VO were formed by performing the reduction at 600 °C. The Pt/TNR with a higher aspect ratio reduced at 200 °C exhibited the highest activity in photocatalytic H2 production under visible light irradiation owing to the synergistic effect of the introduction of Ti3+ defects and the spatial charge carrier separation induced by crystal facet engineering.
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Affiliation(s)
- Yukari Yamazaki
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
| | - Tetsuya Toyonaga
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
| | - Naoto Doshita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
- Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Suzuko Yamazaki
- Division of Natural Science, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
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36
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Shun K, Mori K, Masuda S, Hashimoto N, Hinuma Y, Kobayashi H, Yamashita H. Revealing hydrogen spillover pathways in reducible metal oxides. Chem Sci 2022; 13:8137-8147. [PMID: 35919430 PMCID: PMC9278487 DOI: 10.1039/d2sc00871h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 06/08/2022] [Indexed: 12/15/2022] Open
Abstract
Hydrogen spillover, the migration of dissociated hydrogen atoms from noble metals to their support materials, is a ubiquitous phenomenon and is widely utilized in heterogeneous catalysis and hydrogen storage materials. However, in-depth understanding of the migration of spilled hydrogen over different types of supports is still lacking. Herein, hydrogen spillover in typical reducible metal oxides, such as TiO2, CeO2, and WO3, was elucidated by combining systematic characterization methods involving various in situ techniques, kinetic analysis, and density functional theory calculations. TiO2 and CeO2 were proven to be promising platforms for the synthesis of non-equilibrium RuNi binary solid solution alloy nanoparticles displaying a synergistic promotional effect in the hydrolysis of ammonia borane. Such behaviour was driven by the simultaneous reduction of both metal cations under a H2 atmosphere over TiO2 and CeO2, in which hydrogen spillover favorably occurred over their surfaces rather than within their bulk phases. Conversely, hydrogen atoms were found to preferentially migrate within the bulk prior to the surface over WO3. Thus, the reductions of both metal cations occurred individually on WO3, which resulted in the formation of segregated NPs with no activity enhancement. The hydrogen spillover pathway in typical reducible metal oxides, such as TiO2, CeO2, and WO3, was investigated by combining various in situ characterization techniques, kinetic analysis, and density functional theory calculations.![]()
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Affiliation(s)
- Kazuki Shun
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Shinya Masuda
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Naoki Hashimoto
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yoyo Hinuma
- Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Hisayoshi Kobayashi
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
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37
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Kondo Y, Hino K, Kuwahara Y, Mori K, Kobayashi H, Yamashita H. Lewis acid-triggered photocatalytic hydrogen peroxide production in an aluminum-based metal–organic framework. Chem Commun (Camb) 2022; 58:12345-12348. [DOI: 10.1039/d2cc04454d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Al-based MIL-101-NH2, which was previously regarded as having silent photo-features, exhibits photocatalytic H2O2 production via O2 reduction accompanied by efficient suppression of undesired H2O2 decomposition.
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Affiliation(s)
- Yoshifumi Kondo
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kenta Hino
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasutaka Kuwahara
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Kohsuke Mori
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hisayoshi Kobayashi
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiromi Yamashita
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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38
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Kuwahara Y, Okada M, Ge H, Yamashita H. Hydrodeoxygenation of Aromatic Ketones under Mild Conditions over Pd-loaded Hydrogen Molybdenum Bronze with Plasmonic Features. CHEM LETT 2021. [DOI: 10.1246/cl.210706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012
| | - Masahiro Okada
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
| | - Hao Ge
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520
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39
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Yin H, Chen Z, Peng Y, Xiong S, Yamashita H, Li J. Dual Active Centers Bridged by Oxygen Vacancies of Ru Single Atoms Hybrids Supported on Molybdenum Oxide for Photocatalytic Ammonia Synthesis. Angew Chem Int Ed Engl 2021; 61:e202114242. [PMID: 34918452 DOI: 10.1002/anie.202114242] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [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: 10/20/2021] [Indexed: 11/09/2022]
Abstract
Photocatalytic synthesis of ammonia (NH 3 ) holds significant potential compared with the Haber-Bosch process. However, the reported photocatalysts suffered from low efficiency owing to localized electrons deficiency. Here, Ru-SA (single atoms)/H x MoO 3-y hybrids with abundant of Mo n+ (n < 6) species neighboring oxygen vacancies (O V ) are synthesized via a H-spillover process. Detailed characterizations demonstrate that Ru-SA/H x MoO 3 y hybrids can quantitatively produce NH 3 from N 2 and H 2 by the synergetic effect of dual active centers (Ru SA and Mo n+ ). That is, Ru SA boost the activation and migration of H 2 , and Mo n+ species act as the trapping sites of localized electrons and the adsorption and dissociation sites of N 2 , finally leading to NH 3 synthesis on Mo n+ -OH. The NH 3 generation rate is as high as 4.0 mmol h -1 g -1 , accompanied by an apparent quantum efficiency over 6.0% at 650 nm. Our finding may open up a new strategy for acquiring a better NH 3 synthesis approach under mild conditions.
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Affiliation(s)
- Haibo Yin
- Tsinghua University, School of environment, CHINA
| | - Zhen Chen
- Tsinghua University, School of environment, CHINA
| | - Yue Peng
- Tsinghua University, School of environment, CHINA
| | | | - Hiromi Yamashita
- Osaka University: Osaka Daigaku, Graduate School of Engineering, JAPAN
| | - Junhua Li
- Tsinghua University, School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, 100084, Beijing, CHINA
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40
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Wang R, Kuwahara Y, Mori K, Yamashita H. Semiconductor‐based Photoanodes Modified with Metal‐Organic Frameworks and Molecular Catalysts as Cocatalysts for Enhanced Photoelectrochemical Water Oxidation Reaction. ChemCatChem 2021. [DOI: 10.1002/cctc.202101033] [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: 11/06/2022]
Affiliation(s)
- Ruiling Wang
- Division of Material and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Yasutaka Kuwahara
- Division of Material and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Innovative Catalysis Science Division Institute for Open and Transdisciplinary Research Initiatives (OTRI) Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Elements Strategy Initiative for Catalysts & Batteries (ESICB) Kyoto University Katsura Kyoto 615-8520 Japan
- Japan Science and Technology Agency (JST) PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
| | - Kohsuke Mori
- Division of Material and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Innovative Catalysis Science Division Institute for Open and Transdisciplinary Research Initiatives (OTRI) Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Elements Strategy Initiative for Catalysts & Batteries (ESICB) Kyoto University Katsura Kyoto 615-8520 Japan
| | - Hiromi Yamashita
- Division of Material and Manufacturing Science Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Innovative Catalysis Science Division Institute for Open and Transdisciplinary Research Initiatives (OTRI) Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
- Elements Strategy Initiative for Catalysts & Batteries (ESICB) Kyoto University Katsura Kyoto 615-8520 Japan
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Verma P, Zhang S, Song S, Mori K, Kuwahara Y, Wen M, Yamashita H, An T. Recent strategies for enhancing the catalytic activity of CO2 hydrogenation to formate/formic acid over Pd-based catalyst. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101765] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Wada A, Yamashita H, Togashi A, Ogawa S, Muroi A, Kido S, Furuya S. The effect of parenteral amino acid infusion combined with intermittent loading exercise on postoperative sarcopenic rat models. Clin Nutr ESPEN 2021. [DOI: 10.1016/j.clnesp.2021.09.111] [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: 10/19/2022]
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Nakajima E, Yamashita H, Sato H. Characteristic evaluation of a simple hand-made semiconductor dosimeter for mammography. J Radiol Prot 2021; 41:1018-1033. [PMID: 34428750 DOI: 10.1088/1361-6498/ac20b2] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Daily quality control of mammography equipment is important for providing optimal images and determining appropriate doses. To popularise dosimeters, the Measurement Division, the Japanese Society of Radiological Technology hold a seminar on making simple dosimeters. At this seminar, a hand-made dosimeter for mammography (HD-M) can be made at low cost. However, HD-Ms employ semiconductors, and their energy responses are subject to significant variations. This investigation involved the determination of precautions when using HD-Ms, examining their energy response characteristics and measurable energy ranges. HD-M has four types of selectors for response correction. When the selector and the tube voltage were equal, the HD-M readings matched that of the ionisation chamber within 5%. However, in case of target filter combinations and measuring tube voltages that the selector does not support, the HD-M readings differed by up to 53% from the ionisation chamber values. HD-M may use different measurement circuits and semiconductor elements depending on the time of the seminar. In this study, it was clarified that the correction factork, which is the average value of the ratio of the measured value of the ionisation chamber dosimeter to the measured value of HD-M, changes from 0.62 to 1.53 depending on irradiation conditions such as the combination of target filters and the tube voltage. It was demonstrated that HD-M functions sufficiently as a dosimeter for daily management by determining the correction factor using the method proposed in this study.
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Affiliation(s)
- Erika Nakajima
- Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami Amimachi, Inashiki, Ibaraki Prefecture 〒300-0394, Japan
| | - Hiromi Yamashita
- JA Toride Medical Center, 2-1-1 Hongo, Toride, Ibaraki Prefecture 〒302-0022, Japan
| | - Hitoshi Sato
- Graduate School of Health Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami Amimachi, Inashiki, Ibaraki Prefecture 〒300-0394, Japan
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Yamazaki Y, Mori K, Kuwahara Y, Kobayashi H, Yamashita H. Defect Engineering of Pt/TiO 2-x Photocatalysts via Reduction Treatment Assisted by Hydrogen Spillover. ACS Appl Mater Interfaces 2021; 13:48669-48678. [PMID: 34615345 DOI: 10.1021/acsami.1c13756] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Defect engineering of metal oxides is a facile and promising strategy to improve their photocatalytic activity. In the present study, Pt/TiO2-x was prepared by a reduction treatment assisted by hydrogen spillover to pure rutile, anatase, and brookite and was subsequently used for hydrogen production from an aqueous methanol solution. With increasing reduction temperature, the photocatalytic activity of the rutile Pt/TiO2-x increased substantially, whereas the activity of anatase Pt/TiO2-x decreased and that of brookite Pt/TiO2-x was independent of the treatment temperature. Electron-spin resonance analysis revealed that rutile and brookite possess similar defect sites (Ti3+ and concomitant oxygen vacancy) after the reduction at 600 °C, whereas different resonance signals were observed for anatase after the reduction at 600 °C. During the reduction process, electrons donated from spillover hydrogen migrate between the conduction band and the inherent midgap states. This research demonstrates that the depth of the inherent midgap states, depending on the crystal phases, influences the generation of defects, which play a key role in the photocatalytic performance of Pt/TiO2-x.
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Affiliation(s)
- Yukari Yamazaki
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Hisayoshi Kobayashi
- Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Osaka 565-0871, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (ICS-OTRI), Osaka University, Suita, Osaka 565-0871, Japan
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Yamashita H, Murase T, Kondo H, Umehara T, Abe Y, Shingu K, Shinba Y, Mitsuma M, Ikematsu K. Development of age-estimation formula using postmortem oral findings: A pilot study. Leg Med (Tokyo) 2021; 54:101973. [PMID: 34689115 DOI: 10.1016/j.legalmed.2021.101973] [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: 06/25/2021] [Revised: 09/01/2021] [Accepted: 10/01/2021] [Indexed: 10/20/2022]
Abstract
The goal of this pilot study was to develop an age-estimation formula and assess its effectiveness after evaluating individual intraoral findings. A total of 198 Japanese adults were included, and intraoral findings were collected from the corpses. To analyze the condition of each tooth, 20 items were established for intraoral findings, and seven tooth states were established. Logistic regression analysis was used to estimate the impact of age on each intraoral finding. Sequentially, linear regression was applied to verify the correlation between age and type of tooth, and multiple regression was used to correlate age-dependent factors. The intraoral findings with age dependency were tooth stump, edentulous jaw, attrition, no caries, dental prostheses, partial dentures, and complete dentures. Tooth stump, attrition, and dental prostheses showed positive multicollinearity. Missing tooth, extant tooth, normal teeth, and untreated lost teeth were age-correlated. Multiple regression analysis included age as the response variable and five factors as the explanatory variables in a new age-estimation formula, resulting in ± 10 years for 86.96% of cases (60-69 years old), 76.47% (70-79 years old), and 61.05% of all cases. The multiple correlation was 0.551, and the contribution rate of the multiple regression formula was 0.304. The accuracy of the proposed age-estimation formula was within ± 10 years for 61.05% of all subjects. However, the accuracy of age estimation in subjects aged 60-79 years was excellent (76.47-86.96%), which showed that this age-estimation formula would be effective for estimating the age of middle-aged to older subjects.
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Affiliation(s)
- Hiromi Yamashita
- Department of Forensic Dental Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan.
| | - Takehiko Murase
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Hisayoshi Kondo
- Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Takahiro Umehara
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Yuki Abe
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Keita Shingu
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Yoriko Shinba
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Masahide Mitsuma
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
| | - Kazuya Ikematsu
- Department of Forensic Pathology and Science, Unit of Social Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, 1-12-4 Sakamoto, Nagasaki 852-8523, Japan
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Momoi Y, Tsusaki T, Yamashita H, Takahashi H. The effectiveness of an SNP marker in the cholecystokinin type A receptor gene for improving growth traits in Amakusa Daioh cross chickens. J APPL POULTRY RES 2021. [DOI: 10.1016/j.japr.2021.100166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Yamashita H, Zeredo JLL, Toda K. Age Differences in Naloxone Reversibility of Electroacupuncture on the Jaw Opening Reflex in Rats. J Acupunct Meridian Stud 2021; 14:167-172. [DOI: 10.51507/j.jams.2021.14.4.167] [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] [Received: 04/05/2021] [Revised: 05/11/2021] [Accepted: 06/29/2021] [Indexed: 11/03/2022] Open
Affiliation(s)
- Hiromi Yamashita
- Forensic Dental Science, Institute of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Jorge Luis Lopes Zeredo
- Graduate Program in Health Science and Technology, Ceilandia Campus, University of Brasilia, Brasilia, Brazil
| | - Kazuo Toda
- Integrative Sensory Physiology, Institute of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
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Verma P, Kondo Y, Kuwahara Y, Kamegawa T, Mori K, Raja R, Yamashita H. Design and application of photocatalysts using porous materials. Catalysis Reviews 2021. [DOI: 10.1080/01614940.2021.1948302] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Priyanka Verma
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
- School of Chemistry, University of Southampton, Southampton, UK
| | - Yoshifumi Kondo
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
- Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Kyoto, Japan
- Jst, Presto, Saitama, Japan
| | - Takashi Kamegawa
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, Japan
| | - Kohsuke Mori
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
- Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Kyoto, Japan
| | - Robert Raja
- School of Chemistry, University of Southampton, Southampton, UK
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Osaka, Japan
- Elements Strategy Initiative for Catalysts & Batteries ESICB, Kyoto University, Kyoto, Japan
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Kuwahara Y, Mihogi T, Hamahara K, Kusu K, Kobayashi H, Yamashita H. A quasi-stable molybdenum sub-oxide with abundant oxygen vacancies that promotes CO 2 hydrogenation to methanol. Chem Sci 2021; 12:9902-9915. [PMID: 34349963 PMCID: PMC8317622 DOI: 10.1039/d1sc02550c] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [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: 05/09/2021] [Accepted: 06/26/2021] [Indexed: 11/21/2022] Open
Abstract
Production of methanol from anthropogenic carbon dioxide (CO2) is a promising chemical process that can alleviate both the environmental burden and the dependence on fossil fuels. In catalytic CO2 hydrogenation to methanol, reduction of CO2 to intermediate species is generally considered to be a crucial step. It is of great significance to design and develop advanced heterogeneous catalysts and to engineer the surface structures to promote CO2-to-methanol conversion. We herein report an oxygen-defective molybdenum sub-oxide coupled with Pt nanoparticles (Pt/HxMoO3−y) which affords high methanol yield with a methanol formation rate of 1.53 mmol g-cat−1 h−1 in liquid-phase CO2 hydrogenation under relatively mild reaction conditions (total 4.0 MPa, 200 °C), outperforming other oxide-supported Pt catalysts in terms of both the yield and selectivity for methanol. Experiments and comprehensive analyses including in situ X-ray absorption fine structure (XAFS), in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and density functional theory (DFT) calculations reveal that both abundant surface oxygen vacancies (VO) and the redox ability of Mo species in quasi-stable HxMoO3−y confer the catalyst with enhanced adsorption and activation capability to subsequently transform CO2 to methanol. Moreover, the Pt NPs act as H2 dissociation sites to regenerate oxygen vacancies and as hydrogenation sites for the CO intermediate to finally afford methanol. Based on the experimental and computational studies, an oxygen-vacancy-mediated “reverse Mars–van Krevelen (M–vK)” mechanism is proposed. This study affords a new strategy for the design and development of an efficient heterogeneous catalyst for CO2 conversion. Oxygen-defective molybdenum sub-oxide coupled with Pt nanoparticles affords high methanol yield in liquid-phase CO2 hydrogenation via reverse Mars–van Krevelen mechanism.![]()
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Affiliation(s)
- Yasutaka Kuwahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan .,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan.,Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University Katsura Kyoto 615-8520 Japan.,JST, PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
| | - Takashi Mihogi
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan
| | - Koji Hamahara
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan
| | - Kazuki Kusu
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan
| | - Hisayoshi Kobayashi
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan .,Kyoto Institute of Technology Matsugasaki, Sakyo-ku Kyoto 606-8585 Japan
| | - Hiromi Yamashita
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan .,Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan.,Unit of Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University Katsura Kyoto 615-8520 Japan
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Sakai H, Yamashita H, Nakajima S, Takahashi Y, Kaneko H. AB0391 LOW SERUM COMPLEMENT C3 LEVEL AS A RISK FACTOR FOR RELAPSE OF ANTINEUTROPHIL CYTOPLASMIC ANTIBODY-ASSOCIATED VASCULITIS: A RETROSPECTIVE COHORT STUDY. Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.1517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:The alternative pathway of complement activation has recently been recognized as a key pathogenic event in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). Some previous studies have reported that low serum complement C3 level in AAV patients is associated with more severe renal disease, worse renal prognosis, or higher mortality. However, the correlation between low serum C3 level and AAV relapse remains unclear.Objectives:To analyze the clinical characteristics and outcomes of AAV patients with low serum C3 levels at the time of diagnosis.Methods:We conducted a retrospective observational cohort study including 83 consecutive patients diagnosed with AAV in our hospital from January 1999 to December 2020. Serum C3 levels were measured at diagnosis. AAV included microscopic polyangiitis (MPA), granulomatosis with polyangiitis (GPA), and eosinophilic granulomatosis with polyangiitis (EGPA); patients with ANCA-negative AAV were excluded. Patients were divided into low- and high-C3 groups (C3 < 100 and ≥ 100 mg/dL, respectively). We compared the clinical characteristics, and relapse-free and overall survival rates, of the two groups, and identified predictors of AAV relapse.Results:Of the 83 patients (MPA, n = 61; GPA, n = 18; EGPA, n = 4), 20 (24%) were in the low-C3 group. We found no significant group difference in sex, body mass index, disease type, ANCA subtype, Birmingham Vasculitis Activity Score (BVAS), or treatment. The low-C3 group patients were older (p=0.01), and had a higher Five Factor Score (FFS) (p=0.01) and a lower remission rate (p=0.02), than the high-C3 group. The generalized Wilcoxon test revealed that the relapse-free survival time was significantly shorter in the low-C3 group (29 months; 95% confidence interval [CI]: 15–49) than in the high-C3 group (82 months; 95% CI: 61–NA; p=0.01) (Figure 1A). The overall survival was also shorter in the low-C3 group (83 months; 95% CI: 8-121) than in the high-C3 group (112 months; 95% CI: 77-NA; p=0.03) (Figure 1B). In the Cox proportional hazards model, a low C3 level (< 100 mg/dL) (hazard ratio [HR], 3.01; 95% CI: 1.29–7.04], p=0.01) and GPA (HR, 3.04; 95% CI: 1.32–7.01; p=0.01) were independent predictors of AAV relapse.Figure 1.Kaplan-Meier estimates of the relapse-free (A) and overall (B) survival rates of AAV patients by baseline serum C3 levels. Eight patients who did not show remission were excluded in the relapse-free survival analysis. Black line: high-C3 group (≥ 100 mg/dL); red line: low-C3 group (< 100 mg/dL).Conclusion:AAV patients with low C3 levels at diagnosis were at higher risk of relapse. Larger prospective studies are required to confirm these findings.Disclosure of Interests:None declared
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