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Kaneko S, Hirotaka S, Tsujii M, Maruyama H, Uozumi N, Arai F. Instantaneous extracellular solution exchange for concurrent evaluation of membrane permeability of single cells. Lab Chip 2024; 24:281-291. [PMID: 38086698 DOI: 10.1039/d3lc00633f] [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] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
The osmotic stress imposed on microorganisms by hypotonic conditions is perceived to regulate water and solute flux via cell membranes, which are crucial for survival. Some cells that fail to perceive osmotic stress die because this results in the rupture of the cell membrane. The flux through the membrane is characterized by the membrane permeability, which is measured using a stopped-flow apparatus in response to a millisecond-order osmolarity change. However, the obtained data are an ensemble average of each cell response. Additionally, the measurement of permeability, considering cellular viability, contributes to a more accurate evaluation of osmoadaptation. Here, we present a novel on-chip instantaneous extracellular solution exchange method using an air-liquid interface. The presented method provides a concurrent evaluation at the single-cell level in response to a millisecond-order osmotic shock, considering cellular viability by solution exchange. This method utilizes a liquid bridge with a locally formed droplet on the surface of a micropillar fabricated inside a microchannel. We evaluated a solution exchange time of 3.6 ms and applied this method to Synechocystis PCC 6803 under two different osmolarity conditions. The live/dead ratio of 1 M to 0.5 M osmotic down shock condition was 78.8/21.2% while that of 1 M to 0.25 M osmotic down shock condition was 40.0/60.0%. We evaluated the water permeability of two groups: cells that were still live before and after osmotic shock (hereafter named cell type 1), and cells that were live before but were dead 10 minutes after osmotic shock (hereafter named cell type 2). The results indicated that the water permeability of cell type 2 was higher than that of cell type 1. The results obtained using the presented methods confirmed that the effect of osmotic stress can be accurately evaluated using single-cell analysis.
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Affiliation(s)
- Shingo Kaneko
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Sugiura Hirotaka
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Masaru Tsujii
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, 6-6-07, Aobayama, Aoba-ku, Sendai 980-8579, Japan
| | - Hisataka Maruyama
- Department of Micro-Nano Mechanical Science and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Nobuyuki Uozumi
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, 6-6-07, Aobayama, Aoba-ku, Sendai 980-8579, Japan
| | - Fumihito Arai
- Department of Mechanical Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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2
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Du X, Kaneko S, Maruyama H, Sugiura H, Tsujii M, Uozumi N, Arai F. Integration of Microfluidic Chip and Probe with a Dual Pump System for Measurement of Single Cells Transient Response. Micromachines (Basel) 2023; 14:1210. [PMID: 37374795 DOI: 10.3390/mi14061210] [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: 05/12/2023] [Revised: 06/03/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023]
Abstract
The integration of liquid exchange and microfluidic chips plays a critical role in the biomedical and biophysical fields as it enables the control of the extracellular environment and allows for the simultaneous stimulation and detection of single cells. In this study, we present a novel approach for measuring the transient response of single cells using a system integrated with a microfluidic chip and a probe with a dual pump. The system was composed of a probe with a dual pump system, a microfluidic chip, optical tweezers, an external manipulator, an external piezo actuator, etc. Particularly, we incorporated the probe with the dual pump to allow for high-speed liquid change, and the localized flow control enabled a low disturbance contact force detection of single cells on the chip. Using this system, we measured the transient response of the cell swelling against the osmotic shock with a very fine time resolution. To demonstrate the concept, we first designed the double-barreled pipette, which was assembled with two piezo pumps to achieve a probe with the dual pump system, allowing for simultaneous liquid injection and suction. The microfluidic chip with on-chip probes was fabricated, and the integrated force sensor was calibrated. Second, we characterized the performance of the probe with the dual pump system, and the effect of the analysis position and area of the liquid exchange time was investigated. In addition, we optimized the applied injection voltage to achieve a complete concentration change, and the average liquid exchange time was achieved at approximately 3.33 ms. Finally, we demonstrated that the force sensor was only subjected to minor disturbances during the liquid exchange. This system was utilized to measure the deformation and the reactive force of Synechocystis sp. strain PCC 6803 in osmotic shock, with an average response time of approximately 16.33 ms. This system reveals the transient response of compressed single cells under millisecond osmotic shock which has the potential to characterize the accurate physiological function of ion channels.
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Affiliation(s)
- Xu Du
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Shingo Kaneko
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Hisataka Maruyama
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Hirotaka Sugiura
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Masaru Tsujii
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Nobuyuki Uozumi
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Fumihito Arai
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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3
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Sato Y, Sumikawa H, Shibaki R, Morimoto T, Sakata Y, Oya Y, Tamiya M, Suzuki H, Matsumoto H, Kijima T, Hashimoto K, Kobe H, Hino A, Inaba M, Tsukita Y, Ikeda H, Arai D, Maruyama H, Sakata S, Fujimoto D. 1103P Drug-related pneumonitis induced by osimertinib as first-line treatment for EGFR-positive non-small cell lung cancer: A real-world setting. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.1228] [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: 11/27/2022] Open
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4
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Maruyama H, Arai F. Fluorescence oxygen sensor array for non-contact and rapid measurement of oxygen consumption rate of single oocyte. Communications in Information and Systems 2022. [DOI: 10.4310/cis.2022.v22.n4.a2] [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: 01/19/2023]
Affiliation(s)
- Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Aichi, Japan
| | - Fumihito Arai
- Department of Mechanical Engineering, University of Tokyo, Bunkyo-ku, Tokyo, Japan
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Kumon H, Sakuma S, Nakamura S, Maruyama H, Eto K, Arai F. Microfluidic Bioreactor Made of Cyclo-Olefin Polymer for Observing On-Chip Platelet Production. Micromachines (Basel) 2021; 12:1253. [PMID: 34683304 PMCID: PMC8540318 DOI: 10.3390/mi12101253] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 11/16/2022]
Abstract
We previously proposed a microfluidic bioreactor with glass-Si-glass layers to evaluate the effect of the fluid force on platelet (PLT) production and fabricated a three-dimensional (3D) microchannel by combining grayscale photolithography and deep reactive ion etching. However, a challenge remains in observing the detailed process of PLT production owing to the low visibility of the microfluidic bioreactor. In this paper, we present a transparent microfluidic bioreactor made of cyclo-olefin polymer (COP) with which to observe the process of platelet-like particle (PLP) production under a bright-field, which allows us to obtain image data at a high sampling rate. We succeeded in fabricating the COP microfluidic bioreactor with a 3D microchannel. We investigated the bonding strength of COP-COP layers and confirmed the effectiveness of the microfluidic bioreactor. Results of on-chip PLP production using immortalized megakaryocyte cell lines (imMKCLs) derived from human-induced pluripotent stem cells show that the average total number of produced PLPs per imMKCL was 17.6 PLPs/imMKCL, which is comparable to that of our previous glass-Si-glass microfluidic bioreactor (17.4 PLPs/imMKCL). We succeeded in observing PLP production under a bright-field using the presented microfluidic bioreactor and confirmed that PLP fragmented in a narrow area of proplatelet-like protrusions.
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Affiliation(s)
- Hiroki Kumon
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan;
| | - Shinya Sakuma
- Department of Mechanical Engineering, Kyushu University, Fukuoka 819-0395, Japan;
| | - Sou Nakamura
- Center for iPS Cell Research and Application, Kyoto University, Kyoto 606-8507, Japan; (S.N.); (K.E.)
| | - Hisataka Maruyama
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan;
| | - Koji Eto
- Center for iPS Cell Research and Application, Kyoto University, Kyoto 606-8507, Japan; (S.N.); (K.E.)
| | - Fumihito Arai
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan;
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Chang D, Hirate T, Uehara C, Maruyama H, Uozumi N, Arai F. Evaluating Young's Modulus of Single Yeast Cells Based on Compression Using an Atomic Force Microscope with a Flat Tip. Microsc Microanal 2021; 27:392-399. [PMID: 33446296 DOI: 10.1017/s1431927620024903] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 05/29/2023]
Abstract
In this research, atomic force microscopy (AFM) with a flat tip cantilever is utilized to measure Young's modulus of a whole yeast cell (Saccharomyces cerevisiae BY4741). The results acquired from AFM are similar to those obtained using a microfluidic chip compression system. The mechanical properties of single yeast cells are important parameters which can be examined using AFM. Conventional studies apply AFM with a sharp cantilever tip to indent the cell and measure the force-indentation curve, from which Young's modulus can be calculated. However, sharp tips introduce problems because the shape variation can lead to a different result and cannot represent the stiffness of the whole cell. It can lead to a lack of broader meaning when evaluating Young's modulus of yeast cells. In this report, we confirm the differences in results obtained when measuring the compression of a poly(dimethylsiloxane) bead using a commercial sharp tip versus a unique flat tip. The flat tip effectively avoids tip-derived errors, so we use this method to compress whole yeast cells and generate a force–deformation curve. We believe our proposed method is effective for evaluating Young's modulus of whole yeast cells.
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Affiliation(s)
- Di Chang
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Room 108, Aerospace Mechanical Engineering Research Building, Furo-cho, Chikusa-ku, Nagoya, Aichi464-8603, Japan
| | - Takahiro Hirate
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Room 108, Aerospace Mechanical Engineering Research Building, Furo-cho, Chikusa-ku, Nagoya, Aichi464-8603, Japan
| | - Chihiro Uehara
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aobayama 6-6-07, Sendai980-8579, Japan
| | - Hisataka Maruyama
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Room 108, Aerospace Mechanical Engineering Research Building, Furo-cho, Chikusa-ku, Nagoya, Aichi464-8603, Japan
| | - Nobuyuki Uozumi
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aobayama 6-6-07, Sendai980-8579, Japan
| | - Fumihito Arai
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Room 108, Aerospace Mechanical Engineering Research Building, Furo-cho, Chikusa-ku, Nagoya, Aichi464-8603, Japan
- Department of Mechanical Engineering, The University of Tokyo, Tokyo113-8654, Japan
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Sakai S, Maruyama H, Ieda M. Contribution of peptidyl prolyl isomerase (Pin1) to development of pulmonary hypertension via pulmonary vascular endothelial cell dysfunction. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2233] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Background
Endothelial dysfunction is thought to be a major contributor to overall pathogenesis of vasculopathy seen in pulmonary hypertension (PH), which is manifested by the impaired release of nitric oxide (NO) generated through endothelial nitric oxide synthase (eNOS) in endothelial cells. Activation of human eNOS is regulated by phosphorylation at multiple sites including Thr33 and Ser114, which residues are followed by Pro. The peptidyl isomerase Pin1 specifically isomerizes the phospho-protein having Ser/Thr-Pro bond and regulates their activity. Pin1 is involved in proliferation, cell cycle, and apoptosis in cancer, by isomerizing some functional molecules such as JNK, JUN, cyclin D, BAX, etc. However, it is controversial whether direct interaction of Pin1 with eNOS and how eNOS activity is altered by Pin1, especially in PH.
Purpose
We aimed to clarify whether Pin1 contributes to the PH development using Pin1 knockout mice and Pin1 affects the expression of phosphorylated eNOS (p-eNOS) molecule and pulmonary arterial endothelial cell (PAEC) apoptosis.
Methods and results
Wild (WT) and Pin1-deficient mice (KO) were exposed to hypoxia (10% O2) or normoxia for 3 weeks to generate hypoxia-induced PH. Hypoxia-inducible factor (HIF1α) expression in lungs was significantly enhanced in WT-hypoxia (WH, n=6) and KO-hypoxia (KH, n=6), suggesting that hypoxic response was certainly occurred in these mice. Pulmonary arterial pressure did not elevate in KH compared with KO-normoxia (KN, n=6) and WT-normoxia (WN, n=6), it was significantly increased only in WH (P<0.01), indicating that KO did not develop PH by hypoxia. The gain of RV weight was parallel to the increase of pulmonary arterial pressure. Western blot showed that p-eNOS expression in lungs was significantly decreased in WH compared to WN, however, the expression was not different between KH and KN. It suggests that Pin1 plays a regulatory role in p-eNOS expression in hypoxic response. In cultured PAECs, the expression of p-eNOS and eNOS was markedly increased by siRNA-mediated Pin1 knockdown. Immunoprecipitation study showed the possibility of Pin1 binding to p-eNOS molecule. Apoptosis evaluated by caspase-3/7 activity by fluorescent assay and cleaved caspase-3 expression by Western blot was significantly increased by Pin1 overexpression in PAECs; however, it was significantly decreased by Pin1 knockdown. Moreover, the exaggeration of apoptosis induced by doxorubicin was markedly increased by Pin1 overexpression compared with control in PAECs; however, it was clearly suppressed by Pin1 knockdown.
Conclusion
This study suggests that endogenous Pin1 contributes to the development of PH partly via the dysfunction of PAECs, that is, by the interference with p-eNOS expression and by the increase of apoptosis inducibility to external stimuli.
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): JSPS KAKENHI
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Affiliation(s)
- S Sakai
- University of Tsukuba, Graduate School of Comprehensive Human Sciences, Division of Cardiovascular, Tsukuba, Japan
| | - H Maruyama
- University of Tsukuba, Graduate School of Comprehensive Human Sciences, Division of Cardiovascular, Tsukuba, Japan
| | - M Ieda
- University of Tsukuba, Graduate School of Comprehensive Human Sciences, Division of Cardiovascular, Tsukuba, Japan
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Kurashige T, Morino H, Ueno H, Murao T, Watanabe T, Hinoi T, Nishino I, Maruyama H, Torii T. FSHD / OPMD / MYOTONIC DYSTROPHY. Neuromuscul Disord 2020. [DOI: 10.1016/j.nmd.2020.08.237] [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: 10/23/2022]
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Nishi H, Hosomi N, Ohta K, Aoki S, Nakamori M, Nezu T, Shigeishi H, Shintani T, Obayashi T, Ishikawa K, Kinoshita N, Shiga Y, Sugiyama M, Ohge H, Maruyama H, Kawaguchi H, Kurihara H. Serum immunoglobulin G antibody titer to Fusobacterium nucleatum is associated with unfavorable outcome after stroke. Clin Exp Immunol 2020; 200:302-309. [PMID: 32155293 DOI: 10.1111/cei.13430] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 07/27/2019] [Revised: 03/05/2020] [Accepted: 03/05/2020] [Indexed: 12/21/2022] Open
Abstract
Stroke can be a cause of death, while in non-fatal cases it is a common cause of various disabilities resulting from associated brain damage. However, whether a specific periodontal pathogen is associated with increased risk of unfavorable outcome after stroke remains unknown. We examined risk factors for unfavorable outcome following stroke occurrence, including serum antibody titers to periodontal pathogens. The enrolled cohort included 534 patients who had experienced an acute stroke, who were divided into favorable (n = 337) and unfavorable (n = 197) outcome groups according to modified ranking scale (mRS) score determined at 3 months after onset (favorable = score 0 or 1; unfavorable = score 2-6). The associations of risk factors with unfavorable outcome, including serum titers of IgG antibodies to 16 periodontal pathogens, were examined. Logistic regression analysis showed that the initial National Institutes of Health stroke scale score [odds ratio (OR) = 1·24, 95% confidence interval (CI) = 1·18-1·31, P < 0·001] and C-reactive protein (OR = 1·29, 95% CI = 1·10-1·51, P = 0·002) were independently associated with unfavorable outcome after stroke. Following adjustment with those, detection of the antibody for Fusobacterium nucleatum ATCC 10953 in serum remained an independent predictor of unfavorable outcome (OR = 3·12, 95% CI = 1·55-6·29, P = 0·002). Determination of the antibody titer to F. nucleatum ATCC 10953 in serum may be useful as a predictor of unfavorable outcome after stroke.
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Affiliation(s)
- H Nishi
- Department of General Dentistry, Hiroshima University Hospital, Hiroshima, Japan
| | - N Hosomi
- Department of Neurology, Chikamori Hospital, Kochi, Japan.,Department of Disease Model, Research Institute of Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - K Ohta
- Department of Public Oral Health, Program of Oral Health Sciences, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - S Aoki
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Nakamori
- Department of Neurology, Suiseikai Kajikawa Hospital, Hiroshima, Japan
| | - T Nezu
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Shigeishi
- Department of Public Oral Health, Program of Oral Health Sciences, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - T Shintani
- Center of Oral Examination, Hiroshima University Hospital, Hiroshima, Japan
| | - T Obayashi
- Department of General Dentistry, Hiroshima University Hospital, Hiroshima, Japan
| | - K Ishikawa
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.,Department of Neurology, Suiseikai Kajikawa Hospital, Hiroshima, Japan
| | - N Kinoshita
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Y Shiga
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - M Sugiyama
- Department of Public Oral Health, Program of Oral Health Sciences, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Ohge
- Department of Infectious Diseases, Hiroshima University Hospital, Hiroshima, Japan
| | - H Maruyama
- Department of Clinical Neuroscience and Therapeutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - H Kawaguchi
- Department of General Dentistry, Hiroshima University Hospital, Hiroshima, Japan
| | - H Kurihara
- Department of Periodontal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Maruyama H, Nakamaru T, Oya M, Miyakawa Y, Sato N, Ishizuka Y, Kourakata H, Nakagawa Y, Arakawa M. Posthysteroscopy Candida Glabrata Peritonitis in a Patient on Capd. Perit Dial Int 2020. [DOI: 10.1177/089686089701700421] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- H. Maruyama
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - T. Nakamaru
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - M. Oya
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - Y. Miyakawa
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - N. Sato
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - Y. Ishizuka
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - H. Kourakata
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - Y. Nakagawa
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
| | - M. Arakawa
- Department of Medicine (II) Niigata University School of Medicine 1–754 Asahimachi-Dori Niigata, 951 Japan
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Hashim H, Maruyama H, Akita Y, Arai F. Hydrogel Fluorescence Microsensor with Fluorescence Recovery for Prolonged Stable Temperature Measurements. Sensors (Basel) 2019; 19:s19235247. [PMID: 31795304 PMCID: PMC6928776 DOI: 10.3390/s19235247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 11/23/2019] [Accepted: 11/26/2019] [Indexed: 12/23/2022]
Abstract
This work describes a hydrogel fluorescence microsensor for prolonged stable temperature measurements. Temperature measurement using microsensors has the potential to provide information about cells, tissues, and the culture environment, with optical measurement using a fluorescent dye being a promising microsensing approach. However, it is challenging to achieve stable measurements over prolonged periods with conventional measurement methods based on the fluorescence intensity of fluorescent dye because the excited fluorescent dye molecules are bleached by the exposure to light. The decrease in fluorescence intensity induced by photobleaching causes measurement errors. In this work, a photobleaching compensation method based on the diffusion of fluorescent dye inside a hydrogel microsensor is proposed. The factors that influence compensation in the hydrogel microsensor system are the interval time between measurements, material, concentration of photo initiator, and the composition of the fluorescence microsensor. These factors were evaluated by comparing a polystyrene fluorescence microsensor and a hydrogel fluorescence microsensor, both with diameters of 20 µm. The hydrogel fluorescence microsensor made from 9% poly (ethylene glycol) diacrylate (PEGDA) 575 and 2% photo initiator showed excellent fluorescence intensity stability after exposure (standard deviation of difference from initial fluorescence after 100 measurement repetitions: within 1%). The effect of microsensor size on the stability of the fluorescence intensity was also evaluated. The hydrogel fluorescence microsensors, with sizes greater than the measurement area determined by the axial resolution of the confocal microscope, showed a small decrease in fluorescence intensity, within 3%, after 900 measurement repetitions. The temperature of deionized water in a microchamber was measured for 5400 s using both a thermopile and the hydrogel fluorescence microsensor. The results showed that the maximum error and standard deviation of error between these two sensors were 0.5 °C and 0.3 °C, respectively, confirming the effectiveness of the proposed method.
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Affiliation(s)
- Hairulazwan Hashim
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan; (H.M.); (Y.A.); (F.A.)
- Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Malaysia
- Correspondence: or ; Tel.: +81-52-789-5026; Fax: +81-52-789-5104
| | - Hisataka Maruyama
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan; (H.M.); (Y.A.); (F.A.)
| | - Yusuke Akita
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan; (H.M.); (Y.A.); (F.A.)
| | - Fumihito Arai
- Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan; (H.M.); (Y.A.); (F.A.)
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Shrestha T, Takahashi T, Li C, Matsumoto M, Maruyama H. Upregulation of MIR-132-5P via nicotine enhances cell survival in PC12 cells by targeting the anti-apoptotic protein BCL-2. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1117] [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: 10/25/2022]
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Maruyama H, Sakai S, Ieda M. P6012Active selexipag metabolite MRE-269 increases endothelin receptors in pulmonary artery smooth muscle cells. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0732] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
The pathology of pulmonary arterial hypertension (PAH) indicates the abnormal outgrowth of pulmonary artery smooth muscle cells (PASMCs) of the media. Abundant expression of endothelin 1 (ET-1) is observed in vessels of PAH, and has been considered to play a pathogenic role. There are several endothelin receptors including ETA, ETB. Compared to ETA, ETB mRNA is less expressed in PASMCs from control individuals, and is reported to be increased in those from PAH patients. However, how ETB is involved in PAH remains unclear. Selexipag, a non-prostanoid IP receptor agonist, was recently authorized for treating PAH. Compared to selexipag, the active metabolite MRE-269 has a higher affinity for the IP receptor. Initial combination therapy come to be accepted as a standard strategy for this disease, although the interaction of each drug has not been discussed enough.
Purpose
To assess the effect of selexipag on ET-1 receptors in PASMCs.
Methods
We stimulated purchased human PASMCs and endothelial cells by MRE-269 (300 nM), ET-1 (100 nM) or combination of them in vitro. Quantitative PCR was performed to quantify mRNA expressions. Cell proliferation was assessed by CCK8 cell proliferation assay kit. BQ123, A192621, bosentan was used as blocker against ETA, ETB, or both, respectively.
Results
In PASMCs, MRE-269 increased ETA and ETB expressions 2- and 7-fold, respectively. On the other hand, it increased ETB 1.2-fold in pulmonary artery endothelial cells; ETA was not detected in those cells. After pretreatment by MRE-269, ET-1 accelerated the proliferation of PASMCs. A192621 and bosentan abrogated this proliferation. In contrast, BQ123 did not abrogate it.
Conclusions
In PASMCs, active selexipag metabolite MRE-269 increases ETB more strongly than ETA, resulting in accelerated cell proliferation by ET-1 predominantly via ETB. These data call for further study focused on the choice of ET-1 receptor antagonists in the case of combination therapy with selexipag.
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Affiliation(s)
- H Maruyama
- National Hospital Organization Kasumigaura Medical Center, Tsuchiura, Japan
| | - S Sakai
- University of Tsukuba, Tsukuba, Japan
| | - M Ieda
- University of Tsukuba, Tsukuba, Japan
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14
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Kurashige T, Kanbara T, Sumi N, Tasaka S, Sugiura T, Maruyama H, Torii T. REGISTRIES AND CARE OF NEUROMUSCULAR DISORDERS. Neuromuscul Disord 2018. [DOI: 10.1016/j.nmd.2018.06.339] [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: 11/16/2022]
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15
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Maruyama H, Kimura T, Liu H, Ohtsuki S, Miyake Y, Isogai M, Arai F, Honda A. Influenza virus replication raises the temperature of cells. Virus Res 2018; 257:94-101. [PMID: 30248374 DOI: 10.1016/j.virusres.2018.09.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 09/03/2018] [Accepted: 09/19/2018] [Indexed: 01/08/2023]
Abstract
Influenza virus invades the cell by binding sialic acid on the cell membrane through haemagglutinin (HA), and then genome replication and transcription are carried out in the nucleus to produce progeny virus. Multiplication of influenza virus requires metabolites, such as nucleotides and amino acids, as well as cellular machinery to synthesize its genome and proteins, thereby producing viral particles. Influenza virus infection forces the start of several metabolic systems in the cell, which consume or generate large amounts of energy. Thus, the viral multiplication processes involved in both genome replication and transcription are considered to require large numbers of nucleotides. The high-level consumption of nucleotides generates large amounts of energy, some of which is converted into heat, and this heat may increase the temperature of cells. To address this question, we prepared a tool based on rhodamine B fluorescence, which we used to measure the temperatures of influenza virus-infected and uninfected cells. The results indicated that influenza virus multiplication increased the temperature of cells by approximately 4 °C - 5 °C, ATP levels in the cells decreased at 3 h after infection, and mitochondrial membrane potential decreased with multiplication level. Thus, the increase in cellular temperature during influenza virus infection appears to be due to the massive consumption of ATP over a short period.
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Affiliation(s)
- Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan
| | - Takahiro Kimura
- Department of Frontier Bioscience, Hosei University, Koganei, Tokyo, 184-8584, Japan
| | - Hengiun Liu
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan
| | - Sumio Ohtsuki
- Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto 862-0973, Japan
| | - Yukari Miyake
- Department of Frontier Bioscience, Hosei University, Koganei, Tokyo, 184-8584, Japan
| | - Masashi Isogai
- Technical section, PerkinElmer Japan Co, LTD, Yokohama, Kanagawa, 240-0005, Japan
| | - Fumihito Arai
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Aichi, 464-8603, Japan.
| | - Ayae Honda
- Department of Frontier Bioscience, Hosei University, Koganei, Tokyo, 184-8584, Japan; Research Center of Phamacy, Nihon University, Narashino-dai, Chiba, 274-0005, Japan.
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16
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Honda J, Kimura T, Sakai S, Maruyama H, Homma S, Miyauchi T, Aonuma K. P244The glucagon-like peptide-1 receptor agonist liraglutide ameriolates hypoxia-induced pulmonary hypertension in mice partly via recovery of ETB receptor expression. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J Honda
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - T Kimura
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - S Sakai
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - H Maruyama
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - S Homma
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - T Miyauchi
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
| | - K Aonuma
- Tsukuba University, Department of Cardiology, Faculty of Medicine, Tsukuba, Japan
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17
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Maruyama H, Sakai S, Aonuma K. P3561Active selexipag-metabolite MRE-269 induces DUSP1 and inhibits PASMC proliferation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- H Maruyama
- Moriya Daiichi General Hospital, Department of Cardiovascular Medicine, Moriya, Japan
| | - S Sakai
- University of Tsukuba, Tsukuba, Japan
| | - K Aonuma
- University of Tsukuba, Tsukuba, Japan
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18
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Hayakawa T, Maruyama H, Watanabe T, Arai F. Three-Dimensional Blood Vessel Model with Temperature-Indicating Function for Evaluation of Thermal Damage during Surgery. Sensors (Basel) 2018; 18:s18020345. [PMID: 29370139 PMCID: PMC5855279 DOI: 10.3390/s18020345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 01/20/2018] [Accepted: 01/23/2018] [Indexed: 01/28/2023]
Abstract
Surgical simulators have recently attracted attention because they enable the evaluation of the surgical skills of medical doctors and the performance of medical devices. However, thermal damage to the human body during surgery is difficult to evaluate using conventional surgical simulators. In this study, we propose a functional surgical model with a temperature-indicating function for the evaluation of thermal damage during surgery. The simulator is made of a composite material of polydimethylsiloxane and a thermochromic dye, which produces an irreversible color change as the temperature increases. Using this material, we fabricated a three-dimensional blood vessel model using the lost-wax process. We succeeded in fabricating a renal vessel model for simulation of catheter ablation. Increases in the temperature of the materials can be measured by image analysis of their color change. The maximum measurement error of the temperature was approximately -1.6 °C/+2.4 °C within the range of 60 °C to 100 °C.
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Affiliation(s)
- Takeshi Hayakawa
- Room 310, Aerospace Mechanical Engineering Research Building 3F, Department of Micro-Nano Mechanical Science & Engineering, Nagoya University, Furo-cho, Chikusa-ku, Aichi-Pref., Nagoya-shi 464-8603, Japan.
| | - Hisataka Maruyama
- Room 310, Aerospace Mechanical Engineering Research Building 3F, Department of Micro-Nano Mechanical Science & Engineering, Nagoya University, Furo-cho, Chikusa-ku, Aichi-Pref., Nagoya-shi 464-8603, Japan.
| | - Takafumi Watanabe
- Room 310, Aerospace Mechanical Engineering Research Building 3F, Department of Micro-Nano Mechanical Science & Engineering, Nagoya University, Furo-cho, Chikusa-ku, Aichi-Pref., Nagoya-shi 464-8603, Japan.
| | - Fumihito Arai
- Room 310, Aerospace Mechanical Engineering Research Building 3F, Department of Micro-Nano Mechanical Science & Engineering, Nagoya University, Furo-cho, Chikusa-ku, Aichi-Pref., Nagoya-shi 464-8603, Japan.
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Nakamori M, Imamura E, Matsushima H, Maetani Y, Kushitani S, Wakabayashi S, Yoshikawa M, Tsuga K, Nagasaki T, Hosomi N, Maruyama H. Investigation of the relationship between videofluoroscopic examination and tongue pressure using a balloon-type device in acute stroke patients. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1774] [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: 10/18/2022]
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20
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Kurashige T, Sumi N, Kanbara T, Ohta M, Sugiura T, Maruyama H, Torii T. Anti-HMGCR antibody positive myopathy shows bcl-2-positive lymphocyte follicles. Neuromuscul Disord 2017. [DOI: 10.1016/j.nmd.2017.06.236] [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: 11/27/2022]
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21
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Shrestha T, Takahashi T, Honjo K, Maruyama H. Dyke-Davidoff-Masson syndrome: A rare complication of DPT vaccination. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2612] [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: 10/18/2022]
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22
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Nomura E, Ohshita T, Naka H, Matsushima H, Kubo S, Takeshima S, Imamura E, Torii T, Hosomi N, Maruyama H, Matsumoto M. Stroke recurrence or death during 2 weeks after acute ischemic stroke with atrial fibrillation - multicenter prospective registry in Hiroshima –. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1789] [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: 10/18/2022]
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23
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Morino H, Ohsawa R, Miyamoto R, Izumi Y, Maruyama H, Kawakami H. Identification rate of hereditary neurodegenerative disease by next-generation sequencing. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3503] [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: 10/18/2022]
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24
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Sugimoto T, Ochi K, Kohriyama T, Hayashi M, Tachiyama K, Ishibashi H, Fujii H, Kurokawa K, Yamawaki T, Matsumoto M, Maruyama H. Long term course and malignancy as a prognostic factor of chronic inflammatory demyelinating polyneuropathy. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3038] [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: 10/18/2022]
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25
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Abe T, Maruyama H, Deguchi I, Mihara B, Tanahashi N, Takao M. Investigation of cerebral microbleeds in cases of ischemic stroke/hemorrhagic stroke using only 3.0T MRI data. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3314] [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: 11/15/2022]
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26
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Neshige S, Matsuhashi M, Sakurai T, Kobayashi K, Shimotake A, Kikuchi T, Yoshida K, Kunieda T, Matsumoto R, Maruyama H, Takahashi R, Ikeda A. Efficacy of wide-band electrocorticography on mapping of the primary seonsory-motor area compared with electrical cortical stimulation. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.291] [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: 11/26/2022]
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27
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Nezu T, Naka H, Hosomi N, Takamatsu K, Nomura E, Kitamura T, Torii T, Ohshita T, Imamura E, Nakamori M, Shimomura R, Aoki S, Maruyama H, Matsumoto M. Microbleeds evaluation study for prevention of brain hemorrhage in ischemic stroke (MB-evidence): Pilot analysis for multicenter longitudinal study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1783] [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: 10/18/2022]
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28
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Maruyama H, Sakai S, Aonuma K. P725BMP2 induces DUSP1 in pulmonary artery smooth muscle cells. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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29
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Maruyama H, Sakai S, Aonuma K. P728Endothelin-1 modifies BMP signaling pathway to induce cyclin D1 in pulmonary artery smooth muscle cells. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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30
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Masuda T, Maruyama H, Arai F, Anada T, Tsuchiya K, Fukuda T, Suzuki O. Application of an indicator-immobilized-gel-sheet for measuring the pH surrounding a calcium phosphate-based biomaterial. J Biomater Appl 2017; 31:1296-1304. [DOI: 10.1177/0885328217699108] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The present study was designed to investigate the local microenvironment of octacalcium phosphate in a granule form upon biomolecules adsorption utilizing an indicator-immobilized-gel-sheet for measuring pH. We previously showed that octacalcium phosphate enhances bone regeneration during its progressive hydrolysis into hydroxyapatite if implanted in bone defects. The gel-sheet was made from a photocrosslinkable prepolymer solution, which can easily immobilize a pH indicator (bromothymol blue; BTB) in the hydrogel. The indicator-immobilized-gel-sheet was mounted on a biochip which was made of polydimethylsiloxane (PDMS) with a flow channel. The pH value was calculated by detecting the color changes in the gel-sheet and displayed as the pH distribution. After pre-adsorption of bovine albumin, β-lactoglobuline or cytochrome C onto octacalcium phosphate granules, the granules with the gel-sheet were further incubated in Tris-HCl buffer solution in the absence or presence of fluoride, known as an accelerator of octacalcium phosphate hydrolysis. pH values of the gel-sheet surrounding octacalcium phosphate granules showed a decrease from pH 7.4 to 6.6 in relation to the proteins adsorbed. Overall, the proposed pH-sensitive gel can be used to detect the pH around octacalcium phosphate granules with a high spatial resolution.
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Affiliation(s)
- Taisuke Masuda
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | | | - Fumihito Arai
- Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Takahisa Anada
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
| | - Kaori Tsuchiya
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
| | - Toshio Fukuda
- Faculty of Science and Technology, Meijo University, Nagoya, Japan
| | - Osamu Suzuki
- Graduate School of Dentistry, Tohoku University, Aoba-ku Sendai, Japan
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31
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Lu C, Nakajima N, Maruyama H. Observation of the flexoelectricity of a SrTiO 3 single crystal by x-ray absorption and emission spectroscopies. J Phys Condens Matter 2017; 29:045702. [PMID: 27882902 DOI: 10.1088/1361-648x/29/4/045702] [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] [Indexed: 06/06/2023]
Abstract
Flexoelectricity, defined as the spontaneous electric polarization in a dielectric material induced by a strain gradient, is investigated from the microscopic viewpoint by x-ray spectroscopy. A single crystal SrTiO3 sample was used as a test system in order to reveal the appearance of the electric dipole moment by simple bending of the crystal. The spectral change characteristic of ferroelectric transition in SrTiO3 was not observed in the Ti K-edge absorption spectra. Instead, the gradual decrease (increase) of the post-edge feature (pre-edge structure) by bending was qualitatively explained using theoretical calculations that assumed the presence of oxygen vacancies and a slight crystal distortion. This assumption is also supported by the broadening of a tiny charge-transfer peak in the Ti Kβ resonant emission spectra. Therefore, it was revealed that the flexoelectric effect in SrTiO3 is easily drowned out through local imperfection induced by crystal deformations and cracks.
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Affiliation(s)
- C Lu
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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32
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Hashim H, Maruyama H, Masuda T, Arai F. Manipulation and Immobilization of a Single Fluorescence Nanosensor for Selective Injection into Cells. Sensors (Basel) 2016; 16:s16122041. [PMID: 27916931 PMCID: PMC5191022 DOI: 10.3390/s16122041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Revised: 11/21/2016] [Accepted: 11/29/2016] [Indexed: 12/15/2022]
Abstract
Manipulation and injection of single nanosensors with high cell viability is an emerging field in cell analysis. We propose a new method using fluorescence nanosensors with a glass nanoprobe and optical control of the zeta potential. The nanosensor is fabricated by encapsulating a fluorescence polystyrene nanobead into a lipid layer with 1,3,3-trimethylindolino-6'-nitrobenzopyrylospiran (SP), which is a photochromic material. The nanobead contains iron oxide nanoparticles and a temperature-sensitive fluorescent dye, Rhodamine B. The zeta potential of the nanosensor switches between negative and positive by photo-isomerization of SP with ultraviolet irradiation. The positively-charged nanosensor easily adheres to a negatively-charged glass nanoprobe, is transported to a target cell, and then adheres to the negatively-charged cell membrane. The nanosensor is then injected into the cytoplasm by heating with a near-infrared (NIR) laser. As a demonstration, a single 750 nm nanosensor was picked-up using a glass nanoprobe with optical control of the zeta potential. Then, the nanosensor was transported and immobilized onto a target cell membrane. Finally, it was injected into the cytoplasm using a NIR laser. The success rates of pick-up and cell immobilization of the nanosensor were 75% and 64%, respectively. Cell injection and cell survival rates were 80% and 100%, respectively.
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Affiliation(s)
- Hairulazwan Hashim
- Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.
- Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia.
| | - Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.
| | - Taisuke Masuda
- Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.
| | - Fumihito Arai
- Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan.
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33
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Kurashige T, Morino H, Kanbara T, Nagano Y, Araki M, Maruyama H, Torii T, Matsumoto M. TBK1 exists with optineurin around rimmed vacuoles. Neuromuscul Disord 2016. [DOI: 10.1016/j.nmd.2016.06.318] [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: 11/26/2022]
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34
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Liu H, Maruyama H, Masuda T, Honda A, Arai F. The Influence of Virus Infection on the Extracellular pH of the Host Cell Detected on Cell Membrane. Front Microbiol 2016; 7:1127. [PMID: 27582727 PMCID: PMC4987339 DOI: 10.3389/fmicb.2016.01127] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 07/06/2016] [Indexed: 01/08/2023] Open
Abstract
Influenza virus infection can result in changes in the cellular ion levels at 2-3 h post-infection. More H(+) is produced by glycolysis, and the viral M2 proton channel also plays a role in the capture and release of H(+) during both viral entry and egress. Then the cells might regulate the intracellular pH by increasing the export of H(+) from the intracellular compartment. Increased H(+) export could lead indirectly to increased extracellular acidity. To detect changes in extracellular pH of both virus-infected and uninfected cells, pH sensors were synthesized using polystyrene beads (ϕ1 μm) containing Rhodamine B and Fluorescein isothiocyanate (FITC). The fluorescence intensity of FITC can respond to both pH and temperature. So Rhodamine B was also introduced in the sensor for temperature compensation. Then the pH can be measured after temperature compensation. The sensor was adhered to cell membrane for extracellular pH measurement. The results showed that the multiplication of influenza virus in host cell decreased extracellular pH of the host cell by 0.5-0.6 in 4 h after the virus bound to the cell membrane, compared to that in uninfected cells. Immunostaining revealed the presence of viral PB1 protein in the nucleus of virus-bound cells that exhibited extracellular pH changes, but no PB1 protein are detected in virus-unbound cells where the extracellular pH remained constant.
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Affiliation(s)
- Hengjun Liu
- Department of Micro-Nano Systems Engineering, Nagoya University Nagoya, Japan
| | - Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Nagoya University Nagoya, Japan
| | - Taisuke Masuda
- Department of Micro-Nano Systems Engineering, Nagoya University Nagoya, Japan
| | - Ayae Honda
- Department of Frontier Bioscience, Hosei University Tokyo, Japan
| | - Fumihito Arai
- Department of Micro-Nano Systems Engineering, Nagoya University Nagoya, Japan
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35
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Nishikawa T, Takahashi T, Nakamori M, Hosomi N, Maruyama H, Miyazaki Y, Izumi Y, Matsumoto M. The identification of raft-derived tau-associated vesicles that are incorporated into immature tangles and paired helical filaments. Neuropathol Appl Neurobiol 2015; 42:639-653. [PMID: 26501932 DOI: 10.1111/nan.12288] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 04/28/2015] [Revised: 10/07/2015] [Accepted: 10/26/2015] [Indexed: 12/14/2022]
Abstract
AIMS Neurofibrillary tangles (NFTs), a cardinal pathological feature of neurodegenerative disorders, such as Alzheimer's disease (AD) are primarily composed of hyper-phosphorylated tau protein. Recently, several other molecules, including flotillin-1, phosphatidylinositol-4,5-bisphosphate [PtdIns(4,5)P2] and cyclin-dependent kinase 5 (CDK5), have also been revealed as constituents of NFTs. Flotillin-1 and PtdIns(4,5)P2 are considered markers of raft microdomains, whereas CDK5 is a tau kinase. Therefore, we hypothesized that NFTs have a relationship with raft domains and the tau phosphorylation that occurs within NFTs. METHODS We investigated six cases of AD, six cases of other neurodegenerative diseases with NFTs and three control cases. We analysed the PtdIns(4,5)P2-immunopositive material in detail, using super-resolution microscopy and electron microscopy to elucidate its pattern of expression. We also investigated the spatial relationship between the PtdIns(4,5)P2-immunopositive material and tau kinases through double immunofluorescence analysis. RESULTS Pretangles contained either paired helical filaments (PHFs) or PtdIns(4,5)P2-immunopositive small vesicles (approximately 1 μm in diameter) with nearly identical topology to granulovacuolar degeneration (GVD) bodies. Various combinations of these vesicles and GVD bodies, the latter of which are pathological hallmarks observed within the neurons of AD patients, were found concurrently in neurons. These vesicles and GVD bodies were both immunopositive not only for PtdIns(4,5)P2, but also for several tau kinases such as glycogen synthase kinase-3β and spleen tyrosine kinase. CONCLUSIONS These observations suggest that clusters of raft-derived vesicles that resemble GVD bodies are substructures of pretangles other than PHFs. These tau kinase-bearing vesicles are likely involved in the modification of tau protein and in NFT formation.
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Affiliation(s)
- T Nishikawa
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - T Takahashi
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - M Nakamori
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - N Hosomi
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - H Maruyama
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Y Miyazaki
- Department of Clinical Neuroscience, Institute of Health Biosciences, Graduate School of Medicine, University of Tokushima, Tokushima, Japan
| | - Y Izumi
- Department of Clinical Neuroscience, Institute of Health Biosciences, Graduate School of Medicine, University of Tokushima, Tokushima, Japan
| | - M Matsumoto
- Department of Clinical Neuroscience and Therapeutics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
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Kurashige T, Morino H, Nagano Y, Maruyama H, Matsumoto M. Rimmed vacuoles are positive for RIPK1 and RIPK3. Neuromuscul Disord 2015. [DOI: 10.1016/j.nmd.2015.06.194] [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: 10/23/2022]
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Nagata K, Maruyama H, Mizuhashi R, Morita S, Hori S, Yokoe T, Sugawara Y. Efficacy of stabilisation splint therapy combined with non-splint multimodal therapy for treating RDC/TMD axis I patients: a randomised controlled trial. J Oral Rehabil 2015; 42:890-9. [PMID: 26174571 DOI: 10.1111/joor.12332] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2015] [Indexed: 11/29/2022]
Abstract
Stabilisation splint therapy has long been thought to be effective for the management of temporomandibular disorders (TMD). However, the superiority of stabilisation splint therapy compared to other TMD treatments remains controversial. The aim of this study was to determine the efficacy of stabilisation splint therapy combined with non-splint multimodal therapy for TMD. A total of 181 TMD participants were randomly allocated to a non-splint multimodal therapy (NS) group (n = 85) or a non-splint multimodal therapy plus stabilisation splint (NS+S) group (n = 96). Non-splint multimodal therapy included self-exercise of the jaw, cognitive-behavioural therapy, self-management education and additional jaw manipulation. Three outcome measurements were used to assess treatment efficacy: mouth-opening limitation, oro-facial pain and temporomandibular joint sounds. A two-factor repeated-measures analysis of variance (anova) was used to evaluate the efficacy of the two treatment modalities (NS vs. NS+S), and Scheffe's multiple comparison test was used to compare the treatment periods. Subgroup analyses were performed to disclose the splint effects for each TMD diagnostic group. All three parameters significantly decreased over time in both groups. However, there were no significant differences between the two treatment groups in the total comparison or subgroup analyses; an exception was the group with degenerative joint disease. No significant difference between the NS and NS+S treatment approaches was revealed in this study. Therefore, we conclude that the additional effects of stabilisation splint are not supported for patients with TMD during the application of multimodal therapy.
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Affiliation(s)
- K Nagata
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - H Maruyama
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - R Mizuhashi
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - S Morita
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - S Hori
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - T Yokoe
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
| | - Y Sugawara
- Temporomandibular Disorders and Bruxism Clinic, Niigata Hospital, The Nippon Dental University, Niigata, Japan
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Homma N, Gejyo F, Hasegawa S, Teramura T, Ei I, Maruyama H, Arakawa M. Effects of a new adsorbent column for removing beta-2-microglobulin from circulating blood of dialysis patients. Contrib Nephrol 2015; 112:164-71. [PMID: 7554988 DOI: 10.1159/000424105] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- N Homma
- Department of Medicine (II), Niigata University School of Medicine, Japan
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Gejyo F, Homma N, Maruyama H, Arakawa M. Beta 2-microglobulin-related amyloidosis in patients receiving chronic hemodialysis. Contrib Nephrol 2015; 68:263-9. [PMID: 3069321 DOI: 10.1159/000416524] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- F Gejyo
- Department of Medicine (II), Niigata University School of Medicine, Japan
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40
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Furuna T, Nagasaki H, Nishizawa S, Sugiura M, Okuzumi H, Ito H, Kinugasa T, Hashizume K, Maruyama H. Longitudinal change in the physical performance of older adults in the community. J Jpn Phys Ther Assoc 2015; 1:1-5. [PMID: 25792874 DOI: 10.1298/jjpta.1.1] [Citation(s) in RCA: 45] [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] [Subscribe] [Scholar Register] [Received: 08/29/1997] [Accepted: 02/07/1998] [Indexed: 01/26/2023]
Abstract
The primary purposes of this study were 1) to confirm age-related deterioration of physical performance in older adults longitudinally, and 2) to predict future functional status and mortality by initial level of physical performances. The subjects were 517 older adults examined both in 1992 and 1996 in the Tokyo Metropolitan Institute of Gerontology, Longitudinal Interdisciplinary Study on Aging. The same battery consisting of muscle strength, balance, walking, and manual speed was administered to the subjects in the baseline and follow-up examinations. A significant longitudinal decline was observed in all physical performances except for grip strength. The age-related decline accelerated with aging for preferred walking velocity. Inter-subject variability in walking velocity significantly increased for 4 years period. Maximum walking velocity was a common predictor for functional status and mortality. The results suggest that physical performance measures, especially maximum walking velocity, is a valid means for physical therapy to evaluate physical functioning of community-living older persons.
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Affiliation(s)
- T Furuna
- Department of Kinesiology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
| | - H Nagasaki
- Department of Kinesiology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
| | - S Nishizawa
- Department of Kinesiology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
| | - M Sugiura
- Department of Kinesiology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
| | - H Okuzumi
- The Research Institute for the Education of Exceptional Children, Tokyo Gakugei University, Tokyo 184-0015, Japan
| | - H Ito
- Department of Physical Therapy, Ibaraki Prefectural University of Health Science, Ibaraki 300-0301, Japan
| | - T Kinugasa
- College of Medical Technology and Nursing, University of Tsukuba, Ibaraki 305-0006, Japan
| | - K Hashizume
- Faculty of Health and Sports Sciences, Osaka University, Osaka 560-0006, Japan
| | - H Maruyama
- Department of Physical Therapy, International University of Medicine and Welfare, Tochigi 324-0011, Japan
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Poulsen CS, Skov S, Yoshida A, Skallerup P, Maruyama H, Thamsborg SM, Nejsum P. Differential serodiagnostics ofToxocara canisandToxocara cati- is it possible? Parasite Immunol 2015; 37:204-7. [DOI: 10.1111/pim.12181] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 02/17/2015] [Indexed: 11/29/2022]
Affiliation(s)
- C. S. Poulsen
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - S. Skov
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - A. Yoshida
- Division of Parasitology; Faculty of Medicine; University of Miyazaki; Miyazaki Japan
| | - P. Skallerup
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - H. Maruyama
- Division of Parasitology; Faculty of Medicine; University of Miyazaki; Miyazaki Japan
| | - S. M. Thamsborg
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - P. Nejsum
- Department of Veterinary Disease Biology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
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Tanaka R, Fujisawa Y, Maruyama H, Nakamura Y, Yoshino K, Ohtsuka M, Fujimoto M. Case series of thyroid dysfunction induced by nivolumab (anti-PD-1; ONO-4538). Ann Oncol 2015. [DOI: 10.1093/annonc/mdv097.8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Daidoji T, Watanabe Y, Ibrahim MS, Yasugi M, Maruyama H, Masuda T, Arai F, Ohba T, Honda A, Ikuta K, Nakaya T. Avian Influenza Virus Infection of Immortalized Human Respiratory Epithelial Cells Depends upon a Delicate Balance between Hemagglutinin Acid Stability and Endosomal pH. J Biol Chem 2015; 290:10627-42. [PMID: 25673693 DOI: 10.1074/jbc.m114.611327] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 09/17/2014] [Indexed: 12/13/2022] Open
Abstract
The highly pathogenic avian influenza (AI) virus, H5N1, is a serious threat to public health worldwide. Both the currently circulating H5N1 and previously circulating AI viruses recognize avian-type receptors; however, only the H5N1 is highly infectious and virulent in humans. The mechanism(s) underlying this difference in infectivity remains unclear. The aim of this study was to clarify the mechanisms responsible for the difference in infectivity between the current and previously circulating strains. Primary human small airway epithelial cells (SAECs) were transformed with the SV40 large T-antigen to establish a series of clones (SAEC-Ts). These clones were then used to test the infectivity of AI strains. Human SAEC-Ts could be broadly categorized into two different types based on their susceptibility (high or low) to the viruses. SAEC-T clones were poorly susceptible to previously circulating AI but were completely susceptible to the currently circulating H5N1. The hemagglutinin (HA) of the current H5N1 virus showed greater membrane fusion activity at higher pH levels than that of previous AI viruses, resulting in broader cell tropism. Moreover, the endosomal pH was lower in high susceptibility SAEC-T clones than that in low susceptibility SAEC-T clones. Taken together, the results of this study suggest that the infectivity of AI viruses, including H5N1, depends upon a delicate balance between the acid sensitivity of the viral HA and the pH within the endosomes of the target cell. Thus, one of the mechanisms underlying H5N1 pathogenesis in humans relies on its ability to fuse efficiently with the endosomes in human airway epithelial cells.
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Affiliation(s)
- Tomo Daidoji
- From the Department of Infectious Diseases, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Yohei Watanabe
- the Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Madiha S Ibrahim
- the Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan, the Department of Microbiology, Faculty of Veterinary Medicine, Damanhour University, Damanhour 22111, Egypt
| | - Mayo Yasugi
- the Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan, the Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, 598-8531, Japan
| | - Hisataka Maruyama
- the Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan, and
| | - Taisuke Masuda
- the Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan, and
| | - Fumihito Arai
- the Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan, and
| | - Tomoyuki Ohba
- the Department of Frontier Bioscience, Hosei University, Koganei, Tokyo 184-8584, Japan
| | - Ayae Honda
- the Department of Frontier Bioscience, Hosei University, Koganei, Tokyo 184-8584, Japan
| | - Kazuyoshi Ikuta
- the Department of Virology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takaaki Nakaya
- From the Department of Infectious Diseases, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan,
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Sato MK, Toda M, Inomata N, Maruyama H, Okamatsu-Ogura Y, Arai F, Ono T, Ishijima A, Inoue Y. Temperature changes in brown adipocytes detected with a bimaterial microcantilever. Biophys J 2015; 106:2458-64. [PMID: 24896125 DOI: 10.1016/j.bpj.2014.04.044] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 04/15/2014] [Accepted: 04/28/2014] [Indexed: 10/25/2022] Open
Abstract
Mammalian cells must produce heat to maintain body temperature and support other biological activities. Methods to measure a cell's thermogenic ability by inserting a thermometer into the cell or measuring the rate of oxygen consumption in a closed vessel can disturb its natural state. Here, we developed a noninvasive system for measuring a cell's heat production with a bimaterial microcantilever. This method is suitable for investigating the heat-generating properties of cells in their native state, because changes in cell temperature can be measured from the bending of the microcantilever, without damaging the cell and restricting its supply of dissolved oxygen. Thus, we were able to measure increases in cell temperature of <1 K in a small number of murine brown adipocytes (n = 4-7 cells) stimulated with norepinephrine, and observed a slow increase in temperature over several hours. This long-term heat production suggests that, in addition to converting fatty acids into heat energy, brown adipocytes may also adjust protein expression to raise their own temperature, to generate more heat. We expect this bimaterial microcantilever system to prove useful for determining a cell's state by measuring thermal characteristics.
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Affiliation(s)
- Masaaki K Sato
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Masaya Toda
- Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Naoki Inomata
- Micro System Integration Center, Tohoku University, Sendai, Japan
| | - Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Japan
| | - Yuko Okamatsu-Ogura
- Department of Biomedical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Fumihito Arai
- Department of Micro-Nano Systems Engineering, Nagoya University, Nagoya, Japan
| | - Takahito Ono
- Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Akihiko Ishijima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Yuichi Inoue
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
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Masuda T, Maruyama H, Honda A, Arai F. Virus enrichment for single virus infection by using 3D insulator based dielectrophoresis. PLoS One 2014; 9:e94083. [PMID: 24918921 PMCID: PMC4053322 DOI: 10.1371/journal.pone.0094083] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [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: 12/11/2013] [Accepted: 03/10/2014] [Indexed: 01/08/2023] Open
Abstract
We developed an active virus filter (AVF) that enables virus enrichment for single virus infection, by using insulator-based dielectrophoresis (iDEP). A 3D-constricted flow channel design enabled the production of an iDEP force in the microfluidic chip. iDEP using a chip with multiple active virus filters (AVFs) was more accurate and faster than using a chip with a single AVF, and improved the efficiency of virus trapping. We utilized maskless photolithography to achieve the precise 3D gray-scale exposure required for fabrication of constricted flow channel. Influenza virus (A PR/8) was enriched by a negative DEP force when sinusoidal wave was applied to the electrodes within an amplitude range of 20 Vp-p and a frequency of 10 MHz. AVF-mediated virus enrichment can be repeated simply by turning the current ON or OFF. Furthermore, the negative AVF can inhibit virus adhesion onto the glass substrate. We then trapped and transported one of the enriched viruses by using optical tweezers. This microfluidic chip facilitated the effective transport of a single virus from AVFs towards the cell-containing chamber without crossing an electrode. We successfully transported the virus to the cell chamber (v = 10 µm/s) and brought it infected with a selected single H292 cell.
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Affiliation(s)
- Taisuke Masuda
- Department of Micro-Nano Systems Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan
- * E-mail:
| | - Hisataka Maruyama
- Department of Micro-Nano Systems Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Ayae Honda
- Department of Frontier Bioscience, Hosei University, Koganei, Tokyo, Japan
| | - Fumihito Arai
- Department of Micro-Nano Systems Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Japan
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Maruyama H, Kamezaki H, Kondo T, Sekimoto T, Takahashi M, Yokosuka O. Sonographic and clinical features of collateral vessels at the splenic hilum in cirrhosis. Clin Radiol 2014; 69:e140-5. [DOI: 10.1016/j.crad.2013.11.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 10/31/2013] [Accepted: 11/04/2013] [Indexed: 01/29/2023]
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Kotsugi M, Maruyama H, Ishimatsu N, Kawamura N, Suzuki M, Mizumaki M, Osaka K, Matsumoto T, Ohkochi T, Ohtsuki T. Structural, magnetic and electronic state characterization of L1 0-type ordered FeNi alloy extracted from a natural meteorite. J Phys Condens Matter 2014; 26:064206. [PMID: 24469025 DOI: 10.1088/0953-8984/26/6/064206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
To understand the hard magnetism of L10-type ordered FeNi alloy, we extracted the L10-FeNi phase from a natural meteorite, and evaluated its fundamental solid-state properties: sample composition, magnetic hysteresis, crystal structure and electronic structure. We executed multidirectional analyses using scanning electron microscopy with an electron probe micro-analyzer (SEM-EPMA), a superconducting quantum interference device (SQUID), x-ray diffraction (XRD) and magnetic circular dichroism (MCD). As a result, we found that the composition was Fe: 50.47 ± 1.98 at.%, Ni: 49.60 ± 1.49 at.%, and an obvious superlattice peak is confirmed. The estimated degree of order was 0.608, with lattice constants a = b = 3.582 Å and c = 3.607 Å. The obtained coercivity was more than 500 Oe. MCD analysis using the K absorption edge suggests that the magnetic anisotropy could originate from the orbital magnetic moment of 3d electrons in Fe; this result is consistent with that in a previous report obtained with synthetic L10-FeNi.
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Homma T, Nagaoka U, Kawata A, Mochizuki Y, Kawakami H, Maruyama H, Matsubara S, Komori T. Neuropathological features of Japanese familial amyotrophic lateral sclerosis with p.N352S mutation inTARDBP. Neuropathol Appl Neurobiol 2014; 40:231-6. [DOI: 10.1111/nan.12090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 10/02/2013] [Indexed: 12/13/2022]
Affiliation(s)
- T. Homma
- Department of Laboratory Medicine and Pathology (Neuropathology); Tokyo Metropolitan Neurological Hospital; Tokyo Japan
- Department of Pathology; Saitama Medical University; Saitama Japan
| | - U. Nagaoka
- Department of Neurology; Tokyo Metropolitan Neurological Hospital; Tokyo Japan
| | - A. Kawata
- Department of Neurology; Tokyo Metropolitan Neurological Hospital; Tokyo Japan
| | - Y. Mochizuki
- Department of Laboratory Medicine and Pathology (Neuropathology); Tokyo Metropolitan Neurological Hospital; Tokyo Japan
- Department of Neurology; Tokyo Metropolitan Kita Medical and Rehabilitation Center for the Disabled; Tokyo Japan
| | - H. Kawakami
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine; Hiroshima University; Hiroshima Japan
| | - H. Maruyama
- Department of Epidemiology, Research Institute for Radiation Biology and Medicine; Hiroshima University; Hiroshima Japan
| | - S. Matsubara
- Department of Neurology; Tokyo Metropolitan Neurological Hospital; Tokyo Japan
| | - T. Komori
- Department of Laboratory Medicine and Pathology (Neuropathology); Tokyo Metropolitan Neurological Hospital; Tokyo Japan
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Homma T, Nagaoka U, Kawata A, Mochizuki Y, Kawakami H, Maruyama H, Matsubara S, Komori T. Authors' reply to Drs M van Blitterswijk, R Rademakers and LH van den Berg. Neuropathol Appl Neurobiol 2013; 40:359-60. [PMID: 24304300 DOI: 10.1111/nan.12105] [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: 11/22/2013] [Accepted: 12/02/2013] [Indexed: 11/28/2022]
Affiliation(s)
- T Homma
- Department of Laboratory Medicine and Pathology (Neuropathology), Tokyo Metropolitan Neurological Hospital, Tokyo, Japan; Department of Pathology, Saitama Medical University, Saitama, Japan
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Kurosawa M, Shimoju R, Uenishi-Sadakiyo K, Maruyama H. Reflex responses of arterial pressure to electrical stimulation of the muscle are enhanced in the ovariectomized rats. Auton Neurosci 2013. [DOI: 10.1016/j.autneu.2013.08.037] [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: 10/26/2022]
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