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Abe S, Asami S, Eizuka M, Futagi S, Gando A, Gando Y, Gima T, Goto A, Hachiya T, Hata K, Hayashida S, Hosokawa K, Ichimura K, Ieki S, Ikeda H, Inoue K, Ishidoshiro K, Kamei Y, Kawada N, Kishimoto Y, Koga M, Kurasawa M, Maemura N, Mitsui T, Miyake H, Nakahata T, Nakamura K, Nakamura K, Nakamura R, Ozaki H, Sakai T, Sambonsugi H, Shimizu I, Shirai J, Shiraishi K, Suzuki A, Suzuki Y, Takeuchi A, Tamae K, Ueshima K, Watanabe H, Yoshida Y, Obara S, Ichikawa AK, Chernyak D, Kozlov A, Nakamura KZ, Yoshida S, Takemoto Y, Umehara S, Fushimi K, Kotera K, Urano Y, Berger BE, Fujikawa BK, Learned JG, Maricic J, Axani SN, Smolsky J, Fu Z, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Dell'Oro S, O'Donnell T, Detwiler JA, Enomoto S, Decowski MP, Grant C, Li A, Song H. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen. Phys Rev Lett 2023; 130:051801. [PMID: 36800472 DOI: 10.1103/physrevlett.130.051801] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 04/10/2022] [Accepted: 11/29/2022] [Indexed: 06/18/2023]
Abstract
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of ^{136}Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the 0νββ decay half-life of T_{1/2}^{0ν}>2.3×10^{26} yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations.
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Affiliation(s)
- S Abe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Asami
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - M Eizuka
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Futagi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Gima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Goto
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Hachiya
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Hata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Hayashida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Hosokawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ichimura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Ieki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ikeda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Inoue
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Ishidoshiro
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Kamei
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - N Kawada
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Kishimoto
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - M Koga
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - M Kurasawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - N Maemura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Mitsui
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Miyake
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Nakahata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - R Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ozaki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Graduate Program on Physics for the Universe, Tohoku University, Sendai 980-8578, Japan
| | - T Sakai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Sambonsugi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - I Shimizu
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - J Shirai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Shiraishi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Takeuchi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Tamae
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ueshima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Watanabe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Yoshida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Obara
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
| | - A K Ichikawa
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | - D Chernyak
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - A Kozlov
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Z Nakamura
- Kyoto University, Department of Physics, Kyoto 606-8502, Japan
| | - S Yoshida
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Takemoto
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Umehara
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - K Fushimi
- Department of Physics, Tokushima University, Tokushima 770-8506, Japan
| | - K Kotera
- Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - Y Urano
- Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - B E Berger
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B K Fujikawa
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J G Learned
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - J Maricic
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - S N Axani
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - J Smolsky
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Z Fu
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - L A Winslow
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Y Efremenko
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - H J Karwowski
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - D M Markoff
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - W Tornow
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - S Dell'Oro
- Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - T O'Donnell
- Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - J A Detwiler
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - S Enomoto
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M P Decowski
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nikhef and the University of Amsterdam, Science Park, Amsterdam, Netherlands
| | - C Grant
- Boston University, Boston, Massachusetts 02215, USA
| | - A Li
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Boston University, Boston, Massachusetts 02215, USA
| | - H Song
- Boston University, Boston, Massachusetts 02215, USA
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2
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Takechi K, Shimizu I. Peripherally inserted central catheter line-related deep venous thrombosis. Anaesth Rep 2022; 10:e12146. [PMID: 35281515 PMCID: PMC8899903 DOI: 10.1002/anr3.12146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- K Takechi
- Department of Anaesthesia Matsuyama Red Cross Hospital Matsuyama Japan
| | - I Shimizu
- Department of Anaesthesia Matsuyama Red Cross Hospital Matsuyama Japan
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Tsukano Y, Shimizu I, Yoshida Y, Hsiao Y, Ikegami R, Hayashi Y, Suda M, Katsuumi G, Nakao M, Minamino T. Obesity associated pro-fibrotic protein augments fibrosis in heart. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3739] [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: 11/13/2022] Open
Abstract
Abstract
Chronic sterile inflammation in visceral fat has causal roles for systemic metabolic disorders in obesity. Inflamed visceral adipose tissue secretes pro-inflammatory adipokines, and this contributes to tissue remodeling under a metabolically stressed condition. Various kinds of white adipokines are broadly studied, however, roles of brown adipose tissue (BAT) derived adipokines (BATokine) remain to be explored. In this project, we tried to characterize pathogenic role of BATokine in obesity related fibrotic disorders, especially focusing on heart failure with preserved ejection fraction (HFpEF). For this purpose, we analyzed two sets of DNA microarray data, and identified an obesity associated pro-fibrotic protein (OAFP) as a possible pathogenic BATokine. Our biobank studies showed OAFP increased in patients with diastolic dysfunction, and E/e' analyzed with cardiac echo increased in direct proportion to circulating OAFP level in humans. We generated dietary obese mice model, and found OAFP increased both in BAT and circulation. We generated a murine systemic or BAT specific OAFP knockout (KO) models, and found that obesity-induced diastolic dysfunction ameliorated in these models. Cardiac fibrosis was also suppressed by genetic depletion of OAFP. We found OAFP increased in circulation in aged humans and mice, and studies in chronologically aged mice showed this molecule increased in BAT with aging. Our results indicate that OAFP is secreted predominantly from BAT, and mediates pathogenic roles by augmenting cardiac fibrosis in dietary obesity or aging. Suppression of OAFP may become a therapy for HFpEF.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Tsukano
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Hsiao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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Hayashi Y, Shimizu I, Yoshida Y, Katsuumi G, Suda M, Fujiki S, Minamino T. The crucial roles of coagulation factors in inducing brown adipose tissue dysfunction and systemic metabolic disorder in obesity. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3617] [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: 11/13/2022] Open
Abstract
Abstract
The prevalence of obesity is increasing worldwide. Obese individuals are predisposed to cardio-metabolic disorders. Brown adipose tissue (BAT) is an active metabolic organ abundant with mitochondria, and studies suggest a potential role of BAT in the maintenance of metabolic health in rodents and humans. Metabolic stress causes BAT dysfunction, but the underlying mechanisms are largely unknown. Coagulation factor Xa (FXa) is critically involved in a coagulation cascade, and it is also known to mediate biological effects by the activation of protease-activated receptor (PAR)-signaling. Accumulating evidence shows that PAR1 contributes to tissue remodeling in cardiovascular system. Analyzing deposited microarray data, we found transcripts for coagulation factors including factor VII (F7), factor X (F10), and PAR1 receptor were increased in BAT from obese mice. Here we show a previously unknown role of FXa-PAR signaling in promoting BAT dysfunction and systemic metabolic disorder in a murine dietary obese model.
Imposing a high fat diet (HFD) on C57BL/6NCr mice led to a marked increase in tissue factor (TF), coagulation factor VII and FXa in BAT. TF-FVIIa (activated form of FVII)-FXa complex is known to activate PAR1, and we found a significant increase in PAR1 expression in BAT upon metabolic stress. Administration of a FXa inhibitor ameliorated BAT whitening, improved thermogenic response and systemic glucose intolerance upon dietary obesity. Fxa inhibition reduced reactive oxygen species (ROS) level in BAT. In contrast, administration of warfarin did not show any phenotype in BAT. BAT specific TF and PAR1 over-expression model showed significant whitening of this tissue, which was associated with systemic glucose intolerance. We generated BAT specific PAR1 KO mice. BAT-PAR1 KO mice exhibited re-browning of BAT along with reduced ROS level in this tissue. In BAT-PAR1 KO mice, glucose intolerance and thermogenic response under a metabolically stressed condition were ameliorated. In differentiated brown adipocytes, FXa markedly increased mitochondrial ROS and reduced mitochondrial membrane potential. Inhibition of PAR1 ameliorated FXa-induced mitochondrial ROS production and reduction in membrane potential. We also found that plasma FXa level did not increase in obese mice as well as in obese individuals. These results suggest the previously unknown role of coagulation systems in promoting BAT dysfunction, leading to systemic metabolic disorders. Maintenance of BAT homeostasis through the suppression of FXa-PAR1 signaling would become a new therapeutic target for obesity and diabetes.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Hayashi
- Niigata University, Department of cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Department of Molecular Aging and Cell Biology, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Department of Molecular Aging and Cell Biology, Niigata, Japan
| | - G Katsuumi
- Niigata University, Department of cardiovascular Biology and Medicine, Niigata, Japan
| | - M Suda
- Niigata University, Department of cardiovascular Biology and Medicine, Niigata, Japan
| | - S Fujiki
- Niigata University, Department of cardiovascular Biology and Medicine, Niigata, Japan
| | - T Minamino
- Niigata University, Department of cardiovascular Biology and Medicine, Niigata, Japan
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Suda M, Shimizu I, Katsuumi G, Yoshida Y, Hayashi Y, Nakao M, Ikegami R, Furuuchi R, Ozawa T, Ozaki K, Minamino T. Elimination of senescent cells targeting Senescence associated glycoprotein (SAGP) improved the ageing-associated diseases and extended the lifespan. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3573] [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: 11/13/2022] Open
Abstract
Abstract
Cellular senescence entails an irreversible growth arrest and a pro-inflammatory secretory phenotype, which contributes to aging-associated disorders such as atherosclerosis and diabetes, however, underlying mechanisms are largely unknown. In this study, we identified a novel protein, senescence-associated glycoprotein (SAGP), as a biomarker of cellular senescence and we also found that elimination of senescent cells targeting SAGP attenuated aging-associated disorders such as atherosclerosis, diabetes and frailty.
First, we identified that SAGP as a senescent marker by microarray analysis of senescent human endothelial cells compared with young endothelial cells. The expression of SAGP was significantly increased in the aorta of chronological aging mice and ApoE-knockout mice. Then we measured SAGP expression in the patients registered in our hospital and found that mean SAGP expression was significantly higher in patients with atherosclerotic diseases compared to patients without atherosclerotic diseases. These data suggest that SAGP would become the novel marker of cellular senescence and/or aging-associated disorders.
We found SAGP co-localized with lysosome and bound to V-ATPase, proton pump in the acid organelles such as lysosome. The electron microscopy analysis revealed that the dysfunctional lysosomes were accumulated in SAGP knockdown endothelial cell. The genetic deletion of SAGP resulted in the increase of lysosomal pH and the suppression of mitochondrial autophagy, mitophagy. And this associated with the high level of mitochondrial reactive oxygen species (ROS) and promoted premature senescence in human endothelial cells. These data suggest that SAGP was induced by the lysosomal stress in the senescent cells to protects senescent cells by maintaining the lysosomal homeostasis.
Recently, it is reported that elimination of senescent cells (senolysis) reversibly improved pathological aging phenotypes and also extended the lifespan. We established senolytic therapy targeting SAGP. We generated SAGP-DTR (diphtheria toxin receptor) transgenic mice, in which we could eliminate the SAGP- positive senescent cells using DT (diphtheria toxin). We found elimination of SAGP positive senescent cells significantly reduced the atherosclerotic plaque burden in the aorta of ApoE-KO mice and improved the glucose metabolism of dietary obese mice, indicating that SAGP could be a useful target for senolytic therapy. For clinical implication, we then developed a cytotoxic vaccine targeting SAGP. Treatment with SAGP vaccine successfully eliminated SAGP positive senescent cells and attenuated atherosclerosis and metabolic dysfunction. Surprisingly, administration of SAGP vaccine to Zmpste24-KO mice, premature aging mice, extended the lifespan. These data indicate that targeting SAGP-positive cells could be a novel strategy for senolytic therapy.
Effect of SAGP vaccine
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): Grant-in-Aid for Scientific Research by Japan Society for the Promotion of Science (JSPS)
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Affiliation(s)
- M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - I Shimizu
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Y Yoshida
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Furuuchi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Ozawa
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - K Ozaki
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Hsiao Y, Shimizu I, Wakasugi T, Jiao S, Watanabe T, Kashimura T, Yoshida Y, Hanawa H, Ozaki K, Minamino T. Cardiac mitofusin-1 is declined in non-responding patients with idiopathic dilated cardiomyopathy. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3601] [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: 11/13/2022] Open
Abstract
Abstract
Background/Introduction
Mitochondria are dynamic regulators of cellular metabolism and homeostasis. The dysfunction of mitochondria has long been considered a major contributor to aging and age-related diseases. The prognosis of severe heart failure is still unacceptably poor and it is urgent to establish new therapies for this critical condition. Some patients with heart failure do not respond to established multidisciplinary treatment and they are classified as “non-responders”. The outcome is especially poor for non-responders, and underlying mechanisms are largely unknown.
Purpose
Studies indicate mitochondrial dysfunction has causal roles for metabolic remodeling in the failing heart, but underlying mechanisms remain to be explored. This study tried to elucidate the role of Mitofusin-1 in a failing heart.
Methods
We examined twenty-two heart failure patients who underwent endomyocardial biopsy of intraventricular septum. Patients were classified as non-responders when their left-ventricular (LV) ejection fraction did not show more than 10% improvement at remote phase after biopsy. Fourteen patients were classified as responders, and eight as non-responders. Electron microscopy, quantitative PCR, and immunofluorescence studies were performed to explore the biological processes or molecules involved in failure to respond. In addition to studies with cardiac tissue specific knockout mice, we also conducted functional in-vitro studies with neonatal rat ventricular myocytes.
Results
Twenty-two patients with IDCM who underwent endomyocardial biopsy were enrolled in this study, including 14 responders and 8 non-responders. Transmission electron microscopy (EM) showed a significant reduction in mitochondrial size in cardiomyocytes of non-responders compared to responders. Quantitative PCR revealed that transcript of mitochondrial fusion protein, Mitofusin-1, was significantly reduced in non-responders. Studies with neonatal rat ventricular myocytes (NRVMs) indicated that the beta-1 adrenergic receptor-mediated signaling pathway negatively regulates Mitofusin-1 expression. Suppression of Mitofusin-1 resulted in a significant reduction in mitochondrial respiration of NRVMs. We generated left ventricular pressure overload model with thoracic aortic constriction (TAC) in cardiac specific Mitofusin-1 knockout model (c-Mfn1 KO). Systolic function was reduced in c-Mfn1 KO mice, and EM study showed an increase in dysfunctional mitochondria in the KO group subjected to TAC.
Conclusions
Mitofusin-1 becomes a biomarker for non-responders with heart failure. In addition, our results suggest that therapies targeting mitochondrial dynamics and homeostasis would become next generation therapy for severe heart failure patients.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Hsiao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Division of Molecular Aging and Cell Biology, Niigata, Japan
| | - T Wakasugi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - S Jiao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Watanabe
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Kashimura
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - H Hanawa
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - K Ozaki
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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7
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Katsuumi G, Shimizu I, Suda M, Yoshida Y, Hayashi Y, Nakao M, Furuuchi R, Hsiao Y, Minamino T. A novel senolytic drug, seno-7284 ameliorates aging phenotype and age-related cardiometabolic diseases. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Cellular senescence occurs as a result of various genotoxic stresses and it plays a pivotal role in aging and age-related disorders. Recently, it was shown that elimination of senescent cells, so-called “senolysis” has the potential to become a promising novel therapy for age-related disorders in several mice models including cardiovascular diseases. However, there is no senolytic drug available in clinical settings currently.
Purpose
The present study was aimed to identify a novel senolytic reagent effective for cardiometabolic disease among compounds already available in clinical settings. Here we demonstrate that a compound called “seno-7284” exhibits senolytic effect in murine models of type 2 diabetes, atherosclerosis, progeroid and chronological aging.
Methods
We generated diet-induced obesity/diabetic mice model by imposing high-fat diet from 4-week-old for two months, atherosclerosis mice model by imposing western diet to ApoE homozygous knockout mice (ApoE-KO mice) from 4-week-old for 3 months. We administered seno-7284 mixed in the diet (0.03% w/w) to each mouse model for 1, 2 or 4 weeks. For the analysis, we carried out some physiological examinations including glucose tolerance test (GTT) and insulin tolerance test (ITT), then harvested tissue samples and took them to molecular biological analysis including real-time PCR, western blotting, RNA-sequence, etc. We also generated Zmpste24 homozygous knockout mice (Zmpste24-KO mice) as a progeroid mice model to measure their lifespan. Seno-7284 was administered to Zmpste24-KO mice from 12-week-old to the end of life. We also administrated seno-7284 to chronological aged mice at 1-year-old for 20 weeks and their physical function was examined with rotarod running test and hand-grip test.
Results
Seno-7284 reduced the accumulation of senescent cells in visceral adipose tissue of dietary obese mice as senescence-associated beta-galactosidase (SA-beta-gal) staining exhibits (Figure 1a). This effect results in ameliorating insulin tolerance (Figure 1b) and adipose tissue inflammation after 4-week administration of seno-7284. We also found administrating Seno-7284 for two weeks also reduced the accumulation of senescent cells in the atherosclerotic lesion in the aorta of ApoE-KO mice (Figure 1c) and inhibited advancing atherosclerosis (Figure 1d). Surprisingly, seno-7284 significantly improved the lifespan of Zmpste24 KO mice (Figure 1e). Seno-7284 also improved the physical function of chronologically aged mice by administrating it from 1-year-old for 20 weeks (Figure 1f). In-vitro studies didn't exhibit seno-7284 kills senescent cells directly, but further analysis including RNA-seq or metabolomic analysis speculated that seno-7284 stimulates endogenous senolytic function of NK-cells and CD8+ T-cells.
Conclusion
Our results indicate that seno-7284 would become a promising senolytic drug that exhibits novel therapeutic machinery for aging and age-related cardiometabolic diseases.
Figure 1
Funding Acknowledgement
Type of funding source: Public grant(s) – National budget only. Main funding source(s): Grant-in-Aid for Scientific Research (KAKENHI) C, Niigata University Tsukada medical research grant
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Affiliation(s)
- G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Molecular Aging and Cell Biology, Niigata, Japan
| | - M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Molecular Aging and Cell Biology, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - R Furuuchi
- Niigata University Graduate School of Medical and Dental Sciences, Molecular Aging and Cell Biology, Niigata, Japan
| | - Y.T Hsiao
- Niigata University Graduate School of Medical and Dental Sciences, Molecular Aging and Cell Biology, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
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8
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Hsiao Y, Shimizu I, Yoshida Y, Ikegami R, Hayashi Y, Suda M, Katsuumi G, Wakasugi T, Nakao M, Minamino T. Circulating pro fibrotic protein promotes fibrosis in liver. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3740] [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/Introduction
Non-alcoholic steatohepatitis (NASH), driven by the obesity epidemic, has become the most common form of liver disease. Inflamed visceral adipose tissue secretes pro-inflammatory adipokines that are causal for systemic metabolic disorders. Role of adipokines in NASH, especially those from brown adipose tissues (BATokine) remain unclear.
Purpose
To show the pathogenic role of BATokine in NASH.
Methods
To identify and characterize the pathological roles of pro-fibrotic BATokine, we generated a murine obese NASH model by imposing a high fat diet in C57BL6/NCr mice, and murine systemic or BAT specific knockout (KO) models. We also conducted functional in-vitro studies with differentiated brown adipocytes.
Results
Analyzing two sets of DNA micro array data with bioinformatics, we identified a secreted form pro-fibrotic protein (sPFP) expressed in dysfunctional brown adipose tissues (BAT) in mice. Testing our biobank samples, we found this protein increased in plasma of NASH patients. We generated a murine obese NASH model by imposing a high fat diet in C57BL6/NCr mice for 9–10 months since 4 weeks of age, and found that sPFP is produced predominantly by BAT. In this model, we also found that sPFP increased in plasma. We generated a murine systemic or BAT specific sPFP knockout (KO) models and found that liver fibrosis ameliorated in these models. We also suppressed circulating sPFP with a peptide vaccine targeting this molecule, and found that sPFP vaccination therapy inhibited liver fibrosis. Next, we generated sPFP gain of function (GOF) model by the administration of plasmid encoding sPFP into skeletal muscle. Liver fibrosis augmented in sPFP-GOF model, and these results suggested that sPFP has causal role for the progression of fibrotic response in liver. In vitro studies with differentiated brown adipocytes showed that metabolic stress increased c-Fos in nuclear, and this was causal for an increase in sPFP level.
Conclusions
Our results suggest that one of the BATokines, sPFP, contributes for the progression of fibrotic responses in obese-NASH model. Inhibition of sPFP may become a therapy for NASH or obesity related fibrotic disorders.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- Y Hsiao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Wakasugi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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9
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Ishihara K, Izawa KP, Kitamura M, Ogawa M, Shimogai T, Kanejima Y, Morisawa T, Shimizu I. Relation of Poor Nutritional Status to Mild Cognitive Impairment in Patients with Coronary Artery Disease. J Nutr Health Aging 2020; 24:1080-1086. [PMID: 33244564 DOI: 10.1007/s12603-020-1428-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 12/17/2022]
Abstract
OBJECTIVES Nutritional status affects cerebral circulation and cognitive function. More attention needs to be paid to nutritional status in coronary artery disease (CAD) patients, yet the relation between nutritional status or dietary intake (DI) and cognitive function or mild cognitive impairment (MCI) in CAD patients remain unclear. Thus, we examined the following relations: 1) that between nutritional status and cognitive function, and MCI and 2) that between DI and cognitive function, and MCI. DESIGN, SETTING, AND PARTICIPANTS We conducted a cross-sectional study of 208 patients with CAD but without dementia. MEASUREMENTS MCI was estimated with the Japanese version of the Montreal Cognitive Assessment (MoCA-J). Nutritional status was assessed by the Geriatric Nutritional Risk Index (GNRI), and DI was assessed by total energy intake per day. We investigated the relation between nutritional status or DI and cognitive function by Pearson correlation analysis, and that between nutritional status or DI and MCI by multivariable logistic regression analysis. RESULTS The GNRI and DI were positively associated with the MoCA-J score (r = 0.23, p < 0.001, and r = 0.24, p < 0.001, respectively), and both were independently associated with MCI in the multivariable logistic regression analysis (odds ratio, 0.96; p = 0.045, and odds ratio, 0.998; p = 0.020, respectively). CONCLUSIONS Poor nutritional status and low DI were found to be significantly associated with cognitive function and MCI in CAD patients. Our findings regarding nutritional status and DI might be useful for clinicians to prevent or intervene in the early cognitive decline of inpatients with CAD.
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Affiliation(s)
- K Ishihara
- Kazuhiro P. Izawa, Department of Public Health, Graduate School of Health Sciences, Kobe University, 10-2 Tomogaoka 7-chome, Suma-ku, Kobe 654-0142, Japan, Tel: +81-78-796-4566; E-mail:
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10
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Suda M, Shimizu I, Yoshida Y, Katsuumi G, Hayashi Y, Ikegami R, Furuuchi R, Nakao M, Ozawa T, Minamino T. 5892Elimination of cells expressing Senescence associated glycoprotein (SAGP) attenuates the atherosclerotic diseases. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0084] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Cellular senescence is defined as a state of irreversible growth arrest and is accompanied by changes of both cell morphology and gene expression. Although accumulation of senescent vascular endothelial cells impair the vessel homeostasis and promote atherosclerotic diseases, underlying mechanisms are largely unknown. In this study, we identified a novel protein, senescence-associated glycoprotein (SAGP), as a biomarker of cellular senescence and we found modulation of SAGP or elimination of senescent cells targeting SAGP would become a novel therapy for atherosclerotic diseases.
We found that SAGP expression was significantly increased in human endothelial cells undergoing replicative senescence compared with young endothelial cells. We also found SAGP expression in aorta was significantly increased both in chronological aging mice or ApoE knockout mice. Furthermore, we measured SAGP expression in patients registered in our hospital and found that mean SAGP expression was significantly higher in patients with atherosclerotic diseases compared to patients without atherosclerotic diseases.These data suggest that SAGP would become a novel cellular senescence and/or atherosclerotic disease marker.
Genetic deletion of SAGP resulted in high level of mitochondrial reactive oxygen species (ROS) and promoted premature senescence in human endothelial cells. And this associated with suppression of mitochondrial autophagy, mitophagy. We found SAGP co-localized with lysosome by immunocytochemistry. In addition, the electron microscopy analysis revealed that the dysfunctional lysosomes were accumulated in SAGP knockdown endothelial cell, suggesting that SAGP maintain lysosomal homeostasis.
Next, wegenerated ApoE-KO/ SAGP overexpression mice and found that atherosclerotic plaque burden was attenuated in these double-transgenic mice. In contrast, SAGP/ApoE double knockout mice showed progression in atherosclerosis. These data suggest that modulation of SAGPwould become a new therapeutic target for atherosclerotic diseases.
SAGP vaccine
Recently, it is reported that elimination of senescent cells (senolysis) reversibly improved pathological aging phenotypes and also extended the lifespan. We have taken another approach for atherosclerotic diseases, senolytic therapy targeting SAGP. We generated SAGP-DTR (diphtheria toxin receptor) transgenic mice, in which we could eliminate the SAGP- positive senescent cells using DT (diphtheria toxin). We found elimination of SAGP positive senescent cells significantly reduced the atherosclerotic plaque burden, indicating that SAGP would become a useful target for senolytic therapy. We then developed a cytotoxic vaccine targeting SAGP. Treatment with SAGP vaccine successfully eliminated SAGP positive senescent cells. Administration of SAGP vaccine to ApoE-KO mice significantly reduced atherogenesis. These data indicate that targeting SAGP-positive cells could become a strategy for senolytic therapy.
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Affiliation(s)
- M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - I Shimizu
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - Y Yoshida
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Furuuchi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Ozawa
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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11
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Nakao M, Shimizu I, Yoshida Y, Katsuumi G, Hayashi Y, Ikegami R, Suda M, Wakasugi T, Minamino T. P3496Empagliflozin improves cardiac function through the increased production of acetylcarnitine in a murine non-diabetic heart failure model. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0363] [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: 11/13/2022] Open
Abstract
Abstract
Background
Empagliflozin is a renal sodium glucose transporter 2 (SGLT2) inhibitor, thereby mediates its anti-diabetic effect via excretion of glucose into urine. EMPA-REG OUTCOME study, the first big randomized control trial of empagliflozin have shown significant reduction of mortality and hospitalization due to heart failure in diabetic patients. This trial hasn't only had a huge impact to cardiovascular field, but also raised a number of questions about underlying mechanisms. It is also uncertain about the efficacy of empagliflozin in non-diabetic heart failure. In this study, we aimed to elucidate the biological effects and its underling mechanism of empagliflozin in a murine non-diabetic heart failure model.
Methods
We generated a heart failure murine model due to left ventricular (LV) pressure overload by performing transverse aortic constriction (TAC) operation to C57BL/6NCr mice. Two weeks after TAC operation we started empagliflozin administration mixed with diet at the ratio of 0.03% w/w. LV function was measured with echocardiography after administration of empagliflozin for two weeks (four weeks after TAC operation) and compared to a littermate control (no treatment) group. Then, heart samples were collected and subjected to further studies including metabolomic analysis. In-vitro studies including Seahorse Extracellular Flux Analyzer were also conducted with differentiated C2C12 cells and neonatal rat ventricular myocytes (NRVM).
Results
We found that empagliflozin treatment (Empa) significantly ameliorated LV systolic dysfunction induced by TAC compared to control group (Con) (figure.A) while heart weight/body weight ratio wasn't reduced. To explore key metabolites that can contribute to improvement of LV function, we conducted metabolomic analysis and found that empagliflozin significantly increased plasma acetylcarnitine level both in sham and TAC groups (figure.B). Previous studies have shown that acetylcarnitine acts as a substrate of acetyl CoA to fuel tricarboxylic acid cycle, and we tested the efficacy of acetylcarnitine for mitochondrial respiration capacity in differentiated C2C12 cells with Seahorse Extracellular Flux Analyzer. This analysis revealed that administration of acetylcarnitine resulted in a significant increase of oxygen consumption reflected by enhancing mitochondrial respiration. Similary, acetylcarnitine also markedly ameliorated impairment of mitochondrial respiration induced by isoproterenol in NRVM.
Conclusion
Our results indicated that empagliflozin has cardioprotective effect in murine heart failure model by enhancing mitochondrial respiration through the increased production of acetylcarnitine. We provide new evidence that empagliflozin would become a promising therapeutic agent to heart failure without diabetes.
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Affiliation(s)
- M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Division of Molecular Aging and Cell Biology, Niigata University Graduate School of Medical and Dent, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Division of Molecular Aging and Cell Biology, Niigata University Graduate School of Medical and Dent, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Wakasugi
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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12
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Tsukano Y, Shimizu I, Yoshida Y, Ikegami R, Hayashi Y, Suda M, Katsuumi G, Wakasugi T, Nakao M, Minamino T. P2591Circulating pro fibrotic protein promotes fibrosis in liver and heart. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0917] [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: 11/12/2022] Open
Abstract
Abstract
Analyzing two sets of DNA micro array data with bioinformatics, we identified a secreted form pro-fibrotic protein (sPFP) expressed in dysfunctional brown adipose tissue (BAT) in mice. Testing our biobank samples, we found this protein increased in plasma of non-alcoholic steatohepatitis (NASH) patients or aged individuals. We generated a murine obese NASH model by imposing a high fat diet in C57BL/6NCr mice for 9–10 months since 4 weeks of age, and found that sPFP is produced predominantly by BAT. In this model, we also found that sPFP increased in plasma. We generated a murine systemic sPFP knockout (KO) model and found that liver fibrosis ameliorated in sPFP-KO model. We also suppressed circulating sPFP with a peptide vaccine targeting this molecule, and found that sPFP vaccination therapy inhibited liver fibrosis. Next, we generated sPFP gain of function (GOF) model by the administration of plasmid encoding sPFP into skeletal muscle. Liver fibrosis augmented in sPFP-GOF model, and these results suggested that sPFP has causal role for the progression of fibrotic response in liver. In the obese NASH model, we found that cardiac fibrosis also developed and it ameliorated in sPFP-KO model, indicating that sPFP may have pathological roles for heart failure with preserved ejection fraction (HFpEF) related with age-related disorders. In addition to an increase in circulating sPFP in aged individuals, we found that sPFP increased in BAT of chronological aged mice model. In vitro studies with differentiated brown adipocytes showed that c-Fos upregulated sPFP in transcript level. Our results suggest that sPFP contributes for the progression of fibrotic responses in obese or aged models. Inhibition of sPFP may become a therapy for NASH or HFpEF.
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Affiliation(s)
- Y Tsukano
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - T Wakasugi
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Cardiology, Niigata, Japan
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13
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Yoshida Y, Shimizu I, Walsh K, Minamino T. P1613Brown adipose tissue dysfunction has a critical role for the development of heart failure in murine pressure overload model. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0372] [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
Prognosis of severe heart failure is unacceptably high, and it is our urgent task to find therapies for this critical condition. It has been reported that low body temperature predicts poor clinical outcomes in patients with heart failure, however, underlying mechanisms and pathological implications are largely unknown. Brown adipose tissue (BAT) was initially characterized as a heat generating organ, and studies suggest that BAT has crucial roles for the maintenance of systemic metabolic health. Here we show that BAT dysfunction develops in a murine thoracic aortic constriction (TAC) model, and has a causal role for promoting pathologies in failing heart. TAC operation led to a significant reduction both in intraperitoneal and subcutaneous temperature. TUNEL-positive cells significantly increased in BAT during left ventricular (LV)-pressure overload, and in-vitro studies with differentiated brown adipocytes suggested that the chronic activation of adrenergic signaling promotes apoptosis in these cells. Gain of BAT function model, generated with BAT implantation into peritoneal cavity, improved thermogenesis and ameliorated cardiac dysfunction in TAC. In contrast, genetic model of BAT dysfunction promoted cardiac dysfunction. Metabolomic analyses showed that BAT dysfunction led to an increase of oxidized choline that promoted metabolic dysfunction in the failing heart. Electron microscope study showed that oxidized choline induced mitochondrial dysfunction in vitro as well as in vivo settings. Extracellular flux analyzerindicated that oxidized choline suppresses oxidative phosphorylation in mitochondria. We found that dilated cardiomyopathy patients have lower body temperature, and confirmed by metabolomic study that both choline and oxidized choline are increased in circulation. Maintenance of BAT homeostasis and suppression of oxidized choline would become a novel therapeutic target for heart failure.
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Affiliation(s)
- Y Yoshida
- Niigata University, Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University, Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
| | - K Walsh
- Boston University, School of Medicine, Molecular Cardiology and Whitaker Cardiovascular Institute, Boston, United States of America
| | - T Minamino
- Niigata University, Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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14
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Gando A, Gando Y, Hachiya T, Ha Minh M, Hayashida S, Honda Y, Hosokawa K, Ikeda H, Inoue K, Ishidoshiro K, Kamei Y, Kamizawa K, Kinoshita T, Koga M, Matsuda S, Mitsui T, Nakamura K, Ono A, Ota N, Otsuka S, Ozaki H, Shibukawa Y, Shimizu I, Shirahata Y, Shirai J, Sato T, Soma K, Suzuki A, Takeuchi A, Tamae K, Ueshima K, Watanabe H, Chernyak D, Kozlov A, Obara S, Yoshida S, Takemoto Y, Umehara S, Fushimi K, Hirata S, Berger BE, Fujikawa BK, Learned JG, Maricic J, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, O'Donnell T, Detwiler JA, Enomoto S, Decowski MP, Menéndez J, Dvornický R, Šimkovic F. Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements. Phys Rev Lett 2019; 122:192501. [PMID: 31144924 DOI: 10.1103/physrevlett.122.192501] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 03/11/2019] [Indexed: 06/09/2023]
Abstract
We present a precision analysis of the ^{136}Xe two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ_{31}^{2ν}=-0.26_{-0.25}^{+0.31}. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the ξ_{31}^{2ν} range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ_{31}^{2ν} values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ_{31}^{2ν} provides new insights toward reliable neutrinoless ββ NMEs.
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Affiliation(s)
- A Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Hachiya
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - M Ha Minh
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Hayashida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Honda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Hosokawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ikeda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Inoue
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Ishidoshiro
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Kamei
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Kamizawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Kinoshita
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - M Koga
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - S Matsuda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Mitsui
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - A Ono
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - N Ota
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Otsuka
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ozaki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Shibukawa
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - I Shimizu
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Shirahata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - J Shirai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Sato
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Soma
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Takeuchi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Tamae
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ueshima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Watanabe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - D Chernyak
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - A Kozlov
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - S Obara
- Kyoto University, Department of Physics, Kyoto 606-8502, Japan
| | - S Yoshida
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Y Takemoto
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - S Umehara
- Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
| | - K Fushimi
- Department of Physics, Tokushima University, Tokushima 770-8506, Japan
| | - S Hirata
- Graduate School of Integrated Arts and Sciences, Tokushima University, Tokushima 770-8502, Japan
| | - B E Berger
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B K Fujikawa
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J G Learned
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - J Maricic
- Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
| | - L A Winslow
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Y Efremenko
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - H J Karwowski
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - D M Markoff
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - W Tornow
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - T O'Donnell
- Center for Neutrino Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - J A Detwiler
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - S Enomoto
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M P Decowski
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nikhef and the University of Amsterdam, Science Park, Amsterdam, the Netherlands
| | - J Menéndez
- Center for Nuclear Study, The University of Tokyo, Tokyo 113-0033, Japan
| | - R Dvornický
- Department of Nuclear Physics and Biophysics, Comenius University, Mlynská dolina F1, SK-842 48 Bratislava, Slovakia
- Dzhelepov Laboratory of Nuclear Problems, JINR 141980 Dubna, Russia
| | - F Šimkovic
- Department of Nuclear Physics and Biophysics, Comenius University, Mlynská dolina F1, SK-842 48 Bratislava, Slovakia
- Bogoliubov Laboratory of Theoretical Physics, JINR 141980 Dubna, Russia
- Czech Technical University in Prague, 128-00 Prague, Czech Republic
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15
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Suda M, Shimizu I, Yoshida Y, Hayashi Y, Katsuumi G, Ikegami R, Wakasugi T, Nagasawa A, Nakao M, Furuuchi R, Ujiie A, Ozawa T, Minamino T. P595Senescence-associated glycoprotein (SAGP) inhibits age-related endothelial dysfunction by the activation of mitophagy in vascular diseases. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p595] [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: 11/14/2022] Open
Affiliation(s)
- M Suda
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - I Shimizu
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - Y Yoshida
- Niigata University, Division of molecular aging and cell biology, Niigata, Japan
| | - Y Hayashi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - G Katsuumi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Ikegami
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Wakasugi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - A Nagasawa
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - M Nakao
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - R Furuuchi
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - A Ujiie
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Ozawa
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Nagasawa A, Shimizu I, Yokoyama M, Yoshida Y, Tsuchida M, Minamino T. P1838Vascular function is negatively regulated by endothelial p53 in hyperglycemic and hypoxic conditions. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1838] [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)
- A Nagasawa
- Niigata University Graduate School of Medical and Dental Sciences, Division of Thoracic and Cardiovascular Surgery, Niigata, Japan
| | - I Shimizu
- Niigata University Graduate School of Medical and Dental Sciences, Division of Molecular Aging and Cell Biology, Niigata, Japan
| | - M Yokoyama
- Chiba University Graduate School of Medicine, Department of Cardiovascular Medicine, Chiba, Japan
| | - Y Yoshida
- Niigata University Graduate School of Medical and Dental Sciences, Division of Molecular Aging and Cell Biology, Niigata, Japan
| | - M Tsuchida
- Niigata University Graduate School of Medical and Dental Sciences, Division of Thoracic and Cardiovascular Surgery, Niigata, Japan
| | - T Minamino
- Niigata University Graduate School of Medical and Dental Sciences, Department of Cardiovascular Biology and Medicine, Niigata, Japan
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17
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Yoshida Y, Shimizu I, Walsh K, Minamino T. 5212Impaired function of brown adipose tissue is involved in the pathologies of pressure overload-induced heart failure. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.5212] [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)
- Y Yoshida
- Niigata University, Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - I Shimizu
- Niigata University, Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
| | - K Walsh
- Boston University, School of Medicine, Molecular Cardiology and Whitaker Cardiovascular Institute, Boston, United States of America
| | - T Minamino
- Niigata University, Graduate School of Medical and Dental Sciences, Cardiovascular Biology and Medicine, Niigata, Japan
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18
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Iimura Y, Jones K, Takada L, Shimizu I, Koyama M, Hattori K, Okazawa Y, Nonoda Y, Asano E, Akiyama T, Go C, Ochi A, Snead OC, Donner EJ, Rutka JT, Drake JM, Otsubo H. Strong coupling between slow oscillations and wide fast ripples in children with epileptic spasms: Investigation of modulation index and occurrence rate. Epilepsia 2018; 59:544-554. [PMID: 29315516 DOI: 10.1111/epi.13995] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2017] [Indexed: 01/25/2023]
Abstract
OBJECTIVE Epileptic spasms (ES) often become drug-resistant. To reveal the electrophysiological difference between children with ES (ES+) and without ES (ES-), we compared the occurrence rate (OR) of high-frequency oscillations (HFOs) and the modulation index (MI) of coupling between slow and fast oscillations. In ES+, we hypothesized that (1) pathological HFOs are more widely distributed and (2) slow oscillations show stronger coupling with pathological HFOs than in ES-. METHODS We retrospectively reviewed 24 children with drug-resistant multilobar onset epilepsy, who underwent intracranial video electroencephalography prior to multilobar resections. We measured the OR of HFOs and determined the electrodes with a high rate of HFOs by cluster analysis. We calculated MI, which reflects the degree of coupling between HFO (ripple/fast ripple [FR]) amplitude and 5 different frequency bands of delta and theta activities (0.5-1 Hz, 1-2 Hz, 2-3 Hz, 3-4 Hz, 4-8 Hz). RESULTS In ES+ (n = 10), the OR(FRs) , the number of electrodes with high-rate FRs, and the MI(FRs & 3-4 Hz) in all electrodes were significantly higher than in ES- (n = 14). In both the ES+ and ES- groups, MI(ripples/FRs & 3-4 Hz) was the highest among the 5 frequency bands. Within the good seizure outcome group, the OR(FRs) and the MI(FRs & 3-4 Hz) in the resected area in ES+ were significantly higher than in ES- (OR[FRs] , P = .04; MI[FRs & 3-4 Hz] , P = .04). SIGNIFICANCE In ES+, the larger number of high-rate FR electrodes indicates more widespread epileptogenicity than in ES-. High values of OR(FRs) and MI(FRs & 3-4 Hz) in ES+ compared to ES- are a signature of the severity of epileptogenicity. We proved that ES+ children who achieved seizure freedom following multilobar resections exhibited strong coupling between slow oscillations and FRs.
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Affiliation(s)
- Yasushi Iimura
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kevin Jones
- Division of Neurology, Department of Pediatrics, McMaster Children's Hospital, Hamilton, Ontario, Canada
| | - Lynne Takada
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Itsuki Shimizu
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Misaki Koyama
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Kyoko Hattori
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Yushi Okazawa
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Yutaka Nonoda
- Pediatrics and Neurology, Children's Hospital of Michigan, Wayne State University, Detroit, MI, USA
| | - Eishi Asano
- Pediatrics and Neurology, Children's Hospital of Michigan, Wayne State University, Detroit, MI, USA
| | - Tomoyuki Akiyama
- Department of Child Neurology, Okayama University Hospital, Okayama, Japan
| | - Cristina Go
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Ayako Ochi
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - O Carter Snead
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Elizabeth J Donner
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - James T Rutka
- Division of Neurosurgery, Hospital for Sick Children, Toronto, Ontario, Canada
| | - James M Drake
- Division of Neurosurgery, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Hiroshi Otsubo
- Division of Neurology, Hospital for Sick Children, Toronto, Ontario, Canada
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19
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Miyauchi M, Ishibashi F, Hondo M, Shimizu I, Yanagisawa M. The effect of zonisamide on abnormal muscle tone during REM sleep in a mouse model of REM sleep behavior disorder. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.668] [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: 11/30/2022]
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20
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Ikegami R, Shimizu I, Sato T, Jiao Y, Yoshida Y, Suda M, Hayashi Y, Kayamori H, Katsuumi G, Minamino T. P1588The pathological role of gamma-aminobutyric acid (GABA) signaling in promoting brown adipose tissue dysfunction in obesity. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p1588] [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: 11/14/2022] Open
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21
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Katsuumi G, Shimizu I, Yoshida Y, Suda M, Hayashi Y, Jiao S, Minamino T. P3997Catecholamine-induced cellular senescence in endothelium and bone marrow promotes cardiac inflammation and remodeling in mice. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3997] [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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22
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Suda M, Shimizu I, Yoshida Y, Hayashi Y, Katsuumi G, Kayamori H, Ikegami R, Jiao S, Wakasugi T, Nagasawa A, Ujiie A, Ozawa T, Minamino T. P178A novel protein Senescence-associated glycoprotein (SAGP) is involved in the vessel homeostasis in murine hind limb ischemia model. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p178] [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: 11/12/2022] Open
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23
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Hayashi Y, Shimizu I, Yoshida Y, Ikegami R, Katsuumi G, Suda M, Kayamori H, Minamino T. P2096The pathological role of coagulation factors in promoting brown adipose tissue dysfunction and systemic metabolic disorder in obesity. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2096] [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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24
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Nagasawa A, Shimizu I, Yoshida Y, Tsuchida M, Minamino T. P3474Endothelial p53 is involved in the vascular dysfunction of hyperglycemic and ischemic conditions. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3474] [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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25
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Gando A, Gando Y, Hachiya T, Hayashi A, Hayashida S, Ikeda H, Inoue K, Ishidoshiro K, Karino Y, Koga M, Matsuda S, Mitsui T, Nakamura K, Obara S, Oura T, Ozaki H, Shimizu I, Shirahata Y, Shirai J, Suzuki A, Takai T, Tamae K, Teraoka Y, Ueshima K, Watanabe H, Kozlov A, Takemoto Y, Yoshida S, Fushimi K, Banks TI, Berger BE, Fujikawa BK, O'Donnell T, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Detwiler JA, Enomoto S, Decowski MP. Publisher's Note: Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen [Phys. Rev. Lett. 117, 082503 (2016)]. Phys Rev Lett 2016; 117:109903. [PMID: 27636501 DOI: 10.1103/physrevlett.117.109903] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Indexed: 06/06/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.117.082503.
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26
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Gando A, Gando Y, Hachiya T, Hayashi A, Hayashida S, Ikeda H, Inoue K, Ishidoshiro K, Karino Y, Koga M, Matsuda S, Mitsui T, Nakamura K, Obara S, Oura T, Ozaki H, Shimizu I, Shirahata Y, Shirai J, Suzuki A, Takai T, Tamae K, Teraoka Y, Ueshima K, Watanabe H, Kozlov A, Takemoto Y, Yoshida S, Fushimi K, Banks TI, Berger BE, Fujikawa BK, O'Donnell T, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Detwiler JA, Enomoto S, Decowski MP. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. Phys Rev Lett 2016; 117:082503. [PMID: 27588852 DOI: 10.1103/physrevlett.117.082503] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Indexed: 06/06/2023]
Abstract
We present an improved search for neutrinoless double-beta (0νββ) decay of ^{136}Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the ^{110m}Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T_{1/2}^{0ν}>1.07×10^{26} yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.
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Affiliation(s)
- A Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Hachiya
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Hayashi
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - S Hayashida
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ikeda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Inoue
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - K Ishidoshiro
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Karino
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - M Koga
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - S Matsuda
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Mitsui
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Nakamura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - S Obara
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Oura
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Ozaki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - I Shimizu
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Shirahata
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - J Shirai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Suzuki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - T Takai
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Tamae
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - Y Teraoka
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - K Ueshima
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - H Watanabe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
| | - A Kozlov
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - Y Takemoto
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
| | - S Yoshida
- Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - K Fushimi
- Faculty of Integrated Arts and Science, University of Tokushima, Tokushima 770-8502, Japan
| | - T I Banks
- Physics Department, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B E Berger
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Physics Department, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B K Fujikawa
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Physics Department, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - T O'Donnell
- Physics Department, University of California, Berkeley, and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - L A Winslow
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Y Efremenko
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - H J Karwowski
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - D M Markoff
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - W Tornow
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA; Physics Departments at Duke University, Durham, North Carolina 27708, USA; North Carolina Central University, Durham, North Carolina 27707, USA; and The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - J A Detwiler
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - S Enomoto
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M P Decowski
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
- Nikhef and the University of Amsterdam, Science Park, Amsterdam 1098XG, The Netherlands
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Shimizu I, Yoshimoto T, Hiroi Y, Kawaki M, Sato D, Nagasawa M. Effects of speed increase gait training with a new exoskeleton robot for subacute stroke subjects. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1335] [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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Yoshimoto T, Shimizu I, Hiroi Y, Kawaki M, Sato D, Nagasawa M. Gait training with a new exoskeleton robot Hybrid Assistive Limb improves gait and balance performances in chronic stroke subjects. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Shimizu I, Ichikawa N, Takeda W, Kirihara T, Sato K, Ueki T, Hiroshima Y, Sumi M, Ueno M, Kobayashi H. Non-Thiotepa-Based HDT and ASCT for Relapsed/Refractory Secondary Central Nervous System Lymphoma. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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30
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Gando A, Gando Y, Hanakago H, Ikeda H, Inoue K, Ishidoshiro K, Kato R, Koga M, Matsuda S, Mitsui T, Motoki D, Nakada T, Nakamura K, Obata A, Oki A, Ono Y, Otani M, Shimizu I, Shirai J, Suzuki A, Takemoto Y, Tamae K, Ueshima K, Watanabe H, Xu BD, Yamada S, Yoshida H, Kozlov A, Yoshida S, Banks TI, Freedman SJ, Fujikawa BK, Han K, O'Donnell T, Berger BE, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Detwiler JA, Enomoto S, Decowski MP. Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge. Phys Rev Lett 2013; 110:062502. [PMID: 23432237 DOI: 10.1103/physrevlett.110.062502] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Indexed: 06/01/2023]
Abstract
We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of (136)Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T(1/2)(0ν)>1.9×10(25) yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T(1/2)(0ν)>3.4×10(25) yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of <m(ββ)> <(120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in (76)Ge, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.
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Affiliation(s)
- A Gando
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
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31
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Bungau A, Adelmann A, Alonso JR, Barletta W, Barlow R, Bartoszek L, Calabretta L, Calanna A, Campo D, Conrad JM, Djurcic Z, Kamyshkov Y, Shaevitz MH, Shimizu I, Smidt T, Spitz J, Wascko M, Winslow LA, Yang JJ. Proposal for an electron antineutrino disappearance search using high-rate 8Li production and decay. Phys Rev Lett 2012; 109:141802. [PMID: 23083237 DOI: 10.1103/physrevlett.109.141802] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Indexed: 06/01/2023]
Abstract
This paper introduces an experimental probe of the sterile neutrino with a novel, high-intensity source of electron antineutrinos from the production and subsequent decay of 8Li. When paired with an existing ∼1 kton scintillator-based detector, this <E(ν)> = 6.4 MeV source opens a wide range of possible searches for beyond standard model physics via studies of the inverse beta decay interaction ν(e) + p → e+ + n. In particular, the experimental design described here has unprecedented sensitivity to ν(e) disappearance at Δm2 ∼ 1 eV2 and features the ability to distinguish between the existence of zero, one, and two sterile neutrinos.
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Affiliation(s)
- A Bungau
- University of Huddersfield, Huddersfield HD1 3DH, United Kingdom
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Levesque V, Bardwell PD, Shimizu I, Haspot F, Benichou G, Yeap BY, Sykes M. B-cell-dependent memory T cells impede nonmyeloablative mixed chimerism induction in presensitized mice. Am J Transplant 2011; 11:2322-31. [PMID: 21831158 PMCID: PMC3816363 DOI: 10.1111/j.1600-6143.2011.03683.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Presensitization to HLA antigens limits the success of organ transplantation. The achievement of donor-specific tolerance via mixed chimerism could improve outcomes of transplantation in presensitized patients. In presensitized B-cell-deficient μMT B6 mice, we developed nonmyeloablative bone marrow transplantation (BMT) regimens that successfully tolerized presensitized T cells, achieving long-term (LT) multilineage chimerism and tolerance to donor-type skin. To apply these regimens in wild-type (WT) animals while avoiding antibody-mediated destruction of donor bone marrow cells, presensitized WT B6 mice were rested >2 years to allow alloantibody clearance. However, chimerism and tolerance were not reliably achieved in LT presensitized WT B6 mice in which alloantibody had declined to minimal or undetectable levels before BMT. Strong antidonor memory T-cell responses were detected in LT presensitized WT B6 mice after rejection of donor bone marrow (BM) occurred, whereas levels of alloantibody remained consistently low. In contrast, presensitized μMT B6 mice had diminished memory T-cell responses compared to WT B6 mice. These data implicate T-cell memory, but not alloantibody, in rejection of donor BM in LT presensitized WT mice.
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Affiliation(s)
- V. Levesque
- Transplantation Biology Research Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - P. D. Bardwell
- Transplantation Biology Research Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - I. Shimizu
- Transplantation Biology Research Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - F. Haspot
- Transplantation Biology Research Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - G. Benichou
- Department of Surgery, Transplantation Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - B. Y. Yeap
- Department of Medicine, Hematology/Oncology, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - M. Sykes
- Transplantation Biology Research Center, Biostatistics Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA,Corresponding author: Megan Sykes,
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Shibata N, Fukuda K, Ohtoshi H, Hanna J, Oda S, Shimizu I. Growth of Amorphous and Crystalline Silicon by HR-CVD (Hydrogen Radical Enhanced CVD). ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-95-225] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractSystematic studies have been made on preparation of Si thin films from SiF4 under control over the flow of atomic hydrogens. The gas phase reactions taking place in the mixture of fragments (SiFn) resulting from plasma-induced dissociation and atomic hydrogens were widely investigated by a mass spectroscopy. Chemically active species,i.e., SiF2H and SiH2F were found as those related to the growth of films. The growth in the vicinity of substrates involves either endothermic or radical-enhanced reaction for the propagation of the three dimensional Si networks, accompaning release of terminators such as H and F. Accordingly, Si thin films with structures from amorphous to crystalline were obtained by controlling the flow of atomic hydrogen. A marked improvement in the hole-transport was established in the Si films containing hydrogen less than 5–6 at % due to the reduction in the tail states near the valence band.
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Abstract
ABSTRACTHydrogenated amorphous silicon (a-Si:H) films were prepared by a layer-by-layer (LBL) argon treatment technique. Thin amorphous silicon layers are first deposited and then treated by Ar. Thick films are built up by repeatedly the process many times. By reducing the deposition rate during deposition time (T, sec), a-Si:H with the gaps narrower than 1·55eV were prepared at substrate temperature lower than 300°C. These narrow-gap films contained less than 2 at.% hydrogen and had rigid Si network. Also, these narrow gap films exhibited good light soaking stability.
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Onzuka T, Tomita Y, Okano S, Shimizu I, Yamada H, Yoshikai Y, Tominaga R. Antibody-mediated T-cell reduction or increased levels of chimerism overcome resistance to cyclophosphamide-induced tolerance in NKT-deficient mice. Scand J Immunol 2010; 72:106-17. [PMID: 20618769 DOI: 10.1111/j.1365-3083.2010.02417.x] [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: 11/30/2022]
Abstract
We reported that invariant NKT-cell knockout (iNKT KO) mice are resistant to the induction of intrathymic chimerism and clonal deletion in the cyclophosphamide (CP)-induced tolerance system (CPS). However, another report shows that clonal deletion with chimerism may be intact in iNKT KO recipients in a bone marrow transplantation model. We also reported that pretreatment with anti-Thy1.2 mAb, which reduces the number of T cells and iNKT cells, promotes allograft tolerance across H-2 barriers in the CPS. In this study, we evaluated the efficacy of T-cell depletion in the CPS, and the relationship between the role played by iNKT cells in central tolerance and mixed chimerism. BALB/c (H-2(d)) wild-type, or iNKT KO (Jalpha18(-/-)) mice were pretreated with 20-100 microg of anti-Thy1.2 mAb and given 10(8) donor DBA/2 (H-2(d)) spleen cells on Day 0, and 200 mg/kg CP on Day 2. Pretreatment with T-cell depletion resulted in higher levels of mixed chimerism, increased intrathymic clonal deletion of donor-reactive cells, and the induction of skin graft tolerance in iNKT KO recipients in CPS. This suggests that the high levels of mixed chimerism overcame the resistance to CP-induced tolerance in iNKT KO mice. Consistently, the enhancement of mixed chimerism by injection of tolerant donor spleen cells (SC) rendered iNKT KO recipients susceptible to CP-induced tolerance. These results suggest that iNKT-cell-mediated immunoregulation of central tolerance is evident at low levels of peripheral mixed chimerism in the CPS.
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Affiliation(s)
- T Onzuka
- Department of Cardiovascular Surgery, Faculty of Medicine, Kyushu University, Maidashi, Higashi-ku, Fukuoka, Japan
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Shimizu I, Tada N. Plastic behaviour and forming limit during biaxial compressions of magnesium alloy AZ31 at room temperature. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100616001] [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: 11/14/2022] Open
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37
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Onzuka T, Tomita Y, Shimizu I, Okano S, Yamada H, Yoshikai Y, Tominaga R. Effects of lipopolysaccharide on the induction of mixed chimerism in cyclophosphamide-induced tolerance. Scand J Immunol 2009; 70:423-30. [PMID: 19874546 DOI: 10.1111/j.1365-3083.2009.02314.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cyclophosphamide (CP)-induced tolerance is a mixed chimerism-based tolerance and is one of the strategies used to induce transplant tolerance. Toll-like receptor (TLR) agonists are reportedly able to abrogate the induction of tolerance by activating alloreactive T cells, or by inhibiting Treg cells. However, little is known about the effect of the immune response mediated by TLR on mixed chimerism-based tolerance protocols. In this study, we evaluated the influence of lipopolysaccharide (LPS), which is best known as an TLR4 agonist, on CP-induced tolerance. BALB/c (H-2(d)) mice received a conditioning regimen consisting of 10(8) donor DBA/2 (H-2(d)) spleen cells (SC) on day 0 and 200 mg/kg CP on day 2. A single dose of 20 microg LPS was injected on day -2, 0, 7, or 35. Our results showed that LPS infusion at any time point resulted in chronic rejection of donor skin grafts and the abrogation of mixed chimerism in 33-60% of recipients. We found a correlation between skin graft acceptance and higher levels of mixed chimerism. Flow cytometric analysis revealed that donor-reactive T cells were permanently eliminated, regardless of LPS infusion. In conclusion, LPS-infusion had little influence on the immune response of donor-reactive T cells, but had a significant effect on the induction and maintenance of mixed chimerism in CP-induced tolerance.
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Affiliation(s)
- T Onzuka
- Department of Cardiovascular Surgery, Faculty of Medicine, Kyushu University, Higashi-ku, Fukuoka, Japan
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Shimizu I, Miyauchi M, Yamazoe H, Yamane H, Yoshikawa T, Tsuzuki Y, Morie T, Yoshida N. 192 IDENTIFICATION AND CHARACTERIZATION OF DSR‐18424, A NOVEL SELECTIVE TRPV1 AGONIST. Eur J Pain 2009. [DOI: 10.1016/s1090-3801(09)60195-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- I. Shimizu
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - M. Miyauchi
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - H. Yamazoe
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - H. Yamane
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - T. Yoshikawa
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - Y. Tsuzuki
- Chemistry Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - T. Morie
- Chemistry Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
| | - N. Yoshida
- Pharmacology Research Laboratories, Dainippon Sumitomo Pharma CO., LTD., Suita, Osaka, Japan
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Katakami N, Sakamoto K, Kaneto H, Matsuhisa M, Shimizu I, Ishibashi F, Osonoi T, Kashiwagi A, Kawamori R, Hori M, Yamasaki Y. Combined effect of oxidative stress-related gene polymorphisms on atherosclerosis. Biochem Biophys Res Commun 2009; 379:861-5. [PMID: 19126404 DOI: 10.1016/j.bbrc.2008.12.154] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Accepted: 12/22/2008] [Indexed: 11/18/2022]
Abstract
It is well known that oxidative stress plays critical roles in the pathogenesis of atherosclerosis. In this study, we enrolled 1746 type 2 diabetic subjects, determined 4 common genetic variants related to oxidative stress (glutamate-cysteine ligase modifier subunit (GCLM) C-588T, myeloperoxidase G-463A, human paraoxonase 1 Gln192Arg and NAD(P)H oxidase p22phox C242T polymorphisms), and measured carotid intima-media thickness (IMT) as a surrogate marker for atherosclerosis. GCLM C-588T polymorphism was associated with average IMT (AveIMT) (r=0.090, p=0.0008), but the association between the other 3 polymorphisms and AveIMT did not reach the statistical significance. However, AveIMT was significantly greater as the total number of 4 concomitant "pro-oxidant alleles" in each subject was increased (r=0.108, p<0.0001). Furthermore, the number of "pro-oxidant alleles" was a risk factor for a high AveIMT independently of conventional risk factors (p=0.0003). In conclusion, accumulation of oxidative stress-associated alleles was associated with carotid atherosclerosis in type 2 diabetic patients.
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Affiliation(s)
- N Katakami
- Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita City, Osaka 565-0871, Japan.
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Shimizu I, Tomita Y, Onzuka T, Tominaga R. INDUCTION OF THE DONOR MIXED CHIMERISM AND TOLERANCE MEDIATED BY THE IMMATURE PHENOTYPE OF DONOR BONE MARROW DERIVED DENDRITIC CELLS. Transplantation 2008. [DOI: 10.1097/01.tp.0000330571.74966.ee] [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: 11/25/2022]
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Abe S, Ebihara T, Enomoto S, Furuno K, Gando Y, Ichimura K, Ikeda H, Inoue K, Kibe Y, Kishimoto Y, Koga M, Kozlov A, Minekawa Y, Mitsui T, Nakajima K, Nakajima K, Nakamura K, Nakamura M, Owada K, Shimizu I, Shimizu Y, Shirai J, Suekane F, Suzuki A, Takemoto Y, Tamae K, Terashima A, Watanabe H, Yonezawa E, Yoshida S, Busenitz J, Classen T, Grant C, Keefer G, Leonard DS, McKee D, Piepke A, Decowski MP, Detwiler JA, Freedman SJ, Fujikawa BK, Gray F, Guardincerri E, Hsu L, Kadel R, Lendvai C, Luk KB, Murayama H, O'Donnell T, Steiner HM, Winslow LA, Dwyer DA, Jillings C, Mauger C, McKeown RD, Vogel P, Zhang C, Berger BE, Lane CE, Maricic J, Miletic T, Batygov M, Learned JG, Matsuno S, Pakvasa S, Foster J, Horton-Smith GA, Tang A, Dazeley S, Downum KE, Gratta G, Tolich K, Bugg W, Efremenko Y, Kamyshkov Y, Perevozchikov O, Karwowski HJ, Markoff DM, Tornow W, Heeger KM, Piquemal F, Ricol JS. Precision measurement of neutrino oscillation parameters with KamLAND. Phys Rev Lett 2008; 100:221803. [PMID: 18643415 DOI: 10.1103/physrevlett.100.221803] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2008] [Indexed: 05/26/2023]
Abstract
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44 x 10(32) proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor nu[over]e energy spectrum is now rejected at >5sigma. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Deltam21(2)=7.58(-0.13)(+0.14)(stat) -0.15+0.15(syst) x 10(-5) eV2 and tan2theta12=0.56(-0.07)+0.10(stat) -0.06+0.10(syst). Local Deltachi2 minima at higher and lower Deltam21(2) are disfavored at >4sigma. Combining with solar neutrino data, we obtain Deltam21(2)=7.59(-0.21)+0.21 x 10(-5) eV2 and tan2theta12=0.47(-0.05)+0.06.
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Affiliation(s)
- S Abe
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
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Murase Y, Imagawa A, Hanafusa T, Iwahashi H, Uchigata Y, Kanatsuka A, Kawasaki E, Kobayashi T, Shimada A, Shimizu I, Maruyama T, Makino H. Fulminant type 1 diabetes as a high risk group for diabetic microangiopathy--a nationwide 5-year-study in Japan. Diabetologia 2007; 50:531-7. [PMID: 17235525 DOI: 10.1007/s00125-006-0575-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Accepted: 11/23/2006] [Indexed: 11/29/2022]
Abstract
AIMS/HYPOTHESIS The aim of the present study was to assess the development of microangiopathy in patients with fulminant type 1 diabetes, a novel subtype of type 1B diabetes. MATERIALS AND METHODS In a nationwide survey, we followed 41 patients with fulminant type 1 diabetes and 76 age- and sex-matched patients with type 1A diabetes for 5 years. The following data were recorded every 12 months after the onset of diabetes: seven-point blood glucose concentrations, HbA1c level, urinary albumin excretion, serum C-peptide level, blood pressure, daily dosages of insulin, frequency of severe hypoglycaemic episodes, and neurological and fundoscopic examination. RESULTS The 5-year cumulative incidence of microangiopathy was 24.4% in fulminant type 1 diabetes and 2.6% in type 1A diabetes. In longitudinal studies using the Kaplan-Meier method, the cumulative incidence of each form of microangiopathy was significantly higher in fulminant type 1 diabetes than in type 1A diabetes; retinopathy was 9.8% vs 0% (p=0.014), nephropathy 12.2% vs 2.6% (p=0.015) and neuropathy 12.2% vs 1.3% (p=0.010), respectively. Mean HbA1c levels were similar in the fulminant and type 1A diabetes groups during the follow-up periods. However, the mean M-value, mean insulin dosages and the frequency of severe hypoglycaemic episodes were significantly higher, and the mean postprandial C-peptide level was significantly lower in the fulminant type 1 diabetes group. CONCLUSIONS/INTERPRETATION These data suggest that patients with fulminant type 1 diabetes are a high-risk subgroup for diabetic microangiopathy associated with the lack of endogenous insulin secretion from the onset of diabetes.
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Affiliation(s)
- Y Murase
- First Department of Internal Medicine, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki, and Department of Metabolism/Diabetes and Clinical Nutrition, Nagasaki University Hospital of Medicine and Dentistry, Japan
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Tomita Y, Shimizu I, Iwai T, Zhang QW, Okano S, Kajiwara T, Onzuka T, Tominaga R. Application of chimerism-based drug-induced tolerance to rat into mouse xenotransplantation. Scand J Immunol 2006; 64:392-7. [PMID: 16970680 DOI: 10.1111/j.1365-3083.2006.01831.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The current critical shortage of human donor organs has stimulated the feasibility of the xenogenic transplantation, such as swine to primate. We have previously reported the induction of donor-specific tolerance in MHC-disparated recipient mice by using our cyclophosphamide (CP)-induced tolerance conditioning. In this study, we examined the efficacy of our CP-induced tolerance conditioning in xenogenic transplantation model. F344 rats and B10 mice were used as donors and recipients. Recipient mice were treated with donor spleen cells, CP, Busulfan and bone marrow cells, with or without prior NK-cell depletion. Donor mixed chimerism, and the presence of donor reactive T-cell population were analysed by flow cytometry. The survival of the donor skin grafts were observed after the conditioning. Donor mixed chimerism was temporary induced but terminated at 10 weeks after treatments. Donor-specific prolongation of the skin graft survival was observed after the treatments, however, grafts were rejected in the long term. NK-cell depletion, prior to the treatments, did not affect the levels of the mixed chimerism or graft prolongation. The donor-reactive recipient T-cell population was remained the same level as the untreated mice, suggesting the failure of the induction of the central T-cell tolerance. Thus, partial efficacy of our CP-induced tolerance treatments in the rat to mice xenotransplantation was observed. Our results suggested that the additional treatments were required to establish the stable xenogenic tolerance.
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Affiliation(s)
- Y Tomita
- Department of Cardiovascular Surgery, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
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Araki T, Enomoto S, Furuno K, Gando Y, Ichimura K, Ikeda H, Inoue K, Kishimoto Y, Koga M, Koseki Y, Maeda T, Mitsui T, Motoki M, Nakajima K, Nakamura K, Ogawa H, Ogawa M, Owada K, Ricol JS, Shimizu I, Shirai J, Suekane F, Suzuki A, Tada K, Takeuchi S, Tamae K, Tsuda Y, Watanabe H, Busenitz J, Classen T, Djurcic Z, Keefer G, Leonard DS, Piepke A, Yakushev E, Berger BE, Chan YD, Decowski MP, Dwyer DA, Freedman SJ, Fujikawa BK, Goldman J, Gray F, Heeger KM, Hsu L, Lesko KT, Luk KB, Murayama H, O'Donnell T, Poon AWP, Steiner HM, Winslow LA, Jillings C, Mauger C, McKeown RD, Vogel P, Zhang C, Lane CE, Miletic T, Guillian G, Learned JG, Maricic J, Matsuno S, Pakvasa S, Horton-Smith GA, Dazeley S, Hatakeyama S, Rojas A, Svoboda R, Dieterle BD, Detwiler J, Gratta G, Ishii K, Tolich N, Uchida Y, Batygov M, Bugg W, Efremenko Y, Kamyshkov Y, Kozlov A, Nakamura Y, Karwowski HJ, Markoff DM, Rohm RM, Tornow W, Wendell R, Chen MJ, Wang YF, Piquemal F. Search for the invisible decay of neutrons with KamLAND. Phys Rev Lett 2006; 96:101802. [PMID: 16605724 DOI: 10.1103/physrevlett.96.101802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Indexed: 05/08/2023]
Abstract
The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the -shell energy level of (12)C nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n--> 3v or nn--> 2v. The deexcitation of the corresponding daughter nucleus results in a sequence of space and time-correlated events observable in the liquid scintillator detector. We report on new limits for one- and two-neutron disappearance: tau(n--> inv) > 5.8 x 10(29) years and tau (nn--> inv) > 1.4 x 10(30) years at 90% C.L. These results represent an improvement of factors of approximately 3 and >10(4) and over previous experiments.
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Affiliation(s)
- T Araki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
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Shimizu I, Makino H, Imagawa A, Iwahashi H, Uchigata Y, Kanatsuka A, Kawasaki E, Kobayashi T, Shimada A, Maruyama T, Hanafusa T. Clinical and immunogenetic characteristics of fulminant type 1 diabetes associated with pregnancy. J Clin Endocrinol Metab 2006; 91:471-6. [PMID: 16278271 DOI: 10.1210/jc.2005-1943] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The objective of this study was to characterize the clinical and immunogenetic features of Japanese pregnancy-associated fulminant type 1 diabetes (PF). A group of patients with PF was compared with a group of patients of child-bearing age with fulminant type 1 diabetes that was not associated with pregnancy (NPF) in a nationwide survey conducted from 2000-2004. PATIENTS The clinical characteristics of the 22 patients in the PF group were compared with those of the 48 patients in the NPF group. Human leukocyte antigen (HLA) class II DR and DQ genotyping of 17 PF and 20 NPF patients was performed. RESULTS Arterial pH was significantly lower (P = 0.0366), and amylase values tended to increase in PF patients compared with NPF patients (P = 0.0515). In 22 PF patients, 18 developed disease during pregnancy (26.3 wk; range, 7-38), whereas four cases occurred immediately after delivery (10.5 d; range, 7-14 d). Twelve cases that developed during pregnancy resulted in stillbirth (67%), and five of the six fetal cases that survived were delivered by cesarean section. The haplotype frequency of HLA DRB1*0901-DQB1*0303 in PF was significantly higher than those in NPF (P = 0.0244) and controls (P = 0.0001), whereas that of DRB1*0405-DQB1*0401 in NPF was significantly higher than those in PF (P = 0.0162) and controls (P < 0.0001). CONCLUSIONS The clinical symptoms of PF patients were more severe than those of NPF patients, and the prognosis of their fetuses was extremely poor. The type 1 diabetes-susceptible HLA class II haplotype is distinct in PF and NPF patients, suggesting that different HLA haplotypes underlie the presentation of PF or NPF.
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Affiliation(s)
- I Shimizu
- Department of Internal Medicine, Ehime Prefectural Imabari Hospital, Imabari 794-0006, Japan
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Itagaki T, Shimizu I, Cheng X, Yuan Y, Oshio A, Tamaki K, Fukuno H, Honda H, Okamura Y, Ito S. Opposing effects of oestradiol and progesterone on intracellular pathways and activation processes in the oxidative stress induced activation of cultured rat hepatic stellate cells. Gut 2005; 54:1782-9. [PMID: 16284289 PMCID: PMC1774809 DOI: 10.1136/gut.2005.053278] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Oxidative stress, including the generation of reactive oxygen species (ROS), is involved in hepatofibrogenesis. The authors' previous studies have shown that oestradiol suppresses hepatic fibrosis in animal models and attenuates the activation of cultured rat hepatic stellate cells (HSCs), which possess oestrogen receptor subtype beta and are also activated by ROS. AIMS To define the mechanisms by which female sex hormones play an antifibrogenic role in activated HSCs, the effects of oestradiol and progesterone on ROS generation processes and intracellular pathways, leading to the activation of HSCs undergoing oxidative stress, was examined. METHODS HSCs, isolated from rats, were cultured for 7 days with oestradiol or progesterone for 24 hours as pretreatment, and oxidative stress was then induced by exposure to low doses of hydrogen peroxide for another 24 hours. RESULTS Oestradiol inhibited ROS generation and antioxidant enzyme loss via the suppression of NADH/NADPH oxidase activity, and attenuated hydrogen peroxide induced transforming growth factor-beta1 (TGF-beta1) expression, HSC proliferation and transformation, and the activation of mitogen activated protein kinase (MAPK) pathways and transcription factors. Progesterone exerted a stimulatory effect through the progesterone receptor on the induction of ROS generation processes and intracellular pathways, resulting in TGF-beta1 expression and HSC activation, and fibrogenic effects were inhibited by oestradiol. CONCLUSION These findings show for the first time that oestradiol inhibits the activation of transcription factors by suppressing ROS generation processes and the MAPK pathways, and inactivates the downstream transcription processes involved in TGF-beta1 expression and HSC activation, whereas progesterone acts in opposition to the favourable effects of oestradiol and its effects are blocked by oestradiol.
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Affiliation(s)
- T Itagaki
- Department of Digestive and Cardiovascular Medicine, Tokushima University Graduate School, Kuramoto-cho, Tokushima 770-8503, Japan
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Abstract
Mixed hematopoietic chimerism induced via nonmyeloablative bone marrow transplantation (BMT) leads to unresponsiveness of anti-Gal alpha1,3Gal beta1,4G1cNAc (Gal) natural antibody (NAb)-producing cells in alpha1,3-galactosyltransferase deficient (GalT(-/-)) mice. We analyzed the mechanisms of anti-Gal-producing B cell unresponsiveness induced by Gal(+/+) BMT. C57BL/6 (B6) GalT(-/-) mice received 3Gy whole-body irradiation and BMT from B6-CD45 congenic mice. BMT led to marked reductions in serum anti-Gal IgM levels and in the numbers of splenic anti-Gal-producing cells by 2 weeks post-BMT. B cells with anti-Gal Ig receptors were present in the spleens of 2-week but not 12-week chimeras. In vitro studies and adoptive transfer studies using B6 GalT(-/-)B cell-deficient recipients showed that B cell hyporesponsiveness to Gal at 2 weeks, but not 12 weeks, depended on persistent Gal antigen. Thus, pre-existing B-1 cells are anergic when there is continuous exposure to Gal, whereas long-term unresponsiveness does not require persistent antigen, implicating clonal deletion and/or receptor editing. These results have implications for the potential use of mixed hematopioetic chimerism as an approach to performing organ transplantation in recipients with pre-existing anti-donor IgM antibodies.
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Affiliation(s)
- T Kawahara
- Transplantation Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
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Itagaki T, Shimizu I, Cheng X, Yuan Y, Oshio A, Tamaki K, Fukuno H, Honda H, Okamura Y, Ito S. Opposing effects of oestradiol and progesterone on intracellular pathways and activation processes in the oxidative stress induced activation of cultured rat hepatic stellate cells. Gut 2005. [PMID: 16284289 DOI: 10.1136/gut.2004.053728] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.2] [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: 12/13/2022]
Abstract
BACKGROUND Oxidative stress, including the generation of reactive oxygen species (ROS), is involved in hepatofibrogenesis. The authors' previous studies have shown that oestradiol suppresses hepatic fibrosis in animal models and attenuates the activation of cultured rat hepatic stellate cells (HSCs), which possess oestrogen receptor subtype beta and are also activated by ROS. AIMS To define the mechanisms by which female sex hormones play an antifibrogenic role in activated HSCs, the effects of oestradiol and progesterone on ROS generation processes and intracellular pathways, leading to the activation of HSCs undergoing oxidative stress, was examined. METHODS HSCs, isolated from rats, were cultured for 7 days with oestradiol or progesterone for 24 hours as pretreatment, and oxidative stress was then induced by exposure to low doses of hydrogen peroxide for another 24 hours. RESULTS Oestradiol inhibited ROS generation and antioxidant enzyme loss via the suppression of NADH/NADPH oxidase activity, and attenuated hydrogen peroxide induced transforming growth factor-beta1 (TGF-beta1) expression, HSC proliferation and transformation, and the activation of mitogen activated protein kinase (MAPK) pathways and transcription factors. Progesterone exerted a stimulatory effect through the progesterone receptor on the induction of ROS generation processes and intracellular pathways, resulting in TGF-beta1 expression and HSC activation, and fibrogenic effects were inhibited by oestradiol. CONCLUSION These findings show for the first time that oestradiol inhibits the activation of transcription factors by suppressing ROS generation processes and the MAPK pathways, and inactivates the downstream transcription processes involved in TGF-beta1 expression and HSC activation, whereas progesterone acts in opposition to the favourable effects of oestradiol and its effects are blocked by oestradiol.
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Affiliation(s)
- T Itagaki
- Department of Digestive and Cardiovascular Medicine, Tokushima University Graduate School, Kuramoto-cho, Tokushima 770-8503, Japan
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Shimizu I, Tomita Y, Iwai T, Kajiwara T, Okano S, Sueishi K, Nomoto K, Yasui H. Efficacy and limitations of cyclophosphamide-induced tolerance against alphaGal antigen. Scand J Immunol 2005; 62:271-80. [PMID: 16179014 DOI: 10.1111/j.1365-3083.2005.01644.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the present study, we have elucidated the efficacy of two cyclophosphamide (CP)-induced tolerance protocols for the induction of B-cell tolerance against Galalpha1-3Galbeta1-4GlcNAc (alphaGal) antigens. alpha1,3-galactosyltransferase-deficient (GalT-/-; H-2(b/d)) mice received with 1 x 10(8) AKR (alphaGal+/+ H-2k) spleen cells (SC) followed by 200 mg/kg CP, or alternatively followed by 200 mg/kg CP, 30 mg/kg Busulfan (BU) and 1 x 10(8) T-cell-depleted AKR bone marrow cells (BMC). The generation of both anti-alphaGal and anti-donor antibodies were completely suppressed, but normal antibody production against third party antigens was observed after BALB/c skin grafting in both groups of GalT-/- mice. In GalT-/- mice, treated with SC and CP, mixed chimerism was not observed. Cellular rejection was observed in grafted donor AKR hearts with an absence of humoral rejection, whereas humoral rejection was observed in untreated GalT-/- mice. On the other hand, long-term mixed chimerism and permanent acceptance of donor AKR skin graft and heart graft were achieved in GalT-/- mice treated with SC, CP, BU and BMC. These results demonstrate the efficacy of classical drug-induced tolerance in the induction of B-cell tolerance against alphaGal antigens. However, induction of stable mixed chimerism was required for the suppression of cellular rejection.
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Affiliation(s)
- I Shimizu
- Department of Cardiovascular Surgery, Faculty of Medicine, Kyushu Institute of Bioregulation, Kyushu University, Fukuoka, Japan
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Araki T, Enomoto S, Furuno K, Gando Y, Ichimura K, Ikeda H, Inoue K, Kishimoto Y, Koga M, Koseki Y, Maeda T, Mitsui T, Motoki M, Nakajima K, Ogawa H, Ogawa M, Owada K, Ricol JS, Shimizu I, Shirai J, Suekane F, Suzuki A, Tada K, Takeuchi S, Tamae K, Tsuda Y, Watanabe H, Busenitz J, Classen T, Djurcic Z, Keefer G, Leonard D, Piepke A, Yakushev E, Berger BE, Chan YD, Decowski MP, Dwyer DA, Freedman SJ, Fujikawa BK, Goldman J, Gray F, Heeger KM, Hsu L, Lesko KT, Luk KB, Murayama H, O'Donnell T, Poon AWP, Steiner HM, Winslow LA, Mauger C, McKeown RD, Vogel P, Lane CE, Miletic T, Guillian G, Learned JG, Maricic J, Matsuno S, Pakvasa S, Horton-Smith GA, Dazeley S, Hatakeyama S, Rojas A, Svoboda R, Dieterle BD, Detwiler J, Gratta G, Ishii K, Tolich N, Uchida Y, Batygov M, Bugg W, Efremenko Y, Kamyshkov Y, Kozlov A, Nakamura Y, Karwowski HJ, Markoff DM, Nakamura K, Rohm RM, Tornow W, Wendell R, Chen MJ, Wang YF, Piquemal F. Experimental investigation of geologically produced antineutrinos with KamLAND. Nature 2005; 436:499-503. [PMID: 16049478 DOI: 10.1038/nature03980] [Citation(s) in RCA: 296] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2005] [Accepted: 07/04/2005] [Indexed: 11/09/2022]
Abstract
The detection of electron antineutrinos produced by natural radioactivity in the Earth could yield important geophysical information. The Kamioka liquid scintillator antineutrino detector (KamLAND) has the sensitivity to detect electron antineutrinos produced by the decay of 238U and 232Th within the Earth. Earth composition models suggest that the radiogenic power from these isotope decays is 16 TW, approximately half of the total measured heat dissipation rate from the Earth. Here we present results from a search for geoneutrinos with KamLAND. Assuming a Th/U mass concentration ratio of 3.9, the 90 per cent confidence interval for the total number of geoneutrinos detected is 4.5 to 54.2. This result is consistent with the central value of 19 predicted by geophysical models. Although our present data have limited statistical power, they nevertheless provide by direct means an upper limit (60 TW) for the radiogenic power of U and Th in the Earth, a quantity that is currently poorly constrained.
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Affiliation(s)
- T Araki
- Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan
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