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Morooka N, Gui N, Ando K, Sako K, Fukumoto M, Hasegawa U, Hußmann M, Schulte-Merker S, Mochizuki N, Nakajima H. Angpt1 binding to Tie1 regulates the signaling required for lymphatic vessel development in zebrafish. Development 2024:dev.202269. [PMID: 38742432 DOI: 10.1242/dev.202269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 04/26/2024] [Indexed: 05/16/2024]
Abstract
Development of the vascular system is regulated by multiple signaling pathways mediated by receptor tyrosine kinases (RTKs). Among them, angiopoietin (Ang)/Tie signaling regulates lymphatic and blood vessel development in mammals. Of the two Tie receptors, Tie2 is well known as a key mediator of Ang/Tie signaling, but unexpectedly, recent studies reveal that the Tie2 locus has been lost in many vertebrate species, while the Tie1 gene is more commonly present. However, Tie1-driven signaling pathways, including ligands and cellular functions, are not well understood. Here, we performed comprehensive mutant analyses of angiopoietins and Tie receptors in zebrafish and found that only angpt1 and tie1 mutants show defects in trunk lymphatic vessel development. Among zebrafish angiopoietins, only Angpt1 binds to Tie1 as a ligand. We indirectly monitored Ang1/Tie1 signaling and detected Tie1 activation in sprouting endothelial cells (ECs), where Tie1 inhibits nuclear import of EGFP-Foxo1a. Angpt1/Tie1 signaling functions in EC migration, proliferation, and lymphatic specification during early lymphangiogenesis, at least in part by modulating Vegfc/Vegfr3 signaling. Thus, we show Angpt1/Tie1 signaling to constitute an essential signaling pathway for lymphatic development in zebrafish.
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Affiliation(s)
- Nanami Morooka
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
- Department of Medical Physiology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Ning Gui
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Koji Ando
- Department of Cardiac Regeneration Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Keisuke Sako
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Moe Fukumoto
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Urara Hasegawa
- Department of Materials Science and Engineering, The Pennsylvania State University, Steidle Building, University Park, Pennsylvania 16802, USA
| | - Melina Hußmann
- Institute of Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WU Münster, 48149 Münster, Germany
| | - Stefan Schulte-Merker
- Institute of Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WU Münster, 48149 Münster, Germany
| | - Naoki Mochizuki
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Hiroyuki Nakajima
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
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2
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Tran TAT, Iwata Y, Hoang LT, Kitajima S, Yoneda-Nakagawa S, Oshima M, Sakai N, Toyama T, Yamamura Y, Yamazaki H, Hara A, Shimizu M, Sako K, Minami T, Yuasa T, Horikoshi K, Hayashi D, Kajikawa S, Wada T. Protective Role of MAVS Signaling for Murine Lipopolysaccharide-Induced Acute Kidney Injury. Immunohorizons 2024; 8:1-18. [PMID: 38169549 PMCID: PMC10835654 DOI: 10.4049/immunohorizons.2300069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 11/14/2023] [Indexed: 01/05/2024] Open
Abstract
Despite treatment advances, acute kidney injury (AKI)-related mortality rates are still high in hospitalized adults, often due to sepsis. Sepsis and AKI could synergistically worsen the outcomes of critically ill patients. TLR4 signaling and mitochondrial antiviral signaling protein (MAVS) signaling are innate immune responses essential in kidney diseases, but their involvement in sepsis-associated AKI (SA-AKI) remains unclear. We studied the role of MAVS in kidney injury related to the TLR4 signaling pathway using a murine LPS-induced AKI model in wild-type and MAVS-knockout mice. We confirmed the importance of M1 macrophage in SA-AKI through in vivo assessment of inflammatory responses. The TLR4 signaling pathway was upregulated in activated bone marrow-derived macrophages, in which MAVS helped maintain the LPS-suppressed TLR4 mRNA level. MAVS regulated redox homeostasis via NADPH oxidase Nox2 and mitochondrial reverse electron transport in macrophages to alleviate the TLR4 signaling response to LPS. Hypoxia-inducible factor 1α (HIF-1α) and AP-1 were key regulators of TLR4 transcription and connected MAVS-dependent reactive oxygen species signaling with the TLR4 pathway. Inhibition of succinate dehydrogenase could partly reduce inflammation in LPS-treated bone marrow-derived macrophages without MAVS. These findings highlight the renoprotective role of MAVS in LPS-induced AKI by regulating reactive oxygen species generation-related genes and maintaining redox balance. Controlling redox homeostasis through MAVS signaling may be a promising therapy for SA-AKI.
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Affiliation(s)
- Trang Anh Thi Tran
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Yasunori Iwata
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
- Division of Infection Control, Kanazawa University Hospital, Kanazawa, Japan
| | - Linh Thuy Hoang
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Shinji Kitajima
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
- Division of Blood Purification, Kanazawa University Hospital, Kanazawa, Japan
| | | | - Megumi Oshima
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Norihiko Sakai
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
- Division of Blood Purification, Kanazawa University Hospital, Kanazawa, Japan
| | - Tadashi Toyama
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Yuta Yamamura
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Hiroka Yamazaki
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Akinori Hara
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Miho Shimizu
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Keisuke Sako
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Taichiro Minami
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Takahiro Yuasa
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Keisuke Horikoshi
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Daiki Hayashi
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Sho Kajikawa
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
| | - Takashi Wada
- Department of Nephrology and Rheumatology, Kanazawa University, Kanazawa, Japan
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3
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Nakajima H, Ishikawa H, Yamamoto T, Chiba A, Fukui H, Sako K, Fukumoto M, Mattonet K, Kwon HB, Hui SP, Dobreva GD, Kikuchi K, Helker CSM, Stainier DYR, Mochizuki N. Endoderm-derived islet1-expressing cells differentiate into endothelial cells to function as the vascular HSPC niche in zebrafish. Dev Cell 2023; 58:224-238.e7. [PMID: 36693371 DOI: 10.1016/j.devcel.2022.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 10/26/2022] [Accepted: 12/29/2022] [Indexed: 01/25/2023]
Abstract
Endothelial cells (ECs) line blood vessels and serve as a niche for hematopoietic stem and progenitor cells (HSPCs). Recent data point to tissue-specific EC specialization as well as heterogeneity; however, it remains unclear how ECs acquire these properties. Here, by combining live-imaging-based lineage-tracing and single-cell transcriptomics in zebrafish embryos, we identify an unexpected origin for part of the vascular HSPC niche. We find that islet1 (isl1)-expressing cells are the progenitors of the venous ECs that constitute the majority of the HSPC niche. These isl1-expressing cells surprisingly originate from the endoderm and differentiate into ECs in a process dependent on Bmp-Smad signaling and subsequently requiring npas4l (cloche) function. Single-cell RNA sequencing analyses show that isl1-derived ECs express a set of genes that reflect their distinct origin. This study demonstrates that endothelial specialization in the HSPC niche is determined at least in part by the origin of the ECs.
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Affiliation(s)
- Hiroyuki Nakajima
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan.
| | - Hiroyuki Ishikawa
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Takuya Yamamoto
- Department of Life Science Frontiers, Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan; Institute for the Advanced Study of Human Biology (WPI-ASHBi), Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan; AMED-CREST, AMED, Tokyo 100-0004, Japan; Medical-risk Avoidance based on iPS Cells Team, RIKEN Center for Advanced Intelligence Project (AIP), Kyoto 606-8507, Japan
| | - Ayano Chiba
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Hajime Fukui
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Keisuke Sako
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Moe Fukumoto
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Kenny Mattonet
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim 61231, Germany
| | - Hyouk-Bum Kwon
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim 61231, Germany; Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Subhra P Hui
- S. N. Pradhan Centre for Neurosciences, University of Calcutta, Kolkata 700019, India
| | - Gergana D Dobreva
- Department of Cardiovascular Genomics and Epigenomics, European Center for Angioscience (ECAS), Medical Faculty Mannheim, Heidelberg University, Mannheim 68167, Germany
| | - Kazu Kikuchi
- Department of Cardiac Regeneration Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan
| | - Christian S M Helker
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim 61231, Germany; Philipps-University Marburg, Faculty of Biology, Cell Signaling and Dynamics, Marburg 35043, Germany
| | - Didier Y R Stainier
- Department of Developmental Genetics, Max Planck Institute for Heart and Lung Research, Bad Nauheim 61231, Germany.
| | - Naoki Mochizuki
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka 564-8565, Japan.
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4
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Sako K, Furuichi K, Makiishi S, Yamamura Y, Okumura T, Le T, Kitajima S, Toyama T, Hara A, Iwata Y, Sakai N, Shimizu M, Niimura F, Matsusaka T, Kaneko S, Wada T. Cyclin-dependent kinase 4-related tubular epithelial cell proliferation is regulated by Paired box gene 2 in kidney ischemia-reperfusion injury. Kidney Int 2022; 102:45-57. [PMID: 35483529 DOI: 10.1016/j.kint.2022.03.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 02/08/2022] [Accepted: 03/09/2022] [Indexed: 12/20/2022]
Abstract
Paired box 2 (Pax2) is a transcription factor essential for kidney development and is reactivated in proximal tubular epithelial cells (PTECs) during recovery from kidney injury. However, the role of Pax2 in this process is still unknown. Here the role of Pax2 reactivation during injury was examined in the proliferation of PTECs using an ischemia-reperfusion injury (IRI) mouse model. Kidney proximal tubule-specific Pax2 conditional knockout mice were generated by mating kidney androgen-regulated protein-Cre and Pax2 flox mice. The degree of cell proliferation and fibrosis was assessed and a Pax2 inhibitor (EG1) was used to evaluate the role of Pax2 in the hypoxic condition of cultured PTECs (O2 5%, 24 hours). The number of Pax2-positive cells and Pax2 mRNA increased after IRI. Sirius red staining indicated that the area of interstitial fibrosis was significantly larger in knockout mice 14 days after IRI. The number of Ki-67-positive cells (an index of proliferation) was significantly lower in knockout than in wild-type mice after IRI, whereas the number of TUNEL-positive cells (an index of apoptotic cells) was significantly higher in knockout mice four days after IRI. Expression analyses of cell cycle-related genes showed that cyclin-dependent kinase 4 (CDK4) was significantly less expressed in the Pax2 knockout mice. In vitro data showed that the increase in CDK4 mRNA and protein expression induced by hypoxia was attenuated by EG1. Thus, Pax2 reactivation may be involved in PTEC proliferation by activating CDK4, thereby limiting kidney fibrosis.
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Affiliation(s)
- Keisuke Sako
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Kengo Furuichi
- Department of Nephrology, School of Medicine, Kanazawa Medical University, Uchinada, Ishikawa, Japan
| | - Shohei Makiishi
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Yuta Yamamura
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Toshiya Okumura
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Thu Le
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Shinji Kitajima
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Tadashi Toyama
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Akinori Hara
- Department of Environmental and Preventive Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Yasunori Iwata
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan; Division of Infection Control, Kanazawa University, Kanazawa, Japan
| | - Norihiko Sakai
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Miho Shimizu
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Fumio Niimura
- Department of Pediatrics, School of Medicine, Tokai University, Isehara, Japan
| | - Taiji Matsusaka
- Department of Basic Medicine, School of Medicine, Tokai University, Isehara, Japan; Institute of Medical Science, Tokai University, Isehara, Japan
| | - Shuichi Kaneko
- Department of System Biology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Takashi Wada
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan.
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5
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Mori Y, Fink C, Ichimura T, Sako K, Mori M, Lee NN, Aschauer P, Padmanabha Das KM, Hong S, Song M, Padera RF, Weins A, Lee LP, Nasr ML, Dekaban GA, Dikeakos JD, Bonventre JV. KIM-1/TIM-1 is a Receptor for SARS-CoV-2 in Lung and Kidney. medRxiv 2022:2020.09.16.20190694. [PMID: 32995803 PMCID: PMC7523142 DOI: 10.1101/2020.09.16.20190694] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
SARS-CoV-2 precipitates respiratory distress by infection of airway epithelial cells and is often accompanied by acute kidney injury. We report that Kidney Injury Molecule-1/T cell immunoglobulin mucin domain 1 (KIM-1/TIM-1) is expressed in lung and kidney epithelial cells in COVID-19 patients and is a receptor for SARS-CoV-2. Human and mouse lung and kidney epithelial cells express KIM-1 and endocytose nanoparticles displaying the SARS-CoV-2 spike protein (virosomes). Uptake was inhibited by anti-KIM-1 antibodies and TW-37, a newly discovered inhibitor of KIM-1-mediated endocytosis. Enhanced KIM-1 expression by human kidney tubuloids increased uptake of virosomes. KIM-1 binds to the SARS-CoV-2 Spike protein in vitro . KIM-1 expressing cells, not expressing angiotensin-converting enzyme 2 (ACE2), are permissive to SARS-CoV-2 infection. Thus, KIM-1 is an alternative receptor to ACE2 for SARS-CoV-2. KIM-1 targeted therapeutics may prevent and/or treat COVID-19.
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6
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Tsujita K, Satow R, Asada S, Nakamura Y, Arnes L, Sako K, Fujita Y, Fukami K, Itoh T. Homeostatic membrane tension constrains cancer cell dissemination by counteracting BAR protein assembly. Nat Commun 2021; 12:5930. [PMID: 34635648 PMCID: PMC8505629 DOI: 10.1038/s41467-021-26156-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 09/16/2021] [Indexed: 01/06/2023] Open
Abstract
Malignancy is associated with changes in cell mechanics that contribute to extensive cell deformation required for metastatic dissemination. We hypothesized that the cell-intrinsic physical factors that maintain epithelial cell mechanics could function as tumor suppressors. Here we show, using optical tweezers, genetic interference, mechanical perturbations, and in vivo studies, that epithelial cells maintain higher plasma membrane (PM) tension than their metastatic counterparts and that high PM tension potently inhibits cancer cell migration and invasion by counteracting membrane curvature sensing/generating BAR family proteins. This tensional homeostasis is achieved by membrane-to-cortex attachment (MCA) regulated by ERM proteins, whose disruption spontaneously transforms epithelial cells into a mesenchymal migratory phenotype powered by BAR proteins. Consistently, the forced expression of epithelial–mesenchymal transition (EMT)-inducing transcription factors results in decreased PM tension. In metastatic cells, increasing PM tension by manipulating MCA is sufficient to suppress both mesenchymal and amoeboid 3D migration, tumor invasion, and metastasis by compromising membrane-mediated mechanosignaling by BAR proteins, thereby uncovering a previously undescribed mechanical tumor suppressor mechanism. Changes in cell mechanics contribute to cancer cell dissemination. Here the authors show that high plasma membrane (PM) tension inhibits cancer dissemination by counteracting mechanosensitive BAR family protein assembly, while restoration of PM tension phenotypically convert malignant cells into a non-motile epithelial cell state.
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Affiliation(s)
- Kazuya Tsujita
- Biosignal Research Center, Kobe University, Kobe, Hyogo, 657-8501, Japan. .,Division of Membrane Biology, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Hyogo, 650-0017, Japan. .,AMED-PRIME, Japan Agency for Medical Research and Development, Tokyo, 100-0004, Japan.
| | - Reiko Satow
- Laboratory of Genome and Biosignals, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Shinobu Asada
- Laboratory of Genome and Biosignals, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Yoshikazu Nakamura
- Laboratory of Genome and Biosignals, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan.,Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, 278-8510, Japan
| | - Luis Arnes
- The Novo Nordisk Foundation Center for Stem Cell Biology (DanStem), Biotech Research & Innovation Centre, University of Copenhagen, Copenhagen, Denmark
| | - Keisuke Sako
- National Cerebral and Cardiovascular Center Research Institute, Osaka, 565-8565, Japan
| | - Yasuyuki Fujita
- Division of Molecular Oncology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Kiyoko Fukami
- Laboratory of Genome and Biosignals, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, 192-0392, Japan
| | - Toshiki Itoh
- Biosignal Research Center, Kobe University, Kobe, Hyogo, 657-8501, Japan.,Division of Membrane Biology, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Hyogo, 650-0017, Japan
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7
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Watanabe-Takano H, Ochi H, Chiba A, Matsuo A, Kanai Y, Fukuhara S, Ito N, Sako K, Miyazaki T, Tainaka K, Harada I, Sato S, Sawada Y, Minamino N, Takeda S, Ueda HR, Yasoda A, Mochizuki N. Mechanical load regulates bone growth via periosteal Osteocrin. Cell Rep 2021; 36:109380. [PMID: 34260913 DOI: 10.1016/j.celrep.2021.109380] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 04/15/2021] [Accepted: 06/21/2021] [Indexed: 12/20/2022] Open
Abstract
Mechanical stimuli including loading after birth promote bone growth. However, little is known about how mechanical force triggers biochemical signals to regulate bone growth. Here, we identified a periosteal-osteoblast-derived secretory peptide, Osteocrin (OSTN), as a mechanotransducer involved in load-induced long bone growth. OSTN produced by periosteal osteoblasts regulates growth plate growth by enhancing C-type natriuretic peptide (CNP)-dependent proliferation and maturation of chondrocytes, leading to elongation of long bones. Additionally, OSTN cooperates with CNP to regulate bone formation. CNP stimulates osteogenic differentiation of periosteal osteoprogenitors to induce bone formation. OSTN binds to natriuretic peptide receptor 3 (NPR3) in periosteal osteoprogenitors, thereby preventing NPR3-mediated clearance of CNP and consequently facilitating CNP-signal-mediated bone growth. Importantly, physiological loading induces Ostn expression in periosteal osteoblasts by suppressing Forkhead box protein O1 (FoxO1) transcription factor. Thus, this study reveals a crucial role of OSTN as a mechanotransducer converting mechanical loading to CNP-dependent bone formation.
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Affiliation(s)
- Haruko Watanabe-Takano
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan.
| | - Hiroki Ochi
- Department of Clinical Research, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa, Saitama 359-8555, Japan
| | - Ayano Chiba
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan
| | - Ayaka Matsuo
- Omics Research Center, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shinmachi, Suita, Osaka 564-8565, Japan
| | - Yugo Kanai
- Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine and Faculty of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shigetomo Fukuhara
- Department of Molecular Pathophysiology, Institute of Advanced Medical Sciences, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8602, Japan
| | - Naoki Ito
- Laboratory of Molecular Life Science, Institute of Biomedical Research and Innovation, Foundation for Biomedical Research and Innovation at Kobe, 6-7-6 Minatojima-Minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Keisuke Sako
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan
| | - Takahiro Miyazaki
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan
| | - Kazuki Tainaka
- Department of System Pathology for Neurological Disorders, Center for Bioresources, Brain Research Institute, Niigata University, 1-757 Asahimachidori, Chuo-ku, Niigata 951-8585, Japan
| | - Ichiro Harada
- Medical Products Technology, Development Center, R&D headquarters, Canon Inc., 3-30-2, Shimomaruko, Ohta-ku, Tokyo 146-8501, Japan
| | - Shingo Sato
- Center for Innovative Cancer Treatment, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan
| | - Yasuhiro Sawada
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan; Department of Clinical Research, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa, Saitama 359-8555, Japan; Department of Rehabilitation for Motor Functions, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa, Saitama 359-8555, Japan
| | - Naoto Minamino
- Omics Research Center, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shinmachi, Suita, Osaka 564-8565, Japan
| | - Shu Takeda
- Division of Endocrinology, Toranomon Hospital Endocrine Center, 2-2-2 Toranomon, Minato-ku, Tokyo 105-8470, Japan
| | - Hiroki R Ueda
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan; Department of Systems Pharmacology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Laboratory for Synthetic Biology, RIKEN Center for Biosystems Dynamics Research, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Akihiro Yasoda
- Clinical Research Center, National Hospital Organization Kyoto Medical Center, 1-1 Fukakusa-Mukaihatacho, Fushimi-ku, Kyoto 612-8555, Japan
| | - Naoki Mochizuki
- Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, 6-1 Kishibe-shimmachi, Suita, Osaka 564-8565, Japan; CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
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8
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Yamamura Y, Furuichi K, Murakawa Y, Hirabayashi S, Yoshihara M, Sako K, Kitajima S, Toyama T, Iwata Y, Sakai N, Hosomichi K, Murphy PM, Tajima A, Okita K, Osafune K, Kaneko S, Wada T. Identification of candidate PAX2-regulated genes implicated in human kidney development. Sci Rep 2021; 11:9123. [PMID: 33907292 PMCID: PMC8079710 DOI: 10.1038/s41598-021-88743-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 04/16/2021] [Indexed: 02/02/2023] Open
Abstract
PAX2 is a transcription factor essential for kidney development and the main causative gene for renal coloboma syndrome (RCS). The mechanisms of PAX2 action during kidney development have been evaluated in mice but not in humans. This is a critical gap in knowledge since important differences have been reported in kidney development in the two species. In the present study, we hypothesized that key human PAX2-dependent kidney development genes are differentially expressed in nephron progenitor cells from induced pluripotent stem cells (iPSCs) in patients with RCS relative to healthy individuals. Cap analysis of gene expression revealed 189 candidate promoters and 71 candidate enhancers that were differentially activated by PAX2 in this system in three patients with RCS with PAX2 mutations. By comparing this list with the list of candidate Pax2-regulated mouse kidney development genes obtained from the Functional Annotation of the Mouse/Mammalian (FANTOM) database, we prioritized 17 genes. Furthermore, we ranked three genes-PBX1, POSTN, and ITGA9-as the top candidates based on closely aligned expression kinetics with PAX2 in the iPSC culture system and susceptibility to suppression by a Pax2 inhibitor in cultured mouse embryonic kidney explants. Identification of these genes may provide important information to clarify the pathogenesis of RCS, human kidney development, and kidney regeneration.
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Affiliation(s)
- Yuta Yamamura
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Kengo Furuichi
- Department of Nephrology, School of Medicine, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa, 920-0293, Japan.
| | - Yasuhiro Murakawa
- RIKEN Preventive Medicine and Diagnosis Innovation Program, Yokohama, Kanagawa, Japan
| | - Shigeki Hirabayashi
- RIKEN Preventive Medicine and Diagnosis Innovation Program, Yokohama, Kanagawa, Japan
| | - Masahito Yoshihara
- Division of Genomic Technologies, RIKEN Center for Life Science Technologies, Yokohama, Kanagawa, Japan
| | - Keisuke Sako
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Shinji Kitajima
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Tadashi Toyama
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Yasunori Iwata
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Norihiko Sakai
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Kazuyoshi Hosomichi
- Department of Bioinformatics and Genomics, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Philip M Murphy
- Molecular Signaling Section, Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Atsushi Tajima
- Department of Bioinformatics and Genomics, Graduate School of Advanced Preventive Medical Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Keisuke Okita
- Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan
| | - Kenji Osafune
- Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan
| | - Shuichi Kaneko
- Department of System Biology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Takashi Wada
- Department of Nephrology and Laboratory Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan.
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9
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Makiishi S, Furuichi K, Yamamura Y, Sako K, Shinozaki Y, Toyama T, Kitajima S, Iwata Y, Sakai N, Shimizu M, Hirose-Sugiura T, Kaneko S, Kato Y, Wada T. Carnitine/organic cation transporter 1 precipitates the progression of interstitial fibrosis through oxidative stress in diabetic nephropathy in mice. Sci Rep 2021; 11:9093. [PMID: 33907247 PMCID: PMC8079701 DOI: 10.1038/s41598-021-88724-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 04/07/2021] [Indexed: 11/08/2022] Open
Abstract
Carnitine/organic cation transporter 1 (OCTN1) is the only known uptake transporter for ergothioneine which is a food-derived strong antioxidant amino acid that is absorbed by OCTN1. We previously reported the roles of OCTN1/ergothioneine in the progression of kidney fibrosis in ischemic kidney disease. In this study, we evaluated the roles of OCTN1 in the progression of diabetic kidney disease. A diabetic kidney disease model was induced in octn1 knockout and wild-type mice by streptozotocin (STZ). Oxidative stress, represented by urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG), were higher in the octn1 knockout mice. Azan- and Sirius red-positive areas increased significantly in the octn1 knockout mice. Gene expression was evaluated by cluster analysis, and shown to be different in the octn1 knockout mice compared with the wild-type mice. In a pathway analysis, the pathway associated with the cytoskeleton and cell adhesion increased. In accordance with interstitial fibrosis in octn1 knockout mice, gene expression of moesin in the injured kidney, known as an associated protein of cytoskeleton and cell membranes, was doubled 28 weeks after STZ injection. In addition, the moesin protein was expressed in a part of α-SMA-positive renal tubular epithelial cells. These findings were confirmed by cultured murine proximal tubular epithelial cells: The expression of moesin was induced under oxidative stress with hydrogen peroxide. These data indicate that OCTN1 would play some roles in progression of interstitial fibrosis under oxidative stress via moesin expression in diabetic kidney disease.
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Affiliation(s)
- Shohei Makiishi
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Kengo Furuichi
- Department of Nephrology, Kanazawa Medical University School of Medicine, Uchinada, Ishikawa, Japan.
| | - Yuta Yamamura
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Keisuke Sako
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Yasuyuki Shinozaki
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Tadashi Toyama
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Shinji Kitajima
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Yasunori Iwata
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Norihiko Sakai
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Miho Shimizu
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
| | - Tomoko Hirose-Sugiura
- Faculty of Pharmacy, Institute of Medical, Pharmaceutical and Health Science, Kanazawa University, Kanazawa, Japan
| | - Shuichi Kaneko
- Department of System Biology, Kanazawa University, Kanazawa, Japan
| | - Yukio Kato
- Faculty of Pharmacy, Institute of Medical, Pharmaceutical and Health Science, Kanazawa University, Kanazawa, Japan
| | - Takashi Wada
- Department of Nephrology and Laboratory Medicine, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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10
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Zhang HJ, Sellaiyan S, Sako K, Uedono A, Taniguchi Y, Hayashi K. Effect of Free-Volume Hole Fraction on Dynamic Mechanical Properties of Epoxy Resins Investigated by Pressure–Volume–Temperature Technique. J Phys Chem B 2020; 124:1824-1832. [DOI: 10.1021/acs.jpcb.9b10978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. J. Zhang
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - S. Sellaiyan
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - K. Sako
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - A. Uedono
- Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Y. Taniguchi
- NIPPON STEEL Chemical & Material Co., Ltd., Kitasode 11-5, Sodegaura, Chiba 299-0266, Japan
| | - K. Hayashi
- NIPPON STEEL Chemical & Material Co., Ltd., Kitasode 11-5, Sodegaura, Chiba 299-0266, Japan
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11
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Sako K, Furuichi K, Yamamura Y, Oshima M, Toyama T, Kaneko S, Wada T. Association between the recurrence period of acute kidney injury and mortality: a single-centre retrospective observational study in Japan. BMJ Open 2019; 9:e023259. [PMID: 31209081 PMCID: PMC6588963 DOI: 10.1136/bmjopen-2018-023259] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVES Recurrent acute kidney injury (AKI) is a recognised risk factor for mortality. However, it is unclear whether the period until AKI recurrence may have a major factor on patient outcome or not. To explore this issue, we (1) framed the hypothesis that early recurrence increases the risk of mortality and (2) evaluated the prognosis of recurrent AKI cases by setting 21 days as the cut-off period. METHODS All studied cases were admitted and followed up at the Kanazawa University Hospital (Kanazawa, Japan) between 1 November 2006 and 31 October 2007. In total, 21 939 patients were retrospectively evaluated in their recurrences of AKI for 2 years and followed up until 31 October 2016. Risks for death were evaluated by the recurrences of AKI (Analysis 1). Patients who developed AKI recurrence before 21 days were defined as the early-recurrence group and the remaining cases as the late-recurrence group. Risks for death were evaluated by the two groups (Analysis 2). RESULTS 510 patients (2.3%) developed the first AKI. Of these, 151 developed recurrent AKI within 2 years. The number of early-recurrence cases was 44 and that of non-recurrence or late-recurrence was 357. A total of 196 cases (38.4%) died, and higher risk for death was observed in the recurrent AKI group (Analysis 1; p=0.015, log-rank test). We found that the rate of all-cause mortality was higher in the early-recurrence group involving 33.8 deaths per 100 person-years, whereas the non-recurrence or late-recurrence group included only 6.2 deaths per 100 person-years (Analysis 2; p<0.001, log-rank test). CONCLUSIONS Patients experiencing recurrent AKI before 21 days from the first AKI clearly showed a relatively poor prognosis. Evidently, careful follow-up for at least 21 days after AKI would be highly useful to detect a recurrence event, possibly leading to a better prognosis after AKI.
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Affiliation(s)
- Keisuke Sako
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - Kengo Furuichi
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
- Department of Nephrology, Kanazawa Medical University School of Medicine, Uchinada, Kahoku, Ishikawa, Japan
| | - Yuta Yamamura
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - Megumi Oshima
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - Tadashi Toyama
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - Shuichi Kaneko
- Department of System Biology, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Takashi Wada
- Division of Nephrology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
- Department of Nephrology and Laboratory Medicine, Kanazawa University, Kanazawa, Ishikawa, Japan
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12
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Barone V, Lang M, Krens SFG, Pradhan SJ, Shamipour S, Sako K, Sikora M, Guet CC, Heisenberg CP. An Effective Feedback Loop between Cell-Cell Contact Duration and Morphogen Signaling Determines Cell Fate. Dev Cell 2017; 43:198-211.e12. [PMID: 29033362 DOI: 10.1016/j.devcel.2017.09.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 08/23/2017] [Accepted: 09/18/2017] [Indexed: 11/19/2022]
Abstract
Cell-cell contact formation constitutes an essential step in evolution, leading to the differentiation of specialized cell types. However, remarkably little is known about whether and how the interplay between contact formation and fate specification affects development. Here, we identify a positive feedback loop between cell-cell contact duration, morphogen signaling, and mesendoderm cell-fate specification during zebrafish gastrulation. We show that long-lasting cell-cell contacts enhance the competence of prechordal plate (ppl) progenitor cells to respond to Nodal signaling, required for ppl cell-fate specification. We further show that Nodal signaling promotes ppl cell-cell contact duration, generating a positive feedback loop between ppl cell-cell contact duration and cell-fate specification. Finally, by combining mathematical modeling and experimentation, we show that this feedback determines whether anterior axial mesendoderm cells become ppl or, instead, turn into endoderm. Thus, the interdependent activities of cell-cell signaling and contact formation control fate diversification within the developing embryo.
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Affiliation(s)
- Vanessa Barone
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Moritz Lang
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.
| | - S F Gabriel Krens
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Saurabh J Pradhan
- Indian Institute of Science, Education and Research (IISER), Pune 411008, India
| | - Shayan Shamipour
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Keisuke Sako
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Mateusz Sikora
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Călin C Guet
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
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13
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Abe T, Nakahara G, Hamauchi A, Nihira A, Mizobuchi M, Sako K. Electrophysiological findings in adult patients with neoplastic plexopathies. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.3572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Kikuchi H, Hamauchi A, Sako K, Mizobuchi M, Abe T, Nihira A, Matsuda M. Agrammatism in progressive non-fluent aphasia of Japanese: Advantage of syntactic processing test of aphasia. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Sako K, Pradhan SJ, Barone V, Inglés-Prieto Á, Müller P, Ruprecht V, Čapek D, Galande S, Janovjak H, Heisenberg CP. Optogenetic Control of Nodal Signaling Reveals a Temporal Pattern of Nodal Signaling Regulating Cell Fate Specification during Gastrulation. Cell Rep 2016; 16:866-77. [PMID: 27396324 DOI: 10.1016/j.celrep.2016.06.036] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/21/2016] [Accepted: 06/05/2016] [Indexed: 01/20/2023] Open
Abstract
During metazoan development, the temporal pattern of morphogen signaling is critical for organizing cell fates in space and time. Yet, tools for temporally controlling morphogen signaling within the embryo are still scarce. Here, we developed a photoactivatable Nodal receptor to determine how the temporal pattern of Nodal signaling affects cell fate specification during zebrafish gastrulation. By using this receptor to manipulate the duration of Nodal signaling in vivo by light, we show that extended Nodal signaling within the organizer promotes prechordal plate specification and suppresses endoderm differentiation. Endoderm differentiation is suppressed by extended Nodal signaling inducing expression of the transcriptional repressor goosecoid (gsc) in prechordal plate progenitors, which in turn restrains Nodal signaling from upregulating the endoderm differentiation gene sox17 within these cells. Thus, optogenetic manipulation of Nodal signaling identifies a critical role of Nodal signaling duration for organizer cell fate specification during gastrulation.
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Affiliation(s)
- Keisuke Sako
- Laboratory of Developmental Biology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Saurabh J Pradhan
- Indian Institute of Science, Education and Research, Pune 411008, India
| | - Vanessa Barone
- Laboratory of Developmental Biology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Álvaro Inglés-Prieto
- Laboratory of Synthetic Physiology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Patrick Müller
- Friedrich Miescher Laboratory of the Max Planck Society, 72076 Tübingen, Germany
| | - Verena Ruprecht
- Laboratory of Developmental Biology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Daniel Čapek
- Laboratory of Developmental Biology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Sanjeev Galande
- Indian Institute of Science, Education and Research, Pune 411008, India
| | - Harald Janovjak
- Laboratory of Synthetic Physiology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.
| | - Carl-Philipp Heisenberg
- Laboratory of Developmental Biology, Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.
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16
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Suzuki K, Yataka K, Okumiya Y, Sakakibara S, Sako K, Mimura H, Inoue Y. Rapid-Response, Widely Stretchable Sensor of Aligned MWCNT/Elastomer Composites for Human Motion Detection. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00145] [Citation(s) in RCA: 141] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Katsunori Suzuki
- Research
and Development Division, Yamaha Corporation, 10-1 Nakazawa-cho, Hamamatsu, 430-8650, Japan
- Research
Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8011, Japan
| | - Koji Yataka
- Research
and Development Division, Yamaha Corporation, 10-1 Nakazawa-cho, Hamamatsu, 430-8650, Japan
| | - Yasuro Okumiya
- Research
and Development Division, Yamaha Corporation, 10-1 Nakazawa-cho, Hamamatsu, 430-8650, Japan
| | - Shingo Sakakibara
- Research
and Development Division, Yamaha Corporation, 10-1 Nakazawa-cho, Hamamatsu, 430-8650, Japan
- Research
Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8011, Japan
| | - Keisuke Sako
- Department
of Electronics and Materials Science, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561, Japan
| | - Hidenori Mimura
- Research
Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8011, Japan
| | - Yoku Inoue
- Department
of Electronics and Materials Science, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 432-8561, Japan
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17
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Ruprecht V, Wieser S, Callan-Jones A, Smutny M, Morita H, Sako K, Barone V, Ritsch-Marte M, Sixt M, Voituriez R, Heisenberg CP. Actomyosin Network Contractility Triggers a Stochastic Transformation into Highly Motile Amoeboid Cells. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.3339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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18
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Yamaguchi A, Sako K, Sato K, Hayashizaki N, Hattori T. Measurement of beam characteristics from C(6+) laser ion source. Rev Sci Instrum 2014; 85:02B921. [PMID: 24593626 DOI: 10.1063/1.4847197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We developed a C(6+) laser ion source for a heavy-ion accelerator. A carbon target was irradiated with a Q-switched Nd:YAG laser (1064 nm wavelength, 1.4 J maximum laser energy, 10 ns pulse duration) to generate a high-density plasma. The laser ion source employed a rotating carbon target for continuous operation. Ion beams were extracted from the plasma through a drift space using a direct plasma injection scheme [B. Yu. Sharkov, A. V. Shumshurov, V. P. Dubenkow, O. B. Shamaev, and A. A. Golubev, Rev. Sci. Instrum. 63, 2841 (1992)] up to a maximum voltage of 40 kV. We measured the characteristics of the ion beams from the laser ion source and present the results of experiments here.
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Affiliation(s)
- A Yamaguchi
- Toshiba Corporation, Yokohama 230-0045, Japan
| | - K Sako
- Toshiba Corporation, Yokohama 230-0045, Japan
| | - K Sato
- Toshiba Corporation, Yokohama 230-0045, Japan
| | - N Hayashizaki
- Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - T Hattori
- National Institute of Radiological Sciences, Chiba 263-8555, Japan
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19
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Sako K, Kimura T, Sawamura A, Yonemasu Y, Takahashi M, Miyokawa N. Prevention of CSF Leakage by Staged Operation for Clival Metastatic Tumor. Skull Base Surg 2011; 7:159-62. [PMID: 17171026 PMCID: PMC1656631 DOI: 10.1055/s-2008-1058608] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
The transoral approach is a direct route to the clivus. However, application of this approach is infrequent because of the risk of cerebrospinal fluid (CSF) fistula and subsequent meningitis. We report a case of clival metastatic tumor treated by staged operation without CSF leakage. A 39-year-old man was found to have a tumor in clivus extending to the intradural space. Two-staged resection through the lateral suboccipital and transoral approach was performed and the dural defect was replaced by a fascia in the first operation. CSF leakage was prevented by this procedure. The patient received radiotherapy postoperatively.
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20
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Zhang J, Fukuhara S, Sako K, Takenouchi T, Kitani H, Kume T, Koh GY, Mochizuki N. Angiopoietin-1/Tie2 signal augments basal Notch signal controlling vascular quiescence by inducing delta-like 4 expression through AKT-mediated activation of beta-catenin. J Biol Chem 2011; 286:8055-8066. [PMID: 21212269 DOI: 10.1074/jbc.m110.192641] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Angiopoietin-1 (Ang1) regulates both vascular quiescence and angiogenesis through the receptor tyrosine kinase Tie2. We and another group previously showed that Ang1 and Tie2 form distinct signaling complexes at cell-cell and cell-matrix contacts. We further demonstrated that the former up-regulates Notch ligand delta-like 4 (Dll4) only in the presence of cell-cell contacts. Because Dll4/Notch signal restricts sprouting angiogenesis and promotes vascular stabilization, we investigated the mechanism of how the Ang1/Tie2 signal induces Dll4 expression to clarify the role of the Dll4/Notch signal in Ang1/Tie2 signal-mediated vascular quiescence. Under confluent endothelial cells, the basal Notch signal was observed. Ang1, moreover, induced Dll4 expression and production of the Notch intracellular domain (NICD). Ang1 stimulated transcriptional activity of β-catenin through phosphoinositide 3-kinase (PI3K)/AKT-mediated phosphorylation of glycogen synthase kinase 3β (GSK3β). Correspondingly, the GSK3β inhibitor up-regulated Dll4, whereas depletion of β-catenin by siRNA blocked Ang1-induced Dll4 expression, indicating the indispensability of β-catenin in Ang1-mediated up-regulation of Dll4. In addition, Dll4 expression by the GSK3β inhibitor was only observed in confluent cells, and was impeded by DAPT, a γ-secretase inhibitor, implying requirement of the Notch signal in β-catenin-dependent Dll4 expression. Consistently, we found that either Ang1 or NICD up-regulates Dll4 through the RBP-J binding site within intron 3 of the DLL4 gene and that β-catenin forms a complex with NICD/RBP-J to enhance Dll4 expression. Ang1 induced the deposition of extracellular matrix that is preferable for basement membrane formation through Dll4/Notch signaling. Collectively, the Ang1/Tie2 signal potentiates basal Notch signal controlling vascular quiescence by up-regulating Dll4 through AKT-mediated activation of β-catenin.
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Affiliation(s)
- Jianghui Zhang
- From the Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Fujishirodai 5-7-1, Suita, Osaka 565-8565, Japan
| | - Shigetomo Fukuhara
- From the Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Fujishirodai 5-7-1, Suita, Osaka 565-8565, Japan,.
| | - Keisuke Sako
- From the Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Fujishirodai 5-7-1, Suita, Osaka 565-8565, Japan
| | - Takato Takenouchi
- the Transgenic Animal Research Center, National Institute of Agrobiological Sciences, Ibaraki 305-8634, Japan,; the Laboratory for Chemistry and Metabolism, Tokyo Metropolitan Institute for Neuroscience, Tokyo 183-8526, Japan
| | - Hiroshi Kitani
- the Transgenic Animal Research Center, National Institute of Agrobiological Sciences, Ibaraki 305-8634, Japan
| | - Tsutomu Kume
- the Feinberg Cardiovascular Research Institute, Northwestern University, Chicago, Illinois 60611, and
| | - Gou Young Koh
- the Biomedical Research Center and Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Guseong-dong, Daejeon 305-701, Korea
| | - Naoki Mochizuki
- From the Department of Cell Biology, National Cerebral and Cardiovascular Center Research Institute, Fujishirodai 5-7-1, Suita, Osaka 565-8565, Japan,.
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Fukuhara S, Sako K, Noda K, Zhang J, Minami M, Mochizuki N. Angiopoietin-1/Tie2 receptor signaling in vascular quiescence and angiogenesis. Histol Histopathol 2010; 25:387-96. [PMID: 20054809 DOI: 10.14670/hh-25.387] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Angiopoietin (Ang) 1 is a ligand for endothelium-specific receptor tyrosine kinase Tie-2. In adult vasculature, Ang1/Tie2 signaling is thought to regulate both maintenance of vascular quiescence and promotion of angiogenesis. However, it has been unknown how Tie2 signal regulates these distinct biological functions. Recently, we and Alitalo's group have clarified that Ang1 assembles distinct Tie2 signaling complexes in either presence or absence of endothelial cell-cell adhesions. Ang1 induces trans-association of Tie2 at cell-cell contacts, whereas Tie2 is anchored to the extracellular matrix (ECM) by Ang1 at the cell-substratum interface. Trans-associated Tie2 and ECM-anchored Tie2 activate distinct signaling pathways. In this review, we discuss how Ang1/Tie2 signal regulates both maintenance of vascular quiescence and promotion of angiogenesis, especially focusing on the roles of trans-associated Tie2 and ECM-anchored Tie2.
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Affiliation(s)
- Shigetomo Fukuhara
- Department of Structural Analysis, National Cardiovascular Center Research Institute, Suita, Osaka, Japan.
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Fukuhara S, Sako K, Noda K, Nagao K, Miura K, Mochizuki N. Tie2 is tied at the cell-cell contacts and to extracellular matrix by angiopoietin-1. Exp Mol Med 2009; 41:133-9. [PMID: 19293632 DOI: 10.3858/emm.2009.41.3.016] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Angiopoietin-1 (Ang1) binds to and activates Tie2 receptor tyrosine kinase. Ang1-Tie2 signal has been proposed to exhibit two opposite roles in the controlling blood vessels. One is vascular stabilization and the other is vascular angiogenesis. There has been no answer to the question as to how Tie2 induces two opposite responses to the same ligand. Our group and Dr. Alitalos group have demonstrated that trans-associated Tie2 at cell-cell contacts and extracellular matrix (ECM)-anchored Tie2 play distinct roles in the endothelial cells. The complex formation depends on the presence or absence of cell-cell adhesion. Here, we review how Ang1-Tie2 signal regulates vascular maintenance and angiogenesis. We further point to the unanswered questions that must be clarified to extend our knowledge of vascular biology and to progress basic knowledge to the treatment of the diseases in which Ang1-Tie2-mediated signal is central.
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Sako K, Fukuhara S, Minami T, Hamakubo T, Song H, Kodama T, Fukamizu A, Gutkind JS, Koh GY, Mochizuki N. Angiopoietin-1 induces Kruppel-like factor 2 expression through a phosphoinositide 3-kinase/AKT-dependent activation of myocyte enhancer factor 2. J Biol Chem 2008; 284:5592-601. [PMID: 19106103 DOI: 10.1074/jbc.m806928200] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Angiopoietin-1 (Ang1) regulates both vascular quiescence and angiogenesis through the receptor tyrosine kinase Tie2. We and another group have recently shown that Ang1 and Tie2 form distinct signaling complexes at cell-cell and cell-matrix contacts and further demonstrated that the former selectively induces expression of Krüppel-like factor 2 (KLF2), a transcription factor involved in vascular quiescence. Here, we investigated the mechanism of how Ang1/Tie2 signal induces KLF2 expression to clarify the role of KLF2 in Ang1/Tie2 signal-mediated vascular quiescence. Ang1 stimulated KLF2 promoter-driven reporter gene expression in endothelial cells, whereas it failed when a myocyte enhancer factor 2 (MEF2)-binding site of KLF2 promoter was mutated. Depletion of MEF2 by siRNAs abolished Ang1-induced KLF2 expression, indicating the requirement of MEF2 in KLF2 induction by Ang1. Constitutive active phosphoinositide 3-kinase (PI3K) and AKT increased the MEF2-dependent reporter gene expression by enhancing its transcriptional activity and stimulated the KLF2 promoter activity cooperatively with MEF2. Consistently, inhibition of either PI3K or AKT and depletion of AKT abrogated Ang1-induced KLF2 expression. In addition, we confirmed the dispensability of extracellular signal-regulated kinase 5 (ERK5) for Ang1-induced KLF2 expression. Furthermore, depletion of KLF2 resulted in the loss of the inhibitory effect of Ang1 on vascular endothelial growth factor (VEGF)-mediated expression of vascular cell adhesion molecule-1 in endothelial cells and VEGF-mediated monocyte adhesion to endothelial cells. Collectively, these findings indicate that Ang1/Tie2 signal stimulates transcriptional activity of MEF2 through a PI3K/AKT pathway to induce KLF2 expression, which may counteract VEGF-mediated inflammatory responses.
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Affiliation(s)
- Keisuke Sako
- Department of Structural Analysis, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan
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Fukuhara S, Sako K, Minami T, Noda K, Kim HZ, Kodama T, Shibuya M, Takakura N, Koh GY, Mochizuki N. Differential function of Tie2 at cell-cell contacts and cell-substratum contacts regulated by angiopoietin-1. Nat Cell Biol 2008; 10:513-26. [PMID: 18425120 DOI: 10.1038/ncb1714] [Citation(s) in RCA: 272] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2007] [Accepted: 02/29/2008] [Indexed: 12/13/2022]
Abstract
Tie2 belongs to the receptor tyrosine kinase family and functions as a receptor for Angiopoietin-1 (Ang1). Gene-targeting analyses of either Ang1 or Tie2 in mice reveal a critical role of Ang1-Tie2 signalling in developmental vascular formation. It remains elusive how the Tie2 signalling pathway plays distinct roles in both vascular quiescence and angiogenesis. We demonstrate here that Ang1 bridges Tie2 at cell-cell contacts, resulting in trans-association of Tie2 in the presence of cell-cell contacts. In clear contrast, in isolated cells, extracellular matrix-bound Ang1 locates Tie2 at cell-substratum contacts. Furthermore, Tie2 activated at cell-cell or cell-substratum contacts leads to preferential activation of Akt and Erk, respectively. Microarray analyses and real-time PCR validation clearly show the differential gene expression profile in vascular endothelial cells upon Ang1 stimulation in the presence or absence of cell-cell contacts, implying downstream signalling is dependent upon the spatial localization of Tie2.
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Affiliation(s)
- Shigetomo Fukuhara
- Department of Structural Analysis, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan.
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Abstract
Vascular endothelial cadherin (VE-cadherin), which belongs to the classical cadherin family, is localized at adherens junctions exclusively in vascular endothelial cells. Biochemical and biomechanical cues regulate the VE-cadherin adhesive potential by triggering the intracellular signals. VE-cadherin-mediated cell adhesion is required for cell survival and endothelial cell deadhesion is required for vascular development. It is therefore crucial to understand how VE-cadherin-based cell adhesion is controlled. This review summarizes the inter-endothelial cell adhesions and introduces our recent advance in Rap1-regulated VE-cadherin adhesion. A further analysis of the VE-cadherin recycling system will aid the understanding of cell adhesion/deadhesion mechanisms mediated by VE-cadherin in response to extracellular stimuli during development and angiogenesis.
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Affiliation(s)
- Shigetomo Fukuhra
- Department of Structural Analysis, National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan
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Sakurai A, Fukuhara S, Yamagishi A, Sako K, Kamioka Y, Masuda M, Nakaoka Y, Mochizuki N. MAGI-1 is required for Rap1 activation upon cell-cell contact and for enhancement of vascular endothelial cadherin-mediated cell adhesion. Mol Biol Cell 2005; 17:966-76. [PMID: 16339077 PMCID: PMC1356604 DOI: 10.1091/mbc.e05-07-0647] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.7] [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: 01/12/2023] Open
Abstract
Rap1 is a small GTPase that regulates adherens junction maturation. It remains elusive how Rap1 is activated upon cell-cell contact. We demonstrate for the first time that Rap1 is activated upon homophilic engagement of vascular endothelial cadherin (VE-cadherin) at the cell-cell contacts in living cells and that MAGI-1 is required for VE-cadherin-dependent Rap1 activation. We found that MAGI-1 localized to cell-cell contacts presumably by associating with beta-catenin and that MAGI-1 bound to a guanine nucleotide exchange factor for Rap1, PDZ-GEF1. Depletion of MAGI-1 suppressed the cell-cell contact-induced Rap1 activation and the VE-cadherin-mediated cell-cell adhesion after Ca2+ switch. In addition, relocation of vinculin from cell-extracellular matrix contacts to cell-cell contacts after the Ca2+ switch was inhibited in MAGI-1-depleted cells. Furthermore, inactivation of Rap1 by overexpression of Rap1GAPII impaired the VE-cadherin-dependent cell adhesion. Collectively, MAGI-1 is important for VE-cadherin-dependent Rap1 activation upon cell-cell contact. In addition, once activated, Rap1 upon cell-cell contacts positively regulate the adherens junction formation by relocating vinculin that supports VE-cadherin-based cell adhesion.
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Affiliation(s)
- Atsuko Sakurai
- Department of Structural Analysis, National Cardiovascular Center Research Institute, Suita, Osaka 565-8565, Japan
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Sako K, Okuma Y, Hosoi T, Nomura Y. STAT3 activation and c-FOS expression in the brain following peripheral administration of bacterial DNA. J Neuroimmunol 2005; 158:40-9. [PMID: 15589036 DOI: 10.1016/j.jneuroim.2004.08.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 04/21/2004] [Revised: 08/02/2004] [Accepted: 08/02/2004] [Indexed: 10/26/2022]
Abstract
To study the role of bacterial DNA in the brain function, we investigated signal transducer and activator of transcription 3 (STAT3) activation and c-FOS expression in the brain by immunohistochemistry in response to peripheral administration of CpG-DNA. CpG-DNA induced phospho-STAT3-immunoreactive cells and c-FOS-positive cells in several brain regions in a different manner. Phospho-STAT3-immunoreactive cells were observed in the circumventricular organs where the blood-brain barrier is weak. On the other hand, CpG-DNA increased c-FOS-positive cells in the paraventricular nucleus of the hypothalamus, and the nucleus of the tractus solitarius (NTS) and the area postrema. Unilateral cervical vagotomy did not modify CpG-DNA-induced c-FOS expression in the NTS, indicating that CpG-DNA-induced activation of the NTS is independent of the afferent vagus nerve input originating from the subdiaphragmatic organs. On the other hand, Toll-like receptor 9 mRNA was expressed in the nodose ganglion. Therefore, it is possible that CpG-DNA activates afferent vagus nerve through the nodose ganglion which subsequently activates the NTS. Present observations represented that peripheral CpG-DNA induced immune event in the brain, and that not only c-FOS but also phosphorylation of STAT3 can be a useful indicator for evaluation of neuro-immune interaction.
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Affiliation(s)
- Keisuke Sako
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita 12, Nishi 6, Kita-ku, Sapporo 060-0812, Japan
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Sawada T, Sako K, Fukui M, Yokohama S, Hayashi M. A new index, the core erosion ratio, of compression-coated timed-release tablets predicts the bioavailability of acetaminophen. Int J Pharm 2003; 265:55-63. [PMID: 14522118 DOI: 10.1016/s0378-5173(03)00405-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [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: 10/27/2022]
Abstract
Although compression-coated tablets are a commonly used timed-release drug delivery technology, their utility is often limited by poor bioavailability. To try to improve the bioavailability of these tablets, the effect of their core composition of compression-coated tablet on in vivo pharmacokinetics was investigated. First, the extent of mass reduction of cores in different compression-coated tablet core formulations was used to establish a new index, the core erosion ratio. The data show that adding excipients with high water solubility to the core results in a greater core erosion ratio. Next, to elucidate the effect of core erosion ratio on in vivo acetaminophen (AAP) release, three compression-coated tablet formulations with similar in vitro AAP release profiles but different core erosion ratios were administered to four fasted dogs. The time for first appearance (TFA) of AAP in plasma did not differ significantly among formulations, indicating that the in vivo lag time was the same for all formulations. In separate experiments, necroscopy revealed that 3h after oral administration, the tablets were located in the ileum and colon and that all three formulations had identical GI transit times. However, the area under the AAP plasma concentration-time curve was greater in dogs given formulations with larger core erosion ratios. These results suggest that a formulation with a large core erosion ratio can significantly increase in vivo drug release from compression-coated tablets, leading to increased drug absorption from the lower GI tract.
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Affiliation(s)
- T Sawada
- DDS Research, Novel Pharmaceutical Research Laboratories, Institute for Technology Development, Yamanouchi Pharmaceutical Co., Ltd., 180 Ozumi, Yaizu-shi, Shizuoka 425-0072, Japan.
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Kimura T, Sako K, Tohyama Y, Aizawa S, Yoshida H, Aburano T, Tanaka K, Tanaka T. Diagnosis and treatment of progressive space-occupying radiation necrosis following stereotactic radiosurgery for brain metastasis: value of proton magnetic resonance spectroscopy. Acta Neurochir (Wien) 2003; 145:557-64; discussion 564. [PMID: 12910398 DOI: 10.1007/s00701-003-0051-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND There have been some reports that radiation necrosis can be controlled conservatively. There are rare cases showing progressive space-occupying radiation necrosis (PSORN). It is very difficult to control PSORN by conservative treatment. The purpose of this study was to evaluate the early diagnosis of those cases and the timing of surgery for patients with PSORN. METHOD We have experienced some cases where quality of life was improved by the removal of PSORN after stereotactic radiosurgery (SRS) for brain metastases. Therefore, we evaluated retrospectively the diagnosis and treatment of six cases of symptomatic PSORN at approximately 6-12 months after SRS for metastatic brain tumours. FINDINGS In all six cases, on Magnetic Resonance Imaging with Gd contrast material (Gd-MRI), PSORN was revealed as a ring-like enhanced mass with large perifocal oedema coupled with the appearance of neurological deficit. Proton Magnetic Resonance Spectroscopy ((1)H-MRS) enabled us to differentiate PSORN from recurrence of metastases in all six cases. Single Photon Emission Computed Tomography with thallium-201 chloride (201TlCl-SPECT) enabled us to do this in four cases of the six. In four cases of the six, lesionectomy of the ring-like enhanced mass (PSORN) was performed, and in two of these cases the removal was performed within 4 weeks from the time when conservative treatment became ineffective, and the neurological deficit and perifocal oedema was improved as was the quality of life. However, in the other two patients who were left for more than 16 weeks, the deficit was gradually progressive. The two patients who did not receive lesionectomy were treated by conservative means with steroids and/or heparin and warfarin and they had progressive neurological symptoms. INTERPRETATION Although, the number of patients is small in this study, and more data will be needed, it is recommended that lesionectomy is performed at an early stage, if possible, when conservative management has failed.
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Affiliation(s)
- T Kimura
- Department of Neurosurgery, Asahikawa Medical College, Asahikawa, Hokkaido, Japan.
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Kimura T, Sako K, Gotoh T, Tanaka K, Tanaka T. In vivo single-voxel proton MR spectroscopy in brain lesions with ring-like enhancement. NMR Biomed 2001; 14:339-349. [PMID: 11599032 DOI: 10.1002/nbm.711] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
It is often difficult to make a correct diagnosis of ring-like enhanced lesions on Gd-enhanced MR brain images. To differentiate these lesions using proton MR spectroscopy (1H-MRS), we retrospectively evaluated the correlation between the 1H-MR spectra and histopathological findings. We evaluated proton MR spectra obtained from the lesions in 45 patients, including metastasis (n = 19), glioblastoma (n = 10), radiation necrosis (n = 7), brain abscess (n = 5), and cerebral infarction (n = 4). The rate of misdiagnosis was found to be lowest at the threshold level of 2.48 for the (choline containing compounds)/(creatine and phosphocreatine) ratio (Cho/Cr) obtained from the whole lesions, which include the enhanced rim and the non-enhanced inner region. That is, the positively predictive values of a Cho/Cr greater than 2.48 for diagnosing metastasis or glioblastoma was 88.9 and 60.0%, respectively, and the positively predictive value of a Cho/Cr less than 2.48 for diagnosing radiation necrosis or cerebral infarction was 71.4 and 100%, respectively. For further differentiating between metastasis and glioblastoma, information about the presence and absence of an N-acetyl-aspartate (NAA) peak and lipid- or lactate-dominant peak was found to be useful. In 73.7% of metastasis cases a lipid-dominant peak was observed in the whole lesion without an NAA peak in the inner region, whereas the same pattern was observed in only 10% of the glioblastoma cases. Correlation with the histopathological findings showed that a high Cho signal is suggestive of neoplasm. Lipid signal in the non-enhanced central region was correlated to necrosis. Lactate signals were often observed in glioblastoma, abscess and sometimes metastasis, presumably reflecting the anaerobic glycolysis by the living cells in the ring-like enhanced rim. Single-voxel proton MR spectroscopy may serve as a potential tool to provide useful information of differentiation of ring-like enhanced lesions that cannot be diagnosed correctly using enhanced MR images alone.
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Affiliation(s)
- T Kimura
- Department of Neurosurgery, Asahikawa Medical College, Asahikawa, Hokkaido 078-8510, Japan.
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Ueno S, Tanabe G, Sako K, Hiwaki T, Hokotate H, Fukukura Y, Baba Y, Imamura Y, Aikou T. Discrimination value of the new western prognostic system (CLIP score) for hepatocellular carcinoma in 662 Japanese patients. Cancer of the Liver Italian Program. Hepatology 2001; 34:529-34. [PMID: 11526539 DOI: 10.1053/jhep.2001.27219] [Citation(s) in RCA: 228] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
To reliably estimate the prognoses of patients with hepatocellular carcinoma (HCC), both liver function and tumor-related factors should be accounted for. However, there are few worldwide staging systems that assess prognostic value in the context of selecting individual patients for randomized stratification in therapeutic and clinical trials. We investigated the value of known prognostic systems and verified the usefulness of the new scoring system proposed by the Cancer of the Liver Italian Program (CLIP), as determined from 662 Japanese patients. A retrospective analysis of the HCC diagnoses at 4 Japanese institutions from 1990 and 1998 was performed. Overall survival was the only end point used in the analysis. Discriminatory ability and predictive power of the CLIP score were compared with those of Okuda stage and AJCC TNM stage. Compared with the Okuda and AJCC staging systems, the CLIP score's enhanced discriminatory capacity, which was tested by the linear trend test and Harrels' c-index, revealed a class of patients with an impressively more favorable prognosis and another class with a relatively shorter life expectancy. Moreover, the likelihood ratio test showed that the CLIP score had additional homogeneity of survival within each score above that of the Okuda stage or the AJCC stage. This was true for 3 subgroups of patients who received surgery, transcatheter arterial chemoembolizations, and percutaneous ethanol injections. Collectively, these findings indicate that the CLIP score has the highest stratification ability with regard to prognosis in patients with HCC. The CLIP score could be used internationally to stratify randomization groups in therapeutic and clinical trials.
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Affiliation(s)
- S Ueno
- First Department of Surgery, Kagoshima University, School of Medicine, Kagoshima, Japan.
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Abstract
Dystonic posturing (DP) is one of the most reliable lateralizing symptoms for mesial temporal lobe epilepsy, although the mechanism remains unclear. We demonstrated a hyperperfusion area in the right putamen on subtracted postictal SPECT by using the automatic registration technique in one patient with ictal DP of the left hand. The putamen may play a key role in DP, similar to other diseases with dystonia.
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Affiliation(s)
- M Mizobuchi
- Department of Neurology, Nakamura Memorial Hospital, Sapporo, Japan.
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Shuke N, Nagasawa K, Yamamoto W, Usui K, Sako K, Nakai H, Tanaka T, Aburano T. Demonstration of Positional Posterior Circulation Cerebral Ischemia on Cerebral Blood Flow SPECT. Clin Nucl Med 2001; 26:559-60. [PMID: 11353313 DOI: 10.1097/00003072-200106000-00022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- N Shuke
- Department of Radiology, Asahikawa Medical College, Asahikawa, Japan
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Kusunoki T, Odano N, Yoritsune T, Ishida T, Hoshi T, Sako K. Design of advanced integral-type marine reactor, MRX. Nuclear Engineering and Design 2000. [DOI: 10.1016/s0029-5493(00)00285-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mizobuchi M, Tanaka C, Sako K, Murakami N, Nihira A, Abe T, Tateno Y, Takahashi T, Nonaka I. [Muscle involvement of Stormorken's syndrome]. Rinsho Shinkeigaku 2000; 40:915-20. [PMID: 11257789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
We described two patients, a mother and daughter, of Stormorken's syndrome. The syndrome is characterized clinically by autosomal dominant inheritance, congenital miosis, thrombocytopenia, asplenia and muscle weakness. Both patients had bleeding tendency, ichthyosis of arms, and muscle weakness. The daughter additionally had short stature (146 cm), low body weight (32 kg) and muscle cramp. Neurological findings of the patients included migraine-like headache, cognitive dysfunction, limitation of upward and lateral gaze, and amydriasis. Femoral muscle MRI of the daughter demonstrated decreased volume with patchy high intensity areas in the hamstrings. A muscle biopsy from the daughter showed myogenic changes with muscle fiber necrosis and regeneration, variation in fiber size, tubular aggregates in approximately 5% of fibers, and fibrous tissue proliferation. Dystrophin, dystrophin-associated proteins and dysferlin were normally expressed. Although both patients had elevated creatine kinase levels and generalized muscle wasting, muscle weakness was mild with slow progression. A certain membrane defect in the platelet and muscle fiber might be responsible for the pathogenesis of this syndrome.
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Affiliation(s)
- M Mizobuchi
- Department of Neurology, Nakamura Memorial Hospital
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Kimura T, Sako K, Satou M, Kuroda K, Makino K, Moriyama R. [A case of intracerebral and subarachnoid hemorrhage of unknown origin with preceding headache]. No To Shinkei 2000; 52:817-20. [PMID: 11064870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
We report a case of a 31-year-old female with multiple intracerebral hemorrhage and subarachnoid hemorrhage. She presented with headache one week before hemorrhage, and a CT scan performed at that time showed no abnormal findings. Neurological examination on admission revealed mild disturbance of consciousness, papilledema, and mild left hemiparesis. CT scans demonstrated intracerebral hemorrhage in the right caudate head and left frontal subcortex, and diffuse subarachnoid hemorrhage. Cerebral angiogram and laboratory examination revealed no abnormal findings. Erythrocyte sedimentation rate, C reactive protein and antiphospholipid antibody were within normal ranges. The patient underwent removal of hematoma by craniotomy. One week after the operation, a subcutaneous hematoma in the area of the craniotomy was found. Cerebral angiography demonstrated an aneurysm of the right superficial temporal artery, which was remote from the craniotomy. This aneurysm was surgically removed and examined. Histopathological examination revealed the presence of a pseudoaneurysm but no inflammation. Although primary angitis of the central nervous system was suspected to be the cause of this disease, a definite diagnosis could not be obtained.
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Affiliation(s)
- T Kimura
- Department of Neurosurgery, Moriyama Hospital, Hokkaido, Japan
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Ando K, Sako K, Takahashi M, Beppu M, Kikugawa K. Increased band 3 protein aggregation and anti-band 3 binding of erythrocyte membranes on treatment with sesamol. Biol Pharm Bull 2000; 23:159-64. [PMID: 10706378 DOI: 10.1248/bpb.23.159] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The influence of sesamol, an antioxidant in processed sesame oil, on oxidative modification of human erythrocyte membrane proteins was investigated. Human erythrocytes were incubated with sesamol at various concentrations up to 10 mM at 37 degrees C for 1 h. The amounts of hemoglobin bound to the membranes and detergent C12E8-insoluble membrane protein aggregates were increased as the concentration of sesamol increased. Western blot analysis indicated that aggregates of band 3 protein were increased by the treatment. Binding of anti-band 3 antibody to the erythrocytes was increased by the treatment. Isolated cell membranes were incubated with sesamol similarly. Aggregates of band 3 protein were also increased, indicating that the band 3 protein aggregation was little affected by hemoglobin bound to the membranes. Aggregation of band 3 protein in the treatment of isolated cell membranes was partially prevented when the treatment was conducted under anaerobic conditions, suggesting that augmentation of the protein aggregation by sesamol involved both oxygen-dependent and oxygen-independent pathways. Among phenolics, sesamol showed a distinctive feature to increase band 3 protein aggregation in erythrocyte membranes and to enhance anti-band 3 binding to erythrocytes.
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Affiliation(s)
- K Ando
- School of Pharmacy, Tokyo University of Pharmacy and Life Science, Hachioji, Japan
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Hasegawa S, Yamasaki N, Hiwaki T, Sako K, Komorizono Y, Baba Y, Imamura Y, Kubozono O, Yoshida A, Arima T. Factors that predict intrahepatic recurrence of hepatocellular carcinoma in 81 patients initially treated by percutaneous ethanol injection. Cancer 1999. [PMID: 10547540 DOI: 10.1002/(sici)1097-0142(19991101)86:9<1682::aid-cncr9>3.0.co;2-6] [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: 12/15/2022]
Abstract
BACKGROUND In Japan, where liver transplantation has not been used to treat patients with hepatocellular carcinoma (HCC), percutaneous ethanol injection (PEI) has been employed for those with small HCCs that are not amenable to surgical resection. In the current study, the authors evaluated PEI as a treatment for HCC patients by studying recurrence rates and survival after treatment. They then examined the clinicopathologic factors that predicted patterns of local and distant intrahepatic recurrence. METHODS For 81 patients who underwent PEI as initial therapy between 1990 and 1997, the cumulative recurrence and survival rates and their correlations with 16 clinicopathologic factors were studied using the Kaplan-Meier method. RESULTS The 3-year overall cumulative rates of intrahepatic recurrence and survival were 81% and 84%, respectively. At the end of the observation period, intrahepatic recurrence was detected in 56 patients (69%). In 21 (38%) of 56 patients, local recurrences were significantly associated with earlier stages of underlying cirrhosis, decreased indocyanine green retention at 15 minutes (ICG R15), larger tumor size, and histologically advanced tumor grade. Distant intrahepatic recurrence was also significantly associated with liver function and ICG R15. CONCLUSIONS PEI is most effective as the initial treatment for patients with well-differentiated HCC when the tumor is less than 15 mm in greatest dimension. However, local recurrence depends predominantly on the biologic characteristics of the tumor, regardless of the efficacy of PEI. Surgical resection of HCC should be considered, especially for patients with mild liver dysfunction.
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Affiliation(s)
- S Hasegawa
- Second Department of Internal Medicine, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
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Affiliation(s)
- T Kimura
- Department of Neurosurgery, Asahikawa Medical College, Hokkaido, Japan
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Hasegawa S, Yamasaki N, Hiwaki T, Sako K, Komorizono Y, Baba Y, Imamura Y, Kubozono O, Yoshida A, Arima T. Factors that predict intrahepatic recurrence of hepatocellular carcinoma in 81 patients initially treated by percutaneous ethanol injection. Cancer 1999; 86:1682-90. [PMID: 10547540 DOI: 10.1002/(sici)1097-0142(19991101)86:9<1682::aid-cncr9>3.0.co;2-6] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [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: 11/11/2022]
Abstract
BACKGROUND In Japan, where liver transplantation has not been used to treat patients with hepatocellular carcinoma (HCC), percutaneous ethanol injection (PEI) has been employed for those with small HCCs that are not amenable to surgical resection. In the current study, the authors evaluated PEI as a treatment for HCC patients by studying recurrence rates and survival after treatment. They then examined the clinicopathologic factors that predicted patterns of local and distant intrahepatic recurrence. METHODS For 81 patients who underwent PEI as initial therapy between 1990 and 1997, the cumulative recurrence and survival rates and their correlations with 16 clinicopathologic factors were studied using the Kaplan-Meier method. RESULTS The 3-year overall cumulative rates of intrahepatic recurrence and survival were 81% and 84%, respectively. At the end of the observation period, intrahepatic recurrence was detected in 56 patients (69%). In 21 (38%) of 56 patients, local recurrences were significantly associated with earlier stages of underlying cirrhosis, decreased indocyanine green retention at 15 minutes (ICG R15), larger tumor size, and histologically advanced tumor grade. Distant intrahepatic recurrence was also significantly associated with liver function and ICG R15. CONCLUSIONS PEI is most effective as the initial treatment for patients with well-differentiated HCC when the tumor is less than 15 mm in greatest dimension. However, local recurrence depends predominantly on the biologic characteristics of the tumor, regardless of the efficacy of PEI. Surgical resection of HCC should be considered, especially for patients with mild liver dysfunction.
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Affiliation(s)
- S Hasegawa
- Second Department of Internal Medicine, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
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Yagi Y, Sekine S, Shimada T, Masiello A, Hayase K, Hirano Y, Hirota I, Kiyama S, Koguchi H, Maejima Y, Sakakita H, Sato Y, Sugisaki K, Hasegawa M, Yamane M, Sato F, Oyabu I, Kuno K, Minato T, Kiryu A, Takagi S, Sako K, Kudough F, Urata K, Kaguchi H, Orita J, Sago H, Ishigami Y. Front-end system of the TPE-RX reversed-field pinch machine. Fusion Engineering and Design 1999. [DOI: 10.1016/s0920-3796(99)00056-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Affiliation(s)
- T Kimura
- Department of Neurosurgery, Noriyama Hospital, Hokkaido, Japan
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Abstract
PURPOSE We describe a patient with complex partial seizure with unidirectional olfactory aura associated with ipsilateral unruptured aneurysm. METHODS AND RESULTS The patient felt a sweet pleasant smell coming from behind her right side every time before the attack. Cranial magnetic resonance imaging (MRI) and three-dimensional computed tomography (CT) angiography revealed a large aneurysm at the bifurcation of the right middle cerebral artery and compression of the right orbitofrontal cortex. Small spikes were recorded from the right orbitofrontal and superior temporal gyri and from the uncus by the cortical electrodes during clipping of the aneurysm. CONCLUSIONS The orbitofrontal cortex may have a function related to the ipsilateral directional olfactory sensation.
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Affiliation(s)
- M Mizobuchi
- Department of Neurology, Nakamura Memorial Hospital, Sapporo, Japan
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Tatsunami S, Sako K, Kuwabara R, Yamada K. Using Gaussian-like input rate function in the two-compartment model. Formulation and application to analysis of didanosine plasma concentration in two Japanese hemophiliacs. Int J Clin Pharmacol Res 1998; 18:129-35. [PMID: 9825269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
We used a time-dependent input rate function in the two-compartment model to simulate drug plasma concentrations after an oral administration. The input rate term has a Gaussian-like structure with two parameters, time to maximum absorption rate (tm) and measure of the duration of the absorption process (s). This structure corresponds to the scenario in which the absorption rate of the drug into the central compartment changes unimodally with respect to time after administration with a single peak at time tm. We demonstrate the applicability of this formulation in the simulation of plasma concentration of didanosine after oral administration in two Japanese hemophiliacs. We found that we were able to simulate the time courses of the didanosine plasma concentrations in both patients using the theoretical equation with the input term included, and that we were able to determine the six parameters in the equation by the least squares estimation. Pharmacokinetic values derived from the best-fit curve were almost comparable to those reported in other literature except that the Cmax and AUC0-infinity seemed to be slightly higher than those reported elsewhere. Although we are unable to verify the accuracy of this formulation because of the lack of sufficient Japanese data, we are able to demonstrate its efficacy and convenience in the application presented here.
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Affiliation(s)
- S Tatsunami
- Radioisotope Research Institute, St. Marianna University School of Medicine, Kawasaki, Japan
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Sugimura T, Sako K, Tohyama Y, Yonemasu Y. Consecutive in vivo measurement of nitric oxide in transient forebrain ischemic rat under normothermia and hypothermia. Brain Res 1998; 808:313-6. [PMID: 9767179 DOI: 10.1016/s0006-8993(98)00822-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/13/2022]
Abstract
The effects of hypothermia on production of nitric oxide (NO) in ischemic brain were investigated by using in vivo microdialysis. Male Wistar rats were randomly divided into three groups; saline-treated normothermic group (37 degreesC, n=6), 30 mg/kg N-nitro-l-arginine methyl ester(l-NAME)-treated normothermic group (n=6), and saline-treated hypothermic group (30 degreesC, n=6). Transient forebrain ischemia was produced by bilateral common carotid artery occlusion combined with hypotension (MABP=50 mmHg). Saline-treated normothermic animals resulted in a reduction of LCBF to 9% of baseline. Saline-treated hypothermic rats revealed the similar changes of LCBF. In contrast, l-NAME administration reduced the basal CBF to 85% of saline-treated group and to 8% after ischemia. NO products were decreased during ischemia and transiently increased after reperfusion in saline-treated groups. However, the increase of NO products after reperfusion was less significant in the hypothermia. l-NAME-treated group showed a constant reduction of NO production during ischemia and after reperfusion.
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Affiliation(s)
- T Sugimura
- Department of Neurosurgery, Asahikawa Medical College, 4-5 Nishikagura, Asahikawa, 078, Japan
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Abstract
Hypothermia has proven to be neuroprotective against ischemic brain injury. However, the exact mechanism has not yet been fully understood. In this study, we investigated the effects of hypothermia on cerebral glucose metabolism and blood flow in focal ischemic rats. Rats were divided into normothermic (37+/-0.5 degrees C) and hypothermic (30+/-0.5 degrees C) groups. Focal cerebral ischemia was induced by middle cerebral and ipsilateral common carotid arteries occlusion. Two hours after ischemia, autoradiographic studies of 2-deoxyglucose and iodoantipyrine were performed to measure local cerebral glucose utilization (LCGU) and cerebral blood flow. LCGU in the ischemic core was excessively reduced in both groups. However, a marked increase in LCGU was observed in the boundary zone of the ischemic core in normothermic rats. On the other hand, hyperglycolysis in the boundary zone of the ischemic core was suppressed in hypothermia. This attenuation of hyperglycolysis might be closely related to survival of the ischemic penumbra in hypothermia.
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Affiliation(s)
- Y Tohyama
- Department of Neurosurgery, Asahikawa Medical College, Hokkaido, Japan
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Sako K, Asai M, Matsushita M, Hojo K, Masahashi T, Suzuki M, Noguchi M, Nakanishi M. Effect of ethanol on human fetal placental circulation and its mechanism of action. Placenta 1998. [DOI: 10.1016/s0143-4004(98)91217-6] [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: 11/28/2022]
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Maeda T, Hashizume K, Sako K, Tanaka T. [The effect of hippocampal dentate granule cell lesions upon the limbic seizure model of rats]. No To Shinkei 1998; 50:643-9. [PMID: 9739523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The purpose of this study was to determine the role of dentate granule cells upon limbic seizure of Wistar rat caused by unilateral intra-amygdaloid administration of kainic acid (KA). Stereotactic surgery was performed in Wistar rats and stainless steel injection chemitorode was inserted in the left amygdala. Left dentate granule cells lesion were induced by microinjection of colchicine. The rats obtained recovery period for 7 days, postoperatively. The rats were divided into two groups. One group were used for observation of symptoms and electroencephalographic findings during the limbic seizure for 6 hours after the KA injection. Another group was processed for measuring local cerebral glucose utilization (LCGU) during limbic seizure status. The histological study demonstrated a selective loss of dentate granule cells in the left hippocampus 7 days after the colchicine injection. After the KA injection, initiation of the spike discharge was significantly retarded not only in the hippocampus (from 6.01 min. to 37.25 min.) but also in the amygdala (from 2.96 min. to 10.8 min.). Progression, frequency and intensity of the KA induced seizures were also inhibited by the colchicine-induced dentate granule cells lesion. During limbic seizure status, LCGU obtained by 14C-deoxyglucose autoradiography were significantly decreased not only in the hippocampus but also in the amygdala on the site of KA injection. These data suggest that hippocampal dentate granule cells play an important role on initiation and progression of the KA induced limbic seizure. The result suggested that there was an acceleration mechanism of the limbic seizure between amygdala and hippocampus.
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Affiliation(s)
- T Maeda
- Department of Neurosurgery, Asahikawa Medical College, Japan
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Sako K, Nakai H, Kawata Y, Takizawa K, Satho M, Yonemasu Y. Temporary arterial occlusion during anterior communicating or anterior cerebral artery aneurysm operation under tibial nerve somatosensory evoked potential monitoring. Surg Neurol 1998; 49:316-22; discussion 322-3. [PMID: 9508122 DOI: 10.1016/s0090-3019(97)00225-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Median nerve somatosensory evoked potentials (SEP) have been used as an indicator of cerebral ischemia in the territory of the middle cerebral artery. This study was designed to examine whether tibial nerve SEPs are a useful technique for detecting ischemia in the territory of the anterior cerebral artery (ACA) during aneurysm surgery. METHODS Tibial nerve SEP monitoring was employed in 15 patients who underwent temporary arterial occlusion during surgery for aneurysms of the anterior communicating artery (ACoA) or ACA. To evaluate tibial nerve SEPs, the data after anesthesia induction but before the start of surgery were used as the control and a more than 50% decrease in the amplitude of P40-N50 was regarded as a significant change. RESULTS Changes in SEP were recognized in 11 of these 15 patients. Unilateral A1 occlusion resulted in SEP changes in 4/7, while bilateral A1 interruption caused changes in 6/8 of the patient group. The allowable duration of interruption of the ACA cannot be determined by A1 dominance or the extent of development of the ACoA that can be recognized by angiography. The significance of the collateral circulation via the leptomeninges was indicated. Following the release of the occlusion, SEPs were restored to the control level in all patients and no new motor deficits were found. CONCLUSIONS It was concluded that tibial nerve SEP monitoring is a useful system to determine the extent of cerebral ischemia of the ACA territory during temporary arterial occlusion associated with surgery for aneurysms involving the ACA system.
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Affiliation(s)
- K Sako
- Department of Neurosurgery, Asahikawa Medical College, Nayoro City Hospital, Hokkaido, Japan
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50
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Tohyama Y, Sako K, Yonemasu Y. Hypothermia attenuates the activation of protein kinase C in focal ischemic rat brain: dual autoradiographic study of [3H]phorbol 12,13-dibutyrate and iodo[14C]antipyrine. Brain Res 1998; 782:348-51. [PMID: 9519286 DOI: 10.1016/s0006-8993(97)01180-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Using phorbol 12,13-dibutyrate (PDBu) autoradiography, we investigated the effect of hypothermia or protein kinase C (PKC) activation in rat brain 2 h after focal ischemia. In normothermia, a significant increase of PDBu binding was observed in ischemic brain. Hypothermia suppressed the increase of PDBu binding in degree and extent. These observations suggest that intraischemic hypothermia attenuates the activation of PKC, and this may in part be participate in the protective effect of hypothermia.
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Affiliation(s)
- Y Tohyama
- Department of Neurosurgery, Asahikawa Medical College, Japan
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