1
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Arai Y, Yamanaka I, Okamoto T, Isobe A, Nakai N, Kamimura N, Suzuki T, Daidoji T, Ono T, Nakaya T, Matsumoto K, Okuzaki D, Watanabe Y. Stimulation of interferon-β responses by aberrant SARS-CoV-2 small viral RNAs acting as retinoic acid-inducible gene-I agonists. iScience 2023; 26:105742. [PMID: 36507221 PMCID: PMC9726650 DOI: 10.1016/j.isci.2022.105742] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/03/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022] Open
Abstract
Patients with severe COVID-19 exhibit a cytokine storm characterized by greatly elevated levels of cytokines. Despite this, the interferon (IFN) response is delayed, contributing to disease progression. Here, we report that SARS-CoV-2 excessively generates small viral RNAs (svRNAs) encoding exact 5' ends of positive-sense genes in human cells in vitro and ex vivo, whereas endemic human coronaviruses (OC43 and 229E) produce significantly fewer similar svRNAs. SARS-CoV-2 5' end svRNAs are RIG-I agonists and induce the IFN-β response in the later stages of infection. The first 60-nt ends bearing duplex structures and 5'-triphosphates are responsible for immune-stimulation. We propose that RIG-I activation by accumulated SARS-CoV-2 5' end svRNAs may contribute to later drive over-exuberant IFN production. Additionally, the differences in the amounts of svRNAs produced and the corresponding IFN response among CoV strains suggest that lower svRNA production during replication may correlate with the weaker immune response seen in less pathogenic CoVs.
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Affiliation(s)
- Yasuha Arai
- Department of Infectious Diseases, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Itaru Yamanaka
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Toru Okamoto
- Institute for Advanced Co-Creation Studies, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Ayana Isobe
- Department of Infectious Diseases, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Naomi Nakai
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Naoko Kamimura
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Tatsuya Suzuki
- Institute for Advanced Co-Creation Studies, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan
| | - Tomo Daidoji
- Department of Infectious Diseases, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | - Takao Ono
- SANKEN, Osaka University, Osaka 567-0047, Japan
| | - Takaaki Nakaya
- Department of Infectious Diseases, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
| | | | - Daisuke Okuzaki
- Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Osaka 565-0871, Japan,Single Cell Genomics, Human Immunology, WPI Immunology Frontier Research Center, Osaka University, Osaka 565-0871, Japan
| | - Yohei Watanabe
- Department of Infectious Diseases, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan,Corresponding author
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2
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Hartley NJ, Grenzer J, Huang L, Inubushi Y, Kamimura N, Katagiri K, Kodama R, Kon A, Lu W, Makita M, Matsuoka T, Nakajima S, Ozaki N, Pikuz T, Rode A, Sagae D, Schuster AK, Tono K, Voigt K, Vorberger J, Yabuuchi T, McBride EE, Kraus D. Erratum: Using Diffuse Scattering to Observe X-Ray-Driven Nonthermal Melting [Phys. Rev. Lett. 126, 015703 (2021)]. Phys Rev Lett 2022; 128:169901. [PMID: 35522523 DOI: 10.1103/physrevlett.128.169901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Indexed: 06/14/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.126.015703.
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3
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Rigon G, Albertazzi B, Pikuz T, Mabey P, Bouffetier V, Ozaki N, Vinci T, Barbato F, Falize E, Inubushi Y, Kamimura N, Katagiri K, Makarov S, Manuel MJE, Miyanishi K, Pikuz S, Poujade O, Sueda K, Togashi T, Umeda Y, Yabashi M, Yabuuchi T, Gregori G, Kodama R, Casner A, Koenig M. Micron-scale phenomena observed in a turbulent laser-produced plasma. Nat Commun 2021; 12:2679. [PMID: 33976145 PMCID: PMC8113596 DOI: 10.1038/s41467-021-22891-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 03/29/2021] [Indexed: 11/09/2022] Open
Abstract
Turbulence is ubiquitous in the universe and in fluid dynamics. It influences a wide range of high energy density systems, from inertial confinement fusion to astrophysical-object evolution. Understanding this phenomenon is crucial, however, due to limitations in experimental and numerical methods in plasma systems, a complete description of the turbulent spectrum is still lacking. Here, we present the measurement of a turbulent spectrum down to micron scale in a laser-plasma experiment. We use an experimental platform, which couples a high power optical laser, an x-ray free-electron laser and a lithium fluoride crystal, to study the dynamics of a plasma flow with micrometric resolution (~1μm) over a large field of view (>1 mm2). After the evolution of a Rayleigh–Taylor unstable system, we obtain spectra, which are overall consistent with existing turbulent theory, but present unexpected features. This work paves the way towards a better understanding of numerous systems, as it allows the direct comparison of experimental results, theory and numerical simulations. Turbulence effects explored use macroscale systems in general. Here the authors generate a turbulent plasma using laser irradiation of a solid target and study the dynamics of the plasma flow at the micron-scale by using scattering of an XFEL beam.
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Affiliation(s)
- G Rigon
- LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France.
| | - B Albertazzi
- LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France
| | - T Pikuz
- Institute for Open and Transdisciplinary Research Initiative, Osaka University, Osaka, Japan.,Joint Institute for High Temperatures RAS, Moscow, Russia
| | - P Mabey
- LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France
| | - V Bouffetier
- Université de Bordeaux-CNRS-CEA, CELIA, UMR 5107, Talence, France
| | - N Ozaki
- Graduate School of Engineering, Osaka University, Osaka, Japan.,Institute of Laser Engineering, Osaka University, Suita, Osaka, Japan
| | - T Vinci
- LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France
| | - F Barbato
- Université de Bordeaux-CNRS-CEA, CELIA, UMR 5107, Talence, France
| | | | - Y Inubushi
- Japan Synchrotron Radiation Research Institute, Hyogo, Japan.,RIKEN SPring-8 Center, Hyogo, Japan
| | - N Kamimura
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - K Katagiri
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - S Makarov
- Joint Institute for High Temperatures RAS, Moscow, Russia.,Department of Physics of accelerators and radiation medicine, Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
| | - M J-E Manuel
- General Atomics, Inertial Fusion Technologies, San Diego, CA, USA
| | | | - S Pikuz
- Joint Institute for High Temperatures RAS, Moscow, Russia.,National Research Nuclear University 'MEPhi', Moscow, Russia
| | - O Poujade
- CEA-DAM, DIF, Arpajon, France.,Université Paris-Saclay, CEA, LMCE, Bruyères-le-Châtel, France
| | - K Sueda
- RIKEN SPring-8 Center, Hyogo, Japan
| | - T Togashi
- Japan Synchrotron Radiation Research Institute, Hyogo, Japan.,RIKEN SPring-8 Center, Hyogo, Japan
| | - Y Umeda
- Graduate School of Engineering, Osaka University, Osaka, Japan.,Institute for Planetary Materials, Okayama University, Tottori, Japan
| | - M Yabashi
- Japan Synchrotron Radiation Research Institute, Hyogo, Japan.,RIKEN SPring-8 Center, Hyogo, Japan
| | - T Yabuuchi
- Japan Synchrotron Radiation Research Institute, Hyogo, Japan.,RIKEN SPring-8 Center, Hyogo, Japan
| | - G Gregori
- Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - R Kodama
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - A Casner
- Université de Bordeaux-CNRS-CEA, CELIA, UMR 5107, Talence, France.,CEA-CESTA, 15 avenue des Sablières, CS 60001, 33116 Le Barp Cedex, France
| | - M Koenig
- LULI, CNRS, CEA, École Polytechnique, UPMC, Univ Paris 06: Sorbonne Universités, Institut Polytechnique de Paris, F-91128 Palaiseau cedex, France.,Graduate School of Engineering, Osaka University, Osaka, Japan
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4
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Hartley NJ, Grenzer J, Huang L, Inubushi Y, Kamimura N, Katagiri K, Kodama R, Kon A, Lu W, Makita M, Matsuoka T, Nakajima S, Ozaki N, Pikuz T, Rode AV, Sagae D, Schuster AK, Tono K, Voigt K, Vorberger J, Yabuuchi T, McBride EE, Kraus D. Using Diffuse Scattering to Observe X-Ray-Driven Nonthermal Melting. Phys Rev Lett 2021; 126:015703. [PMID: 33480771 DOI: 10.1103/physrevlett.126.015703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 10/09/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
We present results from the SPring-8 Angstrom Compact free electron LAser facility, where we used a high intensity (∼10^{20} W/cm^{2}) x-ray pump x-ray probe scheme to observe changes in the ionic structure of silicon induced by x-ray heating of the electrons. By avoiding Laue spots in the scattering signal from a single crystalline sample, we observe a rapid rise in diffuse scattering and a transition to a disordered, liquidlike state with a structure significantly different from liquid silicon. The disordering occurs within 100 fs of irradiation, a timescale that agrees well with first principles simulations, and is faster than that predicted by purely inertial behavior, suggesting that both the phase change and disordered state reached are dominated by Coulomb forces. This method is capable of observing liquid scattering without masking signal from the ambient solid, allowing the liquid structure to be measured throughout and beyond the phase change.
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Affiliation(s)
- N J Hartley
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - J Grenzer
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - L Huang
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Y Inubushi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - N Kamimura
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - K Katagiri
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - R Kodama
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
- Photon Pioneers Center, Osaka University, Suita, Osaka 565-0087, Japan
| | - A Kon
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - W Lu
- European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - M Makita
- European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany
| | - T Matsuoka
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - S Nakajima
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - N Ozaki
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
- Photon Pioneers Center, Osaka University, Suita, Osaka 565-0087, Japan
| | - T Pikuz
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - A V Rode
- Laser Physics Centre, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
| | - D Sagae
- Graduate School of Engineering, Osaka University, Suita, Osaka 565-0087, Japan
| | - A K Schuster
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
- Technische Universität Dresden, 01062 Dresden, Germany
| | - K Tono
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - K Voigt
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
- Technische Universität Dresden, 01062 Dresden, Germany
| | - J Vorberger
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - T Yabuuchi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - E E McBride
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - D Kraus
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
- Institut für Physik, Universität Rostock, Albert-Einstein-Straße 23, 18059 Rostock, Germany
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5
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Hirose K, Aoki M, Sato M, Akimoto H, Hatayama Y, Kawaguchi H, Hashimoto Y, Imai A, Kamimura N, Fujioka I, Tanaka M, Ohyama C, Takai Y. A Retrospective Analysis of the Relationship Between Prescribed Dose and Dosimetric Advantage Taken by Intraoperative Built Custom Linked Seeds in Iodine-125 Prostate Brachytherapy. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1261] [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: 10/20/2022]
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6
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Shimodera S, Kawamura A, Fujita H, Iwagawa C, Akamatsu M, Suga Y, Doi E, Fuji M, Gibo N, Kakeda K, Kamimura N, Furukawa T, Morinobu S. EPA-1764 – Effect of depression-related somatic pain on treatment satisfaction and daily living functions. Eur Psychiatry 2014. [DOI: 10.1016/s0924-9338(14)78893-5] [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: 12/01/2022] Open
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7
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Fukuhara Y, Kamimura N, Nakajima M, Hishiyama S, Hara H, Kasai D, Tsuji Y, Narita-Yamada S, Nakamura S, Katano Y, Fujita N, Katayama Y, Fukuda M, Kajita S, Masai E. Discovery of pinoresinol reductase genes in sphingomonads. Enzyme Microb Technol 2013. [DOI: 10.1016/j.enzmictec.2012.10.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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8
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Koie T, Ohyama C, Yamamoto H, Hatakeyama S, Kudoh S, Yoneyama T, Hashimoto Y, Kamimura N. Minimum incision endoscopic radical cystectomy in patients with malignant tumors of the urinary bladder: Clinical and oncological outcomes at a single institution. Eur J Surg Oncol 2012; 38:1101-5. [DOI: 10.1016/j.ejso.2012.07.115] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 05/20/2012] [Accepted: 07/19/2012] [Indexed: 10/28/2022] Open
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9
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Shimodera S, Kawamura A, Fujita H, Suga Y, Kamimura N, Inoue S, Furukawa T. P-529 - Physical pain and depression: a survey in japanese patients and physicians. Eur Psychiatry 2012. [DOI: 10.1016/s0924-9338(12)74696-5] [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] Open
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10
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Hatanaka F, Matsubara C, Myung J, Yoritaka T, Kamimura N, Tsutsumi S, Kanai A, Suzuki Y, Aburatani H, Sugano S, Takumi T. Genome-wide profiling of the core clock protein BMAL1 targets reveals strict relationship with metabolism. Neurosci Res 2011. [DOI: 10.1016/j.neures.2011.07.226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Mizutani A, Koinuma D, Tsutsumi S, Kamimura N, Morikawa M, Suzuki HI, Imamura T, Miyazono K, Aburatani H. Cell type-specific target selection by combinatorial binding of Smad2/3 proteins and hepatocyte nuclear factor 4alpha in HepG2 cells. J Biol Chem 2011; 286:29848-60. [PMID: 21646355 PMCID: PMC3191026 DOI: 10.1074/jbc.m110.217745] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [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] [Indexed: 12/17/2022] Open
Abstract
Specific regulation of target genes by transforming growth factor-β (TGF-β) in a given cellular context is determined in part by transcription factors and cofactors that interact with the Smad complex. In this study, we determined Smad2 and Smad3 (Smad2/3) binding regions in the promoters of known genes in HepG2 hepatoblastoma cells, and we compared them with those in HaCaT epidermal keratinocytes to elucidate the mechanisms of cell type- and context-dependent regulation of transcription induced by TGF-β. Our results show that 81% of the Smad2/3 binding regions in HepG2 cells were not shared with those found in HaCaT cells. Hepatocyte nuclear factor 4α (HNF4α) is expressed in HepG2 cells but not in HaCaT cells, and the HNF4α-binding motif was identified as an enriched motif in the HepG2-specific Smad2/3 binding regions. Chromatin immunoprecipitation sequencing analysis of HNF4α binding regions under TGF-β stimulation revealed that 32.5% of the Smad2/3 binding regions overlapped HNF4α bindings. MIXL1 was identified as a new combinatorial target of HNF4α and Smad2/3, and both the HNF4α protein and its binding motif were required for the induction of MIXL1 by TGF-β in HepG2 cells. These findings generalize the importance of binding of HNF4α on Smad2/3 binding genomic regions for HepG2-specific regulation of transcription by TGF-β and suggest that certain transcription factors expressed in a cell type-specific manner play important roles in the transcription regulated by the TGF-β-Smad signaling pathway.
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Affiliation(s)
- Anna Mizutani
- From the Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
| | - Daizo Koinuma
- From the Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
| | - Shuichi Tsutsumi
- the Genome Science Division, Research Center for Advanced Science and Technology, University of Tokyo, Meguro-ku, Tokyo 153-8904, and
| | - Naoko Kamimura
- the Genome Science Division, Research Center for Advanced Science and Technology, University of Tokyo, Meguro-ku, Tokyo 153-8904, and
| | - Masato Morikawa
- From the Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
| | - Hiroshi I. Suzuki
- From the Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
| | - Takeshi Imamura
- the Division of Biochemistry, Cancer Institute of the Japanese Foundation for Cancer Research, Koto-ku, Tokyo 135-8550, Japan
| | - Kohei Miyazono
- From the Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
- To whom correspondence should be addressed. Tel.: 81-3-5841-3356; Fax: 81-3-5841-3354; E-mail:
| | - Hiroyuki Aburatani
- the Genome Science Division, Research Center for Advanced Science and Technology, University of Tokyo, Meguro-ku, Tokyo 153-8904, and
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12
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Koie T, Yamamoto H, Hatakeyama S, Kudoh S, Yoneyama T, Hashimoto Y, Kamimura N, Ohyama C. Minimum incision endoscopic radical prostatectomy: clinical and oncological outcomes at a single institute. Eur J Surg Oncol 2011; 37:805-10. [PMID: 21782374 DOI: 10.1016/j.ejso.2011.06.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 05/12/2011] [Accepted: 06/14/2011] [Indexed: 11/27/2022] Open
Abstract
AIMS The objective of this study was to investigate the clinical and oncological outcomes of prostatectomy patients undergoing minimum incision endoscopic radical prostatectomy (MIE-RP). METHODS Between September 2005 and May 2010, 541 patients underwent MIE-RP with bilateral lymphadenectomy for clinically localized prostate cancer at Hirosaki University Hospital. The present retrospective study enrolled 375 patients who had not received neoadjuvant or adjuvant therapy. MIE-RP was performed through a 6-cm suprapubic midline incision. A 30° laparoscope was conveniently positioned on the head side of the patient for precise observation and monitoring. RESULTS The median operating time was 119 min, and the estimated blood loss was 900 ml. The most frequent perioperative complication was leakage from the vesicourethral anastomosis (6.7%), and rectal injury occurred in 1.0%. Overall, 31.2% of the patients had a positive surgical margin, including 11.1% with pT2, 52.9% with pT3 and 100% with pT4 diseases. The post-operative median follow-up period was 40.5 months (range, 2-56.5 months). The 5-year PSA-free survival rate was 71.6%. In multivariate analysis, high-risk patients (according to the D'Amico risk criteria), pathological T stage and positive surgical margins were identified as independent predictors of PSA-free survival. The limitations of this study included a retrospective study, relatively short follow-up period and single-institution nature of the study. CONCLUSIONS MIE-RP is a safe and minimally invasive procedure that may represent a reliable alternative to laparoscopic and robotic-assisted RP.
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Affiliation(s)
- T Koie
- Department of Urology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki 036 8562, Japan
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Kamimura N, Kasai D, Senda T, Katayama Y, Fukuda M, Masai E. LigR, a LysR-type transcriptional regulator, controls expression of the protocatechuate 4,5-cleavage pathway genes in Sphingobium sp. strain SYK-6. J Biotechnol 2010. [DOI: 10.1016/j.jbiotec.2010.09.088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Koinuma D, Tsutsumi S, Kamimura N, Imamura T, Aburatani H, Miyazono K. Promoter-wide analysis of Smad4 binding sites in human epithelial cells. Cancer Sci 2009; 100:2133-42. [PMID: 19686287 DOI: 10.1111/j.1349-7006.2009.01299.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Smad4, the common partner Smad, is a key molecule in transforming growth factor-beta (TGF-beta) family signaling. Loss of Smad4 expression is found in several types of cancer, including pancreatic cancer and colon cancer, and is related to carcinogenesis. Here we identified Smad4 binding sites in the promoter regions of over 25 500 known genes by chromatin immunoprecipitation on a microarray (ChIP-chip) in HaCaT human keratinocytes. We identified 925 significant Smad4 binding sites. Approximately half of the identified sites overlapped the binding regions of Smad2 and Smad3 (Smad2/3, receptor-regulated Smads in TGF-beta signaling), while the rest of the regions appeared dominantly occupied by Smad4 even when a different identification threshold for Smad2/3 binding regions was used. Distribution analysis showed that Smad4 was found in the regions relatively distant from the transcription start sites, while Smad2/3 binding regions were more often present near the transcription start sites. Motif analysis also revealed that activator protein 1 (AP-1) sites were especially enriched in the sites common to Smad2/3 and Smad4 binding regions. In contrast, GC-rich motifs were enriched in Smad4-dominant binding regions. We further determined putative target genes of Smad4 whose expression was regulated by TGF-beta. Our findings revealed some general characteristics of Smad4 binding regions, and provide resources for examining the role of Smad4 in epithelial cells and cancer pathogenesis.
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Affiliation(s)
- Daizo Koinuma
- Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo
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15
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Koie T, Yamamoto H, Okamoto A, Hatakeyama S, Momose A, Iwabuchi I, Yoneyama T, Hashimoto Y, Kamimura N, Ohyama C, Saijo Y. Feasibility and efficacy of gemcitabine and carboplatin neoadjuvant chemotherapy in muscle-invasive bladder cancer. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e16100] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e16100 Background: The neoadjuvant M-VAC followed by radical cystectomy for muscle-invasive bladder cancer has improved survival compared to radical cystectomy alone. Nevertheless, M-VAC has been associated with severe toxicity. The objective of this retrospective study was to evaluate the objective response rate, the impact on overall survival, disease-free survival, disease-free survival and toxicity adverse events of gemcitabine and carboplatin (GC) neoadjuvant chemotherapy in patients with locally advanced bladder cancer. Methods: We reviewed the clinical and pathological data of 140 patients who underwent radical cystectomy and bilateral pelvic lymphadenectomy for T2N0M0 to T4aN0M0 bladder cancer at our institution between January 2001 and August 2008. Seventy patients were treated with neoadjuvant GC followed by cystectomy between March 2005 and August 2008 (GC group), and 70 patients were treated with cystectomy alone between January 2001 and May 2007 (cystectomy alone group). In the GC group, the patients received 2 courses of GC therapy consisted of 800mg/m2 gemcitabine on days 1, 8, and 15 and carboplatin (AUC 4) on day 2. The primary endpoint was the objective response rate, and the secondary endpoints were overall survival, cancer-specific survival, disease free survival, and toxicity. Results: Fifteen patients (23.8%) had a complete response and 26 patients (41.3%) had a partial response in the GC group. At a mean follow-up period of 26.7 months, the overall survival was 85.0% in the GC group and 47.8% in the cystectomy alone group (p = 0.003). The cancer-specific survival was 78.4% in the GC group and 44.6% in the cystectomy alone group (p = 0.0018). The disease-free survival was 82.9% in the GC group and 35.7% in the cystectomy alone group (p = 0.0001). Hematologic toxicities were the main adverse events. Grade 3/4 neutropenia occurred in 26 patients (37.1%) and thrombocytopenia in 15 (21.4%). There was no grade 3/4 gastrointestinal toxicity and no renal function abnormalities. Conclusions: Although this is not a randomized study, the GC neoadjuvant therapy followed by radical cystectomy is feasible and may be associated with improved survival among patients with muscle-invasive bladder cancer. A randomized trial is warranted. No significant financial relationships to disclose.
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Affiliation(s)
- T. Koie
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - H. Yamamoto
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - A. Okamoto
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - S. Hatakeyama
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - A. Momose
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - I. Iwabuchi
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - T. Yoneyama
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y. Hashimoto
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - N. Kamimura
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - C. Ohyama
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Y. Saijo
- Hirosaki University Graduate School of Medicine, Hirosaki, Japan
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16
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Kawase T, Ohki R, Shibata T, Tsutsumi S, Kamimura N, Inazawa J, Ohta T, Ichikawa H, Aburatani H, Tashiro F, Taya Y. PH domain-only protein PHLDA3 is a p53-regulated repressor of Akt. Cell 2009; 136:535-50. [PMID: 19203586 DOI: 10.1016/j.cell.2008.12.002] [Citation(s) in RCA: 176] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Revised: 09/01/2008] [Accepted: 12/03/2008] [Indexed: 12/17/2022]
Abstract
p53 And Akt are critical players regulating tumorigenesis with opposite effects: whereas p53 transactivates target genes to exert its function as a tumor suppressor, Akt phosphorylates its substrates and transduces downstream survival signals. In addition, p53 and Akt negatively regulate each other to balance survival and death signals within a cell. We now identify PHLDA3 as a p53 target gene that encodes a PH domain-only protein. We find that PHLDA3 competes with the PH domain of Akt for binding of membrane lipids, thereby inhibiting Akt translocation to the cellular membrane and activation. Ablation of endogenous PHLDA3 results in enhanced Akt activity and decrease of p53-dependent apoptosis. We also demonstrate the suppression of anchorage-independent cell growth by PHLDA3. Loss of the PHLDA3 genomic locus was frequently observed in primary lung cancers, suggesting a role of PHLDA3 in tumor suppression. Our results reveal a new mode of coordination between the p53 and Akt pathways.
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Affiliation(s)
- Tatsuya Kawase
- Radiobiology Division, National Cancer Center Research Institute, Tokyo, Japan
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17
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Midorikawa Y, Yamamoto S, Tsuji S, Kamimura N, Ishikawa S, Igarashi H, Makuuchi M, Kokudo N, Sugimura H, Aburatani H. Allelic imbalances and homozygous deletion on 8p23.2 for stepwise progression of hepatocarcinogenesis. Hepatology 2009; 49:513-22. [PMID: 19105209 DOI: 10.1002/hep.22698] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
UNLABELLED Early hepatocellular carcinoma (eHCC) originates from the hepatocytes of chronic liver disease and develops into classical hepatocellular carcinoma (HCC). To identify sequential genetic changes in multistep hepatocarcinogenesis, we analyzed molecular karyotypes using oligonucleotide genotyping 50K arrays. First, 1q21.3-44 gain and loss of heterozygosity (LOH) on 1p36.21-36.32 and 17p13.1-13.3 were frequently observed in eHCC, but not in chronic liver diseases, suggesting that such chromosomal aberrations are early, possibly causative events in liver cancer. Next, we detected 25 chromosomal loci associated with liver cancer progression in five HCCs with nodule-in-nodule appearance, in which the inner nodule develops within eHCC lesion. Using these chromosomal regions as independent variables, decision tree analysis was applied on 14 early and 25 overt HCCs, and extracted combination of chromosomal gains on 5q11.1-35.3 and 8q11.1-24.3 and LOH on 4q11-34.3 and 8p11.21-23.3 as distinctive attributes, which can classify early and overt HCCs recursively. In these four altered regions identified as late events of hepatocarcinogenesis, two tumors in 32 overt HCCs analyzed in the present study and one in a set of independent samples of 36 overt HCCs in our previous study harbored a homozygous deletion near the CSMD1 locus on 8p23.2. CSMD1 messenger RNA expression was decreased in HCC without 8p23.2 deletion, possibly due to hypermethylation of the CpG islands in its promoter region. CONCLUSION 1q gain and 1p and 17p LOH are early molecular events, whereas gains in 5q and 8q and LOH on 4q and 8p only occur in advanced HCC, and inactivation of the putative suppressor gene, CSMD1, may be the key event in progression of liver cancer.
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Affiliation(s)
- Yutaka Midorikawa
- Division of Genome Science, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
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18
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Midorikawa Y, Yamamoto S, Ishikawa S, Kamimura N, Igarashi H, Sugimura H, Makuuchi M, Aburatani H. Molecular karyotyping of human hepatocellular carcinoma using single-nucleotide polymorphism arrays. Oncogene 2006; 25:5581-90. [PMID: 16785998 DOI: 10.1038/sj.onc.1209537] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Genomic amplification of oncogenes and inactivation of suppressor genes are critical in the pathogenesis of human cancer. To identify chromosomal alterations associated with hepatocarcinogenesis, we performed allelic gene dosage analysis on 36 hepatocellular carcinomas (HCCs). Data from high-density single-nucleotide polymorphism arrays were analysed using the Genome Imbalance Map (GIM) algorithm, which simultaneously detects DNA copy number alterations and loss of heterozygosity (LOH) events. Genome Imbalance Map analysis identified allelic imbalance regions, including uniparental disomy, and predicted the coexistence of a heterozygous population of cancer cells. We observed that gains of 1q, 5p, 5q, 6p, 7q, 8q, 17q and 20q, and LOH of 1p, 4q, 6q, 8p, 10q, 13q, 16p, 16q and 17p were significantly associated with HCC. On 6q24-25, which contains imprinting gene clusters, we observed reduced levels of PLAGL1 expression owing to loss of the unmethylated allele. Finally, we integrated the copy number data with gene expression intensity, and found that genome dosage is correlated with alteration in gene expression. These observations indicated that high-resolution GIM analysis can accurately determine the localizations of genomic regions with allelic imbalance, and when integrated with epigenetic information, a mechanistic basis for inactivation of a tumor suppressor gene in HCC was elucidated.
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Affiliation(s)
- Y Midorikawa
- Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan
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19
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Midorikawa Y, Tsutsumi S, Nishimura K, Kamimura N, Kano M, Sakamoto H, Makuuchi M, Aburatani H. Distinct chromosomal bias of gene expression signatures in the progression of hepatocellular carcinoma. Cancer Res 2004; 64:7263-70. [PMID: 15492245 DOI: 10.1158/0008-5472.can-04-1275] [Citation(s) in RCA: 51] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
To identify the chromosomal aberrations associated with the progression of liver cancer, we applied expression imbalance map analysis to gene expression data from 31 hepatocellular carcinomas and 19 noncancerous tissues. Expression imbalance map analysis, which detects mRNA expression imbalance correlated with chromosomal regions, showed that expression gains of 1q21-23 (74%), 8q13-21 (48%), 12q23-24 (41%), 17q12-21(48%), 17q25 (25%), and 20q11 (22%) and losses of 4q13 (48%), 8p12-21 (32%), 13q14 (32%), and 17p13 (29%) were significantly associated with hepatocellular carcinoma. Most regions with altered expression identified by expression imbalance map were also identified in previous reports using comparative genomic hybridization. We demonstrated chromosomal copy number gain in 1q21-23 and loss in 17p13 by genomic quantitative PCR, suggesting that gene expression profiles reflect chromosomal alterations. Furthermore, expression imbalance map analysis revealed that more poorly differentiated hepatocellular carcinoma contain more chromosomal alterations, which are accumulated in a stepwise manner in the course of hepatocellular carcinoma progression: expression imbalance of 1q, 8p, 8q, and 17p occur as early events in hepatocarcinogenesis, and 12q, 17q25 and 20q occur as later events. In particular, expression gain of 17q12-21 and loss of 4q were seen to accumulate constantly through the dedifferentiation process. Our data suggest that gene expression profiles are subject to chromosomal bias and that expression imbalance map can correlate gene expression to gene loci with high resolution and sensitivity.
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Affiliation(s)
- Yutaka Midorikawa
- Genome Science Division, Intelligent Cooperative Systems Division, Research Center for Advanced Science and Technology, and Hepato-Biliary-Pancreatic Surgery Division, The University of Tokyo, Tokyo, USA
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20
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Kondoh T, Kamimura N, Tsuru A, Matsumoto T, Matsuzaka T, Moriuchi H. A case of Schinzel-Giedion syndrome complicated with progressive severe gingival hyperplasia and progressive brain atrophy. Pediatr Int 2001; 43:181-4. [PMID: 11285076 DOI: 10.1046/j.1442-200x.2001.01348.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- T Kondoh
- Department of Pediatrics, Nagasaki University School of Medicine Nagasaki University, Nagasaki, Japan.
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21
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Wu J, Kamimura N, Takeo T, Suga S, Wakui M, Maruyama T, Mikoshiba K. 2-Aminoethoxydiphenyl borate modulates kinetics of intracellular Ca(2+) signals mediated by inositol 1,4,5-trisphosphate-sensitive Ca(2+) stores in single pancreatic acinar cells of mouse. Mol Pharmacol 2000; 58:1368-74. [PMID: 11093775 DOI: 10.1124/mol.58.6.1368] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Regulation of the kinetics of intracellular Ca(2+) signals with a novel, membrane-penetrable, inositol 1,4,5-trisphosphate (InsP(3)) receptor/Ca(2+) channel modulator, 2-amino-ethoxydiphenyl borate (2APB), has been investigated using patch-clamp, whole-cell recording to monitor Ca(2+)-activated Cl(-) currents in single isolated pancreatic acinar cells. 2APB itself fails to evoke a detectable current response but it dramatically changes the kinetics of agonist-induced Ca(2+) release from pulsatile spikes to long-lasting, huge Ca(2+) waves, suggesting that 2APB coordinates local Ca(2+) release to generate global Ca(2+) signals. The regulation by 2APB can be elicited by internal perfusion of InsP(3) in a concentration-dependent manner, indicating that this regulation is not mediated through membrane receptors or G protein signal transduction. The InsP(3) receptor blocker heparin, but not the ryanodine-sensitive receptor blockers ruthenium red or ryanodine, abolishes 2APB-mediated regulation of Ca(2+) release. This results also suggest that 2APB effects are mediated through InsP(3) receptors. 2APB substantially modifies single inward Cl(-) current pulse evoked by the photolytic release of caged InsP(3) but not by caged Ca(2+). These data indicate that 2APB-induced regulation is mediated neither by Ca(2+)-induced Ca(2+) release nor by affecting Cl(-) channel activity directly. We conclude that 2APB regulates the kinetics of intracellular Ca(2+) signals, represented as the change in the Ca(2+) oscillation patterns from brief pulsatile spikes to huge, long-lasting Ca(2+) waves. Moreover, this regulation seems to be mediated through InsP(3)-sensitive Ca(2+) pools. 2APB may act as a novel, useful pharmacological tool to study the genesis of intracellular Ca(2+) signals.
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Affiliation(s)
- J Wu
- Department of Physiology, Hirosaki University School of Medicine, Hirosaki, Japan.
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22
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Chadani Y, Kondoh T, Kamimura N, Matsumoto T, Matsuzaka T, Kobayashi O, Kondo-Iida E, Kobayashi K, Nonaka I, Toda T. Walker-Warburg syndrome is genetically distinct from Fukuyama type congenital muscular dystrophy. J Neurol Sci 2000; 177:150-3. [PMID: 10980312 DOI: 10.1016/s0022-510x(00)00328-2] [Citation(s) in RCA: 7] [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: 11/16/2022]
Abstract
A female patient who fulfilled the diagnostic criteria of Walker-Warburg syndrome had muscle biopsy finding of muscular dystrophy. There was normal expression of merosin (laminin alpha2 chain) and dystrophin and only slightly reduced dystrophin-associated glycoprotein expression. On genetic analysis, she had no specific haplotype, the common mutation of 3kb insertion, or point mutations in the Fukuyama-type congenital muscular dystrophy gene, suggesting that the two diseases are not genetically identical.
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Affiliation(s)
- Y Chadani
- Department of Pediatrics, Nagasaki University School of Medicine, Nagasaki, Japan.
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23
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Suga S, Kanno T, Ogawa Y, Takeo T, Kamimura N, Wakui M. cAMP-independent decrease of ATP-sensitive K+ channel activity by GLP-1 in rat pancreatic beta-cells. Pflugers Arch 2000; 440:566-72. [PMID: 10958340 DOI: 10.1007/s004240000279] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/26/2022]
Abstract
Using the patch-clamp method, we studied the mechanism of depolarization of rat pancreatic beta-cells induced by glucagon-like peptide 1 (7-36) amide (GLP-1). GLP-1 caused depolarization in a concentration-dependent manner (0.2-100 nM). Exendin (9-39) amide, a GLP-1 receptor antagonist, prevented the GLP-1-induced depolarization. GLP-1 reduced tolbutamide-sensitive membrane currents evoked by voltage ramps from -90 to -50 mV, recorded in the perforated whole-cell configuration, suggesting that GLP-1 decreased the activity of the ATP-sensitive K+ channel (KATP). This GLP-1 effect was prevented by exendin (9-39) amide. In cells treated with Rp-cAMPS, an inhibitor of the cAMP-dependent protein kinase (PKA), GLP-1 still caused depolarization and reduced the whole-cell membrane current through KATP. Examined in the cell-attached configuration, 20 nM GLP-1, applied out of the patch, had little effect on KATP activity. In the inside-out configuration, the open time probability and the single-channel conductance of KATP in the absence of ATP inside the membrane were unaffected by the presence of 20 nM GLP-1 in the pipette. In both conditions, application of ATP to the inside of the membrane reduced KATP activity. The half-maximal concentrations (ki) of ATP were 11.6 microM without and 5.6 microM with 20 nM GLP-1 in the pipette (P<0.05). The values of the Hill coefficient (h) were 1.03 without and 1.01 with GLP-1. We conclude that GLP-1 reduces KATP activity by elevating the sensitivity of KATP to ATP, resulting in depolarization of pancreatic beta-cells. This GLP-1 action is independent of the cAMP signalling pathway.
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Affiliation(s)
- S Suga
- Department of Physiology, Hirosaki University School of Medicine, Japan
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24
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Kamimura N, Suga S, Nakano K, Kanno T, Takeo T, Wakui M. Protein kinase C-dependent inhibition of K+ currents in noradrenaline-induced depolarization of smooth muscle of guinea-pig vas deferens. Exp Physiol 2000; 85:37-42. [PMID: 10662890] [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: 02/15/2023]
Abstract
Ionic mechanisms and signal transduction underlying noradrenaline (NA)-induced depolarization in single smooth muscle cells of guinea-pig vas deferens were studied. NA caused depolarization followed by action potentials through activation of 1-adrenoceptors. In the presence of nifedipine, no action potential was generated, and the magnitude of the depolarization depended on the concentration of NA (0.1-100 micrometer). NA, through 1-adrenoceptor activation, reduced the magnitude of membrane currents in response to voltage ramp pulses from -90 to -30 mV in a concentration-dependent manner. The reversal potential of the current inhibited by NA changed proportionally to the change in the equilibrium potential of K+, suggesting that NA inhibited K+ channel activity. Treatment of cells with GDPS, an inhibitor of G proteins, or bisindolylmaleimide (BIM), a selective protein kinase C (PKC) inhibitor, prevented the NA inhibition of the currents. Application of 12-O-tetradecanoylphorbol 13-acetate (TPA), an activator of PKC, mimicked the effect of NA. It is suggested that in the smooth muscle of guinea-pig vas deferens, activation of 1-adrenoceptors and the subsequent activation of PKC led to inhibition of K+ currents, which is responsible for the depolarization induced by NA.
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Affiliation(s)
- N Kamimura
- Department of Physiology, Hirosaki University School of Medicine, Hirosaki 036-8562, Japan
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25
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Kimura M, Osanai T, Okumura K, Suga S, Kanno T, Kamimura N, Horiba N, Wakui M. Involvement of phosphorylation of beta-subunit in cAMP-dependent activation of L-type Ca2+ channel in aortic smooth muscle-derived A7r5 cells. Cell Signal 2000; 12:63-70. [PMID: 10676849 DOI: 10.1016/s0898-6568(99)00068-6] [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: 11/27/2022]
Abstract
We investigated the effect of intracellular cAMP on the gating kinetics of L-type Ca2+ channel in an A7r5 smooth muscle-derived cell line using the whole-cell patch-clamp technique. Application of dibutyryl cyclic AMP (db-cAMP) to the cell increased the magnitude of Ca2+ currents through L-type Ca2+ channels (I(Ca)), and shifted the current-voltage relationship (I-V curve) for I(Ca) to the left. The magnitudes of maximum I(Ca) were 14.1 +/- 0.7 before and 16.0 +/- 1.1 pA/pF after application of 1 mM db-cAMP (P < 0.05). The values of the half-activation potential (V(1/2)) of I(Ca), estimated from activation curves, were -7.0 +/- 0.8 mV before and -10.8 +/- 1.0 mV after application of db-cAMP (P < 0.05). In cells pretreated with 10 microM Rp-cAMPS (a specific inhibitor of PKA), db-cAMP affected neither the I-V curve nor the activation curve for I(Ca). In cells pretreated with the antisense oligonucleotide for the beta-subunit of L-type Ca2+ channel, db-cAMP failed to enhance I(Ca) or alter the activation curve. On the other hand, in the cells pretreated with the nonsense oligonucleotide, application of db-cAMP caused an increase in magnitude of I(Ca) and shifted the activation curve to the left. Western blot analysis revealed that the pretreatment of cells with antisense oligonucleotide but nonsense oligonucleotide reduced the expression of the beta-subunit of the L-type Ca2+ channel. We conclude that the cAMP-dependent phosphorylation of the beta-subunit potentiates the voltage dependency of the activation kinetics of the L-type Ca2+ channel in A7r5 cells.
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Affiliation(s)
- M Kimura
- The Second Department of Internal Medicine, Hirosaki University School of Medicine, Japan
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26
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MacFarlane WM, Chapman JC, Shepherd RM, Hashmi MN, Kamimura N, Cosgrove KE, O'Brien RE, Barnes PD, Hart AW, Docherty HM, Lindley KJ, Aynsley-Green A, James RF, Docherty K, Dunne MJ. Engineering a glucose-responsive human insulin-secreting cell line from islets of Langerhans isolated from a patient with persistent hyperinsulinemic hypoglycemia of infancy. J Biol Chem 1999; 274:34059-66. [PMID: 10567373 DOI: 10.1074/jbc.274.48.34059] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Persistent hyperinsulinemic hypoglycemia of infancy (PHHI) is a neonatal disease characterized by dysregulation of insulin secretion accompanied by profound hypoglycemia. We have discovered that islet cells, isolated from the pancreas of a PHHI patient, proliferate in culture while maintaining a beta cell-like phenotype. The PHHI-derived cell line (NES2Y) exhibits insulin secretory characteristics typical of islet cells derived from these patients, i.e. they have no K(ATP) channel activity and as a consequence secrete insulin at constitutively high levels in the absence of glucose. In addition, they exhibit impaired expression of the homeodomain transcription factor PDX1, which is a key component of the signaling pathway linking nutrient metabolism to the regulation of insulin gene expression. To repair these defects NES2Y cells were triple-transfected with cDNAs encoding the two components of the K(ATP) channel (SUR1 and Kir6.2) and PDX1. One selected clonal cell line (NISK9) had normal K(ATP) channel activity, and as a result of changes in intracellular Ca(2+) homeostasis ([Ca(2+)](i)) secreted insulin within the physiological range of glucose concentrations. This approach to engineering PHHI-derived islet cells may be of use in gene therapy for PHHI and in cell engineering techniques for administering insulin for the treatment of diabetes mellitus.
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Affiliation(s)
- W M MacFarlane
- Department of Molecular Biology, University of Aberdeen, Institute of Medical Sciences, Aberdeen AB25 2ZD, United Kingdom
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27
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Abstract
PURPOSE To clarify the relation between quantitative electroencephalogram (EEG) findings and outcome following corpus callosotomy (CC). METHODS The degree of bilateral synchrony and morphologic similarity of spike-wave discharges was analyzed by using a cross-correlation analysis and the measurements of amplitude differences between bilateral homologous regions in 22 patients who underwent anterior CCs for intractable symptomatic generalized epilepsies (SGE; 17 patients) and frontal lobe epilepsy (five patients). RESULTS Interictal generalized synchronous spike-wave (GSSW) bursts in the SGE patients were disrupted and changed to unilateral spike-waves (USWs) in 11 patients and to bilaterally independent spike-waves (BISWs) in six. The USW group had better surgical outcome than the BISW group. Preoperatively, the USW group had significantly lower interhemispheric synchrony (IS) and fewer regional changes in the side leading in time and the side dominant for amplitude, suggesting unilaterally predominant epileptogenesis that triggered the secondary bilateral synchrony. Postoperatively, the BISW group had a more marked reduction in IS because of independent discharges from bilateral epileptogenic areas, and the USW group had a greater amplitude difference because of unilateralized spike-waves. In addition, an excellent surgical outcome was related to (a) the preoperative degree of the morphologic similarity of the bilateral spike-waves (only a small variation during a burst of spike-waves) and the few instances of regional changes in the side leading in time and in the side dominant for amplitude; and (b) to large postoperative amplitude differences. CONCLUSION Preoperative quantitative EEG analyses enabled us to predict the underlying conditions of epileptogenesis and the surgical outcomes in patients undergoing CC.
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Affiliation(s)
- T Matsuzaka
- Department of Pediatrics, Nagasaki University School of Medicine, Sakamoto, Japan.
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28
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Abstract
The effects of corticotropin-releasing factor (CRF) on the intracellular concentration of Ca2+ were studied in isolated single beta-cells of the rat islet. Immunohistochemical staining using CRF-receptor antibodies revealed the presence of both type 1 (CRF-R1) and type 2 (CRF-R2) receptors for CRF in the majority of islet cells. CRF (2 nmol/l) increased cytosolic Ca2+ concentration under 2.8 mmol/l glucose, dependent upon extracellular Ca2+. CRF caused depolarization of the cell membrane, which was followed by action potentials under 2.8 mmol/l glucose. The dose-response relationships of CRF-induced depolarization in the presence of 1 micromol/l nifedipine produced a bell-shaped curve, showing the peak response at 2 nmol/l. In the whole-cell patch-clamp recording, CRF enhanced Ca2+ currents through L-type Ca2+ channels in a dose-dependent manner similar to that for depolarization. In cells pretreated with Rp-deastereomer of adenosine cyclic 3',5'-phosphorothiolate (100 micromol/l), neither depolarization nor an increase in the Ca2+ current was caused by CRF at concentrations <2 nmol/l. In these cells, CRF at 20 nmol/l reduced the Ca2+ current. These results suggest that in single beta-cells of rat islets, CRF, through its own receptor, potentiates Ca2+ influx through the L-type Ca2+ channel by activation of the cAMP/protein kinase A signaling pathway. CRF at a high concentration also shows an inhibitory effect on the Ca2+ current through an unknown signaling pathway.
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Affiliation(s)
- T Kanno
- Department of Physiology, Hirosaki University School of Medicine, Japan.
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29
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Tominaga N, Kondoh T, Kamimura N, Matsumoto T, Matsuzaka T, Oshima K, Nishimura G, Tsuji Y. A case of megalocornea-mental retardation syndrome complicated with bilateral sensorineural hearing impairment. Pediatr Int 1999; 41:392-4. [PMID: 10453191 DOI: 10.1046/j.1442-200x.1999.01081.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- N Tominaga
- Department of Pediatrics, Nagasaki University School of Medicine, Japan.
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30
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Morishita T, Kobayashi S, Sato K, Sakae K, Ishikawa N, Kobayashi N, Noguchi Y, Akiyoshi K, Suga T, Ogawa A, Noro S, Sawada H, Kimura H, Yamada A, Ishizaki T, Kamimura N, Iwashima A, Ono T, Tachibana N, Sekine H, Ohnuki N, Kazama K, Sadamasu K, Ohta K, Mise K. [Preliminary screening for antiviral AIDS drugs. VIII. Report for fiscal year 1995]. Kokuritsu Iyakuhin Shokuhin Eisei Kenkyusho Hokoku 1998:152-4. [PMID: 9641832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Preliminary screening of antiviral AIDS drugs has been carried out using three different in vitro assay systems. Among 96 samples of different origin tested, two were shown to inhibit the growth of HIV in vitro. One of the positive samples (plant origin) has hopeful signs, as the ranges of effective doses are wider than those of most of positive samples which had been found by us.
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31
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Matsunaga Y, Amamoto N, Kondoh T, Ohtsuka Y, Miyazoe H, Kamimura N, Matsumoto T, Tsuji Y. A severe case of Moebius syndrome with calcification on the fourth ventricular floor. J Hum Genet 1998; 43:62-4. [PMID: 9610001 DOI: 10.1007/s100380050039] [Citation(s) in RCA: 8] [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: 02/07/2023]
Abstract
We report the case of a Japanese girl with a severe type of Moebius syndrome. Her morphological features were a mask-like face, limitation of horizontal eye movements, severe bulbar palsy, multiple and bilateral arthrogryposis including the elbow, knee, and ankle joints, and clubfeet. After birth, her general condition became worse because of repeated apneic spells and aspiration pneumonias due to dysphagia. She finally required tracheotomy. Computed tomography (CT) of the brain revealed minute calcifications on the fourth ventricle floor; this may have been due to severe damage to the brain stem. It is most likely that the various manifestations in our patient were due to disturbance of the blood supply to arteries perfusing the brain stem and to some other arteries, at a critical stage of fetal development.
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Affiliation(s)
- Y Matsunaga
- Department of Pediatrics, Nagasaki University School of Medicine, Japan
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32
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Mio Y, Suga S, Osanai T, Kanazawa T, Onodera K, Wada J, Kamimura N, Wakui M. Oxidized LDLs but not native LDLs augment Ba2+ currents through L-type Ca2+ channels of the A7r5 smooth muscle-derived cell line. Cell Signal 1997; 9:367-72. [PMID: 9376216 DOI: 10.1016/s0898-6568(96)00185-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 02/05/2023]
Abstract
The whole-cell patch-clamp method was used on A7r5 smooth muscle-derived cell line, and Ba2+ currents through Ca2+ channels were recorded. The A7r5 cells showed voltage-dependent, long-lasting Ba2+ currents which were markedly inhibited by nifedipine (10 microM). The magnitude of the maximum Ba2+ current (IBa(max)) was augmented by an application of dbcAMP (1 mM), but not affected by TPA (80 nM). Noradrenaline (NA) at 100 microM caused an increase in the IBa(max) by 19.7% in the presence of phentolamine (10 microM). This effect was cancelled by Rp-cAMPs (10 microM). In the presence of propranolol (10 microM), NA tended to reduce the IBa(max). Application of Ox-LDLs at 100 microg protein/ml caused an increase in the IBa(max) by 15.7%, whereas native LDLs did not change the IBa(max). Rp-cAMPs was ineffective to the Ox-LDL action on the IBa(max). In the presence of Ox-LDLs, NA augmented the IBa(max) by 21.4% in the presence of phentolamine. These results suggest that Ox-LDLs activate L-type Ca2+ channels of A7r5 cells by a mechanism independent of cAMP/PKA signalling.
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Affiliation(s)
- Y Mio
- Department of Physiology, Hirosaki University School of Medicine, Japan
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33
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Kamimura N, Matsuzaka T, Tsuji Y. [Neurological outcome associated with influenza viral infection]. Nihon Rinsho 1997; 55:880-5. [PMID: 9103888] [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: 02/04/2023]
Abstract
Several neurological complications associated with Influenza virus infection are known as a febrile convulsion, polyneuritis, meningitis, encephalomyelitis and encephalopathy. Influenza encephalopathy is the most severe complication associated with Influenza. It may be classified into several subtypes according to the clinical symptoms and laboratory data. In this review, Reye's syndrome, acute necrotizing encephalopathy and hemorrhagic shock and encephalopathy syndrome (HSE) are described in detail. The 1995 influenza pandemia in Nagasaki prefecture was markedly neurovirulent and lethal. Twelve cases developed influenza encephalopathy, and the mortality rate between them was 50%. Almost all of them had never be inoculated of influenza vaccine before.
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Affiliation(s)
- N Kamimura
- Department of Pediatrics, Nagasaki University School of Medicine
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34
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Kamimura N, Suga S, Wada J, Mio Y, Suzuki T, Wakui M. Excitatory and inhibitory actions of norepinephrine on the Ba2+ current through L-type Ca2+ channels of smooth muscle cells of guinea-pig vas deferens. J Cell Physiol 1996; 169:373-9. [PMID: 8908205 DOI: 10.1002/(sici)1097-4652(199611)169:2<373::aid-jcp17>3.0.co;2-a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [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: 02/03/2023]
Abstract
The effect of norepinephrine (NE) was examined on the whole-cell Ba2+ current through L-type Ca2+ channels of freshly isolated smooth muscle cells of guinea-pig vas deferens. The magnitude of maximum Ba2+ current [1Ba(max)] varied in different cells, although the capacitance of the cell membrane was similar (approximately 50 pF). Application of dbcAMP augmented 1Ba(max) by 37%, which was canceled by Rp-cAMPs, while PMA decreased the current by 32%, which was canceled by staurosporine. NE increased 1Ba(max) of the cells which originally showed relatively small 1Ba(max), and decreased the current of the cells which showed larger 1Ba(max). In the presence of phentolamine, NE increased 1Ba(max), and this effect was remarkable in cells showed smaller 1Ba(max). In the presence of propranolol, NE decreased 1Ba(max). The excitatory beta-adrenoceptor activation was canceled by Rp-cAMPs, and the inhibitory alpha-adrenoceptor effect was canceled by staurosporine. It is suggested that NE shows dual (excitatory and inhibitory) actions on the L-type Ca2+ channels of smooth muscle of guinea-pig vas deferens. The excitatory beta-adrenoceptor action mediated through cAMP/PKA is predominant in cells with lower density of the Ca2+ channels, while inhibitory alpha-adrenoceptor action mediated through PKC is predominant in cells with higher channel density.
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Affiliation(s)
- N Kamimura
- Department of Physiology, Hirosaki University School of Medicine, Japan
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35
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Wu J, Takeo T, Kamimura N, Wada J, Suga S, Hoshina Y, Wakui M. Thimerosal modulates the agonist-specific cytosolic Ca2+ oscillatory patterns in single pancreatic acinar cells of mouse. FEBS Lett 1996; 390:149-52. [PMID: 8706847 DOI: 10.1016/0014-5793(96)00646-1] [Citation(s) in RCA: 15] [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: 02/01/2023]
Abstract
Modulation of the agonist-specific cytosolic Ca2+ oscillatory pattern by thimerosal has been investigated in single pancreatic acinar cells using patch-clamp perforated whole-cell recording to measure the calcium-dependent chloride current (I(C1)(Ca2+)). 1 microM thimerosal, which fails to evoke Ca2+ oscillation alone, clearly changed the pattern of Ca2+ oscillation from pulsatile spikes (evoked by low concentrations of activators) to sinusoidal or transient oscillations. The mimetic action of thimerosal was independent of extracellular Ca2+, was blocked by extracellular application of dithiothreitol or 10 mM caffeine, as well as by internal perfusion with heparin; but was unaffected by ruthenium red. We conclude that thimerosal modulates the agonist-specific cytosolic Ca2+ oscillatory patterns mediated by sensitizing the InsP3-induced Ca2+ release.
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Affiliation(s)
- J Wu
- Department of Physiology 1, Hirosaki University School of Medicine, Japan.
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36
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Zhang W, Fukushi Y, Nishiyama A, Wada J, Kamimura N, Mio Y, Wakui M. Role of extracellular Ca2+ in acetylcholine-induced repetitive Ca2+ release in submandibular gland acinar cells of the rat. J Cell Physiol 1996; 167:277-84. [PMID: 8613468 DOI: 10.1002/(sici)1097-4652(199605)167:2<277::aid-jcp11>3.0.co;2-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Acetylcholine (ACh) caused repetitive transient Cl- currents activated by intracellular Ca2+ in single rat submandibular grand acinar cells. As the concentration of ACh increased the amplitude and the frequency of the transient Cl- currents increased. These responses occurred also in the absence of extracellular Ca2+ but disappeared after several minutes. Repetitive transient Cl- currents were restored by readmission of Ca2+ to the extracellular solution. The higher the concentration of extracellular Ca2+ readmitted, the larger the amplitude of the transient Cl- currents. Ca2+ entry through a store-coupled pathway was detected by application of Ca2+ to the extracellular solution during a brief cessation of stimulation with ACh. In these experiments too, the higher the concentration of Ca2+, the larger the transient Cl- currents activated by Ca2+ released from the stores. The time course of decrease in total charge movements of repetitive transient responses to ACh with removal of extracellular Ca2+ depended on a decrease in charge movements of each transient event rather than a decrease in frequency of the repetitive events. The decrease of charge movements of each transient event was due to a decrease in its amplitude rather than its duration. The results suggest that in this cell type and amplitude-modulated mechanism is involved in repetitive Ca2+ release and that Ca2+ entry is essential to maintain the repetitive release of Ca2+. The results further suggest that the magnitude of Ca2+ entry determines the number of unitary stores filled with Ca2+ which can synchronously respond to ACh.
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Affiliation(s)
- W Zhang
- Department of Physiology, Hirosaki University School of Medicine, Japan
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37
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Masuda Y, Kokubu T, Kamimura N, Yamashita M, Inoue S. 114 Egg lecithin is better than soybean lecithin to improve memory impairment of rats. Neurobiol Aging 1996. [DOI: 10.1016/s0197-4580(96)80116-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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38
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Ushijima H, Takahashi K, Kunisada T, Moritugu Y, Kobayashi N, Noguchi Y, Matsuyama M, Akiyoshi K, Noro S, Sawada H, Sakurada N, Yamada A, Ishizaki T, Kamimura N, Yoshida Y, Ono T, Ohtomo N, Morishita T, Kobayashi S, Miyake T, Ishiwara Y, Suzuki R, Saito T, Etoh S, Mise K. [Preliminary screening for antiviral AIDS drugs. VI. Report for fiscal year 1993]. Eisei Shikenjo Hokoku 1996:48-49. [PMID: 9037865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Preliminary screening of antiviral AIDS drugs has been carried out using three different in vitro assay systems. Among 138 samples tested, two were found to inhibit the growth of HIV in vitro. Neither of the positive samples has hopeful signs, as the ranges of effective doses of the samples are very narrow.
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39
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Takahashi M, Kamimura N, Kitamura Y, Sato H, Inoue S, Sanada J. 140 Quality of life in elderlies with dementia (1). Neurobiol Aging 1996. [DOI: 10.1016/s0197-4580(96)80142-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Ohmuki N, Kazama K, Sadamasu T, Sekine H, Ohta K, Kudoh Y, Kobayashi N, Noguchi Y, Matsuyama M, Akiyoshi K, Noro S, Sawada H, Kimura H, Yamada A, Ishizaki T, Kamimura N, Yoshida Y, Ono T, Tachibana N, Morishita T, Kobayashi S, Miyake T, Ishiwara Y, Ishikawa N, Moritugu Y. [Preliminary screening for antiviral AIDS drugs. VII. Report for fiscal year 1994]. Eisei Shikenjo Hokoku 1996:50-2. [PMID: 9037866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Preliminary screening of antiviral AIDS drugs has been carried out using three different in vitro assay systems. Among 246 samples of different origin tested, six were shown to inhibit the growth of HIV in vitro. Two of the positive samples have hopeful signs, as the ranges of effective doses are wider than those of most of positive samples which had been found by us.
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41
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Sanada I, Kamimura N, Kitamura Y, Sato H, Inoue S, Takahashi M. 141 Quality of life in elderlies with dementia (2). Neurobiol Aging 1996. [DOI: 10.1016/s0197-4580(96)80143-6] [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] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Wada J, Dobashi Y, Saito Y, Takeo T, Nakano K, Kamimura N, Wakui M. Repetition of oxytocin stimuli increases the sensitivity of oxytocin receptors in the dissected myometrium. J Smooth Muscle Res 1995; 31:522-4. [PMID: 8867993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Affiliation(s)
- J Wada
- Department of Obstetrics and Gynecology, Hirosaki University School of Medicine
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43
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Onizuka T, Kamimura N, Kajiwara H, Nakashima A, Suenaga K, Jimi T. Influence of boiling water treatment on surface roughness and surface microstructure of set gypsum (dental stone). Dent Mater J 1995; 14:245-55. [PMID: 8940563 DOI: 10.4012/dmj.14.245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 02/03/2023]
Abstract
The influence of boiling water treatment on the surface roughness and surface microstructure of set gypsums was investigated. Typical surfaces before and after immersion in boiling water were compared by means of SEM observation, the Knoop hardness test, and a surface roughness test. The surfaces of set gypsums were rougher than that of an acrylic resin plate, and after immersion in boiling water, highly roughened surfaces and thinner crystal bodies were observed on each specimen under SEM. The knoop hardness of set gypsums was considerably lowered after boiling water immersion. That of die stones was the same or lower than set dental stones. The results showed that even brief immersion in boiling water had profound effects on the dental stone cast, resulting in rougher surfaces and lower hardness of set gypsums.
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Affiliation(s)
- T Onizuka
- First Department of Prosthetic Dentistry, Kagoshima University Dental School, Japan
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44
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Wakui M, Wada J, Kamimura N, Mio Y, Sasaki T, Fukushi Y, Nishiyama A. Ca2+ entry through the store-mediated pathway directly activates only the K+ current but the subsequent Ca2+ release from the store activates both K+ and Cl- currents in submandibular gland acinar cells of the rat. Cell Signal 1995; 7:783-91. [PMID: 8593247 DOI: 10.1016/0898-6568(95)02006-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The store-mediated Ca2+ entry was detected in single and cluster of rat submandibular acinar cells by measuring the Ca2+ activated ionic membrane currents. In the cells where intracellular Ca2+ was partly depleted by stimulation with submaximal concentration of acetylcholine (ACh) under a Ca2(+)-free extracellular condition, an employment of external Ca2+ in the absence of ACh caused a sustained increase of the K+ current without affecting the Cl- current. A renewed ACh challenge without external Ca2+ caused repetitive spikes of both K+ and Cl- currents due to the Ca2+ release. SK & F 96365 inhibited the generation of the sustained K+ current and refilling of the Ca2+ store following the Ca2+ readmission. It is suggested that the Ca2+ enters the cell through the store-mediated pathway new the K+ channels and is taken up by the store. Thus, only Ca2+ released from the store can activate both the K+ and Cl- currents.
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Affiliation(s)
- M Wakui
- Department of Physiology, Hirosaki University School of Medicine, Japan
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45
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Fukushi Y, Suga S, Kamimura N, Wada J, Mio Y, Nishiyama A, Wakui M. Stimulated Ca2+ entry activates Cl- currents after releasing Ca2+ from the intracellular store in submandibular gland cells of the rat. Jpn J Physiol 1995; 45:1071-85. [PMID: 8676575 DOI: 10.2170/jjphysiol.45.1071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In order to examine whether Ca2+ entry is directly involved in controlling exocrine secretion, the Ca(2+)-activated Cl- currents were recorded in single and clusters of rat submandibular gland cells using the whole-cell patch-clamp method. Extracellularly applied acetylcholine (ACh, 10 nM) as well as intracellularly applied GTP gamma S and InsP3 caused repetitive transients of the Cl- currents activated by intracellular Ca2+. These responses occurred also in the absence of external Ca2+, but disappeared after several minutes. Readmission of Ca2+ to the extracellular solution restored the repetitive current transients, while introduction of Sr2+ failed to restore the current signals in spite of the presence of Sr2+ entry detected by microfluorimetry. On the other hand, direct application of Sr2+ to the cell inside caused activation of the Cl- currents although less effectively than Ca2+. When Ca2+ was introduced to the extracellular solution during an interruption of ACh stimulation after the ACh-induced depletion of intracellular Ca2+ store, the Cl- current was not elicited. However, a subsequent challenge with ACh at the same concentration in the absence of extracellular Ca2+ caused repetitive transient Cl- currents. The results suggest that in this cell type the stimulated Ca2+ entry does not by itself activate the Cl- currents but activates them indirectly by triggering Ca2+ release from the intracellular Ca2+ store which may take up Ca2+ soon after the Ca2+ entry.
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Affiliation(s)
- Y Fukushi
- Department of Physiology, Hirosaki University School of Medicine, Japan
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46
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Kamimura N, Hidaka M, Masaki H, Uozumi T. Construction of squalene-accumulating Saccharomyces cerevisiae mutants by gene disruption through homologous recombination. Appl Microbiol Biotechnol 1994. [DOI: 10.1007/s002530050262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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47
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Kamimura N, Hidaka M, Masaki H, Uozumi T. Construction of squalene-accumulating Saccharomyces cerevisiae mutants by gene disruption through homologous recombination. Appl Microbiol Biotechnol 1994; 42:353-7. [PMID: 7765777 DOI: 10.1007/bf00902741] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Saccharomyces cerevisiae synthesizes ergosterol via squalene, but squalene is hardly detected in aerobically grown cells. To obtain a stable squalene-accumulating yeast strain, we attempted to disrupt a gene required in the conversion of squalene to ergosterol, by homologous recombination with a short piece of the gene fragment conjugated with an integration plasmid vector carrying the LEU2 gene. Two mutants that required ergosterol at least for fast growth were isolated. In an aerobic cultivation and with ergosterol supplementation, the two mutants accumulated squalene up to 5 mg/g dry cells. Southern hybridization analysis indicated that both mutants had acquired the vector DNA integrated in the same gene, or nearby genes, on chromosome 12.
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Affiliation(s)
- N Kamimura
- Petroleum Research Laboratory, Mitsubishi Oil Co. Ltd., Kanagawa, Japan
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48
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Kamimura N, Nakamura T. [Hypoplastic leukemia which achieved remission with administration of M-CSF along with low dose ara-C]. Rinsho Ketsueki 1993; 34:662-666. [PMID: 8315838] [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: 05/22/2023]
Abstract
A 75-year-old female was admitted to our hospital because of fever and hypotension. The peripheral blood showed 400 leukocytes/microliters with 13,000/microliters platelets. Bone marrow puncture revealed that NCC stood at 14,000 with 50.0% blasts. The surface characters of the blasts were CD13+, CD33+, and HLA-DR+, and blood culture tests were positive. Coagulation tests revealed DIC. Based on the foregoing results, hypoplastic leukemia was diagnosed accompanied by sepsis and DIC, and was placed on the concomitant administration of a combination of low dose Ara-C and M-CSF. After 14 days of Ara-C administration and 26 days of M-CSF, her clinical symptoms improved, with the peripheral blood showing a WBC of 2,800/microliters and platelet count of 111,000/microliters. The percentage of myeloblasts decreased to 7.0%. After the administration of Ara-C was suspended for 2 weeks, another course of low dose Ara-C plus M-CSF administration was carried out and the patient achieved full remission. M-CSF stimulates not only the production of monocytes but increases the number of neutrophils and platelets through monocytes. It is also expected that tumoricidal activity may be realized by the activation of monocytes. In this patients, the concomitant administration of M-CSF and low dose Ara-C was remarkably effective in treating hypoplastic leukemia with severe complication. This result suggests that M-CSF will be useful for the treatment of leukemia.
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Affiliation(s)
- N Kamimura
- Department of Internal Medicine, Ojiya General Hospital
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49
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Shay JW, Baba T, Zhan QM, Kamimura N, Cuthbert JA. HeLaTG cells have mitochondrial DNA inserted into the c-myc oncogene. Oncogene 1991; 6:1869-74. [PMID: 1923509] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
To determine whether mitochondrial DNA (mtDNA) fragments found within the nucleus are transcribed, we have differentially screened a HeLaTG cDNA library. A clone that hybridized to mtDNA as well as to c-myc was identified. Analysis of the cDNA disclosed that it contained a mtDNA sequence, encoding cytochrome-c oxidase subunit III (coxIII) that was contiguous with and 5' of a c-myc sequence corresponding to part of exon 2 and exon 3. Hybridization of ScaI-digested DNA with a 1.05 kb c-myc probe revealed a unique band in HeLaTG cells, as well as a band common to HeLaTG and 13 other cell types examined. Solution hybridization of HeLaTG RNA with a radiolabeled, single-stranded cDNA probe containing the coxIII-c-myc junction demonstrated a nuclease-resistant band that matched the full length of the junctional cDNA probe. A smaller band that equaled the size of the c-myc portion alone was also detected. Only the smaller band coinciding with the c-myc sequences was protected from nuclease digestion by RNA from other cells. When a radiolabeled probe synthesized in the opposite orientation was used, nuclease-resistant bands equal in length to the coxIII portion of the probe were detected after hybridization with RNA from all cells. These results indicate that insertion of mtDNA fragments into nuclear genes occurs and that subsequent transcription of a 'chimaeric' or 'fusion' mRNA containing both mitochondrial and nuclear sequences can ensue.
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Affiliation(s)
- J W Shay
- Department of Cell Biology and Neuroscience, University of Texas Southwestern Medical Center, Dallas 75235-9039
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50
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Noro S, Sato N, Sakurada N, Fujita N, Ishizaki T, Kamimura N, Yoshida Y, Ono T, Ohtomo N, Matsuda Y. [Preliminary screening for antiviral AIDS drugs. II. Report on fiscal year 1989]. Eisei Shikenjo Hokoku 1991:107-10. [PMID: 1364373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Preliminary screening for antiviral AIDS drugs was carried out using three different in vitro assay systems. Among 104 samples tested, six were found to inhibit the growth of HIV in vitro. Four of six were acidic polysaccharides of sea weed origin and one was a well-known anti HIV chemical whose anti-HIV activity has not been reported.
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