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Yamazaki H, Kobayashi T, Hiranai S, Sawahata M, Toida N, Sato F, Hinata J, Terakado M, Ishita K, Ikeda R, Shinya T, Yajima S, Kajiwara K. Evaluation of a newly developed low reflection dummy load for high power millimeter waves. Fusion Engineering and Design 2023. [DOI: 10.1016/j.fusengdes.2023.113684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Ikeda R, Ichihara Y, Yamada Y, Saito S, Nishinaka T, Shinkawa T, Niinami H. Optimization of Left Ventricle Size After VAD Implantation Prevents Incidence of Cerebral Infarction. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.1163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kobayashi T, Yamazaki H, Hiranai S, Sawahata M, Terakado M, Ishita K, Hinata J, Sato F, Wada K, Ikeda R, Shinya T, Yajima S, Kajiwara K, Takahashi K, Moriyama S. High power experiment and heat load evaluation of transmission line for the ECH/CD system in JT-60SA. Fusion Engineering and Design 2022. [DOI: 10.1016/j.fusengdes.2022.113009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Yajima S, Kobayashi T, Kajiwara K, Ikeda R, Takahashi K. Development of a new analytic method for miter bend polarizer on ECW transmission line. Fusion Engineering and Design 2021. [DOI: 10.1016/j.fusengdes.2021.112487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Yajima S, Kajiwara K, Isozaki M, Kobayashi N, Ikeda R, Kobayashi T, Shinya T, Yamazaki H, Takahashi K. Estimation of RF power absorption and stray distribution at plasma breakdown based on the design of ITER ECH&CD equatorial launcher. Fusion Engineering and Design 2021. [DOI: 10.1016/j.fusengdes.2021.112470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ikeda R, Ichihara Y, Yamada Y, Saito S, Nishinaka T, Niinami H. Reversal and Resumption of Anti-Thrombotic Therapy in VAD-Related Hemorrhage. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.1102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Yokota T, Yoshikawa N, Arimori K, Ikeda R. Retrospective analysis of risk factors for liposomal amphotericin B-associated nephrotoxicity. Pharmazie 2020; 75:599-601. [PMID: 33239137 DOI: 10.1691/ph.2020.0731] [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: 06/11/2023]
Abstract
In this study, we examined patients who received liposomal amphotericin B (L-AMB) to determine the risk factors associated with nephrotoxicity before and during L-AMB treatment. In this retrospective, single-center, observational cohort study, we examined 37 patients who received L-AMB treatment between April 2018 and December 2019. Nephrotoxicity was observed in 11 (29.7%) patients. We focused on the baseline albumin level and body surface area (BSA) before L-AMB treatment. Univariate analysis showed that the BSA and baseline albumin levels in patients with nephrotoxicity were significantly higher than those in patients without nephrotoxicity. Moreover, univariate analysis showed that albumin supplementation was significantly associated with the frequency of nephrotoxicity during L-AMB treatment. Multiple logistic regression analysis revealed the following independent risk factors for nephrotoxicity before or during L-AMB treatment: baseline albumin level (odds ratio [OR] = 16.000; 95% CI 1.480-172.000; P = 0.022) and albumin supplementation (OR = 40.800; 95% CI 2.210-753.000; P = 0.013). In conclusion, we identified baseline albumin level and albumin supplementation as novel risk factors for L-AMB-induced nephrotoxicity.
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Affiliation(s)
- T Yokota
- Department of Pharmacy, University of Miyazaki Hospital, Miyazaki, Japan
| | - N Yoshikawa
- Department of Pharmacy, University of Miyazaki Hospital, Miyazaki, Japan;,
| | - K Arimori
- Department of Pharmacy, University of Miyazaki Hospital, Miyazaki, Japan
| | - R Ikeda
- Department of Pharmacy, University of Miyazaki Hospital, Miyazaki, Japan
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Yamamoto T, Ikeda R, Yamada D, Saitoh A, Koshiji K. Development of a high-hydrous gel phantom for human body communication based on electrical anisotropy. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:4028-4031. [PMID: 31946755 DOI: 10.1109/embc.2019.8857862] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this study, we investigated a highly hydrated gel phantom with electrical anisotropy that can be used at 18.375 MHz to 23.625 MHz. This is one of the frequency bands used for human body communication. To achieve the communication, the electrical characteristics of the quadriceps femoris muscle of the rat were measured immediately after sacrifice. These were used to obtain an indicator of electrical characteristics to be satisfied by the phantom. Electrical anisotropy was realized by adding carbon fiber to the phantom and controlling its direction. We were able to develop a high hydrated gel phantom for human body communication with a maximum error of 8.1% assuming its use at 18.735 MHz to 23.625 MHz.
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Bin W, Bruschi A, Fanale F, Francesca M, Lucca F, Albajar F, Alberti S, Carannante G, Cavinato M, Chelis I, Dell'Era F, Fasel D, Gantenbein G, Goodman T, Granucci G, Hogge JP, Ikeda R, Ioannidis Z, Legrand F, Mellera V, Minelli D, Nardone A, Pagonakis I, Rispoli N, Rzesnicki T, Sanchez F, Spinicchia N, Takahashi K, Tigelis I, Viganò F. Tests and developments of a long-pulse high-power 170 GHz absorbing matched load. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2018.11.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Affiliation(s)
- Y Suyama
- Division of Rheumatology, JR Tokyo General Hospital, 2-1-3 Yoyogi Shibuya-Ku, Tokyo 151-8528, Japan and Immuno-Rheumatology Center, St. Luke's International Hospital, St. Luke's International University, 9-1 Akashi-cho Chuo-Ku, Tokyo 104-8560, Japan
| | - R Ikeda
- Department of Neurosurgery, JR Tokyo General Hospital, 2-1-3 Yoyogi Shibuya-Ku, Tokyo, 151-8528, Japan
| | - S Tanaka
- Department of Pathology, JR Tokyo General Hospital, 2-1-3 Yoyogi Shibuya-Ku, Tokyo, 151-8528, Japan
| | - K Hagiwara
- Division of Rheumatology, JR Tokyo General Hospital, 2-1-3 Yoyogi Shibuya-Ku, Tokyo, 151-8528, Japan
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Oda Y, Ikeda R, Takahashi K, Kajiwara K, Kobayashi T, Sakamoto K, Moriyama S, Darbos C, Henderson M. Recent activities of ITER gyrotron development in QST. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201714901002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yoshimura Y, Kubo S, Shimozuma T, Igami H, Takahashi H, Kobayashi S, Ito S, Mizuno Y, Takita Y, Nakamura Y, Ohkubo K, Ikeda R, Ida K, Yoshinuma M, Sakakibara S, Mutoh T, Nagasaki K, Idei H, Notake T. Progress Toward Steady-State Operation in LHD Using Electron Cyclotron Waves. Fusion Science and Technology 2017. [DOI: 10.13182/fst58-551] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kobayashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Ito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Mizuno
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takita
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Ikeda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagasaki
- Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - T. Notake
- Tera-Photonics Laboratory, RIKEN, Sendai 980-0845, Japan
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Matsumoto K, Xavier S, Chen J, Kida Y, Lipphardt M, Ikeda R, Gevertz A, Caviris M, Hatzopoulos AK, Kalajzic I, Dutton J, Ratliff BB, Zhao H, Darzynkiewicz Z, Rose‐John S, Goligorsky MS. Instructive Role of the Microenvironment in Preventing Renal Fibrosis. Stem Cells Transl Med 2016; 6:992-1005. [PMID: 28297566 PMCID: PMC5442777 DOI: 10.5966/sctm.2016-0095] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 03/01/2016] [Accepted: 08/24/2016] [Indexed: 12/26/2022] Open
Abstract
Accumulation of myofibroblasts is a hallmark of renal fibrosis. A significant proportion of myofibroblasts has been reported to originate via endothelial‐mesenchymal transition. We initially hypothesized that exposing myofibroblasts to the extract of endothelial progenitor cells (EPCs) could reverse this transition. Indeed, in vitro treatment of transforming growth factor‐β1 (TGF‐β1)‐activated fibroblasts with EPC extract prevented expression of α‐smooth muscle actin (α‐SMA); however, it did not enhance expression of endothelial markers. In two distinct models of renal fibrosis—unilateral ureteral obstruction and chronic phase of folic acid‐induced nephropathy—subcapsular injection of EPC extract to the kidney prevented and reversed accumulation of α‐SMA‐positive myofibroblasts and reduced fibrosis. Screening the composition of EPC extract for cytokines revealed that it is enriched in leukemia inhibitory factor (LIF) and vascular endothelial growth factor. Only LIF was capable of reducing fibroblast‐to‐myofibroblast transition of TGF‐β1‐activated fibroblasts. In vivo subcapsular administration of LIF reduced the number of myofibroblasts and improved the density of peritubular capillaries; however, it did not reduce the degree of fibrosis. A receptor‐independent ligand for the gp130/STAT3 pathway, hyper‐interleukin‐6 (hyper‐IL‐6), not only induced a robust downstream increase in pluripotency factors Nanog and c‐Myc but also exhibited a powerful antifibrotic effect. In conclusion, EPC extract prevented and reversed fibroblast‐to‐myofibroblast transition and renal fibrosis. The component of EPC extract, LIF, was capable of preventing development of the contractile phenotype of activated fibroblasts but did not eliminate TGF‐β1‐induced collagen synthesis in cultured fibroblasts and models of renal fibrosis, whereas a receptor‐independent gp130/STAT3 agonist, hyper‐IL‐6, prevented fibrosis. In summary, these studies, through the evolution from EPC extract to LIF and then to hyper‐IL‐6, demonstrate the instructive role of microenvironmental cues and may provide in the future a facile strategy to prevent and reverse renal fibrosis. Stem Cells Translational Medicine2017;6:992–1005
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Affiliation(s)
- Kei Matsumoto
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
- Showa University, Tokyo, Japan
| | - Sandhya Xavier
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Jun Chen
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Yujiro Kida
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Mark Lipphardt
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Reina Ikeda
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
- Okayama University, Okayama, Japan
| | - Annie Gevertz
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Mario Caviris
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | | | - Ivo Kalajzic
- University of Connecticut Health Center, Farmington, Connecticut, USA
| | - James Dutton
- Stem Cell Institute, University of Minnesota, Minneapolis, Minnesota, USA
| | - Brian B. Ratliff
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Hong Zhao
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Zbygniew Darzynkiewicz
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
- Renal Research Institute, New York Medical College, Valhalla, New York, USA
| | - Stefan Rose‐John
- Institute of Biochemistry, Christian‐Albrechts University, Kiel, Germany
| | - Michael S. Goligorsky
- Department of Medicine, New York Medical College, Valhalla, New York, USA
- Department of Pharmacology, New York Medical College, Valhalla, New York, USA
- Department of Physiology, New York Medical College, Valhalla, New York, USA
- Department of Pathology, New York Medical College, Valhalla, New York, USA
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Shimizu NS, Handa A, Shimizu NG, Ikeda R, Uchiyama T, Achiwa K, Hoshino H. Inhibition of Infection of T-Cells with Human Immunodeficiency Virus Type 1 by Dideoxynucleosides Conjugated with Oligopeptides. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/095632029500600103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We conjugated nucleoside derivatives that have anti-HIV-1 activities with oligopeptides that should bind to the gp120 of the HIV-1 virion, and examined their anti-HIV-1 activities. These derivates included 3′-azido-2′,3′-dideoxythymidine (AZT), 2′,3′-dideoxyuridine (ddU), 2′,3′-dideoxycytidine (ddC), 2′,3′-dideoxyinosine (ddI) and 2′,3′-dideoxyadenine (ddA). Dipeptides consisting of N-carbomethoxy-carbonyl-prolyl-phenylalanylbenzyl ester (CPF) and oligopeptides derived from the complementarity-determining region 2 (CDR2) of domain 1 of CD4 were synthesized. The N-terminals of these peptides were conjugated with the 5′OH of AZT, ddU, ddC, ddl or ddA through carbonyl moieties. CPF conjugated with AZT, ddC, ddl or ddA through two-carbonyl moieties exhibited powerful anti-HIV-1 activity, which was similar to that of the respective nucleosides when compared at the same molar concentration. No complex compound connected by a one-carbonyl moiety had anti-HIV-1 activity, whereas a tetrapeptide or octapeptide of the CDR2 region combined with AZT did have such activity. The toxicity of these CPF-containing compounds to human peripheral blood lymphocytes was slightly weaker than the toxicities of the corresponding nucleosides lacking CPF. Antiviral nucleosides containing oligopeptides may be used as lead compounds in an effort to isolate more effective and less cytotoxic anti-HIV-1 agents.
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Affiliation(s)
- N. S. Shimizu
- Department of Hygiene and Virology, Gunma University School of Medicine, Showa-machi, Maebashi, Gunma 371, Japan
| | - A. Handa
- Department of Hygiene and Virology, Gunma University School of Medicine, Showa-machi, Maebashi, Gunma 371, Japan
| | - N. G. Shimizu
- Department of Hygiene and Virology, Gunma University School of Medicine, Showa-machi, Maebashi, Gunma 371, Japan
| | - R. Ikeda
- Department of Hygiene and Virology, Gunma University School of Medicine, Showa-machi, Maebashi, Gunma 371, Japan
- Laboratory of Infectious Diseases, Nippon Kayaku Co., Ltd, Iwahana-machi, Takasaki, Gunma 370-12, Japan
| | - T. Uchiyama
- School of Pharmaceutical Sciences, University of Shizuoka, Yada 395, Shizuoka 422, Japan
| | - K. Achiwa
- School of Pharmaceutical Sciences, University of Shizuoka, Yada 395, Shizuoka 422, Japan
| | - H. Hoshino
- Department of Hygiene and Virology, Gunma University School of Medicine, Showa-machi, Maebashi, Gunma 371, Japan
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Takahashi K, Abe G, Kajiwara K, Oda Y, Isozaki M, Ikeda R, Sakamoto K, Omori T, Henderson M. Design modification of ITER equatorial EC launcher for electron cyclotron heating and current drive optimization. Fusion Engineering and Design 2015. [DOI: 10.1016/j.fusengdes.2015.04.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Matsui K, Mori A, Ikeda R. Langerhans cell-like dendritic cells stimulated with an adjuvant direct the development of Th1 and Th2 cells in vivo. Clin Exp Immunol 2015; 182:101-7. [PMID: 26084192 DOI: 10.1111/cei.12671] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2015] [Indexed: 12/14/2022] Open
Abstract
It is well known that Langerhans cells (LCs) work as the primary orchestrators in the polarization of immune responses towards a T helper type 1 (Th1) or Th2 milieu. In this study, we attempted to generate LCs from murine bone marrow cells and elicit a Th1- or Th2-prone immune response through the LCs after stimulation with Th1 or Th2 adjuvant. LCs were generated from murine bone marrow cells using granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin (IL)-4 and transforming growth factor (TGF)-β, and were obtained as I-A(d) positive cells. Mice were primed with Th1/Th2 adjuvant- and ovalbumin (OVA)-pulsed LCs and then given a booster injection of OVA 2 days later via the hind footpad. Five days after the OVA injection, the cytokine response in the draining popliteal lymph nodes was investigated by reverse transcription-polymerase chain reaction (RT-PCR) flow cytometry and enzyme-linked immunosorbent assay (ELISA). The generated LCs expressed typical LC surface markers, E-cadherin and Langerin, and were classified accordingly as LC-like dendritic cells (LDCs). Administration of Th1 adjuvant, cytosine-phosphate-guanosine (CpG)-DNA- and OVA-pulsed LDCs into the hind footpads of mice induced a Th1-prone immune response, as represented by up-regulation of IFN-γ production and down-regulation of IL-4 production in the lymph node cells. Conversely, Th2 adjuvant, histamine-pulsed LDCs induced a Th2-prone immune response, as represented by up-regulation of IL-4 production and down-regulation of IFN-γ production. These results suggest that LDCs may be used as a substitute for LCs and have the ability to induce the development of Th1 and Th2 cells in vivo. Our experimental system would therefore be useful for screening of inhibitors of Th1/Th2 differentiation in order to control allergic disease.
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Affiliation(s)
- K Matsui
- Department of Microbial Science and Host Defense, Meiji Pharmaceutical University, Tokyo, Japan
| | - A Mori
- Department of Microbial Science and Host Defense, Meiji Pharmaceutical University, Tokyo, Japan
| | - R Ikeda
- Department of Microbial Science and Host Defense, Meiji Pharmaceutical University, Tokyo, Japan
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Tamura A, Maruyama Y, Ishitobi Y, Kawano A, Ando T, Ikeda R, Inoue A, Imanaga J, Okamoto S, Kanehisa M, Ninomiya T, Tanaka Y, Tsuru J, Akiyoshi J. Salivary alpha-amylase and cortisol responsiveness following electrical stimulation stress in patients with the generalized type of social anxiety disorder. Pharmacopsychiatry 2013; 46:225-60. [PMID: 23975855 DOI: 10.1055/s-0033-1353157] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Social anxiety disorder is believed to be a stress-induced disease. Although it can be inferred from the symptoms during attacks that there exists some abnormality of autonomic nervous system in any of the stress systems in social anxiety disorder, little evidence has been reported. This study focused on comparing the reactivity of 2 stress systems, the autonomic nervous system (ANS) and the hypothalamic-pituitary-adrenal (HPA) axis in patients with social anxiety disorder. METHODS 32 patients with the generalized type of social anxiety disorder were compared with 80 age- and gender-matched controls. We collected saliva samples from patients and controls before and after electrical stimulation to measure the concentrations of salivary alpha-amylase (sAA) and salivary cortisol. Profile of Mood State (POMS) and State-Trait Anxiety Inventory (STAI) scores and Heart Rate Variability (HRV) were also determined following stimulation. RESULTS SAA in patients displayed a significantly higher level at baseline and a significantly larger response to electrical stimulation as compared to controls, whereas no group differences were seen in any HRV. Neither within-subject nor group differences were seen in salivary cortisol levels. CONCLUSIONS These results suggest that SAD patients displayed enhanced ANS (but not HPA axis) activity vs. healthy controls.
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Affiliation(s)
- A Tamura
- Department of Neuropsychiatry, Oita University Faculty of Medicine, Hasama-Machi, Oita, Japan
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Hamada A, Akiyoshi R, Ishii J, Hamada N, Miyazaki C, Hamada T, Ohwaki Y, Ikeda R, Wada M, Nakashima K. Influence of calcium channel blockers in patients with gastrointestinal disease in Japanese community pharmacies. J Clin Pharm Ther 2012; 37:74-7. [DOI: 10.1111/j.1365-2710.2011.01253.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ikeda R, Aiyama S, Redman RS. Exogenous thyroid hormone affects myoepithelium and proliferation in the developing rat parotid gland. Biotech Histochem 2010; 84:267-74. [PMID: 19468923 DOI: 10.3109/10520290902984258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In the mature rat parotid gland, myoepithelial cells (MEC) invest intercalated ducts, but not acini. During postnatal development, however, these cells differentiate around both intercalated ducts and acini, then translocate to only intercalated ducts during weaning. Previously, we found that thyroxine (T(4)) accelerates translocation of cells with small secretory granules from acini into intercalated ducts and the number of apoptotic cells increased tremendously with high doses. We present here additional analysis of the effects of T(4) on developing rat parotid gland, namely, the distribution of MEC and the proliferation of parenchymal cells. Beginning at age four days, pups were given daily subcutaneous injections of low, medium, and high doses of T(4) or vehicle or no injection. At ages 4, 7, 10, and 15 days, glands were excised and processed for light microscopy. Sections were double-immunostained with antibodies against proliferating cell nuclear antigen (PCNA) and actin, and counterstained with hematoxylin. Proliferative activity was assessed via PCNA histochemistry and MEC were identified using actin histochemistry. MEC in the T(4) groups invested mostly acini at 15 days in vehicle/normal glands and mostly intercalated ducts after 10 days in the T(4) groups. The proliferative activity of acinar cells and MEC in vehicle/normal glands declined progressively with age and T(4) increased the rate of this decline in the MEC in a dose-dependent manner. We conclude that T(4) accelerates the translocation of MEC from acini to intercalated ducts and that an important mechanism is the more rapid decline in the proliferative activity of MEC than in acinar cells in the T(4) groups. Some of the decline in the proliferative activity of all cells in the high and medium dose T(4) groups after seven days may have been due to dose-related thyroxine toxicity.
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Affiliation(s)
- R Ikeda
- Department of Dental Hygiene, The Nippon Dental University College at Tokyo, Tokyo, Japan.
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Takemoto H, Murata K, Tomita N, Fukunaga M, Watanabe M, Ohue M, Ikeda R, Tanimoto K, Hiyama K, Nishiyama M. Pharmacogenomic analysis for prediction of individual response to mFOLFOX6 in colorectal cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e13500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Chin K, Kato K, Yoshikawa T, Yamaguchi K, Esaki T, Tsuji Y, Sakai K, Kimura M, Ikeda R, Matsumura Y. Phase II study of NK105, a paclitaxel-incorporating micellar nanoparticle as second-line treatment for advanced or recurrent gastric cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.4041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Ikeda R, Yoshida K, Satou Y, Takahashi M, Une Y, Yamamoto W, Tanimoto K, Hiyama K, Sasaki Y, Nishiyama M. Randomized phase II/III study of docetaxel/S-1 (DS-1) versus CDDP/5FU (FUP) in advanced or recurrent gastric cancer: Updated phase II results. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.4595] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
4595 Background: Our previous single arm phase II trial demonstrated that the combination of DS-1 was one of the most powerful candidates to become a standard regimen for metastatic gastric cancer (K. Yoshida, et al: Clin Cancer Res 2006). This trial evaluated DS-1 and FUP in advanced or recurrent gastric cancer, and the primary objective of the phase II part was to evaluate activity and safety of the 2 regimens. Methods: Patients with advanced or recurrent gastric cancer, who had not received any chemotherapy except one regimen (not including taxanes), were eligible for this trial. Patients were randomized to either: DS-1, intravenous administration of 40 mg/m2 docetaxel on Day1 and oral administration of 80–120 mg/m2/day S-1 on Days 1 to 14 every 3 weeks, or FUP, intravenous continuous administration of 800 mg/m2/day 5-FU on Day 1 to 5 and intravenous administration of 80 mg/m2/day CDDP on Day 2 every 4 weeks. Results: Between June 2005 and August 2008, forty-nine of 54 patients (ECOG PS 0–2) were randomized to DS-1 (n=24) or FUP (n=25). Response rates (CR+PR) assessed by RECIST were 88.3% (CI;62.6–95.3) vs 52.0% (CI; 31.3–72.2, P=0.032), median times to treatment failure (TTF) were 122 days (CI; 75.2–168.8) vs 85 days (CI;67.9–102.1, P=0.003), median progression free survivals (PFS) were 198 days (CI;117.8–278.4) vs 105 days (CI;90.3–119.7, P=0.066). Median overall survival times (MSTs) were 369 days (CI; 359.6–378.4) vs 371 days (CI; 297.2- 444.8, P=0.281), but as of today, 14 pts (8 in DS-1 and 6 in FUP) are still alive. Grade 3/4 adverse events assessed by CTCAE v3.0 occurring in ≥20% patients, were neutropenia (58.3% vs 28.0%), nausea (4.2% vs 20.0%), leucopenia (33.0% vs 4.0%), fatigue (0% vs 20.0%) and anorexia (8.3% vs 32.0%). All treatment-related adverse events were resolved and no toxic death was reported. Conclusions: DS-1 significantly improved the RR and TTF in advanced or recurrent gastric cancer patients. To clarify the survival benefit, a phase III continuation of the study is in preparation. No significant financial relationships to disclose.
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Affiliation(s)
- R. Ikeda
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - K. Yoshida
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Y. Satou
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - M. Takahashi
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Y. Une
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - W. Yamamoto
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - K. Tanimoto
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - K. Hiyama
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - Y. Sasaki
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
| | - M. Nishiyama
- Development Organization for Frontier Med Therap., Hiroshima, Japan; Gifu University, Graduate School of Medicine, Gifu, Japan; Kawakita General Hospital, Tokyo, Japan; Asahikawa-Kosei General Hospital, Asahikawa, Japan; Nishi Sapporo Natl Hosp., Sapporo, Japan; Senju Central Clinic, Tokyo, Japan; Hiroshima University, R.I.R.B.M., Hiroshima, Japan; Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
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Ikeda R, Aiyama S, Redman RS. Exogenous thyroid hormone affects myoepithelium and proliferation in the developing rat parotid gland. Biotech Histochem 2009. [DOI: 10.1080/10520290902984258] [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] Open
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Mizoguchi K, Ikeda R, Shoji H, Tanaka Y, Maruyama W, Tabira T. Aging attenuates glucocorticoid negative feedback in rat brain. Neuroscience 2008; 159:259-70. [PMID: 19141312 DOI: 10.1016/j.neuroscience.2008.12.020] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Revised: 12/09/2008] [Accepted: 12/12/2008] [Indexed: 11/16/2022]
Abstract
Aging is thought to be a risk factor to develop vulnerability of the neuroendocrine system, including the hypothalamic-pituitary-adrenal (HPA) axis, and dysregulation of this axis characterized by dexamethasone (DEX)-mediated negative feedback resistance is sometimes observed in elderly humans and animals. However, the influence of aging on the feedback system including an involvement of the brain is not fully understood. In the present study, we examined the suppressive effects of DEX by the systemic injection or the intracranial infusion into the prefrontal cortex (PFC), hippocampus, and hypothalamus on circulating corticosterone levels, and compared between young (3-month-old) and aged (24-month-old) rats. Moreover, we examined expression levels of glucocorticoid receptors (GRs) and their translocation from the cytoplasm to the nucleus using immunohistochemical and Western immunoblot techniques in the pituitary in addition to three brain regions. When DEX was injected systemically, the suppressive response was significantly enhanced in aged rats, compared with young rats. When DEX was infused into three brain regions, the suppressive response to DEX was abolished in aged rats. The immunohistochemical analysis revealed that the number of GR positive cells in the PFC, hippocampus, and hypothalamus was decreased, but that in the pituitary was increased, in aged rats, compared with young rats. The Western immunoblot analysis confirmed these results. Thus, basal expression levels of GRs in three brain regions were decreased, but those in the pituitary were increased, in aged rats. After the injection or infusion of DEX, the translocation of GRs in three brain regions was reduced, but that in the pituitary was enhanced, in aged rats. These results suggest that aging in rats enhances the feedback ability at the systemic level, which mainly involves the pituitary, but it attenuates the ability in the brain. These mechanisms may underlie the vulnerable neuroendocrine systems associated with aging.
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Affiliation(s)
- K Mizoguchi
- Section of Oriental Medicine, Department of Geriatric Medicine, National Institute for Longevity Sciences, National Center for Geriatrics and Gerontology, 36-3 Gengo, Morioka, Obu, Aichi 474-8522, Japan.
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25
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Tanei H, Nakamura N, Ogi H, Hirao M, Ikeda R. Unusual elastic behavior of nanocrystalline diamond thin films. Phys Rev Lett 2008; 100:016804. [PMID: 18232804 DOI: 10.1103/physrevlett.100.016804] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Indexed: 05/25/2023]
Abstract
This Letter studies the relationship between the elastic constants and the microstructure of nanocrystalline diamond thin films deposited by the chemical vapor deposition method doping various concentration of N2 gas. The elastic constants were measured by resonant ultrasound spectroscopy and picosecond laser ultrasounds. The increase of N2 gas decreases the diagonal elastic constants, but increases the off-diagonal elastic constants. The micromechanics calculation can explain this unusual elastic behavior, and it predicts thin graphitic phases at grain boundaries.
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Affiliation(s)
- H Tanei
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Ikeda R, Yoshida K, Takagane A, Tsuburaya A, Kobayashi O, Sunouchi H, Matsukawa M, Tanimoto K, Hiyama K, Nishiyama M. Pharmacogenomic (PG) analysis for prediction of individual response to paclitaxel in 5-FU-refractory metastatic gastric cancer: Prediction formula of tumor response using novel marker genes and genotypes associated with the toxicity. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.2538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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
2538 Background: Taxanes offer hope for improving outcomes of metastatic gastric cancer patients including 5-FU failure cases, but the response remarkably varies among patients. We conducted this prospective PG study for paclitaxel monotherapy to develop a prediction formula of efficacy and to identify potent genetic markers of toxicity. Methods: Paclitaxel was intravenously given on Days 1, 8, and 15, every 4 weeks in 5-FU failure metastatic gastric cancer patients with typical eligibility criteria. Tumor and blood samples were collected before the initial paclitaxel administration for PG. PK analysis was done on day 1 of cycle 1. Tumor response and toxicity were evaluated by RECIST and CTCAE, respectively. Results: Forty-nine pts were enrolled, and up to date, 48 and 44 pts have been determined for worst toxicity and best tumor response, respectively. Observed response rate was 27.3% (12/44), and common grade 3/4 toxicities were neutropenia (31.3%) and leucopenia (20.8%). PG analysis demonstrated that CYP2C8*1C (w/v=27, v/v=5) and CYP2C8 -411T>C (w/v=24, v/v=10) were weakly associated with grade 3/4 leucopenia (p=0.087 and 0.092), and CYP2C8 IVS7+49T> A (w/v=9, v/v=6) might correlate with grade 3/4 anemia (p=0.039), although none of them correlated with any PK parameter. We identified 4 novel potent marker genes (SEPT5, MARN2, PER3, and PISA3) for paclitaxel efficacy in vitro through microarray expression analysis, and then successfully developed the best linear models, which converted the quantified expression data into objective clinical response, in terms of best tumor response (r=0.985, AICS=-5.269) and overall survival (r=0.980, AICS=6.953), using 15 and 13 data sets of gene expression and clinical response, respectively. At present, utility-confirmation analyses using other clinical samples appeared to show that the formulae could accurately predict tumor response. Conclusions: Polygenetic strategies using several known polymorphisms for toxicity and a prediction formula using 4 novel genes for efficacy would be of predictive value for individual response to paclitaxel. No significant financial relationships to disclose.
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Affiliation(s)
- R. Ikeda
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - K. Yoshida
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - A. Takagane
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - A. Tsuburaya
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - O. Kobayashi
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - H. Sunouchi
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - M. Matsukawa
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - K. Tanimoto
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - K. Hiyama
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
| | - M. Nishiyama
- Hiroshima Cancer Ther Dev Org, Hiroshima, Japan; Hiroshima Univ, Hiroshima, Japan; Iwate Med Univ, Morioka, Japan; Kanagawa Cancer Ctr Hosp, Yokohama, Japan; Kawakita General Hosp, Tokyo, Japan; Showa Univ Toyosu Hosp, Tokyo, Japan
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Takahashi H, Utoh H, Kitajima S, Isobe M, Suzuki C, Takeuchi M, Ikeda R, Tanaka Y, Yokoyama M, Toi K, Okamura S, Sasao M. Hot Cathode Biasing Experiments in Helical Systems. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Takahashi
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - H. Utoh
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - S. Kitajima
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - M. Isobe
- National Institute for Fusion Science, Toki, Japan
| | - C. Suzuki
- National Institute for Fusion Science, Toki, Japan
| | - M. Takeuchi
- Nagoya University, Department of Energy Engineering and Science, Nagoya, Japan
| | - R. Ikeda
- Nagoya University, Department of Energy Engineering and Science, Nagoya, Japan
| | - Y. Tanaka
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki, Japan
| | - S. Okamura
- National Institute for Fusion Science, Toki, Japan
| | - M. Sasao
- Tohoku University, Department of Quantum Science and Energy Engineering, Sendai, Japan
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Kobayashi T, Ohki H, Ikeda R. Molecular Motions in the Novel Plastic Phase of Decamethylferrocene Studied by1H NMR and Thermal Measurements. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259408033784] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- T. Kobayashi
- a Department of Chemistry , University of Tsukuba , Tsukuba , 305 , Japan
| | - H. Ohki
- a Department of Chemistry , University of Tsukuba , Tsukuba , 305 , Japan
| | - R. Ikeda
- a Department of Chemistry , University of Tsukuba , Tsukuba , 305 , Japan
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Kawamura K, Fujikawa-Yamamoto K, Ozaki M, Iwabuchi K, Nakashima H, Domiki C, Morita N, Inoue M, Tokunaga K, Shiba N, Ikeda R, Suzuki K. Centrosome hyperamplification and chromosomal damage after exposure to radiation. Oncology 2005; 67:460-70. [PMID: 15714003 DOI: 10.1159/000082931] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [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: 11/20/2003] [Accepted: 04/23/2004] [Indexed: 01/15/2023]
Abstract
OBJECTIVE In order to elucidate the effects of radiation on centrosome hyperamplification (CH), we examined the centrosome duplication cycle in KK47 bladder cancer cells following irradiation. METHODS KK47 cells were irradiated with various doses of radiation and were examined for CH immunostaining for gamma-tubulin. RESULTS Nearly all control cells contained one or two centrosomes, and mitotic cells displayed typical bipolar spindles. The centrosome replication cycle is well regulated in KK47. Twenty-four hours after 5-Gy irradiation, approximately 80% of irradiated cells were arrested in G2 phase, and at 48 h after irradiation, 56.9% of cells contained more than two centrosomes. Laser scanning cytometry performed 48 h after irradiation showed the following two pathways: (1) unequal distribution of chromosomes to daughter cells, or (2) failure to undergo cytokinesis, resulting in polyploidy. With mitotic collection, M-phase cells with CH could be divided into G1 cells with micronuclei and polyploidal cells. Fluorescence in situ hybridization analysis showed clear signs of chromosomal instability (CIN) at 48 h after irradiation. The present study had two major findings: (1) continual duplication of centrosomes occurred in the cell cycle-arrested cells upon irradiation, leading to centrosome amplification; (2) cytokinesis failure was due to aberrant mitotic spindle formation caused by the presence of amplified centrosomes. Abnormal mitosis with amplified centrosomes was detected in the accumulating G2/M population after irradiation, showing that this amplification of centrosomes was not caused by failure to undergo cytokinesis, but rather that abnormal mitosis resulting from amplification of centrosomes leads to cytokinesis block. CONCLUSION These results suggest that CH is a critical event leading to CIN following exposure to radiation.
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Affiliation(s)
- K Kawamura
- Department of Urology, Kanazawa Medical University, Daigaku Uchinada, Ishikawa, Japan.
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Ikeda R, Kato F. Early and transient increase in spontaneous synaptic inputs to the rat facial motoneurons after axotomy in isolated brainstem slices of rats. Neuroscience 2005; 134:889-99. [PMID: 15994018 DOI: 10.1016/j.neuroscience.2005.05.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2005] [Revised: 05/10/2005] [Accepted: 05/11/2005] [Indexed: 02/05/2023]
Abstract
Section of motor nerve fibers (axotomy) elicits a variety of morphofunctional responses in the motoneurons in the motor nuclei. Later than the fifth post-operational day after section of the facial nerve, synapse elimination occurs in the facial motoneuron pool, leading to gradual abolishment of synaptic input-driven activities of the axotomized motoneurons. However, it remains unknown how the amount of synaptic input changes during this period between the axotomy and the synaptic elimination. Here we examined a hypothesis that axotomy of the motoneurons itself modifies the synaptic inputs to the motoneurons. One day after axotomy, the postsynaptic currents, mostly mediated by non-N-methyl-D-aspartic acid (non-NMDA) receptors, recorded from the axotomized facial motoneurons in the acute slice preparations of the rats were of higher frequency and larger amplitude than those in the intact motoneurons. This difference was not observed after the third post-operational day and appeared earlier than the changes in the electrophysiological properties and increase in the number of dead neurons in the axotomized motor nucleus. The larger postsynaptic current frequency of the axotomized motoneurons was observed both in the absence and in the presence of tetrodotoxin citrate, suggesting that increased excitability and facilitated release underlie the postsynaptic current frequency increase. These results suggest that synaptic re-organization occurs in the synapses of motoneurons at an early stage following axotomy.
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Affiliation(s)
- R Ikeda
- Laboratory of Neurophysiology, Department of Neuroscience, Jikei University School of Medicine, 3-25-8 Nishi-shimbashi, Minato-ku, Tokyo 105-8461, Japan
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Higashi K, Ueda Y, Ikeda R, Kodama Y, Guo J, Matsunari I, Oguchi M, Tonami H, Katsuda S, Yamamoto I. P-glycoprotein expression is associated with FDG uptake and cell differentiation in patients with untreated lung cancer. Nucl Med Commun 2004; 25:19-27. [PMID: 15061261 DOI: 10.1097/00006231-200401000-00004] [Citation(s) in RCA: 18] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In vitro studies demonstrated that the accumulation of 2-deoxy-D-glucose was reduced in multidrug resistant cell lines. In animal study, it has been suggested that 2-[18F]fluoro-2-deoxy-D-glucose (FDG) may be a marker for multidrug resistance (MDR). The aim of this clinical study was to compare MDR characteristics by immunohistochemical assay with FDG uptake and investigate whether FDG is a marker for MDR in patients with untreated lung cancer. Forty-seven patients with 49 untreated lung cancers, who had undergone both preoperative FDG PET imaging and thoracotomy, were enrolled in this study. Before surgery, FDG PET was performed 40 min after injection, and standardized uptake values (SUVs) were obtained. Patients were classified into low-SUV (< or = 5) and high-SUV (> 5) groups. After surgery, the expression of P-glycoprotein (Pgp) was investigated by immunohistochemistry, and the lung cancer FDG uptake was analysed for possible association with Pgp expression. The strong intensity of Pgp immunoreactivity was seen only in the low-SUV group. The percentage of the Pgp positive area was significantly lower in the high-SUV group (21.7 +/- 13.4%) than in the low-SUV group (44.1 +/- 29.7%) (P = 0.015). In the high-SUV group, the percentage of Pgp positive area did not exceed 50%. In lung adenocarcinoma, the intensity of Pgp immunoreactivity and the percentage of Pgp positive area increased with degree of cell differentiation, while FDG uptake decreased with degree of cell differentiation. Bronchioloalveolar carcinoma, in particular, showed overexpression of Pgp and modest uptake of FDG. In conclusion, Pgp expression was found to be inversely related to FDG uptake in untreated lung cancer. Pgp expression correlated with the degree of cell differentiation in adenocarcinomas, whilst FDG uptake was inversely related to cell differentiation. FDG may be an in vivo marker for MDR in patients with untreated lung cancer.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- Adenocarcinoma, Bronchiolo-Alveolar/diagnostic imaging
- Adenocarcinoma, Bronchiolo-Alveolar/metabolism
- Adenocarcinoma, Bronchiolo-Alveolar/pathology
- Adenocarcinoma, Bronchiolo-Alveolar/surgery
- Aged
- Aged, 80 and over
- Biomarkers, Tumor/metabolism
- Cell Division
- Drug Resistance, Multiple
- Female
- Fluorodeoxyglucose F18/pharmacokinetics
- Gene Expression Regulation, Neoplastic
- Humans
- Lung Neoplasms/diagnostic imaging
- Lung Neoplasms/metabolism
- Lung Neoplasms/pathology
- Lung Neoplasms/surgery
- Male
- Middle Aged
- Radionuclide Imaging
- Radiopharmaceuticals/pharmacokinetics
- Reproducibility of Results
- Sensitivity and Specificity
- Statistics as Topic
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Affiliation(s)
- K Higashi
- Department of Radiology, Kanazawa Medical University, Uchinada, Ishikawa, Japan.
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Shibayama Y, Ikeda R, Motoya T, Yamada K. St. John's Wort (Hypericum perforatum) induces overexpression of multidrug resistance protein 2 (MRP2) in rats: a 30-day ingestion study. Food Chem Toxicol 2004; 42:995-1002. [PMID: 15110109 DOI: 10.1016/j.fct.2004.02.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [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: 10/14/2002] [Accepted: 02/16/2004] [Indexed: 11/27/2022]
Abstract
St. John's Wort (Hypericum perforatum, SJW) has been used as a herbal medicine for the treatment of depression in oral doses of 900-1050 mg/day in humans. However, the ingestion of SJW was reported to cause interactions with drugs. In the present study, we examined the effects of SJW treatment on the induction of drug transporters and enzymes in rats. An immunoblot analysis was performed to quantify the expression of the transporters and enzymes. SJW was given at a dose of 400 mg/kg/day, since it was reported that 400 mg/kg/day is antidepressant effective dose in rats. When SJW was administered for 10 days, the amounts of multidrug resistance protein 2 (MRP2), glutathione S-transferase-P (GST-P) and cytochrome P450 1A2 (CYP1A2) in the liver were increased to 304%, 252% and 357% of controls, respectively, although the amounts of P-glycoprotein and multidrug resistance protein 1 were not changed. Under the same conditions, an increase of MRP2 in the kidney was not observed. The increase in the levels of each protein was maximal at 10 days after SJW treatment and lasted for at least 30 consecutive days. These results suggest that SJW induces hepatic MRP2, GST-P and CYP1A2 overexpressions, and thus, it could affect drug metabolism, conjugation and disposition.
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Affiliation(s)
- Y Shibayama
- Department of Clinical Pharmacy and Pharmacology, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan
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Kawamura K, Moriyama M, Shiba N, Ozaki M, Tanaka T, Nojima T, Fujikawa-Yamamoto K, Ikeda R, Suzuki K. Centrosome hyperamplification and chromosomal instability in bladder cancer. Eur Urol 2003; 43:505-15. [PMID: 12705995 DOI: 10.1016/s0302-2838(03)00056-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [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: 12/07/2022]
Abstract
OBJECTIVE Chromosomal instability (CIN) is a common feature of malignant tumors. Centrosome hyperamplification (CH) occurs frequently in human cancers, and may be a contributing factor in CIN. In this study, we investigated the relationship between CH and CIN in bladder cancer. METHODS Clinical samples obtained by transurethral resection from 22 patients with bladder cancer were examined (histological grade G1, 5 cases; G2, 6 cases; G3, 11 cases). CH was evaluated by immunohistochemistry using anti-pericentrin antibody. CIN was evaluated by fluorescence in situ hybridization (FISH). FISH probes for pericentromeric regions of chromosomes 3, 7, and 17 were hybridized to touch preparations of nuclei from frozen tissues. We also analyzed the centrosome replication cycle of bladder cancer by laser scanning cytometry (LSC). RESULTS Of the 22 cases examined, 18 (81.8%) had centrosome hyperamplification: CH 0, 4 cases (18.1%); CH I, 5 cases (22.7%); CH II, 5 cases (22.7%); CH III, 8 cases (36.4%). The grade of CH was directly proportional to the histological grade (p=0.03, chi(2) test). LSC analysis showed that the centrosome replication cycle was well regulated in pathologically low-grade bladder cancer, which did not have chromosomal instability. In contrast, we found marked variability of centrosomes in pathologically high-grade bladder cancer, which had chromosomal instability. CH and CIN were both detected in pathologically high-grade tumors. The grade of CH was directly proportional to the CIN grade (p=0.0079, chi(2) test). CONCLUSION The results of the present study suggest that CH may be involved in CIN in bladder cancer.
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Affiliation(s)
- K Kawamura
- Department of Urology, Kanazawa Medical University, 1-1 Daigaku Uchinada, 920-0293, Ishikawa, Japan.
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Sugita T, Ikeda R, Shinoda T. Diversity among strains of Cryptococcus neoformans var. gattii as revealed by a sequence analysis of multiple genes and a chemotype analysis of capsular polysaccharide. Microbiol Immunol 2002; 45:757-68. [PMID: 11791669 DOI: 10.1111/j.1348-0421.2001.tb01312.x] [Citation(s) in RCA: 43] [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: 11/30/2022]
Abstract
We demonstrated the diversity of Cryptococcus neoformans var. gattii strains by a sequence analysis of multiple genes: (i) the intergenic spacer (IGS) 1 and 2 regions of the rRNA gene; (ii) the internal transcribed spacer (ITS) region, including 5.8S of the rRNA gene; (iii) TOP1 (topoisomerase); and (iv) CAP59. In these studies, we compared C. neoformans var. gattii with varieties grubii, and neoformans of C. neoformans. Phylogenetic analysis indicated that both C. neoformans var. grubii and C neoformans var. neoformans are monophyletic, but C. neoformans var. gattii showed polyphyletic. C. neoformans var. gattii can be divided into three phylogenetic groups, I, II, and III, with high bootstrap support. Phylogenetic group I contains serotype B and C strains, and groups II and III include serotype B strains. Because the serotype B strains of C. neoformans var. gattii exhibited more genetic divergence, the serological characteristics and chemotypes of their capsular polysaccharide were further investigated. No remarkable difference among the serotype B strains was found in the reactivities to factor serum 5, which is specific for serotype B. The NMR spectra of the capsular polysaccharide from serotype B strains could be divided into three characteristic patterns, but the chemical shifts were very similar. These results suggested that the serotype B strain of C. neoformans var. gattii has more genetic diversity than the serotype C strain of C. neoformans var. gattii or the varieties grubii and neoformans of C. neoformans, but there was no correlation between genotype and chemotype.
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Affiliation(s)
- T Sugita
- Department of Microbiology, Meiji Pharmaceutical University, Noshio, Kiyose, Tokyo, Japan.
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Sugita T, Takashima M, Ikeda R, Nakase T, Shinoda T. Intraspecies diversity of Cryptococcus albidus isolated from humans as revealed by sequences of the internal transcribed spacer regions. Microbiol Immunol 2002; 45:291-7. [PMID: 11386419 DOI: 10.1111/j.1348-0421.2001.tb02621.x] [Citation(s) in RCA: 24] [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: 11/30/2022]
Abstract
The basidiomycetous yeast, Cryptococcus albidus, shows intraspecies diversity, but it is rarely isolated from immunocompromised patients. Nineteen strains of C. albidus, including nine clinical isolates, were re-classified by sequences of their rRNA internal transcribed spacer (ITS) regions. The nine clinical isolates were genetically diverse and included both C. albidus and C. diffluens. One clinical isolate, recovered from the blood of an AIDS patient, represented a new species. Only small differences were found in the biochemical and serological characteristics of C. albidus and C. diffluens. All isolates were sensitive to amphotericin B, but several isolates were resistant to fluconazole and itraconazole. C. albidus heterogeneity should be taken into consideration when identifying clinical isolates.
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Affiliation(s)
- T Sugita
- Department of Microbiology, Meiji Pharmaceutical University, Kiyose, Tokyo, Japan.
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Krockenberger MB, Canfield PJ, Kozel TR, Shinoda T, Ikeda R, Wigney DI, Martin P, Barnes K, Malik R. An immunohistochemical method that differentiates Cryptococcus neoformans varieties and serotypes in formalin-fixed paraffin-embedded tissues. Med Mycol 2001. [DOI: 10.1080/714031068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Ikeda R, Aiyama S, Tsujimura T, Okamoto K. Developmental changes in the fine structure and histochemical properties of mucous cells in the parotid gland of the infant Japanese macaque. Arch Histol Cytol 2001; 64:545-53. [PMID: 11838714 DOI: 10.1679/aohc.64.545] [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: 11/11/2022]
Abstract
Mucous cells have been known to occur in the terminal portions of the parotid gland in a few species of mammals during a limited period of their development. The aim of this study was to examine the occurrence and features of mucous cells in the parotid gland of the infant Japanese macaque. Light microscopy revealed that mucous cells in the macaque parotid gland were present in the terminal clusters and acini at postnatal day 15, were less prevalent at day 30, and continued to decrease in number over 3 months. Mucous cells were no longer recognized in the parotid gland in 6-month-old macaques. Electron microscopy showed that the mucous cells contained electron-lucent secretory granules and bipartite or tripartite secretory granules. By 3 months of age, there was a scarcity of mucous cells and a concomitant increase in transitional cells. These transitional cells were intermediate in structure between mucous and serous cells, and contained three types of granules: electron-lucent, bipartite or tripartite, and electron-dense. None of the cells showed apoptotic figures. Lectin histochemistry indicated that the mucous cells in the early postnatal period had sugar residues identical in nature to those seen in the granules from mature serous cells in the glands of 3-month-old macaques. Immunohistochemistry using an antibody against human alpha-amylase showed a weakly positive reactivity in the secretory granules of the mucous cells, starting from day 15. In the transitional cells, the electron-dense granules showed a stronger immunoreactivity than either the electron-lucent granules or the heterogeneously structured granules. These results suggest that the secretory granules of mucous cells have characteristics in common with those of serous cells, and that during the transitional period the mucous granules change from the initial electron-lucent to hetorogenous forms, finally becoming the electron-dense granules. The mucous cells in the parotid gland of the juvenile Japanese macaque are therefore suggested to be converted into serous cells.
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Affiliation(s)
- R Ikeda
- Department of Histology, The Nippon Dental University School of Dentistry at Tokyo, Japan.
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Mori S, Takao S, Ikeda R, Noma H, Mataki Y, Wang X, Akiyama S, Aiko T. Role of thymidine phosphorylase in Fas-induced apoptosis. Hum Cell 2001; 14:323-30. [PMID: 11925935] [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: 02/24/2023]
Abstract
Thymidine phosphorylase (TP) has chemotactic and angiogenic activity in vitro, and it promotes tumor growth and inhibits apoptosis in vivo. It plays a key role in the invasiveness and metastasis of TP-expressing solid tumors. KB/TP cells transfected with a TP cDNA have been shown to be resistant to hypoxia-induced apoptosis, suggesting that TP has effects on tumor growth and cell death independent of its effects on angiogenesis. However, the mechanisms of cell death inhibition by TP are unknown. In the present study, we demonstrate that caspase-8 is cleaved in control transfectant KB cells early on during Fas-induced apoptosis. Caspase-8 activation leads to the loss of mitochondrial membrane potential, followed by the release of cytochrome c, the activation of caspase-3, and apoptosis. In contrast, Fas-induced caspase-8 cleavage is inhibited in KB/TP cells, which lead to inhibition of the downstream apoptotic cascade and inhibition of apoptosis. These findings indicate that TP plays an important role in intracellular apoptotic signal transduction in the Fas-induced apoptotic pathway. Therefore, inhibition of TP may suppress the progression of TP-overexpressing solid tumors by inducing apoptosis.
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Affiliation(s)
- S Mori
- First Department of Surgery, Kagoshima University School of Medicine, Kagoshima, Japan
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39
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Krockenberger MB, Canfield PJ, Kozel TR, Shinoda T, Ikeda R, Wigney DI, Martin P, Barnes K, Malik R. An immunohistochemical method that differentiates Cryptococcus neoformans varieties and serotypes in formalin-fixed paraffin-embedded tissues. Med Mycol 2001; 39:523-33. [PMID: 11798058 DOI: 10.1080/mmy.39.6.523.533] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [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] [Indexed: 10/20/2022] Open
Abstract
An immunohistochemical method for determining the variety of Cryptococcus neoformans in formalin-fixed paraffin-embedded tissues was developed using mAbs 471, 302 and CRND8. The method was validated primarily using veterinary patients for which both formalin-fixed lesions and a cultured isolate were available. L-Canavanine glycine bromothymol blue (CGB) agar and the 'Crypto-Check' kit were used to determine the variety and serotype, respectively, of cultured isolates. Immunohistochemistry accurately predicted the C. neoformans variety in all tissue specimens. The CGB agar method of determining C. neoformans variety gave the same result as immunohistochemistry for 30/31 specimens. For the single discordant isolate, the serotype, random amplification of polymorphic DNA profile, microscopic and colony morphology all supported the immunohistochemical staining pattern in suggesting C. neoformans var. gattii; however, the CGB agar result was at variance. Of the C. neoformans var. neoformans cases, immunohistochemistry was congruent with variety for 13/13 cases and with serotyping for 10/13 cases. The three discordant cases were classified as having some serotype D reactivity by immunohistochemistry, but were considered to be serotype A using the Crypto-Check kit. This new method should prove a valuable epidemiological tool in studies of cryptococcosis, especially in the veterinary setting where archival tissue specimens may exist but corresponding mycological data is typically absent. The versatility of this method will expand in the future as other monoclonal antibodies with different specificities are developed.
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Affiliation(s)
- M B Krockenberger
- Faculty of Veterinary Science, The University of Sydney, New South Wales, Australia.
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40
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Abstract
A new concept for the design and laccase-catalyzed preparation of "artificial urushi" from new urushiol analogues is described. The curing proceeded under mild reaction conditions to produce the very hard cross-linked film (artificial urushi) with a high gloss surface. A new cross-linkable polyphenol was synthesized by oxidative polymerization of cardanol, a phenol derivative from cashew-nut-shell liquid, by enzyme-related catalysts. The polyphenol was readily cured to produce the film (also artificial urushi) showing excellent dynamic viscoelasticity.
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Affiliation(s)
- S Kobayashi
- Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Japan.
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41
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Sugita T, Nakajima M, Ikeda R, Niki Y, Matsushima T, Shinoda T. A nested PCR assay to detect DNA in sera for the diagnosis of deep-seated trichosporonosis. Microbiol Immunol 2001; 45:143-8. [PMID: 11293480 DOI: 10.1111/j.1348-0421.2001.tb01282.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Deep-seated trichosporonosis caused by Trichosporon asahii has a high mortality rate and a very poor prognosis. New species-specific oligonucleotide primers for T. asahii were developed from a sequence analysis of rRNA genes that included the internal transcribed spacer regions. A nested PCR assay with specific primers was used to examine 11 serum samples from 7 patients, who were diagnosed with deep-seated trichosporonosis histologically at autopsy. In addition, Trichosporon cell wall polysaccharide (PS) was detected by a latex agglutination (LA) test. Of 11 samples, seven had a positive LA test, and T. asahii DNA was also detected with the nested PCR assay. Of the four samples in which PS antigen was not detected, the nested PCR of two samples was positive. Our new nested PCR assay may be used as an adjunct to conventional methods for diagnosing T. asahii infection.
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Affiliation(s)
- T Sugita
- Department of Microbiology, Meiji Pharmaceutical University, Kiyose, Tokyo, Japan.
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Ichikawa T, Nishikawa A, Ikeda R, Shinoda T. Structural studies of a cell wall polysaccharide of Trichosporon asahii containing antigen II. Eur J Biochem 2001; 268:5098-106. [PMID: 11589701 DOI: 10.1046/j.0014-2956.2001.02438.x] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The structure of a cell-wall polysaccharide containing antigen II from Trichosporon asahii was investigated. A purified glucuronoxylomannan (GXM) antigen was found to contain O-acetyl groups that contribute to the serological reactivity. The structure of GXM was analyzed by partial acid hydrolysis, methylation analysis, controlled Smith degradation, NMR studies, and fluorophore-assisted carbohydrate electrophoresis. GXM has an alpha-(1-->3)-D-mannan backbone with a beta-D-glucopyranosyluronic acid residue bound to O-2 of a mannopyranosyl residue and the same number of beta-D-xylopyranosyl residues as mannose. Side chains of beta-D-xylopyranosyl-D-xylopyranose, forming a nonreducing terminus, and beta-D-xylopyranosyl residues were attached to O-2, O-4, and O-6 of the mannose residues.
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Affiliation(s)
- T Ichikawa
- Department of Microbiology, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
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Abstract
BACKGROUND The aim of this study was to characterize the lymph vessels in different parts of the gastrointestinal tract and also to evaluate morphometric changes in these vessels during cirrhotic portal hypertension. METHODS Sixteen patients with cirrhotic portal hypertension and 18 control subjects without portal hypertension were enrolled in the study. Tissue specimens were collected at autopsy or surgery, and were stained enzyme histochemically, using 5'-nucleotidase and alkaline phosphatase to distinguish lymph vessels and blood vessels, respectively. The numbers of vessels and their luminal areas were estimated using computer graphics software (National Institutes of Health [NIH] image program). RESULTS The numbers and luminal areas of the lymph vessels varied considerably among the different organs of the gastrointestinal tract, both in controls and in the patients with cirrhotic portal hypertension. There was no significant difference in the numbers of lymph vessels between controls and patients with cirrhotic portal hypertension. However, the luminal area of the lymph vessels in the esophagus and stomach was significantly greater in the patients with cirrhotic portal hypertension than in the controls. These differences in lymph vessels were not seen in the small intestine and colon. CONCLUSIONS These data indicate that dilatation of lymph vessels may be related to the absorption of excess interstitial fluid, resulting from congestion, in cirrhotic portal hypertension.
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Affiliation(s)
- R Ikeda
- Third Department of Internal Medicine, Ehime University School of Medicine, Onsen-gun, Japan
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Makiura R, Nagasawa I, Kimura N, Ishimaru S, Kitagawa H, Ikeda R. An unusual six-co-ordinate platinum(II) complex containing a neutral I2 ligand. Chem Commun (Camb) 2001:1642-3. [PMID: 12240422 DOI: 10.1039/b103648n] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present paper deals with a rare platinum(II) complex containing the kappa-I2 ligand, which is an unusual example of a six-co-ordinated octahedral platinum(II) complex.
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Affiliation(s)
- R Makiura
- Department of Chemistry, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan
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Shiono Y, Ikeda R, Hayashi H, Wakusawa S, Sanae F, Takikawa T, Imaizumi Y, Yano M, Yoshioka K, Kawanaka M, Yamada G. C282Y and H63D mutations in the HFE gene have no effect on iron overload disorders in Japan. Intern Med 2001; 40:852-6. [PMID: 11579943 DOI: 10.2169/internalmedicine.40.852] [Citation(s) in RCA: 21] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE The gene responsible for hereditary hemochromatosis close to the human leukocyte antigen A locus was previously identified and designated as HFE. This study was performed to evaluate the clinical significance of two mutations, C282Y and H63D of HFE, in Japanese patients with hepatic iron overload. PATIENTS AND METHODS We examined C282Y and H63D in 11 patients with primary hemochromatosis, 94 patients with chronic hepatitis C, 54 patients with miscellaneous liver diseases, and 151 healthy volunteers. The HFE gene region of DNA samples extracted from peripheral leukocytes was amplified by polymerase chain reaction. Restriction enzyme analysis was performed using SnaBI for C282Y and BclI for H63D. Direct sequence analysis was then performed when products suggested the presence of a mutation. RESULTS All the subjects studied were free from C282Y. None of the patients with hemochromatosis had H63D. One patient with chronic hepatitis C was homozygous, and 4 patients were heterozygous for H63D. Two patients with alcoholic liver disease were heterozygous for H63D. The prevalence of chromosomes with H63D was 6/188 (3.2%) in patients with chronic hepatitis C, 2/108 (1.9%) in patients with miscellaneous liver diseases, and 8/302 (2.6%) in healthy volunteers. These differences were not significant. CONCLUSION Our results suggested that neither C282Y nor H63D in HFE affect Japanese patients with hemochromatosis or chronic hepatitis C.
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Affiliation(s)
- Y Shiono
- Department of Medicine, Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Ishikawa
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Murakoshi M, Ikeda R, Fukui N. The effects of chlormadinone acetate (CMA), antiandrogen, on the pituitary, testis, prostate and adrenal gland of the dog with spontaneous benign prostatic hyperplasia. J Toxicol Sci 2001; 26:119-27. [PMID: 11552295 DOI: 10.2131/jts.26.119] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 11/02/2022]
Abstract
The effect of chlormadinone acetate (CMA), a synthetic steroidal antiandrogen, on spontaneous benign prostatic hyperplasia (BPH) in dogs was investigated. Male beagle dogs (5-8 years old) were divided into four experimental group. Group 1 consisted of untreated controls. Groups 2 and 3 received CMA 0.03 and 0.1 mg/kg/day, p.o., respectively, for 6 months. In group 1, glandular hyperplasia of the prostate was clearly detected. The glandular epithelial cells showed uniformly intense nuclear staining for androgen receptor (AR). AR was also localized in the nuclei of the fibro-muscular stromal cells. In groups 2 and 3, CMA produced marked atrophy of the glandular epithelium. The interacinar fibro-muscular stroma was prominent. The nuclear staining for AR in both epithelial and stromal cells was remarkably decreased. In addition, a histopathological study showed that CMA medication for 6 months exerted no effect on the testes and adrenal glands or on immunoreactive positive cells to LH- and ACTH-antibody (pituitary LH- and ACTH-cells). Therefore, it is concluded that CMA (0.03 and 0.1 mg/kg) causes regression of spontaneous canine BPH without any histopathological effects on the testes, adrenal glands or pituitary LH- and ACTH-cells.
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Affiliation(s)
- M Murakoshi
- Safety Research Department, Teikoku Hormone Mfg. Co., Ltd., 1604 Shimosakunobe, Takatsu-ku, Kawasaki-city, Kanagawa 213-8522, Japan
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Takada K, Aiyama S, Ikeda R. Morphological and histochemical changes in the secretory granules of mucous cells in the early postnatal mouse parotid gland. Arch Histol Cytol 2001; 64:259-66. [PMID: 11575422 DOI: 10.1679/aohc.64.259] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
It has previously been known that the developing parotid glands in humans and rats contain mucous cells in their terminal clusters and acini, but these cells disappear within a short period of time. Using rat parotid glands, IKEDA and AIYAMA (1997, 1999) suggested that the mucous cells might change into serous cells in the early postnatal period, but it is uncertain whether mucous cells appear only in the developing parotid gland of a few species such as humans and rats, or whether the cell transformation actually occurs. To clarify these points, the present study investigated the developing mouse parotid glands. Light microscopy showed cells with secretory granules that stained extensively with PAS and alcian blue in the terminal clusters of a 1-day-old mouse parotid gland. Mucous cell numbers in the terminal clusters and the acini reached a peak on day 5 and decreased on day 7. By day 10, the mucous cells had disappeared altogether. Thus, the presence of mucous cells in the developing mouse parotid gland was confirmed. Electron microscopy showed granules of low-electron-density and bipartite granules in the mucous cells. Bipartite granules and highly electron-dense granules sometimes co-existed in a single cell. Immuno-electron microscopy revealed a positive reaction for amylase to the low-electron-density granules and the low-electron-density portions of the bipartite granules, in addition to the highly electron-dense granules and the electrondense cores of the bipartite granules. No mucous cells with nuclei displaying characteristics of apoptosis were recognizable. Lectin histochemistry both at the light and electron microscopic levels showed that the secretory granules in the mouse parotid gland mucous cells had sugar residues similar to those of the mature serous granules. These findings demonstrate that mucous cells appear in the early postnatal mouse parotid gland, and that almost all of these cells may be converted into serous cells.
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Affiliation(s)
- K Takada
- Department of Histology, The Nippon Dental University School of Dentistry at Tokyo, Japan.
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Sugita T, Ichikawa T, Matsukura M, Sueda M, Takashima M, Ikeda R, Nishikawa A, Shinoda T. Genetic diversity and biochemical characteristics of Trichosporon asahii isolated from clinical specimens, houses of patients with summer-type-hypersensitivity pneumonitis, and environmental materials. J Clin Microbiol 2001; 39:2405-11. [PMID: 11427546 PMCID: PMC88162 DOI: 10.1128/jcm.39.7.2405-2411.2001] [Citation(s) in RCA: 25] [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: 11/20/2022] Open
Abstract
Trichosporon asahii, which is distributed in the environment, is the major causative agent of the opportunistic infection trichosporonosis, and it also causes summer-type hypersensitivity pneumonitis (SHP). Random amplification of polymorphic DNA analysis was used to determine the intraspecies diversity of 39 T. asahii isolates from clinical specimens, SHP patients' houses, and environmental materials. The three primers used revealed 46 polymorphic bands. A phenogram was generated by the unweighted pair-group method with arithmetic mean. Clinical isolates formed a cluster, characterized by a 90% matching coefficient, but they did not cluster with strains isolated from SHP patients' houses or environmental sources. In addition, the biochemical characteristics of 86 strains from three sources were examined with 31 compounds using an ID32C kit, and a phenogram was constructed. The phenogram consisted of three major clusters. Cluster I included most of the clinical SHP isolates, and cluster II included most of the environmental isolates. Cluster III contained only one strain. A remarkable difference was found in the abilities of the strains belonging to clusters I and II to utilize six compounds. These results suggest that the genetic diversity and biochemical characteristics of T. asahii seem to be related to the source of the isolate. We also found a specific DNA fragment for the clinical isolates and strains isolated from SHP patients' houses.
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Affiliation(s)
- T Sugita
- Department of Microbiology, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo, 204-8588 Japan.
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Murakoshi M, Ikeda R, Fukui N, Nakayama T. Relationship between prostatic atrophy and apoptosis in the canine spontaneous benign prostatic hyperplasia (BPH) following chlormadinone acetate (CMA). Tokai J Exp Clin Med 2001; 26:71-5. [PMID: 11806444] [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: 02/23/2023]
Abstract
The effect of a synthetic steroidal antiandrogen, chlormadinone acetate (CMA), on spontaneous benign prostatic hyperplasia (BPH) in dogs was investigated. Male beagle dogs (5-8 years old) were divided into four experimental groups. Group 1 consisted of untreated controls. Groups 2 to 4 received CMA 0.03, 0.1, and 0.3 mg/kg/day, p.o., respectively, for 6 months. In group 1, glandular hyperplasia of the prostate was clearly detected. In groups 2 to 4, CMA produced marked atrophy of the glandular epithelium. The interacinar fibro-muscular stroma was prominent. To evaluate the frequency of apoptosis, we counted the positive cells stained by the nick end labeling method. In group 1, the apoptotic index was 0.76 +/- 0.03%. In groups 2 to 4, apoptotic index were 15.41 +/- 1.26%, 2.63 +/- 0.98% and 1.45 +/- 0.85%, respectively. Apoptotic cell death was mainly observed in the glandular may be epithelial cells. Based on our data, regression of BPH after treatment with CMA apoptotic cell death.
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Affiliation(s)
- M Murakoshi
- Safety Research Department, Teikoku Hormone Mfg Co, Ltd, Kawasaki, Japan
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Abstract
MDR3 is a phospholipid translocator homologous to MDR1 P-glycoprotein. MDR3 localizes to the canalicular membrane and contributes to the secretion of bile. To elucidate the role of protein kinase C in the regulation of MDR3 gene expression, we investigated the effect of phorbol 12-myristate 13-acetate (PMA) on the level of MDR3 mRNA in human Chang liver cells by a reverse transcription-polymerase chain reaction method. The steady-state expression of MDR3 mRNA was decreased by PMA after treatment for 8-20 hr and at concentrations of 1-100 nM. PMA also decreased the doxorubicin-induced expression of MDR3 mRNA. 4alpha-Phorbol 12,13-didecanoate, a negative control compound, did not decrease the expression at these concentrations. The down-regulatory effect of PMA was partially suppressed by the protein kinase C inhibitors 2-[1-(3-dimethylaminopropyl)-1H-indol-3-yl]-3-(1H-indol-3-yl)maleimide (GF109203X) and calphostin C. Furthermore, cycloheximide, a protein synthesis inhibitor, antagonized the effect of PMA. From these results, it was suggested that the level of MDR3 mRNA was negatively regulated by a protein kinase C- and protein synthesis-dependent system and that the system regulated both the stable and inducible expression of MDR3 mRNA.
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Affiliation(s)
- S Wakusawa
- Department of Medicine, Faculty of Pharmaceutical Sciences, Hokuriku University, Ho-3, Kanagawa-machi, 920-1181, Kanazawa, Japan.
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