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Sootome H, Muraoka H, Aoyagi Y, Kato M, Hirai H. Covalent FGFR inhibitor futibatinib exhibits sustained antitumor effects compared with ATP-competitive inhibitors by being less prone to ontarget resistance. Eur J Cancer 2022. [DOI: 10.1016/s0959-8049(22)01005-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: 11/03/2022]
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Mirtl M, T Borer E, Djukic I, Forsius M, Haubold H, Hugo W, Jourdan J, Lindenmayer D, McDowell WH, Muraoka H, Orenstein DE, Pauw JC, Peterseil J, Shibata H, Wohner C, Yu X, Haase P. Genesis, goals and achievements of Long-Term Ecological Research at the global scale: A critical review of ILTER and future directions. Sci Total Environ 2018; 626:1439-1462. [PMID: 29898550 DOI: 10.1016/j.scitotenv.2017.12.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 11/28/2017] [Accepted: 12/01/2017] [Indexed: 06/08/2023]
Abstract
Since its founding in 1993 the International Long-term Ecological Research Network (ILTER) has gone through pronounced development phases. The current network comprises 44 active member LTER networks representing 700 LTER Sites and ~80 LTSER Platforms across all continents, active in the fields of ecosystem, critical zone and socio-ecological research. The critical challenges and most important achievements of the initial phase have now become state-of-the-art in networking for excellent science. At the same time increasing integration, accelerating technology, networking of resources and a strong pull for more socially relevant scientific information have been modifying the mission and goals of ILTER. This article provides a critical review of ILTER's mission, goals, development and impacts. Major characteristics, tools, services, partnerships and selected examples of relative strengths relevant for advancing ILTER are presented. We elaborate on the tradeoffs between the needs of the scientific community and stakeholder expectations. The embedding of ILTER in an increasingly collaborative landscape of global environmental observation and ecological research networks and infrastructures is also reflected by developments of pioneering regional and national LTER networks such as SAEON in South Africa, CERN/CEOBEX in China, TERN in Australia or eLTER RI in Europe. The primary role of ILTER is currently seen as a mechanism to investigate ecosystem structure, function, and services in response to a wide range of environmental forcings using long-term, place-based research. We suggest four main fields of activities and advancements for the next decade through development/delivery of a: (1) Global multi-disciplinary community of researchers and research institutes; (2) Strategic global framework and strong partnerships in ecosystem observation and research; (3) Global Research Infrastructure (GRI); and (4) a scientific knowledge factory for societally relevant information on sustainable use of natural resources.
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Affiliation(s)
- M Mirtl
- Environment Agency Austria, Spittelauer Lände 5, 1090 Wien, Austria; Helmholtz Centre for Environmental Research - UFZ, Department of Community Ecology, Theodor-Lieser-Strasse 4, D-06120 Halle, Germany.
| | - E T Borer
- Department of Ecology, Evolution, and Behavior, 1987 Upper Buford Circle, Suite 100, University of Minnesota, St. Paul, MN 55108, USA
| | - I Djukic
- Environment Agency Austria, Spittelauer Lände 5, 1090 Wien, Austria
| | - M Forsius
- Finnish Environment Institute SYKE, P.O.Box 140, FI-00251 Helsinki, Finland
| | - H Haubold
- Environment Agency Austria, Spittelauer Lände 5, 1090 Wien, Austria
| | - W Hugo
- South African Environmental Observation Network (SAEON) of the National Research Foundation (NRF), 41 De Havilland Crescent, The Woods, Persequor Park, PO Box 2600, Pretoria 0001, South Africa
| | - J Jourdan
- Senckenberg Research Institute and Natural History Museum Frankfurt, Department of River Ecology and Conservation, Clamecystraße 12, 63571 Gelnhausen, Germany
| | - D Lindenmayer
- Fenner School of Environment and Society, Frank Fenner Building (Bldg 141), The ANU College of Medicine, Biology & Environment, The Australian National University, Acton, ACT 2601, Australia
| | - W H McDowell
- Department of Natural Resources and the Environment, University of New Hampshire, Rudman Hall, 46 College Road, Durham, NH 03824, USA
| | - H Muraoka
- River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - D E Orenstein
- Faculty of Architecture and Town Planning, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - J C Pauw
- South African Environmental Observation Network (SAEON) of the National Research Foundation (NRF), 41 De Havilland Crescent, The Woods, Persequor Park, PO Box 2600, Pretoria 0001, South Africa
| | - J Peterseil
- Environment Agency Austria, Spittelauer Lände 5, 1090 Wien, Austria
| | - H Shibata
- Field Science Center for Northern Biosphere, Hokkaido University, N9 W9, Kita-ku, Sapporo 060-0809, Japan
| | - C Wohner
- Environment Agency Austria, Spittelauer Lände 5, 1090 Wien, Austria
| | - X Yu
- Chinese Ecosystem Research Network (CERN), Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Chaoyang District, Beijing 100101, China
| | - P Haase
- Senckenberg Research Institute and Natural History Museum Frankfurt, Department of River Ecology and Conservation, Clamecystraße 12, 63571 Gelnhausen, Germany; Faculty of Biology, University of Duisburg-Essen, 45141 Essen, Germany
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Muraoka H, Yoshimura C, Tsuji S, Hashimoto A, Mizutani T, Ohkubo S, Matsuo K, Utsugi T, Iwasawa Y. TAS4464, a novel highly potent NEDD8 activating enzyme inhibitor, demonstrates anti-tumor efficacy in rituximab-resistant double-hit lymphoma models. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)33052-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kotaki T, Nishimura N, Ozawa M, Fujimori A, Muraoka H, Ogawa S, Korenaga T, Suzuki E, Oishi Y, Shibasaki Y. Synthesis of highly refractive and highly fluorescent rigid cyanuryl polyimines with polycyclic aromatic hydrocarbon pendants. Polym Chem 2016. [DOI: 10.1039/c5py01920f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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
A series of rigid cyanuryl polyimines, polyguanamines (PGs) bearing polycyclic aromatic hydrocarbon pendants were successfully synthesized from 2-substituted 4,6-dichloro-1,3,5-triazine and aromatic diamine monomers.
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Fujino T, Hatano M, Yao A, Nitta D, Muraoka H, Minatsuki S, Imamura T, Inaba T, Maki H, Kinugawa K, Komuro I. The Reliability of 6-Minute Walk Test to Predict Exercise Capacity in Patients With Pulmonary Hypertension. J Heart Lung Transplant 2015. [DOI: 10.1016/j.healun.2015.01.965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Ohkubo S, Muraoka H, Kodama Y, Ito K, Ito S, Hashimoto A, Yoshimura C, Utsugi T. 592 TAS-116, a highly selective inhibitor of heat shock protein 90a/β, inhibits tumor growth in biliary tract cancer mouse models. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70718-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: 11/24/2022]
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Hirahara N, Kaneda T, Sasaki Y, Fukuda T, Ito K, Kawashima Y, Muraoka H, Muramatsu T. Characteristic MR findings of rheumatic arthritis in the temporomandibular joints. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.393] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Muraoka H, Kaneda T, Sasaki Y, Kawashima Y, Fukuda T, Muramatsu T, Ito K, Hirahara N. Relationship between joint effusion and parotid lymph nodes in temporomandibular disorders. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.398] [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: 11/28/2022]
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Kaneda T, Kawashima Y, Sasaki Y, Suemitsu M, Okada H, Hayakawa Y, Sakae T, Muraoka H, Hirahara N. Clinical application of parameteric X-ray in diagnostic imaging: Preliminary study. J Oral Maxillofac Surg 2014. [DOI: 10.1016/j.joms.2014.06.312] [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: 10/24/2022]
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Hiroshima Y, Miyamoto H, Nakamura F, Masukawa D, Yamamoto T, Muraoka H, Kamiya M, Yamashita N, Suzuki T, Matsuzaki S, Endo I, Goshima Y. The protein Ocular albinism 1 is the orphan GPCR GPR143 and mediates depressor and bradycardic responses to DOPA in the nucleus tractus solitarii. Br J Pharmacol 2014; 171:403-14. [PMID: 24117106 DOI: 10.1111/bph.12459] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Revised: 09/12/2013] [Accepted: 09/30/2013] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND AND PURPOSE L-DOPA is generally considered to alleviate the symptoms of Parkinson's disease by its conversion to dopamine. We have proposed that DOPA is itself a neurotransmitter in the CNS. However, specific receptors for DOPA have not been identified. Recently, the gene product of ocular albinism 1 (OA1) was found to exhibit DOPA-binding activity. Here, we have investigated whether OA1 is a functional receptor of DOPA in the nucleus tractus solitarii (NTS). EXPERIMENTAL APPROACH We examined immunohistochemical expression of OA1 in the NTS, and the effects of DOPA microinjected into the depressor sites of NTS on blood pressure and heart rate in anaesthetized rats, with or without prior knock-down of OA1 in the NTS, using shRNA against OA1. KEY RESULTS Using a specific OA1 antibody, OA1-positive cells and nerve fibres were found in the depressor sites of the NTS. OA1 expression in the NTS was markedly suppressed by microinjection into the NTS of adenovirus vectors carrying the relevant shRNA sequences against OA1. In animals treated with OA1 shRNA, depressor and bradycardic responses to DOPA, but not those to glutamate, microinjected into the NTS were blocked. Bilateral injections into the NTS of DOPA cyclohexyl ester, a competitive antagonist against OA1, suppressed phenylephrine-induced bradycardic responses without affecting blood pressure responses. CONCLUSION AND IMPLICATIONS OA1 acted as a functional receptor for DOPA in the NTS, mediating depressor and bradycardic responses. Our results add to the evidence for a central neurotransmitter role for DOPA, without conversion to dopamine.
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Affiliation(s)
- Y Hiroshima
- Department of Gastroenterological Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan; Department of Molecular Pharmacology and Neurobiology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Maki H, Hatano M, Muraoka H, Minatsuki S, Fujino T, Imamura T, Inaba T, Yao A, Kinugawa K, Komuro I. Pulmonary Vasodilators Can Reverse Out-of-Proportional Pulmonary Hypertension in Patients with Left Cardiac Disease. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Imamura T, Kinugawa K, Hatano M, Muraoka H, Fujino T, Inaba T, Maki H, Kinoshita O, Nawata K, Kyo S, Ono M. Low Cardiac Output Stimulates Vasopressin Release in Patients with Stage D Heart Failure - Its Relevance to Poor Prognosis and Reversal by Surgical Treatment. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Kato N, Kinugawa K, Endo M, Kagami Y, Imamura T, Muraoka H, Minatsuki S, Inaba T, Maki H, Shiga T, Hatano M, Yao A, Kyo S, Komuro I, Ono M. Differential Impacts of Implantable Ventricular Assist Device on Quality of Life and Depression in Patients with Heart Failure and Their Caregivers. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.277] [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: 10/27/2022] Open
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Tsugawa H, Suzuki H, Muraoka H, Ikeda F, Hirata K, Matsuzaki J, Saito Y, Hibi T. Enhanced bacterial efflux system is the first step to the development of metronidazole resistance in Helicobacter pylori. Biochem Biophys Res Commun 2010; 404:656-60. [PMID: 21147064 DOI: 10.1016/j.bbrc.2010.12.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 12/07/2010] [Indexed: 10/18/2022]
Abstract
Although metronidazole (Mtz) is an important component of Helicobacter pylori eradication regimens, it has been pointed out that the increasing use of Mtz may result in increase in the incidence of Mtz-resistant strains. The present study was designed to examine the initial mechanism of resistance acquisition of H. pylori to Mtz. After 10 Mtz-susceptible strains were cultured on plates containing sub-inhibitory concentrations of Mtz, the MIC of Mtz for 9 of the 10 strains increased to levels of the Mtz-resistant strains. In the Mtz-resistance-induced strains, the expression of the TolC efflux pump (hefA) was significantly increased under Mtz exposure, without the reduction of the Mtz-reductive activity. Our finding suggests that overexpression of hefA may be the initial step in the acquisition of Mtz resistance in H. pylori.
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Affiliation(s)
- Hitoshi Tsugawa
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Hirata K, Suzuki H, Nishizawa T, Tsugawa H, Muraoka H, Saito Y, Matsuzaki J, Hibi T. Contribution of efflux pumps to clarithromycin resistance in Helicobacter pylori. J Gastroenterol Hepatol 2010; 25 Suppl 1:S75-9. [PMID: 20586871 DOI: 10.1111/j.1440-1746.2009.06220.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS Although clarithromycin (CLR) is one of the most commonly recommended component drugs of Helicobacter pylori eradication regimens, the prevalence of CLR-resistant H. pylori has been increasing. It is well known that CLR resistance is associated with point mutations in 23S rRNA, but an active multidrug efflux mechanism of H. pylori may also play a role in its drug resistance. At least four gene clusters have been identified as efflux pump systems in H. pylori and the present study was designed to investigate their role in the CLR resistance of clinical isolates of H. pylori. METHODS Fifteen CLR-resistant H. pylori strains (minimal inhibitory concentration [MIC]>or= 1 microg/mL) isolated from patients at Keio University Hospital were examined for expression of efflux pump mRNA by real-time polymerase chain reaction. In addition, the MIC of CLR in the presence or absence of Phe-Arg-beta-naphthylamide (PAbetaN), an efflux pump inhibitor (EPI), were determined. RESULTS In all 15 strains, efflux pump mRNA was expressed, and the MIC of CLR were decreased by using EPI, despite possessing 23s rRNA point mutations. In addition, the MIC of CLR was decreased by the EPI in a concentration-dependent fashion. CONCLUSION The efflux pump of H. pylori is associated with the development of resistance to CLR, in addition to 23S rRNA point mutations. Efflux pumps could be a novel target for reversing drug resistance in H. pylori.
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Affiliation(s)
- Kenro Hirata
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
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Hongo K, Goto T, Muraoka H, Kakizawa Y, Sakai K. IN10-MO-01 Surgery for the cavernous angioma in the brainstem, selection of a safe surgical approach and surgical results. J Neurol Sci 2009. [DOI: 10.1016/s0022-510x(09)70056-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Tsunoda A, Muraoka H, Yamada M, Komatsuzaki A. Helical CT and its three-dimensional image: Application for image-guided surgery in middle cranial fossa approach. MINIM INVASIV THER 2009. [DOI: 10.3109/13645709709153082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Suzuki S, Suzuki H, Nishizawa T, Kaneko F, Ootani S, Muraoka H, Saito Y, Kobayashi I, Hibi T. Past rifampicin dosing determines rifabutin resistance of Helicobacter pylori. Digestion 2009; 79:1-4. [PMID: 19142036 DOI: 10.1159/000191204] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2008] [Accepted: 11/25/2008] [Indexed: 02/04/2023]
Abstract
BACKGROUND Recently, the number of Helicobacter pylori isolates showing antibiotic resistance has been increasing. Rifabutin (RFB) is one of the possible candidates for H. pylori eradication. In the present study, the RFB minimum inhibitory concentrations (MICs) and the resistance-determining genes to RFB (rpoB) were examined to clarify the relationship between drug MICs, rpoB mutations, and past history of rifampicin (RFP) treatment. METHODS The MICs of RFB and rpoB mutations were examined for 48 strains with failure of H. pylori eradication in the University Hospital and 46 isolated from patients at a specialized hospital for chronic respiratory diseases without past H. pylori eradication. Past RFP treatment was also examined. RESULTS Eight of 94 strains showed high RFB MICs and 6 of the 8 strains showed rpoB point mutations. Although no strains showed high RFB MICs among 48 strains from the patients in the University Hospital, all 7 strains isolated from patients with past RFP treatment showed high RFB MICs (>or=0.12 mg/l). CONCLUSION Although RFB might be a potential candidate component of a new H. pylori eradication regimen following the first- or second-line failure, it should be used after examining a past history of RFP treatment.
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Affiliation(s)
- Shoji Suzuki
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
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Ito T, Kobayashi D, Uchida K, Takemura T, Nagaoka S, Kobayashi I, Yokoyama T, Ishige I, Ishige Y, Ishida N, Furukawa A, Muraoka H, Ikeda S, Sekine M, Ando N, Suzuki Y, Yamada T, Suzuki T, Eishi Y. Helicobacter pylori invades the gastric mucosa and translocates to the gastric lymph nodes. J Transl Med 2008; 88:664-81. [PMID: 18475258 DOI: 10.1038/labinvest.2008.33] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Helicobacter pylori has been considered to be non-invasive and to rarely infiltrate the gastric mucosa, even though there is an active Th1 immune response in the lamina propria of the H. pylori-infected stomach. To elucidate whether H. pylori invades the lamina propria and translocates to the gastric lymph nodes, we examined H. pylori in formalin-fixed and paraffin-embedded tissue sections of stomach and gastric lymph nodes obtained from 51 cancer patients using real-time PCR and immunohistochemistry (IHC) with a novel anti-H. pylori monoclonal antibody that recognizes lipopolysaccharides. Fresh gastric lymph nodes were used to culture for H. pylori. In 46 patients with H. pylori in the stomach, the bacterium was found in the lymph nodes from 21 patients by culture, 37 patients by PCR, and 29 patients by IHC. H. pylori captured by macrophages was found in the lamina propria of 39 patients. In the lymph nodes, the bacterium was found in many macrophages and a few interdigitating dendritic cells at the paracortical areas. H. pylori was also found in the intracellular canaliculi of parietal cells in 21 patients, but intracytoplasmic invasion into gastric epithelial cells was not identified. When compared to the commercially available anti-H. pylori antibodies, the novel antibody showed the highest sensitivity to detect H. pylori-positive macrophages, whereas no difference was found for H. pylori in the mucous layer. The H. pylori-positive macrophages in the lamina propria correlated with chronic gastritis as well as translocation of such cells to the lymph nodes. These results suggest that H. pylori-induced gastric epithelial damage allows the bacteria to invade the lamina propria and translocate to the gastric lymph nodes, which may chronically stimulate the immune system. The bacteria captured by macrophages, whether remaining alive or not, may contribute to the induction and development of H. pylori-induced chronic gastritis.
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Affiliation(s)
- Takashi Ito
- Department of Human Pathology, Tokyo Medical and Dental University Graduate School, Tokyo, Japan
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Nishizawa T, Suzuki H, Umezawa A, Muraoka H, Iwasaki E, Masaoka T, Kobayashi I, Hibi T. Rapid detection of point mutations conferring resistance to fluoroquinolone in gyrA of Helicobacter pylori by allele-specific PCR. J Clin Microbiol 2006; 45:303-5. [PMID: 17122023 PMCID: PMC1829027 DOI: 10.1128/jcm.01997-06] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Helicobacter pylori strains with reduced susceptibility to fluoroquinolones have a mutation at either codon 87 Asn or 91 Asp of the gyrA gene. A rapid test based on an allele-specific PCR (AS-PCR) was designed to detect the gyrA mutations. Clinical H. pylori isolates were obtained from the stomachs of 51 patients with H. pylori infections who showed treatment failure. The MICs of gatifloxacin (GAT) were determined by the agar dilution method. Identical genotyping results were obtained with AS-PCR and conventional PCR. The gyrA mutations of H. pylori causing reduced susceptibility to fluoroquinolones could be detected successfully by this method. A significant association was observed between the presence of mutations, as detected by AS-PCR, and the resistance of the strains to GAT. Moreover, genotyping by AS-PCR took less than 3 to 4 h. The AS-PCR method for the detection of gyrA mutations in H. pylori is useful for easy identification of fluoroquinolone-resistant strains of H. pylori.
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Affiliation(s)
- Toshihiro Nishizawa
- Department of Internal Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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Hasegawa M, Sato Y, Kanayama A, Matsuzaki K, Muraoka H, Amano A, Saika T, Kobayashi I. Antibacterial activity of tosufloxacin against major organisms detected from patients with respiratory or otorhinological infections: comparison with the results obtained from organisms isolated about 10 years ago. J Infect Chemother 2006; 12:152-6. [PMID: 16826349 DOI: 10.1007/s10156-006-0434-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2005] [Accepted: 02/16/2006] [Indexed: 10/24/2022]
Abstract
The minimum inhibitory concentrations (MICs) of tosufloxacin and other fluoroquinolone antimicrobials for Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella (Branhamella) catarrhalis, isolated, between January 2003 and July 2004, from patients suspected of having respiratory or otorhinological infections were determined. The results were compared with those for these organisms isolated in 1994, plus some H. influenzae strains isolated in 1998. Tosufloxacin was the most potent of all the antibiotics tested for antibacterial activity against S. pneumoniae (including penicillin-intermediate S. pneumoniae and penicillin-resistant S. pneumoniae). The MIC50 and MIC90 values did not differ from those obtained for the strains isolated in 1994. Fluoroquinolones exerted the most potent antibacterial activity against M. (B.) catarrhalis; the MICs for most of the strains were < or = 0.06 microg/ml; fluoroquinolones inhibited the growth of all the strains at 0.25 microg/ml or less. Fluoroquinolones showed the most potent antibacterial activity against H. influenzae strains isolated between 2003 and 2004, and in 1994, but, for one H. influenzae strain isolated, between 2003 and 2004, the MICs of fluoroquinolones were high. Some strains of S. pneumoniae and H. influenzae were resistant to fluoroquinolones. Genetic analysis showed that all of these strains had mutations in the quinolone resistance-determining region, but there were no differences according to the years of isolation. These results indicate that tosufloxacin has potent antibacterial activity against major organisms isolated from patients with respiratory or otorhinological infections; further, the results of the present study did not differ from those obtained about 10 years ago.
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Affiliation(s)
- Miyuki Hasegawa
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo, 174-8555, Japan
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Kobayashi I, Saika T, Muraoka H, Murakami K, Fujioka T. Helicobacter pylori isolated from patients who later failed H. pylori eradication triple therapy readily develop resistance to clarithromycin. J Med Microbiol 2006; 55:737-740. [PMID: 16687592 DOI: 10.1099/jmm.0.46316-0] [Citation(s) in RCA: 19] [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: 12/21/2022] Open
Abstract
In this study, the ease of selection of clarithromycin resistance was investigated in clarithromycin-susceptible Helicobacter pylori strains isolated from patients with H. pylori infection prior to the administration of triple-combination eradication therapy (clarithromycin plus amoxicillin plus a proton pump inhibitor). Clarithromycin-susceptible strains isolated from ten patients in whom the eradication therapy was successful and from six patients in whom the eradication therapy was unsuccessful were exposed serially to subinhibitory concentrations of clarithromycin. The number of transfers required for the MICs of the strains to increase by 8- and 32-fold were 6.6 and 7.2, respectively, in the successful eradication group, and as few as 2.4 and 1.5, respectively, in the unsuccessful eradication group. The number of transfers required for the A2142G or A2143G point mutation of the 23S rRNA gene to be detected in the strains were 5 and 8, respectively, for the strains in the successful eradication group, and 1 and 2, respectively, for the strains in the unsuccessful eradication group. These results suggest that patients in the unsuccessful eradication group were infected with strains of H. pylori that readily became resistant to clarithromycin on exposure to the drug.
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Affiliation(s)
- Intetsu Kobayashi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan
| | - Takeshi Saika
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan
| | - Hiroe Muraoka
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan
| | - Kazunari Murakami
- Department of General Medicine, Faculty of Medicine, Oita University, Hasama-machi, Oita 879-5593, Japan
| | - Toshio Fujioka
- Department of General Medicine, Faculty of Medicine, Oita University, Hasama-machi, Oita 879-5593, Japan
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Nishizawa T, Suzuki H, Kurabayashi K, Masaoka T, Muraoka H, Mori M, Iwasaki E, Kobayashi I, Hibi T. Gatifloxacin resistance and mutations in gyra after unsuccessful Helicobacter pylori eradication in Japan. Antimicrob Agents Chemother 2006; 50:1538-40. [PMID: 16569878 PMCID: PMC1426923 DOI: 10.1128/aac.50.4.1538-1540.2006] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A high resistance rate (47.9%) to gatifloxacin (GAT; 8-methoxy fluoroquinolone) in Helicobacter pylori (H. pylori) strains from 48 Japanese patients is observed after unsuccessful H. pylori eradication. A significant association between MICs for GAT equal to or above 1 microg/ml and mutations of the gyrA gene of H. pylori was demonstrated.
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Affiliation(s)
- Toshihiro Nishizawa
- Department of Internal Medicine, Keio University School of Medicine, and Department of Gastroenterology, Kitasato Institute Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
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25
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Matsushima M, Suzuki T, Kurumada T, Watanabe S, Watanabe K, Kobayashi K, Deguchi R, Masui A, Takagi A, Shirai T, Muraoka H, Kobayashi I, Mine T. Tetracycline, metronidazole and amoxicillin-metronidazole combinations in proton pump inhibitor-based triple therapies are equally effective as alternative therapies against Helicobacter pylori infection. J Gastroenterol Hepatol 2006; 21:232-6. [PMID: 16460479 DOI: 10.1111/j.1440-1746.2006.04171.x] [Citation(s) in RCA: 16] [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: 12/20/2022]
Abstract
BACKGROUND A proton pump inhibitor (PPI)-based triple therapy with clarithromycin (CAM) and amoxicillin (AMPC) is now a standard regimen for Helicobacter pylori (HP) eradication in Japan. However, the CAM-resistant rate has increased recently and alternative therapies are sorely needed. Therefore the aim of the present study was to evaluate the effectiveness and safety of the PPI-tetracycline (TC)-metronidazole (MNZ) regimen (the PTM regimen) as an alternative therapy in comparison with the PPI-AMPC-MNZ (PAM) regimen. METHODS Sixty-four HP-positive patients visiting the HP-eradication clinic in Tokai University Hospital from July 1998 to March 2003 were treated with either PTM or PAM as alternative therapies. The HP eradication was assessed by urea breath test (UBT), HP stool antigen test, or HP culture method more than 2 months after completion of the treatments. The drug resistances against CAM, AMPC, TC, and MNZ were assessed by the agar dilution method. RESULTS Fifty-six patients (26 PTM and 30 PAM) completed medication and evaluation of the eradication. The eradication rates of PTM were 82.8% (24/29) and 92.3% (24/26), while those of PAM were 74.3% (26/35) and 89.7% (26/29) by intention-to-treat and per-protocol analysis, respectively. The differences between the regimens were not statistically significant. There were no severe adverse effects observed in either of the regimens. The drug-resistance analyses showed 15 CAM- and one MNZ-resistant cases but no TC or AMPC resistance in the available 25 samples. CONCLUSION The PTM and PAM regimens were equally effective and safe as alternative HP eradication therapies. And PTM would be particularly useful in penicillin allergy cases.
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Affiliation(s)
- Masashi Matsushima
- Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan.
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Mine T, Muraoka H, Saika T, Kobayashi I. Characteristics of a clinical isolate of urease-negative Helicobacter pylori and its ability to induce gastric ulcers in Mongolian gerbils. Helicobacter 2005; 10:125-31. [PMID: 15810942 DOI: 10.1111/j.1523-5378.2005.00300.x] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
BACKGROUND We clinically obtained urease-negative mutant strains of Helicobacter pylori. The goal of this study was to investigate the ability of the urease-negative strain to colonize and subsequently damage the gastric mucosa in Mongolian gerbils. In addition, the genes encoding the urease production in the test strain were analyzed, and other genes encoding the virulence factors, cytotoxin-associated protein and vacuolating-cytotoxin were evaluated. MATERIALS AND METHODS The character of urease-negative isolates of H. pylori was defined. The identification of H. pylori was confirmed by polymerase chain reaction (PCR). The H. pylori isolate was transfected into Mongolian gerbils as previously described, which were followed up to 42 weeks, and the changes in their gastric mucosa were examined histologically. RESULTS AND CONCLUSION Fifteen Mongolian gerbils orally infected with 10(7) colony forming units of urease-negative H. pylori were killed at 4, 12, 24, 36 and 42 weeks (n = 3) after infection. Culture medium without urease-negative H. pylori was given to the Mongolian gerbils as control. H. pylori continued to exist in the subject's stomach and gastric ulceration was observed and compared with the control. Clinically obtained urease-negative H. pylori continued to exist for at least 42 weeks in the subject's stomach and it induced gastric ulcers. These data demonstrated that the urease in H. pylori was not a necessary factor in the formation of gastric ulcers in the Mongolian gerbil model.
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Affiliation(s)
- Tetsuya Mine
- Department of Internal Medicine, University of Tokai School of Medicine, Bohseidai, Isehara, Kanagawa 259-1193, Japan.
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27
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Kobayashi I, Muraoka H, Iyoda T, Nishida M, Hasegawa M, Yamaguchi K. Antimicrobial susceptibility testing of vancomycin-resistant Enterococcus by the VITEK 2 system, and comparison with two NCCLS reference methods. J Med Microbiol 2004; 53:1229-1232. [PMID: 15585502 DOI: 10.1099/jmm.0.45765-0] [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] [Indexed: 11/18/2022] Open
Abstract
We evaluated the automated VITEK 2 system (bioMérieux) for antimicrobial susceptibility testing of vancomycin-resistant Enterococcus (VRE). The results obtained with the VITEK 2 system were compared to those obtained using two NCCLS reference methods. The VITEK 2 system produced MICs for penicillin G, erythromycin and vancomycin that were very similar to those of the reference agar-dilution test with all results being within a twofold dilution. When MICs of teicoplanin for these isolates were measured by the agar-dilution method and VITEK 2 system, there was one ‘very major’ error and seven ‘minor’ errors. There were no ‘major’ errors for any of the antibiotics tested. When the results obtained by the micro broth-dilution method were compared with those obtained by the VITEK 2 system, there was one ‘very major’ error for teicoplanin by the VITEK 2 system, as was the case with the agar-dilution method. There were two ‘minor’ errors for erythromycin and seven ‘minor’ errors for teicoplanin. There were no ‘major’ errors for any of the antibiotics tested. The 35 VRE strains identified phenotypically by the VITEK 2 Advanced Expert System included nine of Enterococcus faecalis and 23 of Enterococcus faecium. Neither Enterococcus avium nor Enterococcus hirae were identified. A total of 32 phenotypes were classified into 22 VanA and 10 VanB strains. PCR genotyping demonstrated 23 vanA
+ and nine vanB
+ strains. There were differences between the VITEK 2 system results and those of PCR. Overall, 54.3 % of the test results were obtained within 7 h. All MIC values for the 35 VRE isolates were determined within 13 h of completing incubation. The VITEK 2 system is a simple method for accurately detecting vancomycin-resistant strains of Enterococcus and can be used to rapidly determine MICs.
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Affiliation(s)
- Intetsu Kobayashi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
| | - Hiroe Muraoka
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
| | - Takako Iyoda
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
| | - Minoru Nishida
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
| | - Miyuki Hasegawa
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
| | - Keizou Yamaguchi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories Inc., 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan 2Department of Microbiology, Toho University of Medicine, Tokyo, Japan
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Kobayashi I, Muraoka H, Saika T, Nishida M, Fujioka T, Nasu M. Micro-broth dilution method with air-dried microplate for determining MICs of clarithromycin and amoxycillin for Helicobacter pylori isolates. J Med Microbiol 2004; 53:403-406. [PMID: 15096549 DOI: 10.1099/jmm.0.05397-0] [Citation(s) in RCA: 11] [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: 12/22/2022] Open
Abstract
MICs of clarithromycin and amoxycillin for 253 isolates of Helicobacter pylori were measured by an air-dried microplate method and compared with the results obtained by the agar plate dilution method. The air-dried microplate method is performed by coating each well of a 96-well microplate with the test antibiotic and air-drying it. There were no marked differences between the air-dried microplate method and agar plate dilution methods in the MIC50 and MIC90 values or MIC ranges of clarithromycin obtained for the 253 isolates of H. pylori. More specifically, the MICs of clarithromycin for 114 (45.1 %) of the 253 isolates were the same by the air-dried microplate method as the agar plate dilution method, and the differences in the MICs of clarithromycin for a further 114 isolates (45.1 %) varied within one twofold dilution. The MICs of amoxycillin by the former method were in close agreement with the MICs obtained by the latter method: MICs of amoxycillin for 199 (78.7 %) of the 253 isolates were the same by both methods, and the differences in the MICs of amoxycillin for 42 isolates (16.6 %) varied within one twofold dilution. These results indicate that the air-dried microplate method is a useful method for determination of MICs, because the results obtained were in close agreement with those obtained by the standard agar plate dilution method. The air-dried microplate method is, therefore, a convenient and reliable method for determining the MICs of clarithromycin and amoxycillin for H. pylori isolates.
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Affiliation(s)
- Intetsu Kobayashi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
| | - Hiroe Muraoka
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
| | - Takeshi Saika
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
| | - Minoru Nishida
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
| | - Toshio Fujioka
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
| | - Masaru Nasu
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan 2,3Department of General Medicine2 and Second Department of Internal Medicine3, Oita University Faculty of Medicine, Oita, Japan
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29
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Oikawa T, Shimatsu T, Inaba Y, Sato H, Aoi H, Muraoka H, Nakamura Y. Dependence of the Magnetic Properties of CoPtCr-SiO2/Ru Perpendicular Recording Media on the Pt, Cr Composition. ACTA ACUST UNITED AC 2004. [DOI: 10.3379/jmsjmag.28.254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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30
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Kobayashi I, Muraoka H, Hasegawa M, Saika T, Nishida M, Kawamura M, Ando R. In vitro anti-Helicobacter pylori activity of BAS-118, a new benzamide derivative. J Antimicrob Chemother 2002; 50:129-32. [PMID: 12096019 DOI: 10.1093/jac/dkf106] [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: 11/13/2022] Open
Abstract
The antibacterial activity of BAS-118, a new benzamide derivative, against Helicobacter pylori and other species of bacteria was investigated, as was the in vitro ability of the compound to induce drug resistance in H. pylori. The MICs of BAS-118 for 155 isolates of H. pylori, including 30 clarithromycin (CAM)-resistant isolates (MIC > or= 1.56 mg/L) and 25 metronidazole (MNDZ)-resistant isolates (MIC >or = 6.25 mg/L), and 29 reference strains of other genera were determined by an agar dilution method. The MIC(50), MIC(90) and MIC range of BAS-118 for 100 randomly selected isolates of H. pylori were <or =0.003, 0.013 and < or =0.003-0.025 mg/L, respectively, with similar values obtained for CAM- and MNDZ-resistant isolates. Furthermore, MICs of BAS-118 for five H. pylori strains increased no more than two-fold after 10 serial passages in the presence of subinhibitory concentrations. BAS-118 exhibited a low antibacterial activity against the 29 non-H. pylori strains, with MICs of >or =8 mg/L. In summary, BAS-118 is a novel anti-H. pylori agent with a potent and selective antibacterial activity, which includes CAM- and MNDZ-resistant isolates. Furthermore, BAS-118 does not appear to induce drug resistance readily in vitro.
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Affiliation(s)
- Intetsu Kobayashi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, 3-30-1 Shimura, Itabashi-ku, Tokyo 174-8555, Japan.
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Hasegawa M, Amano A, Muraoka H, Kobayashi I, Kimoto M, Kato M, Fujioka T, Nasu M. [A multicenter study of a new Helicobacter pylori selective medium. Columbia horse blood agar HP]. Kansenshogaku Zasshi 2002; 76:341-6. [PMID: 12073569 DOI: 10.11150/kansenshogakuzasshi1970.76.341] [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: 11/12/2022]
Abstract
We conducted a study for the growth of and selectivity for the desired microorganisms using a newly developed selective culture medium for Helicobacter pylori, Columbia horse blood agar HP (CHBHP), at three different Japanese clinical laboratories, Hokkaido, Kanto and Kyusyu. When standard strains and clinical isolates of H. pylori were examined, the recovery of the organism on the CHBHP media was comparable to that of conventional selective and nonselective media. However, colonies were obviously larger on the CHBHP media. These media yielded the highest H. pylori positive rate for clinical specimens at all the three laboratories. The detection rate of the CHBHP media in H. pylori-positive specimens was higher than that of media commonly used at the three laboratories (98.1% to 100% vs. 88.0% to 96.2%). The CHBHP media also achieved a higher detection rate for specimens from H. pylori-infected animals. CHBHP media have an excellent growth supporting ability and selectivity originating from Columbia agar base and do not require the combined use of non-selective media for the growth and isolation of the organism, resulting in lower cost. Thus, they are useful media for the selective culture and isolation of H. pylori from clinical and animal specimens.
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Affiliation(s)
- Miyuki Hasegawa
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc
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32
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Higuchi S, Usui A, Murasaki M, Matsushita S, Nishioka N, Yoshino A, Matsui T, Muraoka H, Ishizuka Y, Kanba S, Sakurai T. Plasma orexin-A is lower in patients with narcolepsy. Neurosci Lett 2002; 318:61-4. [PMID: 11796186 DOI: 10.1016/s0304-3940(01)02476-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Recently identified hypothalamic peptides called orexins (or hypocretins) have been implicated in the sleep-wake cycle and in sleep disorder narcolepsy. Neuropathological studies have shown that in patients with narcolepsy, global reduction in the expression of orexins occurs due to the loss of orexin neurons in the hypothalamus. Cerebrospinal fluid analysis has confirmed a reduced or undetectable level of orexin-A in most narcolepsy patients. In this study, measurement of plasma orexin showed significantly lower concentrations in patients with narcolepsy than in age- and gender-matched normal controls. These data suggest that low levels of orexin-A in plasma could serve as a biological marker for narcolepsy.
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Affiliation(s)
- S Higuchi
- Institute of Clinical Research, National Alcoholism Center, Kurihama Hospital, 5-3-1 Nobi, Yokosuka, Kanagawa, 239-0841, Japan.
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Katada H, Shimatsu T, Watanabe I, Muraoka H, Nakamura Y. Soft Magnetic Properties and Microstructure of NiFe/FeCo/NiFe Thin Films with Large Saturation Magnetization. ACTA ACUST UNITED AC 2002. [DOI: 10.3379/jmsjmag.26.505] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Naruhashi K, Tamai I, Inoue N, Muraoka H, Sai Y, Suzuki N, Tsuji A. Active intestinal secretion of new quinolone antimicrobials and the partial contribution of P-glycoprotein. J Pharm Pharmacol 2001; 53:699-709. [PMID: 11370709 DOI: 10.1211/0022357011775820] [Citation(s) in RCA: 39] [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] [Indexed: 02/02/2023]
Abstract
Transport of quinolone antimicrobials and the contribution of the secretory transporter P-glycoprotein were studied in-vivo and in-vitro. In rat intestinal tissue (Ussing chambers method) and human Caco-2 cells (Transwell method), grepafloxacin showed secretory-directed transport. In both experimental systems, the secretory-directed transport was decreased by ciclosporin A, an inhibitor of P-glycoprotein, and probenecid, an inhibitor of anion transport systems. This suggested the contribution of P-glycoprotein and anion-sensitive transporter(s). The involvement of P-glycoprotein was investigated by using a P-glycoprotein over-expressing cell line, LLC-GA5-COL150, and P-glycoprotein-gene-deficient mice (mdr1a(-/-)/1b(-/-) mice). LLC-GA5-COL150 cells showed secretory-directed transport of grepafloxacin, while the parent cell line, LLC-PK1, did not. The secretory-directed transport of sparfloxacin and levofloxacin was also detected in LLC-GA5-COL150 cells. In the mdr1a(-/-)/1b(-/-) mice, the intestinal secretory clearance was smaller than that in wild-type mice after intravenous administration of grepafloxacin. Moreover, the absorption from an intestinal loop in mdr1a(-/-)/1b(-/-) mice was larger than that in wild-type mice. Accordingly, it appears that some quinolones are transported by secretory transporters, including P-glycoprotein. The involved transporters function in-vivo not only to transport grepafloxacin from blood to intestine but also to limit its intestinal absorption.
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Affiliation(s)
- K Naruhashi
- Faculty of Pharmaceutical Sciences, Kanazawa University, Japan
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Kobayashi I, Muraoka H, Saika T, Nishida M, Fujioka T, Nasu M. Antimicrobial susceptibilities of Helicobacter pylori isolates under microaerophilic atmospheres established by two different methods. J Clin Microbiol 2001; 39:2646-7. [PMID: 11427585 PMCID: PMC88201 DOI: 10.1128/jcm.39.7.2646-2647.2001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The MICs of clarithromycin, amoxicillin, and metronidazole for 150 Helicobacter pylori isolates were determined using the AnaeroPack system and were compared with those determined using a microaerophilic incubator. The MICs of clarithromycin, amoxicillin, and metronidazole determined under both microaerophilic atmospheres were mostly within one twofold dilution for 146 (97.3%), 150 (100%), and 149 (99.3%) of the isolates, respectively.
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Affiliation(s)
- I Kobayashi
- Chemotherapy Division, Mitsubishi Kagaku Bio-Clinical Laboratories, Inc., Tokyo, Japan.
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Tsunoda A, Terasaki O, Muraoka H, Komatsuzaki A, Kimura Y. Cross-sectional shapes of the internal auditory canal in patients with acoustic neuromas. Acta Otolaryngol 2001; 121:627-31. [PMID: 11583398] [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: 02/21/2023]
Abstract
Cross-sectional images of the internal auditory canal (IAC) were investigated in 23 patients with acoustic neuroma in order to clarify the widening of the IAC. The area of the IAC and the ratio of areas (neuroma side:normal side) were calculated. The shape of the IAC was fitted by an ellipse to obtain the length of the axes and the direction of the long axis. The area of the IAC was 34.2+/-12.2 mm2 in the neuroma side and 18.1+/-4.8 mm2 in the normal side. The neuroma side was larger than the normal side in all patients, and the mean ratio of areas was 1.9. However, the degrees of cochlear and vestibular damage did not correlate with the ratio of areas. The mean ratio of axes of the approximated ellipse was 1.17+/-0.09 in the neuroma side and 1.14+/-0.10 in the normal side; however, no significant difference was seen between the ratio of axes. The directions of the long axes were not always consistent with the positions of the originating nerves of the tumour. Referring to hypothetical models of enlargement of the IAC, our data suggest that the widening of the IAC in the acoustic neuroma was expansive. The data also indicated that symptoms of the acoustic neuroma were caused not only by compression of the nerves but also by other mechanisms, such as vascular insufficiency to the inner ear.
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Affiliation(s)
- A Tsunoda
- Department of Otolaryngology, Tokyo Medical and Dental University, Japan.
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Tsunoda A, Komatsuzaki A, Suzuki Y, Muraoka H. Three-dimensional imaging of the internal auditory canal in patients with acoustic neuroma. Acta Otolaryngol Suppl 2001; 542:6-8. [PMID: 10897391 DOI: 10.1080/000164800454576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Three-dimensional imaging of the internal auditory canal (IAC) was carried out in 21 patients with acoustic neuromas using helical computed tomography. The IAC was widened in 20 patients, but no irregularities of the canal walls were seen. In addition, the shape of the enlarged IAC corresponded to that of the tumor on magnetic resonance imaging. The data suggest that widening of the IAC in acoustic neuroma patients is due to enlargement of the tumor. Other mechanisms, for example, tumor invasion or destruction caused by release of a specific mediator from the tumor, are unlikely to explain these findings; however, further investigation is needed.
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Affiliation(s)
- A Tsunoda
- Department of Otolaryngology, Tokyo Medical and Dental University, Japan.
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Abstract
Fibrous dysplasia (FD) in the paranasal sinuses is uncommon, and its management may be difficult. We report the case of a 25-year-old female with FD exhibiting a cystic appearance in the maxillary sinus. The patient had been complaining of facial swelling for few years. Imagery study showed a cystic lesion and dense bone changes in the maxillary bone. Inferior meatal antrostomy with a nasal endoscope failed to confirm a histological diagnosis. After a 3-year follow-up, the degree of facial swelling was unchanged, and the patient underwent middle meatal antrostomy and was diagnosed with FD.
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Affiliation(s)
- H Muraoka
- Department of Otolaryngology, Kawaguchi-Kogyo General Hospital, 1-18-15 Aoki, Saitama, 332-0031, Kawaguchi City, Japan
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Abstract
Surgical treatment for postoperative maxillary cysts (POMC) can be performed using the peroral method, or the endonasal method which is less invasive. Recently, the percentage of cases in which the endonasal method is employed has increased with the widespread use of endoscopy and advancement in imaging techniques. However, the peroral method is still necessary in some cases. During the 5-year period from July 1994 to June 1999, we operated on 29 patients (31 sides) for POMC. The endonasal method was used for 22 sides, and the peroral method was needed for the remaining 9 sides. Following analysis of the CT scans and MR images, we concluded that it is difficult to employ the endonasal method in the following cases; 1) Cysts located in the lateral or anteroinferior portion of the maxillary sinus 2) Small cysts 3) Cysts with a bony wall.
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Affiliation(s)
- A Ishihara
- Department of Otorhinolaryngology, Kawaguchi-Kogyo General Hospital, Saitama
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Yamanouchi T, Ogata N, Yoshimura T, Inoue T, Ogata E, Kawasaki T, Kashiwabara A, Muraoka H. Transport of 1,5-anhydro-D-glucitol into insulinoma cells by a glucose-sensitive transport system. Biochim Biophys Acta 2000; 1474:291-8. [PMID: 10779680 DOI: 10.1016/s0304-4165(00)00025-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The uptake of 1,5-anhydro-D-glucitol (1,5-AG) occurs by passive mechanisms in cells or tissues that have passive glucose transporters. It is known that serum 1,5-AG concentrations are reduced in patients with diabetes mellitus. To elucidate the metabolism of this substance and its physiological role in pancreatic beta-cells, we assayed 1,5-AG transport in the insulinoma-derived cell lines, RINr and MIN6. Both cell lines showed an insulin-insensitive, concentration-dependent uptake of 1,5-AG with a saturation time of approximately 120 min, and most of the 1,5-AG in the cytoplasm was in the free form. A biphasic saturation curve was obtained using a wide range of 1,5-AG concentrations, suggesting that accumulation was mediated by a high affinity and a low affinity transporter. The high affinity transporter had a K(m) of 10.4 in RINr cells and 13.0 mM in MIN6 cells, and the low affinity transporter had a K(m)100 times, being much higher than the physiological concentrations of 1,5-AG. These results indicate that the 1,5-AG carrier system in insulinoma cells is distinct from that in either the somatic cells or renal tubular cells. These findings also suggest that a unique 1,5-AG transport system is present in pancreatic beta-cells.
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Affiliation(s)
- T Yamanouchi
- Department of Internal Medicine, University of Teikyo, Kaga Itabashi-ku, Tokyo 173, Japan
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41
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Mine T, Endo C, Kushima R, Kushima W, Kobayashi I, Muraoka H, Taki R, Fujita T. The effects of water extracts of CagA positive or negative Helicobacter pylori on proliferation, apoptosis and connexin formation in acetic acid-induced gastric ulcer of rats. Aliment Pharmacol Ther 2000; 14 Suppl 1:199-204. [PMID: 10807425 DOI: 10.1046/j.1365-2036.2000.014s1199.x] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
AIM To investigate the influence of water extracts of CagA-positive or -negative Helicobacter pylori on healing of chronic gastric ulcers and on connexin formation, proliferation and apoptosis, in acetic acid-induced chronic gastric ulcers in rats. METHODS Acetic acid was used to induce chronic gastric ulcers in rats, and a water extract of H. pylori was given by mouth every day. Connexin 32 formation was assessed using Western blotting as previously described. The frequencies of proliferating cell nuclear antigen staining and of TdT-mediated dUTP-biotin nick end labelling were examined. RESULTS In untreated rats, acetic acid-induced gastric ulcers healed after 14 days and the electrophoretic band corresponding to connexin 32 appeared 4 days after ulcer induction. Treatment with a water extract of H. pylori delayed ulcer healing, with the ulcers remaining unhealed even on the 14th day; healing was delayed more when treatment was with an extract of CagA-positive rather than CagA-negative H. pylori. Connexin 32 appeared earlier when treatment was with a CagA-negative rather than a CagA-positive extract, but in both cases later than in the untreated control group. Proliferating cell nuclear antigen labelling on the fourth day was seen in 14.5% +/- 1.6% of mucosal cells of control group, but in 35.9% +/- 1.4% and 36.5% +/- 1.4% of mucosal cells treated with either VacA(+)CagA(-) and VacA(+)CagA(+) H. pylori extract, respectively. Furthermore, extracts of both H. pylori strains, especially VacA(+)Cag(+) H. pylori promoted apoptosis. CONCLUSIONS A water extract of H. pylori increased both proliferation and apoptosis, which are related to exacerbation and healing of ulcer as well as appearance of connexin 32.
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Affiliation(s)
- T Mine
- Department of Internal Medicine, University of Tokyo School of Medicine, Japan.
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43
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Shimatsu T, Komagome H, Muramatsu K, Watanabe I, Muraoka H, Sugita Y, Nakamura Y. Effect of Thermal Agitation on the Magnetic Properties of CoCrTa Perpendicular Recording Media. ACTA ACUST UNITED AC 2000. [DOI: 10.3379/jmsjmag.24.239] [Citation(s) in RCA: 8] [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: 12/01/2022]
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Suzuki J, Muraoka H, Kobayasi I, Fujita T, Mine T. Rare incidence of interspousal transmission of Helicobacter pylori in asymptomatic individuals in Japan. J Clin Microbiol 1999; 37:4174-6. [PMID: 10565957 PMCID: PMC85917 DOI: 10.1128/jcm.37.12.4174-4176.1999] [Citation(s) in RCA: 24] [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: 11/20/2022] Open
Abstract
PCR-restriction fragment length polymorphism electrophoretic patterns of amplified ureB and ureC of Helicobacter pylori were compared between spouses after digestion with restriction endonucleases. Twenty of 21 couples, both members of which were positive for H. pylori, showed ureB and ureC patterns that differed between spouses. We concluded that in Japan, interspousal transmission of H. pylori occurs rarely.
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Affiliation(s)
- J Suzuki
- Department of Internal Medicine IV, University of Tokyo School of Medicine, Tokyo 112-8688, Japan
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Abstract
Three-dimensional images of the incudostapedial joint (I-S joint) were reconstructed using helical computed tomography (CT). The images of the joint were most often reconstructed when threshold values were selected at -500 to -700 Hounsfield Units. These shapes were changed by choosing various threshold values. Histological examinations of the cadaver specimen indicate that these changes are due to structure of the I-S joints. We conclude that these 3-D images may be useful in assessing pathology of the I-S joint.
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Affiliation(s)
- M Yamada
- Department of Otolaryngology, Tokyo Medical and Dental University, Japan
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46
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Ishigooka J, Suzuki M, Isawa S, Muraoka H, Murasaki M, Okawa M. Epidemiological study on sleep habits and insomnia of new outpatients visiting general hospitals in Japan. Psychiatry Clin Neurosci 1999; 53:515-22. [PMID: 10498235 DOI: 10.1046/j.1440-1819.1999.00578.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [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: 11/20/2022]
Abstract
A large scale epidemiological survey of sleep habits, specifically for insomnia, was conducted using 6277 new outpatients from 11 general hospitals in Japan. They were requested to answer a questionnaire newly designed for this study, which consisted of 34 questions concerning sociodemographic characteristics, current medical conditions, sleep habits, current or past sleep complaints, symptoms of parasomnia, use of hypnotics/anxiolytics and other aspects of daily life. Insomnia was the focus of analysis using chi2 statistics and, additionally, logistic regression to explore the predictors of insomnia. Bedtime was 23:30 and wake-up time was 6:35 on average, with a mean sleep time of 6.77 h on weekdays. The number of subjects with current sleep complaints was 1276, of which 735 (11.7% of the total sample) had insomnia lasting for 1 month or more. Only 37.6% of those were taking hypnotics and/or anxiolytics. Old age, female sex, neurology, psychiatry, early bedtime, late wake-up time, living alone and dissatisfaction with the bedroom environment for sleep were found to be associated with long-term insomnia. This study helps to provide a framework for further studies using the general population.
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Affiliation(s)
- J Ishigooka
- Department of Psychiatry, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
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Abstract
Glutathione reductase (GR) activity and flavin concentration were studied in systemic tissues (brain, heart, lung, liver, spleen, stomach, pancreas, muscle, kidney, testis) and blood components (erythrocytes and plasma) from male guinea-pigs. GR activity and the flavin concentration were high in kidney and liver, and low in muscle. GR activity in erythrocytes was found in a range of tissues, but flavin concentration in erythrocytes was lower than in any tissues. GR was saturated with flavin adenine dinucleotide (FAD) in almost all tissues, but not in muscle or erythrocytes.
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Affiliation(s)
- M Suzuki
- Japan Lypophilization Laboratory, Tokyo, Japan
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48
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Muraoka H, Aoyama T, Saika T, Sato Y, Kobayashi I, Akita H, Iwata S, Sato Y, Sunakawa K. [Effect of antibiotics and antibody on phagocytic bactericidal activity of polymorphonuclear neutrophils of Bordetella pertussis]. Kansenshogaku Zasshi 1999; 73:239-43. [PMID: 10222670 DOI: 10.11150/kansenshogakuzasshi1970.73.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The phagocytic bactericidal activity of the polymononucler neutrophils (PMNs) that were collected from healthy volunteer with and without antibody against Bordetella pertussis was investigated. Furthermore, these activity against B. pertussis under observing penicillins or macrolides antibiotics was investigated. Although no efficacy to B. pertussis strain by the PMNs in serum without antibody, but the viable cells of B. pertussis decreased to 1/1,000 1 hr after incubation and was not detected after 4 hrs. In particular, the viable cells of B. pertussis by the PMNs in serum with antibody was markedly reduced when azithromycin was present. These results suggests that the synergistic action of macrolide antibiotics and antibody-mediated phagocytic bactericidal activity on B. pertussis may have clinical relevance.
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Affiliation(s)
- H Muraoka
- Chemotherapy Division, Mitsubishi-Kagaku Bio-Clinical Laboratories
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Muraoka H, Miura K, Sugita Y, Nakamura Y. Characterization of Perpendicular Magnetic Recording and Performance Estimation. ACTA ACUST UNITED AC 1999. [DOI: 10.3379/jmsjmag.23.s2_35] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Muraoka H, Tokeshi S, Abe H, Miyahara Y, Uchimura Y, Noguchi S, Sata M, Tanikawa K. Two cases of adult varicella accompanied by hepatic dysfunction. Kansenshogaku Zasshi 1998; 72:418-23. [PMID: 9621571 DOI: 10.11150/kansenshogakuzasshi1970.72.418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Varicella is a typical acute exanthematous viral infection caused by varicella-zoster virus (VZV). In recently years, as far as hepatic dysfunction caused by viruses other than the hepatitis virus is concerned, there have been a few reports on hepatic dysfunction accompanying varicella following organ transplantation of Europe and America and another report on an immunocompromized adult following treatment for Systemic lupus erythematosis (SLE) in Japan. Nonetheless, we searched the MEDLINE and J MEDICINE listing the publications between 1986 and 1996 and found one report on healthy adults with varicella accompanied by hepatic dysfunction in Europe and America and two reports in Japan. Only Noguchi et al. dealt with the findings of liver biopsy. We examined two healthy adults with varicella and mild-to-moderate hepatic dysfunction, and referred to the results of their liver biopsies. The present paper discusses this issue, citing some references.
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Affiliation(s)
- H Muraoka
- Department of Medicine, Kumamoto Central Hospital
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