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Here, we examined the effects of telithromycin, clarithromycin and azithromycin on methicillin-resistant Staphylococcus aureus (MRSA) coagulase in vitro. We also examined the effects of these antibiotics on bacterial survival in a murine model of pulmonary infection, in which the number of bacteria in the lung correlates with the coagulase titre. METHODS: The coagulase titre in MRSA strain NUMR101, a clinical isolate, was measured after a 16 h treatment with telithromycin, clarithromycin or azithromycin at the MIC (512 mg/L) and 1/2, 1/4, 1/8 and 1/16 of the MIC. In addition, we examined the effect of these drugs in a murine model of pulmonary infection induced by the intravenous injection of S. aureus enmeshed in agar beads. 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Subinhibitory concentrations of telithromycin, clarithromycin and azithromycin reduce methicillin-resistant Staphylococcus aureus coagulase in vitro and in vivo.
http://hdl.handle.net/10069/23132
http://hdl.handle.net/10069/23132c791326c-1a0c-497e-8041-1a7470ea3a6a
名前 / ファイル | ライセンス | アクション |
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JAC61_647.pdf (214.6 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2010-04-30 | |||||
タイトル | ||||||
タイトル | Subinhibitory concentrations of telithromycin, clarithromycin and azithromycin reduce methicillin-resistant Staphylococcus aureus coagulase in vitro and in vivo. | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | MRSA | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Pathogenesis | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Resistant bacteria | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Yanagihara, Katsunori
× Yanagihara, Katsunori× Morinaga, Yoshitomo× Nakamura, Shigeki× Seki, Masafumi× Izumikawa, Koichi× Kakeya, Hiroshi× Yamamoto, Yoshihiro× Yamada, Yasuaki× Kamihira, Shimeru× Kohno, Shigeru |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | BACKGROUND: Subinhibitory levels of clarithromycin and azithromycin have been shown to reduce the activity of bacterial virulence factors, but few studies have examined the effects of subinhibitory levels of telithromycin. Here, we examined the effects of telithromycin, clarithromycin and azithromycin on methicillin-resistant Staphylococcus aureus (MRSA) coagulase in vitro. We also examined the effects of these antibiotics on bacterial survival in a murine model of pulmonary infection, in which the number of bacteria in the lung correlates with the coagulase titre. METHODS: The coagulase titre in MRSA strain NUMR101, a clinical isolate, was measured after a 16 h treatment with telithromycin, clarithromycin or azithromycin at the MIC (512 mg/L) and 1/2, 1/4, 1/8 and 1/16 of the MIC. In addition, we examined the effect of these drugs in a murine model of pulmonary infection induced by the intravenous injection of S. aureus enmeshed in agar beads. Treatment was started 1 day before infection and mice were treated once a day for 7 days by oral administration of 10 or 100 mg/kg telithromycin, clarithromycin or azithromycin, and the number of viable bacteria in the lungs was counted 24 h after the injection of the bacteria. RESULTS: The coagulase titres in mice treated with 1/8 of the MIC of telithromycin, clarithromycin and azithromycin and in the control were 8, 4, 8 and 32, respectively. In the mouse model of infection, the log cfu/lung (mean +/- SEM; n = 5 or 6) were 6.62 +/- 0.81, 4.79 +/- 0.41, 6.15 +/- 0.38 and 8.41 +/- 0.30 for mice treated with 100 mg/kg/day of telithromycin, clarithromycin and azithromycin and for controls, respectively (P < 0.05 for all groups versus control). CONCLUSIONS: Subinhibitory concentrations of telithromycin inhibit MRSA coagulase in vitro. In addition, the in vivo results indicate that pre-treatment with telithromycin, clarithromycin or azithromycin can reduce the bacterial load in a murine model of pulmonary infection. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Antimicrobial Chemotherapy following peer review. The definitive publisher-authenticated version The Journal of antimicrobial chemotherapy, 61(3), pp.647-650; 2008 is available online at: http://jac.oxfordjournals.org/cgi/content/abstract/61/3/647. | |||||
書誌情報 |
The Journal of antimicrobial chemotherapy 巻 61, 号 3, p. 647-650, 発行日 2008-03 |
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出版者 | ||||||
出版者 | Oxford University Press | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 03057453 | |||||
EISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 14602091 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00693321 | |||||
PubMed番号 | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | PMID | |||||
関連識別子 | 18174195 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1093/jac/dkm507 | |||||
権利 | ||||||
権利情報 | © The Author 2008. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | The Journal of antimicrobial chemotherapy, 61(3), pp.647-650; 2008 |