Abstract | OBJECTIVES:
Tomopenem (CS-023) is a novel parenteral carbapenem with broad-spectrum activity against Gram-positive and -negative bacteria, as well as potent activity against drug-resistant pathogens, including penicillin-resistant Streptococcus pneumoniae, methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa. We compared the in vivo activity of tomopenem and that of meropenem in a chronic lower respiratory infection mouse model of P. aeruginosa. METHODS: Mice with chronic airway infection by P. aeruginosa were treated with saline (as the control, twice daily), tomopenem (100 mg/kg, twice daily) or meropenem (100 mg/kg, twice daily) for 7 days. After treatment, the number of viable bacteria in lungs and histopathological findings were analysed. The pharmacokinetics of tomopenem and meropenem were also analysed after initial treatment. RESULTS: The number of viable bacteria in lungs treated with saline, tomopenem or meropenem was 4.21 +/- 1.28, 2.91 +/- 0.87 and 3.01 +/- 1.00 log(10) cfu/lung (mean +/- SEM), respectively (P < 0.05, control versus tomopenem- or meropenem-treated groups). In the histopathological examination of lung specimens, the control group had the features of chronic bronchial infection; however, tomopenem- and meropenem-treated groups had fewer inflammatory cells compared with the control group. The pharmacokinetic parameter of % time above MIC for tomopenem and meropenem was 16% and 17% in sera and 15% and 18% in lungs, respectively. CONCLUSIONS:
Tomopenem significantly reduced the number of viable bacteria in a murine model of chronic airway infection by P. aeruginosa, compared with the control. Considering the longer half-life of tomopenem in humans compared with most other carbapenems, tomopenem treatment of chronic airway infection with P. aeruginosa is expected to be efficacious.
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Authors | Yoshitomo Morinaga, Katsunori Yanagihara, Shigeki Nakamura, Kazuko Yamamoto, Koichi Izumikawa, Masafumi Seki, Hiroshi Kakeya, Yoshihiro Yamamoto, Yasuaki Yamada, Shigeru Kohno, Shimeru Kamihira |
Journal | The Journal of antimicrobial chemotherapy
(J Antimicrob Chemother)
Vol. 62
Issue 6
Pg. 1326-31
(Dec 2008)
ISSN: 1460-2091 [Electronic] England |
PMID | 18835805
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Anti-Bacterial Agents
- Carbapenems
- Thienamycins
- tomopenem
- Meropenem
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Topics |
- Animals
- Anti-Bacterial Agents
(administration & dosage, pharmacokinetics, therapeutic use)
- Carbapenems
(administration & dosage, pharmacokinetics, therapeutic use)
- Colony Count, Microbial
- Humans
- Lung
(chemistry, microbiology, pathology)
- Male
- Meropenem
- Mice
- Pseudomonas Infections
(drug therapy)
- Pseudomonas aeruginosa
(drug effects)
- Respiratory Tract Infections
(drug therapy, microbiology)
- Serum
(chemistry)
- Thienamycins
(administration & dosage, pharmacokinetics, therapeutic use)
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