Abstract | BACKGROUND:
Carbapenem-resistant Enterobacterales (CRE) and carbapenemase-producing Enterobacterales (CPE) are difficult to treat and are a serious public health threat. Nacubactam (NAC) is a novel non-β- lactam diazabicyclooctane β-lactamase inhibitor with in vitro activity against some Enterobacterales expressing classes of β-lactamases. METHODS: The antimicrobial efficacy of meropenem (MEM), cefepime ( FEP), and aztreonam (ATM), each in combination with NAC, were assessed in vitro and in vivo against Klebsiella pneumoniae and Escherichia coli. Ten isolates, including CRE and/or CPE with β-lactamase genes, were used in this study. The relationship between phenotype and in vivo efficacy was assessed in a murine neutropenic thigh- infection model. Efficacy was determined by the change in bacterial quantity. RESULTS: The results of the in vitro study showed the minimum inhibitory concentrations of the combination of NAC with either MEM, FEP, or ATM in a 1:1 ratio were 2 to >128-fold lower than those of MEM, FEP, or ATM alone against CRE+ isolates. In addition, combinations of β- lactams and NAC administered in the murine thigh- infection model showed greater efficacy against CRE+/CPE+, CRE+/CPE-, and CRE-/CPE+ isolates harboring various β-lactamase genes ( IMP-1, IMP-6, KPC, DHA-1, or OXA-48) compared with MEM, FEP, ATM, and NAC alone. CONCLUSION: MEM, FEP, or ATM in combination with NAC showed potent in vivo antimicrobial activity in a murine thigh- infection model caused by K. pneumoniae and E. coli, including CRE and/or CPE isolates. These findings indicate that these combinations of β- lactams and NAC are potential candidates for the treatment of CRE and/or CPE infections.
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Authors | Mao Hagihara, Hideo Kato, Toshie Sugano, Hayato Okade, Nobuo Sato, Yuichi Shibata, Daisuke Sakanashi, Nobuhiro Asai, Yusuke Koizumi, Hiroyuki Suematsu, Yuka Yamagishi, Hiroshige Mikamo |
Journal | International journal of antimicrobial agents
(Int J Antimicrob Agents)
Vol. 57
Issue 5
Pg. 106330
(May 2021)
ISSN: 1872-7913 [Electronic] Netherlands |
PMID | 33789129
(Publication Type: Journal Article)
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Copyright | Copyright © 2021 Elsevier Ltd. All rights reserved. |
Chemical References |
- Anti-Bacterial Agents
- Azabicyclo Compounds
- Bacterial Proteins
- Lactams
- Cefepime
- nacubactam
- beta-Lactamases
- carbapenemase
- Meropenem
- Aztreonam
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Topics |
- Animals
- Anti-Bacterial Agents
(pharmacology)
- Azabicyclo Compounds
(pharmacology)
- Aztreonam
(pharmacology)
- Bacterial Proteins
(genetics, metabolism)
- Carbapenem-Resistant Enterobacteriaceae
(drug effects)
- Cefepime
(pharmacology)
- Dose-Response Relationship, Drug
- Drug Resistance, Bacterial
- Drug Therapy, Combination
- Enterobacteriaceae Infections
(drug therapy, microbiology)
- Escherichia coli
(drug effects)
- Humans
- Klebsiella pneumoniae
(drug effects)
- Lactams
(pharmacology)
- Meropenem
(pharmacology)
- Mice
- Mice, Inbred ICR
- Microbial Sensitivity Tests
- Models, Animal
- Specific Pathogen-Free Organisms
- beta-Lactamases
(genetics, metabolism)
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