Broad spectrum of β-lactamase coverage and potent antimicrobial activity of xeruborbactam in combination with meropenem against carbapenemase-producing Enterobacterales, including strains resistant to new β-lactam/β-lactamase inhibitor combinations
Xeruborbactam is a broad-spectrum boronate-type β-lactamase inhibitor. We aimed to evaluate its activity in combination with meropenem and compare it with other β-lactam/β-lactamase inhibitor combinations against Enterobacterales. The following isolates were screened: (i) an isogenic collection of 9...
| Autores: | , , , , , , , , , , , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/402363 |
| Acesso em linha: | http://hdl.handle.net/10261/402363 https://api.elsevier.com/content/abstract/scopus_id/105014961163 |
| Access Level: | acceso abierto |
| Palavra-chave: | Enterobacterales Beta-lactam Beta-lactamase Beta-lactamase inhibitor Carbapenemase Carbapenemase-producing Enterobacterales Xeruborbactam |
| Resumo: | Xeruborbactam is a broad-spectrum boronate-type β-lactamase inhibitor. We aimed to evaluate its activity in combination with meropenem and compare it with other β-lactam/β-lactamase inhibitor combinations against Enterobacterales. The following isolates were screened: (i) an isogenic collection of 94 Escherichia coli isolates producing β-lactamases under wild-type and low-permeability conditions, (ii) 300 genetically diverse clinical Enterobacterales isolates producing the three main carbapenemase types (KPC-like, OXA-48-like, and metallo-β-lactamases), and (iii) two collections of isolates producing mechanisms of resistance to β-lactam/β-lactamase inhibitor combinations, such as KPC variants or PBP3 insertions combined with metallo-β-lactamases (MBLs). The MICs of meropenem, meropenem/xeruborbactam, meropenem/vaborbactam, imipenem, imipenem/relebactam, cefepime, cefepime/taniborbactam, ceftazidime, ceftazidime/avibactam, aztreonam, and aztreonam/avibactam were determined by reference broth microdilution and interpreted following the European Committee on Antimicrobial Susceptibility Testing guidelines, using the breakpoint of the β-lactam alone for not yet approved combinations. Resistance mechanisms of all clinical isolates were analyzed by whole genome sequencing. Meropenem/xeruborbactam had the broadest spectrum against the isogenic collection, although higher MICs were noted for transformants producing IMP-23, SPM-1, and NDM enzymes (these latter only when produced under low-permeability conditions). Meropenem/xeruborbactam displayed the most potent activity against the collection of 300 clinical strains (MIC50/90 ≤0.06/≤0.06 mg/L). Xeruborbactam restored meropenem activity against the strains carrying resistance mechanisms to β-lactam/β-lactamase inhibitor combinations, including strains producing KPC variants or MBLs in combination with additional chromosomal alterations (MIC range: ≤0.06–0.25 and ≤0.06–4 mg/L, respectively). Our findings highlight the potential of xeruborbactam in combination with meropenem as a promising treatment against carbapenemase-producing Enterobacterales, including strains with emerging resistance to other β-lactam/β-lactamase inhibitor combinations. |
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