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Effect of β-lactamase inhibitors on in vitro activity of β-lactam antibiotics against Burkholderia cepacia complex species

机译:β-内酰胺酶抑制剂对β-内酰胺类抗生素对洋葱伯克霍尔德菌种体外活性的影响

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摘要

Background: Bacteria belonging to the Burkholderia cepacia complex (Bcc) are an important cause of chronic respiratory tract infections in cystic fibrosis patients. Intrinsic resistance to a wide range of antimicrobial agents, including a variety of beta-lactam antibiotics, is frequently observed in Bcc strains. Resistance to beta-lactams is most commonly mediated by efflux pumps, alterations in penicillin-binding proteins or the expression of beta-lactamases. beta-lactamase inhibitors are able to restore the in vitro activity of beta-lactam molecules against a variety of Gram-negative species, but the effect of these inhibitors on the activity of beta-lactam treatment against Bcc species is still poorly investigated. Methods: In the present study, the susceptibility of a panel of Bcc strains was determined towards the beta-lactam antibiotics ceftazidime, meropenem, amoxicillin, cefoxitin, cefepime and aztreonam; alone or in combination with a beta-lactamase inhibitor (clavulanic acid, sulbactam, tazobactam and avibactam). Consequently, beta-lactamase activity was determined for active beta-lactam/beta-lactamase inhibitor combinations. Results: Clavulanic acid had no effect on minimum inhibitory concentrations, but addition of sulbactam, tazobactam or avibactam to ceftazidime, amoxicillin, cefoxitin, cefepime or aztreonam leads to increased susceptibility (at least 4-fold MIC-decrease) in some Bcc strains. The effect of beta-lactamase inhibitors on beta-lactamase activity is both strain-and/or antibiotic-dependent, and other mechanisms of beta-lactam resistance (besides production of beta-lactamases) appear to be important. Conclusions: Considerable differences in susceptibility of Bcc strains to beta-lactam antibiotics were observed. Results obtained in the present study suggest that resistance of Bcc strains against beta-lactam antibiotics is mediated by both beta-lactamases and non-beta-lactamase-mediated resistance mechanisms.
机译:背景:洋葱伯克霍尔德菌(Bocholderia cepacia)复合物(Bcc)的细菌是囊性纤维化患者慢性呼吸道感染的重要原因。在Bcc菌株中经常观察到对多种抗菌剂(包括多种β-内酰胺类抗生素)的内在抗性。对β-内酰胺类药物的耐药性最常见的是通过外排泵,青霉素结合蛋白的改变或β-内酰胺酶的表达介导的。 β-内酰胺酶抑制剂能够恢复β-内酰胺分子对多种革兰氏阴性菌的体外活性,但这些抑制剂对β-内酰胺对Bcc物种的活性影响的研究仍很少。方法:在本研究中,确定了一组Bcc菌株对β-内酰胺类抗生素头孢他啶,美罗培南,阿莫西林,头孢西丁,头孢吡肟和氨曲南的敏感性。单独使用或与β-内酰胺酶抑制剂(棒酸,舒巴坦,他唑巴坦和阿维巴坦)联合使用。因此,确定了活性β-内酰胺/β-内酰胺酶抑制剂组合的β-内酰胺酶活性。结果:棒酸对最低抑菌浓度没有影响,但是在某些Bcc菌株中向头孢他啶,阿莫西林,头孢西丁,头孢吡肟或氨曲南添加舒巴坦,他唑巴坦或阿维巴坦会导致药敏性增加(MIC降低至少4倍)。 β-内酰胺酶抑制剂对β-内酰胺酶活性的影响是菌株和/或抗生素依赖性的,并且β-内酰胺抗性的其他机制(除了β-内酰胺酶的产生)似乎很重要。结论:观察到Bcc菌株对β-内酰胺类抗生素的敏感性差异很大。在本研究中获得的结果表明,Bcc菌株对β-内酰胺类抗生素的耐药性是由β-内酰胺酶和非β-内酰胺酶介导的耐药机制介导的。

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