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首页> 外文期刊>Antimicrobial agents and chemotherapy. >MexAB-OprM- and MexXY-Overproducing Mutants Are Very Prevalent among Clinical Strains of Pseudomonas aeruginosa with Reduced Susceptibility to Ticarcillin
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MexAB-OprM- and MexXY-Overproducing Mutants Are Very Prevalent among Clinical Strains of Pseudomonas aeruginosa with Reduced Susceptibility to Ticarcillin

机译:MexAB-OprM和MexXY高产突变体在铜绿假单胞菌临床菌株中非常普遍,对替卡西林的敏感性降低

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摘要

Of the nine efflux systems of the RND (resistance nodula-tion cell division) family characterized so far in Pseudomonas aeruginosa, four confer significant resistance to antibiotics when overproduced. These systems, namely, MexAB-OprM (ABM), MexCD-OprJ (CDJ), MexEF-OprN (EFN), and MexXY (XY), are individually able to pump out multiple antipseudo-monal compounds, including p-lactams (ABM, CDJ, XY), fluoroquinolones (ABM, CDJ, EFN, XY), and aminoglyco-sides (XY) (6). Multiresistant mutants overproducing these pumps have sporadically been described, but their prevalence in the clinical setting remains poorly known. This study was first designed to determine the proportion of ABM gain-of-efflux mutants in a collection of clinical P. aeruginosa isolates displaying reduced susceptibilities to ti-carcillin (TIC). As resistance to TIC is frequently associated with resistance to aminoglycosides and to fluoroquinolones, we also assessed the expression of CDJ, EFN, and XY efflux systems in the isolates.
机译:迄今为止,在铜绿假单胞菌中表征的RND(耐药结节性细胞分裂)家族的9个外排系统中,当过量生产时,其中4个对抗生素具有明显的耐药性。这些系统,即MexAB-OprM(ABM),MexCD-OprJ(CDJ),MexEF-OprN(EFN)和MexXY(XY),能够分别泵出多种对伪化合物,包括对内酰胺(ABM) ,CDJ,XY),氟喹诺酮类(ABM,CDJ,EFN,XY)和氨基糖苷(XY)(6)。零星地描述了过量产生这些泵的多抗性突变体,但其在临床环境中的流行仍知之甚少。这项研究的初衷是确定在临床上表现出对ti-carcillin(TIC)敏感性降低的铜绿假单胞菌分离株中,ABM外排获得突变的比例。由于对TIC的抗性通常与对氨基糖苷和对氟喹诺酮类的抗性相关,因此我们还评估了分离株中CDJ,EFN和XY外排系统的表达。

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