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Abstract

The spread of multidrug-resistant isolates constitutes a serious clinical challenge. Bacterial efflux machinery is a crucial mechanism of resistance among . Efflux inhibitors such as phenylalanine arginyl β-naphthylamide (PAβN) promote the bacterial susceptibility to antimicrobial agents. The pathogenesis of is coordinated via quorum sensing (QS). This study aims to find out the impact of efflux pump inhibitor, PAβN, on QS and virulence attributes in clinical isolates of . isolates were purified from urine and wound samples, and the antimicrobial susceptibility was carried out by disc diffusion method. The multidrug-resistant and the virulent isolates U16, U21, W19 and W23 were selected. PAβN enhanced their susceptibility to most antimicrobial agents. PAβN reduced QS signalling molecules -3-oxo-dodecanoyl--homoserine lactone and -butyryl--homoserine lactone without affecting bacterial viability. Moreover, PAβN eliminated their virulence factors such as elastase, protease, pyocyanin and bacterial motility. At the transcription level, PAβN significantly (<0.01) diminished the relative expression of QS cascade (, , , , and ) and QS regulated-type II secretory genes (elastase) and (exotoxin A) compared to the control untreated isolates U16 and U21. In addition, PAβN eliminated the relative expression of (exopolysaccharides) in U16 and U21 isolates. Hence, -tested isolates became hypo-virulent upon using PAβN. PAβN significantly blocked the QS circuit and inhibited the virulence factors expressed by clinical isolates of . PAβN could be a prime substrate for development of QS inhibitors and prevention of pathogenicity.

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2016-10-18
2021-10-17
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