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A New Quorum-Sensing Inhibitor Attenuates Virulence and Decreases Antibiotic Resistance in Pseudomonas aeruginosa
Yu-Xiang Yang , Zhen-Hua Xu , Yu-Qian Zhang , Jing Tian , Li-Xing Weng , Lian-Hui Wang
J. Microbiol. 2012;50(6):987-993.   Published online December 30, 2012
DOI: https://doi.org/10.1007/s12275-012-2149-7
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AbstractAbstract
Quorum sensing (QS) has been a novel target for the treatment of infectious diseases. Here structural analogs of Pseudomonas aeruginosa autoinducer N-acyl homoserine lactone (AHL) were investigated for QS inhibitor (QSI) activity and a novel QSI was discovered, N-decanoyl-L-homoserine benzyl ester (C2). Virulence assays showed that C2 downregulated total protease and elastase activities, as well as the production of rhamnolipid, that are controlled by QS in P. aeruginosa wild-type strain PAO1 without affecting growth. C2 was also shown to inhibit swarming motility of PAO1. Using a microdilution checkerboard method, we identified synergistic interactions between C2 and several antibiotics, tobramycin, gentamycin, cefepime, and meropenem. Data from real-time RT-PCR suggested that C2 inhibited the expression of lasR (29.67%), lasI (21.57%), rhlR (28.20%), and rhlI (29.03%).
A Simple Colorimetric Method for Testing Antimicrobial Susceptibility of Biofilmed Bacteria
Shukho Kim , Mi Jin Kim , Hee Young Kang , Sung Yong Seol , Dong Taek Cho , Jungmin Kim
J. Microbiol. 2010;48(5):709-711.   Published online November 3, 2010
DOI: https://doi.org/10.1007/s12275-010-0299-z
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  • 21 Crossref
AbstractAbstract
This study introduces a simple colorimetric method which can measure the antimicrobial susceptibility of bacteria in biofilms using trimethyl tetrazolium chloride (TTC) as an indicator of viable bacteria. The new method was utilized for the evaluation of antibiotic susceptibility of Escherichia coli, Klebsiella pneumoniae, and Staphylococcus aureus biofilms.

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