Resistance to the quorum-quenching compounds brominated furanone C-30 and 5-fluorouracil in Pseudomonas aeruginosa clinical isolates

The quorum-quenching compounds brominated furanone C-30 and 5-fluorouracil inhibit the pathogenicity of the Pseudomonas aeruginosa laboratory strains PA01 and PA14; however, there is no report studying the effectiveness of these compounds for clinical isolates. Therefore, the effect of both quorum quenchers on the production of pyocyanin, elastase and alkaline protease of eight clinical strains from children was evaluated. Although both compounds were in general effective for the attenuation of these factors, three strains resistant to C-30 were found. For 5-fluorouracil, PA01 and some clinical isolates showed resistance for at least one phenotype. In this work the effect of 2 quorum sensing inhibitors on different clinical isolates of Pseudomonas aeruginosa was examined and some of the isolates were found to be resistant the inhibitors. The results are potentially useful for the clinic and for treatment of P. aeruginosa infections.