Antibacterial efficacy of R-type pyocins against Pseudomonas aeruginosa on biofilms and in a murine model of acute lung infection

The Journal of Antimicrobial Chemotherapy
Mar RederoAna I Prieto

Abstract

The appearance of MDR strains and the development of biofilms make Pseudomonas aeruginosa infections a therapeutic challenge. To overcome this scenario, bacteriocins have been proposed as a potential adjuvant or alternative to antibiotic treatment. To study the activity of R-pyocins on biofilms and in a murine model of pneumonia using a high-risk clone of P. aeruginosa. The activity of R-pyocins on P. aeruginosa biofilms was tested on bacteria attached to a silicone surface, before and after biofilm formation. The effectiveness of R1-pyocin was studied in a murine model of pneumonia using ST175, a high-risk clone of P. aeruginosa. R-pyocins attacked adherent bacteria, preventing biofilm formation, and penetrated into the biofilm, killing P. aeruginosa within it, resulting in a dramatic reduction in bacterial load. R1-pyocin was active in a murine model of P. aeruginosa lung infection, administered before infection as a preventive treatment, and in acute pneumonia, with efficiency higher than standard colistin treatment. In addition, this work is the first to describe histopathological lung changes after administration of R-pyocins, contributing to the resolution of P. aeruginosa pneumonia in a murine model. This work highlights...Continue Reading

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