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• W2897214732 abstract "Abstract Pseudomonas aeruginosa is an opportunistic pathogen that often infects open wounds or patients with cystic fibrosis. Once established, P. aeruginosa infections are notoriously difficult to eradicate. This difficulty is in part due to the ability of P. aeruginosa to tolerate antibiotic treatment at the individual-cell level or through collective behaviors. Here we describe a new mechanism by which P. aeruginosa tolerates antibiotic treatment by modulating its global cellular metabolism. In particular, treatment of P. aeruginosa with sublethal concentrations of antibiotics covering all major classes promoted accumulation of the redox-sensitive phenazine - pyocyanin (PYO). PYO in turn conferred general tolerance against diverse antibiotics for both P. aeruginosa and other Gram-negative and Gram-positive bacteria. We show that PYO promotes energy generation to enhance the activity of efflux pumps, leading to enhanced antibiotic tolerance. This property is shared by other redox-active phenazines produced by P. aeruginosa . Our discovery sheds new insights into the physiological functions of phenazines and has implications for designing effective antibiotic treatment protocols. Author Summary Antibiotic tolerance can facilitate the evolution of resistance, and here we describe a previously unknown mechanism of collective antibiotic tolerance in Pseudomonas aeruginosa . In particular, P. aeruginosa treated with sublethal concentrations of antibiotics covering all major classes promotes accumulation of pyocyanin (PYO), an important virulence factor. In turn, PYO confers general tolerance against diverse antibiotics for both P. aeruginosa and other bacteria. Our discovery is a perfect example of what Nietzsche once said: That which does not kill me makes me stronger ." @default.
• W2897214732 created "2018-10-26" @default.
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• W2897214732 date "2018-10-25" @default.
• W2897214732 modified "2023-10-16" @default.
• W2897214732 title "Universal antibiotic tolerance arising from antibiotic-triggered accumulation of redox metabolites" @default.
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• W2897214732 doi "https://doi.org/10.1101/453290" @default.
• W2897214732 hasPublicationYear "2018" @default.
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