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• W3100290875 abstract "Abstract The antimicrobial triclosan is used in a wide range of consumer products ranging from toothpaste, cleansers, socks, and baby toys. A bacteriostatic inhibitor of fatty acid synthesis, triclosan is extremely stable and accumulates in the environment. Approximately 75% of adults in the US have detectable levels of the compound in their urine, with a sizeable fraction of individuals (>10%) having urine concentrations equal to or greater than the minimal inhibitory concentration for Escherichia coli and methicillin-resistant Staphylococcus aureus (MRSA). Previous work has identified connections between defects in fatty acid synthesis and accumulation of the alarmone guanosine tetraphosphate (ppGpp), which has been repeatedly associated with antibiotic tolerance and persistence. Based on these data, we hypothesized that triclosan exposure may inadvertently drive bacteria into a state in which they are able to tolerate normally lethal concentrations of antibiotics. Here we report that clinically relevant concentrations of triclosan increased E. coli and MRSA tolerance to bactericidal antibiotics as much as 10,000 fold in vitro and reduced antibiotic efficacy up to 100-fold in a mouse urinary tract infection model. Genetic analysis indicated that triclosan-mediated antibiotic tolerance requires ppGpp synthesis, but is independent of growth. These data highlight an unexpected and certainly unintended consequence of adding high concentrations of antimicrobials in consumer products, supporting an urgent need to reevaluate the costs and benefits of the prophylactic use of triclosan and other bacteriostatic compounds. Importance Added as a prophylactic to a wide range of consumer products, the fatty acid synthesis inhibitor triclosan accumulates to high levels in humans and the environment. Based on links between defects in fatty acid synthesis and accumulation of the alarmone ppGpp, we hypothesized that triclosan would render cells tolerant to bactericidal compounds due to ppGpp-mediated inhibition of biosynthetic capacity. Our data indicate that clinically relevant concentrations of triclosan induces higher tolerance of E. coli and methicillin resistant S. aureus (MRSA) to a panel of bactericidal antibiotics up to 10,000-fold. In a urinary tract infection model, mice exposed to triclosan exhibited bacterial loads ~100-fold higher in the bladder than control animals following ciprofloxacin challenge. These findings highlight an unexpected consequence of antimicrobials in consumer products and support an urgent need to reevaluate the costs and benefits of the prophylactic use of triclosan and other bacteriostatic compounds." @default.
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• W3100290875 date "2016-12-01" @default.
• W3100290875 modified "2023-09-27" @default.
• W3100290875 title "The commercial antimicrobial triclosan induces high levels of antibiotic tolerance in vitro and reduces antibiotic efficacy up to 100-fold in vivo" @default.
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• W3100290875 doi "https://doi.org/10.1101/090829" @default.
• W3100290875 hasPublicationYear "2016" @default.
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