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• W2894617794 abstract "Abstract Cell-cell interactions play an important role in bacterial antibiotic resistance. Here, we asked whether neighbor proximity is sufficient to generate single-cell variation in antibiotic resistance due to local differences in antibiotic concentrations. To test this, we focused on multidrug efflux pumps because recent studies have revealed that expression of pumps is heterogeneous across populations. Efflux pumps can export antibiotics, leading to elevated resistance relative to cells with low or no pump expression. In this study, we co-cultured cells with and without AcrAB-TolC pump expression and used single-cell time-lapse microscopy to quantify growth rate as a function of a cell’s neighbors. In inhibitory concentrations of chloramphenicol, we found that cells lacking functional efflux pumps (Δ acrB ) grow more slowly when they are surrounded by cells with AcrAB-TolC pumps than when surrounded by Δ acrB cells. To help explain our experimental results, we developed an agent-based mathematical model, which demonstrates the impact of neighbors based on efflux efficiency. Our findings hold true for co-cultures of Escherichia coli with and without pump expression and also in co-cultures of E . coli and Salmonella typhumirium . These results show how drug export and local microenvironments play a key role in defining single-cell level antibiotic resistance." @default.
• W2894617794 created "2018-10-12" @default.
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• W2894617794 date "2018-10-11" @default.
• W2894617794 modified "2023-10-16" @default.
• W2894617794 title "Antibiotic export by efflux pumps affects growth of neighboring bacteria" @default.
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• W2894617794 doi "https://doi.org/10.1038/s41598-018-33275-4" @default.
• W2894617794 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6181935" @default.
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