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• W4306688284 endingPage "e11154" @default.
• W4306688284 startingPage "e11154" @default.
• W4306688284 abstract "Biofilm formation is a key factor in the pathogenesis of enterococcal infections. Thus, the biofilm-forming ability and frequency of biofilm-related genes in penicillin-resistant, ampicillin-susceptible Enterococcus faecalis (PRASEF) compared to penicillin- and ampicillin-susceptible E. faecalis (PSASEF) were assessed in the present study. In addition, the effect of sub-inhibitory concentrations (sub-MICs) of antibiotics on biofilm formation and expression of virulence genes was evaluated. Twenty PRASEF and 21 PSASEF clinical isolates were used to determine the effect of sub-MICs of antibiotics (ampicillin, penicillin, and gentamicin) on biofilm formation, and ten selected isolates were subjected to RT-qPCR to detect the transcript levels of virulence genes (efaA, asa1, esp, and ace). Antibiotic susceptibility was evaluated by the microdilution broth method. Biofilm formation assay was performed using the microtiter plate method. All PSASEF and PRASEF isolates produced biofilms in vitro. Most isolates had three or four virulence genes. Sub-MICs of ampicillin significantly decreased biofilm production and expression of ace and asa1 genes, although the transcript levels were significantly lower (-350% and -606.2%, respectively) among the PSASEF isolates only. Sub-MICs of gentamicin did not have any significant effect on biofilm formation, but slightly increased the transcript levels of efaA. In conclusion, this study showed that the biofilm-forming ability and frequency of the evaluated virulence genes were similar among the PRASEF and PSASEF isolates. Further, in vitro antibiotic sub-MICs were confirmed to interfere with the expression pattern of virulence genes and biofilm formation by E. faecalis. However, further studies are required to clarify the role of sublethal doses of antibiotics on enterococcal biofilms." @default.
• W4306688284 created "2022-10-19" @default.
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• W4306688284 date "2022-10-01" @default.
• W4306688284 modified "2023-09-30" @default.
• W4306688284 title "Effect of sub-inhibitory concentrations of antibiotics on biofilm formation and expression of virulence genes in penicillin-resistant, ampicillin-susceptible Enterococcus faecalis" @default.
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• W4306688284 doi "https://doi.org/10.1016/j.heliyon.2022.e11154" @default.
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