Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Survey on phenotypic resistance in Enterococcus faecalis: comparison between the expression of biofilm-associated genes in Enterococcus faecalis persister and non-persister cells

Wed Nov 30 16:28:46 2022

(UNSPECIFIED) Survey on phenotypic resistance in Enterococcus faecalis: comparison between the expression of biofilm-associated genes in Enterococcus faecalis persister and non-persister cells. Molecular Biology Reports. p. 9. ISSN 0301-4851

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Abstract

Background Phenotypic resistance is considered as a serious therapeutic challenge for which a definitive remedy has not been discovered yet. Biofilm and persister cell formation are two well-studied phenotypic resistance phenomena, leading to the recalcitrance and relapse of different types of chronic infections. The presence of persister cells in biofilm structures seems to be one of the main factors contributing to the relapse of infections and treatment failure. Given the dormant and inert nature of persister cells, they can be easy targets for the immune system factors. Biofilm formation can be a survival strategy for the defenseless persister cells. Thus, this study was aimed to evaluate the expression of biofilm-associated genes in Enterococcus faecalis persister and non-persister cells. Methods Vancomycin susceptibility and biofilm formation ability were investigated among 95 E. faecalis clinical isolates using microtiter broth dilution and microtiter plate assays, respectively. PCR was used to determine the presence of biofilm-related genes (gelE, esp, and agg) among the vancomycin-susceptible, biofilm producer E. faecalis isolates (91 isolates). Minimum bactericidal concentration for biofilms (MBCB) were determined for vancomycin using the MTP assay. Bacterial persister assay was performed using an enzymatic lysis assay. Finally, the expression of biofilm-related genes was compared between the persister and non-persister isolates of E. faecalis using real-time qPCR. Results E. faecalis isolates showed a high level of susceptibility (95.8) to vancomycin (MIC < 1 mu g/mL). The gelE, esp, and agg genes were found in 91 (100), 72 (79.12), and 74 (81.32) of the isolates, respectively. All the E. faecalis isolates were tolerant to vancomycin in the biofilm condition, showing a MBCB of > 2500 mu g/mL. Based on the enzymatic lysis assay, only 3 isolates, out of the 91, had the ability to form persister cells. The expression of biofilm-associated genes was higher among the persister compared to non-persister E. faecalis isolates. Conclusions Biofilm-associated persister cells indicated a high vancomycin tolerance compared to non-persister cells. Moreover, persister isolates showed a higher tendency for biofilm formation and a higher expression level of the biofilm-associated genes, compared to non-persister isolates.

Item Type: Article
Creators:
CreatorsEmail
Kaviar, V. H.UNSPECIFIED
Khoshnood, S.UNSPECIFIED
Asadollahi, P.UNSPECIFIED
Kalani, B. S.UNSPECIFIED
Maleki, A.UNSPECIFIED
Yarahmadi, S.UNSPECIFIED
Pakzad, I.UNSPECIFIED
Keywords: E faecalis Biofilm formation Persister Tolerance Vancomycin Phenotypic resistance real-time pcr staphylococcus-aureus vancomycin tolerance virulence infections therapy serum Biochemistry & Molecular Biology
Divisions:
Page Range: p. 9
Journal or Publication Title: Molecular Biology Reports
Journal Index: ISI
Identification Number: https://doi.org/10.1007/s11033-021-06915-8
ISSN: 0301-4851
Depositing User: مهندس مهدی شریفی
URI: http://eprints.medilam.ac.ir/id/eprint/3668

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