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Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms
OBJECTIVE: Relacin is a synthetic molecule that targets RelA, an essential protein in a conserved bacterial stress response system. It was shown to inhibit bacterial growth. The aims of this study were to evaluate the antimicrobial effect of relacin combined with sodium hypochlorite (NaOCl) on Enter...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Faculdade De Odontologia De Bauru - USP
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010329/ https://www.ncbi.nlm.nih.gov/pubmed/29898172 http://dx.doi.org/10.1590/1678-7757-2016-0608 |
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author | Yanling, CAI Hongyan, LIU Xi, WEI Wim, CRIELAARD Dongmei, DENG |
author_facet | Yanling, CAI Hongyan, LIU Xi, WEI Wim, CRIELAARD Dongmei, DENG |
author_sort | Yanling, CAI |
collection | PubMed |
description | OBJECTIVE: Relacin is a synthetic molecule that targets RelA, an essential protein in a conserved bacterial stress response system. It was shown to inhibit bacterial growth. The aims of this study were to evaluate the antimicrobial effect of relacin combined with sodium hypochlorite (NaOCl) on Enterococcus faecalis biofilms and to evaluate the cytotoxicity of relacin. MATERIAL AND METHODS: 48-h E. faecalis OG1RF biofilms were treated by various concentrations of relacin in order to determine its inhibitory concentration. Then, the 48-h biofilms were treated either with 1-min NaOCl (0.01%, 0.05%) alone, or in combination of relacin. As a means of comparison, the biofilms of ΔrelA were also treated by 1-min NaOCl (0.01%, 0.05%, 0.25%). The treatment efficacy was determined by agar plate count assays. The cytotoxicity of relacin was examined on human gingival epithelial cells Ca9-22 and murine fibroblasts NIH-3T3 by a methyl thiazolyltetrazolium (MTT) assay and a lactate dehydrogenase assay. Statistical analysis was performed by one-way or two-way analysis of variance (ANOVA) with Bonferroni’s post-hoc test and an independent Student’s t-test. A significance level of p<0.05 was used. RESULTS: Relacin inhibited the growth of OG1RF biofilms partially at 8 mM and fully at 14 mM. The relacin (14 mM) and NaOCl combined treatment resulted in significantly higher treatment efficacy than NaOCl treatment alone. At 0.05% NaOCl, the combined treatment resulted in 5.65 (±0.19) log reduction in biofilm viability. The ΔrelA biofilms were more susceptible to NaOCl treatment than the wild type biofilms at 0.25% NaOCl. Relacin at 14 mM was not toxic to host epithelial cells and fibroblasts. CONCLUSIONS: The combination of relacin with a low concentration of NaOCl was effective and not cytotoxic. |
format | Online Article Text |
id | pubmed-6010329 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Faculdade De Odontologia De Bauru - USP |
record_format | MEDLINE/PubMed |
spelling | pubmed-60103292018-06-25 Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms Yanling, CAI Hongyan, LIU Xi, WEI Wim, CRIELAARD Dongmei, DENG J Appl Oral Sci Original Article OBJECTIVE: Relacin is a synthetic molecule that targets RelA, an essential protein in a conserved bacterial stress response system. It was shown to inhibit bacterial growth. The aims of this study were to evaluate the antimicrobial effect of relacin combined with sodium hypochlorite (NaOCl) on Enterococcus faecalis biofilms and to evaluate the cytotoxicity of relacin. MATERIAL AND METHODS: 48-h E. faecalis OG1RF biofilms were treated by various concentrations of relacin in order to determine its inhibitory concentration. Then, the 48-h biofilms were treated either with 1-min NaOCl (0.01%, 0.05%) alone, or in combination of relacin. As a means of comparison, the biofilms of ΔrelA were also treated by 1-min NaOCl (0.01%, 0.05%, 0.25%). The treatment efficacy was determined by agar plate count assays. The cytotoxicity of relacin was examined on human gingival epithelial cells Ca9-22 and murine fibroblasts NIH-3T3 by a methyl thiazolyltetrazolium (MTT) assay and a lactate dehydrogenase assay. Statistical analysis was performed by one-way or two-way analysis of variance (ANOVA) with Bonferroni’s post-hoc test and an independent Student’s t-test. A significance level of p<0.05 was used. RESULTS: Relacin inhibited the growth of OG1RF biofilms partially at 8 mM and fully at 14 mM. The relacin (14 mM) and NaOCl combined treatment resulted in significantly higher treatment efficacy than NaOCl treatment alone. At 0.05% NaOCl, the combined treatment resulted in 5.65 (±0.19) log reduction in biofilm viability. The ΔrelA biofilms were more susceptible to NaOCl treatment than the wild type biofilms at 0.25% NaOCl. Relacin at 14 mM was not toxic to host epithelial cells and fibroblasts. CONCLUSIONS: The combination of relacin with a low concentration of NaOCl was effective and not cytotoxic. Faculdade De Odontologia De Bauru - USP 2018-05-29 /pmc/articles/PMC6010329/ /pubmed/29898172 http://dx.doi.org/10.1590/1678-7757-2016-0608 Text en https://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Yanling, CAI Hongyan, LIU Xi, WEI Wim, CRIELAARD Dongmei, DENG Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title | Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title_full | Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title_fullStr | Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title_full_unstemmed | Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title_short | Efficacy of relacin combined with sodium hypochlorite against Enterococcus faecalis biofilms |
title_sort | efficacy of relacin combined with sodium hypochlorite against enterococcus faecalis biofilms |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010329/ https://www.ncbi.nlm.nih.gov/pubmed/29898172 http://dx.doi.org/10.1590/1678-7757-2016-0608 |
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