Role of extracellular DNA in Enterococcus faecalis biofilm formation and its susceptibility to sodium hypochlorite
J. appl. oral sci
; 27: e20180699, 2019. graf
Article
en En
| LILACS, BBO
| ID: biblio-1012504
Biblioteca responsable:
BR1.1
ABSTRACT
Abstract Objective This study investigated the role of extracellular deoxyribonucleic acid (eDNA) on Enterococcus faecalis ( E. faecalis ) biofilm and the susceptibility of E. faecalis to sodium hypochlorite (NaOCl). Methodology E. faecalis biofilm was formed in bovine tooth specimens and the biofilm was cultured with or without deoxyribonuclease (DNase), an inhibitor of eDNA. Then, the role of eDNA in E. faecalis growth and biofilm formation was investigated using colony forming unit (CFUs) counting, eDNA level assay, crystal violet staining, confocal laser scanning microscopy, and scanning electron microscopy. The susceptibility of E. faecalis biofilm to low (0.5%) or high (5%) NaOCl concentrations was also analyzed by CFU counting. Results CFUs and biofilm formation decreased significantly with DNase treatment (p<0.05). The microstructure of DNase-treated biofilms exhibited less structured features when compared to the control. The volume of exopolysaccharides in the DNase-treated biofilm was significantly lower than that of control (p<0.05). Moreover, the CFUs, eDNA level, biofilm formation, and exopolysaccharides volume were lower when the biofilm was treated with DNase de novo when compared to when DNase was applied to matured biofilm (p<0.05). E. faecalis in the biofilm was more susceptible to NaOCl when it was cultured with DNase (p<0.05). Furthermore, 0.5% NaOCl combined with DNase treatment was as efficient as 5% NaOCl alone regarding susceptibility (p>0.05). Conclusions Inhibition of eDNA leads to decrease of E. faecalis biofilm formation and increase of susceptibility of E. faecalis to NaOCl even at low concentrations. Therefore, our results suggest that inhibition of eDNA would be beneficial in facilitating the efficacy of NaOCl and reducing its concentration.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
BBO
/
LILACS
Asunto principal:
Hipoclorito de Sodio
/
ADN Bacteriano
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Enterococcus faecalis
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Biopelículas
/
Desoxirribonucleasas
Límite:
Animals
Idioma:
En
Revista:
J. appl. oral sci
Asunto de la revista:
ODONTOLOGIA
Año:
2019
Tipo del documento:
Article
País de afiliación:
Italia
/
Singapur
/
Corea del Sur
Pais de publicación:
BR
/
BRASIL
/
BRASILE
/
BRAZIL
/
BRESIL