ABSTRACT
Objectives
To evaluate strains of Enterococcus faecalis isolated from endodontic failures cases for (a) presence of virulence genes, namely, gelatinase production (gelE), surface protein (esp), collagen-binding adhesin (ace), cytolysin activator (cylA), E. faecalis antigen A (efaA) and aggregation substance (asa), all by using PCR; (b) biofilm formation capacity; and (c) activity of gelatinase and β-lactamase.
Materials and methods
Twenty-five strains of E. faecalis were tested. The DNA extracted from these strains was used for identification of virulence genes by PCR and 1% agarose gel. Biofilm formation was performed on polystyrene microplates by using the violet crystal staining method. For assessment of the gelatinase activity, inoculum of pure cultures was deposited in tubes containing gelatin and a nutrient broth, whereas nitrocefin disks were used to assess the β-lactamase action.
Results
The virulence genes efaA and cylA were detected in 100% of the strains, whereas gelE was present in 84%, ace in 68%, esp in 56% and asa in 48%. Four strains had no biofilm formation, 17 had poor formation and four had moderate formation. Gelatinase production was observed in three strains and β-lactamase resistance in five strains of E. faecalis.
Topic
Diverse patterns of virulence gene detection were observed among the E. faecalis strains, with predominance of those capable of forming biofilm. A few strains have been found to hydrolyze gelatin proteins, whereas β-lactamase resistance was detected in different isolates.
Clinical relevance
To understand the influence of virulence factors in E. faecalis on the host heath status.
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Funding
This work was financially supported by the Brazilian agencies Sao Paulo Research Foundation (FAPESP, 2015/23479-5, 2017/16516-7; 2017/26973-6 e 2018/00587-5;), National Council for Scientific and Technological Development (CNPq 308162/2014-5, 303852/2019-4) and Coordination for the Improvement of Higher Education Personnel (CAPES, finance code 001).
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Francisco, P.A., Fagundes, P.I.d.G., Lemes-Junior, J.C. et al. Pathogenic potential of Enterococcus faecalis strains isolated from root canals after unsuccessful endodontic treatment. Clin Oral Invest 25, 5171–5179 (2021). https://doi.org/10.1007/s00784-021-03823-w
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DOI: https://doi.org/10.1007/s00784-021-03823-w