Biofilm formation, invasiveness and colicinogeny in locus of enterocyte and effacement negative O113:H21 Shigatoxigenic Escherichia coli.
J Appl Microbiol
; 122(4): 1101-1109, 2017 Apr.
Article
em En
| MEDLINE
| ID: mdl-28150898
ABSTRACT
AIMS:
Although Shiga toxins (Stx) are well-established virulence traits of O113H21 Shigatoxigenic Escherichia coli (STEC) strains, a shortage in the knowledge of other virulence properties that may contribute to pathogenesis may exist in this serotype. This study investigated biofilm, invasiveness and colicinogeny capabilities in O113H21 STEC isolated in Brazil, mostly from animal reservoirs. A search for genes that were reported to participate in the process of biofilm formation was also performed. METHODS ANDRESULTS:
The 34 O113H21 STEC isolates analysed were assayed for biofilm production in polystyrene microplates. Genes for biofilm were investigated by PCR. Invasion of cell lineages was assessed in gentamicin protection assays and colicinogeny was investigated by phenotypic tests. Fifty per cent of the strains were biofilm formers, and 35% exhibited an invasive behaviour. The pattern of distribution of biofilm-related genes did not correlate with biofilm phenotypes observed, and a high percentage of the investigated strains were able to secrete colicins.CONCLUSION:
Ability to form biofilm, invasiveness and colicinogeny is demonstrated for the first time in a collection of O113H21 STEC. SIGNIFICANCE AND IMPACT OF THE STUDY The ability to express three additional phenotypes besides Stx production may be a factor influencing the pathogenicity and persistence potential of O113H21 STEC.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Biofilmes
/
Escherichia coli Shiga Toxigênica
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Appl Microbiol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Brasil