Author(s): Ferreira, Joseane Cristina ; Penha Filho, Rafael Antonio Casarin [UNESP] ; Kuaye, Ana Paula Yorika ; Andrade, Leonardo Neves ; Chang, Yung-Fu ; Darini, Ana Lúcia Costa
Date: 2018
Persistent ID: http://hdl.handle.net/11449/171324
Origin: Oasisbr
Subject(s): Adhesion; Antibiotic resistance; Enterobacteriaceae; Food-producing animal; Invasion
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
There is an increasing number of reports worldwide about multidrug resistance (MDR) with potential of ExPEC in commensal E. coli. The present study evaluated the potential ExPEC in selected 44 MDR E.coli isolates, collected from livestock. ExPEC isolates were characterized by analysis of five main groups of virulence genes (papA and/or papC, sfa and/or foc, afa and/or dra, kpsMT II and iutA). We also determined the increased virulence potential analyzing other 29 virulence genes, the epidemiology of these isolates. Additionally, fifteen ExPEC isolates were selected to evaluate the adhesion and invasion capacity in vitro using Caco-2 cells. Based on the analysis of the five main virulence genes, 72.7% (32/44) strains were classified as ExPEC. The presence of each gene was iutA 88.6%, KpsMT II 70.4%, papC 25%, sfa/focDE 4.5%; afa/draBC genes were not found. All E. coli isolates were classified into: phylogenetic groups A (34%), B1 (10%), B2 (20%), and D (36%). MLST revealed 7 different STs among isolates, including a new ST identified (ST5687). The in vitro assay in Caco-2 cells showed that all isolates were capable to adhere or invade the epithelial cells, although this occurred at variable levels. The ExPEC isolate LO122 reached similar levels of invasion to the positive control strain Salmonella Typhimurium LT2. These results showed that the apparently commensal microbiota of poultry harbors MDR ExPEC isolates with high adhesion and invasion potential.
School of Pharmaceutical Sciences of Ribeirão Preto University of São Paulo (USP)
School of Agricultural and Veterinary Sciences São Paulo State University (UNESP)
College of Veterinary Medicine Cornell University
School of Agricultural and Veterinary Sciences São Paulo State University (UNESP)
FAPESP: 2017/00620-0
CNPq: CNPq/PNPD/2017
