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Open AccessArticle

Molecular and Phenotypic Characterization of Escherichia coli Associated with Granulomatous Colitis of Boxer Dogs

Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
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Antibiotics 2020, 9(9), 540; https://doi.org/10.3390/antibiotics9090540
Received: 5 August 2020 / Revised: 22 August 2020 / Accepted: 24 August 2020 / Published: 25 August 2020
(This article belongs to the Special Issue Pathogenic Escherichia coli: Infections and Therapies)
Invasive Escherichia coli is causally associated with granulomatous colitis (GC) of Boxer dogs and French Bulldogs. The virulence determinants of GC E. coli are unclear. E. coli isolated from 16 GC (36 strains) and 17 healthy control (HC: 33 strains) dogs were diverse in phylogeny, genotype, and serotype and lacked diarrheagenic genes. Genes encoding type II (gsp), IV (traC), and VI (hcp) secretion systems, long polar fimbriae (lpfA154/141), and iron acquisition (fyuA, chuA) were frequent in GC and HC. E. coli from 14/15 GC and 10/11 HC invaded Caco-2 better than non-pathogenic E. coli strain DH5α, with invasion correlated with motility and presence of chuA and colV. E. coli from all GC and 10/11 HC survived better than DH5α in J774 macrophages, with adherent-invasive E. coli (AIEC) in 60% GC and 73% HC. AIEC replicated in monocyte derived macrophages from a GC Boxer with CD48/SLAM risk haplotype but not the HC. Fluroquinolone resistant E. coli were less motile and invasive than fluoroquinolone sensitive (p < 0.05), and only 1/8 resistant strains met criteria for AIEC. In conclusion GC E. coli are diverse, resemble extraintestinal pathogenic E. coli (ExPEC), including AIEC, and can replicate in GC-susceptible macrophages. They are likely resident pathosymbionts that can opportunistically persist within macrophages of a GC-susceptible dog. View Full-Text
Keywords: granulomatous colitis; Boxer dogs; Escherichia coli; adherent-invasive E. coli (AIEC); monocyte derived macrophages; fluoroquinolone; Crohn’s disease; CD48/SLAM; very early onset inflammatory bowel disease (IBD) granulomatous colitis; Boxer dogs; Escherichia coli; adherent-invasive E. coli (AIEC); monocyte derived macrophages; fluoroquinolone; Crohn’s disease; CD48/SLAM; very early onset inflammatory bowel disease (IBD)
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Dogan, B.; Zhang, S.; Kalla, S.E.; Dogan, E.I.; Guo, C.; Ang, C.R.; Simpson, K.W. Molecular and Phenotypic Characterization of Escherichia coli Associated with Granulomatous Colitis of Boxer Dogs. Antibiotics 2020, 9, 540.

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