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Predojević, Luka; Keše, Darja; Žgur Bertok, Darja; Železnik Ramuta, Taja; Veranič, Peter; Erdani Kreft, Mateja; Starčič Erjavec, Marjanca
Microorganisms (Basel), 04/2022, Letnik: 10, Številka: 4Journal Article
Urinary tract infections can be severe, sometimes fatal, diseases whose etiological pathogens are predominantly uropathogenic strains of (UPEC). To investigate the UPEC pathogenesis, several models have already been established with minor or major disadvantages. The aim was to develop a simple, fast, and inexpensive biomimetic in vitro model based on normal porcine urothelial (NPU) cells that are genetically and physiologically similar to human bladder urothelium and to perform basic studies of pathogenicity. Initially, the model was tested using a set of control strains and, subsequently, with human strains isolated either from patients with urinary infections or from the feces of healthy individuals. A drop in viability of NPU cells was used as a measure of the pathogenicity of the individual strain tested. To visualize the subcellular events, transmission and scanning electron microscopy was performed. The strains were tested for the presence of different virulence-associated genes, phylogroup, type of core lipid, O-serotype, and type of lipopolysaccharide and a statistical analysis of possible correlations between strains' characteristics and the effect on the model was performed. Results showed that our model has the discriminatory power to distinguish pathogenic from non-pathogenic strains, and to identify new, potentially pathogenic strains.
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