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Category:Computer-aided design software for LinuxSystemic infection with enteroaggregative Escherichia coli enhances colonic tumorigenesis and liver metastasis in a colitis-associated cancer mouse model.
In this study, we established a colitis-associated cancer (CAC) mouse model to investigate the role of enteroaggregative Escherichia coli (EAEC) in colonic tumorigenesis and liver metastasis. The EAEC strain NUBL-2 was orally inoculated into a C57BL/6 mouse at a dose of 1.1 x 10(8) CFU/mouse. The EAEC-inoculated mice developed colonic tumors much more frequently than the control mice. The increase in tumor frequency was associated with enhanced cytokine production in the colonic mucosa. The potential of EAEC to colonize human colonic mucosa was investigated in vitro, and the results suggested that EAEC colonized the colonic mucosa. The expression of the bacterial virulence genes cfa/focDE, cnf1 and eaeA was observed in the colonic mucosa of mice inoculated with EAEC. The expression of bacterial virulence factors was also examined in human colonic mucosa inoculated with EAEC in vitro. The EAEC strain used in this study colonized the colonic mucosa in a number of patients with various intestinal disorders. EAEC strains colonized the colonic mucosa obtained from the patients with inflammatory bowel disease as well as from the patients without gastrointestinal disorders. These results suggest that EAEC is a potential pathogen and that colonic tumorigenesis may be facilitated in cases of concurrent systemic infection with EAEC. 82fe58eafd
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