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Applied and Environmental Microbiology
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Research Article

Reduced virulence of Yersinia enterocolitica by copper-induced injury.

A Singh, M W LeChevallier, G A McFeters
A Singh
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M W LeChevallier
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G A McFeters
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ABSTRACT

A sublethal concentration of copper (0.75 mg/liter) caused substantial injury (87 to 95%) of Yersinia enterocolitica serotype O:8 cells in 72 h at 4 degrees C without producing extensive cell death. Copper-injured cells had a higher 50% lethal dose in mice (2,700 CFU) than uninjured cells (150 CFU). This reduced virulence correlated with more rapid clearance of the injured cells from the blood of mice after intravenous inoculation. A possible role of the liver in this process was shown by significant cell accumulation in mouse livers when copper-injured Y. enterocolitica cells were administered, compared with uninjured bacteria. In vitro studies with isolated mouse liver membranes showed higher titers of aggregation with copper-injured cells than control cells. The in vitro aggregation reaction and blood clearance activity in vivo were abolished by sugars that are known to interact with a hepatic lectin. Our data suggest that copper-induced injury reduces the virulence of Y. enterocolitica and that the liver may be involved in nonimmune rapid clearance of the injured cells, probably by interaction with a hepatic lectin(s).

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Reduced virulence of Yersinia enterocolitica by copper-induced injury.
A Singh, M W LeChevallier, G A McFeters
Applied and Environmental Microbiology Aug 1985, 50 (2) 406-411; DOI:

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Reduced virulence of Yersinia enterocolitica by copper-induced injury.
A Singh, M W LeChevallier, G A McFeters
Applied and Environmental Microbiology Aug 1985, 50 (2) 406-411; DOI:
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