Prevention of pathogenic escherichia coli infection in mice and stimulation of macrophage activation in rats by an oral administration of probiotic lactpbacillus casei I-5

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  • Prevention of Pathogenic Escherichia coli Infection in Mice and Stimulation of Macrophage Activation in Rats by an Oral Administration of Probiotic Lactobacillus casei I-5
  • Prevention of Pathogenic<i>Escherichia coli</i>Infection in Mice and Stimulation of Macrophage Activation in Rats by an Oral Administration of Probiotic<i>Lactobacillus casei</i>I-5

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Lactobacillus casei I-5 isolated from an alcohol fermentation broth enhanced immunity and prevented pathogenic infection as a probiotic. Mice fed with I-5 cells for 11 days prior to an intraperitoneal challenge with pathogenic Escherichia coli Juhl exhibited a high survival rate compared with the control group. Rats fed with I-5 cells for 10 days significantly increased the phagocytosis of peritoneal macrophages. In a cell culture system employing peritoneal macrophages from rats, the I-5 administration activated NF-κB stimulated by LPS. It also enhanced LPS-stimulated IL-12 and TNF-α production, but not IL-6 production. These results show that L. casei I-5 effectively prevented infection by pathogenic E. coli possibly through the activation of peritoneal macrophages. The strain would be useful to prevent pathogenic microbial infections in humans and farm animals.

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