The ability of milk fermented with
Lactobacillus plantarum ONC141, to confer protection against
Salmonella typhimurium was investigated in mice. Feeding mice with the fermented milk conferred protection against oral challenge with virulent
S. typhimurium, as compared with control mice that were received with commercial milk. So as to make an action mechanisms of the protection clear, some basic immunological tests attempted to try. An antibacterial activity of the fermented milk against
S. typhimurium in
vitro was not detected. Spleen cells from mice given the fermented milk produced significantly higher amounts of interferon-γ in response to stimulation with concanavalin A than the cells from the control mice. The fermented milk feeding had no significant effect on interleukin-4 production by spleen cells. Peyer's patch cells from mice given the fermented milk produced higher amounts of total IgA, in response to stimulation with heat killed
S. typhimurium than cells from the control mice. These results suggest that milk fermented with
L. plantarum ONC141 might be able to modulate the host immune system of both mucosal and acquired immunity in mice. Thus dietary supplementation with milk fermented with
L. plantarum ONC141 might provides an unique opportunity for developing immune-enhancing probiotic dairy products with contribution to health benefits.
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