Anti-allergic effects of a mixture of Saccharomyces cerevisiae and its specific goat's milk immunoglobulin G rich fraction on ovalbumin sensitized BALB/c mice
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In this study, we investigated the effects of oral ingestion of Saccharomyces (S.) cerevisiae and its specific immunoglobulin (Ig) G-rich fraction, prepared from goat's milk, on immune function in an allergic rhinitis mouse model, ovalbumin (OVA)-sensitized BALB/c mice. Sneezing activity in mice that were administered a feed containing a mixture of S. cerevisiae and its specific goat's milk IgG-rich fraction (mixture group) was significantly lower than that in mice administered the mixture-free feed (control group) at age 11 and 12 weeks, although the activity in mice that were given a feed containing S. cerevisiae (yeast group) was similar to that of the control group. We found that the ratio of spleen interferon-gamma(+)CD4(+) cell/interleukin (IL)-4(+)CD4(+) cell was higher in the mixture and yeast groups than the control group. The number of spleen CD80(+)CD11b(+) cells was significantly lower in the mixture and yeast groups than the control group. In contrast, the numbers of spleen CD122(+)CD8 alpha(+) and IL-10(+)CD4(+) cells were significantly higher in the mixture group than the control and yeast groups while the numbers of IgE(+)B220(+) and Fc epsilon RI alpha(+)CD117(+) cells were significantly lower in the mixture group. These results suggested that the mixture of S. cerevisiae and its specific goat's milk IgG-rich fraction reduced OVA-induced allergic symptoms in BALB/c mice via the induction of suppressor T cells and the reduction of Ig E-producing cells and high affinity IgE receptor-positive mast cells rather than the adjustment of the Th1/Th2 balance.
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