Antiallergic activity of probiotics from Mongolian dairy products on type I allergy in mice and mode of antiallergic action

• Ten lactic acid bacteria strains were prepared from Mongolian dairy products.
• Lactobacillus plantarum 06CC2 was effective in all three allergy models used.
• 06CC2 enhanced secretion of IFN-γ and suppressed that of IL-4 from spleen cells.
• The secretion levels were confirmed in gene expression levels of Peyer's patches.
• 06CC2 probably promoted Th1 dominance through intestinal immunity.

Antiallergic activities of 10 lactic acid bacteria strains prepared from Mongolian dairy products as orally administered probiotics were examined in three murine type I allergy models (compound 48/80 stimulation, passive cutaneous anaphylaxis reaction, and ovalbumin sensitization models). Among the 10, only Lactobacillus plantarum strain 06CC2 significantly alleviated allergic symptoms in all three models and reduced the levels of total IgE, ovalbumin-specific IgE, and histamine in the sera of ovalbumin-sensitized mice. In vitro study, interferon-γ and interleukin-4 secretions from spleen cells of ovalbumin-sensitized mice administered the 06CC2 strain were significantly enhanced and suppressed, respectively, in the presence of ovalbumin. In Peyer's patches of ovalbumin-sensitized mice, strain 06CC2 significantly enhanced mRNA expressions of interferon-γ and interleukin-12 receptor β2, but suppressed that of the interleukin-4. Thus, strain 06CC2 probably promoted Th1 immunity through intestinal immunity and improved the Th1/Th2 balance in type I allergic mice, resulting in alleviation of allergic symptoms.