Prophylactic properties of Bacillus subtilis in a bovine β-lactoglobulin sensitized mice model

Probiotics have gained considerable attention in recent years due to their biotechnological and immunomodulatory properties. The proteolytic activity and the protective effect of Bacillus subtilis isolated from Algerian goat milk preventing the development of allergic reactions were determined. On the base of SDS–PAGE analysis and the increase of detectable α-NH 2 groups, it can be concluded that the isolated isolate has high proteolytic activity. Oral administration of studied Bacillus subtilis DAF442 resulted in significantly lower titers of anti β-lactoglobulin IgG and IgE. This was correlated with a significant decrease in the anaphylactic response ex vivo as measured by reduced short circuit current (Isc) and epithelial conductance (G) and in vivo in mice. Bacillus subtilis DAF442 pretreatment promoted an important protection against changes in intestinal morphology induced by β-lactoglobulin. Hence it can be concluded that studied Bacillus subtilis strain with high proteolytic activity can modulate effectively the immune response and prevent allergic reactions against β-lactoglobulin.