Screening of probiotic Lactobacilli with potential anti-allergic activity based on hyaluronidase inhibition and degranulation of RBL-2H3 cells in vitro

In the present study, the probiotic potential of lactic acid bacteria (LAB) isolated from different dairy sources were evaluated, and probiotics with anti-allergic activity were further screened based on the hyaluronidase inhibition assay and the degranulation of RBL-2H3 cells in vitro. As a result, Out of 20 strains, 15 LAB exhibited desirable probiotic properties and safety in vitro. Considering the suppressive activities on hyaluronidase and beta-hexosaminidase release in degranulation-induced RBL-2H3 cells, strains LZ077E, LZ183E, and LZ260E exhibited potential probiotic properties that could be useful for alleviating allergic diseases. To evaluate the reliability of this result, the efficacy of these three strains on the expression of some cytokines and proteins in the signal pathway related to the Fc epsilon RI receptor on the RBL-2H3 cell surface were analyzed. The results show three strains exhibited remarkable downregulation of histamine and cytokines TNF-alpha and IL-4. Similarly, immunoblot analysis revealed that the probiotics also significantly decreased the phosphorylation of Lyn and Syk in RBL-2H3 cells. Our preliminary results may provide some scientific support for the use of probiotics for the treatment of allergic and inflammatory diseases, as well as the rapid screening of anti-allergic active probiotics in vitro.

Automated summary

This study evaluated the probiotic potential of lactic acid bacteria from different dairy sources and screened probiotics with anti-allergic activity, analyzing their effects on cell signaling pathways and cytokines. Some strains showed potential anti-allergic properties and could be used for alleviating allergic diseases, as demonstrated by their downregulation of histamine and cytokines TNF-alpha and IL-4. Additionally, the probiotics significantly decreased the phosphorylation of Lyn and Syk in RBL-2H3 cells, suggesting their potential for treating allergic and inflammatory diseases.