e e ect of Lactobacillus johnsonii Ncc533 (La1) on the balance of 1/ 2 cells in BALB/c mice Abstract Purpose: To determine the e ect of Lactobacillus johnsonii Ncc533 (La1) on 1/ 2 balance, the production of IL-4 and IFN-γ by splenocytes was evaluated following its administration to mice from newborn to adult. Changes in IL-4 and IFN-γ expression and serum levels of OVA-speci c-IgE were then investigated in an asthma model.
Methods:Using ow cytometry (FCM) and ELISA, the percentage of IL-4 and IFN-γ expressing splenocytes and serum levels of OVA-speci c-IgE were measured in di erent groups of mice.Results: e percentages of IL-4 and IFN-γ expressing splenocytes in the o spring and in the adults of the La1-treated group were not signi cantly di erent when compared with the water-treated group. In the asthma model, the percentages of IL-4 expressing cells and the serum levels of OVA-speci c-IgE in the La1-treated and water-treated group were signi cantly increased compared with those in the control group. e percentage of IFN-γ expressing cells was signi cantly lower in the La1-treated and water-treated groups. e percentage of IL-4 expressing cells and the serum levels of OVA-speci c-IgE in the La1-treated group were signi cantly lower compared with those in the water-treated group, whereas the percentage of IFN-γ expressing cells was signi cantly higher.Conclusion: Administration of La1 had no e ect on the immune system from the neonate to the adult in the normal mice. It did, however, signi cantly alter the percentages of IL-4 or IFN-γ expressing CD4 + T lymphocytes in the asthma model, suggesting that administration of La1 might regulate the immune response.ORIGINAL RESEARCH