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Spores of two probiotic Bacillus species enhance cellular immunity in BALB/C mice.
Canadian Journal of Microbiology 2018 January
Previous studies found that Bacillus subtilis BS02 and B. subtilis subsp. natto BS04 isolated in our laboratory could activate the immune response of murine macrophages in vitro. This study aims to investigate the effects of dietary supplementation with Bacillus species spores on the systemic cellular immune response in BALB/C mice. Results showed that both B. subtilis BS02 and B. subtilis natto BS04 enhanced the phagocytic function of the mononuclear phagocyte system (MPS) and the cytotoxicity of natural killer (NK) cells. In addition, B. subtilis BS02 could increase the respiratory burst activity of blood phagocytes. Furthermore, B. subtilis BS02 and B. subtilis natto BS04 increased the percentage of gamma-interferon-producing CD4+ cells and CD8+ T-cells, but only BS04 increased the percentage of CD3+ cells and CD3+ CD4+ cells in splenocytes. However, there were no effects on other subsets of splenic lymphocytes and mitogen-induced splenic lymphocyte proliferation. All data suggested that oral administration of B. subtilis BS02 or B. subtilis natto BS04 could significantly enhance cellular immunity in BALB/C mice by increasing phagocytic activity of MPS and cytotoxic activity of NK cells in a strain-specific manner.
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