Effect of oral administration of Lactobacillus paracasei L9 on mouse systemic immunity and the immune response in the intestine

Authors

  • Yuanbo Zhu College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083
  • Jun Zhu Key Laboratory of Functional Dairy, Beijing 100083
  • Liang Zhao Key Laboratory of Functional Dairy, Beijing 100083
  • Ming Zhang School of Food and Chemical Engineering, Beijing Technology and Business University, Beijing 100083
  • Huiyuan Guo Key Laboratory of Functional Dairy, Beijing 100083
  • Fazheng Ren College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083

Abstract

probiotic strain Lactobacillus paracasei L9, which was isolated from human intestine, was investigated for its immunomodulatory activity in vivo. Results showed that L9 improved systemic immunity by enhancing the phagocytic activity of peritoneal macrophages, the proliferation ratio of splenocytes, the IgG level in the serum and the level of IgA in the mucosa. Further, L9 induced the Th1-polarized immune response by elevating the IFN-γ/IL-4 ratio in the mucosa. This effect was confirmed by the enhanced IL-12-inducing activity of macrophages after in vitro stimulation of L9. Also detected was increased expression of TLR-2 mRNA in the mucosa. We predict that L9 could enhance innate immunity by activating TLR-2 in the mucosa, and enhance acquired immunity by promoting Th1 polarization through induced production of IL-12 by macrophages.

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Published

2016-06-27

How to Cite

1.
Zhu Y, Zhu J, Zhao L, Zhang M, Guo H, Ren F. Effect of oral administration of Lactobacillus paracasei L9 on mouse systemic immunity and the immune response in the intestine. Arch Biol Sci [Internet]. 2016Jun.27 [cited 2024Apr.22];68(2):311-8. Available from: https://www.serbiosoc.org.rs/arch/index.php/abs/article/view/772

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Articles