1. Monoassociation with probiotic Lactobacillus delbrueckii UFV-H2b20 stimulates the immune system and protects germfree mice against Listeria monocytogenes infection.
- Author
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dos Santos LM, Santos MM, de Souza Silva HP, Arantes RM, Nicoli JR, and Vieira LQ
- Subjects
- Animals, Germ-Free Life, Interferon-gamma metabolism, Interleukin-10, Lactobacillus delbrueckii physiology, Listeriosis mortality, Liver microbiology, Mice, Nitric Oxide metabolism, Peritoneal Cavity microbiology, Spleen microbiology, Survival Analysis, Tumor Necrosis Factor-alpha metabolism, Antibiosis, Immunity, Mucosal, Lactobacillus delbrueckii immunology, Listeria monocytogenes growth & development, Listeriosis immunology, Listeriosis prevention & control, Probiotics
- Abstract
In the present study, we investigated the protective effects of Lactobacillus delbrueckii UFV-H2b20 on the resistance to Listeria monocytogenes infection in gnotobiotic mice. Germfree mice or monoassociated mice were infected with L. monocytogenes, and the microbiological and immunological responses were evaluated after 1, 3, and 5 days of infection. Monoassociation with L. delbrueckii was capable of protecting mice against death caused by L. monocytogenes and induced a faster clearance of the bacteria in the liver, spleen, and peritoneal cavity at days 1, 3, and 5 post-infection. Also, monoassociated mice displayed less liver injury than germfree mice. The production of TNF-α in the serum, peritoneal cavity, and gut was augmented in monoassociated mice. Likewise, the levels of IFN-γ found on supernatants of spleen cells cultures were higher after the monoassociation. In addition, increased production of nitric oxide in peritoneal cell cultures supernatants and in serum was observed in mice that received L. delbrueckii. The monoassociation with L. delbrueckii induced higher production of IL-10 in the mucosal immune system. We conclude that monoassociation with L. delbrueckii UFV-H2b20 protects mice from death caused by L. monocytogenes infection by favoring effector responses while preventing their immunopathological consequences.
- Published
- 2011
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