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• W4317608975 abstract "Banning antibiotic growth promotors and other antimicrobials in poultry production due to the increasing antimicrobial resistance leads to increased feeding of potential alternatives such as probiotics. However, the modes of action of those feed additives are not entirely understood. They could act even with a direct effect on the immune system. A previously established animal-related in vitro system using primary cultured peripheral blood mononuclear cells (PBMCs) was applied to investigate the effects of immune-modulating feed additives. Here, the immunomodulation of different preparations of two probiotic Bacillus strains, B. subtilis DSM 32315 (BS), and B. amyloliquefaciens CECT 5940 (BA) was evaluated. The count of T-helper cells and activated T-helper cells increased after treatment in a ratio of 1:3 (PBMCs: Bacillus) with vital BS (CD4+: p < 0.05; CD4+CD25+: p < 0.01). Furthermore, vital BS enhanced the proliferation and activation of cytotoxic T cells (CD8+: p < 0.05; CD8+CD25+: p < 0.05). Cell-free probiotic culture supernatants of BS increased the count of activated T-helper cells (CD4+CD25+: p < 0.1). UV-inactivated BS increased the proportion of cytotoxic T cells significantly (CD8+: p < 0.01). Our results point towards a possible involvement of secreted factors of BS in T-helper cell activation and proliferation, whereas it stimulates cytotoxic T cells presumably through surface contact. We could not observe any effect on B cells after treatment with different preparations of BS. After treatment with vital BA in a ratio of 1:3 (PBMCs:Bacillus), the count of T-helper cells and activated T-helper cells increased (CD4+: p < 0.01; CD4+CD25+: p < 0.05). Cell-free probiotic culture supernatants of BA as well as UV-inactivated BA had no effect on T cell proliferation and activation. Furthermore, we found no effect of BA preparations on B cells. Overall, we demonstrate that the two different Bacillus strains enhanced T cell activation and proliferation, which points towards an immune-modulating effect of both strains on chicken immune cells in vitro. Therefore, we suggest that administering these probiotics can improve the cellular adaptive immune defense in chickens, thereby enabling the prevention and reduction of antimicrobials in chicken farming." @default.
• W4317608975 created "2023-01-21" @default.
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• W4317608975 date "2023-01-19" @default.
• W4317608975 modified "2023-09-26" @default.
• W4317608975 title "Probiotic Bacillus Strains Enhance T Cell Responses in Chicken" @default.
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• W4317608975 doi "https://doi.org/10.3390/microorganisms11020269" @default.
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