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Lactobacillus casei BL23 modulates the innate immune response in Staphylococcus aureus-stimulated bovine mammary epithelial cells

In: Beneficial Microbes
Authors:
R.F.S. Souza INRA, UMR 1253 STLO, 65 Rue de Saint-Brieuc, 35000 Rennes, France.
Agrocampus Ouest, UMR 1253 STLO, 85 Rue de Saint Brieuc, 35042 Rennes, France.
Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, 31270-901 MG, Brazil.
Universidade Federal do Vale do São Francisco, Av. José de Sá Maniçoba, S/N Centro, Petrolina, 56304-917 PE, Brazil.

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L. Rault INRA, UMR 1253 STLO, 65 Rue de Saint-Brieuc, 35000 Rennes, France.
Agrocampus Ouest, UMR 1253 STLO, 85 Rue de Saint Brieuc, 35042 Rennes, France.

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N. Seyffert Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, 31270-901 MG, Brazil.

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V. Azevedo Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, 31270-901 MG, Brazil.

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Y. Le Loir INRA, UMR 1253 STLO, 65 Rue de Saint-Brieuc, 35000 Rennes, France.
Agrocampus Ouest, UMR 1253 STLO, 85 Rue de Saint Brieuc, 35042 Rennes, France.

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S. Even INRA, UMR 1253 STLO, 65 Rue de Saint-Brieuc, 35000 Rennes, France.
Agrocampus Ouest, UMR 1253 STLO, 85 Rue de Saint Brieuc, 35042 Rennes, France.

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Probiotics have been adopted to treat and prevent various diseases in humans and animals. They were notably shown to be a promising alternative to prevent mastitis in dairy cattle. This inflammation of the mammary gland is generally of infectious origin and generates extensive economic losses worldwide. In a previous study, we found that Lactobacillus casei BL23 was able to inhibit the internalisation of Staphylococcus aureus, one of the major pathogens involved in mastitis, into bovine mammary epithelial cells (bMEC). In this study, we further explored the capacity of this strain to modulate the innate immune response of bovine mammary epithelial cells during S. aureus infection. L. casei BL23 was able to decrease the expression of several pro-inflammatory cytokines, including interleukins 6, 8, 1α and 1β and tumour necrosis factor alpha, in S. aureus-stimulated bMEC, 8 h post-infection. On the other hand, L. casei did not impair the induction of defensins, such as lingual antimicrobial peptide and defensin β1 in the presence of S. aureus, and even slightly increased the induction of tracheal antimicrobial peptide during S. aureus infection. Finally, this strain did not alter the expression of the pattern recognition receptor nucleotide-binding oligomerisation domain proteins (NOD2). This study demonstrates that L. casei BL23 displayed anti-inflammatory properties on S. aureus-stimulated bMEC. These results open the way to further characterisation of the BL23 probiotic potential in a bovine mammary gland context and to a better understanding of how all these beneficial properties combine in vivo to combat mastitis pathogens.

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