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Heat inactivation partially preserved barrier and immunomodulatory effects of Lactobacillus gasseri LA806 in an in vitro model of bovine mastitis

F. Blanchet 1, 2 L. Rault 1 V. Peton 1, 3 Y. Le Loir 1 C. Blondeau 2 L. Lenoir 2 M. Dubourdeaux 2 Sergine Even 1
2 PiLeJe
STLO - Science et Technologie du Lait et de l'Oeuf
3 Wamine
STLO - Science et Technologie du Lait et de l'Oeuf
Abstract : Probiotics could help combat infections and reduce antibiotic use. As use of live bacteria is limited in some cases by safety or regulatory concerns, the potential of inactivated bacteria is worth investigating. We evaluated the potential of live and heat-inactivated Lactobacillus gasseri LA806 to counteract Staphylococcus aureus and Escherichia coli infection cycles in an in vitro model of bovine mastitis. We assessed the ability of live and inactivated LA806 to impair pathogen colonisation of bovine mammary epithelial cells (bMECs) and to modulate cytokine expression by pathogen-stimulated bMECs. Live LA806 induced a five-fold decrease in S. aureus adhesion and internalisation (while not affecting E. coli colonisation) and decreased pro-inflammatory cytokine expression by S. aureus-stimulated bMECs (without interfering with the immune response to E. coli). The ability of inactivated LA806 ability to diminish S. aureus colonisation was twofold lower than that of the live strain, but its anti-inflammatory properties were barely impacted. Even though LA806 effects were impaired after inactivation, both live and inactivated LA806 have barrier and immunomodulatory properties that could be useful to counteract S. aureus colonisation in the bovine mammary gland. As S. aureus is involved in various types of infection, LA806 potential would worth exploring in other contexts.
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https://hal.inrae.fr/hal-03121066
Contributor : Anne Giboulot <>
Submitted on : Tuesday, January 26, 2021 - 10:07:55 AM
Last modification on : Thursday, May 27, 2021 - 12:14:39 PM

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F. Blanchet, L. Rault, V. Peton, Y. Le Loir, C. Blondeau, et al.. Heat inactivation partially preserved barrier and immunomodulatory effects of Lactobacillus gasseri LA806 in an in vitro model of bovine mastitis. Beneficial Microbes, Wageningen Academic Publishers In press, pp.1-12. ⟨10.3920/BM2020.0146⟩. ⟨hal-03121066⟩

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