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Inhibition of Virulence Gene Expression in Dublin, F5 and Associated With Neonatal Calf Diarrhea by Factors Produced by Lactic Acid Bacteria During Fermentation of Cow Milk

Overview
Journal Front Microbiol
Specialty Microbiology
Date 2022 May 31
PMID 35633687
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Abstract

Diarrhea is a major health problem in neonatal and young calves worldwide. It can be caused by a variety of infectious agents, including the bacteria serovar Dublin (. Dublin), enterotoxigenic (ETEC), and . Preventive alternatives to antibiotic treatment should be identified. As a first step toward this, the aim of the current study was to examine whether cell-free supernatants from cow milk fermented by lactic acid bacteria affects virulence-gene expression in strains of . Dublin, ETEC F5 and . pH-neutralized, cell-free, spent medium of milk (nCFSM) fermented by 61 different lactic acid bacteria (LAB) and non-LAB starter cultures belonging to 17 genera was assayed for their effect on expression of important virulence factors (. Dublin ; ETEC F5 ; ), when the bacteria were grown in the nCFSM. Screening was done using either a promoter-reporter expression system or RT-qPCR. nCFSM from BL-15955 and LR-33016 downregulated the expression of and genes in the four tested ETEC F5 strains without affecting their growth, while mainly BL-15955 downregulated expression of in the four tested strains of . nCFSM from the mixed cultures; NU-TRISH BY-Mild ( subsp. and BL-15954) and COMBO4 ( subsp. and ), as well as CNRZ32 downregulated the tested virulence genes in the three tested strains of . Dublin. To enable possible downregulation of the expression of virulence genes in all three target bacteria simultaneously, nCFSM was prepared from NU-TRISH By-Mild in combination with BL-15955 (i.e. a four-strain combination). The nCFSM from this combination downregulated the virulence genes expression in all the three species. In the future, NU-TRISH By-Mild and BL-15955 in combination could potentially be used for prevention of neonatal calf diarrhea caused by . Dublin, F5, and , reducing the need for antimicrobial treatment, however, field studies are needed to prove that.

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