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Abstract

Alterations to the gut microbiota can cause an amplification of the inflammatory response to intestinal pathogens. We assessed the effect of Bacteroides thetaiotaomicron and Lactobacillus johnsonii on the elimination of Candida species and whether restoration of these two anaerobic bacteria could attenuate the development of colitis in mice. In this study, L. johnsonii and B. thetaiotaomicron interacted directly with Candida species and induced a degradation of the fungal cell wall, mediated via chitinase-like and mannosidase-like activities, which promoted the inhibition of Candida species growth. In the DSS-induced colitis model, oral administration of L. johnsonii and B. thetaiotaomicron to mice reduced the overgrowth of Escherichia coli, Enterococcus faecalis and Candida glabrata populations and resulted in a significant reduction in inflammatory parameters. L. johnsonii and B. thetaiotaomicron decreased pro-inflammatory mediators and enhanced the anti-inflammatory cytokine response with high TLR9 expression and chitinase-like protein-1 activation, which promoted the elimination of C. glabrata from the gut. Overall, these findings provide evidence that L. johnsonii and B. thetaiotaomicron decrease the development of colitis mediated by TLR9 and promote the elimination of C. glabrata from the gut via chitinase-like and mannosidase-like activities.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus johnsonii LJ09Elimination of Candida glabrataBeneficial
Large
Lactobacillus johnsonii LJ09Reduced Colitis DevelopmentBeneficial
Large
Lactobacillus johnsonii LJ09Reduced Inflammatory ParametersBeneficial
Large
Lactobacillus johnsonii LJ09Reduced Pathogen GrowthBeneficial
Large
Lactobacillus johnsonii LJ09Reduced Pro-Inflammatory Mediator ProductionBeneficial
Large
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