Gut microbiota-derived LCA mediates the protective effect of PEDV infection in pigletsOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study investigated how the gut microbiota influences differential host resistance to porcine epidemic diarrhea virus (PEDV) infection in piglets. Researchers combined single-cell transcriptomics, 16S amplicon sequencing, metagenomics, and untargeted metabolomics to characterize the microbial and metabolic changes that follow PEDV infection. The work focused on identifying specific bacterial species and their metabolites that mediate protection against this pathogen.
Who was studied?
The study used Landrace and Min pig breeds, two breeds with differing natural resistance to PEDV infection. Landrace pigs, which lose resistance quickly after infection, received fecal microbiota transplants from Min pigs, which are comparatively resistant. Animal protection models were then used to test the effects of specific bacteria and metabolites identified through the multi-omics analysis.
What were the most important findings?
PEDV infection caused significant changes in the gut microbiota of piglets, and transplanting fecal microbiota from resistant Min pigs into susceptible Landrace pigs alleviated the infection. Metagenomic and animal protection models identified Lactobacillus reuteri and Lactobacillus amylovorus as playing an anti-infective role. Metabolomic screening linked these bacteria to the secondary bile acids deoxycholic acid (DCA) and lithocithocholic acid (LCA), but only LCA showed a protective effect in the animal model, and LCA supplementation altered the distribution of intestinal T-cell populations, notably enriching CD8+ populations.
What are the greatest implications of this study?
These findings identify lithocholic acid as a key gut microbiota-derived metabolite mediating protection against PEDV infection in piglets. The results point to Lactobacillus reuteri and Lactobacillus amylovorus as candidate probiotic strains that could be harnessed to boost disease resistance through bile acid metabolism. This work suggests that modulating the gut microbiota and its bile acid metabolites, particularly LCA, and their effects on intestinal T-cell populations, could be a strategy for improving resistance to enteric viral pathogens in livestock.