Removal of adult cyathostomins alters faecal microbiota and promotes an inflammatory phenotype in horses.

This research investigates how treating horses for parasitic worms, specifically cyathostomins, affects the gut microbiota and causes increased inflammation. Researchers found that administering anthelmintic drugs resulted in a temporary decrease in gut bacteria diversity, changes in the bacterial makeup and increase in inflammation indicators.

Introduction

The study delves into the relationship between parasitic helminths (worms) and gut microbiota (the range of microorganisms in the digestive system), which plays a significant role in determining a host’s immune response, inflammation, and susceptibility to certain diseases. Particularly, the researchers explore this dynamic in horses, which are commonly infected with a type of intestinal helminth known as cyathostomins.

Approach

• The researchers examined the effect that different anthelmintic treatments, fenbendazole and moxidectin, had on the gut bacteria and the immune response in horses.
• They sought to understand more about the impact of parasitic worm population changes, or its “helminthome,” in the gastrointestinal system and its relationship to inflammation and disease, including a condition known as acute larval cyathostominosis.
• Two groups of horses were analyzed post-treatment to measure changes in their faecal microbiota. Diversity of these microorganisms were measured on Day 7 and Day 14 after treatment.

Results

• A decrease in both alpha diversity (variety of species in a specific community) and beta diversity (variation in microbial communities between different environments) of the gut microbiota was observed at Day 7 post-treatment. However, this effect reversed by Day 14.
• The decrease in gut biodiversity was concurrent with increases in inflammatory biomarkers, indicating some form of inflammatory response.
• The pattern of faecal microbiota observed during the study generally aligned with other similar studies on the equine gut microbiome.

Conclusion

The research concludes that anthelmintic treatment, which disrupts cyathostomin populations, can lead to temporary gut microbiota changes and increased inflammatory responses in horses. This balance between parasitic helminths and gut bacteria appears to be crucial in maintaining gut health. Disturbances in this balance could potentially contribute to gut disorders and inflammatory conditions in horses. This includes the acute inflammatory syndrome known as acute larval cyathostominosis. Further research is needed to understand fully the mechanisms at play and implications for equine health.