The Influence of Innate Immunity, Adaptive Immunity and Diet on Intestinal Microbiota Following Trichuris muris...

Area of Science:

• Immunology
• Microbiology
• Nutritional Science

Background:

• Trichuris trichiura infection affects millions globally, causing significant health issues, especially in children.
• Host immunity is crucial for clearing Trichuris infections, but diet and gut microbiota also play modulating roles.

Purpose of the Study:

• To investigate the interplay between immune competence and diet in influencing helminth infection outcomes.
• To examine how normal diet (ND) versus high-fat diet (HFD) affects worm burden, antibody responses, and gut microbiota composition in different immune-deficient mouse models.

Main Methods:

• Utilized a Trichuris muris mouse model with varying immune deficiencies (wild-type, RAG1-deficient, RAG1/γc-deficient).
• Mice were fed either a normal diet (ND) or a high-fat diet (HFD) before and during infection.
• Assessed worm burden, host antibody responses (IgG2a/c, IgG1), and gut microbiota composition.

Main Results:

• Wild-type mice on HFD showed near-complete parasite clearance with a shift towards Th2-biased immunity (elevated IgG1).
• Immune-deficient mice on HFD exhibited reduced worm burdens, indicating immune-independent parasite control.
• Gut microbiota composition varied significantly based on diet and host genotype, with HFD enriching specific bacterial genera.

Conclusions:

• Diet and immune status synergistically regulate susceptibility to helminth infections.
• High-fat diets can enhance parasite control, potentially via immune-independent mechanisms involving microbiota modulation.
• Findings highlight the interconnected roles of host immunity, diet, and the gut microbiome in helminth infection dynamics.