Soil-derived microbiota induces T regulatory cells and protect against mouse colitis, metabolic disease, and sepsis

Summary

This preclinical study developed a scalable model in which soil-derived environmental microbiota were allowed to colonise laboratory mice, shifting their microbiome composition toward conditions more representative of natural exposures. Sustained colonisation with environmental microbes, particularly Gram-negative bacteria, induced local and systemic anti-inflammatory immune responses characterised by expanded regulatory T cell and IL-10+ populations. These immune shifts conferred protection against multiple inflammatory and metabolic pathologies including colitis, obesity, diabetes, and sepsis, with apparent benefits to longevity.

Regional applicability

This is a fundamental preclinical mouse model study conducted in the United States and designed to improve the translational relevance of laboratory animal research. Whilst the findings suggest value in considering natural microbial exposures for human health, direct application to United Kingdom agricultural or clinical practice would require human trials and consideration of how soil microbiota exposure might be integrated into farming systems or human dietary/environmental interventions.

Key measures

Regulatory T cell (Treg) expansion, IL-10+ innate and adaptive immune populations, colitis incidence and severity, obesity and diabetes measures, sepsis survival, health span, lifespan

Outcomes reported

The study measured immune responses (Treg and IL-10+ populations) and disease protection in mice colonised with soil-derived microbiota. Outcomes included resistance to colitis, obesity, diabetes, and sepsis, alongside effects on health span and lifespan.

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