AI Insight
This study reveals that archaea, the third domain of life present in the human gut, play a significant role in activating MAIT cells, important immune cells that detect microbial metabolites. Researchers found strong correlations between archaeal riboflavin biosynthesis and MAIT cell frequency across diverse populations, and demonstrated that methanogenic archaea like Methanobrevibacter smithii produce the key antigen 5-OP-RU that activates these immune cells without causing inflammation. The findings establish archaea as important modulators of human immune function through their metabolic activities.
Why it matters
This discovery expands understanding of how the human microbiome regulates immunity beyond bacteria, potentially opening new therapeutic approaches for immune-related conditions. Understanding archaeal contributions to immune activation could inform microbiome-based interventions for diseases involving MAIT cell dysfunction, including inflammatory bowel disease, metabolic disorders, and infections.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Archaea, the third domain of life, are a gut microbiome constituent, but their role in shaping immunity is poorly understood. Mucosal-associated invariant T (MAIT) cells sense microbial metabolites through their T cell receptor and contribute to antimicrobial defence and barrier homeostasis. Key sources of the major MAIT cell antigen 5-OP-RU within the human gut microbiome are unknown. Analysing microbiomes from UK, Zambian, Kenyan and Ugandan donors, we found strong correlations between archaeal riboflavin biosynthesis and circulating MAIT cell frequency and activation. Stool 5-OP-RU levels correlated with archaeal abundance. Cultures of methanogenic archaea, including the human commensal Methanobrevibacter smithii, produced 5-OP-RU and strongly activated MAIT cells without inflammation. We demonstrate a critical role for archaea in shaping human immunity, with implications for microbiome-mediated regulation of health.