#1-96E. Beyond the Leaky Gut: Deconstructing the Gut-Joint Axis in Arthritis (Nature Reviews Rheumatology, 2025)

How exactly does the gut microbiome influence the development of rheumatoid arthritis and spondyloarthritis? While the "leaky gut" hypothesis is popular, a 2025 review in Nature Reviews Rheumatology argues this is an oversimplification and explores the gut-joint axis with greater nuance1. The authors synthesize evidence for multiple mechanisms beyond simple permeability, including molecular mimicry, microbial translocation, the production of immunomodulatory metabolites, and the trafficking of gut-primed immune cells. The core clinical takeaway is that increased intestinal permeability (paracellular transport) and bacterial translocation (transcellular transport) are distinct phenomena that should not be equated. Critically, much of the causal evidence is derived from animal models, and translating these specific mechanisms to human disease remains a significant challenge requiring further interventional studies. For clinicians, this paper is vital as it reframes our understanding of the gut's role in arthritis, highlighting potential new therapeutic targets and encouraging a more critical appraisal of permeability biomarkers like circulating zonulin in clinical practice.

Citation: KUHN, Kristine A., et al. More than a leaky gut: how gut priming shapes arthritis. Nature Reviews Rheumatology. 2025. DOI: https://doi.org/10.1038/s41584-025-01282-1

Disclaimer: This audio summary is based on personal interpretation and does not guarantee the exact content of the original paper. Please refer to the original article for details.