ArticleGut microbes2026
Targeted intestinal ROS scavenging alleviated rheumatoid arthritis by microbial metabolite kynurenic acid mediated Treg/Th17 balance through AhR pathway activation.
Article in Gut microbes, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune disorder characterized by immune dysregulation, which is often closely related to impaired gut microbiota homeostasis. Excessive reactive oxygen species (ROS) are recognized as critical drivers of microecological immunity disturbance, contributing directly to the inflammatory cascade. However, the underlying mechanism remains unclear. Here, we have used ROS scavengers to alleviate RA progression via inhibiting intestinal ROS and modulating gut microbial kynurenic acid metabolism. Black phosphorus nanosheets (BPNSs), as effective ROS scavengers, significantly ameliorated disease severity in collagen-induced arthritis (CIA) mice by oral administration to eliminate intestinal excess ROS. BPNSs selectively reshaped the gut microbiota and altered its metabolic profile, elevating the relative abundance of the tryptophan-derived metabolite kynurenic acid (KYNA). Mechanistically, elevated KYNA activated the aryl hydrocarbon receptor (AhR) pathway in naïve CD4
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