Work

Lactobacillus paragasseri LG‐1 Alleviates Urticaria‐Like Symptoms in Mice via Modulation of Gut Microbiota, Hypoxanthine and Uric Acid

Year: 2026

Type: article

Abstract: Chronic Spontaneous Urticaria (CSU) is an immunoinflammatory disorder with complex pathogenesis. Emerging evidence implicates that gut microbiota dysbiosis plays a pivotal role in this pathological network. Integrated 16S rRNA sequencing and untargeted metabolomics revealed distinct CSU-associated signatures, including significant reductions in Lactobacillus abundance and elevated serum uric acid (UA) and hypoxanthine levels. Functional screening identified Lactobacillus paragasseri LG-1 from breast milk as a potent purine-metabolising strain, demonstrating significant hypoxanthine and UA degradation in vitro. In an ovalbumin (OVA)-induced urticaria murine model, LG-1 administration demonstrated marked reductions in serum UA and hypoxanthine concentrations, alleviated clinical manifestations, and suppressed inflammation via TLR4-NF-κB pathway inhibition. Moreover, it modulated gut microbial composition by promoting Lactobacillus proliferation while restraining pathogenic bacteria. These findings collectively established that LG-1 exerted dual therapeutic effects through uric acid/hypoxanthine degradation and microbiome remodelling. Our study provides compelling evidence for microbiome-targeted strategies in CSU management, highlighting LG-1 as a promising therapeutic candidate.

Source: Microbial Biotechnology

DOI: 10.1111/1751-7915.70316