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Nettle (Urtica cannabina L.) polysaccharides as a novel dietary supplement: enhancing systemic antioxidant status via modulation of the gut–liver axis

文献类型： 外文期刊

作者： 张继泽;;张千;;张晓庆;;乔江;;王敬炜;;高阳;;董平

关键词： Urtica cannabina L.; polysaccharides; antioxidant; gut–liver axis; gut microbiota; serum metabolites

期刊名称： Frontiers in Pharmacology

ISSN：

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Background: Nettle (Urtica cannabina L.) is a promising traditional food source with great potential in the expanding functional foods market; however, the bioactive potential of its polysaccharides, a major component, remains underexplored as a functional food ingredient. This study evaluated the effects of U. cannabina polysaccharides (UP) on gut microbiota modulation and systemic antioxidant activity in healthy mice. Methods: Mice were fed a basal diet or diets supplemented with low (300 mg/kg) (UPL) and high (600 mg/kg) (UPH) doses of UP for 28 days. Results: Our findings revealed that UP supplementation, particularly at low doses, significantly improved growth performance (P < 0.05), serum lipid profiles (P < 0.05), and hepatic and serum antioxidant capacity without inducing liver damage. Notably, UPL treatment reduced malondialdehyde (MDA) levels (P < 0.01) and enhanced the activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), catalase (CAT), and total antioxidant capacity (T-AOC) (P < 0.05). Sequencing of 16S rRNA indicated that UP supplementation altered gut microbiota composition, particularly by increasing the relative abundance of beneficial genera such as Parabacteroides (P = 0.0973) and Dubosiella (P = 0.0648) in the UPL group, which were positively correlated with antioxidant biomarkers. Moreover, UPL treatment elevated levels of short-chain fatty acids (SCFAs), especially acetate and butyrate (P < 0.05). Untargeted metabolomics demonstrated that UPL treatment influenced serum metabolic profiles and enriched the bile acid (BA) secretion pathway, with notable increases in deoxycholic and taurocholic acid, suggesting a potential link between gut microbiota, BA metabolism, and host antioxidant status. Conclusion: These findings indicate that UP could serve as a safe and effective functional dietary supplement capable of improving antioxidant function through gut microbiota modulation and gut–liver axis signaling.

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