Ginsenoside Rg1 alleviates ochratoxin A-induced liver inflammation in ducklings: Involvement of intestinal microbiota modulation and the TLR4/NF-κB pathway inhibition

Abstract

Ochratoxin A (OTA) is a toxic fungal secondary metabolite that triggers liver inflammation in animals. OTA could disrupt intestinal microbiota balance by promoting Gram-negative bacteria growth and activating the Toll-like receptor 4 (TLR4)/Nuclear factor-kappa B (NF-κB) signaling pathway, thereby inducing liver inflammation. Ginsenoside Rg1 (Rg1) is an active component of ginseng, exhibits anti-inflammatory, antibacterial, and antioxidative properties, particularly against gram-negative bacteria. Rg1 has been shown to maintain intestinal microbiota homeostasis and inhibit the TLR4 signaling pathway to alleviate liver inflammation. Given these established mechanisms, the aim of this study was to explore the preventive effect of Rg1 in countering OTA-induced liver inflammation through modulation of intestinal microbiota and the TLR4/NF-κB signaling pathway. The results revealed that Rg1 reduced OTA residues in the cecum and enhanced intestinal barrier function. Moreover, Rg1 ameliorated the intestinal microbiota composition in OTA-treated ducklings by decreasing the relative abundance of lipopolysaccharide (LPS)-related bacteria. Rg1 also increases the abundance of short-chain fatty acid (SCFA)-producing bacteria. Additionally, Rg1 supplementation with OTA decreased the accumulation of LPS in tissues and inhibited the TLR4/NF-κB signaling pathway. Intriguingly, Rg1 maintained its beneficial effects in OTA-treated ducklings even after antibiotic treatment by inhibiting the TLR4/NF-κB pathway. These findings emphasized the importance of intestinal microbiota homeostasis and TLR4/NF-κB pathway suppression in the anti-inflammatory action of Rg1 during OTA-induced liver inflammation.