RESUMO
Objective:To explore the effect and mechanism of esculentoside on lipopolysaccharide-induced mastitis in mice. Method:Female BALB/c mice were randomly divided into control group, model group, dexamethasone group (DEX, 5.0 mg·kg-1) and esculentoside group (50, 25, 12.5 mg·kg-1). The mastitis model of postpartum female mice (BALB/c) induced by lipopolysaccharide (LPS) was used to analyze the pathological conditions of breast tissue and the activity of recombinant myeloperoxidase（MPO）, factor content and oxidative stress level. Western blot was used to evaluate the effect of esculentoside on Toll-like receptor4 (TLR4)/nuclear transcription factor (NF-κB) signaling pathway proteins. Result:Compared with the normal group, the breast tissue of the model group had typical mastitis changes, such as hyperemia and congestion, the level of MPO increased, and the expression levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) and interleukin-6 (IL-6) increased significantly (P<0.01). Compared with LPS model group, esculentoside groups could significantly improve the inflammatory damage of mammary gland tissue, reduce the secretion of neutrophils and the activity of MPO, the expression levels of pro-inflammatory factors TNF-α, IL-1β and IL-6 were also significantly down-regulated, the activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) were increased, while the level of malondialdehyde (MDA) was decreased, and the activation of TLR4/NF-κB signaling pathway was inhibited by esculentoside（P<0.05，P<0.01）. Conclusion:Esculentoside have a protective effect on lipopolysaccharide-induced mastitis in mice, which may be related to the inhibition of TLR4/NF-κB signaling pathway protein expression.
