Efficacy and mechanism of Wuzi Yanzong pill on the prevention and treatment of EAE

OBJECTIVE: Studies have shown that Wuzi Yanzong Pill (WYP) can be used to treat neurological diseases, but its mechanisms for multiple sclerosis (MS) remain unclear. This study aims to determine the effect of WYP on MS in an animal model of experimental autoimmune encephalomyelitis (EAE), and explore its mechanism. To provide theoretical basis for the clinical treatment of MS with WYP. METHODS: C57BL/6 female mice were randomly divided into Blank control, EAE control, low dose WYP, medium dose WYP, and high dose WYP groups. One week before model generation, the mice were gavaged with saline (50 mL/kg/d) in Blank control and EAE control groups. The treatment groups was gavaged with different doses of WYP solution (4, 8, or 16 g/kg/d respectively) Clinical scores were recorded daily. Sample collection was conducted on the 14th and 28th days, respectively The expressions of IL-10, IL-17, IL-12, TNF-α and IFN-γ in spleen were detected by ELISA. The expressions of ROCKII, P-MYPT1, TLR4, NF-κB/p65, MCP-1, CCR2 in spleen, brain and spinal cord were detected by Western Blot. The types of macrophages and the contents of intracellular IL-10 and IL-12 were detected by Flow Cytometry. The contents of TNF-α and TLR4 mRNA in the spleen were detected by RT-PCR. RESULTS: WYP treatment improved the clinical score of EAE mice in a significant dose-dependent manner, with the WYP high-dose group showed the most significant improvement in clinical score. Compared with the EAE control group, WYP high dose group had significantly lower levels of IL-17, IFN-γ, ROCKII, P-MYPT1, TLR4, NF-κB/p65, MCP-1, and CCR2 as well as TNF-α and TLR4 mRNA, but increased the number of M(2) macrophages and IL-10. CONCLUSION: WYP treatment relieves clinical symptoms in EAE mice, which may be related to regulate inflammatory pathway and inhibiting expressions of inflammatory cytokines.