金钗石斛多糖调控炎性小体NLRP3对非酒精性脂肪肝大鼠的保护作用

Protective Effects of Dendrobium Nobile Polysaccharide on NLRP3 in Rats with Nonalcoholic Fatty Liver Disease

目的:研究金钗石斛多糖对NAFLD大鼠的干预作用,并从NLRP3信号通路分析作用机制。方法:将72只SD大鼠分为正常、模型、金钗石斛多糖高、中、低剂量和多烯磷脂酰胆碱干预组,除正常组外,NAFLD模型构建成功治疗4周后处死,取出肝脏检测肝脏病理学和NLRP3、Caspase-1蛋白及mRNA表达,收集血液检测谷草转氨酶(AST)、谷丙转氨酶(ALT)、三酰甘油(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、白细胞介素-1β(IL-1β)和白细胞介素-18(IL-18)含量。结果:正常组肝小叶清晰,细胞核分布均匀,模型组有明显脂肪空泡和炎症反应浸润,金钗石斛多糖与多烯磷脂酰胆碱组明显改善;与正常组比较,模型组AST、ALT、TG、TC、HDL-C、LDL-C、IL-1β、IL-18、Caspase-1和NLRP3蛋白及mRNA均升高(P<0.05),与模型组比较,金钗石斛多糖组和多烯磷脂酰胆碱组上述指标均降低(P<0.05),此外金钗石斛多糖组与多烯磷脂酰胆碱组AST、ALT和HDL-C没有差异,高剂量组TG、TC和LDL-C低于多烯磷脂酰胆碱组(P<0.05),中和高剂量组IL-1β、IL-18、Caspase-1和NLRP3蛋白及mRNA明显低于多烯磷脂酰胆碱组(P<0.05)。结论:金钗石斛多糖可明显改善高脂高糖饮食诱导的NAFLD大鼠肝功能和血脂,这与其可调节炎性小体NLRP3,进而降低炎症反应有关。

Objective:To investigate the intervention effect of Dendrobium nobile polysaccharides on NAFLD rats,and to analyze the mechanism of action from the NLRP3 signaling pathway.Methods:A total of 72 SD rats were divided into 6 groups,which were the normal,model,high dose,medium dose,low dose Dendrobium nobile polysaccharide,and the polyene phosphatidylcholine intervention group.Except for the normal group,the other 5 groups were constructed an animal model of NAFLD and after treatment,the rats were sacrificed.Their liver was taken out to detect liver pathology and NLRP3,Caspase-1 protein and mRNA expression.Their blood was also collected to detect the AST,ALT,TG,TC,LDL-C,HDL-C,IL-1βand IL-18.Results:The liver lobules in the normal group were clear,and the nuclei were evenly distributed.The model group had obvious fatty vacuoles and inflammatory reaction infiltration.The Dendrobium nobile polysaccharide and polyene phosphatidylcholine group improved significantly.Compared with the control group,AST,ALT,TG,TC,HDL-C,LDL-C,IL-1β,IL-18,Caspase-1 and NLRP3 protein and mRNA were significantly increased in the model group(P<0.05).Compared with the model group,those indexes in the Dendrobium nobile polysaccharide and the polyene phosphatidylcholine group were significantly lower(P<0.05).In addition,there was no difference in AST,ALT and HDL-C between the Dendrobium nobile polysaccharide group and the polyene phosphatidylcholine group.TG,TC and LDL-C of the high-dose group were lower than those of the polyene phosphatidylcholine group(P<0.05).The protein and mRNA of IL-1β,IL-18,Caspase-1 and NLRP3 in the high-dose group were significantly lower than those in the polyene phosphatidylcholine group(P<0.05).Conclusion:Dendrobium nobile polysaccharides can significantly improve the liver function and blood lipids of NAFLD rats induced by a high-fat and high-sugar diet,which is related to its ability to regulate the inflammasome NLRP3,thereby reducing the inflammatory response.