黄芪多糖对铜绿假单胞菌致大鼠肺部感染的作用分析

目的分析黄芪多糖(astragalus polysaccharide, APS)对铜绿假单胞菌所致大鼠肺部感染的保护作用。 方法经气管内注射铜绿假单胞菌制备肺部感染模型，将40只SD雄性大鼠随机分为对照组(Control)、模型组(Model)及APS治疗组(模型+100 mg/kg APS(Model+APS100)及模型+200 mg/kg APS(Model+APS200)组)。造模后24 h处死大鼠，测定肺组织湿干重比(W/D)，分别计数及ELISA测定支气管肺泡灌洗液的总炎症细胞数及TNF-α、IL-1β水平，使用Western blot法检测肺组织中NF-κB p65及IκBα蛋白磷酸化水平。 结果与Control组相比，铜绿假单胞菌显著诱导肺组织W/D增加(P<0.05)，增加炎症细胞数(P<0.05)，使TNF-α、IL-1β表达(P<0.05)，并可诱导NF-κB p65/ IκBα发生磷酸化(P<0.05)，而给予APS治疗可明显逆转上述变化(P<0.05)，且高剂量组作用明显强于低剂量组(P<0.05)。 结论APS可能通过抑制p65/ IκBα活性，减少TNF-α及IL-1β的产生，从而减轻铜绿假单胞菌引起的肺部感染。

Effect of astragalus polysaccharide on pulmonary infection induced by Pseudomonas aeruginosa in rats

ObjectiveTo investigate the protective effects of astragalus polysaccharide (APS) on Pseudomonas aeruginosa induced pulmonary infection in rats. MethodsForty male SD rats were randomly divided into Control group, Model group and APS treatment group (Model+ 100 mg/kg APS (Model+ APS100) and Model+ 200 mg/kg APS (Model+ APS200). The rats were killed 24 hours after the model established. The wet/dry weight ratio (W/D ratio) of the lung tissue was measured. The number of total inflammatory cells and the levels of TNF-α and IL-1β in the bronchoalveolar lavage fluid were counted and measured by ELISA, respectively. The phosphorylation levels of p65 and IκBα protein in the lung tissue was measured by Western blot. ResultsCompared with Control group, Pseudomonas aeruginosa significantly increased the W/D ratio of lung tissues (P<0.05), the number of inflammatory cells (P<0.05), the expression of TNF-α and IL-1 β (all P<0.05), and the phosphorylation of NF-κB p65/IκBα (all P<0.05). While APS treatment could significantly reverse the above changes (all P<0.05), and the effects of high dose APS was significantly stronger than that of low dose APS (all P<0.05). ConclusionIt is effective for APS in treatment of lung infectious disease induced by Pseudomonas aeruginosa by inhibiting the activity of NF-κB p65/IκBα and reducing the production of TNF-α and IL-1β.