连翘苷调节NLRP3炎性通路对急性胸膜炎大鼠肺损伤的影响

Effect of phillyrin regulating NLRP3 inflammatory pathway on exudates and lung injury in rats with acute pleurisy

目的探讨连翘苷通过调节NOD样受体热蛋白结构域相关蛋白3(NLRP3)炎性通路对急性胸膜炎大鼠渗出液和肺损伤的影响。方法将90只大鼠采用随机数字表法均分为对照组、模型组、连翘苷低剂量(PH-L,5 mg/kg)组、连翘苷中剂量(PH-M,10 mg/kg)组、连翘苷高剂量(PH-H,20 mg/kg)组及NLRP3通路抑制剂(PJ34,10 mg/kg)组。肺功能分析仪检测大鼠用力肺活量(FVC)、第0.1秒用力呼气量(FEV 0.1)、第0.3秒用力呼气量(FEV 0.3);电子天平称量胸腔渗出物质量;瑞氏染色检测渗出物白细胞数;酶联免疫吸附试验检测渗出液中前列腺素E2(PGE2)、单核细胞趋化蛋白-1(MCP-1)、白细胞介素(IL)-6、肿瘤坏死因子-α(TNF-α)含量;全自动血气分析仪检测大鼠动脉CO_(2)分压[p(CO_(2))]、动脉氧分压[p(O_(2))];HE染色观察肺组织病理学变化;免疫组织化学染色检测NOD样受体热蛋白结构域相关蛋白3(NLRP3)、胱天蛋白酶1(Caspase-1)蛋白表达;Western blot检测NLRP3通路蛋白表达。结果与对照组比较,模型组大鼠胸腔渗出物质量和白细胞数、渗出液PGE2、MCP-1、IL-6、TNF-α含量、p(CO_(2))、NLRP3通路蛋白表达增加,FVC、FEV 0.1、FEV 0.3、p(O_(2))降低,肺组织出现明显的病理损伤(P<0.05);与模型组比较,PH各组和PJ34组大鼠胸腔渗出物质量、白细胞数、渗出液PGE2、MCP-1、IL-6、TNF-α含量、p(CO_(2))、NLRP3通路蛋白表达降低,FVC、FEV 0.1、FEV 0.3、p(O_(2))增加,肺组织病理损伤好转(P<0.05);与PH-H组比较,PJ34组上述指标差异无统计学意义(P>0.05)。结论PH可通过抑制NLRP3通路激活,抑制炎症反应,改善急性胸膜炎引起的肺损伤。

Objective To investigate the impacts of phillyrin on exudates and lung injury in rats with acute pleurisy by regulating the NLRP3 inflammatory pathway.Methods Ninety rats were randomly divided into the control group,the model group,the low-dose phillyrin(PH-L,5 mg/kg)group,the medium-dose phillyrin(PH-M,10 mg/kg)group,the high-dose phillyrin(PH-H,20 mg/kg)group and the NLRP3 pathway inhibitor(PJ34,10 mg/kg)group.FVC,FEV 0.1 and FEV 0.3 were detected by lung function analyzer.Electronic balance was used to weigh the mass of chest exudate.The number of white blood cells in exudate was detected by Wright staining.Contents of prostaglandin E2(PGE2),monocyte chemoattractant protein-1(MCP-1),interleukin(IL)-6 and tumor necrosis factor-α(TNF-α)in exudate were detected by ELISA.Automatic blood gas analyzer was used to detect p(CO_(2))and p(O_(2))of rats.HE staining was used to observe pathological changes of lung tissue.The expression levels of NLRP3 and Caspase-1 protein were detected by immunohistochemistry.Western blot assay was used to detect the expression of NLRP3 pathway protein.Results Compared with the control group,the quality of pleural exudate and the number of white blood cells,the contents of PGE2,MCP-1,IL-6,TNF-α,the expression of p(CO_(2))and NLRP3 pathway proteins in exudate of the model group increased obviously,FVC,FEV 0.1,FEV 0.3 and p(O_(2))decreased obviously,and the lung tissue showed obvious pathological damage(P<0.05).Compared with the model group,the quality of pleural exudate and the number of white blood cells,the contents of PGE2,MCP-1,IL-6,TNF-α,the expression of p(CO_(2)),NLRP3 pathway proteins in the exudate of rats decreased obviously in the PH group and the PJ34 group,FVC,FEV 0.1,FEV 0.3 and p(O_(2))increased obviously,the pathological injury of lung tissue was obviously improved(P<0.05).Compared with the PH-H group,there were no significant differences in the above indexes in the PJ34 group(P>0.05).Conclusion PH can improve lung injury induced by acute pleurisy in rats by inhibiting the activation of NLRP3 pathway and inhibiting inflammatory reaction.