[关键词]
[摘要]
目的 探讨血必净注射液通过 PTEN 诱导假定激酶 1(PINK1)/泛素蛋白连接酶(Parkin)线粒体自噬通路 抑制细胞焦亡抗急性肺损伤的作用机制。方法 将雄性 SD 大鼠随机分为正常组、模型组、血必净注射液低剂 量组、血必净注射液高剂量组和地塞米松磷酸钠注射液组,每组 10 只。采用腹腔注射脂多糖的方法复制急性 肺损伤大鼠模型,模型复制成功后各组腹腔注射相应药物,每天 1 次,连续干预 3 d。采用肺组织湿/干质量比 评估肺水肿程度;HE 染色观察肺组织炎症浸润和损伤情况并进行评分;ELISA 法检测血清炎性因子白细胞介 素(IL)-1β、IL-17、IL-18 和 IL-8 的含量;RT-qPCR 和 Western Blot 法检测肺组织 PINK1/Parkin 通路、线粒 体自噬相关蛋白 Bcl-2 适配分子 3 样蛋白(BNIP3L)和微管相关蛋白 1 轻链 3(LC3)、细胞焦亡相关蛋白 NOD 样 受体热蛋白结构域 3(NLRP3)、半胱氨酸天冬氨酸蛋白酶 1(Caspase-1)、消皮素 D(GSDMD)的 mRNA 和蛋白 表达水平。结果 与正常组比较,模型组大鼠肺组织湿/干质量比值明显升高(P<0.001),肺组织结构受损, 伴有大量炎性细胞浸润,肺组织病理评分升高(P<0.001);血清炎性因子 IL-1β、IL-17、IL-18 和 IL-8 的水平 升高(P<0.001);肺组织 PINK1、Parkin、BNIP3L、LC3、NLRP3、GSDMD 的 mRNA 和蛋白表达及 Caspase-1 的 mRNA 表达、Cle Caspase-1/Caspase-1 比值均明显升高(P<0.01,P<0.001)。与模型组比较,血必净注射液组 大鼠肺组织湿/干质量比值明显降低(P<0.01,P<0.001);肺组织损伤和炎性浸润情况明显改善,且肺组织病 理评分降低(P<0.01,P<0.001);炎性因子 IL-1β、IL-17、IL-18 和 IL-8 的水平降低(P<0.05,P<0.01, P<0.001);肺组织 PINK1、Parkin、BNIP3L、LC3、NLRP3、GSDMD 的 mRNA 和蛋白表达及 Caspase-1 的 mRNA 表达、Cle Caspase-1/Caspase-1 比值均明显降低(P<0.05,P<0.01,P<0.001)。结论 血必净注射液 可改善 ALI 大鼠的肺组织损伤和炎症反应,其机制可能与下调 PINK1/Parkin 线粒体自噬通路抑制细胞焦亡有关。
[Key word]
[Abstract]
Objective To investigate the mechanism of Xuebijing Injection (XBJ) in inhibiting pyroptosis against acute lung injury (ALI) through the PTEN-induced putative kinase 1(PINK1)/Parkin E3 ubiquitin protein ligase (Parkin) mitophagy pathway. Methods Male SD rats were randomly divided into normal group,model group,low-dose XBJ group,high-dose XBJ group,and dexamethasone sodium phosphate injection group,with 10 rats in each group. An ALI rat model was established by intraperitoneal injection of lipopolysaccharide. After successful model replication, drugs were administered intraperitoneally once daily for 3 consecutive days. The degree of pulmonary edema was assessed by measuring the wet/dry weight ratio of lung tissue. Hematoxylin-eosin (HE) staining was used to observe inflammatory infiltration and damage in lung tissue,and pathological scores were assigned. Serum levels of inflammatory factors interleukin (IL)-1β,IL-17,IL-18,and IL-8 were detected by ELISA. RT-qPCR and Western Blot were performed to measure the mRNA and protein expression levels of PINK1/Parkin pathway components, mitophagyrelated proteins BCL-2/adaptor molecule 3 like (BNIP3L) and microtubule-associated protein 1 light chain 3(LC3), and pyroptosis-related proteins NOD-like receptor family pyrin domain containing 3(NLRP3),cysteinyl aspartatespecific protease 1(Caspase-1),and gasdermin D (GSDMD) in lung tissue. Results Compared with the normal group, the model group showed a significant increase in the lung wet/dry weight ratio (P<0.001), damaged lung tissue structure with extensive inflammatory cell infiltration,elevated lung tissue pathological scores (P<0.001),increased serum levels of inflammatory factors IL-1β,IL-17,IL-18,and IL-8(P<0.001),and significantly elevated mRNA and protein levels of PINK1,Parkin,BNIP3L,LC3,NLRP3,and GSDMD,as well as mRNA levels of Caspase-1 and protein levels of Cle Caspase-1 in lung tissue (P<0.01,P<0.001). Compared with the model group,the XBJ groups exhibited a significant reduction in the lung wet/dry weight ratio (P<0.01,P<0.001),marked improvement in lung tissue damage and inflammatory infiltration, decreased lung tissue pathological scores (P<0.01, P<0.001), reduced levels of inflammatory factors IL-1β, IL-17, IL-18, and IL-8(P<0.05, P<0.01, P<0.001), and significantly decreased mRNA and protein levels of PINK1,Parkin,BNIP3L,LC3,NLRP3,and GSDMD,as well as mRNA levels of Caspase-1 and protein levels of Cle Caspase-1 in lung tissue (P<0.05, P<0.01, P<0.001). Conclusion Xuebijing Injection ameliorates lung tissue damage and inflammatory response in rats with ALI,and its mechanism may be related to the downregulation of the PINK1/Parkin mitophagy pathway and inhibition of pyroptosis.
[中图分类号]
R285.5
[基金项目]
国家自然科学基金青年项目(82505541);湖南省自然科学基金青年项目(2023JJ40595,2025JJ60802,2023JJ40593);湖南省教育厅 课题(24C0186);中国博士后科学基金第 75批面上项目(2024M731353)。