[关键词]
[摘要]
【目的】 基于 Sirtuin 1(SIRT1)/转录因子 1(FOXO1)信号通路,探究参附注射液减轻脓毒症大鼠急性肺损伤的分子机 制。【方法】 将SD大鼠随机分为假手术组(8只)、模型组(16只)、阳性药物(地塞米松)组(12只)、参附注射液组(12只)、参 附注射液+SIRT1抑制剂(EX527)组(12只)。除假手术组,其他各组大鼠通过盲肠结扎穿孔术构建脓毒症模型。统计各组大 鼠每天的死亡数量并绘制生存曲线图,测定各组大鼠的肺组织含水率,苏木精-伊红(HE)染色法观察肺组织的病理学损伤, Western Blot法检测肺组织中微管相关蛋白轻链3(LC3)、Beclin-1、p62、SIRT1、FOXO1蛋白的表达,微量法检测肺组织中 超氧化物歧化酶(SOD)和丙二醛(MDA)水平,实时定量聚合酶链反应(RT-qPCR)法检测肺组织中 SIRT1、FOXO1 mRNA 的表达。【结果】 与假手术组比较,模型组大鼠的生存率降低(P<0.05),肺组织含水率升高(P<0.05),肺组织呈现显著病 理学损伤,肺组织中LC3Ⅱ/Ⅰ比值、Beclin-1蛋白表达水平、SOD水平、SIRT1 mRNA及蛋白表达水平降低(P<0.05),肺组 织中p62蛋白表达水平、MDA水平、FOXO1 mRNA及蛋白表达水平增加(P<0.05);与模型组比较,阳性药物组、参附注射 液组大鼠肺组织含水率降低(P<0.05),肺组织的病理学损伤减轻,肺组织中 LC3Ⅱ/Ⅰ比值、Beclin-1蛋白表达水平、SOD 水平、SIRT1 mRNA及蛋白表达水平增加(P<0.05),肺组织中 p62蛋白表达水平、MDA水平、FOXO1 mRNA及蛋白表达水 平降低(P<0.05);SIRT1抑制剂EX527能在一定程度上抑制参附注射液对脓毒症大鼠的调控作用(P<0.05)。【结论】 参附注 射液能够通过促进自噬、抑制氧化应激减轻脓毒症大鼠急性肺损伤,其机制可能与调控SIRT1/FOXO1信号通路相关。
[Key word]
[Abstract]
Objective To investigate the molecular mechanism by which Shenfu Injection alleviates acute lung injury in septic rats, based on the Sirtuin 1(SIRT1)/Forkhead box protein O1(FoxO1) signaling pathway. Methods SD rats were randomly divided into a sham-operated group (n=8),a model group (n=16),a positive control (dexamethasone) group (n=12),a Shenfu Injection group (n=12),and a Shenfu Injection + EX527(a SIRT1 inhibitor) group (n=12). Except for the sham-operated group,a sepsis model was established in all other groups via cecal ligation and puncture (CLP). The number of daily deaths in each group was recorded and a survival curve was plotted. The lung wet/dry weight ratio was measured. Pathological damage to lung tissue was assessed by hematoxylin-eosin (HE) staining. Protein expression levels of microtubule-associated protein 1 light chain 3(LC3),Beclin-1,p62,SIRT1,and FOXO1 in lung tissue were detected by Western Blot. Levels of superoxide dismutase (SOD) and malondialdehyde (MDA) in lung tissue were measured using micro-methods.The mRNA expression of SIRT1 and FOXO1 in lung tissue was determined by real-time quantitative polymerase chain reaction (RT-qPCR). Results Compared with the sham-operated group, the model group showed a significantly decreased survival rate (P<0.05),an increased lung wet/dry ratio (P<0.05),marked pathological damage in lung tissue,decreased LC3 II/I ratio,Beclin-1 protein expression,SOD activity,and SIRT1 mRNA and protein levels (P<0.05),alongside increased p62 protein expression,MDA level,and FOXO1 mRNA and protein levels in lung tissue (P<0.05). Compared with the model group,both the positive control (dexamethasone) group and the Shenfu Injection group exhibited a reduced lung wet/dry ratio (P<0.05),alleviated pathological lung damage, increased LC3 II/I ratio, Beclin-1 protein expression, SOD activity, and SIRT1 mRNA and protein levels (P<0.05), alongside decreased p62 protein expression, MDA level, and FOXO1 mRNA and protein levels in lung tissue (P<0.05). The SIRT1 inhibitor EX527 partially reversed the regulation effects of Shenfu Injection in septic rats (P<0.05). Conclusion Shenfu Injection can alleviate actue lung injury in septic rats by promoting autophagy and inhibiting oxidative stress,and its mechanism may be associated with the modulation of the SIRT1/FOXO1 signaling pathway.
[中图分类号]
R285.5
[基金项目]
广东省中医药局科研项目(编号:20231252);广州市花都区基础与应用基础研究区院联合资助项目(编号:24HDQYLH26)