基于NLRP3/caspase-1/GSDMD信号通路探讨双硫仑改善HFpEF大鼠心功能的机制  

Role and mechanisms of disulfiram in improving cardiac function and reducing myocardial inflammation in HFpEF rats based on NLRP3/caspase-1/GSDMD signaling pathway

作　　者：沈玄洋 李卫东[1] 蒋晓路 张美琪 谭文涛 沈媛 文红福 SHEN Xuanyang;LI Weidong;JIANG Xiaolu;ZHANG Meiqi;TAN Wentao;WEN Hongfu;SHEN Yuan(Department of Emergency,Affiliated Hospital of North Sichuan Medical College,Nanchong 637000,China)

机构地区：[1]川北医学院附属医院急诊科,四川南充637000

出　　处：《中国病理生理杂志》2024年第10期1891-1897,共7页Chinese Journal of Pathophysiology

基　　金：四川省医学会科研项目(No.S22101);川北医学院附属医院博士科研启动基金(No.202002)。

摘　　要：目的:探讨双硫仑(DSF)在高脂饮食(HFD)和一氧化氮阻滞剂Nω-硝基-L-精氨酸甲酯(L-NAME诱导的射血分数保留的心力衰竭(HFpEF)大鼠模型中的作用及可能的机制。方法:通过HFD+L-NAME构建HFpEF大鼠模型;将SD大鼠随机分为三组:control组(给予正常饮食和水喂养)、HFpEF组(给予HFD和含0.5 g/L L-NAME的饮用水喂养)和DSF+HFpEF组(在HFD+L-NAME的基础上给予DSF治疗)。5周后,使用超声心动图和运动力竭实验检测心功能;苏木素-伊红和麦胚凝集素染色检测心肌病理改变;Masson染色检测心肌纤维化程度;TUNEL染色观察细胞凋亡水平;Western blot检测心肌中核苷酸结合寡聚化结构域样受体蛋白3(NLRP3)、cleaved caspase-1和消皮素D的N端片段(GSDMD-N)蛋白水平;ELISA检测血清N末端脑利尿钠肽前体(NT-proBNP)水平及心肌中白细胞介素1β(IL-1β)和IL-18含量。结果:与control组相比,HFpEF组大鼠体重、收缩压、舒张压、E/E'比值、舒张期左心室前壁厚度(LVAWd)和血清NT-proBNP水平均显著升高(P<0.05),E/A比值和整体纵向应变(GLS)绝对值均显著降低(P<0.05);与HFpEF组相比,DSF+HFpEF组大鼠体重、E/E'比值、舒张压和血清NTproBNP水平均显著降低(P<0.05),E/A比值和GLS绝对值显著升高(P<0.05),收缩压、舒张期左心室后壁厚度(LVPWd)和左心室射血分数(LVEF)无显著改变(P>0.05)。与control组相比,HFpEF组大鼠心肌纤维化面积、心肌细胞横截面积和凋亡率均显著升高(P<0.05),DSF+HFpEF组大鼠上述指标均显著下降(P<0.05)。Western blot和ELISA结果显示,与control组相比,HFpEF组大鼠心肌中NLRP3、cleaved caspase-1和GSDMD-N蛋白水平及炎症因子IL-1β和IL-18含量均显著升高(P<0.05);与HFpEF组相比,DSF+HFpEF组大鼠上述指标均显著下降(P<0.05)。结论:DSF可改善HFpEF大鼠心功能,抑制心肌重构,其机制可能与抑制NLRP3/caspase-1/GSDMD信号通路、减轻心肌炎症反应有关。AIM:To investigate the role and possible mechanisms of disulfiram(DSF)in a rat model of heart failure with preserved ejection fraction(HFpEF)induced by high-fat diet(HFD)and nitric oxide blocker Nω-nitro-L-arginine methyl ester(L-NAME).METHODS:The HFpEF rat model was constructed using HFD and L-NAME.Sprague-Dawley rats were randomly divided into 3 groups:control group(fed with a normal diet and water),HFpEF group(fed with HFD and drinking water containing 0.5 g/L L-NAME),and DSF+HFpEF group(treated with DSF in addition to HFD and L-NAME).After 5 weeks,cardiac function of the rats was examined using echocardiography and exercise test.Myocardial pathological changes were detected using hematoxylin-eosin and wheat germ agglutinin staining,the degree of cardiac fibrosis was assessed using Masson staining,and apoptosis levels were observed using TUNEL staining.Western blot was performed to detect the expression of nucleotide-binding oligomerization domain-like receptor protein 3(NLRP3),cleaved caspase-1,gasdermin D N-terminal fragment(GSDMD-N)in the myocardium,and serum level of N-terminal pro-brain natriuretic peptide(NT-proBNP),and interleukin(IL)-1βand IL-18 in the myocardium were detected by ELISA.RESULTS:Compared with control group,the rats in HFpEF group showed increased body weight,systolic blood pressure,diastolic blood pressure,E/E′ratio,left ventricular anterior wall thickness at diastole and serum NT-proBNP level(P<0.05),and decreased E/A ratio and absolute value of global longitudinal strain(GLS;P<0.05).In contrast,the rats in DSF+HFpEF group showed decreased body weight,E/E′ratio,diastolic blood pressure and serum NT-proBNP level(P<0.05),and increased E/A ratio and absolute value of GLS(P<0.05),with no significant changes in systolic blood pressure,left ventricular posterior wall thickness at diastole and left ventricular ejection fraction(P>0.05).The rats in HFpEF group had increased myocardial fibrosis area,cardiomyocyte cross-sectional area,and apoptotic rate compared with control group(P<0.05),w

关 键 词：双硫仑 射血分数保留的心力衰竭 NLRP3/caspase-1/GSDMD信号通路 

分 类 号：R541.6[医药卫生—心血管疾病] R972[医药卫生—内科学] R363.2[医药卫生—临床医学]