摘要
目的探讨茶多酚对心力衰竭大鼠肾素-血管紧张素-醛固酮系统和转化生长因子-β1(TGF-β1)/Smads信号通路的作用机制。方法SD大鼠随机分为假手术组(Sham组)、模型组(Model组)、卡托普利治疗组(PC组)和茶多酚治疗组(TP组)。Model组、PC组和TP组大鼠采用丝线结扎左冠状动脉前降支建立心肌梗死后心力衰竭大鼠模型,Sham组不进行结扎。超声心动图检测心功能,HE染色检测心肌病理变化,Masson染色检测心肌纤维化,免疫组织化学染色检测Ⅰ型和Ⅲ型胶原的表达,ELISA法检测血管紧张素Ⅱ(AngⅡ)、醛固酮(ALD)、肾素(PRA)、白细胞介素(IL)-1β、IL-6和肿瘤坏死因子-α(TNF-α)的水平,Western blot检测TGF-β1、磷酸化Smad(p-Smad)2、Smad2、p-Smad3和Smad3蛋白表达。结果与Sham组比较,Model组大鼠心肌细胞排列紊乱,有明显的炎性细胞浸润,心肌纤维化程度明显升高(t=9.748,P=0.001),Ⅰ型胶原(t=11.754,P=0.001)和Ⅲ型胶原(t=10.573,P=0.001)表达明显升高,而射血分数(t=13.174,P=0.002)和左心室短轴缩短率(t=11.853,P=0.001)则明显降低,AngⅡ(t=4.246,P=0.001)、ALD(t=5.385,P=0.004)、PRA(t=4.386,P=0.004)、IL-1β(t=4.393,P=0.001)、IL-6(t=6.375,P=0.002)和TNF-α(t=4.753,P=0.002)表达水平明显升高,TGF-β1(t=6.365,P=0.001)、p-Smad2/Smad2(t=13.755,P=0.001)和p-Smad3/Smad3(t=11.657,P=0.002)蛋白表达明显升高;与Model组比较,PC组和TP组大鼠心肌病理变化得到明显改善,左心室舒张末期内径(t=6.367,P=0.003;t=5.264,P=0.003)、左心室收缩末期内径(t=5.253,P=0.002;t=5.974,P=0.001)、心脏质量指数(t=5.012,P=0.007;t=4.953,P=0.005)、左心室质量指数(t=5.531,P=0.003;t=5.483,P=0.004)、心肌纤维化程度(t=6.734,P=0.001;t=5.362,P=0.001)均明显降低,Ⅰ型胶原(t=5.373,P=0.001;t=4.364,P=0.001)和Ⅲ型胶原(t=6.764,P=0.001;t=4.579,P=0.001)表达明显降低,而射血分数(t=11.264,P=0.002;t=10.356,P=0.001)和左心室短轴缩短率(t=8.246,P=0.002;t=7.824,P=0.001)表达水平则明
Objective To investigate the effects of tea polyphenols on the renin-angiotensin-aldosterone system and the transforming growth factor-β1(TGF-β1)/Smads signaling pathway in heart failure rats.Methods SD rats were randomly assigned into a sham group,a model group,a captopril group(PC group),and a tea polyphenol group(TP group).The left anterior descending coronary artery was ligated with silk thread to establish the rat model of heart failure after myocardial infarction in the model group,PC group,and TP group,while it was not ligated in the sham group.Echocardiography was used to detect cardiac function.HE staining and Masson staining were conducted for the observation of myocardial pathological changes and myocardial fibrosis,respectively.Immunohistochemistry was employed to detect the expression of collagenⅠand collagenⅢ.ELISA kits were used to measure the levels of angiotensinⅡ(AngⅡ),aldosterone(ALD),plasma renin activity(PRA),interleukin-1β(IL-1β),IL-6,and tumor necrosis factor-α(TNF-α).Western blotting was employed to determine the protein levels of TGF-β1,phosphorylated Smad2(p-Smad2),Smad2,p-Smad3,and Smad3.Results Compared with the sham group,the model group showed disordered myocardial cells with obvious inflammatory cell infiltration,increased degree of myocardial fibrosis(t=9.748,P=0.001),elevated levels of collagenⅠ(t=11.754,P=0.001)and collagenⅢ(t=10.573,P=0.001),decreased ejection fraction(EF)(t=13.174,P=0.002)and left ventricular short axis shortening rate(LVFS)(t=11.853,P=0.001),and up-regulated expression of AngⅡ(t=4.246,P=0.001),ALD(t=5.385,P=0.004),PRA(t=4.386,P=0.004),IL-1β(t=4.393,P=0.001),IL-6(t=6.375,P=0.002),and TNF-α(t=4.753,P=0.002),and up-regulated protein levels of TGF-β1(t=6.365,P=0.001),p-Smad2/Smad2(t=13.755,P=0.001),and p-Smad3/Smad3(t=11.657,P=0.002).Compared with the model group,PC and TP alleviated the myocardial pathological changes,decreased the left ventricular end-diastolic diameter(LVEDd)(t=6.367,P=0.003 and t=5.264,P=0.003),left ventricular end-syst
作者
万林峰
袁志军
陈虎
WAN Linfeng;YUAN Zhijun;CHEN Hu(Department of Pharmacy,Yichun People’s Hospital,Yichun,Jiangxi 336000,China)
出处
《中国医学科学院学报》
CAS
CSCD
北大核心
2022年第3期384-391,共8页
Acta Academiae Medicinae Sinicae
基金
宜春市科技计划项目(JXYC2017KSA011)。
