小鼠不同心肌肥厚模型标志性基因表达变化的比较

摘要

目的：探索小鼠不同心肌肥厚模型间肥厚性标志基因心房利尿钠肽( ANP)、脑利尿钠肽( BNP)、β-肌球蛋白重链(β-MHC)基因表达的差异。方法取C57BL/6小鼠,采用肾上腹主动脉缩窄( AAC )、动静脉瘘( AVF )和异丙肾上腺素( ISO)分别建立小鼠心肌肥厚模型。造模结束,称取各小鼠体重(BW)、心脏重量(HW)和左室重量(LVW),计算心脏重量指数( HW/BW)和左心室指数( LVW/BW)；HE染色观察心肌病理组织形态学变化；免疫组织化学染色观察心肌组织ANP、BNP 和β-MHC蛋白表达；采用Real-time PCR检测心肌ANP、BNP 和β-MHC mRNA表达。结果与对照组比较,3种模型的HW/BW和LVW/BW升高,光镜下观察各模型小鼠心肌呈现不同程度的肥厚性变化, ANP、BNP和β-MHC在蛋白和mRNA表达水平均不同程度增加；与AAC组比较,AVF和ISO组心肌组织ANP、BNP和β-MHC在蛋白和mRNA表达水平均降低。结论3种心肌肥厚模型造模成功,AAC模型心肌组织在同时表达肥厚性标志基因ANP、BNP和β-MHC时优于AVF和ISO。%Aim To explore the differences in hyper-trophic marker genes such as atrial natriuretic peptide ( ANP) , brain natriuretic peptide ( BNP) and β-myo-sin heavy chain (β-MHC) genes in different models of cardiac hypertrophy. Methods Respectively using re-nal abdominal aortic coarctation ( AAC) , arteriovenous fistula ( AVF) and isoproterenol ( ISO) methods to es-tablish C57BL/6 mouse model of cardiac hypertrophy. After modeling, each mouse ’ s body weight ( BW ) , heart weight ( HW) and left ventricular weight ( LVW) were weighed, and the heart weight ( HW/BW) and left ventricular index ( LVW/BW ) were calculated;myocardium by HE staining, pathological morphologi-cal changes were observed; myocardium by immuno-histochemistry, ANP, BNP and β-MHC protein ex-pression was observed;myocardium by Real-time PCR detection, ANP, BNP and β-MHC mRNA expression was observed. Results Compared with control group, HW/BW and LVW/BW were increased in three mod-els. Through the light microscope, each mouse model showed varying degrees of cardiac hypertrophy. ANP, BNP and β-MHC were increased in the protein and mRNA expression. Compared with AAC group, AVF and ISO groups’ myocardial tissue ANP, BNP and β-MHC expression were decreased in the protein and mRNA expression. Conclusions Three cardiac hy-pertrophy models are successful. Cardiac tissue ANP, BNP and β-MHC expression in AAC model exceeds AVF and ISO model.