病毒性心肌炎小鼠体内NT-proBNP的水平变化及意义

目的 探讨氨基末端脑利钠肽前体( NT-proBNP)在病毒性心肌炎( VMC)小鼠体内的水平变化及其意义. 方法100只Balb/c小鼠随机分为VMC组( n=60 )和对照组( n=40). VMC组小鼠腹腔注射柯萨奇B3病毒(CVB3),对照组注射等量不含病毒的DMEM液. VMC模型建立后分别在第3、7、14、28天每组随机处死10只小鼠,留取血液和心脏标本. 使用ELISA法检测两组小鼠血清中NT-proBNP含量, HE染色观察心肌组织病理改变. 分析VMC组小鼠不同时间血清NT-proBNP含量与心肌组织病理积分的关系. 结果VMC组小鼠血清 NT-proBNP水平明显高于对照组( P<0. 05 ) ,且VMC组不同时间的NT-proBNP水平之间差异有统计学意义 ( P<0. 05 ). 血清NT-proBNP水平与心肌组织病理积分呈显著正相关性(r=0. 829, P<0. 05). 结论 血清NT-proBNP水平可反映VMC小鼠心肌损伤的严重程度,可作为判断其危险分层的血清学指标之一.

The changes and significance of serum NT-proBNP levels in mice with viral myocarditis

Objective To investigate the changes and significance of serum N-terminal pro-brain natriuretic peptide ( NT-proBNP) levels in mice model with viral myocarditis( VMC) . Methods 100 Balb/c mice were randomly di-vided into VMC group ( n=60 ) and control group ( n=40 ) . Mice in VMC group were injected intraperitoneally coxsackievirus B3 ( CVB3 ) , while mice in control group were treated with the same amount of virus-free DMEM cul-tivate liquid. 10 mice of each group were sacrificed on 3, 7, 14, and 28th day after VMC modeling and their blood and heart tissues were collected. The serum NT-proBNP levels in two groups of mice were detected by ELISA. Pathological changes in myocardial tissue were examined with hematoxylin and eosin stain. The relationship be-tween serum NT-proBNP concentration and cardiac pathology score of VMC group at different time points were ana-lyzed. Results The serum NT-proBNP levels of VMC group were significantly higher than that of control group( P<0. 05 ) . There was a significant statistical difference between NT-proBNP levels of VMC group at different time points( P <0. 05 ) . The NT-proBNP level was positively correlated with myocardial histopathology scores ( r =0. 829 , P<0. 05 ) . Conclusion Serum NT-proBNP levels may reflect severity of myocardial injury in mice with VMC. NT-proBNP can be used as one of serum indicators to judge the risk stratification in mice with VMC.