严重烧伤后大鼠心肌组织水通道蛋白-1表达变化及其意义

Changes of aquaporin-1 expression in rat myocardium after severe burn

目的探讨大鼠严重烧伤后心肌组织中水通道蛋白-1(AQP-1)的表达变化及意义。方法健康成年Wistar大鼠48只,分为正常对照组(n=6)、烫伤组(n=42);采用30%TBSAⅢ度烧伤大鼠模型,其中单纯烫伤组又分为2、4、8、12、24、48、72h组,每个时相点为6只动物。用干湿重法和ELSIA方法分别检测烧伤后不同时间段心肌组织含水量和AQP1的表达变化。结果严重烧伤后2h心肌组织含水量增加及AQP1表达增强;烧伤后12h达到高峰,烧伤后48h仍高于正常;统计学分析表明,AQP1的表达与心肌组织含水量呈显著正相关(r=0.844,P<0.01)。结论严重烧伤后AQP1蛋白表达明显增强可能导致心肌组织含水量的增加。试验提示AQP1可能参与介导烧伤后心肌水肿的病理进程。

Objective To investigate the changes in the myocardial expression of aquaporin-1 （AQP1） protein and its association with myocardial edema in rats with severe burns. Methods Forty-eight healthy adult Wistar rats were randomly divided into normal control group （n=6） and burn injury group with third degree burn of 30% total body surface area, and the latter group was further divided into 2, 4, 8, 12, 24, 48 and 72 h groups. The changes of myocardial water content were investigated by dry-wet weight methods. Enzyme-linked immunosorbent assay was used to detect the changes in AQP1 expression at different time points after sever burns. Results The myocardial water content and AQP1 expression increased significantly 2 h after the burn injury, reaching the peak levels at 12 h and remaining higher than the normal level at 48 h. A significant positive correlation was found between myocardial water content and AQP1 expression in the rats （r=0.868, P0.01）. Conclusion The severity of myocardial edema after severe burn is correlated to the expression level of AQPl protein, suggesting the important role of AQPl protein in pathological progression of myocardial edema.