紧密连接蛋白在缺血再灌注肾损伤小鼠肾脏中的表达及意义

目的 探讨紧密连接蛋白claudin-2、claudin-10和claudin-17在缺血再灌注肾损伤模型小鼠肾脏中的表达及意义。方法 将152只雄性C57BL/6小鼠随机分为对照组（n=8）、假手术组（n=72）及模型组（n=72）。采用夹闭小鼠双侧肾蒂30 min的方法建立缺血再灌注肾损伤小鼠模型，假手术组及模型组依据再灌注后时间点（0、3、6、12、24、48、72 h及5 d、7 d）分为9个亚组，每组8只小鼠。分别采用RT-PCR法及免疫组化法分别检测各组小鼠肾组织紧密连接蛋白claudin-2、-10、-17 mRNA及其蛋白表达水平。结果 对照组及假手术组小鼠肾组织claudin-2、-10、-17 mRNA及其蛋白表达水平随再灌注时间点无明显变化（P > 0.05）。与对照组及假手术组比较，再灌注后模型组claudin-2、-10 mRNA及其蛋白表达水平降低，且随着再灌注时间的推移逐渐减弱，至再灌注24 h时达到最低水平（P < 0.05）；再灌注后模型组claudin-17 mRNA及其蛋白表达水平增高，且随再灌注时间的推移逐渐增高，至再灌注12 h时mRNA及24 h时蛋白水平达到最高（P < 0.05）。结论 缺血再灌注肾损伤与紧密连接蛋白claudin-2、-10、-17的异常表达密切相关。

Expression and significance of tight junction proteins in the kidney in a mouse model of renal ischemia-reperfusion injury

Objective To study the expression and significance of tight junction proteins (claudin-2, claudin-10, and claudin-17) in a mouse model of renal ischemia-reperfusion injury.Methods A total of 152 male C57BL/6 mice were randomly assigned to control group (n=8), sham-operation group (n=72), and model group (n=72). The renal pedicles at both sides were clamped for 30 minutes to establish a mouse model of renal ischemia-reperfusion injury. According to the time points of reperfusion (0, 3, 6, 12, 24, 48, and 72 hours and 5 and 7 days), the sham-operation group and the model group were further divided into 9 subgroups, with 8 mice in each subgroup. RT-PCR and immunohistochemistry were used to measure the mRNA and protein expression of claudin-2, claudin-10, and claudin-17 in renal tissue.Results The control and sham-operation groups had no significant changes in the mRNA and protein expression of claudin-2, claudin-10, and claudin-17 in renal tissue over the time of reperfusion (P > 0.05). Compared with the control and sham-operation groups, the model group had decreased mRNA and protein expression of claudin-2 and claudin-10 after reperfusion, and the expression decreased gradually over the time of reperfusion, with the lowest levels at 24 hours of reperfusion (P < 0.05). Compared with the control and sham-operation groups, the model group had increased mRNA and protein expression of claudin-17 after reperfusion, and the expression increased gradually over the time of reperfusion, with the highest mRNA level at 12 hours and the highest protein level at 24 hours of reperfusion (P < 0.05).Conclusions Renal ischemia-reperfusion injury is closely associated with abnormal expression of tight junction proteins claudin-2, claudin-10, and claudin-17.