CyPA-CD147-ERK1/2-cyclinD2信号通路在大鼠左心室肥厚过程中表达上调(英文)

CyPA-CD147-ERK1/2-cyclin D2 signaling pathway is upregulated during rat left ventricular hypertrophy

亲环素A(cyclophilin A,Cy PA),其受体CD147及其下游信号通路在心肌肥厚过程中变化情况不清楚。本实验目的是研究血清Cy PA、心肌中Cy PA、CD147及其信号通路与心肌肥厚的关系。大鼠左心室肥厚模型用2肾2夹(2-kidney,2-clip,2K2C)方法制备,并观察1周,4周和8周。用左心质量和体重比值(ratio of left ventricular heart weight to body weight,LVW/BW)及心肌横切面面积(cross sectional area,CSA)评价左心室肥厚。用ELISA检测血清中Cy PA水平。用蛋白免疫印迹和免疫组化观察Cy PA、CD147、磷酸化ERK1/2和cyclin D2在心肌组织中表达水平。在第4周和8周,与对照组比较,2K2C组大鼠血压明显增高,LVW/BW和CSA显著增加。ELISA结果显示2K2C组大鼠血清中Cy PA水平随着左心室肥厚程度加剧而明显增加。蛋白免疫印迹和免疫组化结果表明,Cy PA、CD147、磷酸化ERK1/2和cyclin D2在2K2C组大鼠心肌组织中表达水平也随左心室肥厚发展而增加。本研究表明血清中Cy PA水平以及心肌组织中Cy PA-CD147-ERK1/2-cyclin D2信号通路在心肌肥厚发展过程中被激活并表达上调,提示该信号通路在左心室肥厚发病机制中可能发挥了作用。

The changes of serum cyclophilin A （CyPA）, its receptor CD147 and the downstream signaling pathway during the process of cardiac hypertrophy remain unknown. The present study aims to investigate the relationships between CyPA-CD147-ERK1/2-cyclin D2 signaling pathway and the development of cardiac hypertrophy. Left ventricular hypertrophy was prepared by 2-kidney, 2-clip in Sprague-Dawley rats and observed for 1 week, 4 and 8 weeks. Left ventricular hypertrophy was evaluated by ratio of left ventricular heart weight to body weight （LVW/BW） and cardiomyocyte cross sectional area （CSA）. CyPA levels in serum were determined with a rat CyPA ELISA kit. Expressions of CyPA, CD147, phospho-ERK1/2 and cyclin D2 in left ventricular myocytes were determined by Western blot and immunostaining. Compared with sham groups, systolic blood pressure reached hypertensive levels at 4 weeks in 2K2C groups. LVW/BW and CSA in 2K2C groups were significantly increased at 4 and 8 weeks after clipping. ELISA results indicated a prominent increase in serum CyPA level associated with the degree of left ventricular hypertrophy. Western blot revealed that the expressions of CyPA, CD147, phospho-ERK1/2 and cyclin D2 in left ventricular tissues were also remarkably increased as the cardiac hypertrophy developed. The results of the present study demonstrates that serum CyPA and CyPA-CD147-ERK1/2-cyclin D2 signaling pathway in ventricular tissues are time-dependently upregulated and activated with the process of left ventricular hypertrophy. These data suggest that CyPA-CD147 signaling cascade might play a role in the pathogenesis of left ventricular hypertrophy, and CyPA might be a prognosticator of the degree of left ventricular hypertrophy.