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[The expression of calcium-sensing receptor in rats with acute myocardial infarction and its effect on cells apoptosis]. | LitMetric
Objective : To investigate the change of calcium sensing receptor (CaSR) expression at different time in rat tissue with acute myocardial infarction (AMI) and its effect on cardiomyocyte apoptosis.Methods : The healthy Wistar rats were randomly divided into Sham and AMI groups, the rat myocardial infarction model was established by ligating left anterior descending coronary artery. The changes of cardiac morphology and hemodynamics were detected at 1, 2 and 4 weeks,respectively. The expressions of CaSR mRNA and protein in myocardial tissue were detected by RT-PCR and Western blot, respectively. The expressions of Bax, Bcl-2, caspase-3 and caspase-9 proteins were detected by Western blot. The serum levels of lactate dehydrogenase (LDH), creatine kinase (CK) activity and cardiac troponin (cTnT) were determined. The apoptosis of cardiomyocytes were tested by TUNEL staining.Results : Compared with the sham group, the expressions of CaSR mRNA and protein, the apoptosis index were increased significantly with the development of AMI (P＜0.05). The ultrastructural damage of cardiomyocytes was serious; the levels of LVSP, +dp/dt and -dp/dt were decreased,while the levels of LVEDP was increased (P＜0.05); In AMI group, the cTnT level, CK and LDH activities were all increased (P＜0.05). With the development of myocardial infarction, the cTnT level and CK activity were gradually decreased, while the activity of LDH was not significantly changed. The expressions of promote apoptosis-related Bax, caspase-3 and caspase-9 were significantly increased, and the expression of inhibited apoptosis-related protein(factor)Bcl-2 was significantly decreased (P＜0.05).Conclusion : With the development of myocardial infarction,the expressions of CaSR mRNA and protein,the apoptosis index in rat myocardial tissue were increased with time prolongation after AMI. The increased expression of CaSR is involved in rat myocardial infarction, which is related with apoptosis.
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