摘要
Objective:To investigate the effects of ivabradine on Notch and NF-kappa B signaling pathway in myocardial cells of rats with myocardial infarction.Methods: The model of myocardial infarction was established by ligating the left anterior descending coronary artery. The surviving rats were randomly divided into model group (MI group,n=8) and treatment group (IVA group,n=8). Rats with the same location but without ligation of the left anterior descending coronary artery were used as control group (CON group,n = 8). IVA was administered for 28 d. Hemodynamic and cardiac function indexes of all rats were measured: heart rate (HR), systolic pressure (SBP), diastolic pressure (DBP), mean arterial pressure (MAP), left ventricular systolic pressure (LVSP), left ventricular end-diastolic pressure (LVEDP) and maximum rate of increase and decrease of left ventricular internal pressure (+dp/dt);left ventricular mass index, left ventricular cross-sectional diameter and infarct area;The expression of Notch signaling pathway components mRNA (Notch-1, Dll-4, Hes-1) in rat cardiomyocytes was detected by PT-PCR, and the expression of DICD-1 and P65 protein was detected by western-blot. One-way ANOVA was used for comparison between groups, and SNK was used for comparison between groups.Results: SBP, DBP, MAP, LASP, LVEDP and (+dp/dt) in MI group were lower than those in control group (P<0.05), while IVA was higher than those in MI group (P<0.05). Left ventricular mass index and left ventricular sectional diameter in MI group were significantly higher than those in control group (P<0.05), but lower than those in IVA group (P<0.05). The expression of Notch-1 in MI group was significantly higher than that in control group (P<0.05), but lower than that in IVA group (P<0.05). There was no significant difference in the expression of Dll-4 and Hes-1 mRNA between the three groups (P>0.05). The expression levels of NICD-1 and P 65 in MI group were significantly higher than those in CON group (P<0.05), but lower than those in IVA group (P<0.05). Conclusion: IVA may improve cardiac function and inhibit ventricular remodeling in rats with myocardial infarction through Notch and NF-kappa B signaling pathways.
