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• W2498470071 abstract "Background Apelin-13 (A13) regulates cardiac homeostasis. However, the effects and mechanism of A13 infusion after an acute myocardial injury (AMI) have not been elucidated. This study assesses the restorative effects and mechanism of A13 on the peri-infarct region in murine AMI model. Methods 51 FVB/N mice (12 weeks, 30 g) underwent AMI. A week following injury, continuous micro-pump infusion of A13 (0.5 μg/g/day) and saline was initiated for 4-week duration. Dual contrast MRI was conducted on weeks 1, 2, 3, and 5, consisting of delayed-enhanced and manganese-enhanced MRI. Four mice in each group were followed for an extended period of 4 weeks without further infusion and underwent MRI scans on weeks 7 and 9. Results A13 infusion demonstrated preserved LVEF compared to saline from weeks 1 to 4 (21.9 ± 3.2% to 23.1 ± 1.7%* vs. 23.5 ± 1.7% to 16.9 ± 2.8%, *p = 0.02), which persisted up to 9 weeks post-MI (+1.4%* vs. −9.4%, *p = 0.03). Mechanistically, dual contrast MRI demonstrated significant decrease in the peri-infarct and scar % volume in A13 group from weeks 1 to 4 (15.1 to 7.4% and 34.3 to 25.1%, p = 0.02, respectively). This was corroborated by significant increase in 5-ethynyl-2′-deoxyuridine (EdU+) cells by A13 vs. saline groups in the peri-infarct region (16.5 ± 3.1% vs. 8.1 ± 1.6%; p = 0.04), suggesting active cell mitosis. Finally, significantly enhanced mobilization of CD34+ cells in the peripheral blood and up-regulation of APJ, fibrotic, and apoptotic genes in the peri-infarct region were found. Conclusions A13 preserves cardiac performance by salvaging the peri-infarct region and may contribute to permanent restoration of the severely injured myocardium." @default.
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• W2498470071 date "2016-11-01" @default.
• W2498470071 modified "2023-10-15" @default.
• W2498470071 title "Apelin-13 infusion salvages the peri-infarct region to preserve cardiac function after severe myocardial injury" @default.
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• W2498470071 doi "https://doi.org/10.1016/j.ijcard.2016.07.263" @default.
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