In recent studies, GLP-1R expression was not detected in ventricular myocytes,23 cardiac fibroblasts3,8,23 and coronary artery smooth muscle cells.23 In line with that, we did not find co-localization of GLP-1R and α-SMA-positive staining in the myocardium after MI and there was a negative correlation between 68Ga-NODAGA-exendin-4 uptake and α-SMA-positive staining in the infarcted area. Here, ACTA1 is linked to myocardial infarction.