CD31, a marker of microcirculation formation, was stained and also indicated that miR-17-5p silencing promotes endothelial growth after MI compared to the Ad-NC-Antagomir-17 group (0.814 ± 0.047 vs. 0.360 ± 0.166 at 7 days after MI, 0.736 ± 0.069 vs. 0.432 ± 0.181 at 28 days after MI, p < 0.05). Here, PECAM1 is linked to myocardial infarction.