Circular RNA 0001273 in exosomes derived from human umbilical cord mesenchymal stem cells (UMSCs) in myocardial infarction.

To investigate whether human umbilical cord mesenchymal stem cells (UMSCs) derived exosomes (exosome) can repair the heart after myocardial infarction (MI) by delivering circ-0001273 and its mechanism. Through the Sprague Dawley (SD) rat MI model was established, at the same time, we designed si-circ-0001273. Phosphate-buffered saline (PBS), exosome and si-circ-0001273-exosome were transplanted into ischemic hearts of rat, respectively. Through the echocardiography, hematoxylin-eosin staining (HE) method to detect the rat heart recovery. Meanwhile, H9c2 was treated with hypoxic serum-free serum to construct an in vitro apoptosis model to further explore the effect of circ-0001273 on myocardial cell apoptosis. Compared with the exosome-treated group, the left ventricular ejection fraction (EF) and shortened fraction (FS) of the rat heart was remarkably reduced and the cardiac structure was more disordered in the si-circ-0001273-exosome-treated group. Meanwhile, in vitro TUNEL staining and flow cytometry detection, results showed that compared with the exosome co-culture group, the incidence of H9C2 cell apoptosis in the si-circ-0001273-exosome co-culture group was obviously increased. Circ-0001273 can remarkably inhibit the occurrence of myocardial cell apoptosis in ischemic environment, promote MI repair, and provide a good reference for clinical treatment.