Effect of dedimethyloxalylglycine preconditioning on angiogenesis in vitro and after transplantation. (A), (B) Tube formation test stimulated by Matrigel was performed to identify the angiogenic activity of control bone marrow mesenchymal stem cells (C-BMSCs) and dedimethyloxalylglycine-preconditioned BMSCs (DMOG-BMSCs) in vitro. (C) to (H) Angiogenesis was inspected using von Willebrand factor staining (red) in heart sections from the myocardial infarction (MI), C-BMSC and DMOG-BMSC groups 4 weeks after MI. Hoechst staining (blue) shows the total cells. (I) Summary of total tube length measured in (A) and (B). The total tube length in the C-BMSC group was arbitrarily presented as 1. n =3 independent measurements. (J) Summary of total vessel density in different groups of in vivo experiments. n =8 animals in each group. *P <0.05 compared with C-BMSC group; #P <0.05 compared with MI control group.