Different Biological Properties of Circulating and Bone Marrow Endothelial Progenitor Cells in Acute Myocardial Infarction Rats

Abstract

Background: Many studies have shown that endothelial progenitor cell (EPC) can enhance the neovascularization of the ischemic myocardium. Peripheral blood and bone marrow are the most convenient resources for EPC.

Objective: The aim of the study was to investigate, in vitro and in vivo, the different biological properties between circulating EPC (CEPC) and bone marrow EPC (BM‐EPC) of AMI rats.

Methods: The proliferative, migrative, adherent and angiogenic properties were investigated in vitro. 1 × 10⁶ CEPCs, 1 × 10⁶ BM-EPCs and medium (EBM-2) were injected in the myocardium of AMI rats. Echocardiography, regional myocardial blood flow (RMBF), capillary density and Y chromosome fluorescence in situ hybridization (FISH) were performed at 4 weeks after transplantation.

Results: The CEPCs had higher proliferative, migrative, adherent capabilities and lower senescent ratio, could adhere more quickly to fibronectin than BM-EPCs. CEPCs could form capillary-like structures whereas BM-EPCs did not show similar structures on Matrigel. In vivo, transplanted CEPCs and BM-EPCs were found in cardiac tissue by FISH. CEPCs treatment led to a better cardiac function, RMBF and capillary density than BM-EPCs.

Conclusion: Different biological properties were observed between CEPCs and BM-EPCs. Autologous CEPCs are more suitable for the AMI rat.

Key words

endothelial progenitor cells - bone marrow - circulating - acute myocardial infarction

References

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