Background This study sought to systematically investigate the derivation of late outgrowth endothelial progenitor cells (late EPC) and mesenchymal stem cells (MSC) from umbilical cord blood (UCB) and to examine their therapeutic effects on myocardial infarction (MI). Methods The expression of angiogenic genes was determined by qRT-PCR. Myocardial infarction (MI) was induced in rats, and cells were directly transplanted into the border regions of ischemic heart tissue. Results Culture of UCB mononuclear cells yielded two distinct types of cells by morphology after 2 weeks in the same culture conditions. These cells were identified as late EPC and MSC, and each was intramyocardially injected into rat hearts after induction of MI. Echocardiography and histologic analyses demonstrated that both EPC and MSC improved cardiac function and enhanced vascularization, although fibrosis was reduced only in the EPC transplanted hearts. Different paracrine factors were enriched in EPC and MSC. However, once injected into the hearts, they induced similar types of paracrine factors in the heart. Transplanted EPC or MSC were mostly localized at the perivascular areas. This study demonstrated that EPC and MSC can be simultaneously derived from UCB under the same initial culture conditions, and that common paracrine factors are involved in the repair of MI. Conclusion Late EPC and MSC are effective for infarct repair, apparently mediated through common humoral mechanisms.
Bibliographical noteFunding Information:
This work was supported in part by NIH grants DP3DK094346 , R01 HL127759 , Faculty Research Assistance Program of Yonsei University College of Medicine 2015, the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Korean government ( MSIP ) (No. 2015M3A9C6031514 ) and a grant from the Korean Healthcare Technology R&D Project, Ministry of Health and Welfare, Republic of Korea (no. HI10C1740 ) to Dr. Y-s Yoon; and a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (No. NRF-2013R1A1A2059998 ), (No. NRF-2015M3A9E6029558 ) and research fund of Catholic Kwandong University International St. Mary's Hospital ( CKURF-20150059 ). to Dr. S-W Kim.
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All Science Journal Classification (ASJC) codes
- Cardiology and Cardiovascular Medicine