Open AccessRepair of Infarcted Myocardium Mediated by Transplanted Bone Marrow–Derived CD34 + Stem Cells in a Nonhuman Primate Model
Author(s) -
Yoshioka Toru,
Ageyama Naohide,
Shibata Hiroaki,
Yasu Takanori,
Misawa Yoshio,
Takeuchi Koichi,
Matsui Keiji,
Yamamoto Keiji,
Terao Keiji,
Shimada Kazuyuki,
Ikeda Uichi,
Ozawa Keiya,
Hanazono Yutaka
Publication year - 2005
Publication title -
stem cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.159
H-Index - 229
eISSN - 1549-4918
pISSN - 1066-5099
DOI - 10.1634/stemcells.2004-0200
Subject(s) - biology , transplantation , cd34 , stem cell , bone marrow , endothelial stem cell , haematopoiesis , green fluorescent protein , andrology , immunology , microbiology and biotechnology , medicine , in vitro , biochemistry , gene
Rodent and human clinical studies have shown that transplantation of bone marrow stem cells to the ischemic myocardium results in improved cardiac function. In this study, cynomolgus monkey acute myocardial infarction was generated by ligating the left anterior descending artery, and autologous CD34 + cells were transplanted to the peri‐ischemic zone. To track the in vivo fate of transplanted cells, CD34 + cells were genetically marked with green fluorescent protein (GFP) using a lentivirus vector before transplantation (marking efficiency, 41% on average). The group receiving cells ( n = 4) demonstrated improved regional blood flow and cardiac function compared with the saline‐treated group ( n =4) at 2 weeks after transplant. However, very few transplanted cell–derived, GFP‐positive cells were found incorporated into the vascular structure, and GFP‐positive cardiomyocytes were not detected in the repaired tissue. On the other hand, cultured CD34 + cells were found to secrete vascular endothelial growth factor (VEGF), and the in vivo regional VEGF levels showed a significant increase after the transplantation. These results suggest that the improvement is not the result of generation of transplanted cell–derived endothelial cells or cardiomyocytes; and raise the possibility that angiogenic cytokines secreted from transplanted cells potentiate angiogenic activity of endogenous cells.