Evaluation of mobilized peripheral blood CD34+ cells from patients with severe coronary artery disease as a source of endothelial progenitor cells |
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| Authors: | Abba C Zubair Sunita Malik Athena Paulsen Masakazu Ishikawa Christopher Mccoy Peter X Adams David Amrani Marco Costa |
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| Institution: | 1. Transfusion Medicine, Department of Pathology, Mayo Clinic, Jacksonville, Florida, USA;2. Division of Cardiology, Harrington-McLaughlin Heart and Vascular Institute, University Hospitals of Cleveland, Case Western Reserve University, Cleveland, Ohio, USA;3. Cellular Therapies, Baxter Healthcare, Deerfield, Illinois, USA;1. Visual Research Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan;2. Department of Ophthalmology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan;3. Department of Neuro-ophthalmology, Tokyo Metropolitan Neurological Hospital, Fuchu, Tokyo, Japan;1. Central of Clinical Laboratory, Shimane University Hospital, Japan;2. Division of Blood Transfusion, Shimane University Hospital, Japan;1. Department of Medicine, University of Vermont, Burlington, Vermont, USA;2. Department of Cardiothoracic Surgery, Great Ormond Street Hospital, London, United Kingdom;3. International Society for Cell Therapy, Vancouver, British Columbia, Canada;4. Royal National Throat Nose, and Ear Hospital and University College London, London, United Kingdom |
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| Abstract: | Background aimsThe distinction between hematopoietic stem cells (HSC) and endothelial progenitor cells (EPC) is poorly defined. Co-expression of CD34 antigen with vascular endothelial growth factor (VEGF) receptor (VEGFR2) is currently used to define EPC (1).MethodsWe evaluated the phenotypic and genomic characteristics of peripheral blood-derived CD34+ cells in 22 granulocyte–colony-stimulating factor (G-CSF)-mobilized patients with severe coronary artery disease and assessed the influence of cell selection and storage on CD34+ cell characteristics.ResultsThe median CD34+ cell contents in the products before and after enrichment with the Isolex 300i Magnetic Cell Selection System were 0.2% and 82.5%, respectively. Cell-cycle analysis showed that 80% of CD34+ cells were in G0 stage; 70% of the isolated CD34+ cells co-expressed CD133, a marker for more immature progenitors. However, less than 5% of the isolated CD34+ cells co-expressed the notch receptor Jagged-1 (CD339) and only 2% of the isolated CD34+ population were positive for VEGFR2 (CD309). Molecular assessment of the isolated CD34+ cells demonstrated extremely low expression of VEGFR2 and endothelial nitric oxide synthase (eNOS) and high expression of VEGF-A. Overnight storage at 4°C did not significantly affect CD34+ cell counts and viability. Storage in liquid nitrogen for 7 weeks did not affect the percentage of CD34+ cells but was associated with a 26% drop in cell viability.ConclusionsWe have demonstrated that the majority of isolated CD34+ cells consist of immature and quiescent cells that lack prototypic markers of EPC. High VEGF-A gene expression might be one of the mechanisms for CD34+ cell-induced angiogenesis. |
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