Clinical evidence that very small embryonic-like stem cells are mobilized into peripheral blood in patients after stroke - PubMed (original) (raw)
. 2009 Apr;40(4):1237-44.
doi: 10.1161/STROKEAHA.108.535062. Epub 2009 Feb 26.
Affiliations
- PMID: 19246697
- DOI: 10.1161/STROKEAHA.108.535062
Clinical evidence that very small embryonic-like stem cells are mobilized into peripheral blood in patients after stroke
Edyta Paczkowska et al. Stroke. 2009 Apr.
Abstract
Background and purpose: In a murine model of stroke, we identified a population of very small embryonic-like (VSEL) stem cells (SCs) in adult murine bone marrow that could be mobilized into peripheral blood (PB). This raised the question of whether a similar population of cells is mobilized in human stroke patients.
Methods: We evaluated a number of cells that corresponded to VSEL SCs in the PB of 44 stroke patients and 22 age-matched controls. After each patient's stroke, PB samples were harvested during the first 24 hours, on day +3, and on day +7 and then compared with normal controls. The circulating human cells with the phenotype of VSEL SCs were evaluated in PB by real-time quantitative polymerase chain reaction, fluorescence-activated cell sorting analysis, and direct immunofluorescence staining. In parallel, we also measured the serum concentration of stromal derived factor-1 by ELISA.
Results: In stroke patients, we found an increase in the number of circulating cells expressing SC-associated antigens, such as CD133, CD34, and CXCR4. More important, we found an increase in the number of circulating primitive cells expressing the VSEL phenotype (CXCR4(+)lin(-)CD45(-) small cells), mRNA for Octamer-4 and Nanog, and Octamer-4 protein. All changes were accompanied by an increased serum concentration of stromal derived factor-1. Additionally, we found a positive correlation between stroke extensiveness, stromal derived factor-1 concentration in serum, and the number of CXCR4(+) VSEL SCs circulating in the PB.
Conclusions: We conclude that stroke triggers the mobilization of CXCR4(+) VSEL SCs that have potential prognostic value in stroke patients. However, the potential role of these mobilized cells in brain regeneration requires further study.
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