A comparative study on the secretion of various cytokines by human adipose-derived stem cells at different passages / 中国组织工程研究

ABSTRACT

BACKGROUND: Adipose-derived stem cells (ADSCs) can establish a favorable repair microenvironment by secreting abundant cytokines, which allows ADSCs to be a good source of seed cells for the treatment of ischemic diseases. OBJECTIVE: To investigate the changes of cytokines secreted by human ADSCs at passages 2-10. METHODS: After isolation and culture of ADSCs from human adipose tissue, the morphological features of cells were observed under inverted microscope. Human ADSCs were identified by the immunophenotypes and differentiation capability. RESULTS AND CONCLUSION: ADSCs were fusiform or polygonal in shape, with buging cell body, homogenized cytoplasm and clear nuclei, and could differentiate into adipocytes, osteocytes and chondroblasts in vitro. ADSCs at passage 3 were positive for CD29 (99.21%), CD73 (99.65%) and CD90 (99.92%), but negative for hematopoietic marker CD34 (2.25%). ELISA results showed that ADSCs at passage 5 had the highest secretion levels of vascular endothelial growth factor and hepatocyte growth factor, while ADSCs at passage 3 had the highest secretion level of brain-derived neurotrophic factor. To conclude, ADSCs have steady biological features of stem cells and exhibit good growth and proliferation potentials. ADSCs at different passages have different capacities in the secretion of vascular endothelial growth factor, hepatocyte growth factor and brain-derived neurotrophic factor. Passage 5 ADSCs show the highest ability to secrete vascular endothelial growth factor and hepatocyte growth factor, while passage 3 ADSCs show the strongest potential to secrete brain-derived neurotrophic factor.