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The aim of this study was to determine the effects of paracrine regulation on the invasive ability of MCF-7 human breast cancer cells through human adipose-derived stem cell (hADSC) adipogenesis. hADSC differentiation of the third and fourth passages of cells was induced in different induction media: osteogenic, adipogenic and chondrogenic. Transwell migration assays in the differently conditioned media, flow cytometry, enzyme-linked immunosorbent assay and western blot analysis for selected cytokines were performed. The flow cytometric analysis demonstrated positive expression of CD29, CD44 and CD105, while expression of CD34 and CD45 was not identified. The transwell migration assay showed that the invasive ability of MCF-7 cells was significantly enhanced during hADSC adipogenesis. hADSCs exerted a significantly positive effect on the invasive activity of MCF-7 cells during adipo-genesis. The results indicate that the high expression levels of activating protein 2 (aP2) in MCF-7 and adipocytes induced for 12 days may be associated with cell growth, invasion and metastasis. Peroxisome proliferator-activated receptor γ may be involved in fatty syntheses during adipogenic initiation and following adipogenic differentiation, possibly acting as a protection factor resulting in cell maturation and differentiation. This study also demonstrated that the expression of vascular endothelial growth factor was repressed by hADSCs, while that of matrix metalloproteinase-2 and urokinase-type plasminogen activator was increased to a significant level.

Human adipose-derived stem cell adipogenesis induces paracrine regulation of the invasive ability of MCF-7 human breast cancer cells in vitro