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The mechanisms underlying proangiogenic function of brain-derived neurotrophic factor (BDNF) are not fully understood. The current study was designed to explore the microRNA (miRNA) profile in human early endothelial progenitor cells (EPCs, also referred to as CFU-Hill cells) treated with BDNF. Treatment of early EPCs with BDNF for 7 d significantly increased the colony formation of outgrowth endothelial cells. BDNF suppressed the expression of miR-4716-5p, miR-3928, miR-433, miR-1294, miR-1539, and miR-19b-1*. In contrast, BDNF significantly increased the levels of miR-432*, miR-4499, miR-3911, miR-1183, miR-4669, miR-636, miR-4717-3p, miR-4298, miR485-5p, and miR-181c. Since miR-433 has been reported to augment hematopoietic cells proliferation and differentiation, we examined the role of miR-433 in regenerative effects of BDNF. BDNF stimulated the protein expression of guanylate-binding protein 2 via the suppression of miR-433. However, the knockdown of miR-433 was not sufficient to significantly increase the number of outgrowth endothelial cell colonies, suggesting that modulation of miR-433 alone does not stimulate regenerative capacity of EPCs. In aggregate, our results also suggest that the effect of BDNF on regenerative function of EPCs may depend on complex changes in the expression of microRNAs.

Effects of Brain-Derived Neurotrophic Factor on MicroRNA Expression Profile in Human Endothelial Progenitor Cells