Effect of MicroRNA-214 on Migration of Cord Blood CD34+ Cells Induced by Bone Marrow Mesenchymal Stem Cells

Abstract

To investigate the possible effect of MicroRNA-214 (miR-214) on migration of umbilical cord blood CD34+ hematopoietic stem/progenitor cells induced by BM-MSC. After transfection of the inhibitor or mimic of miR-214, the cultured supernatant of BM-MSC were collected respectively. The expression of miR-214 in BM-MSC was detected by real time quantitative PCR, the effect of supernatant on CD34+ cell migration was evaluated by chemotaxis assays. The levels of chemokine(SDF-1) secreted by BM-MSC in the supernatant were detected by ELISA. The cultured supernatant of BM-MSC could promote the migration of CD34+ cells. Compared with the group without transfection or negative control(NC) group, the transfection with miR-214 mimic could promote the migration of CD34+ cells (P<0.01), while the migration rate in miR-214 inhibitor groups decreased significantly (P<0.01). Further study found that the concentration of SDF-1 was not changed notably in all groups (P>0.05), as compared with the control group. miR-214 signalings may indirectly increase the migration of CD34+ hematopoietic stem/progenitor cells by modulating BM-MSC functions, which may not significantly correlate with the chemokine SDF-1 secreted by BM-MSC.