Objective To investigate the effect of nerve growth factor(NGF) overexpression via lentivirus transfection on the differentiation of umbilical cord mesenchymal stem cells(UMSCs). Methods UMSCs were isolated and cultured, then identified by flow cytometry, and then transfected with lentiviral vectors to overexpress NGF. After 72 hours, the expression of NGF and GFP was detected by immunofluorescence, and the expression of NGF protein was detected by Western blot. In the cell supernatant, the content of NGF w...