Oscillating field stimulation promotes neurogenesis of neural stem cells through miR-124/Tal1 axis to repair spinal cord injury in rats.

Abstract

Spinal cord injury often leads to severe motor and sensory deficits, and prognosis using the currently available therapies remains poor. Therefore, we aimed to explore a novel therapeutic approach for improving the prognosis of spinal cord injury. In this study, we implanted oscillating field stimulation devices and transplanted neural stem cells into the thoracic region (T9-T10) of rats with a spinal cord contusion. Basso-Beattie-Bresnahan scoring revealed that oscillating field stimulation combined with neural stem cells transplantation promoted motor function recovery following spinal cord injury. In addition, we investigated the regulation of oscillating field stimulation on the miR-124/Tal1 axis in neural stem cells. Transfection of lentivirus was performed to investigate the role of Tal1 in neurogenesis of neural stem cells induced by oscillating field stimulation. Quantitative reverse transcription-polymerase chain reaction, immunofluorescence and western blotting showed that oscillating field stimulation promoted neurogenesis of neural stem cells in vitro and in vivo. Hematoxylin and eosin staining showed that oscillating field stimulation combined with neural stem cells transplantation alleviated cavities formation after spinal cord injury. Taking the results together, we concluded that oscillating field stimulation decreased miR-124 expression and increased Tal1 content, thereby promoting the neurogenesis of neural stem cells. The combination of oscillating field stimulation and neural stem cells transplantation improved neurogenesis, and thereby promoted structural and functional recovery after spinal cord injury.