Wei Wu and Xiao-Ming Xu (Credit: IU School of Medicine)
Researchers at Indiana University School of Medicine (Indianapolis, USA) have announced the successful reprogramming of a glial cell type in the central nervous system into new neurons in order to promote recovery after spinal cord injuryrevealing an untapped potential to leverage the cell for regenerative medicine.
This is the first time that scientists have reported modifying a NG2 gliaa type of supporting cell in the central nervous systeminto functional neurons after spinal cord injury, saidWei Wu, research associate in neurological surgery at IU School of Medicine and co-first author of the paper, which was published in the Cell Stem Cell journal.
Wu andXiao-Ming Xu, the Mari Hulman George professor of Neuroscience Research at IU School of Medicine, worked on the study with a team of scientists from the University of Texas Southwestern Medical Center.
Spinal cord injuries affect hundreds of thousands of people in the United States, with thousands more diagnosed each year. Neurons in the spinal cord dont regenerate after injury, which typically causes a person to experience permanent physical and neurological ailments.
Unfortunately, effective treatments for significant recovery remain to be developed, Xu said. We hope that this new discovery will be translated to a clinically relevant repair strategy that benefits those who suffer from a spinal cord injury.
When the spinal cord is injured, glial cells, of which there are three typesastrocyte, ependymal and NG2respond to form glial scar tissue.
Wu added: Only NG2 glial cells were found to exhibit neurogenic potential in the spinal cord following injury in adult mice, but they failed to generate mature neurons. Interestingly, by elevating the critical transcription factor SOX2, the glia-to-neuron conversion is successfully achieved and accompanied with a reduced glial scar formation and increased functional recovery following spinal cord injury.
The researchers reprogrammed the NG2 cells from the mouse model using elevated levels of SOX2a transcription factor found inside the cell thats essential for neurogenesisto neurons. This conversion has two purposes, Xu said: to generate neurons to replace those lost due to a spinal cord injury and reduce the size of the glial scars in the lesion area of the damaged tissue.
This discovery, serves as an important target in the future for potential therapeutic treatments of spinal cord injury, adds Wu, who goes on to note that such a collaboration will be continued between the two laboratories to address neuronal remodelling and functional recovery after successful conversion of glial cells into functional neurons in future.
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