Functional recovery in chronic paraplegia after bone marrow stromal cells transplantation.
Previous reports showed the therapeutic effect of transplants of bone marrow stromal cells (BMSC) after incomplete traumatic spinal cord lesions. We studied the effect of this form of therapy in chronically paraplegic Wistar rats due to severe spinal cord injury (SCI). Rats were subjected to weight-drop impact causing paraplegia, and BMSC or phosphate buffered saline (PBS) was injected into spinal cord 3 months after injury. Functional outcome was measured using the Basso-Beattie-Bresnehan score until sacrifice of the animals, 4 weeks after transplantation. At this time, samples of spinal cord tissue were studied histologically. The results showed a clear and progressive functional recovery of the animals treated with BMSC transplantation, compared to controls. Grafted BMSC survived into spinal cord tissue, forming cell bridges within the traumatic centromedullary cavity. In this tissue, cells expressing neuronal and astroglial markers can be seen, together with a marked ependymal proliferation, showing nestin-positivity. These findings suggest the utility of BMSC transplantation in chronically established paraplegia.
Zurita
Mercedes
M
Neuroscience Research Unit of the Mapfre-Medicine Foundation, Neurosurgical Service, Puerta de Hierro Hospital, Department of Surgery, Autonomous University, Madrid, Spain.
Vaquero
Jesús
J
D000818:Animals; D016026:Bone Marrow Transplantation / Q000379:methods*; D002908:Chronic Disease; D005260:Female; D008297:Male; D010264:Paraplegia / Q000473:pathology / Q000601:surgery*; D051381:Rats; D017208:Rats, Wistar; D020127:Recovery of Function / Q000502:physiology*; D013119:Spinal Cord Injuries / Q000473:pathology / Q000601:surgery*; D017154:Stromal Cells / Q000637:transplantation