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Study finds axon regeneration after Schwann cell graft to injured spinal cord
Date:12/23/2013

Putnam Valley, NY. (Dec. 23 2013) A study carried out at the University of Miami Miller School of Medicine for "The Miami Project to Cure Paralysis" has found that transplanting self-donated Schwann cells (SCs, the principal ensheathing cells of the nervous system) that are elongated so as to bridge scar tissue in the injured spinal cord, aids hind limb functional recovery in rats modeled with spinal cord injury.

The study will be published in a future issue of Cell Transplantation but is currently freely available on-line as an unedited early e-pub at: http://www.ingentaconnect.com/content/cog/ct/pre-prints/content-ct1074Williams.

"Injury to the spinal cord results in scar and cavity formation at the lesion site," explains study corresponding author Dr. Mary Bartlett Bunge of the University of Miami Miller School of Medicine. "Although numerous cell transplantation strategies have been developed to nullify the lesion environment, scar tissue - in basil lamina sheets - wall off the lesion to prevent further injury and, also, at the interface, scar tissue impedes axon regeneration into and out of the grafts, limiting functional recovery."

The researchers determined that the properties of a spinal cord/Schwann cell bridge interface enable regenerated and elongated brainstem axons to cross the bridge and potentially lead to an improvement in hind limb movement of rats with spinal cord injury.

Electron microscopy revealed that axons, SCs, and astrocytes were enclosed together within tunnels bounded by continuous basal lamina. The expression of neuroglycan (NG2; a proteoglycan found on the membrane of cells) was associated with these tunnels. They subsequently determined that a "trio" of astrocyte processes, SCs and regenerating axons were "bundled" together within the tunnels of basal lamina.

"Elongation of astrocyte process
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Contact: Robert Miranda
cogcomm@aol.com
Cell Transplantation Center of Excellence for Aging and Brain Repair
Source:Eurekalert

Page: 1 2

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