Bladder Function Recovery in Rats With Traumatic Spinal Cord Injury After Transplantation of Neuronal-Glial Restricted Precursors or Bone Marrow Stromal Cells

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Abstract

Purpose:

We investigated functional recovery of the lower urinary system in rats with spinal cord injury after transplanting neuronal restricted precursors/glial restricted precursors or neural cells derived from bone marrow stromal cells into the injured area of the spinal cord.

Materials and Methods:

A total of 30 rats underwent experimentation in 4 groups, including group 1—sham operation, group 2—spinal cord injury plus neuronal restricted precursor/glial restricted precursor transplantation, group 3—spinal cord injury plus bone marrow stromal cell transplantation and group 4—spinal cord injury control. All rats in the 4 groups were investigated urodynamically and sacrificed on day 28 after transplantation. The cells transplanted into the injured spinal cord underwent histological investigation.

Results:

Transplanted cells (neuronal and glial restricted precursors, and bone marrow stromal cells) were found to maintain a presence in the injured spinal cord area. Baseline pressure, maximum capacity, mean uninhibited contraction amplitude, mean voiding pressure, voided volume and post-void residual volume were significantly better in groups 2 and 3 than in group 4, while baseline pressure in group 2 was better than that in group 3. We found no significant difference among the groups according to mean uninhibited contraction frequency.

Conclusions:

Although neuronal/glial restricted precursor transplanted rats seemed to have more improvement, all rats in groups 2 and 3 showed some significant improvement in lower urinary system function. On the other hand, the level of this improvement was far from complete functional recovery.

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