Abstract
Study design:
Experimental investigation of intrathecal transplantation of stem cells by lumbar puncture (LP) in a rat model that simulates human thoracic spinal cord injury (SCI).
Objectives:
To examine the distribution and phenotype of spinal cord-derived neural stem/progenitor cells (NSPCs) and bone marrow-derived mesenchymal stromal cells (BMSCs) following LP transplantation in SCI rats.
Setting:
Toronto Western Research Institute, Toronto, Ontario, Canada.
Methods:
NSPCs or BMSCs were transplanted via LP at level L3–5 1 week after compression SCI at T8. Rats were killed at 3, 17 and 27 days after LP transplantation and the relative distribution of cells at C4, T8 and L3–5 was quantitated. The phenotype of the NSPC and BMSC was assessed with immunocytochemistry in vitro and following LP transplantation.
Results:
By 4 weeks, more NSPC migrated to the lesion site relative to BMSC and uninjured animals. However, there was no preferential homing of either of these types of cells into the parenchyma of the injury site, and most of the transplanted cells remained in the intrathecal space. In vitro, spinal cord-derived NSPC proliferated and expressed nestin, but after LP transplantation, NSPC became post-mitotic and primarily expressed oligodendrocyte markers. In contrast, BMSC did not express any neural antigens in vivo.
Conclusion:
LP is a minimally invasive method of cell transplantation that produces wide dissemination of cells in the subarachnoid space of the spinal cord. This is the first study to report and quantify the phenotype and spatial distribution of LP transplanted NSPC and BMSC in the intact and injured spinal cord.
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Acknowledgements
This work was supported by the Canadian Institutes of Health Research (CIHR NET), the Multiple Sclerosis Society of Canada, and by the Canadian Paraplegic Association (Ontario Branch). We thank Kurt van Bendegem for preparing the digitized schematic diagram in Figure 1. We also thank Linda Lee and Rita van Bendegem for tissue processing and Kenny Zhan for help with data analysis.
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Mothe, A., Bozkurt, G., Catapano, J. et al. Intrathecal transplantation of stem cells by lumbar puncture for thoracic spinal cord injury in the rat. Spinal Cord 49, 967–973 (2011). https://doi.org/10.1038/sc.2011.46
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DOI: https://doi.org/10.1038/sc.2011.46
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