期刊
JOURNAL OF NEUROSCIENCE RESEARCH
卷 87, 期 14, 页码 3186-3197出版社
WILEY
DOI: 10.1002/jnr.22149
关键词
spinal cord trauma; prosurvival gene; rat; locomotor recovery; neurotrophin
资金
- Korea Research Foundation funded by the Korean Government (MEST
- Basic Research Promotion Fund) [KRF-2006-E00439]
- Ajou University School of Medicine
- KOSEF through Chronic Inflammatory Disease Research Cente [R13-2003-019]
- KOSEF/Brain Disease Research Center, Ajou University [M103KV010026]
- Frontier Science Program
Transplantation of neural stem cells (NSCs) has shown promise for improving functional recovery after spinal cord injury (SCI). The inhospitable milieu of injured spinal cord, however, does not support survival of grafted NSCs, reducing therapeutic efficacy of transplantation. The present study sought to examine whether overexpression of antiapoptotic gene Bcl-X-L in NSCs could promote graft survival and functional recovery following transplantation in rat contusive SCI model. A human NSC line (HB1.F3) was transduced with a retroviral vector encoding Bcl-XL to generate BCl-X-L-overexpressing NSCs (HB1.F3.Bcl-X-L). Overexpression of Bcl-XL conferred resistance to staurosporine-mediated apoptosis. The number of HB1.F3.Bcl-X-L cells was 1.5-fold higher at 2 weeks and 10-fold higher at 7 weeks posttransplantation than that of HB1.F3 cells. There was no decline in the number of HB1.F3.Bcl-X-L cells between 2 and 7 weeks, indicating that Bcl-XL overexpression completely blocked cell death occurring between these two time points. Transplantation of HB1.F3.Bcl-X-L cells improved locomotor scores and enhanced accuracy of hindlimb placement in a grid walk. Approximately 10% of surviving NSCs differentiated into oligodendrocytes. Surviving NSCs produced brain-derived neurotrophic factor (BDNF), and the level of BDNF was significantly increased only in the HB1.F3.Bcl-X-L group. Transplantation of HB1.F3.Bcl-X-L cells reduced cavity volumes and enhanced white matter sparing. Finally, HB1.F3.Bcl-X-L grafts enhanced connectivity between the red nucleus and the spinal cord below the lesion. These results suggest that enhancing graft survival with antiapoptotic gene can potentiate therapeutic benefits of NSC-based therapy for SCI. (C) 2009 Wiley-Liss, Inc.
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