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Neural Stem Cells Modified by a Hypoxia-Inducible VEGF Gene Expression System Improve Cell Viability under Hypoxic Conditions and Spinal Cord Injury

Title
Neural Stem Cells Modified by a Hypoxia-Inducible VEGF Gene Expression System Improve Cell Viability under Hypoxic Conditions and Spinal Cord Injury
Author
이민형
Keywords
hypoxia-inducible gene expression system; neural stem cells; vascular endothelial growth factor; spinal cord injury
Issue Date
2011-05
Publisher
J B LIPPINCOTT CO
Citation
Spine, Vol.36 No.11 [2011], 857-864
Abstract
Study Design. An in vitro neural hypoxia model and rat spinal cord injury (SCI) model were used to assess the regulation of therapeutic vascular endothelial growth factor (VEGF) gene expression in mouse neural stem cells (mNSCs) by the EPO (erythropoietin) enhancer or RTP801 promoter. Objective. To increase VEGF gene expression in mNSCs under hypoxic conditions in SCI lesions but avoid unwanted overexpression of VEGF in normal sites, we developed a hypoxia-inducible gene expression system consisting of the EPO enhancer and RTP801 promoter fused to VEGF or the luciferase gene, then transfected into mNSCs. Summary of Background Data. On the basis of the ischemic response in the injured area, poor cell survival at the transplantation site is a consistent problem with NSC transplantation after SCI. Although VEGF directly protects neurons and enhances neurite outgrowth, uncontrolled overexpression of VEGF in uninjured tissue may cause serious adverse effects. To effectively improve NSC survival in ischemic sites after transplantation, we evaluated mNSCs modified by a hypoxia-inducible VEGF gene expression system in an SCI model. Methods. Hypoxia-inducible luciferase or VEGF plasmids were constructed using the EPO enhancer or RTP801 promoter. The effect of these systems on targeted gene expression and cell viability was evaluated in mNSCs in both hypoxic in vitro injury and a rat SCI model in vivo. Results. The gene expression system containing the EPO enhancer or RTP801 promoter significantly increased the expression of the luciferase reporter gene and therapeutic VEGF gene under hypoxic conditions. The Epo-SV-VEGF plasmid transfection group had significantly fewer apoptotic cells in vitro. This system also augmented cell viability in the in vivo SCI model. Conclusion. These results strongly suggest the potential utility of mNSCs modified by a hypoxia-inducible VEGF gene expression system in the development of effective stem cell transplantation protocols in SCI.
URI
http://insights.ovid.com/crossref?an=00007632-201105150-00005
ISSN
0362-2436; 1528-1159
DOI
10.1097/BRS.0b013e3181e7f34b
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > BIOENGINEERING(생명공학과) > Articles
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