|01-05-2011, 04:58 AM||#1|
Join Date: Sep 2004
Neural Stem Cells Modified by a Hypoxia-Inducible VEGF Gene
Spine (Phila Pa 1976). 2010 Dec 29.
Neural Stem Cells Modified by a Hypoxia-Inducible VEGF Gene Expression System Improve Cell Viability under Hypoxic Conditions and Spinal Cord Injury.
Jin HL, Pennant WA, Hyung Lee M, An SS, Kim HA, Liu ML, Oh JS, Cho J, Kim KN, Yoon DH, Ha Y.
*Department of Neurosurgery, Spine and Spinal Cord Institute, Yonsei University College of Medicine, Seoul, Republic of Korea; ‡Department of Bioengineering, College of Engineering, Hanyang University, Seoul, Republic of Korea; ∫Department of Neurosurgery, Konkuk University Medical Center, Seoul, Republic of Korea, †Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea.
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.Objectives. To increase VEGF gene expression in mNSCs under hypoxic conditions in SCI lesions but avoid unwanted over-expression 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. Based on ischemic response in the injured area, poor cell survival at the transplantation site is a consistent problem with NSC transplantation following SCI. Although VEGF directly protects neurons and enhances neurite outgrowth, uncontrolled over-expression of VEGF in uninjured tissue may cause serious adverse effects. To effectively improve NSC survival in ischemic sites following 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.Conclusions. 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.
“As the cast of villains in SCI is vast and collaborative, so too must be the chorus of hero's that rise to meet them” Ramer et al 2005
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