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Patterned transgene expression in multiple-channel bridges after spinal cord injury

Paper ID Volume ID Publish Year Pages File Format Full-Text
2249 107 2010 9 PDF Available
Title
Patterned transgene expression in multiple-channel bridges after spinal cord injury
Abstract

Patterning of gene delivery on sub-millimeter length scales within tissue engineering scaffolds is fundamental to recreating the complex architectures of tissues. Surface-mediated delivery of lipoplexes mixed with fibronectin was investigated to pattern vectors within 250 μm channels in poly(lactide-co-glycolide) (PLG) bridges. Initial studies performed in vitro on PLG surfaces indicated that a DNA density of 0.07 μg mm–2 inside each channel with a weight ratio of DNA to fibronectin of 1:20 maximized the number of transfected cells and the levels of transgene expression. Patterned vectors encoding for nerve growth factor (NGF) resulted in localized neurite extension within the channel. Translation to three-dimensional multiple-channel bridges enabled patterned transfection of different vectors throughout the channels for DNA:fibronectin ratios of 1:4 and multiple DNA depositions, with a large increase of neural cell bodies and neurite extension for delivery of DNA encoding for NGF. In vivo, the immobilization of non-viral vectors within the channels resulted in localized transfection within the pore structure of the bridge immediately around the channels of the bridge containing DNA. This surface immobilization strategy enables patterned gene delivery in vitro and in vivo on length scales of hundreds of microns and may find utility in strategies aimed at regenerating tissues with complex architectures.

Keywords
Spatial patterning; Gene therapy; Spinal cord; Regenerative medicine; Lipoplexes
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Patterned transgene expression in multiple-channel bridges after spinal cord injury
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 8, August 2010, Pages 2889–2897
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us