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Inducing local T cell apoptosis with anti-Fas-functionalized polymeric coatings fabricated via surface-initiated photopolymerizations

Paper ID Volume ID Publish Year Pages File Format Full-Text
8121 578 2010 9 PDF Available
Title
Inducing local T cell apoptosis with anti-Fas-functionalized polymeric coatings fabricated via surface-initiated photopolymerizations
Abstract

Cell encapsulation has long been investigated as a means to achieve transplant immunoprotection as it creates a physical barrier between allograft tissue and host immune cells. Encapsulation with passive barrier materials alone, however, is generally insufficient to protect donor tissue from rejection, because small cytotoxic molecules produced by activated T cells can diffuse readily into the capsule and mediate allograft death. As a means to provide bioactive protection for polymeric encapsulation devices, we investigated a functionalized polymeric coating that mimics a natural T cell regulation pathway. T cells are regulated in vivo via Fas, a well-known ‘death receptor,’ whereby effector cells express Fas ligand and elicit T cell apoptosis upon binding the Fas receptor on a T cell surface. Anti-Fas antibodies are capable of replicating this effect and induce T cell apoptosis in solution. Here, an iniferter-based living radical polymerization was utilized to fabricate surface-anchored polymer chains containing poly(ethylene glycol) with covalently incorporated pendant anti-Fas antibody. Using this reaction mechanism, we demonstrate fabrication conditions that yield surface densities in excess of 1.5 ng/cm2 of incorporated therapeutic, as detected by ELISA. Additionally, we show that coatings containing anti-Fas antibody induced significant T cell apoptosis, 21 ± 2% of cells, after 24 h. Finally, the incorporation of a T cell adhesion ligand, intracellular adhesion molecule-1, along with anti-Fas antibody, yielded even higher levels of apoptosis, 34 ± 1% of T cells, compared to either signal alone.

Keywords
Apoptosis; Immunomodulation; Lymphocyte; Photopolymerization; Surface modification
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Inducing local T cell apoptosis with anti-Fas-functionalized polymeric coatings fabricated via surface-initiated photopolymerizations
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 12, April 2010, Pages 3166–3174
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