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Uptake of functionalized, fluorescent-labeled polymeric particles in different cell lines and stem cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
11446 741 2006 9 PDF Available
Title
Uptake of functionalized, fluorescent-labeled polymeric particles in different cell lines and stem cells
Abstract

Labeling of cells with particles for in-vivo detection is interesting for various biomedical applications. The objective of this study was to evaluate the feasibility and efficiency labeling of cells with polymeric particles without the use of transfection agents. We hypothesized that surface charge would influence cellular uptake. The submicron particles were synthesized by the miniemulsion process. A fluorescent dye which served as reporter was embedded in these particles. The surface charge was varied by adjusting the amount of copolymerized monomer with amino group thus enabling to study the cellular uptake in correlation to the surface charge. Fluorescent-activated cell sorter (FACS) measurements were performed for detecting the uptake of the particles or attachment of particles in mesenchymal stem cells (MSC), and the three cell lines HeLa, Jurkat, and KG1a. These cell lines were chosen as they can serve as models for clinically interesting cellular targets. For these cell lines—with the exception of MSCs—a clear correlation of surface charge and fluorescence intensity could be shown. For an efficient uptake of the submicron particles, no transfection agents were needed. Confocal laser scanning microscopy and transmission electron microscopy (TEM) revealed differences in subcellular localization of the particles. In MSCs and HeLa particles were mostly located inside of cellular compartments resembling endosomes, while in Jurkat and KG1a, nanoparticles were predominantly located in clusters on the cell surface. Scanning electron microscopy showed microvilli to be involved in this process.

Keywords
Particle; Fluorescence; Cell uptake; Surface modification; Mesenchymal stem cell; FACS; SEM; TEM; Confocal microscopy
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Uptake of functionalized, fluorescent-labeled polymeric particles in different cell lines and stem cells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 27, Issue 14, May 2006, Pages 2820–2828
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