Journal
JOURNAL OF CONTROLLED RELEASE
Volume 148, Issue 1, Pages 106-109Publisher
ELSEVIER
DOI: 10.1016/j.jconrel.2010.06.019
Keywords
siRNA; Fluorescence; Quantitative uptake; Quenching; Polyplex; Lipoplex
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Efficient intracellular delivery of siRNA is a significant hurdle to its therapeutic success. For biological studies on the efficiency of carrier-mediated uptake of siRNA, quantitative determination of the amount of internalized siRNA is required. In this study, when the apparent uptake of fluorescently labeled siRNA, formulated in different lipo- and polyplexes, was examined using different techniques, major differences were observed. Additional experiments showed that these differences could be explained by quenching phenomena that were dependent on interactions between siRNA and carrier and their intracellular environment. Differences in fluorescent signal of complexed siRNA due to quenching could be overcome by measuring the fluorescent signal after lysing the transfected cells in lysis buffer that contained 2% SDS to dissociate siRNA from the complexes. This method offers a simple approach for quantifying cellular uptake of siRNA, which might help in the development of more efficient delivery systems. (C) 2010 Elsevier B.V. All rights reserved.
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