title: Monitoring the disassembly of siRNA polyplexes in serum is crucial for predicting their biological efficacy.
abstract: To exploit the full therapeutic potential of short interfering RNA (siRNA), efficient delivery vehicles are needed as siRNA fails to enter cells spontaneously. Such carriers should also protect siRNA against degradation while it is on its way to the cytosol of the target cells. Cationic polymers are widely investigated as siRNA carriers. Cationic polymers and siRNA self-assemble into siRNA polyplexes which have been shown to silence genes in cell cultures. While siRNA polyplexes will become exposed to full blood after intravenous injection, in vitro gene knockdown is mostly evaluated in serum free media or media containing only a few percent of serum. Little knowledge is currently available on the stability of siRNA polyplexes in blood, while there are no methods available which allow a quantitative measurement of the disassembly of nucleic acid containing nanoparticles in such complex biological media. This paper shows that fluorescence fluctuation spectroscopy allows us to quantitatively monitor the disassembly of siRNA containing nanoparticles in full serum. It further shows that the gene silencing efficacy of siRNA polyplexes in serum containing media can be very well explained by their disassembling behavior in these media. Our findings are important for the further development of siRNA polyplexes and also other nanoparticulate nucleic acid delivery systems.
authors.affiliation: Laboratory of General Biochemistry and Physical Pharmacy, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium.
authors.forename: Kevin
authors.initials: K
authors.lastname: Buyens
authors.forename: Martin
authors.initials: M
authors.lastname: Meyer
authors.forename: Ernst
authors.initials: E
authors.lastname: Wagner
authors.forename: Joseph
authors.initials: J
authors.lastname: Demeester
authors.forename: Stefaan C
authors.initials: SC
authors.lastname: De Smedt
authors.forename: Niek N
authors.initials: NN
authors.lastname: Sanders
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry*; D016503:Drug Delivery Systems; D004355:Drug Stability; D015870:Gene Expression; D020868:Gene Silencing; D049409:Luciferases, Firefly / Q000235:genetics; D053758:Nanoparticles / Q000737:chemistry*; D011237:Predictive Value of Tests; D034741:RNA, Small Interfering / Q000008:administration & dosage / Q000097:blood* / Q000235:genetics; D013050:Spectrometry, Fluorescence
chemical_list: D001672:Biocompatible Materials; D004337:Drug Carriers; D034741:RNA, Small Interfering; D049409:Luciferases, Firefly