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Behr J.-P.,University of Strasbourg | Behr J.-P.,Polyplus-transfection
Accounts of Chemical Research | Year: 2012

The discovery of RNA interference has given a new lease on life to both the chemistry of oligonucleotides and chemical approaches for the intracellular delivery of nucleic acids. In particular, delivery of siRNA, whether in vitro for screening and target validation purposes or in humans as a new class of drugs, may revolutionize our approach to therapy. Their impact could equal that of the bioproduction and various uses of monoclonal antibodies today. Unfortunately, global pharmaceutical companies again seem to be waiting to buy the next Genentech or Genzyme of gene silencing rather than investing research and development into this promising area of research.Gene silencing encounters barriers similar to gene addition and hence may benefit from the extra decade of experience brought by gene therapy. "Chemical" transfection of cells in culture has become routine, and this Account discusses some of the reasons this success has not extended to nonviral gene therapy trials, most of which do not progress beyond the phase 2 stage. The author also discusses a (much debated) mechanism of nucleic acid cell entry and subsequent release of the polycationic particles into the cytoplasm. Both topics should be useful to those interested in delivery of siRNA.The move from gene therapy toward siRNA as an oligonucleotide-based therapy strategy provides a much wider range of druggable targets. Even though these molecules are a hundredfold smaller than a gene, they are delivered via similar cellular mechanisms. Their complexes with cationic polymers are less stable than those with a higher number of phosphate groups, which may be compensated by siRNA concatemerization or by chemical conjugation with the cationic carrier. Thus chemistry is again desperately needed. © 2012 American Chemical Society.

Liu X.,CNRS Interdisciplinary Center on Nanoscience in Marseille | Liu X.,Wuhan University | Wu J.,CNRS Interdisciplinary Center on Nanoscience in Marseille | Wu J.,Wuhan University | And 13 more authors.
Bioconjugate Chemistry | Year: 2011

With the aim of developing dendrimer nanovectors with a precisely controlled architecture and flexible structure for DNA transfection, we designed PAMAM dendrimers bearing a triethanolamine (TEA) core, with branching units pointing away from the center to create void spaces, reduce steric congestion, and increase water accessibility for the benefit of DNA delivery. These dendrimers are shown to form stable nanoparticles with DNA, promote cell uptake mainly via macropinocytosis, and act as effective nanovectors for DNA transfection in vitro on epithelial and fibroblast cells and, most importantly, in vivo in the mouse thymus, an exceedingly challenging organ for immune gene therapy. Collectively, these results validate our rational design approach of structurally flexible dendrimers with a chemically defined structure as effective nanovectors for gene delivery, and demonstrate the potential of these dendrimers in intrathymus gene delivery for future applications in immune gene therapy. © 2011 American Chemical Society.

Polyplus-transfection | Date: 2010-12-22

The invention relates to a method for the production of recombinant proteins by eucaryotic cells in synthetic culture media, wherein said eucaryotic cells are transfected with a composition comprising a synthetic transfection reagent based on a polyhydroxylated polyalkyleneimine.

Polyplus-transfection | Date: 2014-07-01

The invention relates to compositions comprising double-stranded oligonucleotides of identical or different sequences and/or length, said oligonucleotides having sequences

Bonnet M.-E.,Polyplus-transfection | Gossart J.-B.,Polyplus-transfection | Benoit E.,Polyplus-transfection | Messmer M.,IBMC | And 8 more authors.
Journal of Controlled Release | Year: 2013

RNA interference allows the design of new inhibitors that target deregulated pathways in cancer. However systemic delivery of siRNA for the treatment of solid tumors still remains an issue. In our study, in order to suppress the progression of lung cancer metastasis in mice, we developed sticky siRNA (ssiRNA) to inhibit survivin and cyclin B1, two candidates involved in cell survival and proliferation. We exploited the linear polyethylenimine (PEI) as potent non-viral carrier to efficiently deliver our inhibitors. As a proof of concept, we have chosen a very aggressive mammary adenocarcinoma model (TSA-Luc cells), which forms lung metastases upon systemic cell injection. We confirmed in vitro, that the ssiRNAs delivered with PEI are not only able to inhibit our target genes at the mRNA and protein levels, but are also able to block the cell cycle and cell proliferation through a mechanism of RNA interference. More importantly, we showed in vivo by luciferase dosage, bioimaging and tissue section, an inhibition of lung tumor metastases after systemic delivery of cyclin B1 and survivin ssiRNA complexed with PEI. Alternating treatment with cisplatin and ssiRNA/PEI showed an additive effect between the two anticancer drugs on lung tumor inhibition leading to a significant increase in animal survival. Moreover a promising window between activity (IC50) and toxic-ity (LD50), essential for therapeutic application, was observed. Our data show that systemic delivery of ssiRNA/PEI complexes targeting the cell cycle is a valuable strategy for the treatment of lung tumor metastasis and that it can be combined with chemotherapy. © 2013 Elsevier B.V. All rights reserved.

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