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Total 281 results found since Jan 2013.

Trilayer micelles for combination delivery of rapamycin and siRNA targeting Y-box binding protein-1 (siYB-1).
In this study, it has been shown that PCL can encapsulate RAP with high loading efficiencies, and PAsp(DET) can successfully interact with siRNA for efficient transfection/knockdown with negligible cytotoxicity. The enhanced therapeutic efficacy of RAP/siYB-1 micelles was demonstrated in cell cultures and in a PC3 xenograft nude mouse model of human prostate cancer. Herein, we demonstrate that trilayer micelles are a promising approach to improve the simultaneous delivery of combination siRNA/drug therapies. PMID: 23768780 [PubMed - as supplied by publisher]
Source: Biomaterials - June 11, 2013 Category: Materials Science Authors: Zeng S, Xiong MP Tags: Biomaterials Source Type: research

A review of the current status of siRNA nanomedicines in the treatment of cancer.
Abstract RNA interference currently offers new opportunities for gene therapy by the specific extinction of targeted gene(s) in cancer diseases. However, the main challenge for nucleic acid delivery still remains its efficacy through intravenous administration. Over the last decade, many delivery systems have been developed and optimized to encapsulate siRNA and to specifically promote their delivery into tumor cells and improve their pharmacokinetics for anti-cancer purposes. This review aims to sum up the potential targets in numerous pathways and the properties of recently optimized siRNA synthetic nanomedicine...
Source: Biomaterials - May 30, 2013 Category: Materials Science Authors: Resnier P, Montier T, Mathieu V, Benoit JP, Passirani C Tags: Biomaterials Source Type: research

Imaging and therapy of liver fibrosis using bioreducible polyethylenimine/siRNA complexes conjugated with N-acetylglucosamine as a targeting moiety.
Abstract Diagnosis and therapy of early stage liver fibrosis is very important for the treatment of fatal liver diseases. Here, we report on the targeted imaging and therapy of activated hepatic stellate cells (HSCs) and fibrotic liver tissue using N-acetylglucosamine (GlcNAc)- and indocyanine green (ICG)-conjugated PEI/siRNA complexes. The conjugation of a disulfide bond to PEI (PEI-D) was achieved by Michael addition. We modified PEI with N-acetylglucosamine (PEI-D-GlcNAc), which can specifically interact with desmin on activated HSCs, using the EDC coupling method. Confocal microscopic analysis showed that the ...
Source: Biomaterials - May 28, 2013 Category: Materials Science Authors: Kim SJ, Ise H, Kim E, Goto M, Akaike T, Chung BH Tags: Biomaterials Source Type: research

A review of nanotechnological approaches for the prophylaxis of HIV/AIDS.
Abstract Successful treatment and control of HIV/AIDS is one of the biggest challenges of 21st century. More than 33 million individuals are infected with HIV worldwide and more than 2 million new cases of HIV infection have been reported. The situation demands development of effective prevention strategies to control the pandemic of AIDS. Due to lack of availability of an effective HIV vaccine, antiretroviral drugs and nucleic acid therapeutics like siRNA have been explored for HIV prophylaxis. Clinical trials shave shown that antiretroviral drugs, tenofovir and emtricitabine can offer some degree of HIV preventi...
Source: Biomaterials - May 28, 2013 Category: Materials Science Authors: Date AA, Destache CJ Tags: Biomaterials Source Type: research

Protein-resistant, reductively dissociable polyplexes for in vivo systemic delivery and tumor-targeting of siRNA.
Abstract Small interfering RNA (siRNA) has been considered as a very attractive therapeutic alternative to chemical drugs; however, the chemical and biological instability and poor delivery efficiency of siRNA limit its success in clinical applications. Here we report a protein-resistant, reductively dissociable siRNA delivery system based on self-assembled polyelectrolyte complexes of dextran-siRNA conjugates linked by disulfide bonds. The prepared polyplexes exhibit excellent dispersion stability in the presence of serum because of the anti-fouling property of dextran exposed onto the complex surface. The enzyma...
Source: Biomaterials - January 30, 2013 Category: Materials Science Authors: Kim JS, Oh MH, Park JY, Park TG, Nam YS Tags: Biomaterials Source Type: research

Gold-nanobeacons for simultaneous gene specific silencing and intracellular tracking of the silencing events.
Abstract The potential of a single molecular nanoconjugate to intersect all RNA pathways: from gene specific downregulation to silencing the silencers, i.e. siRNA and miRNA pathways, is demonstrated. Gold-nanobeacons are capable of efficiently silencing single gene expression, exogenous siRNA and endogenous miRNAs while yielding a quantifiable fluorescence signal directly proportional to the level of silencing. The silencing potential is comparable to that of traditional siRNA but the same nanoconjugates structure is also capable of reversing the effect of an exogenous siRNA. We further demonstrate the Gold-nanobe...
Source: Biomaterials - January 30, 2013 Category: Materials Science Authors: Conde J, Rosa J, de la Fuente JM, Baptista PV Tags: Biomaterials Source Type: research

Cellular internalization and gene silencing of siRNA polyplexes by cytocleavable cationic polyrotaxanes with tailored rigid backbones.
Abstract To achieve successful delivery of siRNA therapeutics, cytocleavable cationic polyrotaxanes (PRXs) composed of N,N-dimethylaminoethyl (DMAE) group-modified α-cyclodextrins (CDs) that were threaded onto a poly(ethylene glycol) (PEG) axis and capped with a bulky stopper using cytocleavable disulfide linkages (DMAE-PRX) were utilized as an siRNA carrier. DMAE-PRXs with various numbers of threading CDs and modified DMAE groups were synthesized, and the physicochemical properties, cellular internalization, and gene silencing activity of DMAE-PRX/siRNA were investigated to elucidate the relationship between its...
Source: Biomaterials - January 30, 2013 Category: Materials Science Authors: Tamura A, Yui N Tags: Biomaterials Source Type: research

Triblock Copolymer-Encapsulated Nanoparticles with Outstanding Colloidal Stability for siRNA Delivery
ACS Applied Materials & InterfacesDOI: 10.1021/am3021813
Source: ACS Applied Materials and Interfaces - January 15, 2013 Category: Materials Science Authors: Jian Qian and Xiaohu Gao Source Type: research

Stabilizing effect of tyrosine trimers on pDNA and siRNA polyplexes.
Abstract Nine sequence-defined, polycationic oligomers were synthesized containing motifs of three consecutive tyrosines (Y3) as stabilizing components for pDNA and siRNA polyplex assembly. For pDNA, a combination of terminal oligotyrosines and cysteines was necessary and sufficient for stable polyplex formation. Stable siRNA binding required a combination of terminal cysteines and oligotyrosines, as well as a central hydrophobic modification (oligotyrosines or fatty acids). The phenolic group within the aromatic amino acids of Y3 containing oligomers further increased the endosomal buffer capacity. As a result, t...
Source: Biomaterials - January 4, 2013 Category: Materials Science Authors: Troiber C, Edinger D, Kos P, Schreiner L, Kläger R, Herrmann A, Wagner E Tags: Biomaterials Source Type: research

RNAi functionalized collagen-chitosan/silicone membrane bilayer dermal equivalent for full-thickness skin regeneration with inhibited scarring.
Abstract Scar inhibition of dermal equivalent is one of the key issues for treatment of full thickness skin defects. To yield a bioactive RNAi functionalized matrix for skin regeneration with inhibited scarring, collagen-chitosan/silicone membrane bilayer dermal equivalent (BDE) was combined with trimetylchitosan (TMC)/siRNA complexes which could induce suppression of transforming growth factor-β1 (TGF-β1) pathway. The RNAi-BDE functioned as a reservoir for the incorporated TMC/siRNA complexes, enabling a prolonged siRNA release. The seeded fibroblasts in the RNAi-BDE showed good viability, internalized the TMC/...
Source: Biomaterials - January 4, 2013 Category: Materials Science Authors: Liu X, Ma L, Liang J, Zhang B, Teng J, Gao C Tags: Biomaterials Source Type: research

In vivo disassembly of IV administered siRNA matrix nanoparticles at the renal filtration barrier.
In this report, the biodistribution in mice of siRNA loaded dextran nanogels was investigated in detail. Both single photon emission computed tomography (SPECT) imaging and fluorescence single particle tracking (fSPT) indicate that the particles are rapidly cleared from the circulation. PEGylation of the nanogels was not able to increase the half-life in the bloodstream. Carrier disassembly in the systemic circulation and phagocytic clearance are known to facilitate the elimination of siRNA nanoparticles. Additionally, it is demonstrated for dextran nanogels that also the kidneys play an important role in their elimination...
Source: Biomaterials - December 19, 2012 Category: Materials Science Authors: Naeye B, Deschout H, Caveliers V, Descamps B, Braeckmans K, Vanhove C, Demeester J, Lahoutte T, De Smedt SC, Raemdonck K Tags: Biomaterials Source Type: research