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Total 281 results found since Jan 2013.

In vivo delivery of functional Flightless I siRNA using layer-by-layer polymer surface modification
This study aimed to investigate whether layer-by-layer polymer surface modification could deliver small interfering RNA to decrease fibrotic processes associated with medical device implantation. Anti-green fluorescent protein labelled small interfering RNA was applied to tissue culture plates and polyurethane using a layer-by-layer technique with small interfering RNA and poly-L-lysine. In vitro studies showed that the level of down-regulation of green fluorescent protein was directly related to the number of coatings applied. This layer-by-layer coating technique was then used to generate Rhodamine-Flii small interf...
Source: Journal of Biomaterials Applications - September 21, 2015 Category: Materials Science Authors: Martens, P. J., Ly, M., Adams, D. H., Penzkover, K. R., Strudwick, X., Cowin, A. J., Poole-Warren, L. A. Tags: Biomaterials Processing Source Type: research

Co-delivery of platinum drug and siNotch1 with micelleplex for enhanced hepatocellular carcinoma therapy.
Abstract As part of HCC tumor cellularity, cancer stem cells (CSCs) are considered a major obstacle to eradicate hepatocellular carcinoma (HCC), which is the third most common cause of cancer-related death worldwide, and the accumulation of chemotherapeutic drug-resistant CSCs invariably accounts for poor prognosis and HCC relapse. In the present study, we explored the efficacy of co-delivery of platinum drug and siRNA targeting Notch1 to treat CSCs-harboring HCC. To overcome the challenging obstacles of platinum drug and siRNA in the systemic administration, we developed a micellar nanoparticle (MNP) to deliver p...
Source: Biomaterials - August 17, 2015 Category: Materials Science Authors: Shen S, Sun CY, Du XJ, Li HJ, Liu Y, Xia JX, Zhu YH, Wang J Tags: Biomaterials Source Type: research

RNAi nanomaterials targeting immune cells as an anti-tumor therapy: the missing link in cancer treatment?
Publication date: Available online 15 August 2015 Source:Materials Today Author(s): João Conde, Christina E. Arnold, Furong Tian, Natalie Artzi siRNA delivery targeting tumor cells and cancer-associated immune cells has been gaining momentum in the last few years. A combinatorial approach for silencing crucial factors essential for tumor progression in cancer-associated immune cells and in cancer cells simultaneously can effectively shift the tumor microenvironment from pro-oncogenic to anti-tumoral. Gene-therapy using RNAi nanomaterials can help shift this balance; however, fully utilizing the potential of RNAi rel...
Source: Materials Today - August 15, 2015 Category: Materials Science Source Type: research

Modulation of inflammation and angiogenesis and changes in ECM GAG-activity via dual delivery of nucleic acids.
Abstract Tissue-engineered organs and implants hold promise for the replacement of damaged and diseased organs. However, the foreign body response (FBR) is a major obstacle that compromises the function of tissue-engineered constructs, typically causing them to fail. Two components of FBR are an inflammatory response and a lack of vascularization. To overcome these limitations, a collagen system was developed to release interleukin-6 (IL-6) siRNA and endothelial nitric oxide synthase (eNOS) pDNA in a staggered manner. Hollow collagen microspheres were assembled into a collagen sphere-in-hydrogel system that displa...
Source: Biomaterials - August 6, 2015 Category: Materials Science Authors: Browne S, Monaghan MG, Brauchle E, Berrio DC, Chantepie S, Papy-Garcia D, Schenke-Layland K, Pandit A Tags: Biomaterials Source Type: research

PAMAM dendrimers as promising nanocarriers for RNAi therapeutics
Publication date: Available online 26 July 2015 Source:Materials Today Author(s): Prashant Kesharwani, Sanjeev Banerjee, Umesh Gupta, Mohd Cairul Iqbal Mohd Amin, Subhash Padhye, Fazlul H. Sarkar, Arun K. Iyer Therapeutics based on RNA interference mechanisms are highly promising for the management of several diseases including multi-drug resistant cancers. However, effective delivery of siRNAs and oligonucleotides still remains challenging. In this regard, hyper-branched, PAMAM dendrimers having unique three-dimensional architecture and nanoscale size, with cationic surface charge can potentially serve as siRNA c...
Source: Materials Today - July 27, 2015 Category: Materials Science Source Type: research

Regulation of vascular smooth muscle cell autophagy by DNA nanotube-conjugated mTOR siRNA.
Abstract The efficient delivery of short interfering RNA (siRNA) is an enormous challenge in the field of gene therapy. Herein, we report a delivery nanosystem based on programmed DNA self-assembly mammalian target of rapamycin (mTOR) siRNA-loaded DNA nanotubes (DNA-NTs). We demonstrate that these siRNA-DNA-NTs can be effectively transfected into pulmonary arterial smooth muscle cells (PASMCs) via endocytosis; and that the loaded mTOR siRNA can induce obvious autophagy and inhibit cell growth under both normal and hypoxic conditions. Moreover, we found that mTOR siRNA can control the autophagy and proliferation of...
Source: Biomaterials - July 16, 2015 Category: Materials Science Authors: You Z, Qian H, Wang C, He B, Yan J, Mao C, Wang G Tags: Biomaterials Source Type: research

The use of collagen-based scaffolds to simulate prostate cancer bone metastases with potential for evaluating delivery of nanoparticulate gene therapeutics.
In conclusion, development of a novel 3D cell culture model of prostate cancer bone metastasis has been initiated resulting, for the first time, in the successful delivery of gene therapeutics in a 3D in vitro model. Further enhancement of this model will help elucidate the pathogenesis of prostate cancer and also accelerate the design of effective therapies which can penetrate into the bone microenvironment for prostate cancer therapy. PMID: 26196533 [PubMed - as supplied by publisher]
Source: Biomaterials - July 14, 2015 Category: Materials Science Authors: Fitzgerald KA, Guo J, Tierney EG, Curtin CM, Malhotra M, Darcy R, O'Brien FJ, O'Driscoll CM Tags: Biomaterials Source Type: research

Dermal delivery of HSP47 siRNA with NOX4-modulating mesoporous silica-based nanoparticles for treating fibrosis.
Abstract Fibrotic diseases such as scleroderma have been linked to increased oxidative stress and upregulation of pro-fibrotic genes. Recent work suggests a role of NADPH oxidase 4 (NOX4) and heat shock protein 47 (HSP47) in inducing excessive collagen synthesis, leading to fibrotic diseases. Herein, we elucidate the relationship between NOX4 and HSP47 in fibrogenesis and propose to modulate them altogether as a new strategy to treat fibrosis. We developed a nanoparticle platform consisting of polyethylenimine (PEI) and polyethylene glycol (PEG) coating on a 50-nm mesoporous silica nanoparticle (MSNP) core. The na...
Source: Biomaterials - July 10, 2015 Category: Materials Science Authors: Morry J, Ngamcherdtrakul W, Gu S, Goodyear SM, Castro DJ, Reda MM, Sangvanich T, Yantasee W Tags: Biomaterials Source Type: research

Acute in Vivo Toxicity Mitigation of PEI-Coated Maghemite Nanoparticles Using Controlled Oxidation and Surface Modifications toward siRNA Delivery
ACS Applied Materials & InterfacesDOI: 10.1021/acsami.5b02743
Source: ACS Applied Materials and Interfaces - July 9, 2015 Category: Materials Science Authors: Liron Limor Israel, Emmanuel Lellouche, Stella Ostrovsky, Valeria Yarmiayev, Moshe Bechor, Shulamit Michaeli and Jean-Paul (Moshe) Lellouche Source Type: research

Gene Transfer Potential of a Lipofuscin Fluorophore, A2E
Publication date: 2015 Source:Materials Today: Proceedings, Volume 2, Issue 1 Author(s): Susana Machado , Liji Raju , Michael D. Pungente Cationic lipids are promising, potentially safer cellular delivery carriers of therapeutic nucleic acids compared to the more effective viral vectors. The key to improving the effectiveness of non-viral agents is unlocking the still unsolved mechanism behind lipid gene delivery. Important considerations for the development of new delivery agents are enhanced uptake efficiency, low toxicity and traceability. Our objective was to assay the DNA complexation and in vitro delivery efficienc...
Source: Materials Today: Proceedings - June 6, 2015 Category: Materials Science Source Type: research

Gold nanorod delivery of LSD1 siRNA induces human mesenchymal stem cell differentiation
In this study, we have developed poly-sodium 4-styrenesulfonate (PSS) and poly-allylamine hydrochloride (PAH) coated AuNR-based nanocarriers, which are capable of delivering small interfering RNA (siRNA) against LSD1 to induce the differentiation of human mesenchymal stem cells. To further study the mechanism, we tested the stemness and differentiation genes and found that they have been changed with LSD1 down-regulation. In addition, with the hepatocyte growth factor (HGF), LSD1 siRNA delivery by AuNRs could promote the differentiation of the human mesenchymal stem cells (human MSCs) into a hepatocyte lineage in vitro. Ou...
Source: Materials Science and Engineering: C - May 15, 2015 Category: Materials Science Source Type: research

Single-component self-assembled RNAi nanoparticles functionalized with tumor-targeting iNGR delivering abundant siRNA for efficient glioma therapy.
In this study, a novel glioma-targeting RNAi system was developed. Single-component RNAi nanospheres were tactfully self-assembled in vitro, combining the carrier and cargo as a whole. An artificially synthesized polycation (pOEI) with redox-sensitive disulfides in structure condensed the RNAi nanospheres into more compacted nanoparticles. Then a novelly designed tumor-homing and penetrating cyclopeptide iNGR was further modified on the surface. iNGR modified RNAi nanoparticles demonstrated significantly enhanced accumulation in glioma site, remaining stable in circulation until the release of naked RNAi nanospheres were ...
Source: Biomaterials - April 24, 2015 Category: Materials Science Authors: An S, Jiang X, Shi J, He X, Li J, Guo Y, Zhang Y, Ma H, Lu Y, Jiang C Tags: Biomaterials Source Type: research

Enhanced Therapeutic siRNA to Tumor Cells by a pH-Sensitive Agmatine–Chitosan Bioconjugate
ACS Applied Materials & InterfacesDOI: 10.1021/acsami.5b00851
Source: ACS Applied Materials and Interfaces - April 8, 2015 Category: Materials Science Authors: Yongmao Li, Jianhai Yang, Bing Xu, Fei Gao, Wei Wang and Wenguang Liu Source Type: research

Effects of mannose density on in vitro and in vivo cellular uptake and RNAi efficiency of polymeric nanoparticles.
Abstract To evaluate the effects of mannose density on in vitro and in vivo cellular uptake and RNA interference (RNAi) efficiency of polymeric nanoparticles (NPs) in macrophages, mannose-modified trimethyl chitosan-cysteine (MTC) conjugates with mannose densities of 4%, 13%, and 21% (MTC-4, MTC-13, and MTC-21) were synthesized. Tumor necrosis factor-alpha (TNF-α) siRNA loaded MTC NPs with particle sizes of ∼150 nm exhibited desired structural stability and effectively protected siRNA from enzymatic degradation. Generally, cellular uptake and RNAi efficiency were affected by mannose density. As expected, MTC...
Source: Biomaterials - April 1, 2015 Category: Materials Science Authors: Chu S, Tang C, Yin C Tags: Biomaterials Source Type: research

Targeting glucose uptake with siRNA-based nanomedicine for cancer therapy.
In this study, we report an effective strategy for cancer therapy through targeting glucose transporter 3 (GLUT3) with siRNA-based nanomedicine to simultaneously inhibit the self-renewal of glioma stem cells and bulk glioma cells in a glucose restricted tumor micro-environment. We have demonstrated that cationic lipid-assisted poly(ethylene glycol)-b-poly(d,l-lactide) (PEG-PLA) nanoparticles can efficiently deliver siRNA into U87MG and U251 glioma stem cells and bulk glioma cells. Nanoparticles carrying specific siRNA targeting GLUT3 (NPsiGLUT3) were able to significantly reduce the expression of GLUT3 in glioma stem cells...
Source: Biomaterials - March 20, 2015 Category: Materials Science Authors: Xu CF, Liu Y, Shen S, Zhu YH, Wang J Tags: Biomaterials Source Type: research