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Total 3372 results found since Jan 2013.

Hybrid lipid–polymer nanoparticles for sustained siRNA delivery and gene silencing
Abstract: The development of controlled-release nanoparticle (NP) technologies has great potential to further improve the therapeutic efficacy of RNA interference (RNAi), by prolonging the release of small interfering RNA (siRNA) for sustained, long-term gene silencing. Herein, we present an NP platform with sustained siRNA-release properties, which can be self-assembled using biodegradable and biocompatible polymers and lipids. The hybrid lipid–polymer NPs showed excellent silencing efficacy, and the temporal release of siRNA from the NPs continued for over one month. When tested on luciferase-expressed HeLa cells and A...
Source: Nanomedicine : Nanotechnology, Biology, and Medicine - March 19, 2014 Category: Nanotechnology Authors: Jinjun Shi, Yingjie Xu, Xiaoyang Xu, Xi Zhu, Eric Pridgen, Jun Wu, Alexander R. Votruba, Archana Swami, Bruce R. Zetter, Omid C. Farokhzad Tags: Pharmacology, Nano-Enabled Drug Delivery, Controlled Release, Polymer-siRNA Hybrid Source Type: research

Abstract 707: Tumor-targeted delivery of siRNA using stabilized calcium phosphate nanoparticles based on bio-inspired hyaluronic acid conjugate
Conclusion Considering its biocompatibility, transfection efficacy, and tumor targeting capability, this stabilized organic-inorganic hybrid gene delivery platform should be considered a promising candidate carrier for systemic siRNA delivery and targeted cancer therapy. Citation Format: Min Sang Lee, Jung Eun Lee, Eunkyoung Byun, Nak Won Kim, Haeshin Lee, Ji Hoon Jeong. Tumor-targeted delivery of siRNA using stabilized calcium phosphate nanoparticles based on bio-inspired hyaluronic acid conjugate. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Di...
Source: Cancer Research - September 30, 2014 Category: Cancer & Oncology Authors: Lee, M. S., Lee, J. E., Byun, E., Kim, N. W., Lee, H., Jeong, J. H. Tags: Experimental and Molecular Therapeutics 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

Novel siRNA Delivery System Using a Ternary Polymer Complex with Strong Silencing Effect and No Cytotoxicity.
Abstract We developed a novel small interfering RNA (siRNA) delivery system using a ternary complex with polyethyleneimine (PEI) and γ-polyglutamic acid (γ-PGA), which showed silencing effect and no cytotoxicity. The binary complexes of siRNA with PEI were approximately 73-102 nm in particle size and 45-52 mV in ζ-potential. The silencing effect of siRNA/PEI complexes increased with an increase of PEI, and siRNA/PEI complexes with a charge ratio greater than 16 showed significant luciferase knockdown in a mouse colon carcinoma cell line regularly expressing luciferase (Colon26/Luc cells). However, strong cy...
Source: Biological and Pharmaceutical Bulletin - August 9, 2014 Category: Drugs & Pharmacology Authors: Kodama Y, Shiokawa Y, Nakamura T, Kurosaki T, Aki K, Nakagawa H, Muro T, Kitahara T, Higuchi N, Sasaki H Tags: Biol Pharm Bull Source Type: research

TPX2 siRNA regulates growth and invasion of esophageal cancer cells
Conclusion siRNA could effectively inhibit the invasion and metastasis of EC9706 cells, promote the apoptosis of tumor cells and may become a new approach for treatment of esophageal carcinoma.
Source: Biomedicine and Pharmacotherapy - November 1, 2014 Category: Drugs & Pharmacology Source Type: research

5'-triphosphate-siRNA activates RIG-I-dependent type I interferon production and enhances inhibition of hepatitis B virus replication in HepG2.2.15 cells.
In conclusion, our findings suggest that 3p-siRNA could act as a powerful bifunctional antiviral molecule with potential for developing a promising therapeutic against chronic HBV infection. PMID: 24099962 [PubMed - as supplied by publisher]
Source: European Journal of Pharmacology - October 4, 2013 Category: Drugs & Pharmacology Authors: Chen X, Qian Y, Yan F, Tu J, Yang X, Xing Y, Chen Z Tags: Eur J Pharmacol Source Type: research

siRNA blocking the RAS signalling pathway and inhibits the growth of oesophageal squamous cell carcinoma in nude mice
The aim of this study was to study RAS‐siRNA blocking RAS pathway and suppressing cell growth in human oesophageal squamous cell carcinoma in nude mice. The methods in this study was to construct RAS‐siRNA expression vector, establish 40 oesophageal squamous cell carcinoma xenograft animal models and divided them into five groups: control group, siRNA control group, RAS‐siRNA group, paclitaxel group and RAS‐siRNA and paclitaxel group. We observed tumour growth in nude mice, studied histology by HE staining, tumour growth inhibition by TUNEL assay and detected the RAS, MAPK and cyclin D1 protein expression by immuno...
Source: Cell Biochemistry and Function - November 28, 2014 Category: Biochemistry Authors: Xinjie Wang, Yuling Zheng, Qingxia Fan, Xudong Zhang, Yonggang Shi Tags: Research Article Source Type: research

siRNA targeting RBP2 inhibits expression, proliferation, tumorigenicity and invasion in thyroid carcinoma cells.
In conclusion, the transfection of RBP2-siRNA into papillary thyroid carcinoma K1 cells suppressed the expression of RBP2 in these cells, and reduced their proliferation, invasion, migration and tumorigenic potential. Therefore, targeting RBP2 may be an efficient approach to control thyroid carcinoma. PMID: 26788140 [PubMed - as supplied by publisher]
Source: Oncology Letters - January 21, 2016 Category: Cancer & Oncology Tags: Oncol Lett Source Type: research

Cholesterol-grafted chitosan micelles as a nanocarrier system for drug-siRNA co-delivery to the lung cancer cells.
Abstract Combined delivery of a therapeutic small interfering RNA (siRNA) and a chemotherapeutic agent to cancer cells is promising as anticancer therapy, which could offer enhanced cell killing potential and low side effect. However, simultaneous delivery to tumor is challenging. In our study, cholesterol-modified low molecular weight chitosan (MW ~ 15 kDa) was employed as a self-assembled delivery system for both siRNA and a hydrophobic chemotherapeutic agent, curcumin to cancer cells. The siRNA/curcumin loaded nanoparticles (C-CCM/siRNA) were physico-chemically characterized for particle size (165 ± ...
Source: International Journal of Biological Macromolecules - June 25, 2018 Category: Biochemistry Authors: Muddineti OS, Shah A, Rompicharla SVK, Ghosh B, Biswas S Tags: Int J Biol Macromol Source Type: research

Enhanced anticancer effect of doxorubicin by TPGS-coated liposomes with Bcl-2 siRNA-corona for dual suppression of drug resistance
In conclusion, TPGS-coated cationic liposomes with Bcl-2 siRNA corona had the capacity to inhibit MDR dual-pathways and subsequently improved the anti-tumor activity of the chemotherapeutic agent co-delivered to a level that cannot be achieved by inhibiting a MDR single way.Graphical abstract
Source: Asian Journal of Pharmaceutical Sciences - November 13, 2019 Category: Drugs & Pharmacology Source Type: research

Molecules, Vol. 28, Pages 2191: Potential of siRNA-Bearing Subtilosomes in the Treatment of Diethylnitrosamine-Induced Hepatocellular Carcinoma
grawal Mohammad Owais Therapeutics, based on small interfering RNA (siRNA), have demonstrated tremendous potential for treating cancer. However, issues such as non-specific targeting, premature degradation, and the intrinsic toxicity of the siRNA, have to be solved before they are ready for use in translational medicines. To address these challenges, nanotechnology-based tools might help to shield siRNA and ensure its specific delivery to the target site. Besides playing a crucial role in prostaglandin synthesis, the cyclo-oxygenase-2 (COX-2) enzyme has been reported to mediate carcinogenesis in various types of canc...
Source: Molecules - February 27, 2023 Category: Chemistry Authors: Fauzia Jamal Ghufran Ahmed Mohammad Farazuddin Ishrat Altaf Saba Farheen Qamar Zia Asim Azhar Hira Ahmad Aijaz Ahmed Khan Satyanarayana Somavarapu Anshu Agrawal Mohammad Owais Tags: Article Source Type: research

pH-Responsive Dynaplexes as Potent Apoptosis Inductors by Intracellular Delivery of Survivin siRNA
Biomacromolecules. 2023 Jul 31. doi: 10.1021/acs.biomac.3c00424. Online ahead of print.ABSTRACTGene knockdown by siRNA offers an unrestricted choice of targets and specificity based on the principle of complementary Watson-Crick base pairing with mRNA. However, the negative charge, large molecular size, and susceptibility to enzymatic degradation of siRNA impede its successful transfection, hence limiting its potential for therapeutic use. The development of efficient and safe siRNA transfection agents is, therefore, critical for siRNA-based therapy. Herein, we developed a protein-based biodynamic polymer (biodynamer) that...
Source: Biomacromolecules - July 31, 2023 Category: Biochemistry Authors: Yun Liu Salma Ashmawy Lorenz Latta Agnes-Valencia Weiss Alexander F Kiefer Sarah Nasr Brigitta Loretz Anna K H Hirsch Sangeun Lee Claus-Michael Lehr Source Type: research

Superparamagnetic iron oxide nanoparticles mediated 131I-hVEGF siRNA inhibits hepatocellular carcinoma tumor growth in nude mice
Conclusions: EMF-guided 131I-hVEGF siRNA/SilenceMag exhibited an antitumor effect. The synergic therapy of 131I-hVEGF siRNA/SilenceMag might be a promising future treatment option against HCC with the dual functional properties of tumor therapy and imaging.
Source: BMC Cancer - February 21, 2014 Category: Cancer & Oncology Authors: Jing ChenShu ZhuLiangqian TongJiansha LiFei ChenYunfeng HanMing ZhaoWei Xiong Source Type: research

Tumor-penetrating codelivery of siRNA and paclitaxel with ultrasound-responsive nanobubbles hetero-assembled from polymeric micelles and liposomes.
Abstract Drug resistance is a big problem in systemic chemotherapy of hepatocellular carcinoma (HCC), and nanomedicines loaded with both chemotherapeutic agents (e.g. paclitaxel, PTX) and siRNA's targeting antiapoptosis genes (e.g. BCL-2) possess the advantages to simultaneously overcome the efflux pump-mediated drug resistance and antiapoptosis-related drug resistance. However, tumor-penetrating drug delivery with this type of nanomedicines is extremely difficult due to their relatively big size compared to the single drug-loaded nanomedicines. Aiming at address this problem, US-responsive nanobubbles encapsulati...
Source: Biomaterials - April 17, 2014 Category: Materials Science Authors: Yin T, Wang P, Li J, Wang Y, Zheng B, Zheng R, Cheng D, Shuai X Tags: Biomaterials Source Type: research