Interfering Nanoparticles for Silencing MicroRNAs

Program for RNA Biology, Sanford-Burnham Medical Research Institute, La Jolla, California, USA.
Methods in enzymology (Impact Factor: 2.09). 01/2012; 509:339-53. DOI: 10.1016/B978-0-12-391858-1.00017-4
Source: PubMed


MicroRNAs (miRNAs) are single-stranded noncoding RNAs ∼21-nucleotide (nt) in length and regulate gene expression at the posttranscriptional level. miRNAs are involved in almost every area of biology, including developmental processes, disease pathogenesis, and host-pathogen interactions. Dysregulation of miRNAs in various disease states makes them potential targets for therapeutic intervention. Specific miRNAs can be silenced by anti-microRNAs (anti-miRs) that are chemically modified antisense oligonucleotides complementary to mature miRNA sequences. In vivo delivery of anti-miRs is the main barrier in achieving efficient silencing of target miRNAs. A new systemic delivery agent, interfering nanoparticles (iNOPs), was designed and prepared from lipid-functionalized poly-L-lysine dendrimer. iNOPs can efficiently deliver small RNAs, including short interfering RNAs, miRNA mimics, and anti-miRs. Systemic delivery of a chemically stabilized anti-miR-122 by iNOPs effectively silences miR-122 in mouse liver. Intravenous administration of 2 mg/kg anti-miR-122 complexed with iNOP-7 results in 83% specific silencing of target miRNA. The specific silencing of miR-122 by iNOP-7 is long lasting and does not induce an immune response.

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    • "Intravenous administration of interfering nanoparticles (iNOPs), which are prepared by lipid-functionalized poly-L-lysine dendrimer, results in 83% specific silencing of target miRNA. The specific silencing of miR-122 by iNOP-7 is long-lasting and does not induce an immune response [71]. Lipid-based nanoparticles (LNPs) containing oleic acid (OA), an unsaturated fatty acid, also demonstrate the delivery efficacy of miRNA and the inhibition of the target (Bcl-w) to a greater degree than with Lipofectamine 2000 [72]. "
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    ABSTRACT: Intrahepatic portal hypertension accounts for most of the morbidity and mortality encountered in patients with liver cirrhosis, due to increased portal inflow and intrahepatic vascular resistance. Most treatments have focused only on portal inflow or vascular resistance. However, miRNA multitarget regulation therapy may potentially intervene in these two processes for therapeutic benefit in cirrhosis and portal hypertension. This review presents an overview of the most recent knowledge of and future possibilities for the use of miRNA therapy. The benefits of this therapeutic modality-which is poorly applied in the clinical setting-are still uncertain. Increasing the knowledge and current understanding of the roles of miRNAs in the development of intrahepatic portal hypertension and hepatic stellate cells (HSCs) functions, as well as their potential as novel drug targets, is critical.
    04/2014; 2014(12):797898. DOI:10.1155/2014/797898
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    • "Systemic delivery of a chemically stabilized anti-miR-122 by iNOPs into a mouse liver resulted in a long-term inhibition of miR-122 by 83% and did not induce an immune response (Baigude & Rana, 2012). There are only a few reports for using nanoparticlemediated delivery of miRNAs in cardiovascular therapy. "
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    Current Medicinal Chemistry 02/2013; 20(12). DOI:10.2174/0929867311320120007 · 3.85 Impact Factor
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