miRCURY LNA miRNA Inhibitors and Power Inhibitors
For miRNA loss-of-function studies using LNA-enhanced antisense miRNA inhibitors
miRCURY LNA miRNA Inhibitors and Power Inhibitors are exceptionally potent, enabling assessment of cellular phenotypes in miRNA loss-of-function studies, even in difficult-to-transfect cell lines. miRCURY LNA miRNA Inhibitor Controls and Power Inhibitor Controls are similar in sequence length and LNA design to the inhibitors and have no homology to any known mouse, rat or human miRNA or mRNA sequence.
miRCURY LNA miRNA Inhibitors and Power Inhibitors are intended for molecular biology applications. These products are not intended for the diagnosis, prevention, or treatment of a disease.
Tm-normalized miRCURY LNA miRNA Inhibitors have unmatched potency against all miRNAs, regardless of their GC content (see figure Examples of miRNA silencing with miRCURY LNA miRNA inhibitors). The Power Inhibitors are so potent that they can be added directly to cell cultures without the need for transfection reagents (see figure miRNA silencing via direct uptake (gymnosis) of Power Inhibitors). In addition, simple systemic administration of LNA-modified in vivo-grade miRNA inhibitors enable analysis of miRNA function in animal models.
miRCURY LNA miRNA Inhibitors are antisense oligonucleotides with perfect sequence complementary to their targets. When introduced into cells, they sequester the target miRNA in highly stable heteroduplexes, effectively preventing the miRNA from hybridizing with its normal cellular interaction partners.
We have exploited the high affinity properties of LNA chemistry to create Tm-normalized miRCURY LNA miRNA Inhibitors and miRCURY LNA miRNA Power Inhibitors. Varying the numbers and positions of LNA nucleotides in these DNA/LNA mixmer inhibitors and carefully choosing the target sequences normalizes the melting temperatures of the oligonucleotides within a narrow window around an empirically determined optimal high temperature (see figure Overall features of the third-generation miRNA inhibitor design). These design features ensure that miRCURY LNA miRNA Inhibitors have the same high efficacy, regardless of the GC content of their miRNA targets.
miRNA silencing without transfection reagents
The combination of LNA and phosphorothioate modifications dramatically improves the stability of miRCURY LNA miRNA Power Inhibitors against enzymatic degradation, so the efficacy of Power Inhibitors is significantly better than the regular inhibitors (see figure Enhanced potency of miRCURY LNA miRNA Power Inhibitors). In fact, they are so stable and potent that they can be added directly to serum-containing culture medium without the need for transfection reagents, providing efficient miRNA inhibition via unassisted "naked" delivery, also known as gymnosis. This allows you to assess the consequences of miRNA silencing without worrying about confounding side effects from the transfection reagents.
Minimal toxicity and off-target effects
The high potency of miRCURY LNA miRNA Inhibitors and miRCURY LNA miRNA Power Inhibitors allows them to be used at low concentrations, minimizing the risk of undesired secondary effects unrelated to the antisense activity.
Predesigned miRCURY LNA miRNA Inhibitors and miRCURY LNA miRNA Power Inhibitors have been designed for all known human, mouse and rat miRNAs. Since many miRNAs are phylogenetically conserved, this set of inhibitors covers a large proportion of vertebrate and invertebrate miRNAs. These inhibitors are also available with fluorescein (6-FAM) labels. All miRNA inhibitors are desalted and delivered dried down in tubes in 1 nmol, 5 nmol and 15 nmol quantities.
Predesigned negative controls
We currently offer four predesigned negative controls, two for use with miRCURY LNA miRNA Inhibitors and two for use with miRCURY LNA miRNA Power Inhibitors. The miRCURY LNA miRNA Power Inhibitor Controls have phosphorothioate-modified backbones to match the miRCURY LNA miRNA Power Inhibitors.
miRCURY LNA miRNA Inhibitors are desalted and delivered dried down in tubes. Following resuspension, regular inhibitors can be delivered to cells with a transfection reagent or by electroporation. Alternatively, Power Inhibitors can be added directly to the cell culture medium for unassisted uptake via gymnosis. Phenotypic effects of the miRNA inhibitor are normally assessed 24–72 hours after delivery. For some applications, such as cell differentiation assays, the phenotypic readout may take place 7–10 days after transfection.
miRCURY LNA miRNA Inhibitors are primarily used for miRNA loss-of-function studies by assessing the biological consequences of inhibiting miRNA activity. These effects can be observed in a variety of ways, including using cellular assays to monitor cell proliferation, cell differentiation or apoptosis. Changes to gene expression of putative miRNA targets can also be measured at the mRNA or protein level.
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